// Reads Tiff Images
RGBAImage* RGBAImage::ReadTiff(char *filename)
{
RGBAImage *fimg = 0;
TIFF* tif = TIFFOpen(filename, "r");
char emsg[1024];
if (tif) {
TIFFRGBAImage img;
if (TIFFRGBAImageBegin(&img, tif, 0, emsg)) {
size_t npixels;
uint32* raster;
npixels = img.width * img.height;
raster = (uint32*) _TIFFmalloc(npixels * sizeof (uint32));
if (raster != NULL) {
if (TIFFRGBAImageGet(&img, raster, img.width, img.height)) {
// result is in ABGR
fimg = new RGBAImage(img.width, img.height);
for (int y = 0; y < img.height; y++) {
for (int x = 0; x < img.width; x++) {
fimg->Set(x,y, raster[x + y * img.width]);
}
}
}
_TIFFfree(raster);
}
}
TIFFRGBAImageEnd(&img);
} else {
TIFFError(filename, emsg);
}
return fimg;
}
static RGBAImage *ReadFromFile(const string &filename)
{
cout << "reading from file:" << filename << "\n";
vector<uint8_t> lodepng_image; //the raw pixels
unsigned width, height;
unsigned error = lodepng::decode(lodepng_image, width, height, filename.c_str());
if (error) {
cout << "decoder error " << error << ": " << lodepng_error_text(error) << endl;
return NULL;
}
//the pixels are now in the vector "image", 4 bytes per pixel,
//ordered RGBARGBA..., use it as texture, draw it, ...
cout << "width " << width << ", height " << height << "\n";
RGBAImage *rgbaimg = new RGBAImage(width,height,filename);
for(unsigned y = 0; y < height; y += 1) {
for(unsigned x = 0; x < width; x += 1) {
uint32_t red = lodepng_image[4 * y * width + 4 * x + 0]; //red
uint32_t green = lodepng_image[4 * y * width + 4 * x + 1]; //green
uint32_t blue = lodepng_image[4 * y * width + 4 * x + 2]; //blue
uint32_t alpha = lodepng_image[4 * y * width + 4 * x + 3]; //alpha
rgbaimg->Set( red, green, blue, alpha, y*width+x );
}
}
return rgbaimg;
}
