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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 22ac66da0765
children c32c53fca10d
line wrap: on
line source



CFLAGS  := -W -Wall -Wextra -g -I. `sdl-config --cflags`
LDFLAGS := `sdl-config --libs`

# If it doesn't pick up defaults
#CFLAGS  := -I. -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/local/include/SDL
#LDFLAGS := -lm -ldl -lesd -lpthread

SRC         	:= testsdl.c \
						rwops/rwops.c \
						platform/platform.c \
						surface/surface.c \
						render/render.c \
						audio/audio.c
COMMON_SRC     := SDL_at.c common/common.c
COMMON_INCLUDE := SDL_at.h

TESTS_ALL := testsdl \
	rwops/rwops \
	platform/platform \
	surface/surface \
	render/render \
	audio/audio


.PHONY: all clean test


all: $(TESTS_ALL)

test: all
	@./testsdl

testsdl: $(SRC) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(SRC) $(COMMON_SRC)

rwops/rwops: rwops/rwops.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ rwops/rwops.c $(COMMON_SRC) -DTEST_STANDALONE

platform/platform: platform/platform.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ platform/platform.c $(COMMON_SRC) -DTEST_STANDALONE

surface/surface: surface/surface.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ surface/surface.c $(COMMON_SRC) -DTEST_STANDALONE

render/render: render/render.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ render/render.c $(COMMON_SRC) -DTEST_STANDALONE

audio/audio: audio/audio.c $(COMMON_INCLUDE) $(COMMON_SRC)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ audio/audio.c $(COMMON_SRC) -DTEST_STANDALONE

clean:
	$(RM) $(TESTS_ALL)