Mercurial > sdl-ios-xcode
view build-scripts/snapshot.sh @ 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 | bb773ff79106 |
children | 64a2d8f538a1 |
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#!/bin/sh # # Generate a current snapshot from source control echo "Checking out source" svn co -q http://svn.libsdl.org/trunk/SDL (cd SDL && ./autogen.sh && rm -rf autom4te.cache) sh SDL/build-scripts/updaterev.sh cp SDL/include/SDL_config.h.default SDL/include/SDL_config.h major=`fgrep "#define SDL_MAJOR_VERSION" SDL/include/SDL_version.h | \ sed 's,[^0-9]*\([0-9]*\),\1,'` minor=`fgrep "#define SDL_MINOR_VERSION" SDL/include/SDL_version.h | \ sed 's,[^0-9]*\([0-9]*\),\1,'` patch=`fgrep "#define SDL_PATCHLEVEL" SDL/include/SDL_version.h | \ sed 's,[^0-9]*\([0-9]*\),\1,'` rev=`fgrep "#define SDL_REVISION" SDL/include/SDL_revision.h | \ sed 's,[^0-9]*\([0-9]*\),\1,'` path="SDL-$major.$minor.$patch-$rev" mv SDL $path echo $path.tar.gz tar zcf $path.tar.gz $path echo $path.zip rm -f $path.zip zip -rq $path.zip $path rm -rf $path #ln -sf $path.tar.gz SDL-1.3.tar.gz #ln -sf $path.zip SDL-1.3.zip #date=`date +"%a %b %e"` #sed -e "s/<-- SDL 1.3 DATE -->.*/<-- SDL 1.3 DATE --> $date/" <../svn.php >../svn.php.new #mv ../svn.php.new ../svn.php