int main() {
struct pixmap* img = pixmap_alloc(1600, 1200);
if (img == NULL) {
exit(EXIT_FAILURE); // error message is printed by pixmap_alloc()
}
double x = 0.666;
for (int p = 0; p < PIXMAP_COLORS*img->width*img->height; p++) {
x = 4 * x * (1.0 - x); // random numbers from chaotic logistic map
img->bytes[p] = 256 * x;
}
//pixmap_print(img);
pixmap_write_ppm(img, "pixmap.ppm");
pixmap_write_ppm_gz(img, "pixmap.ppm.gz");
pixmap_write_png(img, "pixmap.png");
pixmap_write_jpg(img, "pixmap.jpg");
img->chroma = PIXMAP_CHROMA_422;
img->quality = 40;
pixmap_write_jpg(img, "pixmap_c422_q40.jpg");
img->chroma = PIXMAP_CHROMA_411;
img->quality = 20;
pixmap_write_jpg(img, "pixmap_c411_q20.jpg");
pixmap_free(img);
return 0;
}
Pixmap *Pixmap_NewFrom(const void *src, int width, int height, int pitch, PixelFormat fmt, PixmapError *error)
{
Pixmap *pixmap;
if (!(pixmap = pixmap_alloc(width, height, pitch, fmt, error))) {
return NULL;
}
memcpy(pixmap->data, src, Pixmap_GetSize(pixmap));
return pixmap;
}
Pixmap *Pixmap_New(int width, int height, int pitch, PixelFormat fmt, PixmapError *error)
{
Pixmap *pixmap;
if (!(pixmap = pixmap_alloc(width, height, pitch, fmt, error))) {
return NULL;
}
memset(pixmap->data, 0, Pixmap_GetSize(pixmap));
return pixmap;
}