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108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
#include "tiny_xpm.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "log.h"
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struct index {
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char c;
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Uint32 color;
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};
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static SDL_bool find_color(struct index *index, int len, char c, Uint32 *color) {
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// there are typically very few color, so it's ok to iterate over the array
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for (int i = 0; i < len; ++i) {
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if (index[i].c == c) {
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*color = index[i].color;
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return SDL_TRUE;
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}
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}
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*color = 0;
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return SDL_FALSE;
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}
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// We encounter some problems with SDL2_image on MSYS2 (Windows),
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// so here is our own XPM parsing not to depend on SDL_image.
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//
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// We do not hardcode the binary image to keep some flexibility to replace the
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// icon easily (just by replacing icon.xpm).
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//
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// Parameter is not "const char *" because XPM formats are generally stored in a
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// (non-const) "char *"
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SDL_Surface *read_xpm(char *xpm[]) {
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#if SDL_ASSERT_LEVEL >= 2
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// patch the XPM to change the icon color in debug mode
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xpm[2] = ". c #CC00CC";
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#endif
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char *endptr;
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// *** No error handling, assume the XPM source is valid ***
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// (it's in our source repo)
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// Assertions are only checked in debug
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int width = strtol(xpm[0], &endptr, 10);
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int height = strtol(endptr + 1, &endptr, 10);
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int colors = strtol(endptr + 1, &endptr, 10);
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int chars = strtol(endptr + 1, &endptr, 10);
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// sanity checks
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SDL_assert(0 <= width && width < 256);
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SDL_assert(0 <= height && height < 256);
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SDL_assert(0 <= colors && colors < 256);
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SDL_assert(chars == 1); // this implementation does not support more
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// init index
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struct index index[colors];
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for (int i = 0; i < colors; ++i) {
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const char *line = xpm[1+i];
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index[i].c = line[0];
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SDL_assert(line[1] == '\t');
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SDL_assert(line[2] == 'c');
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SDL_assert(line[3] == ' ');
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if (line[4] == '#') {
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index[i].color = 0xff000000 | strtol(&line[5], &endptr, 0x10);
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SDL_assert(*endptr == '\0');
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} else {
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SDL_assert(!strcmp("None", &line[4]));
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index[i].color = 0;
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}
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}
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// parse image
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Uint32 *pixels = SDL_malloc(4 * width * height);
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if (!pixels) {
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LOGE("Could not allocate icon memory");
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return NULL;
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}
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for (int y = 0; y < height; ++y) {
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const char *line = xpm[1 + colors + y];
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for (int x = 0; x < width; ++x) {
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char c = line[x];
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Uint32 color;
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SDL_bool color_found = find_color(index, colors, c, &color);
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SDL_assert(color_found);
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pixels[y * width + x] = color;
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}
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}
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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Uint32 amask = 0x000000ff;
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Uint32 rmask = 0x0000ff00;
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Uint32 gmask = 0x00ff0000;
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Uint32 bmask = 0xff000000;
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#else // little endian, like x86
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Uint32 amask = 0xff000000;
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Uint32 rmask = 0x00ff0000;
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Uint32 gmask = 0x0000ff00;
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Uint32 bmask = 0x000000ff;
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#endif
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SDL_Surface *surface = SDL_CreateRGBSurfaceFrom(pixels,
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width, height,
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32, 4 * width,
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rmask, gmask, bmask, amask);
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// make the surface own the raw pixels
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surface->flags &= ~SDL_PREALLOC;
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return surface;
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}
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