80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
#include <stdlib.h>
|
|
#include <guile-cairo.h>
|
|
#include <cgif.h>
|
|
#include <string.h>
|
|
|
|
const uint8_t PALETTE[] = {
|
|
0xFF, 0xFF, 0xFF, // WHITE
|
|
0x00, 0x00, 0x00, // BLACK
|
|
0xFF, 0x00, 0x00 // RED
|
|
};
|
|
|
|
#define CAIRO_RED 0x00FF0000
|
|
#define CAIRO_BLACK 0x00000000
|
|
|
|
void encode_frame(cairo_surface_t *surface, CGIF_FrameConfig *frameconfig) {
|
|
// TODO pull colors from cairo
|
|
size_t size = cairo_image_surface_get_width(surface) * cairo_image_surface_get_height(surface);
|
|
frameconfig->pLocalPalette = (uint8_t*) &PALETTE;
|
|
frameconfig->numLocalPaletteEntries = 3;
|
|
frameconfig->pImageData = (uint8_t*)calloc(size, sizeof(uint8_t));
|
|
|
|
if (cairo_image_surface_get_format(surface) == CAIRO_FORMAT_RGB24) {
|
|
uint32_t* pen = (uint32_t*) cairo_image_surface_get_data(surface);
|
|
for (size_t i = 0; i < size; i++) {
|
|
uint32_t cairo_color = pen[i];
|
|
switch (cairo_color & 0x00FFFFFF) {
|
|
case CAIRO_BLACK:
|
|
frameconfig->pImageData[i] = 1;
|
|
break;
|
|
case CAIRO_RED:
|
|
frameconfig->pImageData[i] = 2;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void make_gif_inner(cairo_surface_t *frames[], size_t n_frames, const char* path) {
|
|
CGIF_Config cgif_config;
|
|
memset(&cgif_config, 0, sizeof(CGIF_Config));
|
|
cgif_config.path = path;
|
|
cgif_config.attrFlags = CGIF_ATTR_IS_ANIMATED | CGIF_ATTR_NO_GLOBAL_TABLE;
|
|
cgif_config.width = cairo_image_surface_get_width(frames[0]);
|
|
cgif_config.height = cairo_image_surface_get_height(frames[0]);
|
|
|
|
CGIF *cgif = cgif_newgif(&cgif_config);
|
|
|
|
for (size_t i = 0; i < n_frames; i++) {
|
|
cairo_surface_t *frame = frames[i];
|
|
// Flush pending writes
|
|
cairo_surface_flush(frame);
|
|
|
|
CGIF_FrameConfig cgif_frameconfig;
|
|
memset(&cgif_frameconfig, 0, sizeof(CGIF_FrameConfig));
|
|
cgif_frameconfig.attrFlags = CGIF_FRAME_ATTR_USE_LOCAL_TABLE;
|
|
cgif_frameconfig.delay = 100;
|
|
|
|
encode_frame(frame, &cgif_frameconfig);
|
|
cgif_addframe(cgif, &cgif_frameconfig);
|
|
}
|
|
|
|
cgif_close(cgif);
|
|
}
|
|
|
|
SCM make_gif(SCM frames, SCM path) {
|
|
size_t n_frames = scm_to_size_t(scm_length(frames));
|
|
cairo_surface_t **c_frames = (cairo_surface_t **) malloc(sizeof(cairo_surface_t*) * n_frames);
|
|
for (size_t i = 0; i < n_frames; i++) {
|
|
c_frames[i] = scm_to_cairo_surface(scm_list_ref(frames, scm_from_size_t(i)));
|
|
}
|
|
const char* c_path = scm_to_locale_string(path);
|
|
|
|
make_gif_inner(c_frames, n_frames, c_path);
|
|
return SCM_UNSPECIFIED;
|
|
}
|
|
|
|
void init_cgif() {
|
|
scm_c_define_gsubr("make-gif", 2, 0, 0, &make_gif);
|
|
}
|