Rewrite cellPngDec to use libpng

Improvements made: * Supports tEXt chunks * Supports chunk information * Supports 16-bit depth image packing (fixes #1127) * Supports fixed alpha values * And more.
2024-11-22 02:32:36 +01:00 · 2016-01-19 21:24:41 +02:00 · 2016-01-19 21:24:41 +02:00 · 0c8c13b8b7
commit 0c8c13b8b7
parent 303a109286
12 changed files with 866 additions and 440 deletions
--- a/.gitmodules
+++ b/.gitmodules
@ -22,3 +22,6 @@
 [submodule "GSL"]
 	path = GSL
 	url = https://github.com/Microsoft/GSL.git
+[submodule "libpng"]
+	path = libpng
+	url = https://github.com/RPCS3/libpng
--- a/.travis.yml
+++ b/.travis.yml
@ -53,7 +53,7 @@ before_install:
    fi;

 before_script:
- - git submodule update --init asmjit ffmpeg rsx_program_decompiler GSL
+ - git submodule update --init asmjit ffmpeg rsx_program_decompiler GSL libpng
 - mkdir build
 - cd build
 - if [ "$TRAVIS_OS_NAME" = "linux" ]; then cmake ..; else cmake .. -DLLVM_DIR=/usr/local/opt/llvm36/lib/llvm-3.6/share/llvm/cmake; fi
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -12,6 +12,7 @@ if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
 endif()

 add_subdirectory( asmjit )
+add_subdirectory( libpng )
 # TODO: do real installation, including copying directory structure
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE "${PROJECT_BINARY_DIR}/bin")
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG "${PROJECT_BINARY_DIR}/bin")
--- a/appveyor.yml
+++ b/appveyor.yml
@ -14,7 +14,7 @@ branches:

 before_build:
 # until git for win 2.5 release with commit checkout
- - git submodule update --init ffmpeg asmjit minidx9 rsx_program_decompiler GSL
+ - git submodule update --init ffmpeg asmjit minidx9 rsx_program_decompiler GSL libpng
 - 7z x wxWidgets.7z -aos -oC:\rpcs3\wxWidgets > null
 - if %configuration%==Release (cmake -G "Visual Studio 14 Win64")
   else (7z x llvmlibs.7z -aos -oC:\rpcs3 > null && cmake -G "Visual Studio 14 Win64" -DLLVM_DIR=C:/rpcs3/llvm_build/share/llvm/cmake)
--- a/1
+++ b/1
@ -0,0 +1 @@
+Subproject commit ea77a6fd4983e6c2ab4ef1dee7c819188c2f4f3e
--- a/rpcs3.sln
+++ b/rpcs3.sln
@ -17,6 +17,7 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "rpcs3", "rpcs3\rpcs3.vcxpro
 		{97FDAB45-9C58-5BC5-A2F4-EE42739EBC63} = {97FDAB45-9C58-5BC5-A2F4-EE42739EBC63}
 		{A1A8355B-0988-528E-9CC2-B971D6266669} = {A1A8355B-0988-528E-9CC2-B971D6266669}
 		{09F2F96A-1CC6-5E43-AF1D-956EC2A4888D} = {09F2F96A-1CC6-5E43-AF1D-956EC2A4888D}
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {D6973076-9317-4EF2-A0B8-B7A18AC0713E}
 		{8B867186-A0B5-5479-B824-E176EDD27C40} = {8B867186-A0B5-5479-B824-E176EDD27C40}
 		{87B42A9C-3F5C-53D7-9017-2B1CAE39457D} = {87B42A9C-3F5C-53D7-9017-2B1CAE39457D}
 		{8BC303AB-25BE-4276-8E57-73F171B2D672} = {8BC303AB-25BE-4276-8E57-73F171B2D672}
@ -197,6 +198,17 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "XAudio", "rpcs3\XAudio.vcxp
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "OpenAL", "rpcs3\OpenAL.vcxproj", "{30A05C4D-F5FD-421C-A864-17A64BDEAA75}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "libpng", "libpng", "{A17D34F1-7E3E-4841-818D-3B7C6F5AF829}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libpng", "libpng\projects\vstudio\libpng\libpng.vcxproj", "{D6973076-9317-4EF2-A0B8-B7A18AC0713E}"
+	ProjectSection(ProjectDependencies) = postProject
+		{60F89955-91C6-3A36-8000-13C592FEC2DF} = {60F89955-91C6-3A36-8000-13C592FEC2DF}
+	EndProjectSection
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "zlib", "zlib", "{F0C19EFA-EDD0-43F2-97C1-18E865E96B4E}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlib", "libpng\projects\vstudio\zlib\zlib.vcxproj", "{60F89955-91C6-3A36-8000-13C592FEC2DF}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug - LLVM|x64 = Debug - LLVM|x64
@ -693,6 +705,34 @@ Global
 		{30A05C4D-F5FD-421C-A864-17A64BDEAA75}.Release - LLVM|x64.Build.0 = Release - LLVM|x64
 		{30A05C4D-F5FD-421C-A864-17A64BDEAA75}.Release|x64.ActiveCfg = Release|x64
 		{30A05C4D-F5FD-421C-A864-17A64BDEAA75}.Release|x64.Build.0 = Release|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Debug - LLVM|x64.ActiveCfg = Debug Library|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Debug - LLVM|x64.Build.0 = Debug Library|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Debug - MemLeak|x64.ActiveCfg = Debug Library|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Debug - MemLeak|x64.Build.0 = Debug Library|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Debug|x64.ActiveCfg = Debug|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Debug|x64.Build.0 = Debug|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.DLL Debug|x64.ActiveCfg = Debug|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.DLL Debug|x64.Build.0 = Debug|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.DLL Release|x64.ActiveCfg = Release|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.DLL Release|x64.Build.0 = Release|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Release - LLVM|x64.ActiveCfg = Release Library|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Release - LLVM|x64.Build.0 = Release Library|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Release|x64.ActiveCfg = Release|x64
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E}.Release|x64.Build.0 = Release|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug - LLVM|x64.ActiveCfg = Debug Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug - LLVM|x64.Build.0 = Debug Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug - MemLeak|x64.ActiveCfg = Debug Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug - MemLeak|x64.Build.0 = Debug Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug|x64.ActiveCfg = Debug Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Debug|x64.Build.0 = Debug Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.DLL Debug|x64.ActiveCfg = Debug Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.DLL Debug|x64.Build.0 = Debug Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.DLL Release|x64.ActiveCfg = Release Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.DLL Release|x64.Build.0 = Release Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Release - LLVM|x64.ActiveCfg = Release Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Release - LLVM|x64.Build.0 = Release Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Release|x64.ActiveCfg = Release Library|x64
+		{60F89955-91C6-3A36-8000-13C592FEC2DF}.Release|x64.Build.0 = Release Library|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@ -730,5 +770,7 @@ Global
 		{7D73447B-3D2D-4DFE-BF62-57E644C1D09F} = {10FBF193-D532-4CCF-B875-4C7091A7F6C2}
 		{78CB2F39-B809-4A06-8329-8C0A19119D3D} = {10FBF193-D532-4CCF-B875-4C7091A7F6C2}
 		{30A05C4D-F5FD-421C-A864-17A64BDEAA75} = {10FBF193-D532-4CCF-B875-4C7091A7F6C2}
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {A17D34F1-7E3E-4841-818D-3B7C6F5AF829}
+		{60F89955-91C6-3A36-8000-13C592FEC2DF} = {F0C19EFA-EDD0-43F2-97C1-18E865E96B4E}
 	EndGlobalSection
 EndGlobal
--- a/rpcs3/CMakeLists.txt
+++ b/rpcs3/CMakeLists.txt
@ -88,6 +88,7 @@ if(NOT MSVC)
 endif()
 find_package(OpenGL REQUIRED)
 find_package(OpenAL REQUIRED)
+find_package(PNG REQUIRED)
 find_package(LLVM CONFIG)

 include("${wxWidgets_USE_FILE}")
@ -104,6 +105,7 @@ include_directories(
 ${GLEW_INCLUDE_DIR}
 ${wxWidgets_INCLUDE_DIRS}
 ${OPENAL_INCLUDE_DIR}
+${PNG_INCLUDE_DIRS}
 ${LLVM_INCLUDE_DIRS}
 "${RPCS3_SRC_DIR}/../ffmpeg/${PLATFORM_ARCH}/include"
 "${RPCS3_SRC_DIR}"
@ -181,17 +183,17 @@ if(WIN32) # I'm not sure we need all of these libs, but we link them in vs
 		target_link_libraries(rpcs3  ${LLVM_LIBS})
 	endif()
 	if(NOT MSVC)
-		target_link_libraries(rpcs3  ${OPENGL_LIBRARIES} ${GLEW_LIBRARY} opengl32.lib glu32.lib)
+		target_link_libraries(rpcs3  ${OPENGL_LIBRARIES} ${PNG_LIBRARIES} ${GLEW_LIBRARY} opengl32.lib glu32.lib)
 	else()
 		target_link_libraries(rpcs3  dxgi.lib d2d1.lib dwrite.lib)
 	endif()
 	target_link_libraries(rpcs3  asmjit.lib avformat.lib avcodec.lib avutil.lib swresample.lib swscale.lib ${wxWidgets_LIBRARIES} ${OPENAL_LIBRARY} ${ADDITIONAL_LIBS})
 else()
 	if(LLVM_FOUND)
-		target_link_libraries(rpcs3  asmjit.a  ${wxWidgets_LIBRARIES} ${OPENAL_LIBRARY} ${GLEW_LIBRARY} ${OPENGL_LIBRARIES})
+		target_link_libraries(rpcs3  asmjit.a  ${wxWidgets_LIBRARIES} ${OPENAL_LIBRARY} ${GLEW_LIBRARY} ${OPENGL_LIBRARIES} ${PNG_LIBRARIES})
 		target_link_libraries(rpcs3  libavformat.a libavcodec.a libavutil.a libswresample.a libswscale.a ${ZLIB_LIBRARIES} ${LLVM_LIBS} ${ADDITIONAL_LIBS})
 	else()
-		target_link_libraries(rpcs3  asmjit.a  ${wxWidgets_LIBRARIES} ${OPENAL_LIBRARY} ${GLEW_LIBRARY} ${OPENGL_LIBRARIES})
+		target_link_libraries(rpcs3  asmjit.a  ${wxWidgets_LIBRARIES} ${OPENAL_LIBRARY} ${GLEW_LIBRARY} ${OPENGL_LIBRARIES} ${PNG_LIBRARIES})
 		target_link_libraries(rpcs3  libavformat.a libavcodec.a libavutil.a libswresample.a libswscale.a ${ZLIB_LIBRARIES} ${ADDITIONAL_LIBS})
    endif()
 endif()
--- a/rpcs3/Emu/SysCalls/Modules/cellPng.h
+++ b/rpcs3/Emu/SysCalls/Modules/cellPng.h
@ -9,6 +9,13 @@ enum CellPngTxtType : s32
 	CELL_PNG_ITXT = 2,
 };

+enum CellPngUnknownLocation : s32
+{
+	CELL_PNG_BEFORE_PLTE = 1,
+	CELL_PNG_BEFORE_IDAT = 2,
+	CELL_PNG_AFTER_IDAT  = 8,
+};
+
 struct CellPngPLTEentry
 {
 	u8 red;
@ -33,13 +40,6 @@ struct CellPngSPLTentry
 	be_t<u32> paletteEntriesNumber;
 };

-enum CellPngUnknownLocation : s32
-{
-	CELL_PNG_BEFORE_PLTE = 1,
-	CELL_PNG_BEFORE_IDAT = 2,
-	CELL_PNG_AFTER_IDAT  = 8,
-};
-
 struct CellPngTextInfo
 {
 	be_t<s32> txtType; // CellPngTxtType
--- a/rpcs3/Emu/SysCalls/Modules/cellPngDec.cpp
+++ b/rpcs3/Emu/SysCalls/Modules/cellPngDec.cpp
--- a/rpcs3/Emu/SysCalls/Modules/cellPngDec.h
+++ b/rpcs3/Emu/SysCalls/Modules/cellPngDec.h
@ -83,9 +83,20 @@ enum CellPngDecDecodeStatus : s32
 	CELL_PNGDEC_DEC_STATUS_STOP   = 1,
 };

+enum CellPngDecBufferMode : s32
+{
+	CELL_PNGDEC_LINE_MODE = 1,
+};
+
+enum CellPngDecSpuMode : s32
+{
+	CELL_PNGDEC_RECEIVE_EVENT    = 0,
+	CELL_PNGDEC_TRYRECEIVE_EVENT = 1,
+};
+
 // Callbacks for memory management
 using CellPngDecCbControlMalloc = vm::ptr<void>(u32 size, vm::ptr<void> cbCtrlMallocArg);
-using CellPngDecCbControlFree = s32(vm::ptr<void> ptr, vm::ptr<void> cbCtrlFreeArg);
+using CellPngDecCbControlFree   = s32(vm::ptr<void> ptr, vm::ptr<void> cbCtrlFreeArg);

 // Structs
 struct CellPngDecThreadInParam
@ -179,18 +190,6 @@ struct CellPngDecDataOutInfo
 	be_t<s32> status; // CellPngDecDecodeStatus
 };

-// Defines for decoding partial streams
-enum CellPngDecBufferMode : s32
-{
-	CELL_PNGDEC_LINE_MODE = 1,
-};
-
-enum CellPngDecSpuMode : s32
-{
-	CELL_PNGDEC_RECEIVE_EVENT    = 0,
-	CELL_PNGDEC_TRYRECEIVE_EVENT = 1,
-};
-
 // Structs for decoding partial streams
 struct CellPngDecStrmInfo
 {
@ -248,7 +247,7 @@ struct CellPngDecExtOutParam

 // Callbacks for decoding partial streams
 using CellPngDecCbControlStream = s32(vm::ptr<CellPngDecStrmInfo> strmInfo, vm::ptr<CellPngDecStrmParam> strmParam, vm::ptr<void> cbCtrlStrmArg);
-using CellPngDecCbControlDisp = s32(vm::ptr<CellPngDecDispInfo> dispInfo, vm::ptr<CellPngDecDispParam> dispParam, vm::ptr<void> cbCtrlDispArg);
+using CellPngDecCbControlDisp   = s32(vm::ptr<CellPngDecDispInfo> dispInfo, vm::ptr<CellPngDecDispParam> dispParam, vm::ptr<void> cbCtrlDispArg);

 struct CellPngDecCbCtrlStrm
 {
@ -263,7 +262,7 @@ struct CellPngDecCbCtrlDisp
 };

 // Custom structs
-struct PngDecoder
+struct PngHandle
 {
 	vm::ptr<CellPngDecCbControlMalloc> malloc;
 	vm::ptr<void> malloc_arg;
@ -271,17 +270,53 @@ struct PngDecoder
 	vm::ptr<void> free_arg;
 };

+// For reading from a buffer using libpng
+struct PngBuffer
+{
+	// The cursor location and data pointer for reading from a buffer
+	size_t cursor;
+	size_t length;
+	vm::bptr<void> data;
+
+	// The file descriptor, and whether we need to read from a file descriptor
+	bool file;
+	u32 fd;
+};
+
 struct PngStream
 {
-	vm::ptr<PngDecoder> dec;
-
-	// old data:
-	u32 fd;
-	u64 fileSize;
+	// PNG decoding structures
 	CellPngDecInfo info;
-	CellPngDecOutParam outParam;
-	CellPngDecSrc src;
-
+	CellPngDecOutParam out_param;
+	CellPngDecSrc source;
 	CellPngDecStrmInfo streamInfo;
 	CellPngDecStrmParam streamParam;
+
+	// Fixed alpha value and flag
+	bool fixed_alpha;
+	be_t<u32> fixed_alpha_colour;
+
+	// Pixel packing value
+	be_t<s32> packing;
+	
+	// PNG custom read function structure, for decoding from a buffer
+	vm::ptr<PngBuffer> buffer;
+
+	// libpng structures for reading and decoding the PNG file
+	png_structp png_ptr;
+	png_infop info_ptr;
 };
+
+// Converts libpng colour type to cellPngDec colour type
+static s32 getPngDecColourType(u8 type)
+{
+	switch (type)
+	{
+	case PNG_COLOR_TYPE_RGB:        return CELL_PNGDEC_RGB;
+	case PNG_COLOR_TYPE_RGBA:       return CELL_PNGDEC_RGBA; // We can't diffrentiate between ARGB and RGBA. Doesn't seem to be exactly important.
+	case PNG_COLOR_TYPE_PALETTE:    return CELL_PNGDEC_PALETTE;
+	case PNG_COLOR_TYPE_GRAY:       return CELL_PNGDEC_GRAYSCALE;
+	case PNG_COLOR_TYPE_GRAY_ALPHA: return CELL_PNGDEC_GRAYSCALE_ALPHA;
+	default: throw EXCEPTION("Unknown colour type: %d", type);
+	}
+}
--- a/rpcs3_default.props
+++ b/rpcs3_default.props
@ -3,7 +3,7 @@
  <ImportGroup Label="PropertySheets" />
  <PropertyGroup Label="UserMacros" />
  <PropertyGroup>
-    <IncludePath>.\;..\;..\asmjit\src\asmjit;..\wxWidgets\include\msvc;..\wxWidgets\include;..\ffmpeg\WindowsInclude;..\ffmpeg\Windows\x86_64\Include;$(VC_IncludePath);$(WindowsSDK_IncludePath);..\llvm\include;..\llvm_build\include;$(UniversalCRT_IncludePath);..\minidx12\Include;..\glm;..\GSL\include</IncludePath>
+    <IncludePath>.\;..\;..\asmjit\src\asmjit;..\wxWidgets\include\msvc;..\wxWidgets\include;..\ffmpeg\WindowsInclude;..\ffmpeg\Windows\x86_64\Include;$(VC_IncludePath);$(WindowsSDK_IncludePath);..\llvm\include;..\llvm_build\include;$(UniversalCRT_IncludePath);..\minidx12\Include;..\glm;..\GSL\include;..\libpng</IncludePath>
    <OutDir>$(SolutionDir)lib\$(Configuration)-$(Platform)\</OutDir>
    <LibraryPath>$(SolutionDir)lib\$(Configuration)-$(Platform)\;$(UniversalCRT_LibraryPath_x64);$(LibraryPath)</LibraryPath>
    <IntDir>$(SolutionDir)tmp\$(ProjectName)-$(Configuration)-$(Platform)\</IntDir>
@ -25,9 +25,9 @@
    <Link>
      <SubSystem>Windows</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>odbc32.lib;odbccp32.lib;comctl32.lib;ws2_32.lib;shlwapi.lib;winmm.lib;kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;rpcrt4.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>odbc32.lib;odbccp32.lib;comctl32.lib;ws2_32.lib;shlwapi.lib;winmm.lib;kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;rpcrt4.lib;libpng.lib;%(AdditionalDependencies)</AdditionalDependencies>
      <DataExecutionPrevention>true</DataExecutionPrevention>
-      <AdditionalLibraryDirectories>..\wxWidgets\lib\vc_x64_lib;..\ffmpeg\Windows\x86_64\lib</AdditionalLibraryDirectories>
+      <AdditionalLibraryDirectories>..\wxWidgets\lib\vc_x64_lib;..\ffmpeg\Windows\x86_64\lib;..\lib\</AdditionalLibraryDirectories>
      <BaseAddress>0x10000</BaseAddress>
      <RandomizedBaseAddress>false</RandomizedBaseAddress>
    </Link>
--- a/zlib.props
+++ b/zlib.props
@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ * zlib.props - location of zlib source
+ *
+ * libpng version 1.6.20 - December 3, 2015
+ *
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+
+ * You must edit this file to record the location of the zlib
+ * source code.
+ -->
+
+<Project ToolsVersion="4.0"
+   xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Label="Globals">
+    <!-- Place the name of the directory containing the source of zlib used for
+	 debugging in this property.
+
+         The directory need only contain the '.c' and '.h' files from the
+	 source.
+
+	 If you use a relative directory name (as below) then it must be
+	 relative to the project directories; these are one level deeper than
+	 the directories containing this file.
+
+	 If the version of zlib you use does not match that used when the
+	 distribution was built you will get warnings from pngtest that the zlib
+	 versions do not match.  The zlib version used in this build is recorded
+	 below:
+     -->
+    <ZLibSrcDir>..\..\..\..\wxWidgets\src\zlib\</ZLibSrcDir>
+
+    <!-- The following line allows compilation for an ARM target with Visual
+         Studio 2012.  Notice that this is not supported by the Visual Studio
+         2012 IDE and that the programs that result cannot be run unless they
+         signed by Microsoft.  This is therefore untested; only Microsoft can
+         test it:
+     -->
+    <WindowsSDKDesktopARMSupport>true</WindowsSDKDesktopARMSupport>
+  </PropertyGroup>
+</Project>
				`@ -0,0 +1 @@`
				`Subproject commit ea77a6fd4983e6c2ab4ef1dee7c819188c2f4f3e`