78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
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#include <stdlib.h>
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#include <libguile.h>
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#include <cgif.h>
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#include <cairo.h>
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const uint8_t PALETTE[] = {
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0xFF, 0xFF, 0xFF, // WHITE
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0x00, 0x00, 0x00, // BLACK
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0xFF, 0x00, 0x00 // RED
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};
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#define CAIRO_RED 0x00FF0000
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#define CAIRO_BLACK 0x00FFFFFF
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void encode_frame(cairo_surface_t *surface, CGIF_FrameConfig *frameconfig) {
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// TODO pull colors from cairo
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size_t size = cairo_image_surface_get_width(surface) * cairo_image_surface_get_height(surface);
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frameconfig->pLocalPalette = (uint8_t*) &PALETTE;
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frameconfig->numLocalPaletteEntries = 3;
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frameconfig->pImageData = (uint8_t*)calloc(size, sizeof(uint8_t));
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if (cairo_image_surface_get_format(surface) == CAIRO_FORMAT_RGB24) {
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unsigned char* pen = cairo_image_surface_get_data(surface);
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for (size_t i = 0; i < size; i++) {
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uint32_t cairo_color = (uint32_t)(*(pen + i * sizeof(uint32_t) * cairo_image_surface_get_stride(surface)));
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switch (cairo_color) {
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case CAIRO_BLACK:
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frameconfig->pImageData[i] = 1;
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break;
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case CAIRO_RED:
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frameconfig->pImageData[i] = 2;
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break;
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}
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}
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}
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}
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void make_gif_inner(cairo_surface_t *frames[], size_t n_frames, const char* path) {
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CGIF_Config cgif_config;
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cgif_config.path = path;
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cgif_config.attrFlags = CGIF_ATTR_IS_ANIMATED | CGIF_ATTR_NO_GLOBAL_TABLE;
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cgif_config.width = cairo_image_surface_get_width(frames[0]);
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cgif_config.height = cairo_image_surface_get_height(frames[0]);
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CGIF *cgif = cgif_newgif(&cgif_config);
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for (size_t i = 0; i < n_frames; i++) {
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cairo_surface_t *frame = frames[i];
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// Flush pending writes
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cairo_surface_flush(frame);
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CGIF_FrameConfig cgif_frameconfig;
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cgif_frameconfig.attrFlags = CGIF_FRAME_ATTR_USE_LOCAL_TABLE;
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cgif_frameconfig.delay = 100;
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encode_frame(frame, &cgif_frameconfig);
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cgif_addframe(cgif, &cgif_frameconfig);
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}
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cgif_close(cgif);
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}
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void make_gif(SCM frames, SCM path) {
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size_t c_length = scm_c_array_length(frames);
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scm_t_array_handle c_array;
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scm_array_get_handle(frames, &c_array);
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cairo_surface_t **c_frames = scm_array_handle_uniform_elements(&c_array);
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const char* c_path = scm_to_locale_string(path);
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make_gif_inner(c_frames, c_length, c_path);
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scm_array_handle_release(&c_array);
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}
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void init_cgif() {
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scm_c_define_gsubr("make-gif", 2, 0, 0, &make_gif);
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}
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