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[SDL] Bad math in SDL_RenderCopy Mason Wheeler to sdl When I tried to render an image using something other than NULL for srcrect, it got horribly distorted. I traced it down to the fact that the math in the rectangle adjustments performed just before the call to renderer->RenderCopy is written inside out. It should look like this: if (dstrect->w != real_dstrect.w) { int deltax = (dstrect->x - real_dstrect.x); int deltaw = (dstrect->w - real_dstrect.w); real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w; real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w; } if (dstrect->h != real_dstrect.h) { int deltay = (dstrect->y - real_dstrect.y); int deltah = (dstrect->h - real_dstrect.h); real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h; real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
author Sam Lantinga <slouken@libsdl.org>
date Sat, 03 Oct 2009 16:23:16 +0000
parents d63e9f5944ae
children
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<?xml version="1.0" encoding="Windows-1252"?>
<VisualStudioProject
	ProjectType="Visual C++"
	Version="8.00"
	Name="testgamma"
	ProjectGUID="{D974A0DF-3E2E-445C-A2EB-E899E9B582CB}"
	>
	<Platforms>
		<Platform
			Name="Win32"
		/>
	</Platforms>
	<ToolFiles>
	</ToolFiles>
	<Configurations>
		<Configuration
			Name="Debug|Win32"
			OutputDirectory=".\Debug"
			IntermediateDirectory=".\Debug"
			ConfigurationType="1"
			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC70.vsprops"
			UseOfMFC="0"
			ATLMinimizesCRunTimeLibraryUsage="false"
			>
			<Tool
				Name="VCPreBuildEventTool"
			/>
			<Tool
				Name="VCCustomBuildTool"
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				Name="VCXMLDataGeneratorTool"
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			<Tool
				Name="VCWebServiceProxyGeneratorTool"
			/>
			<Tool
				Name="VCMIDLTool"
				PreprocessorDefinitions="_DEBUG"
				MkTypLibCompatible="true"
				SuppressStartupBanner="true"
				TargetEnvironment="1"
				TypeLibraryName=".\Debug/testgamma.tlb"
			/>
			<Tool
				Name="VCCLCompilerTool"
				Optimization="0"
				AdditionalIncludeDirectories="..\..\..\include"
				PreprocessorDefinitions="WIN32,_DEBUG,_WINDOWS"
				RuntimeLibrary="2"
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				PrecompiledHeaderFile=".\Debug/testgamma.pch"
				AssemblerListingLocation=".\Debug/"
				ObjectFile=".\Debug/"
				ProgramDataBaseFileName=".\Debug/"
				WarningLevel="3"
				SuppressStartupBanner="true"
				DebugInformationFormat="4"
				CompileAs="0"
			/>
			<Tool
				Name="VCManagedResourceCompilerTool"
			/>
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				Name="VCResourceCompilerTool"
				PreprocessorDefinitions="_DEBUG"
				Culture="1033"
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			<Tool
				Name="VCPreLinkEventTool"
			/>
			<Tool
				Name="VCLinkerTool"
				AdditionalOptions="/MACHINE:I386"
				OutputFile=".\Debug/testgamma.exe"
				LinkIncremental="2"
				SuppressStartupBanner="true"
				GenerateDebugInformation="true"
				ProgramDatabaseFile=".\Debug/testgamma.pdb"
				SubSystem="2"
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			<Tool
				Name="VCWebDeploymentTool"
			/>
			<Tool
				Name="VCPostBuildEventTool"
			/>
		</Configuration>
		<Configuration
			Name="Release|Win32"
			OutputDirectory=".\Release"
			IntermediateDirectory=".\Release"
			ConfigurationType="1"
			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC70.vsprops"
			UseOfMFC="0"
			ATLMinimizesCRunTimeLibraryUsage="false"
			>
			<Tool
				Name="VCPreBuildEventTool"
			/>
			<Tool
				Name="VCCustomBuildTool"
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				Name="VCXMLDataGeneratorTool"
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			<Tool
				Name="VCWebServiceProxyGeneratorTool"
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				Name="VCMIDLTool"
				PreprocessorDefinitions="NDEBUG"
				MkTypLibCompatible="true"
				SuppressStartupBanner="true"
				TargetEnvironment="1"
				TypeLibraryName=".\Release/testgamma.tlb"
			/>
			<Tool
				Name="VCCLCompilerTool"
				InlineFunctionExpansion="1"
				AdditionalIncludeDirectories="..\..\..\include"
				PreprocessorDefinitions="WIN32,NDEBUG,_WINDOWS"
				StringPooling="true"
				RuntimeLibrary="2"
				EnableFunctionLevelLinking="true"
				UsePrecompiledHeader="0"
				PrecompiledHeaderFile=".\Release/testgamma.pch"
				AssemblerListingLocation=".\Release/"
				ObjectFile=".\Release/"
				ProgramDataBaseFileName=".\Release/"
				WarningLevel="3"
				SuppressStartupBanner="true"
				CompileAs="0"
			/>
			<Tool
				Name="VCManagedResourceCompilerTool"
			/>
			<Tool
				Name="VCResourceCompilerTool"
				PreprocessorDefinitions="NDEBUG"
				Culture="1033"
			/>
			<Tool
				Name="VCPreLinkEventTool"
			/>
			<Tool
				Name="VCLinkerTool"
				AdditionalOptions="/MACHINE:I386"
				OutputFile=".\Release/testgamma.exe"
				LinkIncremental="1"
				SuppressStartupBanner="true"
				ProgramDatabaseFile=".\Release/testgamma.pdb"
				SubSystem="2"
			/>
			<Tool
				Name="VCALinkTool"
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			<Tool
				Name="VCManifestTool"
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			<Tool
				Name="VCXDCMakeTool"
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			<Tool
				Name="VCBscMakeTool"
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			<Tool
				Name="VCFxCopTool"
			/>
			<Tool
				Name="VCAppVerifierTool"
			/>
			<Tool
				Name="VCWebDeploymentTool"
			/>
			<Tool
				Name="VCPostBuildEventTool"
			/>
		</Configuration>
	</Configurations>
	<References>
	</References>
	<Files>
		<File
			RelativePath="..\..\Sdl\Debug\SDL.lib"
			>
		</File>
		<File
			RelativePath="..\..\SDLmain\Debug\SDLmain.lib"
			>
		</File>
		<File
			RelativePath="..\..\..\test\testgamma.c"
			>
		</File>
	</Files>
	<Globals>
	</Globals>
</VisualStudioProject>