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* fix outdated comments, correct do/while bug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/jpegdec_decode_service.hpp

@@ -0,0 +1,34 @@
+/*
+ * 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 {
+
+    class DecodeService final : public sf::IServiceObject {
+        protected:
+            enum class CommandId {
+                DecodeJpeg  = 3001,
+            };
+        public:
+            /* Actual commands. */
+            virtual Result DecodeJpeg(const sf::OutNonSecureBuffer &out, const sf::InBuffer &in, u32 width, u32 height, const CapsScreenShotDecodeOption &opts);
+        public:
+            DEFINE_SERVICE_DISPATCH_TABLE {
+                MAKE_SERVICE_COMMAND_META(DecodeJpeg)
+            };
+    };
+}