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view VisualC/SDL_VS2008.sln @ 3333:b334b4f7dfa0
[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 | 1a8c9a6752e5 |
children | 42e33f89a167 |
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Microsoft Visual Studio Solution File, Format Version 10.00 # Visual Studio 2008 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SDL", "SDL\SDL_VS2008.vcproj", "{81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}" EndProject Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SDLmain", "SDLmain\SDLmain_VS2008.vcproj", "{DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}" EndProject Global GlobalSection(SolutionConfigurationPlatforms) = preSolution Debug|Win32 = Debug|Win32 Debug|x64 = Debug|x64 Release_NoSTDIO|Win32 = Release_NoSTDIO|Win32 Release_NoSTDIO|x64 = Release_NoSTDIO|x64 Release|Win32 = Release|Win32 Release|x64 = Release|x64 EndGlobalSection GlobalSection(ProjectConfigurationPlatforms) = postSolution {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Debug|Win32.ActiveCfg = Debug|Win32 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Debug|Win32.Build.0 = Debug|Win32 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Debug|x64.ActiveCfg = Debug|x64 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Debug|x64.Build.0 = Debug|x64 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Release_NoSTDIO|Win32.ActiveCfg = Release|Win32 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Release_NoSTDIO|Win32.Build.0 = Release|Win32 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Release_NoSTDIO|x64.ActiveCfg = Release|x64 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Release_NoSTDIO|x64.Build.0 = Release|x64 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Release|Win32.ActiveCfg = Release|Win32 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Release|Win32.Build.0 = Release|Win32 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Release|x64.ActiveCfg = Release|x64 {81CE8DAF-EBB2-4761-8E45-B71ABCCA8C68}.Release|x64.Build.0 = Release|x64 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Debug|Win32.ActiveCfg = Debug|Win32 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Debug|Win32.Build.0 = Debug|Win32 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Debug|x64.ActiveCfg = Debug|x64 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Debug|x64.Build.0 = Debug|x64 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Release_NoSTDIO|Win32.ActiveCfg = Release_NoSTDIO|Win32 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Release_NoSTDIO|Win32.Build.0 = Release_NoSTDIO|Win32 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Release_NoSTDIO|x64.ActiveCfg = Release_NoSTDIO|x64 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Release_NoSTDIO|x64.Build.0 = Release_NoSTDIO|x64 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Release|Win32.ActiveCfg = Release|Win32 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Release|Win32.Build.0 = Release|Win32 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Release|x64.ActiveCfg = Release|x64 {DA956FD3-E142-46F2-9DD5-C78BEBB56B7A}.Release|x64.Build.0 = Release|x64 EndGlobalSection GlobalSection(SolutionProperties) = preSolution HideSolutionNode = FALSE EndGlobalSection EndGlobal