void LoadPng(const char *path) {
PngT *png = PngLoadFromFile(path);
if (png) {
PixBufT *pixbuf;
int16_t type;
puts("IHDR:");
printf(" width : %d\n", png->ihdr.width);
printf(" height : %d\n", png->ihdr.height);
printf(" bit depth : %d\n", png->ihdr.bit_depth);
printf(" color type : ");
if (png->ihdr.colour_type == PNG_GRAYSCALE) {
type = PIXBUF_GRAY;
puts("gray scale");
} else if (png->ihdr.colour_type == PNG_TRUECOLOR) {
type = PIXBUF_RGB;
puts("true color");
} else if (png->ihdr.colour_type == PNG_INDEXED) {
type = PIXBUF_CLUT;
puts("indexed color");
} else if (png->ihdr.colour_type == PNG_GRAYSCALE_ALPHA) {
type = PIXBUF_GRAY;
puts("gray scale (with alpha)");
} else {
type = PIXBUF_RGBA;
puts("true color (with alpha)");
}
printf(" interlace : %s\n", png->ihdr.interlace_method ? "yes" : "no");
if (png->plte.no_colors) {
puts("PLTE:");
printf(" colors : %d\n", png->plte.no_colors);
}
if (png->trns) {
puts("tRNS:");
if (png->ihdr.colour_type == PNG_INDEXED)
printf(" color : %d\n", png->trns->type3.alpha[0]);
}
pixbuf = NewPixBuf(type, png->ihdr.width, png->ihdr.height);
PngDecodeImage(png, pixbuf);
MemUnref(pixbuf);
}
puts("");
MemUnref(png);
}
static PixBufT *PngToPixBuf(PngT *png) {
PixBufT *pixbuf = NULL;
if (png->ihdr.bit_depth == 8) {
int16_t type;
switch (png->ihdr.colour_type) {
case PNG_GRAYSCALE:
type = PIXBUF_GRAY;
break;
case PNG_INDEXED:
type = PIXBUF_CLUT;
break;
default:
type = -1;
break;
}
if (type >= 0) {
pixbuf = NewPixBuf(type, png->ihdr.width, png->ihdr.height);
if (!PngDecodeImage(png, pixbuf)) {
MemUnref(pixbuf);
pixbuf = NULL;
} else {
PixBufCalculateHistogram(pixbuf);
LOG("The image has %d (%d..%d) colors.",
(int)pixbuf->lastColor - (int)pixbuf->baseColor + 1,
pixbuf->baseColor, pixbuf->lastColor);
if (png->trns) {
pixbuf->mode = BLIT_TRANSPARENT;
pixbuf->baseColor = png->trns->type3.alpha[0];
LOG("The image is transparent (color = %d).", pixbuf->baseColor);
}
}
}
}
return pixbuf;
}