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* fix outdated comments, correct do/while bug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>

Makefile

@@ -63,6 +63,7 @@ dist-no-debug: all
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/contents/0100000000000034
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/contents/0100000000000036
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/contents/0100000000000037
+	mkdir -p atmosphere-$(AMSVER)/atmosphere/contents/010000000000003C
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/fatal_errors
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/config_templates
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/config
@@ -88,6 +89,7 @@ dist-no-debug: all
 	cp stratosphere/fatal/fatal.nsp atmosphere-$(AMSVER)/atmosphere/contents/0100000000000034/exefs.nsp
 	cp stratosphere/creport/creport.nsp atmosphere-$(AMSVER)/atmosphere/contents/0100000000000036/exefs.nsp
 	cp stratosphere/ro/ro.nsp atmosphere-$(AMSVER)/atmosphere/contents/0100000000000037/exefs.nsp
+	cp stratosphere/jpedec/jpedec.nsp atmosphere-$(AMSVER)/atmosphere/contents/010000000000003C/exefs.nsp
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/contents/0100000000000032/flags
 	touch atmosphere-$(AMSVER)/atmosphere/contents/0100000000000032/flags/boot2.flag
 	mkdir -p atmosphere-$(AMSVER)/atmosphere/contents/0100000000000037/flags
@@ -136,6 +138,7 @@ dist: dist-no-debug
 	cp stratosphere/sm/sm.elf atmosphere-$(AMSVER)-debug/sm.elf
 	cp stratosphere/spl/spl.elf atmosphere-$(AMSVER)-debug/spl.elf
 	cp stratosphere/erpt/erpt.elf atmosphere-$(AMSVER)-debug/erpt.elf
+	cp stratosphere/jpegdec/jpegdec.elf atmosphere-$(AMSVER)-debug/jpegdec.elf
 	cd atmosphere-$(AMSVER)-debug; zip -r ../atmosphere-$(AMSVER)-debug.zip ./*; cd ../;
 	rm -r atmosphere-$(AMSVER)-debug
 	mv atmosphere-$(AMSVER)-debug.zip out/atmosphere-$(AMSVER)-debug.zip

libraries/libstratosphere/include/stratosphere/ams/impl/ams_system_thread_definitions.hpp

@@ -102,6 +102,9 @@ namespace ams::impl {
     AMS_DEFINE_SYSTEM_THREAD(21, erpt, Main);
     AMS_DEFINE_SYSTEM_THREAD(21, erpt, IpcServer);
 
+    /* jpegdec. */
+    AMS_DEFINE_SYSTEM_THREAD(21, jpegdec, Main);
+
     /* pgl. */
     AMS_DEFINE_SYSTEM_THREAD(21, pgl, Main);
     AMS_DEFINE_SYSTEM_THREAD(21, pgl, ProcessControlTask);

libraries/libvapours/include/vapours/results.hpp

@@ -24,6 +24,7 @@
 
 /* Official. */
 #include <vapours/results/cal_results.hpp>
+#include <vapours/results/capsrv_results.hpp>
 #include <vapours/results/creport_results.hpp>
 #include <vapours/results/debug_results.hpp>
 #include <vapours/results/dmnt_results.hpp>

libraries/libvapours/include/vapours/results/capsrv_results.hpp

@@ -0,0 +1,91 @@
+/*
+ * 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 <vapours/results/results_common.hpp>
+
+namespace ams::capsrv {
+
+    R_DEFINE_NAMESPACE_RESULT_MODULE(206);
+
+    R_DEFINE_ERROR_RANGE(AlbumError, 2, 99);
+        R_DEFINE_ERROR_RESULT(AlbumWorkMemoryError,                     3);
+
+        R_DEFINE_ERROR_RESULT(AlbumAlreadyOpened,                       7);
+        R_DEFINE_ERROR_RESULT(AlbumOutOfRange,                          8);
+
+        R_DEFINE_ERROR_RANGE(AlbumInvalidFileId, 10, 19);
+            R_DEFINE_ERROR_RESULT(AlbumInvalidApplicationId,            11);
+            R_DEFINE_ERROR_RESULT(AlbumInvalidTimestamp,                12);
+            R_DEFINE_ERROR_RESULT(AlbumInvalidStorage,                  13);
+            R_DEFINE_ERROR_RESULT(AlbumInvalidFileContents,             14);
+
+        R_DEFINE_ERROR_RESULT(AlbumIsNotMounted,                        21);
+        R_DEFINE_ERROR_RESULT(AlbumIsFull,                              22);
+        R_DEFINE_ERROR_RESULT(AlbumFileNotFound,                        23);
+        R_DEFINE_ERROR_RESULT(AlbumInvalidFileData,                     24);
+        R_DEFINE_ERROR_RESULT(AlbumFileCountLimit,                      25);
+        R_DEFINE_ERROR_RESULT(AlbumFileNoThumbnail,                     26);
+
+        R_DEFINE_ERROR_RESULT(AlbumReadBufferShortage,                  30);
+
+        R_DEFINE_ERROR_RANGE(AlbumFileSystemError, 90, 99);
+            R_DEFINE_ERROR_RANGE(AlbumAccessCorrupted, 94, 96);
+                R_DEFINE_ERROR_RESULT(AlbumDestinationAccessCorrupted,  96);
+
+    R_DEFINE_ERROR_RANGE(ControlError, 800, 899);
+    R_DEFINE_ERROR_RESULT(ControlResourceLimit, 820);
+    R_DEFINE_ERROR_RESULT(ControlNotOpened,     822);
+
+    R_DEFINE_ERROR_RESULT(NotSupported, 1023);
+
+    R_DEFINE_ERROR_RANGE(InternalError, 1024, 2047);
+        R_DEFINE_ERROR_RESULT(InternalJpegWorkMemoryShortage,   1212);
+
+        R_DEFINE_ERROR_RANGE(InternalFileDataVerificationError, 1300, 1399);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationEmptyFileData,                1301);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationExifExtractionFailed,         1302);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationExifAnalyzationFailed,        1303);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationDateTimeExtractionFailed,     1304);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationInvalidDateTimeLength,        1305);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationInconsistentDateTime,         1306);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationMakerNoteExtractionFailed,    1307);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationInconsistentApplicationId,    1308);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationInconsistentSignature,        1309);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationUnsupportedOrientation,       1310);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationInvalidDataDimension,         1311);
+            R_DEFINE_ERROR_RESULT(InternalFileDataVerificationInconsistentOrientation,      1312);
+
+        R_DEFINE_ERROR_RANGE(InternalAlbumLimitationError, 1400, 1499);
+            R_DEFINE_ERROR_RESULT(InternalAlbumLimitationFileCountLimit,    1401);
+
+        R_DEFINE_ERROR_RANGE(InternalSignatureError, 1500, 1599);
+        R_DEFINE_ERROR_RESULT(InternalSignatureExifExtractionFailed,        1501);
+        R_DEFINE_ERROR_RESULT(InternalSignatureMakerNoteExtractionFailed,   1502);
+
+        R_DEFINE_ERROR_RANGE(InternalAlbumSessionError, 1700, 1799);
+            R_DEFINE_ERROR_RESULT(InternalAlbumLimitationSessionCountLimit, 1701);
+
+        R_DEFINE_ERROR_RANGE(InternalAlbumTemporaryFileError, 1900, 1999);
+            R_DEFINE_ERROR_RESULT(InternalAlbumTemporaryFileCountLimit,             1901);
+            R_DEFINE_ERROR_RESULT(InternalAlbumTemporaryFileCreateError,            1902);
+            R_DEFINE_ERROR_RESULT(InternalAlbumTemporaryFileCreateRetryCountLimit,  1903);
+            R_DEFINE_ERROR_RESULT(InternalAlbumTemporaryFileOpenError,              1904);
+            R_DEFINE_ERROR_RESULT(InternalAlbumTemporaryFileGetFileSizeError,       1905);
+            R_DEFINE_ERROR_RESULT(InternalAlbumTemporaryFileSetFileSizeError,       1906);
+            R_DEFINE_ERROR_RESULT(InternalAlbumTemporaryFileReadFileError,          1907);
+            R_DEFINE_ERROR_RESULT(InternalAlbumTemporaryFileWriteFileError,         1908);
+
+}

stratosphere/Makefile

@@ -1,4 +1,4 @@
-MODULES := loader ncm pm sm boot ams_mitm spl eclct.stub ro creport fatal dmnt boot2 erpt
+MODULES := loader ncm pm sm boot ams_mitm spl eclct.stub ro creport fatal dmnt boot2 erpt jpegdec
 
 SUBFOLDERS := $(MODULES)
 

stratosphere/jpegdec/Makefile

@@ -0,0 +1,132 @@
+#---------------------------------------------------------------------------------
+# pull in common stratosphere sysmodule configuration
+#---------------------------------------------------------------------------------
+include $(dir $(abspath $(lastword $(MAKEFILE_LIST))))/../../libraries/config/templates/stratosphere.mk
+
+#---------------------------------------------------------------------------------
+# jpegdec uses libjpeg.
+#---------------------------------------------------------------------------------
+LIBS     +=	-ljpeg
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export OUTPUT	:=	$(CURDIR)/$(TARGET)
+export TOPDIR	:=	$(CURDIR)
+
+export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
+			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
+
+export DEPSDIR	:=	$(CURDIR)/$(BUILD)
+
+CFILES      :=	$(foreach dir,$(SOURCES),$(filter-out $(notdir $(wildcard $(dir)/*.arch.*.c)) $(notdir $(wildcard $(dir)/*.board.*.c)) $(notdir $(wildcard $(dir)/*.os.*.c)), \
+                                                      $(notdir $(wildcard $(dir)/*.c))))
+CFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.arch.$(ATMOSPHERE_ARCH_NAME).c)))
+CFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.board.$(ATMOSPHERE_BOARD_NAME).c)))
+CFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.os.$(ATMOSPHERE_OS_NAME).c)))
+
+CPPFILES    :=	$(foreach dir,$(SOURCES),$(filter-out $(notdir $(wildcard $(dir)/*.arch.*.cpp)) $(notdir $(wildcard $(dir)/*.board.*.cpp)) $(notdir $(wildcard $(dir)/*.os.*.cpp)), \
+                                                      $(notdir $(wildcard $(dir)/*.cpp))))
+CPPFILES    +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.arch.$(ATMOSPHERE_ARCH_NAME).cpp)))
+CPPFILES    +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.board.$(ATMOSPHERE_BOARD_NAME).cpp)))
+CPPFILES    +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.os.$(ATMOSPHERE_OS_NAME).cpp)))
+
+SFILES      :=	$(foreach dir,$(SOURCES),$(filter-out $(notdir $(wildcard $(dir)/*.arch.*.s)) $(notdir $(wildcard $(dir)/*.board.*.s)) $(notdir $(wildcard $(dir)/*.os.*.s)), \
+                                                      $(notdir $(wildcard $(dir)/*.s))))
+SFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.arch.$(ATMOSPHERE_ARCH_NAME).s)))
+SFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.board.$(ATMOSPHERE_BOARD_NAME).s)))
+SFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.os.$(ATMOSPHERE_OS_NAME).s)))
+
+BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES	:=	$(addsuffix .o,$(BINFILES)) \
+			$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+
+export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+			-I$(CURDIR)/$(BUILD)
+
+export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+export BUILD_EXEFS_SRC := $(TOPDIR)/$(EXEFS_SRC)
+
+ifeq ($(strip $(CONFIG_JSON)),)
+	jsons := $(wildcard *.json)
+	ifneq (,$(findstring $(TARGET).json,$(jsons)))
+		export APP_JSON := $(TOPDIR)/$(TARGET).json
+	else
+		ifneq (,$(findstring config.json,$(jsons)))
+			export APP_JSON := $(TOPDIR)/config.json
+		endif
+	endif
+else
+	export APP_JSON := $(TOPDIR)/$(CONFIG_JSON)
+endif
+
+.PHONY: $(BUILD) clean all
+
+#---------------------------------------------------------------------------------
+all: $(BUILD)
+
+$(BUILD):
+	@[ -d $@ ] || mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) $(TARGET).nsp $(TARGET).npdm $(TARGET).nso $(TARGET).elf
+
+
+#---------------------------------------------------------------------------------
+else
+.PHONY:	all
+
+DEPENDS	:=	$(OFILES:.o=.d)
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+all	:	$(OUTPUT).nsp
+
+ifeq ($(strip $(APP_JSON)),)
+$(OUTPUT).nsp	:	$(OUTPUT).nso
+else
+$(OUTPUT).nsp	:	$(OUTPUT).nso $(OUTPUT).npdm
+endif
+
+$(OUTPUT).nso	:	$(OUTPUT).elf
+
+$(OUTPUT).elf	:	$(OFILES)
+
+#---------------------------------------------------------------------------------
+# you need a rule like this for each extension you use as binary data
+#---------------------------------------------------------------------------------
+%.bin.o	:	%.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+-include $(DEPENDS)
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------

stratosphere/jpegdec/jpegdec.json

@@ -0,0 +1,97 @@
+{
+	"name":	"jpegdec",
+	"title_id":	"0x010000000000003c",
+	"title_id_range_min":	"0x010000000000003c",
+	"title_id_range_max":	"0x010000000000003c",
+	"main_thread_stack_size":	"0x00004000",
+	"main_thread_priority":	49,
+	"default_cpu_id":	3,
+	"process_category":	0,
+	"is_retail":	true,
+	"pool_partition":	2,
+	"is_64_bit":	true,
+	"address_space_type":	3,
+	"filesystem_access":	{
+		"permissions":	"0x0"
+	},
+	"service_access":	["fatal:u", "lm"],
+	"service_host":	["caps:dc"],
+	"kernel_capabilities":	[{
+			"type":	"kernel_flags",
+			"value":	{
+				"highest_thread_priority":	63,
+				"lowest_thread_priority":	24,
+				"lowest_cpu_id":	3,
+				"highest_cpu_id":	3
+			}
+		}, {
+			"type":	"syscalls",
+			"value":	{
+				"svcSetHeapSize":    "0x01",
+				"svcSetMemoryPermission":    "0x02",
+				"svcSetMemoryAttribute":    "0x03",
+				"svcMapMemory":    "0x04",
+				"svcUnmapMemory":    "0x05",
+				"svcQueryMemory":    "0x06",
+				"svcExitProcess":    "0x07",
+				"svcCreateThread":    "0x08",
+				"svcStartThread":    "0x09",
+				"svcExitThread":    "0x0a",
+				"svcSleepThread":    "0x0b",
+				"svcGetThreadPriority":    "0x0c",
+				"svcSetThreadPriority":    "0x0d",
+				"svcGetThreadCoreMask":    "0x0e",
+				"svcSetThreadCoreMask":    "0x0f",
+				"svcGetCurrentProcessorNumber":    "0x10",
+				"svcSignalEvent":    "0x11",
+				"svcClearEvent":    "0x12",
+				"svcMapSharedMemory":    "0x13",
+				"svcUnmapSharedMemory":    "0x14",
+				"svcCreateTransferMemory":    "0x15",
+				"svcCloseHandle":    "0x16",
+				"svcResetSignal":    "0x17",
+				"svcWaitSynchronization":    "0x18",
+				"svcCancelSynchronization":    "0x19",
+				"svcArbitrateLock":    "0x1a",
+				"svcArbitrateUnlock":    "0x1b",
+				"svcWaitProcessWideKeyAtomic":    "0x1c",
+				"svcSignalProcessWideKey":    "0x1d",
+				"svcGetSystemTick":    "0x1e",
+				"svcConnectToNamedPort":    "0x1f",
+				"svcSendSyncRequestLight":    "0x20",
+				"svcSendSyncRequest":    "0x21",
+				"svcSendSyncRequestWithUserBuffer":    "0x22",
+				"svcSendAsyncRequestWithUserBuffer":    "0x23",
+				"svcGetProcessId":    "0x24",
+				"svcGetThreadId":    "0x25",
+				"svcBreak":    "0x26",
+				"svcOutputDebugString":    "0x27",
+				"svcReturnFromException":    "0x28",
+				"svcGetInfo":    "0x29",
+				"svcWaitForAddress":    "0x34",
+				"svcSignalToAddress":    "0x35",
+				"svcCreateSession":    "0x40",
+				"svcAcceptSession":    "0x41",
+				"svcReplyAndReceiveLight":    "0x42",
+				"svcReplyAndReceive":    "0x43",
+				"svcReplyAndReceiveWithUserBuffer":    "0x44",
+				"svcCreateEvent":    "0x45",
+				"svcCreateInterruptEvent":    "0x53",
+				"svcReadWriteRegister":    "0x4E",
+				"svcQueryIoMapping":    "0x55",
+				"svcCreateDeviceAddressSpace":    "0x56",
+				"svcAttachDeviceAddressSpace":    "0x57",
+				"svcDetachDeviceAddressSpace":    "0x58",
+				"svcMapDeviceAddressSpaceAligned":    "0x5a",
+				"svcUnmapDeviceAddressSpace":    "0x5c",
+				"svcGetSystemInfo":    "0x6f",
+				"svcCallSecureMonitor": "0x7F"
+			}
+		}, {
+			"type":	"min_kernel_version",
+			"value":	"0x0030"
+		}, {
+			"type":	"handle_table_size",
+			"value":	16
+		}]
+}

stratosphere/jpegdec/source/impl/jpegdec_turbo.cpp

@@ -0,0 +1,148 @@
+/*
+ * 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/>.
+ */
+#include "jpegdec_turbo.hpp"
+
+#include <jpeglib.h>
+
+namespace ams::jpegdec::impl {
+
+    #define CAPSRV_ABORT_UNLESS(expr) do {                          \
+        const bool __capsrv_assert_res = (expr);                    \
+        AMS_ASSERT(__capsrv_assert_res);                            \
+        AMS_ABORT_UNLESS(__capsrv_assert_res);                      \
+    } while (0)
+
+    #define CAPSRV_ASSERT(expr) do {                                \
+        const bool __capsrv_assert_res = (expr);                    \
+        AMS_ASSERT(__capsrv_assert_res);                            \
+        R_UNLESS(__capsrv_assert_res, capsrv::ResultAlbumError());  \
+    } while (0)
+
+    namespace {
+
+        constexpr size_t LinebufferCount = 4;
+        constexpr size_t ColorComponents = 3;
+
+        constexpr int ImageSizeHorizonalUnit = 0x10;
+        constexpr int ImageSizeVerticalUnit  = 0x4;
+
+        struct RGB {
+            u8 r, g, b;
+        };
+
+        struct RGBX {
+            u8 r, g, b, x;
+        };
+
+        void JpegErrorExit(j_common_ptr cinfo) {
+            /* ? */
+        }
+    }
+
+    Result DecodeJpeg(DecodeOutput &out, const DecodeInput &in, u8 *work, size_t work_size) {
+        CAPSRV_ABORT_UNLESS(util::IsAligned(in.width,  ImageSizeHorizonalUnit));
+        CAPSRV_ABORT_UNLESS(util::IsAligned(in.height, ImageSizeVerticalUnit));
+
+        CAPSRV_ABORT_UNLESS(out.bmp != nullptr);
+        CAPSRV_ABORT_UNLESS(out.bmp_size >= 4 * in.width * in.height);
+
+        CAPSRV_ABORT_UNLESS(out.width != nullptr);
+        CAPSRV_ABORT_UNLESS(out.height != nullptr);
+
+        const size_t linebuffer_size = ColorComponents * in.width;
+        const size_t total_linebuffer_size = LinebufferCount * linebuffer_size;
+        R_UNLESS(work_size >= total_linebuffer_size, capsrv::ResultInternalJpegWorkMemoryShortage());
+
+        jpeg_decompress_struct cinfo;
+        std::memset(&cinfo, 0, sizeof(cinfo));
+
+        jpeg_error_mgr jerr;
+        std::memset(&jerr, 0, sizeof(jerr));
+
+        cinfo.err = jpeg_std_error(&jerr);
+        jerr.error_exit = JpegErrorExit;
+
+        /* TODO: Here Nintendo uses setjmp, on longjmp to error ResultAlbumInvalidFileData is returned.  */
+
+        jpeg_create_decompress(&cinfo);
+
+        ON_SCOPE_EXIT {
+            jpeg_destroy_decompress(&cinfo);
+        };
+
+        jpeg_mem_src(&cinfo, in.jpeg, in.jpeg_size);
+
+        R_UNLESS(jpeg_read_header(&cinfo, true) == JPEG_HEADER_OK,  capsrv::ResultAlbumInvalidFileData());
+
+        R_UNLESS(cinfo.image_width  == in.width,    capsrv::ResultAlbumInvalidFileData());
+        R_UNLESS(cinfo.image_height == in.height,   capsrv::ResultAlbumInvalidFileData());
+
+        cinfo.out_color_space = JCS_RGB;
+        cinfo.dct_method = JDCT_ISLOW;
+        cinfo.do_fancy_upsampling = in.fancy_upsampling;
+        cinfo.do_block_smoothing = in.block_smoothing;
+
+        R_UNLESS(jpeg_start_decompress(&cinfo) == TRUE, capsrv::ResultAlbumInvalidFileData());
+
+        CAPSRV_ASSERT(cinfo.output_width         == in.width);
+        CAPSRV_ASSERT(cinfo.output_height        == in.height);
+        CAPSRV_ASSERT(cinfo.out_color_components == ColorComponents);
+        CAPSRV_ASSERT(cinfo.output_components    == ColorComponents);
+
+        /* Pointer to output. */
+        RGBX *bmp = reinterpret_cast<RGBX *>(out.bmp);
+
+        /* Decode 4 lines at once. */
+        u8 *linebuffer[4] = {
+            work + 0 * linebuffer_size,
+            work + 1 * linebuffer_size,
+            work + 2 * linebuffer_size,
+            work + 3 * linebuffer_size,
+        };
+
+        /* While we still have scanlines, parse! */
+        while (cinfo.output_scanline < cinfo.output_height) {
+            /* Decode scanlines. */
+            int parsed = jpeg_read_scanlines(&cinfo, linebuffer, 4);
+            CAPSRV_ASSERT(parsed <= ImageSizeVerticalUnit);
+
+            /* Line by line */
+            for (int index = 0; index < parsed; index++) {
+                u8 *buffer = linebuffer[index];
+                const RGB* rgb = reinterpret_cast<RGB *>(buffer);
+                for (u32 i = 0; i < in.width; i++) {
+                    /* Fill output. */
+                    bmp->r = rgb->r;
+                    bmp->g = rgb->g;
+                    bmp->b = rgb->b;
+                    bmp->x = 0xFF;
+
+                    /* Traverse buffer. */
+                    bmp++;
+                    rgb++;
+                }
+            }
+        }
+
+        R_UNLESS(jpeg_finish_decompress(&cinfo) == TRUE, capsrv::ResultAlbumInvalidFileData());
+
+        *out.width = cinfo.output_width;
+        *out.height = cinfo.output_height;
+
+        return ResultSuccess();
+    }
+
+}

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);
+
+}

stratosphere/jpegdec/source/jpegdec_decode_service.cpp

@@ -0,0 +1,79 @@
+/*
+ * 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/>.
+ */
+#include "jpegdec_decode_service.hpp"
+#include "impl/jpegdec_turbo.hpp"
+
+namespace ams::jpegdec {
+
+    namespace {
+
+        /* Enough for four linebuffers RGB. */
+        u8 g_workmem[0x3C00];
+
+    }
+
+    Result DecodeService::DecodeJpeg(const sf::OutNonSecureBuffer &out, const sf::InBuffer &in, u32 width, u32 height, const CapsScreenShotDecodeOption &opts) {
+        u8 *bmp = out.GetPointer();
+        size_t bmp_size = out.GetSize();
+        const u8 *jpeg = in.GetPointer();
+        size_t jpeg_size = in.GetSize();
+
+        /* Clear the work memory and out buffer. */
+        std::memset(g_workmem, 0, sizeof(g_workmem));
+        std::memset(bmp, 0, bmp_size);
+
+        /* Clear output memory on decode failure. */
+        auto clear_guard = SCOPE_GUARD { std::memset(bmp, 0, bmp_size); };
+
+        R_UNLESS(util::IsAligned(width, 0x10),   capsrv::ResultAlbumOutOfRange());
+        R_UNLESS(util::IsAligned(height, 0x4),   capsrv::ResultAlbumOutOfRange());
+
+        R_UNLESS(bmp != nullptr,                 capsrv::ResultAlbumReadBufferShortage());
+        R_UNLESS(bmp_size >= 4 * width * height, capsrv::ResultAlbumReadBufferShortage());
+
+        R_UNLESS(jpeg != nullptr,                capsrv::ResultAlbumInvalidFileData());
+        R_UNLESS(jpeg_size != 0,                 capsrv::ResultAlbumInvalidFileData());
+
+        impl::DecodeInput decode_input = {
+            .jpeg = jpeg,
+            .jpeg_size = jpeg_size,
+            .width = width,
+            .height = height,
+            .fancy_upsampling = bool(opts.fancy_upsampling),
+            .block_smoothing = bool(opts.block_smoothing),
+        };
+
+        /* Official software ignores output written to this struct. */
+        impl::Dimensions dims = {};
+
+        impl::DecodeOutput decode_output = {
+            .width = &dims.width,
+            .height = &dims.height,
+            .bmp = bmp,
+            .bmp_size = bmp_size,
+        };
+
+
+        /* Decode the jpeg. */
+        R_TRY(impl::DecodeJpeg(decode_output, decode_input, g_workmem, sizeof(g_workmem)));
+        clear_guard.Cancel();
+
+        /* Clear the work memory. */
+        std::memset(g_workmem, 0, sizeof(g_workmem));
+
+        return ResultSuccess();
+    }
+}

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)
+            };
+    };
+}

stratosphere/jpegdec/source/jpegdec_main.cpp

@@ -0,0 +1,103 @@
+/*
+ * 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/>.
+ */
+#include "jpegdec_decode_service.hpp"
+
+extern "C" {
+    extern u32 __start__;
+
+    u32 __nx_applet_type = AppletType_None;
+
+    #define INNER_HEAP_SIZE 0x18000
+    size_t nx_inner_heap_size = INNER_HEAP_SIZE;
+    char   nx_inner_heap[INNER_HEAP_SIZE];
+
+    void __libnx_initheap(void);
+    void __appInit(void);
+    void __appExit(void);
+
+    /* Exception handling. */
+    alignas(16) u8 __nx_exception_stack[ams::os::MemoryPageSize];
+    u64 __nx_exception_stack_size = sizeof(__nx_exception_stack);
+    void __libnx_exception_handler(ThreadExceptionDump *ctx);
+}
+
+namespace ams {
+    ncm::ProgramId CurrentProgramId = ncm::SystemProgramId::JpegDec;
+
+    namespace result {
+
+        bool CallFatalOnResultAssertion = true;
+
+    }
+
+}
+
+using namespace ams;
+
+void __libnx_exception_handler(ThreadExceptionDump *ctx) {
+    ams::CrashHandler(ctx);
+}
+
+void __libnx_initheap(void) {
+    void*  addr = nx_inner_heap;
+    size_t size = nx_inner_heap_size;
+
+    /* Newlib */
+    extern char* fake_heap_start;
+    extern char* fake_heap_end;
+
+    fake_heap_start = (char*)addr;
+    fake_heap_end   = (char*)addr + size;
+}
+
+void __appInit(void) {
+    hos::InitializeForStratosphere();
+    ams::CheckApiVersion();
+}
+
+void __appExit(void) {
+    /* ... */
+}
+
+namespace {
+    constexpr size_t NumServers  = 1;
+    sf::hipc::ServerManager<NumServers> g_server_manager;
+
+    /* NOTE: Official code only allows for one session. */
+    constexpr sm::ServiceName DecodeServiceName    = sm::ServiceName::Encode("caps:dc");
+    constexpr size_t          DecodeMaxSessions    = 2;
+
+}
+
+int main(int argc, char **argv)
+{
+    /* Set thread name. */
+    os::SetThreadNamePointer(os::GetCurrentThread(), AMS_GET_SYSTEM_THREAD_NAME(jpegdec, Main));
+
+    /* Official jpegdec changes its thread priority to 21 in main. */
+    /* This is because older versions of the sysmodule had priority 20 in npdm. */
+    os::ChangeThreadPriority(os::GetCurrentThread(), AMS_GET_SYSTEM_THREAD_PRIORITY(jpegdec, Main));
+    AMS_ASSERT(os::GetThreadPriority(os::GetCurrentThread()) == AMS_GET_SYSTEM_THREAD_PRIORITY(jpegdec, Main));
+
+    /* Create service. */
+    R_ASSERT(g_server_manager.RegisterServer<jpegdec::DecodeService>(DecodeServiceName, DecodeMaxSessions));
+
+    /* Loop forever, servicing our services. */
+    g_server_manager.LoopProcess();
+
+    /* Cleanup */
+    return 0;
+}