jpegdec reimplementation (#912)

* add jpegdec reimplementation

* reduce work memory

* fix color space

* jpegdec: cleanup results to use atmosphere style

* fix outdated comments, correct do/while bug

Co-authored-by: Michael Scire <SciresM@gmail.com>

stratosphere/jpegdec/source/impl/jpegdec_turbo.hpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere.hpp>
+
+namespace ams::jpegdec::impl {
+
+    struct DecodeInput {
+        const u8 *jpeg;
+        size_t jpeg_size;
+        u32 width;
+        u32 height;
+        bool fancy_upsampling;
+        bool block_smoothing;
+    };
+
+    struct DecodeOutput {
+        u32 *width;
+        u32 *height;
+        u8 *bmp;
+        size_t bmp_size;
+    };
+
+    struct Dimensions {
+        u32 width, height;
+    };
+
+    Result DecodeJpeg(DecodeOutput &out, const DecodeInput &in, u8 *work, size_t work_size);
+
+}