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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 b7a48f533966
children c5925cd41955
line wrap: on
line source


#LibSDL 1.3 porting and enhancements by Darren Alton (lifning)
#LibSDL 1.2.9 DS porting by Troy Davis(GPF)

ifeq ($(strip $(DEVKITPRO)),)
$(error "Please set DEVKITPRO in your environment (available from http://www.devkitpro.org). export DEVKITPRO=<path to>devkitPro")
endif
ifeq ($(strip $(DEVKITARM)),)
DEVKITARM = $(DEVKITPRO)/devkitARM
endif
PATH := $(PATH):$(DEVKITARM)/bin

CC = arm-eabi-gcc
AR = arm-eabi-ar
RANLIB = arm-eabi-ranlib

#ifdef GL
#DEFS += -DSDL_VIDEO_OPENGL=1
#TARGET = libSDL_gl.a
#else
TARGET = libSDL.a
#endif

#CFLAGS=$(DEFS) -Iinclude
CFLAGS	=	-mthumb -mthumb-interwork \
		-march=armv5te -mtune=arm946e-s \
		-O2 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
		-DARM9 -D__NDS__ -I$(DEVKITPRO)/libnds/include -DENABLE_NDS -DNO_SIGNAL_H -DDISABLE_THREADS -DPACKAGE=\"SDL\" -DVERSION=\"1.3\" -DHAVE_ALLOCA_H=1 -DHAVE_ALLOCA=1 \
		-Iinclude -Isrc -Isrc/audio -Isrc/cdrom -Isrc/endian -Isrc/events -Isrc/joystick -Isrc/thread/nds -Isrc/thread -Isrc/timer -Isrc/video

#src/audio/disk/SDL_diskaudio.c \
#src/audio/dummy/SDL_dummyaudio.c \

SRCS = \
src/SDL.c \
src/SDL_compat.c \
src/SDL_error.c \
src/SDL_fatal.c \
src/audio/nds/SDL_ndsaudio.c \
src/audio/SDL_audio.c \
src/audio/SDL_audiocvt.c \
src/audio/SDL_audiodev.c \
src/audio/SDL_audiotypecvt.c \
src/audio/SDL_mixer.c \
src/audio/SDL_mixer_m68k.c \
src/audio/SDL_mixer_MMX.c \
src/audio/SDL_mixer_MMX_VC.c \
src/audio/SDL_wave.c \
src/cdrom/dummy/SDL_syscdrom.c \
src/cdrom/SDL_cdrom.c \
src/cpuinfo/SDL_cpuinfo.c \
src/events/SDL_events.c \
src/events/SDL_keyboard.c \
src/events/SDL_mouse.c \
src/events/SDL_quit.c \
src/events/SDL_windowevents.c \
src/file/SDL_rwops.c \
src/power/SDL_power.c \
src/power/nds/SDL_syspower.c \
src/haptic/SDL_haptic.c \
src/haptic/nds/SDL_syshaptic.c \
src/joystick/nds/SDL_sysjoystick.c \
src/joystick/SDL_joystick.c \
src/stdlib/SDL_getenv.c \
src/stdlib/SDL_iconv.c \
src/stdlib/SDL_malloc.c \
src/stdlib/SDL_qsort.c \
src/stdlib/SDL_stdlib.c \
src/stdlib/SDL_string.c \
src/thread/SDL_thread.c \
src/thread/nds/SDL_syscond.c \
src/thread/nds/SDL_sysmutex.c \
src/thread/nds/SDL_syssem.c \
src/thread/nds/SDL_systhread.c \
src/timer/nds/SDL_systimer.c \
src/timer/SDL_timer.c \
src/video/nds/SDL_ndsevents.c \
src/video/nds/SDL_ndsrender.c \
src/video/nds/SDL_ndsvideo.c \
src/video/dummy/SDL_nullevents.c \
src/video/dummy/SDL_nullrender.c \
src/video/dummy/SDL_nullvideo.c \
src/video/SDL_blit_0.c \
src/video/SDL_blit_1.c \
src/video/SDL_blit_A.c \
src/video/SDL_blit_auto.c \
src/video/SDL_blit.c \
src/video/SDL_blit_copy.c \
src/video/SDL_blit_N.c \
src/video/SDL_blit_slow.c \
src/video/SDL_bmp.c \
src/video/SDL_drawline.c \
src/video/SDL_drawpoint.c \
src/video/SDL_fillrect.c \
src/video/SDL_gamma.c \
src/video/SDL_pixels.c \
src/video/SDL_rect.c \
src/video/SDL_renderer_gl.c \
src/video/SDL_renderer_sw.c \
src/video/SDL_RLEaccel.c \
src/video/SDL_stretch.c \
src/video/SDL_surface.c \
src/video/SDL_video.c \
src/video/SDL_yuv_mmx.c \
src/video/SDL_yuv_sw.c \

OBJS = $(SRCS:.c=.o)

TEST = \
test/nds-test-progs/general/general.nds \
test/nds-test-progs/sprite/sprite.nds \
test/nds-test-progs/sprite2/sprite2.nds \


all: $(TARGET)

$(TARGET): copy_config \
	$(OBJS)
	$(AR) rc $(TARGET) $(OBJS)
	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1

install: $(TARGET)
	@cp libSDL.a $(DEVKITPRO)/libnds/lib/
	@mkdir -p $(DEVKITPRO)/libnds/include/SDL/
	@cp include/*.h $(DEVKITPRO)/libnds/include/SDL/

nds_test:
	$(MAKE) -C test/nds-test-progs

copy_config:
	@cp include/SDL_config.h.default include/SDL_config.h

clean:
	rm -f include/SDL_config.h $(OBJS)