Method DecodeIFF

Source/Amiga/Graphics_Amiga.cpp:521–663

}

sImage cGraphics_Amiga::DecodeIFF(const std::string& pFilename) {
	sImage			Result;
	auto			File = g_Resource->fileGet(pFilename);
	auto			DataPtr = File->data();

	if (!DataPtr || readBEDWord(DataPtr) != 'FORM')
		return Result;
	DataPtr += 4;
	size_t FileSize = readBEDWord(DataPtr);
	DataPtr += 4;

	if (readBEDWord(DataPtr) != 'ILBM')
		return Result;

	DataPtr += 4;
	FileSize -= 4;

	uint32 Header = 0;
	uint32 Size = 0;

	while (FileSize > 8) {
		Header = readBEDWord(DataPtr);
		DataPtr += 4; FileSize -= 4;
		Size = readBEDWord(DataPtr);
		DataPtr += 4; FileSize -= 4;

		switch (Header) {
		case 'BMHD':
			Result.mDimension.mWidth = readBEWord(DataPtr); DataPtr += 2;
			Result.mDimension.mHeight = readBEWord(DataPtr); DataPtr += 2;
			DataPtr += 2; DataPtr += 2;	// X, Y
			Result.mPlanes = *DataPtr++;
			DataPtr++;	// Mask
			DataPtr++;	// Compression
			DataPtr += 2; ++DataPtr; ++DataPtr; ++DataPtr;
			DataPtr += 2; DataPtr += 2;
			FileSize -= Size;
			break;

		case 'BODY': {
			// + 2 is because the amiga does writing after the end of the image
			Result.mData->resize(Result.mDimension.WidthByHeight() * (Result.mPlanes + 2));

			int16 Width = Result.mDimension.mWidth + 0x0F;
			Width >>= 4;
			Width <<= 1;

			int16 Height = Result.mDimension.mHeight - 1;

			uint8* pDataDest = Result.mData->data();

			for (int16 Y = Height; Y >= 0; --Y) {
				uint8* DataDest = pDataDest;

				for (int8 Plane = 0; Plane < Result.mPlanes; ++Plane) {

					for (int16 X = Width; X > 0;) {
						--FileSize;