Mercurial > sdl-ios-xcode
view Makefile.pandora @ 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 | 81773a1eac83 |
children | 11cedc036ca1 |
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# Makefile to build the pandora SDL library AR = arm-none-linux-gnueabi-ar RANLIB = arm-none-linux-gnueabi-ranlib CC = arm-none-linux-gnueabi-gcc CXX = arm-none-linux-gnueabi-g++ STRIP = arm-none-linux-gnueabi-strip CFLAGS = -O3 -march=armv7-a -mcpu=cortex-a8 -mtune=cortex-a8 -mfloat-abi=softfp \ -mfpu=neon -ftree-vectorize -ffast-math -fomit-frame-pointer -fno-strict-aliasing -fsingle-precision-constant \ -I./include -I$(PNDSDK)/usr/include -DSDL_REVISION=0 TARGET = libSDL.a SOURCES = ./src/*.c ./src/audio/*.c ./src/cdrom/*.c ./src/cpuinfo/*.c ./src/events/*.c \ ./src/file/*.c ./src/stdlib/*.c ./src/thread/*.c ./src/timer/*.c ./src/video/*.c \ ./src/joystick/*.c ./src/haptic/*.c ./src/power/*.c ./src/video/dummy/*.c ./src/audio/disk/*.c \ ./src/audio/dummy/*.c ./src/loadso/dlopen/*.c ./src/audio/dsp/*.c ./src/audio/dma/*.c \ ./src/thread/pthread/SDL_systhread.c ./src/thread/pthread/SDL_syssem.c \ ./src/thread/pthread/SDL_sysmutex.c ./src/thread/pthread/SDL_syscond.c \ ./src/joystick/linux/*.c ./src/haptic/linux/*.c ./src/timer/unix/*.c ./src/cdrom/dummy/*.c \ ./src/video/pandora/SDL_pandora.o ./src/video/pandora/SDL_pandora_events.o ./src/video/x11/*.c OBJECTS = $(shell echo $(SOURCES) | sed -e 's,\.c,\.o,g') CONFIG_H = $(shell cp include/SDL_config_pandora.h include/SDL_config.h && touch include/SDL_revision.h) all: $(TARGET) $(TARGET): $(CONFIG_H) $(OBJECTS) $(AR) crv $@ $^ $(RANLIB) $@ clean: rm -f $(TARGET) $(OBJECTS)