void ImageDecoder::decompress(MipMap &out, const MipMap &in, PixelFormatRaw format) {
if ((format != kPixelFormatDXT1) &&
(format != kPixelFormatDXT3) &&
(format != kPixelFormatDXT5))
throw Common::Exception("Unknown compressed format %d", format);
/* The DXT algorithms work on 4x4 pixel blocks. Textures smaller than one
* block will be padded, but larger textures need to be correctly aligned. */
if (!hasValidDimensions(format, in.width, in.height))
throw Common::Exception("Invalid dimensions (%dx%d) for format %d", in.width, in.height, format);
out.width = in.width;
out.height = in.height;
out.size = out.width * out.height * 4;
out.data.reset(new byte[out.size]);
Common::ScopedPtr<Common::MemoryReadStream> stream(new Common::MemoryReadStream(in.data.get(), in.size));
if (format == kPixelFormatDXT1)
decompressDXT1(out.data.get(), *stream, out.width, out.height, out.width * 4);
else if (format == kPixelFormatDXT3)
decompressDXT3(out.data.get(), *stream, out.width, out.height, out.width * 4);
else if (format == kPixelFormatDXT5)
decompressDXT5(out.data.get(), *stream, out.width, out.height, out.width * 4);
}
void ImageDecoder::decompress(MipMap &out, const MipMap &in, PixelFormatRaw format) {
if ((format != kPixelFormatDXT1) &&
(format != kPixelFormatDXT3) &&
(format != kPixelFormatDXT5))
throw Common::Exception("Unknown compressed format %d", format);
out.width = in.width;
out.height = in.height;
out.size = out.width * out.height * 4;
out.data = new byte[out.size];
Common::MemoryReadStream *stream = new Common::MemoryReadStream(in.data, in.size);
if (format == kPixelFormatDXT1)
decompressDXT1(out.data, *stream, out.width, out.height, out.width * 4);
else if (format == kPixelFormatDXT3)
decompressDXT3(out.data, *stream, out.width, out.height, out.width * 4);
else if (format == kPixelFormatDXT5)
decompressDXT5(out.data, *stream, out.width, out.height, out.width * 4);
delete stream;
}