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++;
}
}
bool ProceduralTexture::loadPNG(char *png_map)
{
LodePNG::Decoder pngDecoder;
std::vector<unsigned char> buffer;
Logger::log("Loading png file %s..\n",png_map);
LodePNG::loadFile(buffer,png_map);
Logger::log("Calling PNG decoder..\n");
pngDecoder.decode(image, buffer);
Logger::log("Checking decoder state..\n");
if(pngDecoder.hasError())
{
Logger::log("[loadTextureFromPng] Error %d\n", pngDecoder.getError());
Logger::log(" while trying to load \'%s\'\n",png_map);
return false;
}
width = pngDecoder.getWidth();
height = pngDecoder.getHeight();
Logger::log("PNG Decoder Info [ width: %d, height: %d ]..\n",width,height);
Logger::log("image size: %d\n",image.size());
Logger::log("isGreyScale: %s\n",pngDecoder.isGreyscaleType()?"true":"false");
Logger::log("isAlphaType: %s\n",pngDecoder.isAlphaType()?"true":"false");
Logger::log("Channels: %d\n",pngDecoder.getChannels());
Logger::log("BPP: %d\n",pngDecoder.getBpp());
return true;
}
//lodepng용 추가 함수
static void PrintLog(LodePNG::Decoder &decoder) {
if(decoder.hasError()) {
std::cout << "error " << decoder.getError() << ": " << LodePNG_error_text(decoder.getError()) << std::endl;
} else {
std::cout << "\n" <<
"w: " << decoder.getWidth() << "\n" <<
"h: " << decoder.getHeight() << "\n" <<
"bitDepth: " << decoder.getInfoPng().color.bitDepth << "\n" <<
"bpp: " << decoder.getBpp() << "\n" <<
"colorChannels: " << decoder.getChannels() << "\n" <<
"paletteSize: " << decoder.getInfoPng().color.palettesize / 4 << "\n" <<
"colorType: " << decoder.getInfoPng().color.colorType << "\n" <<
"compressionMethod: " << decoder.getInfoPng().compressionMethod << "\n" <<
"filterMethod: " << decoder.getInfoPng().filterMethod << "\n" <<
"interlaceMethod: " << decoder.getInfoPng().interlaceMethod << "\n";
for(size_t i = 0; i < decoder.getInfoPng().text.num; i++) {
std::cout << decoder.getInfoPng().text.keys[i] << ": " << decoder.getInfoPng().text.strings[i] << "\n";
}
}
}
static bool Load(Image *img, ImageDesc *desc, uchar *data, int data_size) {
//lodepng를 기반으로 적절히 로딩하기
SR_ASSERT(data != NULL);
SR_ASSERT(data_size > 0);
img->image_data_.clear();
LodePNG::Decoder decoder;
decoder.decode(img->image_data(), data, data_size);
if(decoder.hasError()) {
return false;
} else {
desc->width = decoder.getWidth();
desc->height = decoder.getHeight();
desc->bit_depth = decoder.getInfoPng().color.bitDepth;
desc->bpp = decoder.getBpp();
desc->color_channels = decoder.getChannels();
desc->is_grayscale = decoder.isGreyscaleType() > 0 ? true : false;
desc->is_alpha = decoder.isAlphaType() > 0 ? true : false;
return true;
}
}