Function webpPacker

src/eepp/graphics/image.cpp:949–1006

}

std::vector<Uint8> webpPacker( const Image& img, Uint32 quality, Uint32 compressionMethod,
							   bool lossless ) {
	quality = eeclamp( quality, 0u, 100u );
	compressionMethod = eeclamp( quality, 0u, 6u );

	if ( img.getChannels() < 3 )
		return {};

	Sizei s( img.getWidth(), img.getHeight() );
	const Uint8* r = img.getPixelsPtr();

	WebPConfig config;
	WebPPicture pic;
	if ( !WebPConfigInit( &config ) || !WebPPictureInit( &pic ) ) {
		return {};
	}

	WebPMemoryWriter wrt;
	if ( lossless ) {
		config.lossless = 1;
		config.exact = 1;
	}
	config.method = compressionMethod;
	config.quality = quality;
	config.use_sharp_yuv = 1;
	pic.use_argb = 1;
	pic.width = s.getWidth();
	pic.height = s.getHeight();
	pic.writer = WebPMemoryWrite;
	pic.custom_ptr = &wrt;
	WebPMemoryWriterInit( &wrt );

	bool successImport = false;
	if ( img.getChannels() == 3 ) {
		successImport = WebPPictureImportRGB( &pic, r, 3 * s.getWidth() );
	} else {
		successImport = WebPPictureImportRGBA( &pic, r, 4 * s.getWidth() );
	}

	bool successEncode = false;
	if ( successImport ) {
		successEncode = WebPEncode( &config, &pic );
	}
	WebPPictureFree( &pic );

	if ( !successEncode ) {
		WebPMemoryWriterClear( &wrt );
		return {};
	}

	// copy from wrt
	std::vector<Uint8> dst;
	dst.resize( wrt.size );
	Uint8* w = dst.data();
	memcpy( w, wrt.mem, wrt.size );
	WebPMemoryWriterClear( &wrt );
	return dst;
}