Introducing Bootloader Development Kit (BDK)

BDK will allow developers to use the full collection of drivers,
with limited editing, if any, for making payloads for Nintendo Switch.

Using a single source for everything will also help decoupling
Switch specific code and easily port it to other Tegra X1/X1+ platforms.
And maybe even to lower targets.

Everything is now centrilized into bdk folder.
Every module or project can utilize it by simply including it.

This is just the start and it will continue to improve.

bdk/libs/lvgl/lv_draw/lv_draw.c

@@ -0,0 +1,163 @@
+/**
+ * @file lv_draw.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+#include <stdio.h>
+#include "lv_draw.h"
+#include "lv_draw_rbasic.h"
+#include "lv_draw_vbasic.h"
+#include "../lv_misc/lv_fs.h"
+#include "../lv_misc/lv_math.h"
+#include "../lv_misc/lv_ufs.h"
+#include "../lv_objx/lv_img.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+#if LV_VDB_SIZE != 0
+void (*const px_fp)(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) = lv_vpx;
+void (*const fill_fp)(const lv_area_t * coords, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) =  lv_vfill;
+void (*const letter_fp)(const lv_point_t * pos_p, const lv_area_t * mask, const lv_font_t * font_p, uint32_t letter, lv_color_t color, lv_opa_t opa) = lv_vletter;
+void (*const map_fp)(const lv_area_t * cords_p, const lv_area_t * mask_p,
+                     const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
+                     lv_color_t recolor, lv_opa_t recolor_opa) = lv_vmap;
+#else
+void (*const px_fp)(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) = lv_rpx;
+void (*const fill_fp)(const lv_area_t * coords, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) =  lv_rfill;
+void (*const letter_fp)(const lv_point_t * pos_p, const lv_area_t * mask, const lv_font_t * font_p, uint32_t letter, lv_color_t color, lv_opa_t opa) = lv_rletter;
+void (*const map_fp)(const lv_area_t * cords_p, const lv_area_t * mask_p,
+                     const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
+                     lv_color_t recolor, lv_opa_t recolor_opa) = lv_rmap;
+#endif
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+#if LV_ANTIALIAS != 0
+
+/**
+ * Get the opacity of a pixel based it's position in a line segment
+ * @param seg segment length
+ * @param px_id position of  of a pixel which opacity should be get [0..seg-1]
+ * @param base_opa the base opacity
+ * @return the opacity of the given pixel
+ */
+lv_opa_t lv_draw_aa_get_opa(lv_coord_t seg, lv_coord_t px_id, lv_opa_t base_opa)
+{
+    /* How to calculate the opacity of pixels on the edges which makes the anti-aliasing?
+     * For example we have a line like this (y = -0.5 * x):
+     *
+     *  | _ _
+     *    * * |
+     *
+     * Anti-aliased pixels come to the '*' characters
+     * Calculate what percentage of the pixels should be covered if real line (not rasterized) would be drawn:
+     * 1. A real line should start on (0;0) and end on (2;1)
+     * 2. So the line intersection coordinates on the first pixel: (0;0) (1;0.5) -> 25% covered pixel in average
+     * 3. For the second pixel: (1;0.5) (2;1) -> 75% covered pixel in average
+     * 4. The equation: (px_id * 2 + 1) / (segment_width * 2)
+     *                   segment_width: the line segment which is being anti-aliased (was 2 in the example)
+     *                   px_id: pixel ID from 0 to  (segment_width - 1)
+     *                   result: [0..1] coverage of the pixel
+     */
+
+    /*Accelerate the common segment sizes to avoid division*/
+    static const  lv_opa_t seg1[1] = {128};
+    static const  lv_opa_t seg2[2] = {64, 192};
+    static const  lv_opa_t seg3[3] = {42, 128, 212};
+    static const  lv_opa_t seg4[4] = {32, 96, 159, 223};
+    static const  lv_opa_t seg5[5] = {26,  76, 128, 178, 230};
+    static const  lv_opa_t seg6[6] = {21,  64, 106, 148, 191, 234};
+    static const  lv_opa_t seg7[7] = {18,  55, 91, 128, 164, 200, 237};
+    static const  lv_opa_t seg8[8] = {16,  48, 80, 112, 143, 175, 207, 239};
+
+    static const lv_opa_t * seg_map[] = {seg1, seg2, seg3, seg4,
+                                         seg5, seg6, seg7, seg8
+                                        };
+
+    if(seg == 0) return LV_OPA_TRANSP;
+    else if(seg < 8) return (uint32_t)((uint32_t)seg_map[seg - 1][px_id] * base_opa) >> 8;
+    else {
+        return ((px_id * 2 + 1) * base_opa) / (2 * seg);
+    }
+
+}
+
+/**
+ * Add a vertical  anti-aliasing segment (pixels with decreasing opacity)
+ * @param x start point x coordinate
+ * @param y start point y coordinate
+ * @param length length of segment (negative value to start from 0 opacity)
+ * @param mask draw only in this area
+ * @param color color of pixels
+ * @param opa maximum opacity
+ */
+void lv_draw_aa_ver_seg(lv_coord_t x, lv_coord_t y, lv_coord_t length, const lv_area_t * mask, lv_color_t color, lv_opa_t opa)
+{
+    bool aa_inv = false;
+    if(length < 0) {
+        aa_inv = true;
+        length = -length;
+    }
+
+    lv_coord_t i;
+    for(i = 0; i < length; i++) {
+        lv_opa_t px_opa = lv_draw_aa_get_opa(length, i, opa);
+        if(aa_inv) px_opa = opa - px_opa;
+        px_fp(x, y + i, mask, color, px_opa);
+    }
+}
+
+/**
+ * Add a horizontal anti-aliasing segment (pixels with decreasing opacity)
+ * @param x start point x coordinate
+ * @param y start point y coordinate
+ * @param length length of segment (negative value to start from 0 opacity)
+ * @param mask draw only in this area
+ * @param color color of pixels
+ * @param opa maximum opacity
+ */
+void lv_draw_aa_hor_seg(lv_coord_t x, lv_coord_t y, lv_coord_t length, const lv_area_t * mask, lv_color_t color, lv_opa_t opa)
+{
+    bool aa_inv = false;
+    if(length < 0) {
+        aa_inv = true;
+        length = -length;
+    }
+
+    lv_coord_t i;
+    for(i = 0; i < length; i++) {
+        lv_opa_t px_opa = lv_draw_aa_get_opa(length, i, opa);
+        if(aa_inv) px_opa = opa - px_opa;
+        px_fp(x + i, y, mask, color, px_opa);
+    }
+}
+
+#endif

bdk/libs/lvgl/lv_draw/lv_draw.h

@@ -0,0 +1,115 @@
+/**
+ * @file lv_draw.h
+ *
+ */
+
+#ifndef LV_DRAW_H
+#define LV_DRAW_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#ifdef LV_CONF_INCLUDE_SIMPLE
+#include "lv_conf.h"
+#else
+#include "../../lv_conf.h"
+#endif
+
+#include "../lv_core/lv_style.h"
+#include "../lv_misc/lv_txt.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+/*If image pixels contains alpha we need to know how much byte is a pixel*/
+#if LV_COLOR_DEPTH == 1 || LV_COLOR_DEPTH == 8
+# define LV_IMG_PX_SIZE_ALPHA_BYTE   2
+#elif LV_COLOR_DEPTH == 16
+# define LV_IMG_PX_SIZE_ALPHA_BYTE   3
+#elif LV_COLOR_DEPTH == 32
+# define LV_IMG_PX_SIZE_ALPHA_BYTE   4
+#endif
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+enum {
+    LV_IMG_SRC_VARIABLE,
+    LV_IMG_SRC_FILE,
+    LV_IMG_SRC_SYMBOL,
+    LV_IMG_SRC_UNKNOWN,
+};
+typedef uint8_t lv_img_src_t;
+
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+#if LV_ANTIALIAS != 0
+
+/**
+ * Get the opacity of a pixel based it's position in a line segment
+ * @param seg segment length
+ * @param px_id position of  of a pixel which opacity should be get [0..seg-1]
+ * @param base_opa the base opacity
+ * @return the opacity of the given pixel
+ */
+lv_opa_t lv_draw_aa_get_opa(lv_coord_t seg, lv_coord_t px_id, lv_opa_t base_opa);
+
+/**
+ * Add a vertical  anti-aliasing segment (pixels with decreasing opacity)
+ * @param x start point x coordinate
+ * @param y start point y coordinate
+ * @param length length of segment (negative value to start from 0 opacity)
+ * @param mask draw only in this area
+ * @param color color of pixels
+ * @param opa maximum opacity
+ */
+void lv_draw_aa_ver_seg(lv_coord_t x, lv_coord_t y, lv_coord_t length, const lv_area_t * mask, lv_color_t color, lv_opa_t opa);
+
+/**
+ * Add a horizontal anti-aliasing segment (pixels with decreasing opacity)
+ * @param x start point x coordinate
+ * @param y start point y coordinate
+ * @param length length of segment (negative value to start from 0 opacity)
+ * @param mask draw only in this area
+ * @param color color of pixels
+ * @param opa maximum opacity
+ */
+void lv_draw_aa_hor_seg(lv_coord_t x, lv_coord_t y, lv_coord_t length, const lv_area_t * mask, lv_color_t color, lv_opa_t opa);
+#endif
+
+/**********************
+ *  GLOBAL VARIABLES
+ **********************/
+extern void (*const px_fp)(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_color_t color, lv_opa_t opa);
+extern void (*const fill_fp)(const lv_area_t * coords, const lv_area_t * mask, lv_color_t color, lv_opa_t opa);
+extern void (*const letter_fp)(const lv_point_t * pos_p, const lv_area_t * mask, const lv_font_t * font_p, uint32_t letter, lv_color_t color, lv_opa_t opa);
+extern void (*const map_fp)(const lv_area_t * cords_p, const lv_area_t * mask_p,
+                            const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
+                            lv_color_t recolor, lv_opa_t recolor_opa);
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   POST INCLUDES
+ *********************/
+#include "lv_draw_rect.h"
+#include "lv_draw_label.h"
+#include "lv_draw_img.h"
+#include "lv_draw_line.h"
+#include "lv_draw_triangle.h"
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif  /*LV_DRAW_H*/

bdk/libs/lvgl/lv_draw/lv_draw.mk

@@ -0,0 +1,14 @@
+CSRCS += lv_draw_vbasic.c
+CSRCS += lv_draw_rbasic.c
+CSRCS += lv_draw.c
+CSRCS += lv_draw_rect.c
+CSRCS += lv_draw_label.c
+CSRCS += lv_draw_line.c
+CSRCS += lv_draw_img.c
+CSRCS += lv_draw_arc.c
+CSRCS += lv_draw_triangle.c
+
+DEPPATH += --dep-path $(LVGL_DIR)/lvgl/lv_draw
+VPATH += :$(LVGL_DIR)/lvgl/lv_draw
+
+CFLAGS += "-I$(LVGL_DIR)/lvgl/lv_draw"

bdk/libs/lvgl/lv_draw/lv_draw_arc.c

@@ -0,0 +1,264 @@
+/**
+ * @file lv_draw_arc.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw_arc.h"
+#include "../lv_misc/lv_math.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static uint16_t fast_atan2(int x, int y);
+static void ver_line(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_coord_t len, lv_color_t color, lv_opa_t opa);
+static void hor_line(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_coord_t len, lv_color_t color, lv_opa_t opa);
+static bool deg_test_norm(uint16_t deg, uint16_t start, uint16_t end);
+static bool deg_test_inv(uint16_t deg, uint16_t start, uint16_t end);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Draw an arc. (Can draw pie too with great thickness.)
+ * @param center_x the x coordinate of the center of the arc
+ * @param center_y the y coordinate of the center of the arc
+ * @param radius the radius of the arc
+ * @param mask the arc will be drawn only in this mask
+ * @param start_angle the start angle of the arc (0 deg on the bottom, 90 deg on the right)
+ * @param end_angle the end angle of the arc
+ * @param style style of the arc (`body.thickness`, `body.main_color`, `body.opa` is used)
+ * @param opa_scale scale down all opacities by the factor
+ */
+void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius, const lv_area_t * mask,
+                 uint16_t start_angle, uint16_t end_angle, const lv_style_t * style, lv_opa_t opa_scale)
+{
+    lv_coord_t thickness = style->line.width;
+    if(thickness > radius) thickness = radius;
+
+    lv_coord_t r_out = radius;
+    lv_coord_t r_in = r_out - thickness;
+    int16_t deg_base;
+    int16_t deg;
+    lv_coord_t x_start[4];
+    lv_coord_t x_end[4];
+
+    lv_color_t color = style->line.color;
+    lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->body.opa : (uint16_t)((uint16_t) style->body.opa * opa_scale) >> 8;
+
+
+    bool (*deg_test)(uint16_t, uint16_t, uint16_t);
+    if(start_angle <= end_angle) deg_test = deg_test_norm;
+    else deg_test = deg_test_inv;
+
+    if(deg_test(270, start_angle, end_angle))  hor_line(center_x - r_out + 1, center_y, mask, thickness - 1, color, opa);   // Left Middle
+    if(deg_test(90, start_angle, end_angle))   hor_line(center_x + r_in, center_y,  mask, thickness - 1, color, opa);       // Right Middle
+    if(deg_test(180, start_angle, end_angle))  ver_line(center_x, center_y - r_out + 1,  mask, thickness - 1, color, opa);  // Top Middle
+    if(deg_test(0, start_angle, end_angle))    ver_line(center_x, center_y + r_in,  mask, thickness - 1, color, opa);       // Bottom middle
+
+    uint32_t r_out_sqr = r_out * r_out;
+    uint32_t r_in_sqr = r_in * r_in;
+    int16_t xi;
+    int16_t yi;
+    for(yi = -r_out; yi < 0; yi++) {
+        x_start[0] = LV_COORD_MIN;
+        x_start[1] = LV_COORD_MIN;
+        x_start[2] = LV_COORD_MIN;
+        x_start[3] = LV_COORD_MIN;
+        x_end[0] = LV_COORD_MIN;
+        x_end[1] = LV_COORD_MIN;
+        x_end[2] = LV_COORD_MIN;
+        x_end[3] = LV_COORD_MIN;
+        for(xi = -r_out; xi < 0; xi++) {
+
+            uint32_t r_act_sqr = xi * xi + yi * yi;
+            if(r_act_sqr > r_out_sqr) continue;
+
+            deg_base =  fast_atan2(xi, yi) - 180;
+
+            deg = 180 + deg_base;
+            if(deg_test(deg, start_angle, end_angle)) {
+                if(x_start[0] == LV_COORD_MIN) x_start[0] = xi;
+            } else if(x_start[0] != LV_COORD_MIN && x_end[0] == LV_COORD_MIN) {
+                x_end[0] = xi - 1;
+            }
+
+            deg = 360 - deg_base;
+            if(deg_test(deg, start_angle, end_angle)) {
+                if(x_start[1] == LV_COORD_MIN) x_start[1] = xi;
+            } else if(x_start[1] != LV_COORD_MIN && x_end[1] == LV_COORD_MIN) {
+                x_end[1] = xi - 1;
+            }
+
+            deg = 180 - deg_base;
+            if(deg_test(deg, start_angle, end_angle)) {
+                if(x_start[2] == LV_COORD_MIN) x_start[2] = xi;
+            } else if(x_start[2] != LV_COORD_MIN && x_end[2] == LV_COORD_MIN) {
+                x_end[2] = xi - 1;
+            }
+
+            deg = deg_base;
+            if(deg_test(deg, start_angle, end_angle)) {
+                if(x_start[3] == LV_COORD_MIN) x_start[3] = xi;
+            } else if(x_start[3] != LV_COORD_MIN && x_end[3] == LV_COORD_MIN) {
+                x_end[3] = xi - 1;
+            }
+
+            if(r_act_sqr < r_in_sqr) break; /*No need to continue the iteration in x once we found the inner edge of the arc*/
+        }
+
+
+        if(x_start[0] != LV_COORD_MIN) {
+            if(x_end[0] == LV_COORD_MIN) x_end[0] = xi - 1;
+            hor_line(center_x + x_start[0], center_y + yi, mask, x_end[0] - x_start[0], color, opa);
+        }
+
+        if(x_start[1] != LV_COORD_MIN) {
+            if(x_end[1] == LV_COORD_MIN) x_end[1] = xi - 1;
+            hor_line(center_x + x_start[1], center_y - yi, mask, x_end[1] - x_start[1], color, opa);
+        }
+
+        if(x_start[2] != LV_COORD_MIN) {
+            if(x_end[2] == LV_COORD_MIN) x_end[2] = xi - 1;
+            hor_line(center_x - x_end[2], center_y + yi, mask, LV_MATH_ABS(x_end[2] - x_start[2]), color, opa);
+        }
+
+        if(x_start[3] != LV_COORD_MIN) {
+            if(x_end[3] == LV_COORD_MIN) x_end[3] = xi - 1;
+            hor_line(center_x - x_end[3], center_y - yi, mask, LV_MATH_ABS(x_end[3] - x_start[3]), color, opa);
+        }
+
+
+#if LV_ANTIALIAS
+        /*TODO*/
+
+#endif
+
+    }
+}
+
+static uint16_t fast_atan2(int x, int y)
+{
+    // Fast XY vector to integer degree algorithm - Jan 2011 www.RomanBlack.com
+    // Converts any XY values including 0 to a degree value that should be
+    // within +/- 1 degree of the accurate value without needing
+    // large slow trig functions like ArcTan() or ArcCos().
+    // NOTE! at least one of the X or Y values must be non-zero!
+    // This is the full version, for all 4 quadrants and will generate
+    // the angle in integer degrees from 0-360.
+    // Any values of X and Y are usable including negative values provided
+    // they are between -1456 and 1456 so the 16bit multiply does not overflow.
+
+    unsigned char negflag;
+    unsigned char tempdegree;
+    unsigned char comp;
+    unsigned int degree;     // this will hold the result
+    //signed int x;            // these hold the XY vector at the start
+    //signed int y;            // (and they will be destroyed)
+    unsigned int ux;
+    unsigned int uy;
+
+    // Save the sign flags then remove signs and get XY as unsigned ints
+    negflag = 0;
+    if(x < 0) {
+        negflag += 0x01;    // x flag bit
+        x = (0 - x);        // is now +
+    }
+    ux = x;                // copy to unsigned var before multiply
+    if(y < 0) {
+        negflag += 0x02;    // y flag bit
+        y = (0 - y);        // is now +
+    }
+    uy = y;                // copy to unsigned var before multiply
+
+    // 1. Calc the scaled "degrees"
+    if(ux > uy) {
+        degree = (uy * 45) / ux;   // degree result will be 0-45 range
+        negflag += 0x10;    // octant flag bit
+    } else {
+        degree = (ux * 45) / uy;   // degree result will be 0-45 range
+    }
+
+    // 2. Compensate for the 4 degree error curve
+    comp = 0;
+    tempdegree = degree;    // use an unsigned char for speed!
+    if(tempdegree > 22) {    // if top half of range
+        if(tempdegree <= 44) comp++;
+        if(tempdegree <= 41) comp++;
+        if(tempdegree <= 37) comp++;
+        if(tempdegree <= 32) comp++;  // max is 4 degrees compensated
+    } else { // else is lower half of range
+        if(tempdegree >= 2) comp++;
+        if(tempdegree >= 6) comp++;
+        if(tempdegree >= 10) comp++;
+        if(tempdegree >= 15) comp++;  // max is 4 degrees compensated
+    }
+    degree += comp;   // degree is now accurate to +/- 1 degree!
+
+    // Invert degree if it was X>Y octant, makes 0-45 into 90-45
+    if(negflag & 0x10) degree = (90 - degree);
+
+    // 3. Degree is now 0-90 range for this quadrant,
+    // need to invert it for whichever quadrant it was in
+    if(negflag & 0x02) { // if -Y
+        if(negflag & 0x01)   // if -Y -X
+            degree = (180 + degree);
+        else        // else is -Y +X
+            degree = (180 - degree);
+    } else { // else is +Y
+        if(negflag & 0x01)   // if +Y -X
+            degree = (360 - degree);
+    }
+    return degree;
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+static void ver_line(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_coord_t len, lv_color_t color, lv_opa_t opa)
+{
+    lv_area_t area;
+    lv_area_set(&area, x, y, x, y + len);
+
+    fill_fp(&area, mask, color, opa);
+}
+
+static void hor_line(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_coord_t len, lv_color_t color, lv_opa_t opa)
+{
+    lv_area_t area;
+    lv_area_set(&area, x, y, x + len, y);
+
+    fill_fp(&area, mask, color, opa);
+}
+
+static bool deg_test_norm(uint16_t deg, uint16_t start, uint16_t end)
+{
+    if(deg >= start && deg <= end) return true;
+    else return false;
+}
+
+static bool deg_test_inv(uint16_t deg, uint16_t start, uint16_t end)
+{
+    if(deg >= start || deg <= end) {
+        return true;
+    } else return false;
+}

bdk/libs/lvgl/lv_draw/lv_draw_arc.h

@@ -0,0 +1,53 @@
+/**
+ * @file lv_draw_arc.h
+ *
+ */
+
+#ifndef LV_DRAW_ARC_H
+#define LV_DRAW_ARC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Draw an arc. (Can draw pie too with great thickness.)
+ * @param center_x the x coordinate of the center of the arc
+ * @param center_y the y coordinate of the center of the arc
+ * @param radius the radius of the arc
+ * @param mask the arc will be drawn only in this mask
+ * @param start_angle the start angle of the arc (0 deg on the bottom, 90 deg on the right)
+ * @param end_angle the end angle of the arc
+ * @param style style of the arc (`body.thickness`, `body.main_color`, `body.opa` is used)
+ * @param opa_scale scale down all opacities by the factor
+ */
+void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius, const lv_area_t * mask,
+                 uint16_t start_angle, uint16_t end_angle, const lv_style_t * style, lv_opa_t opa_scale);
+
+/**********************
+ *      MACROS
+ **********************/
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_DRAW_ARC*/

bdk/libs/lvgl/lv_draw/lv_draw_img.c

@@ -0,0 +1,759 @@
+/**
+ * @file lv_draw_img.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw_img.h"
+#include "../lv_misc/lv_fs.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static lv_res_t lv_img_draw_core(const lv_area_t * coords, const lv_area_t * mask,
+                                 const void * src, const lv_style_t * style, lv_opa_t opa_scale);
+
+static const uint8_t * lv_img_decoder_open(const void * src, const lv_style_t * style);
+static lv_res_t lv_img_decoder_read_line(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf);
+static void lv_img_decoder_close(void);
+static lv_res_t lv_img_built_in_decoder_line_alpha(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf);
+static lv_res_t lv_img_built_in_decoder_line_indexed(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+static bool decoder_custom;
+static const void * decoder_src;
+static lv_img_src_t decoder_src_type;
+static lv_img_header_t decoder_header;
+static const lv_style_t * decoder_style;
+#if USE_LV_FILESYSTEM
+static lv_fs_file_t decoder_file;
+#endif
+#if LV_IMG_CF_INDEXED
+static lv_color_t decoder_index_map[256];
+#endif
+
+static lv_img_decoder_info_f_t lv_img_decoder_info_custom;
+static lv_img_decoder_open_f_t lv_img_decoder_open_custom;
+static lv_img_decoder_read_line_f_t lv_img_decoder_read_line_custom;
+static lv_img_decoder_close_f_t lv_img_decoder_close_custom;
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Draw an image
+ * @param coords the coordinates of the image
+ * @param mask the image will be drawn only in this area
+ * @param src pointer to a lv_color_t array which contains the pixels of the image
+ * @param style style of the image
+ * @param opa_scale scale down all opacities by the factor
+ */
+void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask,
+                 const void * src, const lv_style_t * style, lv_opa_t opa_scale)
+{
+    if(src == NULL) {
+        LV_LOG_WARN("Image draw: src is NULL");
+        lv_draw_rect(coords, mask, &lv_style_plain, LV_OPA_COVER);
+        lv_draw_label(coords, mask, &lv_style_plain, LV_OPA_COVER, "No\ndata", LV_TXT_FLAG_NONE, NULL);
+        return;
+    }
+
+    lv_res_t res;
+    res = lv_img_draw_core(coords, mask, src, style, opa_scale);
+
+    if(res ==  LV_RES_INV) {
+        LV_LOG_WARN("Image draw error");
+        lv_draw_rect(coords, mask, &lv_style_plain, LV_OPA_COVER);
+        lv_draw_label(coords, mask, &lv_style_plain, LV_OPA_COVER, "No\ndata", LV_TXT_FLAG_NONE, NULL);
+        return;
+    }
+}
+
+
+/**
+ *
+ * @param src
+ * @param header
+ * @param style
+ * @return
+ */
+lv_res_t lv_img_dsc_get_info(const char * src, lv_img_header_t * header)
+{
+    header->always_zero = 0;
+    /*Try to get info with the custom functions first*/
+    if(lv_img_decoder_info_custom) {
+        lv_res_t custom_res;
+        custom_res = lv_img_decoder_info_custom(src, header);
+        if(custom_res == LV_RES_OK) return LV_RES_OK;       /*Custom info has supported this source*/
+    }
+
+    lv_img_src_t src_type = lv_img_src_get_type(src);
+    if(src_type == LV_IMG_SRC_VARIABLE) {
+        header->w = ((lv_img_dsc_t *)src)->header.w;
+        header->h = ((lv_img_dsc_t *)src)->header.h;
+        header->cf = ((lv_img_dsc_t *)src)->header.cf;
+    }
+#if USE_LV_FILESYSTEM
+    else if(src_type == LV_IMG_SRC_FILE) {
+        lv_fs_file_t file;
+        lv_fs_res_t res;
+        uint32_t rn;
+        res = lv_fs_open(&file, src, LV_FS_MODE_RD);
+        if(res == LV_FS_RES_OK) {
+            res = lv_fs_read(&file, header, sizeof(lv_img_header_t), &rn);
+        }
+
+        /*Create a dummy header on fs error*/
+        if(res != LV_FS_RES_OK || rn != sizeof(lv_img_header_t)) {
+            header->w = LV_DPI;
+            header->h = LV_DPI;
+            header->cf = LV_IMG_CF_UNKOWN;
+        }
+
+        lv_fs_close(&file);
+    }
+#endif
+    else if(src_type == LV_IMG_SRC_SYMBOL) {
+        /*The size depend on the font but it is unknown here. It should be handled outside of the function*/
+        header->w = 1;
+        header->h = 1;
+        /* Symbols always have transparent parts. Important because of cover check in the design function.
+         * The actual value doesn't matter because lv_draw_label will draw it*/
+        header->cf  = LV_IMG_CF_ALPHA_1BIT;
+    } else {
+        LV_LOG_WARN("Image get info found unknown src type");
+        return false;
+    }
+    return true;
+
+}
+
+uint8_t lv_img_color_format_get_px_size(lv_img_cf_t cf)
+{
+    uint8_t px_size = 0;
+
+    switch(cf) {
+        case LV_IMG_CF_UNKOWN:
+        case LV_IMG_CF_RAW:
+            px_size = 0;
+            break;
+        case LV_IMG_CF_TRUE_COLOR:
+        case LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED:
+            px_size = LV_COLOR_SIZE;
+            break;
+        case LV_IMG_CF_TRUE_COLOR_ALPHA:
+            px_size = LV_IMG_PX_SIZE_ALPHA_BYTE << 3;
+            break;
+        case LV_IMG_CF_INDEXED_1BIT:
+        case LV_IMG_CF_ALPHA_1BIT:
+            px_size = 1;
+            break;
+        case LV_IMG_CF_INDEXED_2BIT:
+        case LV_IMG_CF_ALPHA_2BIT:
+            px_size = 2;
+            break;
+        case LV_IMG_CF_INDEXED_4BIT:
+        case LV_IMG_CF_ALPHA_4BIT:
+            px_size = 4;
+            break;
+        case LV_IMG_CF_INDEXED_8BIT:
+        case LV_IMG_CF_ALPHA_8BIT:
+            px_size = 8;
+            break;
+        default:
+            px_size = 0;
+            break;
+    }
+
+    return px_size;
+}
+
+bool lv_img_color_format_is_chroma_keyed(lv_img_cf_t cf)
+{
+    bool is_chroma_keyed = false;
+
+    switch(cf) {
+        case LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED:
+        case LV_IMG_CF_RAW_CHROMA_KEYED:
+        case LV_IMG_CF_INDEXED_1BIT:
+        case LV_IMG_CF_INDEXED_2BIT:
+        case LV_IMG_CF_INDEXED_4BIT:
+        case LV_IMG_CF_INDEXED_8BIT:
+            is_chroma_keyed = true;
+            break;
+        default:
+            is_chroma_keyed = false;
+            break;
+    }
+
+    return is_chroma_keyed;
+}
+
+
+bool lv_img_color_format_has_alpha(lv_img_cf_t cf)
+{
+    bool has_alpha = false;
+
+    switch(cf) {
+        case LV_IMG_CF_TRUE_COLOR_ALPHA:
+        case LV_IMG_CF_RAW_ALPHA:
+        case LV_IMG_CF_ALPHA_1BIT:
+        case LV_IMG_CF_ALPHA_2BIT:
+        case LV_IMG_CF_ALPHA_4BIT:
+        case LV_IMG_CF_ALPHA_8BIT:
+            has_alpha = true;
+            break;
+        default:
+            has_alpha = false;
+            break;
+    }
+
+    return has_alpha;
+}
+
+/**
+ * Get the type of an image source
+ * @param src pointer to an image source:
+ *  - pointer to an 'lv_img_t' variable (image stored internally and compiled into the code)
+ *  - a path to a file (e.g. "S:/folder/image.bin")
+ *  - or a symbol (e.g. SYMBOL_CLOSE)
+ * @return type of the image source LV_IMG_SRC_VARIABLE/FILE/SYMBOL/UNKOWN
+ */
+lv_img_src_t lv_img_src_get_type(const void * src)
+{
+    lv_img_src_t img_src_type = LV_IMG_SRC_UNKNOWN;
+
+    if(src == NULL) return img_src_type;
+    const uint8_t * u8_p = src;
+
+    /*The first byte shows the type of the image source*/
+    if(u8_p[0] >= 0x20 && u8_p[0] <= 0x7F) {
+        img_src_type = LV_IMG_SRC_FILE;     /*If it's an ASCII character then it's file name*/
+    } else if(u8_p[0] >= 0x80) {
+        img_src_type = LV_IMG_SRC_SYMBOL;   /*Symbols begins after 0x7F*/
+    } else {
+        img_src_type = LV_IMG_SRC_VARIABLE; /*`lv_img_dsc_t` is design to the first byte < 0x20*/
+    }
+
+    if (LV_IMG_SRC_UNKNOWN == img_src_type) {
+        LV_LOG_WARN("lv_img_src_get_type: unknown image type");
+    }
+
+    return img_src_type;
+}
+
+/**
+ * Set custom decoder functions. See the typdefs of the function typed above for more info about them
+ * @param info_fp info get function
+ * @param open_fp open function
+ * @param read_fp read line function
+ * @param close_fp clode function
+ */
+void lv_img_decoder_set_custom(lv_img_decoder_info_f_t  info_fp, lv_img_decoder_open_f_t  open_fp,
+                               lv_img_decoder_read_line_f_t read_fp, lv_img_decoder_close_f_t close_fp)
+{
+    lv_img_decoder_info_custom = info_fp;
+    lv_img_decoder_open_custom = open_fp;
+    lv_img_decoder_read_line_custom = read_fp;
+    lv_img_decoder_close_custom = close_fp;
+}
+
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+
+static lv_res_t lv_img_draw_core(const lv_area_t * coords, const lv_area_t * mask,
+                                 const void * src, const lv_style_t * style, lv_opa_t opa_scale)
+{
+
+    lv_area_t mask_com;    /*Common area of mask and coords*/
+    bool union_ok;
+    union_ok = lv_area_intersect(&mask_com, mask, coords);
+    if(union_ok == false) {
+        return LV_RES_OK;         /*Out of mask. There is nothing to draw so the image is drawn successfully.*/
+    }
+
+    lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->image.opa : (uint16_t)((uint16_t) style->image.opa * opa_scale) >> 8;
+
+    lv_img_header_t header;
+    lv_res_t header_res;
+    header_res = lv_img_dsc_get_info(src, &header);
+    if(header_res != LV_RES_OK) {
+        LV_LOG_WARN("Image draw can't get image info");
+        lv_img_decoder_close();
+        return LV_RES_INV;
+    }
+
+    bool chroma_keyed = lv_img_color_format_is_chroma_keyed(header.cf);
+    bool alpha_byte = lv_img_color_format_has_alpha(header.cf);
+
+    const uint8_t * img_data = lv_img_decoder_open(src, style);
+    if(img_data == LV_IMG_DECODER_OPEN_FAIL) {
+        LV_LOG_WARN("Image draw cannot open the image resource");
+        lv_img_decoder_close();
+        return LV_RES_INV;
+    }
+
+    /* The decoder open could open the image and gave the entire uncompressed image.
+     * Just draw it!*/
+    if(img_data) {
+        map_fp(coords, mask, img_data, opa, chroma_keyed, alpha_byte, style->image.color, style->image.intense);
+    }
+    /* The whole uncompressed image is not available. Try to read it line-by-line*/
+    else {
+        lv_coord_t width = lv_area_get_width(&mask_com);
+
+#if LV_COMPILER_VLA_SUPPORTED
+        uint8_t buf[(lv_area_get_width(&mask_com) * ((LV_COLOR_DEPTH >> 3) + 1))];
+#else
+        uint8_t buf[LV_HOR_RES * ((LV_COLOR_DEPTH >> 3) + 1)];  /*+1 because of the possible alpha byte*/
+#endif
+        lv_area_t line;
+        lv_area_copy(&line, &mask_com);
+        lv_area_set_height(&line, 1);
+        lv_coord_t x = mask_com.x1 - coords->x1;
+        lv_coord_t y = mask_com.y1 - coords->y1;
+        lv_coord_t row;
+        lv_res_t read_res;
+        for(row = mask_com.y1; row <= mask_com.y2; row++) {
+            read_res = lv_img_decoder_read_line(x, y, width, buf);
+            if(read_res != LV_RES_OK) {
+                lv_img_decoder_close();
+                LV_LOG_WARN("Image draw can't read the line");
+                return LV_RES_INV;
+            }
+            map_fp(&line, mask, buf, opa, chroma_keyed, alpha_byte, style->image.color, style->image.intense);
+            line.y1++;
+            line.y2++;
+            y++;
+        }
+    }
+
+    lv_img_decoder_close();
+
+    return LV_RES_OK;
+}
+
+
+static const uint8_t * lv_img_decoder_open(const void * src, const lv_style_t * style)
+{
+    decoder_custom = false;
+
+    /*Try to open with the custom functions first*/
+    if(lv_img_decoder_open_custom) {
+        const uint8_t * custom_res;
+        custom_res = lv_img_decoder_open_custom(src, style);
+        if(custom_res != LV_IMG_DECODER_OPEN_FAIL) {
+            decoder_custom = true;  /*Mark that custom decoder function should be used for this img source.*/
+            return custom_res;      /*Custom open supported this source*/
+        }
+    }
+
+    decoder_src = src;
+    decoder_style = style;
+    decoder_src_type = lv_img_src_get_type(src);
+
+    lv_res_t header_res;
+    header_res = lv_img_dsc_get_info(src, &decoder_header);
+    if(header_res == LV_RES_INV) {
+        decoder_src = NULL;
+        decoder_src_type = LV_IMG_SRC_UNKNOWN;
+        LV_LOG_WARN("Built-in image decoder can't get the header info");
+        return LV_IMG_DECODER_OPEN_FAIL;
+    }
+
+    /*Open the file if it's a file*/
+    if(decoder_src_type == LV_IMG_SRC_FILE) {
+#if USE_LV_FILESYSTEM
+        lv_fs_res_t res = lv_fs_open(&decoder_file, src, LV_FS_MODE_RD);
+        if(res != LV_FS_RES_OK) {
+            LV_LOG_WARN("Built-in image decoder can't open the file");
+            return LV_IMG_DECODER_OPEN_FAIL;
+        }
+#else
+        LV_LOG_WARN("Image built-in decoder can read file because USE_LV_FILESYSTEM = 0");
+        return LV_IMG_DECODER_OPEN_FAIL;
+#endif
+    }
+
+
+    /*Process the different color formats*/
+    lv_img_cf_t cf = decoder_header.cf;
+    if(cf == LV_IMG_CF_TRUE_COLOR ||
+            cf == LV_IMG_CF_TRUE_COLOR_ALPHA ||
+            cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED) {
+        if(decoder_src_type == LV_IMG_SRC_VARIABLE) {
+            /*In case of uncompressed formats if the image stored in the ROM/RAM simply give it's pointer*/
+            return ((lv_img_dsc_t *)decoder_src)->data;
+        } else {
+            /*If it's file it need to be read line by line later*/
+            return NULL;
+        }
+    } else if(cf == LV_IMG_CF_INDEXED_1BIT ||
+              cf == LV_IMG_CF_INDEXED_2BIT ||
+              cf == LV_IMG_CF_INDEXED_4BIT ||
+              cf == LV_IMG_CF_INDEXED_8BIT) {
+
+#if LV_IMG_CF_INDEXED
+#if USE_LV_FILESYSTEM
+        lv_color32_t palette_file[256];
+#endif
+
+        lv_color32_t * palette_p = NULL;
+        uint8_t px_size = lv_img_color_format_get_px_size(cf);
+        uint32_t palette_size = 1 << px_size;
+
+        if(decoder_src_type == LV_IMG_SRC_FILE) {
+            /*Read the palette from file*/
+#if USE_LV_FILESYSTEM
+            lv_fs_seek(&decoder_file, 4);   /*Skip the header*/
+            lv_fs_read(&decoder_file, palette_file, palette_size * sizeof(lv_color32_t), NULL);
+            palette_p = palette_file;
+#else
+            LV_LOG_WARN("Image built-in decoder can read the palette because USE_LV_FILESYSTEM = 0");
+            return LV_IMG_DECODER_OPEN_FAIL;
+#endif
+        } else {
+            /*The palette begins in the beginning of the image data. Just point to it.*/
+            palette_p = (lv_color32_t *)((lv_img_dsc_t *)decoder_src)->data;
+        }
+
+        uint32_t i;
+        for(i = 0; i < palette_size; i++) {
+            decoder_index_map[i] = LV_COLOR_MAKE(palette_p[i].red, palette_p[i].green, palette_p[i].blue);
+        }
+        return NULL;
+#else
+        LV_LOG_WARN("Indexed (palette) images are not enabled in lv_conf.h. See LV_IMG_CF_INDEXED");
+        return LV_IMG_DECODER_OPEN_FAIL;
+#endif
+    } else if(cf == LV_IMG_CF_ALPHA_1BIT ||
+              cf == LV_IMG_CF_ALPHA_2BIT ||
+              cf == LV_IMG_CF_ALPHA_4BIT ||
+              cf == LV_IMG_CF_ALPHA_8BIT) {
+#if LV_IMG_CF_ALPHA
+        return NULL;   /*Nothing to process*/
+#else
+        LV_LOG_WARN("Alpha indexed images are not enabled in lv_conf.h. See LV_IMG_CF_ALPHA");
+        return LV_IMG_DECODER_OPEN_FAIL;
+#endif
+    } else {
+        LV_LOG_WARN("Image decoder open: unknown color format")
+        return LV_IMG_DECODER_OPEN_FAIL;
+    }
+}
+
+
+static lv_res_t lv_img_decoder_read_line(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf)
+{
+    /*Try to read the line with the custom functions*/
+    if(decoder_custom) {
+        if(lv_img_decoder_read_line_custom) {
+            lv_res_t custom_res;
+            custom_res = lv_img_decoder_read_line_custom(x, y, len, buf);
+            return custom_res;
+        } else {
+            LV_LOG_WARN("Image open with custom decoder but read not supported")
+        }
+        return LV_RES_INV;  /*It"s an error if not returned earlier*/
+    }
+
+    if(decoder_src_type == LV_IMG_SRC_FILE) {
+#if USE_LV_FILESYSTEM
+        uint8_t px_size = lv_img_color_format_get_px_size(decoder_header.cf);
+
+        lv_fs_res_t res;
+
+        if(decoder_header.cf == LV_IMG_CF_TRUE_COLOR ||
+                decoder_header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA ||
+                decoder_header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED) {
+            uint32_t pos = ((y * decoder_header.w + x) * px_size) >> 3;
+            pos += 4;    /*Skip the header*/
+            res = lv_fs_seek(&decoder_file, pos);
+            if(res != LV_FS_RES_OK) {
+                LV_LOG_WARN("Built-in image decoder seek failed");
+                return false;
+            }
+            uint32_t btr = len * (px_size >> 3);
+            uint32_t br = 0;
+            lv_fs_read(&decoder_file, buf, btr, &br);
+            if(res != LV_FS_RES_OK || btr != br) {
+                LV_LOG_WARN("Built-in image decoder read failed");
+                return false;
+            }
+        } else if(decoder_header.cf == LV_IMG_CF_ALPHA_1BIT ||
+                  decoder_header.cf == LV_IMG_CF_ALPHA_2BIT ||
+                  decoder_header.cf == LV_IMG_CF_ALPHA_4BIT ||
+                  decoder_header.cf == LV_IMG_CF_ALPHA_8BIT) {
+
+            lv_img_built_in_decoder_line_alpha(x, y, len, buf);
+        } else if(decoder_header.cf == LV_IMG_CF_INDEXED_1BIT ||
+                  decoder_header.cf == LV_IMG_CF_INDEXED_2BIT ||
+                  decoder_header.cf == LV_IMG_CF_INDEXED_4BIT ||
+                  decoder_header.cf == LV_IMG_CF_INDEXED_8BIT) {
+            lv_img_built_in_decoder_line_indexed(x, y, len, buf);
+        } else {
+            LV_LOG_WARN("Built-in image decoder read not supports the color format");
+            return false;
+        }
+#else
+        LV_LOG_WARN("Image built-in decoder can't read file because USE_LV_FILESYSTEM = 0");
+        return false;
+#endif
+    } else if(decoder_src_type == LV_IMG_SRC_VARIABLE) {
+        const lv_img_dsc_t * img_dsc = decoder_src;
+
+        if(img_dsc->header.cf == LV_IMG_CF_ALPHA_1BIT ||
+                img_dsc->header.cf == LV_IMG_CF_ALPHA_2BIT ||
+                img_dsc->header.cf == LV_IMG_CF_ALPHA_4BIT ||
+                img_dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) {
+            lv_img_built_in_decoder_line_alpha(x, y, len, buf);
+        } else if(img_dsc->header.cf == LV_IMG_CF_INDEXED_1BIT ||
+                  img_dsc->header.cf == LV_IMG_CF_INDEXED_2BIT ||
+                  img_dsc->header.cf == LV_IMG_CF_INDEXED_4BIT ||
+                  img_dsc->header.cf == LV_IMG_CF_INDEXED_8BIT) {
+            lv_img_built_in_decoder_line_indexed(x, y, len, buf);
+        } else {
+            LV_LOG_WARN("Built-in image decoder not supports the color format");
+            return false;
+        }
+    }
+
+    return true;
+}
+
+static void lv_img_decoder_close(void)
+{
+    /*Try to close with the custom functions*/
+    if(decoder_custom) {
+        if(lv_img_decoder_close_custom) lv_img_decoder_close_custom();
+        return;
+    }
+
+    /*It was opened with built-in decoder*/
+    if(decoder_src) {
+#if USE_LV_FILESYSTEM
+        if(decoder_src_type == LV_IMG_SRC_FILE) {
+            lv_fs_close(&decoder_file);
+        }
+#endif
+        decoder_src_type = LV_IMG_SRC_UNKNOWN;
+        decoder_src = NULL;
+    }
+}
+
+static lv_res_t lv_img_built_in_decoder_line_alpha(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf)
+{
+
+#if LV_IMG_CF_ALPHA
+    const lv_opa_t alpha1_opa_table[2] =  {0, 255};                   /*Opacity mapping with bpp = 1 (Just for compatibility)*/
+    const lv_opa_t alpha2_opa_table[4] =  {0, 85, 170, 255};          /*Opacity mapping with bpp = 2*/
+    const lv_opa_t alpha4_opa_table[16] = {0,   17,  34,  51,         /*Opacity mapping with bpp = 4*/
+                                           68,  85,  102, 119,
+                                           136, 153, 170, 187,
+                                           204, 221, 238, 255
+                                          };
+
+    /*Simply fill the buffer with the color. Later only the alpha value will be modified.*/
+    lv_color_t bg_color = decoder_style->image.color;
+    lv_coord_t i;
+    for(i = 0; i < len; i++) {
+#if LV_COLOR_DEPTH == 8 || LV_COLOR_DEPTH == 1
+        buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE] = bg_color.full;
+#elif LV_COLOR_DEPTH == 16
+        /*Because of Alpha byte 16 bit color can start on odd address which can cause crash*/
+        buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE] = bg_color.full & 0xFF;
+        buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE + 1] = (bg_color.full >> 8) & 0xFF;
+#elif LV_COLOR_DEPTH == 32
+        *((uint32_t *)&buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE]) = bg_color.full;
+#else
+#error "Invalid LV_COLOR_DEPTH. Check it in lv_conf.h"
+#endif
+    }
+
+    const lv_opa_t * opa_table = NULL;
+    uint8_t px_size = lv_img_color_format_get_px_size(decoder_header.cf);
+    uint16_t mask = (1 << px_size) - 1; /*E.g. px_size = 2; mask = 0x03*/
+
+    lv_coord_t w = 0;
+    uint32_t ofs = 0;
+    int8_t pos = 0;
+    switch(decoder_header.cf) {
+        case LV_IMG_CF_ALPHA_1BIT:
+            w = (decoder_header.w >> 3);        /*E.g. w = 20 -> w = 2 + 1*/
+            if(decoder_header.w & 0x7) w++;
+            ofs += w * y + (x >> 3);      /*First pixel*/
+            pos = 7 - (x & 0x7);
+            opa_table = alpha1_opa_table;
+            break;
+        case LV_IMG_CF_ALPHA_2BIT:
+            w = (decoder_header.w >> 2);       /*E.g. w = 13 -> w = 3 + 1 (bytes)*/
+            if(decoder_header.w & 0x3) w++;
+            ofs += w * y + (x >> 2);      /*First pixel*/
+            pos = 6 - ((x & 0x3) * 2);
+            opa_table = alpha2_opa_table;
+            break;
+        case LV_IMG_CF_ALPHA_4BIT:
+            w = (decoder_header.w >> 1);       /*E.g. w = 13 -> w = 6 + 1 (bytes)*/
+            if(decoder_header.w & 0x1) w++;
+            ofs += w * y + (x >> 1);      /*First pixel*/
+            pos = 4 - ((x & 0x1) * 4);
+            opa_table = alpha4_opa_table;
+            break;
+        case LV_IMG_CF_ALPHA_8BIT:
+            w = decoder_header.w;              /*E.g. x = 7 -> w = 7 (bytes)*/
+            ofs += w * y + x;      /*First pixel*/
+            pos = 0;
+            break;
+    }
+
+#if USE_LV_FILESYSTEM
+# if LV_COMPILER_VLA_SUPPORTED
+    uint8_t fs_buf[w];
+# else
+    uint8_t fs_buf[LV_HOR_RES];
+# endif
+#endif
+    const uint8_t * data_tmp = NULL;
+    if(decoder_src_type == LV_IMG_SRC_VARIABLE) {
+        const lv_img_dsc_t * img_dsc = decoder_src;
+        data_tmp = img_dsc->data + ofs;
+    } else {
+#if USE_LV_FILESYSTEM
+        lv_fs_seek(&decoder_file, ofs + 4);     /*+4 to skip the header*/
+        lv_fs_read(&decoder_file, fs_buf, w, NULL);
+        data_tmp = fs_buf;
+#else
+        LV_LOG_WARN("Image built-in alpha line reader can't read file because USE_LV_FILESYSTEM = 0");
+        data_tmp = NULL;        /*To avoid warnings*/
+        return LV_RES_INV;
+#endif
+    }
+
+
+    uint8_t byte_act = 0;
+    uint8_t val_act;
+    for(i = 0; i < len; i ++) {
+        val_act = (data_tmp[byte_act] & (mask << pos)) >> pos;
+
+        buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE + LV_IMG_PX_SIZE_ALPHA_BYTE - 1] =
+            decoder_header.cf == LV_IMG_CF_ALPHA_8BIT ? val_act : opa_table[val_act];
+
+        pos -= px_size;
+        if(pos < 0) {
+            pos = 8 - px_size;
+            data_tmp++;
+        }
+    }
+
+    return LV_RES_OK;
+
+#else
+    LV_LOG_WARN("Image built-in alpha line reader failed because LV_IMG_CF_ALPHA is 0 in lv_conf.h");
+    return LV_RES_INV;
+#endif
+}
+
+static lv_res_t lv_img_built_in_decoder_line_indexed(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf)
+{
+
+#if LV_IMG_CF_INDEXED
+    uint8_t px_size = lv_img_color_format_get_px_size(decoder_header.cf);
+    uint16_t mask = (1 << px_size) - 1; /*E.g. px_size = 2; mask = 0x03*/
+
+    lv_coord_t w = 0;
+    int8_t pos = 0;
+    uint32_t ofs = 0;
+    switch(decoder_header.cf) {
+        case LV_IMG_CF_INDEXED_1BIT:
+            w = (decoder_header.w >> 3);       /*E.g. w = 20 -> w = 2 + 1*/
+            if(decoder_header.w & 0x7) w++;
+            ofs += w * y + (x >> 3);      /*First pixel*/
+            ofs += 8;                    /*Skip the palette*/
+            pos = 7 - (x & 0x7);
+            break;
+        case LV_IMG_CF_INDEXED_2BIT:
+            w = (decoder_header.w >> 2);       /*E.g. w = 13 -> w = 3 + 1 (bytes)*/
+            if(decoder_header.w & 0x3) w++;
+            ofs += w * y + (x >> 2);      /*First pixel*/
+            ofs += 16;                    /*Skip the palette*/
+            pos = 6 - ((x & 0x3) * 2);
+            break;
+        case LV_IMG_CF_INDEXED_4BIT:
+            w = (decoder_header.w >> 1);       /*E.g. w = 13 -> w = 6 + 1 (bytes)*/
+            if(decoder_header.w & 0x1) w++;
+            ofs += w * y + (x >> 1);      /*First pixel*/
+            ofs += 64;                    /*Skip the palette*/
+            pos = 4 - ((x & 0x1) * 4);
+            break;
+        case LV_IMG_CF_INDEXED_8BIT:
+            w = decoder_header.w;              /*E.g. x = 7 -> w = 7 (bytes)*/
+            ofs += w * y + x;              /*First pixel*/
+            ofs += 1024;                    /*Skip the palette*/
+            pos = 0;
+            break;
+    }
+
+#if USE_LV_FILESYSTEM
+# if LV_COMPILER_VLA_SUPPORTED
+    uint8_t fs_buf[w];
+# else
+    uint8_t fs_buf[LV_HOR_RES];
+# endif
+#endif
+    const uint8_t * data_tmp = NULL;
+    if(decoder_src_type == LV_IMG_SRC_VARIABLE) {
+        const lv_img_dsc_t * img_dsc = decoder_src;
+        data_tmp = img_dsc->data + ofs;
+    } else {
+#if USE_LV_FILESYSTEM
+        lv_fs_seek(&decoder_file, ofs + 4);     /*+4 to skip the header*/
+        lv_fs_read(&decoder_file, fs_buf, w, NULL);
+        data_tmp = fs_buf;
+#else
+        LV_LOG_WARN("Image built-in indexed line reader can't read file because USE_LV_FILESYSTEM = 0");
+        data_tmp = NULL;        /*To avoid warnings*/
+        return LV_RES_INV;
+#endif
+    }
+
+    uint8_t byte_act = 0;
+    uint8_t val_act;
+    lv_coord_t i;
+    lv_color_t * cbuf = (lv_color_t *) buf;
+    for(i = 0; i < len; i ++) {
+        val_act = (data_tmp[byte_act] & (mask << pos)) >> pos;
+        cbuf[i] = decoder_index_map[val_act];
+
+        pos -= px_size;
+        if(pos < 0) {
+            pos = 8 - px_size;
+            data_tmp++;
+        }
+    }
+
+    return LV_RES_OK;
+#else
+    LV_LOG_WARN("Image built-in indexed line reader failed because LV_IMG_CF_INDEXED is 0 in lv_conf.h");
+    return LV_RES_INV;
+#endif
+}

bdk/libs/lvgl/lv_draw/lv_draw_img.h

@@ -0,0 +1,167 @@
+/**
+ * @file lv_draw_img.h
+ *
+ */
+
+#ifndef LV_DRAW_IMG_H
+#define LV_DRAW_IMG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw.h"
+#include "../lv_core/lv_obj.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+#define LV_IMG_DECODER_OPEN_FAIL    ((void*)(-1))
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+struct _lv_img_t;
+
+typedef struct {
+
+    /* The first 8 bit is very important to distinguish the different source types.
+     * For more info see `lv_img_get_src_type()` in lv_img.c */
+    uint32_t cf           :5;    /* Color format: See `lv_img_color_format_t`*/
+    uint32_t always_zero  :3;    /*It the upper bits of the first byte. Always zero to look like a non-printable character*/
+
+    uint32_t reserved     :2;   /*Reserved to be used later*/
+
+    uint32_t w:11;              /*Width of the image map*/
+    uint32_t h:11;              /*Height of the image map*/
+} lv_img_header_t;
+
+/*Image color format*/
+enum {
+    LV_IMG_CF_UNKOWN = 0,
+
+    LV_IMG_CF_RAW,                  /*Contains the file as it is. Needs custom decoder function*/
+    LV_IMG_CF_RAW_ALPHA,            /*Contains the file as it is. The image has alpha. Needs custom decoder function*/
+    LV_IMG_CF_RAW_CHROMA_KEYED,     /*Contains the file as it is. The image is chroma keyed. Needs custom decoder function*/
+
+    LV_IMG_CF_TRUE_COLOR,           /*Color format and depth should match with LV_COLOR settings*/
+    LV_IMG_CF_TRUE_COLOR_ALPHA,     /*Same as `LV_IMG_CF_TRUE_COLOR` but every pixel has an alpha byte*/
+    LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED,  /*Same as `LV_IMG_CF_TRUE_COLOR` but LV_COLOR_TRANSP pixels will be transparent*/
+
+    LV_IMG_CF_INDEXED_1BIT,         /*Can have 2 different colors in a palette (always chroma keyed)*/
+    LV_IMG_CF_INDEXED_2BIT,         /*Can have 4 different colors in a palette (always chroma keyed)*/
+    LV_IMG_CF_INDEXED_4BIT,         /*Can have 16 different colors in a palette (always chroma keyed)*/
+    LV_IMG_CF_INDEXED_8BIT,         /*Can have 256 different colors in a palette (always chroma keyed)*/
+
+    LV_IMG_CF_ALPHA_1BIT,           /*Can have one color and it can be drawn or not*/
+    LV_IMG_CF_ALPHA_2BIT,           /*Can have one color but 4 different alpha value*/
+    LV_IMG_CF_ALPHA_4BIT,           /*Can have one color but 16 different alpha value*/
+    LV_IMG_CF_ALPHA_8BIT,           /*Can have one color but 256 different alpha value*/
+};
+typedef uint8_t lv_img_cf_t;
+
+/* Image header it is compatible with
+ * the result image converter utility*/
+typedef struct
+{
+    lv_img_header_t header;
+    uint32_t data_size;
+    const uint8_t * data;
+} lv_img_dsc_t;
+
+/* Decoder function definitions */
+
+
+/**
+ * Get info from an image and store in the `header`
+ * @param src the image source. Can be a pointer to a C array or a file name (Use `lv_img_src_get_type` to determine the type)
+ * @param header store the info here
+ * @return LV_RES_OK: info written correctly; LV_RES_INV: failed
+ */
+typedef lv_res_t (*lv_img_decoder_info_f_t)(const void * src, lv_img_header_t * header);
+
+/**
+ * Open an image for decoding. Prepare it as it is required to read it later
+ * @param src the image source. Can be a pointer to a C array or a file name (Use `lv_img_src_get_type` to determine the type)
+ * @param style the style of image (maybe it will be required to determine a color or something)
+ * @return there are 3 possible return values:
+ *    1) buffer with the decoded image
+ *    2) if can decode the whole image NULL. decoder_read_line will be called to read the image line-by-line
+ *    3) LV_IMG_DECODER_OPEN_FAIL if the image format is unknown to the decoder or an error occurred
+ */
+typedef const uint8_t * (*lv_img_decoder_open_f_t)(const void * src, const lv_style_t * style);
+
+/**
+ * Decode `len` pixels starting from the given `x`, `y` coordinates and store them in `buf`.
+ * Required only if the "open" function can't return with the whole decoded pixel array.
+ * @param x start x coordinate
+ * @param y startt y coordinate
+ * @param len number of pixels to decode
+ * @param buf a buffer to store the decoded pixels
+ * @return LV_RES_OK: ok; LV_RES_INV: failed
+ */
+typedef lv_res_t (*lv_img_decoder_read_line_f_t)(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf);
+
+/**
+ * Close the pending decoding. Free resources etc.
+ */
+typedef void (*lv_img_decoder_close_f_t)(void);
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Draw an image
+ * @param coords the coordinates of the image
+ * @param mask the image will be drawn only in this area
+ * @param src pointer to a lv_color_t array which contains the pixels of the image
+ * @param style style of the image
+ * @param opa_scale scale down all opacities by the factor
+ */
+void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask,
+                 const void * src, const lv_style_t * style, lv_opa_t opa_scale);
+
+
+/**
+ * Get the type of an image source
+ * @param src pointer to an image source:
+ *  - pointer to an 'lv_img_t' variable (image stored internally and compiled into the code)
+ *  - a path to a file (e.g. "S:/folder/image.bin")
+ *  - or a symbol (e.g. SYMBOL_CLOSE)
+ * @return type of the image source LV_IMG_SRC_VARIABLE/FILE/SYMBOL/UNKOWN
+ */
+lv_img_src_t lv_img_src_get_type(const void * src);
+
+/**
+ * Set custom decoder functions. See the typdefs of the function typed above for more info about them
+ * @param info_fp info get function
+ * @param open_fp open function
+ * @param read_fp read line function
+ * @param close_fp clode function
+ */
+void lv_img_decoder_set_custom(lv_img_decoder_info_f_t  info_fp, lv_img_decoder_open_f_t  open_fp,
+                               lv_img_decoder_read_line_f_t read_fp, lv_img_decoder_close_f_t close_fp);
+
+lv_res_t lv_img_dsc_get_info(const char * src, lv_img_header_t * header);
+
+uint8_t lv_img_color_format_get_px_size(lv_img_cf_t cf);
+
+bool lv_img_color_format_is_chroma_keyed(lv_img_cf_t cf);
+
+bool lv_img_color_format_has_alpha(lv_img_cf_t cf);
+
+
+/**********************
+ *      MACROS
+ **********************/
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_TEMPL_H*/

bdk/libs/lvgl/lv_draw/lv_draw_label.c

@@ -0,0 +1,264 @@
+/**
+ * @file lv_draw_label.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw_label.h"
+#include "lv_draw_rbasic.h"
+#include "../lv_misc/lv_math.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+#define LABEL_RECOLOR_PAR_LENGTH    6
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+enum {
+    CMD_STATE_WAIT,
+    CMD_STATE_PAR,
+    CMD_STATE_IN,
+};
+typedef uint8_t cmd_state_t;
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static uint8_t hex_char_to_num(char hex);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Write a text
+ * @param coords coordinates of the label
+ * @param mask the label will be drawn only in this area
+ * @param style pointer to a style
+ * @param opa_scale scale down all opacities by the factor
+ * @param txt 0 terminated text to write
+ * @param flag settings for the text from 'txt_flag_t' enum
+ * @param offset text offset in x and y direction (NULL if unused)
+ *
+ */
+void lv_draw_label(const lv_area_t * coords, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale,
+                   const char * txt, lv_txt_flag_t flag, lv_point_t * offset)
+{
+    const lv_font_t * font = style->text.font;
+    lv_coord_t w;
+    if((flag & LV_TXT_FLAG_EXPAND) == 0) {
+        /*Normally use the label's width as width*/
+        w = lv_area_get_width(coords);
+    } else {
+        /*If EXAPND is enabled then not limit the text's width to the object's width*/
+        lv_point_t p;
+        lv_txt_get_size(&p, txt, style->text.font, style->text.letter_space, style->text.line_space, LV_COORD_MAX, flag);
+        w = p.x;
+    }
+
+    lv_coord_t line_height = lv_font_get_height(font) + style->text.line_space;
+
+
+    /*Init variables for the first line*/
+    lv_coord_t line_width = 0;
+    lv_point_t pos;
+    pos.x = coords->x1;
+    pos.y = coords->y1;
+
+    lv_coord_t x_ofs = 0;
+    lv_coord_t y_ofs = 0;
+    if(offset != NULL) {
+        x_ofs = offset->x;
+        y_ofs = offset->y;
+        pos.y += y_ofs;
+    }
+
+    uint32_t line_start = 0;
+    uint32_t line_end = lv_txt_get_next_line(txt, font, style->text.letter_space, w, flag);
+
+    /*Go the first visible line*/
+    while(pos.y + line_height < mask->y1) {
+        /*Go to next line*/
+        line_start = line_end;
+        line_end += lv_txt_get_next_line(&txt[line_start], font, style->text.letter_space, w, flag);
+        pos.y += line_height;
+
+        if(txt[line_start] == '\0') return;
+    }
+
+    /*Align to middle*/
+    if(flag & LV_TXT_FLAG_CENTER) {
+        line_width = lv_txt_get_width(&txt[line_start], line_end - line_start,
+                                      font, style->text.letter_space, flag);
+
+        pos.x += (lv_area_get_width(coords) - line_width) / 2;
+
+    }
+    /*Align to the right*/
+    else if(flag & LV_TXT_FLAG_RIGHT) {
+        line_width = lv_txt_get_width(&txt[line_start], line_end - line_start,
+                                      font, style->text.letter_space, flag);
+        pos.x += lv_area_get_width(coords) - line_width;
+    }
+
+
+    lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->text.opa : (uint16_t)((uint16_t) style->text.opa * opa_scale) >> 8;
+
+    cmd_state_t cmd_state = CMD_STATE_WAIT;
+    uint32_t i;
+    uint16_t par_start = 0;
+    lv_color_t recolor;
+    lv_coord_t letter_w;
+
+    /*Real draw need a background color for higher bpp letter*/
+#if LV_VDB_SIZE == 0
+    lv_rletter_set_background(style->body.main_color);
+#endif
+
+
+    /*Write out all lines*/
+    while(txt[line_start] != '\0') {
+        if(offset != NULL) {
+            pos.x += x_ofs;
+        }
+        /*Write all letter of a line*/
+        cmd_state = CMD_STATE_WAIT;
+        i = line_start;
+        uint32_t letter;
+        while(i < line_end) {
+            letter = lv_txt_encoded_next(txt, &i);
+
+            /*Handle the re-color command*/
+            if((flag & LV_TXT_FLAG_RECOLOR) != 0) {
+                if(letter == (uint32_t)LV_TXT_COLOR_CMD[0]) {
+                    if(cmd_state == CMD_STATE_WAIT) { /*Start char*/
+                        par_start = i;
+                        cmd_state = CMD_STATE_PAR;
+                        continue;
+                    } else if(cmd_state == CMD_STATE_PAR) { /*Other start char in parameter escaped cmd. char */
+                        cmd_state = CMD_STATE_WAIT;
+                    } else if(cmd_state == CMD_STATE_IN) { /*Command end */
+                        cmd_state = CMD_STATE_WAIT;
+                        continue;
+                    }
+                }
+
+                /*Skip the color parameter and wait the space after it*/
+                if(cmd_state == CMD_STATE_PAR) {
+                    if(letter == ' ') {
+                        /*Get the parameter*/
+                        if(i - par_start == LABEL_RECOLOR_PAR_LENGTH + 1) {
+                            char buf[LABEL_RECOLOR_PAR_LENGTH + 1];
+                            memcpy(buf, &txt[par_start], LABEL_RECOLOR_PAR_LENGTH);
+                            buf[LABEL_RECOLOR_PAR_LENGTH] = '\0';
+                            int r, g, b;
+                            r = (hex_char_to_num(buf[0]) << 4) + hex_char_to_num(buf[1]);
+                            g = (hex_char_to_num(buf[2]) << 4) + hex_char_to_num(buf[3]);
+                            b = (hex_char_to_num(buf[4]) << 4) + hex_char_to_num(buf[5]);
+                            recolor = LV_COLOR_MAKE(r, g, b);
+                        } else {
+                            recolor.full = style->text.color.full;
+                        }
+                        cmd_state = CMD_STATE_IN; /*After the parameter the text is in the command*/
+                    }
+                    continue;
+                }
+            }
+
+            lv_color_t color = style->text.color;
+
+            if(cmd_state == CMD_STATE_IN) color = recolor;
+
+            letter_fp(&pos, mask, font, letter, color, opa);
+            letter_w = lv_font_get_width(font, letter);
+
+            if(letter_w > 0){
+                pos.x += letter_w + style->text.letter_space;
+            }
+        }
+        /*Go to next line*/
+        line_start = line_end;
+        line_end += lv_txt_get_next_line(&txt[line_start], font, style->text.letter_space, w, flag);
+
+        pos.x = coords->x1;
+        /*Align to middle*/
+        if(flag & LV_TXT_FLAG_CENTER) {
+            line_width = lv_txt_get_width(&txt[line_start], line_end - line_start,
+                                          font, style->text.letter_space, flag);
+
+            pos.x += (lv_area_get_width(coords) - line_width) / 2;
+
+        }
+        /*Align to the right*/
+        else if(flag & LV_TXT_FLAG_RIGHT) {
+            line_width = lv_txt_get_width(&txt[line_start], line_end - line_start,
+                                          font, style->text.letter_space, flag);
+            pos.x += lv_area_get_width(coords) - line_width;
+        }
+
+        /*Go the next line position*/
+        pos.y += line_height;
+
+        if(pos.y > mask->y2) return;
+    }
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+/**
+ * Convert a hexadecimal characters to a number (0..15)
+ * @param hex Pointer to a hexadecimal character (0..9, A..F)
+ * @return the numerical value of `hex` or 0 on error
+ */
+static uint8_t hex_char_to_num(char hex)
+{
+    uint8_t result = 0;
+
+    if(hex >= '0' && hex <= '9') {
+        result = hex - '0';
+    }
+    else {
+        if(hex >= 'a') hex -= 'a' - 'A';    /*Convert to upper case*/
+
+        switch(hex) {
+            case 'A':
+                result = 10;
+                break;
+            case 'B':
+                result = 11;
+                break;
+            case 'C':
+                result = 12;
+                break;
+            case 'D':
+                result = 13;
+                break;
+            case 'E':
+                result = 14;
+                break;
+            case 'F':
+                result = 15;
+                break;
+            default:
+                result = 0;
+                break;
+        }
+    }
+
+    return result;
+}

bdk/libs/lvgl/lv_draw/lv_draw_label.h

@@ -0,0 +1,53 @@
+/**
+ * @file lv_draw_label.h
+ *
+ */
+
+#ifndef LV_DRAW_LABEL_H
+#define LV_DRAW_LABEL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Write a text
+ * @param coords coordinates of the label
+ * @param mask the label will be drawn only in this area
+ * @param style pointer to a style
+ * @param opa_scale scale down all opacities by the factor
+ * @param txt 0 terminated text to write
+ * @param flag settings for the text from 'txt_flag_t' enum
+ * @param offset text offset in x and y direction (NULL if unused)
+ *
+ */
+void lv_draw_label(const lv_area_t * coords,const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale,
+                   const char * txt, lv_txt_flag_t flag, lv_point_t * offset);
+
+/**********************
+ *      MACROS
+ **********************/
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_DRAW_LABEL_H*/

bdk/libs/lvgl/lv_draw/lv_draw_line.c

@@ -0,0 +1,607 @@
+/**
+ * @file lv_draw_line.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include <stdio.h>
+#include "lv_draw.h"
+#include "../lv_misc/lv_math.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+#if LV_COMPILER_VLA_SUPPORTED == 0
+#define LINE_MAX_WIDTH        64
+#endif
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+typedef struct {
+    lv_point_t p1;
+    lv_point_t p2;
+    lv_point_t p_act;
+    lv_coord_t dx;
+    lv_coord_t sx;      /*-1: x1 < x2; 1: x2 >= x1*/
+    lv_coord_t dy;
+    lv_coord_t sy;      /*-1: y1 < y2; 1: y2 >= y1*/
+    lv_coord_t err;
+    lv_coord_t e2;
+    bool hor;   /*Rather horizontal or vertical*/
+} line_draw_t;
+
+typedef struct {
+    lv_coord_t width;
+    lv_coord_t width_1;
+    lv_coord_t width_half;
+} line_width_t;
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static void line_draw_hor(line_draw_t * main_line, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale);
+static void line_draw_ver(line_draw_t * main_line, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale);
+static void line_draw_skew(line_draw_t * main_line, bool dir_ori, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale);
+static void line_init(line_draw_t * line, const lv_point_t * p1, const lv_point_t * p2);
+static bool line_next(line_draw_t * line);
+static bool line_next_y(line_draw_t * line);
+static bool line_next_x(line_draw_t * line);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Draw a line
+ * @param point1 first point of the line
+ * @param point2 second point of the line
+ * @param mask the line will be drawn only on this area
+ * @param style pointer to a line's style
+ * @param opa_scale scale down all opacities by the factor
+ */
+void lv_draw_line(const lv_point_t * point1, const lv_point_t * point2, const lv_area_t * mask,
+        const lv_style_t * style, lv_opa_t opa_scale)
+{
+
+    if(style->line.width == 0) return;
+    if(point1->x == point2->x && point1->y == point2->y) return;
+
+    line_draw_t main_line;
+    lv_point_t p1;
+    lv_point_t p2;
+
+    /*If the line if rather vertical then be sure y1 < y2 else x1 < x2*/
+
+    if(LV_MATH_ABS(point1->x - point2->x) > LV_MATH_ABS(point1->y - point2->y)) {
+
+        /*Steps less in y then x -> rather horizontal*/
+        if(point1->x < point2->x) {
+            p1.x = point1->x;
+            p1.y = point1->y;
+            p2.x = point2->x;
+            p2.y = point2->y;
+        } else {
+            p1.x = point2->x;
+            p1.y = point2->y;
+            p2.x = point1->x;
+            p2.y = point1->y;
+        }
+    } else {
+        /*Steps less in x then y -> rather vertical*/
+        if(point1->y < point2->y) {
+            p1.x = point1->x;
+            p1.y = point1->y;
+            p2.x = point2->x;
+            p2.y = point2->y;
+        } else {
+            p1.x = point2->x;
+            p1.y = point2->y;
+            p2.x = point1->x;
+            p2.y = point1->y;
+        }
+    }
+
+    line_init(&main_line, &p1, &p2);
+
+
+    /*Special case draw a horizontal line*/
+    if(main_line.p1.y == main_line.p2.y) {
+        line_draw_hor(&main_line, mask, style, opa_scale);
+    }
+    /*Special case draw a vertical line*/
+    else if(main_line.p1.x == main_line.p2.x) {
+        line_draw_ver(&main_line, mask, style, opa_scale);
+    }
+    /*Arbitrary skew line*/
+    else {
+        bool dir_ori = false;
+#if LV_ANTIALIAS
+        lv_point_t p_tmp;
+
+        if(main_line.hor) {
+            if(main_line.p1.y < main_line.p2.y) {
+                dir_ori = true;
+                p_tmp.x = main_line.p2.x;
+                p_tmp.y = main_line.p2.y - 1;
+                line_init(&main_line, &p1, &p_tmp);
+                main_line.sy = LV_MATH_ABS(main_line.sy);   /*The sign can change if the line becomes horizontal*/
+            }
+            else if(main_line.p1.y > main_line.p2.y) {
+                dir_ori = false;
+                p_tmp.x = main_line.p2.x;
+                p_tmp.y = main_line.p2.y + 1;
+                line_init(&main_line, &p1, &p_tmp);
+                main_line.sy = -LV_MATH_ABS(main_line.sy);  /*The sign can change if the line becomes horizontal*/
+            }
+        }
+        else {
+            if(main_line.p1.x < main_line.p2.x) {
+                dir_ori = true;
+                p_tmp.x = main_line.p2.x - 1;
+                p_tmp.y = main_line.p2.y;
+                line_init(&main_line, &p1, &p_tmp);
+                main_line.sx = LV_MATH_ABS(main_line.sx);   /*The sign can change if the line becomes vertical*/
+            }
+            else if(main_line.p1.x > main_line.p2.x) {
+                dir_ori = false;
+                p_tmp.x = main_line.p2.x + 1;
+                p_tmp.y = main_line.p2.y;
+                line_init(&main_line, &p1, &p_tmp);
+                main_line.sx = -LV_MATH_ABS(main_line.sx);  /*The sign can change if the line becomes vertical*/
+            }
+        }
+#endif
+        line_draw_skew(&main_line, dir_ori, mask, style, opa_scale);
+    }
+}
+
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+
+static void line_draw_hor(line_draw_t * main_line, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale)
+{
+    lv_coord_t width = style->line.width - 1;
+    lv_coord_t width_half = width >> 1;
+    lv_coord_t width_1 = width & 0x1;
+    lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->line.opa : (uint16_t)((uint16_t) style->line.opa * opa_scale) >> 8;
+
+    lv_area_t act_area;
+    act_area.x1 = main_line->p1.x;
+    act_area.x2 = main_line->p2.x;
+    act_area.y1 = main_line->p1.y - width_half - width_1;
+    act_area.y2 = main_line->p2.y + width_half ;
+
+    lv_area_t draw_area;
+    draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2);
+    draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2);
+    draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2);
+    draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2);
+    fill_fp(&draw_area, mask, style->line.color, opa);
+}
+
+static void line_draw_ver(line_draw_t * main_line, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale)
+{
+    lv_coord_t width = style->line.width - 1;
+    lv_coord_t width_half = width >> 1;
+    lv_coord_t width_1 = width & 0x1;
+    lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->line.opa : (uint16_t)((uint16_t) style->line.opa * opa_scale) >> 8;
+
+
+    lv_area_t act_area;
+    act_area.x1 = main_line->p1.x - width_half;
+    act_area.x2 = main_line->p2.x + width_half + width_1;
+    act_area.y1 = main_line->p1.y;
+    act_area.y2 = main_line->p2.y;
+
+    lv_area_t draw_area;
+    draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2);
+    draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2);
+    draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2);
+    draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2);
+    fill_fp(&draw_area, mask, style->line.color, opa);
+}
+
+static void line_draw_skew(line_draw_t * main_line, bool dir_ori, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale)
+{
+
+    lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->line.opa : (uint16_t)((uint16_t) style->line.opa * opa_scale) >> 8;
+
+    lv_point_t vect_main, vect_norm;
+    vect_main.x = main_line->p2.x - main_line->p1.x;
+    vect_main.y = main_line->p2.y - main_line->p1.y;
+
+    if(main_line->hor) {
+        if(main_line->p1.y < main_line->p2.y + dir_ori) {
+            vect_norm.x = - vect_main.y;
+            vect_norm.y = vect_main.x;
+        } else {
+            vect_norm.x = vect_main.y;
+            vect_norm.y = -vect_main.x;
+        }
+    } else {
+        if(main_line->p1.x < main_line->p2.x + dir_ori) {
+            vect_norm.x = vect_main.y;
+            vect_norm.y = - vect_main.x;
+        } else {
+            vect_norm.x = - vect_main.y;
+            vect_norm.y = vect_main.x;
+        }
+    }
+
+    /* In case of a short but tick line the perpendicular ending is longer then the real line.
+     * it would break the calculations so make the normal vector larger*/
+    vect_norm.x = vect_norm.x << 4;
+    vect_norm.y = vect_norm.y << 4;
+
+    lv_coord_t width;
+    width = style->line.width;
+
+    /* The pattern stores the points of the line ending. It has the good direction and length.
+     * The worth case is the 45° line where pattern can have 1.41 x `width` points*/
+#if LV_COMPILER_VLA_SUPPORTED
+    lv_point_t pattern[width * 2];
+#else
+    lv_point_t pattern[LINE_MAX_WIDTH];
+#endif
+    lv_coord_t i = 0;
+
+    /*Create a perpendicular pattern (a small line)*/
+    if(width != 0) {
+        line_draw_t pattern_line;
+        lv_point_t p0 = {0, 0};
+        line_init(&pattern_line, &p0, &vect_norm);
+
+        uint32_t width_sqr = width * width;
+        /* Run for a lot of times. Meanwhile the real width will be determined as well */
+        for(i = 0; i < (lv_coord_t)sizeof(pattern); i ++) {
+            pattern[i].x = pattern_line.p_act.x;
+            pattern[i].y = pattern_line.p_act.y;
+
+            /*Finish the pattern line if it's length equal to the desired width (Use Pythagoras theorem)*/
+            uint32_t  sqr = pattern_line.p_act.x * pattern_line.p_act.x + pattern_line.p_act.y * pattern_line.p_act.y;
+            if(sqr >= width_sqr) {
+                width = i;
+#if LV_ANTIALIAS
+                width--;
+#endif
+                break;
+            }
+
+            line_next(&pattern_line);
+        }
+    }
+
+#if LV_ANTIALIAS
+    lv_coord_t width_safe = width;
+    if(width == 0) width_safe = 1;
+
+    lv_coord_t aa_last_corner;
+    aa_last_corner = 0;
+#endif
+
+    lv_coord_t x_center_ofs = 0;
+    lv_coord_t y_center_ofs = 0;
+
+    if(width != 0) {
+        x_center_ofs = pattern[width - 1].x / 2;
+        y_center_ofs = pattern[width - 1].y / 2;
+    }
+    else {
+        if(main_line->hor && main_line->p1.y >= main_line->p2.y + dir_ori) pattern[0].y --;
+        if(!main_line->hor && main_line->p1.x >= main_line->p2.x + dir_ori) pattern[0].x --;
+    }
+
+    /* Make the coordinates relative to the center */
+    for(i = 0; i < width; i++) {
+        pattern[i].x -= x_center_ofs;
+        pattern[i].y -= y_center_ofs;
+#if LV_ANTIALIAS
+        if(i != 0) {
+            if(main_line->hor) {
+                if(pattern[i - 1].x != pattern[i].x) {
+                    lv_coord_t seg_w = pattern[i].y - pattern[aa_last_corner].y;
+                    if(main_line->sy < 0) {
+                        lv_draw_aa_ver_seg(main_line->p1.x + pattern[aa_last_corner].x - 1, main_line->p1.y + pattern[aa_last_corner].y + seg_w + 1,
+                                seg_w, mask, style->line.color, opa);
+
+                        lv_draw_aa_ver_seg(main_line->p2.x + pattern[aa_last_corner].x + 1, main_line->p2.y + pattern[aa_last_corner].y + seg_w + 1,
+                                -seg_w, mask, style->line.color, opa);
+                    } else {
+                        lv_draw_aa_ver_seg(main_line->p1.x + pattern[aa_last_corner].x - 1, main_line->p1.y + pattern[aa_last_corner].y,
+                                seg_w, mask, style->line.color, opa);
+
+                        lv_draw_aa_ver_seg(main_line->p2.x + pattern[aa_last_corner].x + 1, main_line->p2.y + pattern[aa_last_corner].y,
+                                -seg_w, mask, style->line.color, opa);
+                    }
+                    aa_last_corner = i;
+                }
+            } else {
+                if(pattern[i - 1].y != pattern[i].y) {
+                    lv_coord_t seg_w = pattern[i].x - pattern[aa_last_corner].x;
+                    if(main_line->sx < 0) {
+                        lv_draw_aa_hor_seg(main_line->p1.x + pattern[aa_last_corner].x + seg_w + 1, main_line->p1.y + pattern[aa_last_corner].y - 1,
+                                seg_w, mask, style->line.color, opa);
+
+                        lv_draw_aa_hor_seg(main_line->p2.x + pattern[aa_last_corner].x + seg_w + 1, main_line->p2.y + pattern[aa_last_corner].y + 1,
+                                -seg_w, mask, style->line.color, opa);
+                    } else {
+                        lv_draw_aa_hor_seg(main_line->p1.x + pattern[aa_last_corner].x, main_line->p1.y + pattern[aa_last_corner].y - 1,
+                                seg_w, mask, style->line.color, opa);
+
+                        lv_draw_aa_hor_seg(main_line->p2.x + pattern[aa_last_corner].x, main_line->p2.y + pattern[aa_last_corner].y + 1,
+                                -seg_w, mask, style->line.color, opa);
+                    }
+                    aa_last_corner = i;
+                }
+            }
+
+        }
+#endif
+    }
+
+
+
+#if LV_ANTIALIAS
+    /*Add the last part of anti-aliasing for the perpendicular ending*/
+    if(width != 0) {    /*Due to rounding error with very thin lines it looks ugly*/
+        if(main_line->hor) {
+            lv_coord_t seg_w = pattern[width_safe - 1].y - pattern[aa_last_corner].y;
+            if(main_line->sy < 0) {
+                lv_draw_aa_ver_seg(main_line->p1.x + pattern[aa_last_corner].x - 1, main_line->p1.y + pattern[aa_last_corner].y + seg_w,
+                        seg_w + main_line->sy, mask, style->line.color, opa);
+
+                lv_draw_aa_ver_seg(main_line->p2.x + pattern[aa_last_corner].x + 1, main_line->p2.y + pattern[aa_last_corner].y + seg_w,
+                        -(seg_w + main_line->sy), mask, style->line.color, opa);
+
+            } else {
+                lv_draw_aa_ver_seg(main_line->p1.x + pattern[aa_last_corner].x - 1, main_line->p1.y + pattern[aa_last_corner].y,
+                        seg_w + main_line->sy, mask, style->line.color, opa);
+
+                lv_draw_aa_ver_seg(main_line->p2.x + pattern[aa_last_corner].x + 1, main_line->p2.y + pattern[aa_last_corner].y,
+                        -(seg_w + main_line->sy), mask, style->line.color, opa);
+            }
+        } else {
+            lv_coord_t seg_w = pattern[width_safe - 1].x - pattern[aa_last_corner].x;
+            if(main_line->sx < 0) {
+                lv_draw_aa_hor_seg(main_line->p1.x + pattern[aa_last_corner].x + seg_w, main_line->p1.y + pattern[aa_last_corner].y - 1,
+                        seg_w + main_line->sx, mask, style->line.color, opa);
+
+                lv_draw_aa_hor_seg(main_line->p2.x + pattern[aa_last_corner].x + seg_w, main_line->p2.y + pattern[aa_last_corner].y + 1,
+                        -(seg_w + main_line->sx), mask, style->line.color, opa);
+
+            } else {
+                lv_draw_aa_hor_seg(main_line->p1.x + pattern[aa_last_corner].x, main_line->p1.y + pattern[aa_last_corner].y - 1,
+                        seg_w + main_line->sx, mask, style->line.color, opa);
+
+                lv_draw_aa_hor_seg(main_line->p2.x + pattern[aa_last_corner].x, main_line->p2.y + pattern[aa_last_corner].y + 1,
+                        -(seg_w + main_line->sx), mask, style->line.color, opa);
+            }
+
+        }
+    }
+#endif
+
+#if LV_ANTIALIAS
+
+    /*Shift the anti aliasing on the edges (-1, 1 or 0 (zero only in case width == 0))*/
+    lv_coord_t aa_shift1;
+    lv_coord_t aa_shift2;
+
+    if(main_line->hor == false) {
+        if(main_line->sx < 0) {
+            aa_shift1 = -1;
+            aa_shift2 = width == 0 ? 0 : aa_shift1;
+        } else {
+            aa_shift2 = 1;
+            aa_shift1 = width == 0 ? 0 : aa_shift2;
+        }
+    } else {
+        if(main_line->sy < 0) {
+            aa_shift1 = -1;
+            aa_shift2 = width == 0 ? 0 : aa_shift1;
+        } else {
+            aa_shift2 = 1;
+            aa_shift1 = width == 0 ? 0 : aa_shift2;
+        }
+    }
+
+#endif
+
+    volatile lv_point_t prev_p;
+    prev_p.x = main_line->p1.x;
+    prev_p.y = main_line->p1.y;
+    lv_area_t draw_area;
+    bool first_run = true;
+
+    if(main_line->hor) {
+        while(line_next_y(main_line)) {
+            for(i = 0; i < width; i++) {
+                draw_area.x1 = prev_p.x + pattern[i].x;
+                draw_area.y1 = prev_p.y + pattern[i].y;
+                draw_area.x2 = draw_area.x1 + main_line->p_act.x - prev_p.x - 1;
+                draw_area.y2 = draw_area.y1;
+                fill_fp(&draw_area, mask, style->line.color, opa);
+
+                /* Fill the gaps
+                 * When stepping in y one pixel remains empty on every corner (don't do this on the first segment ) */
+                if(i != 0 && pattern[i].x != pattern[i - 1].x && !first_run) {
+                    px_fp(draw_area.x1, draw_area.y1 - main_line->sy, mask, style->line.color, opa);
+                }
+            }
+
+#if LV_ANTIALIAS
+            lv_draw_aa_hor_seg(prev_p.x + pattern[0].x, prev_p.y + pattern[0].y - aa_shift1,
+                    -(main_line->p_act.x - prev_p.x), mask, style->line.color, opa);
+            lv_draw_aa_hor_seg(prev_p.x + pattern[width_safe - 1].x, prev_p.y + pattern[width_safe - 1].y + aa_shift2,
+                    main_line->p_act.x - prev_p.x, mask, style->line.color, opa);
+#endif
+
+            first_run = false;
+
+            prev_p.x = main_line->p_act.x;
+            prev_p.y = main_line->p_act.y;
+        }
+
+        for(i = 0; i < width; i++) {
+            draw_area.x1 = prev_p.x + pattern[i].x;
+            draw_area.y1 = prev_p.y + pattern[i].y;
+            draw_area.x2 = draw_area.x1 + main_line->p_act.x - prev_p.x;
+            draw_area.y2 = draw_area.y1;
+            fill_fp(&draw_area, mask, style->line.color, opa);
+
+            /* Fill the gaps
+             * When stepping in y one pixel remains empty on every corner */
+            if(i != 0 && pattern[i].x != pattern[i - 1].x && !first_run) {
+                px_fp(draw_area.x1, draw_area.y1 - main_line->sy, mask, style->line.color, opa);
+            }
+        }
+
+#if LV_ANTIALIAS
+        lv_draw_aa_hor_seg(prev_p.x + pattern[0].x, prev_p.y + pattern[0].y - aa_shift1,
+                -(main_line->p_act.x - prev_p.x + 1), mask, style->line.color, opa);
+        lv_draw_aa_hor_seg(prev_p.x + pattern[width_safe - 1].x, prev_p.y + pattern[width_safe - 1].y + aa_shift2,
+                main_line->p_act.x - prev_p.x + 1, mask, style->line.color, opa);
+#endif
+    }
+    /*Rather a vertical line*/
+    else {
+
+        while(line_next_x(main_line)) {
+            for(i = 0; i < width; i++) {
+                draw_area.x1 = prev_p.x + pattern[i].x;
+                draw_area.y1 = prev_p.y + pattern[i].y;
+                draw_area.x2 = draw_area.x1;
+                draw_area.y2 = draw_area.y1 + main_line->p_act.y - prev_p.y - 1;
+
+                fill_fp(&draw_area, mask, style->line.color, opa);
+
+                /* Fill the gaps
+                 * When stepping in x one pixel remains empty on every corner (don't do this on the first segment ) */
+                if(i != 0 && pattern[i].y != pattern[i - 1].y && !first_run) {
+                    px_fp(draw_area.x1 - main_line->sx, draw_area.y1, mask, style->line.color, opa);
+                }
+
+            }
+
+#if LV_ANTIALIAS
+            lv_draw_aa_ver_seg(prev_p.x + pattern[0].x - aa_shift1, prev_p.y + pattern[0].y,
+                    -(main_line->p_act.y - prev_p.y), mask, style->line.color, opa);
+            lv_draw_aa_ver_seg(prev_p.x + pattern[width_safe - 1].x + aa_shift2, prev_p.y + pattern[width_safe - 1].y,
+                    main_line->p_act.y - prev_p.y, mask, style->line.color, opa);
+#endif
+
+            first_run = false;
+
+            prev_p.x = main_line->p_act.x;
+            prev_p.y = main_line->p_act.y;
+        }
+
+        /*Draw the last part*/
+        for(i = 0; i < width; i++) {
+            draw_area.x1 = prev_p.x + pattern[i].x;
+            draw_area.y1 = prev_p.y + pattern[i].y;
+            draw_area.x2 = draw_area.x1;
+            draw_area.y2 = draw_area.y1 + main_line->p_act.y - prev_p.y;
+
+            fill_fp(&draw_area, mask, style->line.color, opa);
+
+            /* Fill the gaps
+             * When stepping in x one pixel remains empty on every corner */
+            if(i != 0 && pattern[i].y != pattern[i - 1].y && !first_run) {
+                px_fp(draw_area.x1 - main_line->sx, draw_area.y1, mask, style->line.color, opa);
+            }
+        }
+
+#if LV_ANTIALIAS
+        lv_draw_aa_ver_seg(prev_p.x + pattern[0].x - aa_shift1, prev_p.y + pattern[0].y,
+                -(main_line->p_act.y - prev_p.y + 1), mask, style->line.color, opa);
+        lv_draw_aa_ver_seg(prev_p.x + pattern[width_safe - 1].x + aa_shift2, prev_p.y + pattern[width_safe - 1].y,
+                main_line->p_act.y - prev_p.y + 1, mask, style->line.color, opa);
+#endif
+    }
+}
+
+
+static void line_init(line_draw_t * line, const lv_point_t * p1, const lv_point_t * p2)
+{
+    line->p1.x = p1->x;
+    line->p1.y = p1->y;
+    line->p2.x = p2->x;
+    line->p2.y = p2->y;
+
+    line->dx = LV_MATH_ABS(line->p2.x - line->p1.x);
+    line->sx = line->p1.x < line->p2.x ? 1 : -1;
+    line->dy = LV_MATH_ABS(line->p2.y - line->p1.y);
+    line->sy = line->p1.y < line->p2.y ? 1 : -1;
+    line->err = (line->dx > line->dy ? line->dx : -line->dy) / 2;
+    line->e2 = 0;
+    line->hor = line->dx > line->dy ? true : false; /*Rather horizontal or vertical*/
+
+    line->p_act.x = line->p1.x;
+    line->p_act.y = line->p1.y;
+}
+
+static bool line_next(line_draw_t * line)
+{
+    if(line->p_act.x == line->p2.x && line->p_act.y == line->p2.y) return false;
+    line->e2 = line->err;
+    if(line->e2 > -line->dx) {
+        line->err -= line->dy;
+        line->p_act.x += line->sx;
+    }
+    if(line->e2 < line->dy) {
+        line->err += line->dx;
+        line->p_act.y += line->sy;
+    }
+    return true;
+}
+
+/**
+ * Iterate until step one in y direction.
+ * @param line
+ * @return
+ */
+static bool line_next_y(line_draw_t * line)
+{
+    lv_coord_t last_y = line->p_act.y;
+
+    do {
+        if(!line_next(line)) return false;
+    } while(last_y == line->p_act.y);
+
+    return true;
+
+}
+
+/**
+ * Iterate until step one in x direction.
+ * @param line
+ * @return
+ */
+static bool line_next_x(line_draw_t * line)
+{
+    lv_coord_t last_x = line->p_act.x;
+
+    do {
+        if(!line_next(line)) return false;
+    } while(last_x == line->p_act.x);
+
+    return true;
+
+}
+

bdk/libs/lvgl/lv_draw/lv_draw_line.h

@@ -0,0 +1,49 @@
+/**
+ * @file lv_draw_line.h
+ *
+ */
+
+#ifndef LV_DRAW_LINE_H
+#define LV_DRAW_LINE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Draw a line
+ * @param point1 first point of the line
+ * @param point2 second point of the line
+ * @param mask the line will be drawn only on this area
+ * @param style pointer to a line's style
+ * @param opa_scale scale down all opacities by the factor
+ */
+void lv_draw_line(const lv_point_t * point1, const lv_point_t * point2, const lv_area_t * mask,
+                  const lv_style_t * style, lv_opa_t opa_scale);
+
+/**********************
+ *      MACROS
+ **********************/
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_DRAW_LINE_H*/

bdk/libs/lvgl/lv_draw/lv_draw_rbasic.c

@@ -0,0 +1,269 @@
+/**
+ * @file lv_draw_rbasic.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw_rbasic.h"
+#if USE_LV_REAL_DRAW != 0
+
+#include "../lv_hal/lv_hal_disp.h"
+#include "../lv_misc/lv_font.h"
+#include "lv_draw.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+static lv_color_t letter_bg_color;
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Put a pixel to the display
+ * @param x x coordinate of the pixel
+ * @param y y coordinate of the pixel
+ * @param mask_p the pixel will be drawn on this area
+ * @param color color of the pixel
+ * @param opa opacity (ignored, only for compatibility with lv_vpx)
+ */
+void lv_rpx(lv_coord_t x, lv_coord_t y, const lv_area_t * mask_p, lv_color_t color, lv_opa_t opa)
+{
+    (void)opa;      /*Opa is used only for compatibility with lv_vpx*/
+
+    lv_area_t area;
+    area.x1 = x;
+    area.y1 = y;
+    area.x2 = x;
+    area.y2 = y;
+
+    lv_rfill(&area, mask_p, color, LV_OPA_COVER);
+}
+
+/**
+ * Fill an area on the display
+ * @param cords_p coordinates of the area to fill
+ * @param mask_p fill only o this mask
+ * @param color fill color
+ * @param opa opacity (ignored, only for compatibility with lv_vfill)
+ */
+void lv_rfill(const lv_area_t * cords_p, const lv_area_t * mask_p,
+              lv_color_t color, lv_opa_t opa)
+{
+
+    (void)opa;      /*Opa is used only for compatibility with lv_vfill*/
+
+    lv_area_t masked_area;
+    bool union_ok = true;
+
+    if(mask_p != NULL) {
+        union_ok = lv_area_intersect(&masked_area, cords_p, mask_p);
+    } else {
+        lv_area_t scr_area;
+        lv_area_set(&scr_area, 0, 0, LV_HOR_RES - 1, LV_VER_RES - 1);
+        union_ok = lv_area_intersect(&masked_area, cords_p, &scr_area);
+    }
+
+    if(union_ok != false) {
+        lv_disp_fill(masked_area.x1, masked_area.y1, masked_area.x2, masked_area.y2, color);
+    }
+}
+
+/**
+ * Draw a letter to the display
+ * @param pos_p left-top coordinate of the latter
+ * @param mask_p the letter will be drawn only on this area
+ * @param font_p pointer to font
+ * @param letter a letter to draw
+ * @param color color of letter
+ * @param opa opacity of letter (ignored, only for compatibility with lv_vletter)
+ */
+void lv_rletter(const lv_point_t * pos_p, const lv_area_t * mask_p,
+                const lv_font_t * font_p, uint32_t letter,
+                lv_color_t color, lv_opa_t opa)
+{
+    (void)opa;      /*Opa is used only for compatibility with lv_vletter*/
+
+    static uint8_t bpp1_opa_table[2] =  {0, 255};                   /*Opacity mapping with bpp = 1 (Just for compatibility)*/
+    static uint8_t bpp2_opa_table[4] =  {0, 85, 170, 255};          /*Opacity mapping with bpp = 2*/
+    static uint8_t bpp4_opa_table[16] = {0,   17,  34,  51,         /*Opacity mapping with bpp = 4*/
+                                         68,  85,  102, 119,
+                                         136, 153, 170, 187,
+                                         204, 221, 238, 255
+                                        };
+
+    if(font_p == NULL) return;
+
+    uint8_t letter_w = lv_font_get_width(font_p, letter);
+    uint8_t letter_h = lv_font_get_height(font_p);
+    uint8_t bpp = lv_font_get_bpp(font_p, letter);  /*Bit per pixel (1,2, 4 or 8)*/
+    uint8_t * bpp_opa_table;
+    uint8_t mask_init;
+    uint8_t mask;
+
+    switch(bpp) {
+        case 1:
+            bpp_opa_table = bpp1_opa_table;
+            mask_init = 0x80;
+            break;
+        case 2:
+            bpp_opa_table = bpp2_opa_table;
+            mask_init = 0xC0;
+            break;
+        case 4:
+            bpp_opa_table = bpp4_opa_table;
+            mask_init = 0xF0;
+            break;
+        case 8:
+            bpp_opa_table = NULL;
+            mask_init = 0xFF;
+            break;             /*No opa table, pixel value will be used directly*/
+        default:
+            return;        /*Invalid bpp. Can't render the letter*/
+    }
+
+    const uint8_t * map_p = lv_font_get_bitmap(font_p, letter);
+
+    if(map_p == NULL) return;
+
+    /*If the letter is completely out of mask don't draw it */
+    if(pos_p->x + letter_w < mask_p->x1 || pos_p->x > mask_p->x2 ||
+            pos_p->y + letter_h < mask_p->y1 || pos_p->y > mask_p->y2) return;
+
+    lv_coord_t col, row;
+    uint8_t col_bit;
+    uint8_t col_byte_cnt;
+    uint8_t width_byte_scr = letter_w >> 3;      /*Width in bytes (on the screen finally) (e.g. w = 11 -> 2 bytes wide)*/
+    if(letter_w & 0x7) width_byte_scr++;
+    uint8_t width_byte_bpp = (letter_w * bpp) >> 3;    /*Letter width in byte. Real width in the font*/
+    if((letter_w * bpp) & 0x7) width_byte_bpp++;
+
+    /* Calculate the col/row start/end on the map*/
+    lv_coord_t col_start = pos_p->x >= mask_p->x1 ? 0 : mask_p->x1 - pos_p->x;
+    lv_coord_t col_end = pos_p->x + letter_w <= mask_p->x2 ? letter_w : mask_p->x2 - pos_p->x + 1;
+    lv_coord_t row_start = pos_p->y >= mask_p->y1 ? 0 : mask_p->y1 - pos_p->y;
+    lv_coord_t row_end  = pos_p->y + letter_h <= mask_p->y2 ? letter_h : mask_p->y2 - pos_p->y + 1;
+
+    /*Move on the map too*/
+    map_p += (row_start * width_byte_bpp) + ((col_start * bpp) >> 3);
+
+    uint8_t letter_px;
+    for(row = row_start; row < row_end; row ++) {
+        col_byte_cnt = 0;
+        col_bit = (col_start * bpp) % 8;
+        mask = mask_init >> col_bit;
+        for(col = col_start; col < col_end; col ++) {
+            letter_px = (*map_p & mask) >> (8 - col_bit - bpp);
+            if(letter_px != 0) {
+                lv_rpx(pos_p->x + col, pos_p->y + row, mask_p, lv_color_mix(color, letter_bg_color, bpp == 8 ? letter_px : bpp_opa_table[letter_px]), LV_OPA_COVER);
+            }
+
+            if(col_bit < 8 - bpp) {
+                col_bit += bpp;
+                mask = mask >> bpp;
+            } else {
+                col_bit = 0;
+                col_byte_cnt ++;
+                mask = mask_init;
+                map_p ++;
+            }
+        }
+
+        map_p += (width_byte_bpp) - col_byte_cnt;
+    }
+}
+
+/**
+ * When the letter is ant-aliased it needs to know the background color
+ * @param bg_color the background color of the currently drawn letter
+ */
+void lv_rletter_set_background(lv_color_t color)
+{
+    letter_bg_color = color;
+}
+
+/**
+ * Draw a color map to the display (image)
+ * @param cords_p coordinates the color map
+ * @param mask_p the map will drawn only on this area
+ * @param map_p pointer to a lv_color_t array
+ * @param opa opacity of the map (ignored, only for compatibility with 'lv_vmap')
+ * @param chroma_keyed true: enable transparency of LV_IMG_LV_COLOR_TRANSP color pixels
+ * @param alpha_byte true: extra alpha byte is inserted for every pixel (not supported, only l'v_vmap' can draw it)
+ * @param recolor mix the pixels with this color
+ * @param recolor_opa the intense of recoloring
+ */
+void lv_rmap(const lv_area_t * cords_p, const lv_area_t * mask_p,
+             const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
+             lv_color_t recolor, lv_opa_t recolor_opa)
+{
+    if(alpha_byte) return;      /*Pixel level opacity i not supported in real map drawing*/
+
+    (void)opa;              /*opa is used only for compatibility with lv_vmap*/
+    lv_area_t masked_a;
+    bool union_ok;
+
+    union_ok = lv_area_intersect(&masked_a, cords_p, mask_p);
+
+    /*If there are common part of the mask and map then draw the map*/
+    if(union_ok == false) return;
+
+    /*Go to the first pixel*/
+    lv_coord_t map_width = lv_area_get_width(cords_p);
+    map_p += (masked_a.y1 - cords_p->y1) * map_width * sizeof(lv_color_t);
+    map_p += (masked_a.x1 - cords_p->x1) * sizeof(lv_color_t);
+
+    lv_coord_t row;
+    if(recolor_opa == LV_OPA_TRANSP && chroma_key == false) {
+        lv_coord_t mask_w = lv_area_get_width(&masked_a) - 1;
+        for(row = masked_a.y1; row <= masked_a.y2; row++) {
+            lv_disp_map(masked_a.x1, row, masked_a.x1 + mask_w, row, (lv_color_t *)map_p);
+            map_p += map_width * sizeof(lv_color_t);               /*Next row on the map*/
+        }
+    } else {
+        lv_color_t chroma_key_color = LV_COLOR_TRANSP;
+        lv_coord_t col;
+        for(row = masked_a.y1; row <= masked_a.y2; row++) {
+            for(col = masked_a.x1; col <= masked_a.x2; col++) {
+                lv_color_t * px_color = (lv_color_t *) &map_p[(uint32_t)(col - masked_a.x1) * sizeof(lv_color_t)];
+
+                if(chroma_key && chroma_key_color.full == px_color->full) continue;
+
+                if(recolor_opa != LV_OPA_TRANSP) {
+                    lv_color_t recolored_px = lv_color_mix(recolor, *px_color, recolor_opa);
+
+                    lv_rpx(col, row, mask_p, recolored_px, LV_OPA_COVER);
+                } else {
+                    lv_rpx(col, row, mask_p, *px_color, LV_OPA_COVER);
+                }
+
+            }
+            map_p += map_width * sizeof(lv_color_t);               /*Next row on the map*/
+        }
+    }
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+#endif  /*USE_LV_REAL_DRAW*/

bdk/libs/lvgl/lv_draw/lv_draw_rbasic.h

@@ -0,0 +1,96 @@
+/**
+ * @file lv_draw_rbasic..h
+ *
+ */
+
+#ifndef LV_DRAW_RBASIC_H
+#define LV_DRAW_RBASIC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#ifdef LV_CONF_INCLUDE_SIMPLE
+#include "lv_conf.h"
+#else
+#include "../../lv_conf.h"
+#endif
+
+#if USE_LV_REAL_DRAW != 0
+
+#include "../lv_misc/lv_color.h"
+#include "../lv_misc/lv_area.h"
+#include "../lv_misc/lv_font.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+void lv_rpx(lv_coord_t x, lv_coord_t y, const lv_area_t * mask_p, lv_color_t color, lv_opa_t opa);
+
+/**
+ * Fill an area on the display
+ * @param cords_p coordinates of the area to fill
+ * @param mask_p fill only o this mask
+ * @param color fill color
+ * @param opa opacity (ignored, only for compatibility with lv_vfill)
+ */
+void lv_rfill(const lv_area_t * cords_p, const lv_area_t * mask_p,
+              lv_color_t color, lv_opa_t opa);
+
+/**
+ * Draw a letter to the display
+ * @param pos_p left-top coordinate of the latter
+ * @param mask_p the letter will be drawn only on this area
+ * @param font_p pointer to font
+ * @param letter a letter to draw
+ * @param color color of letter
+ * @param opa opacity of letter (ignored, only for compatibility with lv_vletter)
+ */
+void lv_rletter(const lv_point_t * pos_p, const lv_area_t * mask_p,
+                const lv_font_t * font_p, uint32_t letter,
+                lv_color_t color, lv_opa_t opa);
+
+/**
+ * When the letter is ant-aliased it needs to know the background color
+ * @param bg_color the background color of the currently drawn letter
+ */
+void lv_rletter_set_background(lv_color_t color);
+
+
+/**
+ * Draw a color map to the display (image)
+ * @param cords_p coordinates the color map
+ * @param mask_p the map will drawn only on this area
+ * @param map_p pointer to a lv_color_t array
+ * @param opa opacity of the map (ignored, only for compatibility with 'lv_vmap')
+ * @param chroma_keyed true: enable transparency of LV_IMG_LV_COLOR_TRANSP color pixels
+ * @param alpha_byte true: extra alpha byte is inserted for every pixel (not supported, only l'v_vmap' can draw it)
+ * @param recolor mix the pixels with this color
+ * @param recolor_opa the intense of recoloring
+ */
+void lv_rmap(const lv_area_t * cords_p, const lv_area_t * mask_p,
+             const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
+             lv_color_t recolor, lv_opa_t recolor_opa);
+/**********************
+ *      MACROS
+ **********************/
+
+#endif  /*USE_LV_REAL_DRAW*/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif  /*LV_DRAW_RBASIC_H*/

bdk/libs/lvgl/lv_draw/lv_draw_rect.h

@@ -0,0 +1,48 @@
+/**
+ * @file lv_draw_rect.h
+ *
+ */
+
+#ifndef LV_DRAW_RECT_H
+#define LV_DRAW_RECT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Draw a rectangle
+ * @param coords the coordinates of the rectangle
+ * @param mask the rectangle will be drawn only in this mask
+ * @param style pointer to a style
+ * @param opa_scale scale down all opacities by the factor
+ */
+void lv_draw_rect(const lv_area_t * coords, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale);
+
+/**********************
+ *      MACROS
+ **********************/
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_DRAW_RECT_H*/

bdk/libs/lvgl/lv_draw/lv_draw_triangle.c

@@ -0,0 +1,168 @@
+/**
+ * @file lv_draw_triangle.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw_triangle.h"
+#include "../lv_misc/lv_math.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+static void point_swap(lv_point_t * p1, lv_point_t * p2);
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+#if USE_LV_TRIANGLE != 0
+/**
+ *
+ * @param points pointer to an array with 3 points
+ * @param mask the triangle will be drawn only in this mask
+ * @param color color of the triangle
+ */
+void lv_draw_triangle(const lv_point_t * points, const lv_area_t * mask, lv_color_t color)
+{
+    lv_point_t tri[3];
+
+    memcpy(tri, points, sizeof(tri));
+
+    /*Sort the vertices according to their y coordinate (0: y max, 1: y mid, 2:y min)*/
+    if(tri[1].y < tri[0].y) point_swap(&tri[1], &tri[0]);
+    if(tri[2].y < tri[1].y) point_swap(&tri[2], &tri[1]);
+    if(tri[1].y < tri[0].y) point_swap(&tri[1], &tri[0]);
+
+    /*Return is the triangle is degenerated*/
+    if(tri[0].x == tri[1].x && tri[0].y == tri[1].y) return;
+    if(tri[1].x == tri[2].x && tri[1].y == tri[2].y) return;
+    if(tri[0].x == tri[2].x && tri[0].y == tri[2].y) return;
+
+    if(tri[0].x == tri[1].x && tri[1].x == tri[2].x) return;
+    if(tri[0].y == tri[1].y && tri[1].y == tri[2].y) return;
+
+    /*Draw the triangle*/
+    lv_point_t edge1;
+    lv_coord_t dx1 = LV_MATH_ABS(tri[0].x - tri[1].x);
+    lv_coord_t sx1 = tri[0].x < tri[1].x ? 1 : -1;
+    lv_coord_t dy1 = LV_MATH_ABS(tri[0].y - tri[1].y);
+    lv_coord_t sy1 = tri[0].y < tri[1].y ? 1 : -1;
+    lv_coord_t err1 = (dx1 > dy1 ? dx1 : -dy1) / 2;
+    lv_coord_t err_tmp1;
+
+    lv_point_t edge2;
+    lv_coord_t dx2 = LV_MATH_ABS(tri[0].x - tri[2].x);
+    lv_coord_t sx2 = tri[0].x < tri[2].x ? 1 : -1;
+    lv_coord_t dy2 = LV_MATH_ABS(tri[0].y - tri[2].y);
+    lv_coord_t sy2 = tri[0].y < tri[2].y ? 1 : -1;
+    lv_coord_t err2 = (dx1 > dy2 ? dx2 : -dy2) / 2;
+    lv_coord_t err_tmp2;
+
+    lv_coord_t y1_tmp;
+    lv_coord_t y2_tmp;
+
+    edge1.x = tri[0].x;
+    edge1.y = tri[0].y;
+    edge2.x = tri[0].x;
+    edge2.y = tri[0].y;
+    lv_area_t act_area;
+    lv_area_t draw_area;
+
+    while(1) {
+        act_area.x1 = edge1.x;
+        act_area.x2 = edge2.x ;
+        act_area.y1 = edge1.y;
+        act_area.y2 = edge2.y ;
+
+
+        draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2);
+        draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2);
+        draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2);
+        draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2);
+        draw_area.x2--; /*Do not draw most right pixel because it will be drawn by the adjacent triangle*/
+        fill_fp(&draw_area, mask, color, LV_OPA_50);
+
+        /*Calc. the next point of edge1*/
+        y1_tmp = edge1.y;
+        do {
+            if(edge1.x == tri[1].x && edge1.y == tri[1].y) {
+
+                dx1 = LV_MATH_ABS(tri[1].x - tri[2].x);
+                sx1 = tri[1].x < tri[2].x ? 1 : -1;
+                dy1 = LV_MATH_ABS(tri[1].y - tri[2].y);
+                sy1 = tri[1].y < tri[2].y ? 1 : -1;
+                err1 = (dx1 > dy1 ? dx1 : -dy1) / 2;
+            } else if(edge1.x == tri[2].x && edge1.y == tri[2].y) return;
+            err_tmp1 = err1;
+            if(err_tmp1 > -dx1) {
+                err1 -= dy1;
+                edge1.x += sx1;
+            }
+            if(err_tmp1 < dy1) {
+                err1 += dx1;
+                edge1.y += sy1;
+            }
+        } while(edge1.y == y1_tmp);
+
+        /*Calc. the next point of edge2*/
+        y2_tmp = edge2.y;
+        do {
+            if(edge2.x == tri[2].x && edge2.y == tri[2].y) return;
+            err_tmp2 = err2;
+            if(err_tmp2 > -dx2) {
+                err2 -= dy2;
+                edge2.x += sx2;
+            }
+            if(err_tmp2 < dy2) {
+                err2 += dx2;
+                edge2.y += sy2;
+            }
+        } while(edge2.y == y2_tmp);
+    }
+}
+#endif
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+
+#if USE_LV_TRIANGLE != 0
+/**
+ * Swap two points
+ * p1 pointer to the first point
+ * p2 pointer to the second point
+ */
+static void point_swap(lv_point_t * p1, lv_point_t * p2)
+{
+    lv_point_t tmp;
+    tmp.x = p1->x;
+    tmp.y = p1->y;
+
+    p1->x = p2->x;
+    p1->y = p2->y;
+
+    p2->x = tmp.x;
+    p2->y = tmp.y;
+
+}
+
+#endif

bdk/libs/lvgl/lv_draw/lv_draw_triangle.h

@@ -0,0 +1,51 @@
+/**
+ * @file lv_draw_triangle.h
+ *
+ */
+
+#ifndef LV_DRAW_TRIANGLE_H
+#define LV_DRAW_TRIANGLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+/*Experimental use for 3D modeling*/
+#define USE_LV_TRIANGLE 1
+
+#if USE_LV_TRIANGLE != 0
+/**
+ *
+ * @param points pointer to an array with 3 points
+ * @param mask the triangle will be drawn only in this mask
+ * @param color color of the triangle
+ */
+void lv_draw_triangle(const lv_point_t * points, const lv_area_t * mask, lv_color_t color);
+#endif
+
+/**********************
+ *      MACROS
+ **********************/
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_DRAW_TRIANGLE_H*/

bdk/libs/lvgl/lv_draw/lv_draw_vbasic.c

@@ -0,0 +1,691 @@
+/**
+ * @file lv_vdraw.c
+ *
+ */
+
+#include "lv_draw_vbasic.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include "../lv_hal/lv_hal_disp.h"
+#include "../lv_misc/lv_area.h"
+#include "../lv_misc/lv_font.h"
+#include "../lv_misc/lv_color.h"
+#include "../lv_misc/lv_log.h"
+
+#if LV_VDB_SIZE != 0
+
+#include <stddef.h>
+#include "../lv_core/lv_vdb.h"
+#include "lv_draw.h"
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+#define VFILL_HW_ACC_SIZE_LIMIT    50      /*Always fill < 50 px with 'sw_color_fill' because of the hw. init overhead*/
+
+#ifndef LV_ATTRIBUTE_MEM_ALIGN
+#define LV_ATTRIBUTE_MEM_ALIGN
+#endif
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static void sw_mem_blend(lv_color_t * dest, const lv_color_t * src, uint32_t length, lv_opa_t opa);
+static void sw_color_fill(lv_area_t * mem_area, lv_color_t * mem, const lv_area_t * fill_area, lv_color_t color, lv_opa_t opa);
+
+#if LV_COLOR_SCREEN_TRANSP
+static inline lv_color_t color_mix_2_alpha(lv_color_t bg_color, lv_opa_t bg_opa, lv_color_t fg_color, lv_opa_t fg_opa);
+#endif
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Put a pixel in the Virtual Display Buffer
+ * @param x pixel x coordinate
+ * @param y pixel y coordinate
+ * @param mask_p fill only on this mask (truncated to VDB area)
+ * @param color pixel color
+ * @param opa opacity of the area (0..255)
+ */
+void lv_vpx(lv_coord_t x, lv_coord_t y, const lv_area_t * mask_p, lv_color_t color, lv_opa_t opa)
+{
+    if(opa < LV_OPA_MIN) return;
+    if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
+
+    lv_vdb_t * vdb_p = lv_vdb_get();
+    if(!vdb_p) {
+        LV_LOG_WARN("Invalid VDB pointer");
+        return;
+    }
+
+    /*Pixel out of the mask*/
+    if(x < mask_p->x1 || x > mask_p->x2 ||
+            y < mask_p->y1 || y > mask_p->y2) {
+        return;
+    }
+
+    uint32_t vdb_width = lv_area_get_width(&vdb_p->area);
+
+    /*Make the coordinates relative to VDB*/
+    x -= vdb_p->area.x1;
+    y -= vdb_p->area.y1;
+
+    lv_disp_t * disp = lv_disp_get_active();
+    if(disp->driver.vdb_wr) {
+        disp->driver.vdb_wr((uint8_t *)vdb_p->buf, vdb_width, x, y, color, opa);
+    } else {
+        lv_color_t * vdb_px_p = vdb_p->buf + y * vdb_width + x;
+#if LV_COLOR_SCREEN_TRANSP == 0
+        if(opa == LV_OPA_COVER) {
+            *vdb_px_p = color;
+        } else {
+            *vdb_px_p = lv_color_mix(color, *vdb_px_p, opa);
+        }
+#else
+        *vdb_px_p = color_mix_2_alpha(*vdb_px_p, (*vdb_px_p).alpha, color, opa);
+#endif
+    }
+}
+
+
+/**
+ * Fill an area in the Virtual Display Buffer
+ * @param cords_p coordinates of the area to fill
+ * @param mask_p fill only o this mask  (truncated to VDB area)
+ * @param color fill color
+ * @param opa opacity of the area (0..255)
+ */
+void lv_vfill(const lv_area_t * cords_p, const lv_area_t * mask_p,
+              lv_color_t color, lv_opa_t opa)
+{
+    if(opa < LV_OPA_MIN) return;
+    if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
+
+    lv_area_t res_a;
+    bool union_ok;
+    lv_vdb_t * vdb_p = lv_vdb_get();
+    if(!vdb_p) {
+        LV_LOG_WARN("Invalid VDB pointer");
+        return;
+    }
+
+    /*Get the union of cord and mask*/
+    /* The mask is already truncated to the vdb size
+     * in 'lv_refr_area_with_vdb' function */
+    union_ok = lv_area_intersect(&res_a, cords_p, mask_p);
+
+    /*If there are common part of the three area then draw to the vdb*/
+    if(union_ok == false) return;
+
+    lv_area_t vdb_rel_a;   /*Stores relative coordinates on vdb*/
+    vdb_rel_a.x1 = res_a.x1 - vdb_p->area.x1;
+    vdb_rel_a.y1 = res_a.y1 - vdb_p->area.y1;
+    vdb_rel_a.x2 = res_a.x2 - vdb_p->area.x1;
+    vdb_rel_a.y2 = res_a.y2 - vdb_p->area.y1;
+
+    lv_color_t * vdb_buf_tmp = vdb_p->buf;
+    uint32_t vdb_width = lv_area_get_width(&vdb_p->area);
+    /*Move the vdb_tmp to the first row*/
+    vdb_buf_tmp += vdb_width * vdb_rel_a.y1;
+
+
+#if USE_LV_GPU
+    static LV_ATTRIBUTE_MEM_ALIGN lv_color_t color_array_tmp[LV_HOR_RES];       /*Used by 'lv_disp_mem_blend'*/
+    static lv_coord_t last_width = -1;
+
+    lv_coord_t w = lv_area_get_width(&vdb_rel_a);
+    /*Don't use hw. acc. for every small fill (because of the init overhead)*/
+    if(w < VFILL_HW_ACC_SIZE_LIMIT) {
+        sw_color_fill(&vdb_p->area, vdb_p->buf, &vdb_rel_a, color, opa);
+    }
+    /*Not opaque fill*/
+    else if(opa == LV_OPA_COVER) {
+        /*Use hw fill if present*/
+        if(lv_disp_is_mem_fill_supported()) {
+            lv_coord_t row;
+            for(row = vdb_rel_a.y1; row <= vdb_rel_a.y2; row++) {
+                lv_disp_mem_fill(&vdb_buf_tmp[vdb_rel_a.x1], w, color);
+                vdb_buf_tmp += vdb_width;
+            }
+        }
+        /*Use hw blend if present and the area is not too small*/
+        else if(lv_area_get_height(&vdb_rel_a) > VFILL_HW_ACC_SIZE_LIMIT &&
+                lv_disp_is_mem_blend_supported()) {
+            /*Fill a  one line sized buffer with a color and blend this later*/
+            if(color_array_tmp[0].full != color.full || last_width != w) {
+                uint16_t i;
+                for(i = 0; i < w; i++) {
+                    color_array_tmp[i].full = color.full;
+                }
+                last_width = w;
+            }
+
+            /*Blend the filled line to every line VDB line-by-line*/
+            lv_coord_t row;
+            for(row = vdb_rel_a.y1; row <= vdb_rel_a.y2; row++) {
+                lv_disp_mem_blend(&vdb_buf_tmp[vdb_rel_a.x1], color_array_tmp, w, opa);
+                vdb_buf_tmp += vdb_width;
+            }
+
+        }
+        /*Else use sw fill if no better option*/
+        else {
+            sw_color_fill(&vdb_p->area, vdb_p->buf, &vdb_rel_a, color, opa);
+        }
+
+    }
+    /*Fill with opacity*/
+    else {
+        /*Use hw blend if present*/
+        if(lv_disp_is_mem_blend_supported()) {
+            if(color_array_tmp[0].full != color.full || last_width != w) {
+                uint16_t i;
+                for(i = 0; i < w; i++) {
+                    color_array_tmp[i].full = color.full;
+                }
+
+                last_width = w;
+            }
+            lv_coord_t row;
+            for(row = vdb_rel_a.y1; row <= vdb_rel_a.y2; row++) {
+                lv_disp_mem_blend(&vdb_buf_tmp[vdb_rel_a.x1], color_array_tmp, w, opa);
+                vdb_buf_tmp += vdb_width;
+            }
+
+        }
+        /*Use sw fill with opa if no better option*/
+        else {
+            sw_color_fill(&vdb_p->area, vdb_p->buf, &vdb_rel_a, color, opa);
+        }
+
+    }
+#else
+    sw_color_fill(&vdb_p->area, vdb_p->buf, &vdb_rel_a, color, opa);
+#endif
+}
+
+/**
+ * Draw a letter in the Virtual Display Buffer
+ * @param pos_p left-top coordinate of the latter
+ * @param mask_p the letter will be drawn only on this area  (truncated to VDB area)
+ * @param font_p pointer to font
+ * @param letter a letter to draw
+ * @param color color of letter
+ * @param opa opacity of letter (0..255)
+ */
+void lv_vletter(const lv_point_t * pos_p, const lv_area_t * mask_p,
+                const lv_font_t * font_p, uint32_t letter,
+                lv_color_t color, lv_opa_t opa)
+{
+    const uint8_t bpp1_opa_table[2] =  {0, 255};                   /*Opacity mapping with bpp = 1 (Just for compatibility)*/
+    const uint8_t bpp2_opa_table[4] =  {0, 85, 170, 255};          /*Opacity mapping with bpp = 2*/
+    const uint8_t bpp4_opa_table[16] = {0,   17,  34,  51,         /*Opacity mapping with bpp = 4*/
+                                        68,  85,  102, 119,
+                                        136, 153, 170, 187,
+                                        204, 221, 238, 255
+                                       };
+    if(opa < LV_OPA_MIN) return;
+    if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
+
+    if(font_p == NULL) {
+        LV_LOG_WARN("Font: character's bitmap not found");
+        return;
+    }
+
+    lv_coord_t pos_x = pos_p->x;
+    lv_coord_t pos_y = pos_p->y;
+    uint8_t letter_w = lv_font_get_real_width(font_p, letter);
+    uint8_t letter_h = lv_font_get_height(font_p);
+    uint8_t bpp = lv_font_get_bpp(font_p, letter);  /*Bit per pixel (1,2, 4 or 8)*/
+    const uint8_t * bpp_opa_table;
+    uint8_t mask_init;
+    uint8_t mask;
+
+    if(lv_font_is_monospace(font_p, letter)) {
+        pos_x += (lv_font_get_width(font_p, letter) - letter_w) / 2;
+    }
+
+
+    switch(bpp) {
+        case 1:
+            bpp_opa_table = bpp1_opa_table;
+            mask_init = 0x80;
+            break;
+        case 2:
+            bpp_opa_table = bpp2_opa_table;
+            mask_init = 0xC0;
+            break;
+        case 4:
+            bpp_opa_table = bpp4_opa_table;
+            mask_init = 0xF0;
+            break;
+        case 8:
+            bpp_opa_table = NULL;
+            mask_init = 0xFF;
+            break;             /*No opa table, pixel value will be used directly*/
+        default:
+            return;        /*Invalid bpp. Can't render the letter*/
+    }
+
+    const uint8_t * map_p = lv_font_get_bitmap(font_p, letter);
+
+    if(map_p == NULL) return;
+
+    /*If the letter is completely out of mask don't draw it */
+    if(pos_x + letter_w < mask_p->x1 || pos_x > mask_p->x2 ||
+            pos_y + letter_h < mask_p->y1 || pos_y > mask_p->y2) return;
+
+    lv_vdb_t * vdb_p = lv_vdb_get();
+    if(!vdb_p) {
+        LV_LOG_WARN("Invalid VDB pointer");
+        return;
+    }
+
+    lv_coord_t vdb_width = lv_area_get_width(&vdb_p->area);
+    lv_color_t * vdb_buf_tmp = vdb_p->buf;
+    lv_coord_t col, row;
+    uint8_t col_bit;
+    uint8_t col_byte_cnt;
+    uint8_t width_byte_scr = letter_w >> 3;      /*Width in bytes (on the screen finally) (e.g. w = 11 -> 2 bytes wide)*/
+    if(letter_w & 0x7) width_byte_scr++;
+    uint8_t width_byte_bpp = (letter_w * bpp) >> 3;    /*Letter width in byte. Real width in the font*/
+    if((letter_w * bpp) & 0x7) width_byte_bpp++;
+
+    /* Calculate the col/row start/end on the map*/
+    lv_coord_t col_start = pos_x >= mask_p->x1 ? 0 : mask_p->x1 - pos_x;
+    lv_coord_t col_end = pos_x + letter_w <= mask_p->x2 ? letter_w : mask_p->x2 - pos_x + 1;
+    lv_coord_t row_start = pos_y >= mask_p->y1 ? 0 : mask_p->y1 - pos_y;
+    lv_coord_t row_end  = pos_y + letter_h <= mask_p->y2 ? letter_h : mask_p->y2 - pos_y + 1;
+
+    /*Set a pointer on VDB to the first pixel of the letter*/
+    vdb_buf_tmp += ((pos_y - vdb_p->area.y1) * vdb_width)
+                   + pos_x - vdb_p->area.x1;
+
+    /*If the letter is partially out of mask the move there on VDB*/
+    vdb_buf_tmp += (row_start * vdb_width) + col_start;
+
+    /*Move on the map too*/
+    map_p += (row_start * width_byte_bpp) + ((col_start * bpp) >> 3);
+
+    lv_disp_t * disp = lv_disp_get_active();
+
+    uint8_t letter_px;
+    lv_opa_t px_opa;
+    for(row = row_start; row < row_end; row ++) {
+        col_byte_cnt = 0;
+        col_bit = (col_start * bpp) % 8;
+        mask = mask_init >> col_bit;
+        for(col = col_start; col < col_end; col ++) {
+            letter_px = (*map_p & mask) >> (8 - col_bit - bpp);
+            if(letter_px != 0) {
+                if(opa == LV_OPA_COVER) {
+                    px_opa = bpp == 8 ? letter_px : bpp_opa_table[letter_px];
+                } else {
+                    px_opa = bpp == 8 ?
+                             (uint16_t)((uint16_t)letter_px * opa) >> 8 :
+                             (uint16_t)((uint16_t)bpp_opa_table[letter_px] * opa) >> 8;
+                }
+
+                if(disp->driver.vdb_wr) {
+                    disp->driver.vdb_wr((uint8_t *)vdb_p->buf, vdb_width,
+                                        (col + pos_x) - vdb_p->area.x1, (row + pos_y) - vdb_p->area.y1,
+                                        color, px_opa);
+                } else {
+#if LV_COLOR_SCREEN_TRANSP == 0
+                    *vdb_buf_tmp = lv_color_mix(color, *vdb_buf_tmp, px_opa);
+#else
+                    *vdb_buf_tmp = color_mix_2_alpha(*vdb_buf_tmp, (*vdb_buf_tmp).alpha, color, px_opa);
+#endif
+                }
+            }
+
+            vdb_buf_tmp++;
+
+            if(col_bit < 8 - bpp) {
+                col_bit += bpp;
+                mask = mask >> bpp;
+            } else {
+                col_bit = 0;
+                col_byte_cnt ++;
+                mask = mask_init;
+                map_p ++;
+            }
+        }
+
+        map_p += (width_byte_bpp) - col_byte_cnt;
+        vdb_buf_tmp += vdb_width  - (col_end - col_start); /*Next row in VDB*/
+    }
+}
+
+/**
+ * Draw a color map to the display (image)
+ * @param cords_p coordinates the color map
+ * @param mask_p the map will drawn only on this area  (truncated to VDB area)
+ * @param map_p pointer to a lv_color_t array
+ * @param opa opacity of the map
+ * @param chroma_keyed true: enable transparency of LV_IMG_LV_COLOR_TRANSP color pixels
+ * @param alpha_byte true: extra alpha byte is inserted for every pixel
+ * @param recolor mix the pixels with this color
+ * @param recolor_opa the intense of recoloring
+ */
+void lv_vmap(const lv_area_t * cords_p, const lv_area_t * mask_p,
+             const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
+             lv_color_t recolor, lv_opa_t recolor_opa)
+{
+
+    if(opa < LV_OPA_MIN) return;
+    if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
+
+    lv_area_t masked_a;
+    bool union_ok;
+    lv_vdb_t * vdb_p = lv_vdb_get();
+    if(!vdb_p) {
+        LV_LOG_WARN("Invalid VDB pointer");
+        return;
+    }
+
+    /*Get the union of map size and mask*/
+    /* The mask is already truncated to the vdb size
+    * in 'lv_refr_area_with_vdb' function */
+    union_ok = lv_area_intersect(&masked_a, cords_p, mask_p);
+
+    /*If there are common part of the three area then draw to the vdb*/
+    if(union_ok == false)  return;
+
+    /*The pixel size in byte is different if an alpha byte is added too*/
+    uint8_t px_size_byte = alpha_byte ? LV_IMG_PX_SIZE_ALPHA_BYTE : sizeof(lv_color_t);
+
+    /*If the map starts OUT of the masked area then calc. the first pixel*/
+    lv_coord_t map_width = lv_area_get_width(cords_p);
+    if(cords_p->y1 < masked_a.y1) {
+        map_p += (uint32_t) map_width * ((masked_a.y1 - cords_p->y1)) * px_size_byte;
+    }
+    if(cords_p->x1 < masked_a.x1) {
+        map_p += (masked_a.x1 - cords_p->x1) * px_size_byte;
+    }
+
+    /*Stores coordinates relative to the current VDB*/
+    masked_a.x1 = masked_a.x1 - vdb_p->area.x1;
+    masked_a.y1 = masked_a.y1 - vdb_p->area.y1;
+    masked_a.x2 = masked_a.x2 - vdb_p->area.x1;
+    masked_a.y2 = masked_a.y2 - vdb_p->area.y1;
+
+    lv_coord_t vdb_width = lv_area_get_width(&vdb_p->area);
+    lv_color_t * vdb_buf_tmp = vdb_p->buf;
+    vdb_buf_tmp += (uint32_t) vdb_width * masked_a.y1; /*Move to the first row*/
+    vdb_buf_tmp += (uint32_t) masked_a.x1; /*Move to the first col*/
+
+    lv_coord_t row;
+    lv_coord_t map_useful_w = lv_area_get_width(&masked_a);
+
+    lv_disp_t * disp = lv_disp_get_active();
+
+    /*The simplest case just copy the pixels into the VDB*/
+    if(chroma_key == false && alpha_byte == false && opa == LV_OPA_COVER && recolor_opa == LV_OPA_TRANSP) {
+
+        /*Use the custom VDB write function is exists*/
+        if(disp->driver.vdb_wr) {
+            lv_coord_t col;
+            for(row = masked_a.y1; row <= masked_a.y2; row++) {
+                for(col = 0; col < map_useful_w; col++) {
+                    lv_color_t px_color = *((lv_color_t *)&map_p[(uint32_t)col * px_size_byte]);
+                    disp->driver.vdb_wr((uint8_t *)vdb_p->buf, vdb_width, col + masked_a.x1, row, px_color, opa);
+                }
+                map_p += map_width * px_size_byte;  /*Next row on the map*/
+            }
+        }
+        /*Normal native VDB*/
+        else {
+            for(row = masked_a.y1; row <= masked_a.y2; row++) {
+#if USE_LV_GPU
+                if(lv_disp_is_mem_blend_supported() == false) {
+                    sw_mem_blend(vdb_buf_tmp, (lv_color_t *)map_p, map_useful_w, opa);
+                } else {
+                    lv_disp_mem_blend(vdb_buf_tmp, (lv_color_t *)map_p, map_useful_w, opa);
+                }
+#else
+                sw_mem_blend(vdb_buf_tmp, (lv_color_t *)map_p, map_useful_w, opa);
+#endif
+                map_p += map_width * px_size_byte;               /*Next row on the map*/
+                vdb_buf_tmp += vdb_width;                        /*Next row on the VDB*/
+            }
+        }
+    }
+
+    /*In the other cases every pixel need to be checked one-by-one*/
+    else {
+        lv_color_t chroma_key_color = LV_COLOR_TRANSP;
+        lv_coord_t col;
+        lv_color_t last_img_px = LV_COLOR_BLACK;
+        lv_color_t recolored_px = lv_color_mix(recolor, last_img_px, recolor_opa);
+        for(row = masked_a.y1; row <= masked_a.y2; row++) {
+            for(col = 0; col < map_useful_w; col++) {
+                lv_opa_t opa_result = opa;
+                uint8_t * px_color_p = (uint8_t *) &map_p[(uint32_t)col * px_size_byte];
+                lv_color_t px_color;
+
+                /*Calculate with the pixel level alpha*/
+                if(alpha_byte) {
+#if LV_COLOR_DEPTH == 8 || LV_COLOR_DEPTH == 1
+                    px_color.full = px_color_p[0];
+#elif LV_COLOR_DEPTH == 16
+                    /*Because of Alpha byte 16 bit color can start on odd address which can cause crash*/
+                    px_color.full = px_color_p[0] + (px_color_p[1] << 8);
+#elif LV_COLOR_DEPTH == 32
+                    px_color = *((lv_color_t *)px_color_p);
+#endif
+                    lv_opa_t px_opa = *(px_color_p + LV_IMG_PX_SIZE_ALPHA_BYTE - 1);
+                    if(px_opa == LV_OPA_TRANSP) continue;
+                    else if(px_opa != LV_OPA_COVER) opa_result = (uint32_t)((uint32_t)px_opa * opa_result) >> 8;
+                } else {
+                    px_color = *((lv_color_t *)px_color_p);
+                }
+
+                /*Handle chroma key*/
+                if(chroma_key && px_color.full == chroma_key_color.full) continue;
+
+                /*Re-color the pixel if required*/
+                if(recolor_opa != LV_OPA_TRANSP) {
+                    if(last_img_px.full != px_color.full) {     /*Minor acceleration: calculate only for new colors (save the last)*/
+                        last_img_px = px_color;
+                        recolored_px = lv_color_mix(recolor, last_img_px, recolor_opa);
+                    }
+                    /*Handle custom VDB write is present*/
+                    if(disp->driver.vdb_wr) {
+                        disp->driver.vdb_wr((uint8_t *)vdb_p->buf, vdb_width, col + masked_a.x1, row, recolored_px, opa_result);
+                    }
+                    /*Normal native VDB write*/
+                    else {
+                        if(opa_result == LV_OPA_COVER) vdb_buf_tmp[col].full = recolored_px.full;
+                        else vdb_buf_tmp[col] = lv_color_mix(recolored_px, vdb_buf_tmp[col], opa_result);
+                    }
+                } else {
+                    /*Handle custom VDB write is present*/
+                    if(disp->driver.vdb_wr) {
+                        disp->driver.vdb_wr((uint8_t *)vdb_p->buf, vdb_width, col + masked_a.x1, row, px_color, opa_result);
+                    }
+                    /*Normal native VDB write*/
+                    else {
+                        if(opa_result == LV_OPA_COVER) vdb_buf_tmp[col] = px_color;
+                        else {
+#if LV_COLOR_SCREEN_TRANSP == 0
+                            vdb_buf_tmp[col] = lv_color_mix(px_color, vdb_buf_tmp[col], opa_result);
+#else
+                            vdb_buf_tmp[col] = color_mix_2_alpha(vdb_buf_tmp[col], vdb_buf_tmp[col].alpha, px_color,  opa_result);
+#endif
+                        }
+                    }
+                }
+            }
+
+            map_p += map_width * px_size_byte;  /*Next row on the map*/
+            vdb_buf_tmp += vdb_width;           /*Next row on the VDB*/
+        }
+    }
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+/**
+ * Blend pixels to destination memory using opacity
+ * @param dest a memory address. Copy 'src' here.
+ * @param src pointer to pixel map. Copy it to 'dest'.
+ * @param length number of pixels in 'src'
+ * @param opa opacity (0, LV_OPA_TRANSP: transparent ... 255, LV_OPA_COVER, fully cover)
+ */
+static void sw_mem_blend(lv_color_t * dest, const lv_color_t * src, uint32_t length, lv_opa_t opa)
+{
+    if(opa == LV_OPA_COVER) {
+        memcpy(dest, src, length * sizeof(lv_color_t));
+    } else {
+        uint32_t col;
+        for(col = 0; col < length; col++) {
+            dest[col] = lv_color_mix(src[col], dest[col], opa);
+        }
+    }
+}
+
+/**
+ *
+ * @param mem_area coordinates of 'mem' memory area
+ * @param mem a memory address. Considered to a rectangular window according to 'mem_area'
+ * @param fill_area coordinates of an area to fill. Relative to 'mem_area'.
+ * @param color fill color
+ * @param opa opacity (0, LV_OPA_TRANSP: transparent ... 255, LV_OPA_COVER, fully cover)
+ */
+static void sw_color_fill(lv_area_t * mem_area, lv_color_t * mem, const lv_area_t * fill_area, lv_color_t color, lv_opa_t opa)
+{
+    /*Set all row in vdb to the given color*/
+    lv_coord_t row;
+    lv_coord_t col;
+    lv_coord_t mem_width = lv_area_get_width(mem_area);
+
+    lv_disp_t * disp = lv_disp_get_active();
+    if(disp->driver.vdb_wr) {
+        for(col = fill_area->x1; col <= fill_area->x2; col++) {
+            for(row = fill_area->y1; row <= fill_area->y2; row++) {
+                disp->driver.vdb_wr((uint8_t *)mem, mem_width, col, row, color, opa);
+            }
+        }
+    } else {
+        mem += fill_area->y1 * mem_width;  /*Go to the first row*/
+
+        /*Run simpler function without opacity*/
+        if(opa == LV_OPA_COVER) {
+
+            /*Fill the first row with 'color'*/
+            for(col = fill_area->x1; col <= fill_area->x2; col++) {
+                mem[col] = color;
+            }
+
+            /*Copy the first row to all other rows*/
+            lv_color_t * mem_first = &mem[fill_area->x1];
+            lv_coord_t copy_size = (fill_area->x2 - fill_area->x1 + 1) * sizeof(lv_color_t);
+            mem += mem_width;
+
+            for(row = fill_area->y1 + 1; row <= fill_area->y2; row++) {
+                memcpy(&mem[fill_area->x1], mem_first, copy_size);
+                mem += mem_width;
+            }
+        }
+        /*Calculate with alpha too*/
+        else {
+
+#if LV_COLOR_SCREEN_TRANSP == 0
+            lv_color_t bg_tmp = LV_COLOR_BLACK;
+            lv_color_t opa_tmp = lv_color_mix(color, bg_tmp, opa);
+#endif
+            for(row = fill_area->y1; row <= fill_area->y2; row++) {
+                for(col = fill_area->x1; col <= fill_area->x2; col++) {
+#if LV_COLOR_SCREEN_TRANSP == 0
+                    /*If the bg color changed recalculate the result color*/
+                    if(mem[col].full != bg_tmp.full) {
+                        bg_tmp = mem[col];
+                        opa_tmp = lv_color_mix(color, bg_tmp, opa);
+                    }
+
+                    mem[col] = opa_tmp;
+
+#else
+                    mem[col] = color_mix_2_alpha(mem[col], mem[col].alpha, color, opa);
+#endif
+                }
+                mem += mem_width;
+            }
+        }
+    }
+}
+
+#if LV_COLOR_SCREEN_TRANSP
+
+/**
+ * Mix two colors. Both color can have alpha value. It requires ARGB888 colors.
+ * @param bg_color background color
+ * @param bg_opa alpha of the background color
+ * @param fg_color foreground color
+ * @param fg_opa alpha of the foreground color
+ * @return the mixed color. the alpha channel (color.alpha) contains the result alpha
+ */
+static inline lv_color_t color_mix_2_alpha(lv_color_t bg_color, lv_opa_t bg_opa, lv_color_t fg_color, lv_opa_t fg_opa)
+{
+    /* Pick the foreground if it's fully opaque or the Background is fully transparent*/
+    if(fg_opa == LV_OPA_COVER && bg_opa <= LV_OPA_MIN) {
+        fg_color.alpha = fg_opa;
+        return fg_color;
+    }
+    /*Transparent foreground: use the Background*/
+    else if(fg_opa <= LV_OPA_MIN) {
+        return bg_color;
+    }
+    /*Opaque background: use simple mix*/
+    else if(bg_opa >= LV_OPA_MAX) {
+        return lv_color_mix(fg_color, bg_color, fg_opa);
+    }
+    /*Both colors have alpha. Expensive calculation need to be applied*/
+    else {
+        /*Save the parameters and the result. If they will be asked again don't compute again*/
+        static lv_opa_t fg_opa_save = 0;
+        static lv_opa_t bg_opa_save = 0;
+        static lv_color_t c = {{0}};
+
+        if(fg_opa != fg_opa_save || bg_opa != bg_opa_save) {
+            fg_opa_save = fg_opa;
+            bg_opa_save = bg_opa;
+            /*Info: https://en.wikipedia.org/wiki/Alpha_compositing#Analytical_derivation_of_the_over_operator*/
+            lv_opa_t alpha_res = 255 - ((uint16_t)((uint16_t)(255 - fg_opa) * (255 - bg_opa)) >> 8);
+            if(alpha_res == 0) {
+                while(1);
+            }
+            lv_opa_t ratio = (uint16_t)((uint16_t) fg_opa * 255) / alpha_res;
+            c = lv_color_mix(fg_color, bg_color, ratio);
+            c.alpha = alpha_res;
+        }
+        return c;
+
+    }
+}
+#endif /*LV_COLOR_SCREEN_TRANSP*/
+
+#endif

bdk/libs/lvgl/lv_draw/lv_draw_vbasic.h

@@ -0,0 +1,89 @@
+/**
+ * @file lv_draw_vbasic.h
+ *
+ */
+
+#ifndef LV_DRAW_VBASIC_H
+#define LV_DRAW_VBASIC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#ifdef LV_CONF_INCLUDE_SIMPLE
+#include "lv_conf.h"
+#else
+#include "../../lv_conf.h"
+#endif
+
+#if LV_VDB_SIZE != 0
+
+#include "../lv_misc/lv_color.h"
+#include "../lv_misc/lv_area.h"
+#include "../lv_misc/lv_font.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+void lv_vpx(lv_coord_t x, lv_coord_t y, const lv_area_t * mask_p, lv_color_t color, lv_opa_t opa);
+/**
+ * Fill an area in the Virtual Display Buffer
+ * @param cords_p coordinates of the area to fill
+ * @param mask_p fill only o this mask
+ * @param color fill color
+ * @param opa opacity of the area (0..255)
+ */
+void lv_vfill(const lv_area_t * cords_p, const lv_area_t * mask_p,
+              lv_color_t color, lv_opa_t opa);
+
+/**
+ * Draw a letter in the Virtual Display Buffer
+ * @param pos_p left-top coordinate of the latter
+ * @param mask_p the letter will be drawn only on this area
+ * @param font_p pointer to font
+ * @param letter a letter to draw
+ * @param color color of letter
+ * @param opa opacity of letter (0..255)
+ */
+void lv_vletter(const lv_point_t * pos_p, const lv_area_t * mask_p,
+                const lv_font_t * font_p, uint32_t letter,
+                lv_color_t color, lv_opa_t opa);
+
+/**
+ * Draw a color map to the display (image)
+ * @param cords_p coordinates the color map
+ * @param mask_p the map will drawn only on this area  (truncated to VDB area)
+ * @param map_p pointer to a lv_color_t array
+ * @param opa opacity of the map
+ * @param chroma_keyed true: enable transparency of LV_IMG_LV_COLOR_TRANSP color pixels
+ * @param alpha_byte true: extra alpha byte is inserted for every pixel
+ * @param recolor mix the pixels with this color
+ * @param recolor_opa the intense of recoloring
+ */
+void lv_vmap(const lv_area_t * cords_p, const lv_area_t * mask_p,
+             const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
+             lv_color_t recolor, lv_opa_t recolor_opa);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif  /*LV_VDB_SIZE != 0*/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif  /*LV_DRAW_RBASIC_H*/