void Image::read_png(const char* filename)
{
std::vector<unsigned char> buffer, image;
//load the image file with given filename
LodePNG::loadFile(buffer, filename);
//decode the png
LodePNG::Decoder decoder;
decoder.decode(image, buffer.empty() ? 0 : &buffer[0], (unsigned)buffer.size());
if (decoder.getChannels()<3 || decoder.getBpp()<24) {
cerr << "Error: only color (RGBA), 8 bit per channel png images are supported." << endl;
cerr << "Either convert your image or change the sourcecode." << endl;
exit(1);
}
int w = decoder.getWidth();
int h = decoder.getHeight();
set_extent(w,h);
// now convert the image data
std::vector<unsigned char>::iterator imageIterator = image.begin();
Color *currentPixel = _pixel;
while (imageIterator != image.end()) {
currentPixel->r = (*imageIterator)/255.0;
imageIterator++;
currentPixel->g = (*imageIterator)/255.0;
imageIterator++;
currentPixel->b = (*imageIterator)/255.0;
imageIterator++;
// Let's just ignore the alpha channel
imageIterator++;
currentPixel++;
}
}
void RenderModel::
recompute_extent()
{
Signal::OperationDesc::Extent extent;
if (chain_)
extent = chain_->extent(target_marker_);
set_extent (extent);
}
