*.COF
*.dja
*.DJA
+tools/rlesprite/rlesprite
csrc = $(wildcard src/*.c) $(wildcard src/sdl/*.c) $(wildcard src/3dgfx/*.c)
+asmsrc = $(wildcard src/*.asm)
-obj = $(csrc:.c=.o)
+obj = $(csrc:.c=.o) $(asmsrc:.asm=.o)
dep = $(obj:.o=.d)
bin = game
inc = -Isrc -Isrc/sdl -Isrc/3dgfx -Ilibs/imago/src
+warn = -pedantic -Wall
-CFLAGS = $(arch) -pedantic -Wall -g -MMD $(inc) `sdl-config --cflags`
+CFLAGS = $(arch) $(warn) -g -MMD $(inc) `sdl-config --cflags`
LDFLAGS = $(arch) -Llibs/imago -limago $(sdl_ldflags) -lm
ifneq ($(shell uname -m), i386)
sdl_ldflags = `sdl-config --libs`
endif
+.PHONY: all
+all: data $(bin)
$(bin): $(obj) imago
$(CC) -o $@ $(obj) $(LDFLAGS)
+%.o: %.asm
+ nasm -f elf -o $@ $<
+
-include $(dep)
.PHONY: imago
.PHONY: cleandep
cleandep:
rm -f $(dep)
+
+.PHONY: data
+data:
+ @tools/procdata
fade = 256 - (tm - 2 * FADE_DUR) * 256 / FADE_DUR;
} else {
fade = 0;
- menu_start();
+ //menu_start();
}
for(i=0; i<fb_height; i++) {
}
}
- cs_dputs(fb_pixels, 10, 10, "foo");
+ //cs_dputs(fb_pixels, 10, 10, "foo");
blit_frame(fb_pixels, 1);
}
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include "inttypes.h"
+#include "sprite.h"
+#include "util.h"
+
+#pragma pack (push, 1)
+struct file_header {
+ char magic[8];
+ uint16_t width, height, bpp;
+ uint16_t count;
+} PACKED;
+#pragma pack (pop)
+
+
+static int read_sprite(struct sprite *spr, int pixsz, FILE *fp);
+
+
+void destroy_sprites(struct sprites *ss)
+{
+ int i;
+
+ for(i=0; i<ss->num_sprites; i++) {
+ free(ss->sprites[i].ops);
+ }
+ free(ss->sprites);
+}
+
+int load_sprites(struct sprites *ss, const char *fname)
+{
+ int i;
+ FILE *fp;
+ struct file_header hdr;
+
+ ss->sprites = 0;
+
+ if(!(fp = fopen(fname, "rb"))) {
+ fprintf(stderr, "failed to load sprites from %s: %s\n", fname, strerror(errno));
+ return -1;
+ }
+ if(fread(&hdr, sizeof hdr, 1, fp) <= 0) {
+ fprintf(stderr, "unexpected EOF while reading from %s\n", fname);
+ goto err;
+ }
+ if(memcmp(hdr.magic, "RLESPRIT", sizeof hdr.magic) != 0) {
+ fprintf(stderr, "invalid magic in %s\n", fname);
+ goto err;
+ }
+
+ ss->width = hdr.width;
+ ss->height = hdr.height;
+ ss->bpp = hdr.bpp;
+ ss->num_sprites = hdr.count;
+
+ if(!(ss->sprites = malloc(hdr.count * sizeof *ss->sprites))) {
+ fprintf(stderr, "failed to allocate %d sprites for %s\n", hdr.count, fname);
+ goto err;
+ }
+
+ for(i=0; i<ss->num_sprites; i++) {
+ if(read_sprite(ss->sprites + i, (hdr.bpp + 7) / 8, fp) == -1) {
+ goto err;
+ }
+ }
+
+ fclose(fp);
+ return 0;
+
+err:
+ free(ss->sprites);
+ fclose(fp);
+ return -1;
+}
+
+static int read_sprite(struct sprite *spr, int pixsz, FILE *fp)
+{
+ int i, idx, max_ops, newmax, len, bufsz;
+ void *tmp;
+ uint32_t op;
+
+ spr->ops = 0;
+ spr->num_ops = max_ops = 0;
+
+ do {
+ /* read the op */
+ if(fread(&op, sizeof op, 1, fp) <= 0) {
+ free(spr->ops);
+ return -1;
+ }
+
+ /* realloc ops array if necessary */
+ if(spr->num_ops >= max_ops) {
+ newmax = max_ops ? max_ops << 1 : 16;
+ if(!(tmp = realloc(spr->ops, newmax * sizeof *spr->ops))) {
+ fprintf(stderr, "failed to add sprite op (newmax: %d)\n", newmax);
+ goto err;
+ }
+ spr->ops = tmp;
+ max_ops = newmax;
+ }
+
+ /* append */
+ idx = spr->num_ops++;
+ spr->ops[idx].op = SOP_OP(op);
+ len = SOP_LEN(op);
+ bufsz = len * pixsz;
+ spr->ops[idx].size = bufsz;
+
+ /* if the op was copy, we need to grab the pixel data */
+ if(SOP_OP(op) == SOP_COPY) {
+ if(!(tmp = malloc(bufsz))) {
+ fprintf(stderr, "failed to allocate sprite pixel data (%d bytes)\n", bufsz);
+ goto err;
+ }
+ if(fread(tmp, 1, bufsz, fp) < bufsz) {
+ fprintf(stderr, "unexpected EOF while trying to read sprite data (%d pixels)\n", len);
+ goto err;
+ }
+ spr->ops[idx].data = tmp;
+ } else {
+ spr->ops[idx].data = 0;
+ }
+
+ } while(SOP_OP(op) != SOP_END);
+
+ return 0;
+
+err:
+ for(i=0; i<spr->num_ops; i++) {
+ free(spr->ops[i].data);
+ }
+ free(spr->ops);
+ return -1;
+}
--- /dev/null
+#ifndef SPRITE_H_
+#define SPRITE_H_
+
+enum {
+ SOP_END,
+ SOP_ENDL,
+ SOP_SKIP,
+ SOP_RESVD,
+ SOP_COPY
+};
+
+#define SOP_OP(op) ((op) & 0xff)
+#define SOP_LEN(op) ((op) >> 16)
+
+struct sprite_op {
+ unsigned char op;
+ unsigned short size;
+ void *data;
+};
+
+struct sprite {
+ struct sprite_op *ops;
+ int num_ops;
+};
+
+struct sprites {
+ int width, height, bpp;
+
+ struct sprite *sprites;
+ int num_sprites;
+};
+
+void destroy_sprites(struct sprites *ss);
+
+int load_sprites(struct sprites *ss, const char *fname);
+
+#endif /* SPRITE_H_ */
--- /dev/null
+#!/bin/sh
+
+[ -f ./procdata ] && cd ..
+if [ ! -f tools/procdata ]; then
+ echo 'run from the demo root directory' >&2
+ exit 1
+fi
+
+# process embedded images
+#if [ ! -f tools/img2bin/img2bin ]; then
+# make -C tools/img2bin || exit 1
+#fi
+#alias img2bin=tools/img2bin/img2bin
+#
+#mkdir -p data
+#if [ ! -f data/loading.img -o data/loading.png -nt data/loading.img ]; then
+# echo 'img2bin: loading'
+# img2bin data/loading.png || exit 1
+#fi
+
+# process RLE sprites
+if [ ! -f tools/rlesprite/rlesprite ]; then
+ make -C tools/rlesprite || exit 1
+fi
+alias rlesprite=tools/rlesprite/rlesprite
+
+if [ ! -f data/dbgfont.spr -o data/legible.fnt -nt data/dbgfont.spr ]; then
+ echo 'rlesprite: dbgfont'
+ rlesprite -o data/dbgfont.spr -s 8x16 -conv565 data/legible.fnt
+fi
--- /dev/null
+src = $(wildcard src/*.c)
+obj = $(src:.c=.o)
+bin = rlesprite
+
+CFLAGS = -pedantic -Wall -g
+LDFLAGS = -lpng -lz
+
+$(bin): $(obj)
+ $(CC) -o $@ $(obj) $(LDFLAGS)
+
+.PHONY: clean
+clean:
+ rm -f $(obj) $(bin)
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <png.h>
+#include "image.h"
+
+int alloc_image(struct image *img, int x, int y, int bpp)
+{
+ memset(img, 0, sizeof *img);
+ img->width = x;
+ img->height = y;
+ img->bpp = bpp;
+ img->scansz = img->pitch = x * bpp / 8;
+
+ if(!(img->pixels = malloc(y * img->scansz))) {
+ printf("failed to allocate %dx%d (%dbpp) pixel buffer\n", x, y, bpp);
+ return -1;
+ }
+
+ /* just a guess, assume the user will fill the details, but set up reasonable
+ * defaults just in case...
+ */
+ if(bpp <= 8) {
+ img->nchan = 1;
+ img->cmap_ncolors = 1 << bpp;
+ } else if(bpp <= 24) {
+ img->nchan = 3;
+ } else {
+ img->nchan = 4;
+ }
+ return 0;
+}
+
+int load_image(struct image *img, const char *fname)
+{
+ int i;
+ FILE *fp;
+ png_struct *png;
+ png_info *info;
+ int chan_bits, color_type;
+ png_uint_32 xsz, ysz;
+ png_color *palette;
+ unsigned char **scanline;
+ unsigned char *dptr;
+
+ if(!(fp = fopen(fname, "rb"))) {
+ printf("failed to open: %s: %s\n", fname, strerror(errno));
+ return -1;
+ }
+
+ if(!(png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0))) {
+ fclose(fp);
+ return -1;
+ }
+ if(!(info = png_create_info_struct(png))) {
+ fclose(fp);
+ png_destroy_read_struct(&png, 0, 0);
+ return -1;
+ }
+ if(setjmp(png_jmpbuf(png))) {
+ fclose(fp);
+ png_destroy_read_struct(&png, &info, 0);
+ return -1;
+ }
+
+ png_init_io(png, fp);
+ png_read_png(png, info, 0, 0);
+
+ png_get_IHDR(png, info, &xsz, &ysz, &chan_bits, &color_type, 0, 0, 0);
+ img->width = xsz;
+ img->height = ysz;
+ img->nchan = png_get_channels(png, info);
+ img->bpp = img->nchan * chan_bits;
+ img->scansz = img->pitch = xsz * img->bpp / 8;
+ img->cmap_ncolors = 0;
+
+ if(color_type == PNG_COLOR_TYPE_PALETTE) {
+ png_get_PLTE(png, info, &palette, &img->cmap_ncolors);
+ memcpy(img->cmap, palette, img->cmap_ncolors * sizeof *img->cmap);
+ }
+
+ if(!(img->pixels = malloc(ysz * img->scansz))) {
+ perror("failed to allocate pixel buffer");
+ fclose(fp);
+ png_destroy_read_struct(&png, &info, 0);
+ return -1;
+ }
+ dptr = img->pixels;
+
+ scanline = (unsigned char**)png_get_rows(png, info);
+ for(i=0; i<ysz; i++) {
+ memcpy(dptr, scanline[i], img->scansz);
+ dptr += img->pitch;
+ }
+
+ fclose(fp);
+ png_destroy_read_struct(&png, &info, 0);
+ return 0;
+}
+
+int save_image(struct image *img, const char *fname)
+{
+ int i, chan_bits, coltype;
+ FILE *fp;
+ png_struct *png;
+ png_info *info;
+ png_text txt;
+ unsigned char **scanline = 0;
+ unsigned char *pptr;
+
+ if(!(fp = fopen(fname, "wb"))) {
+ printf("save_image: failed to open: %s: %s\n", fname, strerror(errno));
+ return -1;
+ }
+
+ if(!(png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0))) {
+ fclose(fp);
+ return -1;
+ }
+ if(!(info = png_create_info_struct(png))) {
+ png_destroy_write_struct(&png, 0);
+ fclose(fp);
+ return -1;
+ }
+
+ txt.compression = PNG_TEXT_COMPRESSION_NONE;
+ txt.key = "Software";
+ txt.text = "img2tiles";
+ txt.text_length = 0;
+
+ if(setjmp(png_jmpbuf(png))) {
+ png_destroy_write_struct(&png, &info);
+ free(scanline);
+ fclose(fp);
+ return -1;
+ }
+
+ switch(img->nchan) {
+ case 1:
+ if(img->cmap_ncolors > 0) {
+ coltype = PNG_COLOR_TYPE_PALETTE;
+ } else {
+ coltype = PNG_COLOR_TYPE_GRAY;
+ }
+ break;
+ case 2:
+ coltype = PNG_COLOR_TYPE_GRAY_ALPHA;
+ break;
+ case 3:
+ coltype = PNG_COLOR_TYPE_RGB;
+ break;
+ case 4:
+ coltype = PNG_COLOR_TYPE_RGB_ALPHA;
+ break;
+ }
+
+ chan_bits = img->bpp / img->nchan;
+ png_set_IHDR(png, info, img->width, img->height, chan_bits, coltype, PNG_INTERLACE_NONE,
+ PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+ png_set_text(png, info, &txt, 1);
+
+ if(img->cmap_ncolors > 0) {
+ png_set_PLTE(png, info, (png_color*)img->cmap, img->cmap_ncolors);
+ }
+
+ if(!(scanline = malloc(img->height * sizeof *scanline))) {
+ png_destroy_write_struct(&png, &info);
+ fclose(fp);
+ return -1;
+ }
+
+ pptr = img->pixels;
+ for(i=0; i<img->height; i++) {
+ scanline[i] = pptr;
+ pptr += img->pitch;
+ }
+ png_set_rows(png, info, scanline);
+
+ png_init_io(png, fp);
+ png_write_png(png, info, 0, 0);
+ png_destroy_write_struct(&png, &info);
+ free(scanline);
+ fclose(fp);
+ return 0;
+}
+
+int conv_image_rgb565(struct image *img16, struct image *img)
+{
+ int i, j;
+ uint16_t *dptr;
+ unsigned char *sptr;
+
+ if(!img->cmap_ncolors && img->bpp < 24) {
+ fprintf(stderr, "unsupported conversion from %dbpp to 16bpp 565\n", img->bpp);
+ return -1;
+ }
+
+ img16->width = img->width;
+ img16->height = img->height;
+ img16->nchan = img->nchan;
+ img16->bpp = 16;
+ img16->scansz = img16->pitch = img->width * 2;
+ if(!(img16->pixels = malloc(img16->height * img16->scansz))) {
+ return -1;
+ }
+
+ sptr = img->pixels;
+ dptr = (uint16_t*)img16->pixels;
+
+ for(i=0; i<img->height; i++) {
+ for(j=0; j<img->width; j++) {
+ unsigned int r, g, b;
+ if(img->bpp <= 8 && img->cmap_ncolors) {
+ int idx = *sptr++ % img->cmap_ncolors;
+ r = img->cmap[idx].r >> 3;
+ g = img->cmap[idx].g >> 2;
+ b = img->cmap[idx].b >> 3;
+ } else if(img->nchan == 1) {
+ g = (*sptr++ >> 2) & 0x3f;
+ r = b = g >> 1;
+ } else {
+ r = (*sptr++ >> 3) & 0x1f;
+ g = (*sptr++ >> 2) & 0x3f;
+ b = (*sptr++ >> 3) & 0x1f;
+ }
+ *dptr++ = (r << 11) | (g << 5) | b;
+ }
+ }
+ return 0;
+}
+
+
+int cmp_image(struct image *a, struct image *b)
+{
+ int i;
+ unsigned char *aptr = a->pixels;
+ unsigned char *bptr = b->pixels;
+
+ if(a->width != b->width || a->height != b->height || a->bpp != b->bpp || a->nchan != b->nchan) {
+ return -1;
+ }
+
+ for(i=0; i<a->height; i++) {
+ if(memcmp(aptr, bptr, a->scansz) != 0) {
+ return -1;
+ }
+ aptr += a->pitch;
+ bptr += b->pitch;
+ }
+ return 0;
+}
+
+void blit_image(struct image *src, int sx, int sy, int w, int h, struct image *dst, int dx, int dy)
+{
+ int i;
+ unsigned char *sptr, *dptr;
+
+ assert(src->bpp == dst->bpp);
+ assert(src->nchan == dst->nchan);
+
+ if(sx < 0) { w += sx; sx = 0; }
+ if(sy < 0) { h += sy; sy = 0; }
+ if(dx < 0) { w += dx; sx -= dx; dx = 0; }
+ if(dy < 0) { h += dy; sy -= dy; dy = 0; }
+ if(sx + w >= src->width) w = src->width - sx;
+ if(sy + h >= src->height) h = src->height - sy;
+ if(dx + w >= dst->width) w = dst->width - dx;
+ if(dy + h >= dst->height) h = dst->height - dy;
+
+ if(w <= 0 || h <= 0) return;
+
+ sptr = src->pixels + sy * src->pitch + sx * src->bpp / 8;
+ dptr = dst->pixels + dy * dst->pitch + dx * dst->bpp / 8;
+
+ for(i=0; i<h; i++) {
+ memcpy(dptr, sptr, w * dst->bpp / 8);
+ dptr += dst->pitch;
+ sptr += src->pitch;
+ }
+}
+
+void image_color_offset(struct image *img, int offs)
+{
+ int i, sz = img->height * img->pitch;
+ unsigned char *pptr = img->pixels;
+
+ for(i=0; i<sz; i++) {
+ *pptr++ += offs;
+ }
+}
--- /dev/null
+#ifndef IMAGE_H_
+#define IMAGE_H_
+
+struct cmapent {
+ unsigned char r, g, b;
+};
+
+struct image {
+ int width, height;
+ int bpp;
+ int nchan;
+ int scansz, pitch;
+ int cmap_ncolors;
+ struct cmapent cmap[256];
+ unsigned char *pixels;
+};
+
+int alloc_image(struct image *img, int x, int y, int bpp);
+int load_image(struct image *img, const char *fname);
+int save_image(struct image *img, const char *fname);
+
+int conv_image_rgb565(struct image *img16, struct image *img);
+
+int cmp_image(struct image *a, struct image *b);
+
+void blit_image(struct image *src, int sx, int sy, int w, int h, struct image *dst, int dx, int dy);
+
+void image_color_offset(struct image *img, int offs);
+
+#endif /* IMAGE_H_ */
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+#include <assert.h>
+#include <alloca.h>
+#include "image.h"
+
+#define MAGIC "RLESPRIT"
+
+struct file_header {
+ char magic[8];
+ uint16_t width, height, bpp;
+ uint16_t count;
+} __attribute__((packed));
+
+enum {
+ CSOP_END,
+ CSOP_ENDL,
+ CSOP_SKIP,
+ CSOP_FILL,
+ CSOP_COPY
+};
+
+struct csop {
+ unsigned char op;
+ unsigned char padding;
+ uint16_t len;
+} __attribute__((packed));
+
+
+struct rect {
+ int x, y, w, h;
+};
+
+int rlesprite(struct image *img, int x, int y, int xsz, int ysz);
+int proc_sheet(const char *fname);
+void print_usage(const char *argv0);
+
+int tile_xsz, tile_ysz;
+struct rect rect;
+int cmap_offs;
+int ckey;
+int conv565;
+int padding;
+FILE *outfp;
+
+int main(int argc, char **argv)
+{
+ int i;
+ char *endp;
+ const char *name = 0;
+
+ for(i=1; i<argc; i++) {
+ if(argv[i][0] == '-') {
+ if(strcmp(argv[i], "-s") == 0 || strcmp(argv[i], "-size") == 0) {
+ if(sscanf(argv[++i], "%dx%d", &tile_xsz, &tile_ysz) != 2 ||
+ tile_xsz <= 0 || tile_ysz <= 0) {
+ fprintf(stderr, "%s must be followed by WIDTHxHEIGHT\n", argv[i - 1]);
+ return 1;
+ }
+
+ } else if(strcmp(argv[i], "-r") == 0 || strcmp(argv[i], "-rect") == 0) {
+ rect.x = rect.y = 0;
+ if(sscanf(argv[++i], "%dx%d+%d+%d", &rect.w, &rect.h, &rect.x, &rect.y) < 2 || rect.w <= 0 || rect.h <= 0) {
+ fprintf(stderr, "%s must be followed by WIDTHxHEIGHT+X+Y\n", argv[i - 1]);
+ return 1;
+ }
+
+ } else if(strcmp(argv[i], "-p") == 0 || strcmp(argv[i], "-pad") == 0) {
+ padding = strtol(argv[++i], &endp, 10);
+ if(endp == argv[i] || padding < 0) {
+ fprintf(stderr, "%s must be followed by a positive number\n", argv[i - 1]);
+ return 1;
+ }
+
+ } else if(strcmp(argv[i], "-coffset") == 0) {
+ cmap_offs = strtol(argv[++i], &endp, 10);
+ if(endp == argv[i] || cmap_offs < 0 || cmap_offs >= 256) {
+ fprintf(stderr, "-coffset must be followed by a valid colormap offset\n");
+ return 1;
+ }
+
+ } else if(strcmp(argv[i], "-o") == 0) {
+ if(!argv[++i]) {
+ fprintf(stderr, "%s must be followed by an output filename\n", argv[i - 1]);
+ return 1;
+ }
+ if(name && strcmp(name, argv[i]) != 0) {
+ if(outfp) {
+ fclose(outfp);
+ outfp = 0;
+ }
+ }
+ name = argv[i];
+
+ } else if(strcmp(argv[i], "-k") == 0 || strcmp(argv[i], "-key") == 0) {
+ ckey = strtol(argv[++i], &endp, 10);
+ if(endp == argv[i] || ckey < 0) {
+ fprintf(stderr, "%s must be followed by a valid color key\n", argv[i - 1]);
+ return 1;
+ }
+
+ } else if(strcmp(argv[i], "-conv565") == 0) {
+ conv565 = 1;
+
+ } else if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "-help") == 0) {
+ print_usage(argv[0]);
+ return 0;
+
+ } else {
+ fprintf(stderr, "invalid option: %s\n", argv[i]);
+ print_usage(argv[0]);
+ return 1;
+ }
+
+ } else {
+ if(!outfp) {
+ if(name) {
+ if(!(outfp = fopen(name, "wb"))) {
+ fprintf(stderr, "failed to open output file: %s: %s\n", name, strerror(errno));
+ return 1;
+ }
+ } else {
+ outfp = stdout;
+ }
+ }
+
+ if(proc_sheet(argv[i]) == -1) {
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+int proc_sheet(const char *fname)
+{
+ int i, j, x, y, num_xtiles, num_ytiles, xsz, ysz;
+ struct image img;
+ struct file_header hdr;
+
+ if(load_image(&img, fname) == -1) {
+ fprintf(stderr, "failed to load image: %s\n", fname);
+ return -1;
+ }
+ if(conv565) {
+ struct image tmp;
+ if(conv_image_rgb565(&tmp, &img) == -1) {
+ fprintf(stderr, "failed to convert image to 16bpp 565: %s\n", fname);
+ free(img.pixels);
+ return -1;
+ }
+ free(img.pixels);
+ img = tmp;
+ }
+
+ if(rect.w <= 0) {
+ rect.w = img.width;
+ rect.h = img.height;
+ }
+
+ if(tile_xsz <= 0) {
+ num_xtiles = num_ytiles = 1;
+ xsz = rect.w - padding;
+ ysz = rect.h - padding;
+ } else {
+ if(padding) {
+ num_xtiles = num_ytiles = 0;
+ i = 0;
+ while(i < rect.w) {
+ num_xtiles++;
+ i += tile_xsz + padding;
+ }
+ i = 0;
+ while(i < rect.h) {
+ num_ytiles++;
+ i += tile_ysz + padding;
+ }
+ } else {
+ num_xtiles = rect.w / tile_xsz;
+ num_ytiles = rect.h / tile_ysz;
+ }
+ xsz = tile_xsz;
+ ysz = tile_ysz;
+ }
+
+ memcpy(hdr.magic, MAGIC, sizeof hdr.magic);
+ hdr.width = xsz;
+ hdr.height = ysz;
+ hdr.bpp = img.bpp;
+ hdr.count = num_xtiles * num_ytiles;
+ fwrite(&hdr, sizeof hdr, 1, outfp);
+
+ y = rect.y;
+ for(i=0; i<num_ytiles; i++) {
+ x = rect.x;
+ for(j=0; j<num_xtiles; j++) {
+ rlesprite(&img, x, y, xsz, ysz);
+ x += xsz + padding;
+ }
+ y += ysz + padding;
+ }
+
+ free(img.pixels);
+ return 0;
+}
+
+int rlesprite(struct image *img, int x, int y, int xsz, int ysz)
+{
+ int i, j, numops, mode, new_mode, start, skip_acc, pixsz = img->bpp / 8;
+ unsigned char *pptr = img->pixels + y * img->scansz + x * pixsz;
+ struct csop *ops, *optr, endop = {0};
+
+ ops = optr = alloca((xsz + 1) * ysz * sizeof *ops);
+
+ for(i=0; i<ysz; i++) {
+ mode = -1;
+ start = -1;
+
+ if(i > 0) {
+ optr++->op = CSOP_ENDL;
+ }
+
+ for(j=0; j<xsz; j++) {
+ if(memcmp(pptr, &ckey, pixsz) == 0) {
+ new_mode = CSOP_SKIP;
+ } else {
+ new_mode = CSOP_COPY;
+ }
+
+ if(new_mode != mode) {
+ if(mode != -1) {
+ assert(start >= 0);
+ optr->op = mode;
+ optr->len = j - start;
+ optr++;
+ }
+ mode = new_mode;
+ start = j;
+ }
+ pptr += pixsz;
+ }
+ pptr += img->scansz - xsz * pixsz;
+
+ if(mode != -1) {
+ assert(start >= 0);
+ optr->op = mode;
+ optr->len = xsz - start;
+ optr++;
+ }
+ }
+ numops = optr - ops;
+
+ pptr = img->pixels + y * img->scansz + x * img->bpp / 8;
+ optr = ops;
+ skip_acc = 0;
+
+ for(i=0; i<numops; i++) {
+ switch(optr->op) {
+ case CSOP_SKIP:
+ skip_acc += optr->len;
+ pptr += optr->len * pixsz;
+ break;
+
+ case CSOP_ENDL:
+ /* maybe at some point combine multiple endl into yskips? meh */
+ fwrite(optr, sizeof *optr, 1, outfp);
+ skip_acc = 0;
+ pptr += img->scansz - xsz * pixsz;
+ break;
+
+ case CSOP_COPY:
+ if(skip_acc) {
+ struct csop skip = {0};
+ skip.op = CSOP_SKIP;
+ skip.len = skip_acc;
+ fwrite(&skip, sizeof skip, 1, outfp);
+ skip_acc = 0;
+ }
+
+ fwrite(optr, sizeof *optr, 1, outfp);
+ fwrite(pptr, pixsz, optr->len, outfp);
+
+ pptr += optr->len;
+ break;
+
+ default:
+ fprintf(stderr, "invalid op\n");
+ }
+ optr++;
+ }
+
+ endop.op = CSOP_END;
+ fwrite(&endop, sizeof endop, 1, outfp);
+ return 0;
+}
+
+void print_usage(const char *argv0)
+{
+ printf("Usage: %s [options] <spritesheet>\n", argv0);
+ printf("Options:\n");
+ printf(" -o <filename>: output filename (default: stdout)\n");
+ printf(" -s,-size <WxH>: tile size (default: whole image)\n");
+ printf(" -r,-rect <WxH+X+Y>: use rectangle of the input image (default: whole image)\n");
+ printf(" -p,-pad <N>: how many pixels to skip between tiles in source image (default: 0)\n");
+ printf(" -coffset <offs>: colormap offset [0, 255] (default: 0)\n");
+ printf(" -k,-key <color>: color-key for transparency (default: 0)\n");
+ printf(" -conv565: convert image to 16bpp 565 before processing\n");
+ printf(" -h: print usage and exit\n");
+}
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