C++ Compressor::process方法代码示例

//! Compresses data to a DXT format using nVidia's Texture Tools library.
//  The data must be in unsigned byte RGBA format.  The alpha channel will be ignored if DxtType is IL_DXT1.
//  DxtSize is used to return the size in bytes of the DXTC data returned.
ILAPI ILubyte* ILAPIENTRY ilNVidiaCompressDXT(ILubyte *Data, ILuint Width, ILuint Height, ILuint Depth, ILenum DxtFormat, ILuint *DxtSize)
{
	if (Data == NULL) {  // We cannot operate on a null pointer.
		ilSetError(IL_INVALID_PARAM);
		return NULL;
	}

	// The nVidia Texture Tools library does not support volume textures yet.
	if (Depth != 1) {
		ilSetError(IL_INVALID_PARAM);
		return NULL;
	}

	InputOptions inputOptions;
	inputOptions.setTextureLayout(TextureType_2D, Width, Height);
	inputOptions.setMipmapData(Data, Width, Height);
	inputOptions.setMipmapGeneration(false, -1);  //@TODO: Use this in certain cases.

	OutputOptions outputOptions;
	ilOutputHandlerMem outputHandler(Width, Height, DxtFormat);
	outputOptions.setOutputHeader(false);
	outputOptions.setOutputHandler(&outputHandler);

	if (outputHandler.NewData == NULL)
		return NULL;

	CompressionOptions compressionOptions;
	switch (DxtFormat)
	{
		case IL_DXT1:
			compressionOptions.setFormat(Format_DXT1);
			break;
		case IL_DXT1A:
			compressionOptions.setFormat(Format_DXT1a);
			break;
		case IL_DXT3:
			compressionOptions.setFormat(Format_DXT1);
			break;
		case IL_DXT5:
			compressionOptions.setFormat(Format_DXT5);
			break;
		default:  // Does not support DXT2 or DXT4.
			ilSetError(IL_INVALID_PARAM);
			break;
	}

	Compressor compressor;
	compressor.process(inputOptions, compressionOptions, outputOptions);

	*DxtSize = outputHandler.Size;
	return outputHandler.NewData;
}

//! Compresses data to a DXT format using nVidia's Texture Tools library.
//  This version is supposed to be completely internal to DevIL.
//  The data must be in unsigned byte RGBA format.  The alpha channel will be ignored if DxtType is IL_DXT1.
ILuint ilNVidiaCompressDXTFile(ILubyte *Data, ILuint Width, ILuint Height, ILuint Depth, ILenum DxtFormat)
{
	ILuint FilePos = itellw();

	// The nVidia Texture Tools library does not support volume textures yet.
	if (Depth != 1) {
		ilSetError(IL_INVALID_PARAM);
		return 0;
	}

	InputOptions inputOptions;
	inputOptions.setTextureLayout(TextureType_2D, Width, Height);
	inputOptions.setMipmapData(Data, Width, Height);
	inputOptions.setMipmapGeneration(false, -1);  //@TODO: Use this in certain cases.

	OutputOptions outputOptions;
	ilOutputHandlerFile outputHandler(Width, Height, DxtFormat);
	outputOptions.setOutputHeader(false);
	outputOptions.setOutputHandler(&outputHandler);

	CompressionOptions compressionOptions;
	switch (DxtFormat)
	{
		case IL_DXT1:
			compressionOptions.setFormat(Format_DXT1);
			break;
		case IL_DXT1A:
			compressionOptions.setFormat(Format_DXT1a);
			break;
		case IL_DXT3:
			compressionOptions.setFormat(Format_DXT1);
			break;
		case IL_DXT5:
			compressionOptions.setFormat(Format_DXT5);
			break;
		default:  // Does not support DXT2 or DXT4.
			ilSetError(IL_INVALID_PARAM);
			break;
	}

	Compressor compressor;
	compressor.process(inputOptions, compressionOptions, outputOptions);

	return itellw() - FilePos;  // Return the number of characters written.
}

bool LibDxtHelper::WriteDxtFile(const String & fileNameOriginal, int32 width, int32 height, uint8 * data, PixelFormat compressionFormat, bool generateMipmaps)
{
	if(!( (compressionFormat >= FORMAT_DXT1 && compressionFormat <= FORMAT_DXT5NM)|| (compressionFormat == FORMAT_RGBA8888)) )
	{
		Logger::Error("[LibDxtHelper::WriteDxtFile] Wrong copression format (%d).", compressionFormat);
		return false;
	}

	//creating tmp dds file, nvtt accept only filename.dds as input, because of this the last letter befor "." should be changed to "_".
	String extension = FileSystem::Instance()->GetExtension(fileNameOriginal);
    if(0 != CompareCaseInsensitive(extension, ".dds"))
    {
		Logger::Error("[LibDxtHelper::WriteDxtFile] Wrong input file name (%s).", fileNameOriginal.c_str());
        return false;
    }
    

    nvtt::Format innerComprFormat = NvttHelper::GetNVTTFormatByPixelFormat(compressionFormat);
    if(nvtt::Format_BC5 == innerComprFormat)
	{ 	//bc5 is unsupported, used to determinate fail in search
		Logger::Error("[LibDxtHelper::WriteDxtFile] Can't work with nvtt::Format_BC5.");
		return false;
	}
    
	uint32 imgDataSize = width * height * Texture::GetPixelFormatSizeInBytes(FORMAT_RGBA8888);
	NvttHelper::SwapBRChannels(data, imgDataSize);

	InputOptions inputOptions;
	inputOptions.setTextureLayout(TextureType_2D, width, height);
    inputOptions.setMipmapGeneration(generateMipmaps);
    inputOptions.setMipmapData(data, width, height);


	CompressionOptions compressionOptions;
	compressionOptions.setFormat(innerComprFormat);
	if(FORMAT_DXT1NM == compressionFormat)
	{
		compressionOptions.setColorWeights(1, 1, 0);
	}
	else if (FORMAT_DXT5NM == compressionFormat)
	{
		inputOptions.setNormalMap(true);
	}
	
    
	OutputOptions outputOptions;
	String fileName = FileSystem::Instance()->ReplaceExtension(fileNameOriginal, "_dds");
	outputOptions.setFileName(fileName.c_str());
	
	Compressor compressor;
	bool ret = compressor.process(inputOptions, compressionOptions, outputOptions);
    if(ret)
    {
        FileSystem::Instance()->DeleteFile(fileNameOriginal);
        if(!FileSystem::Instance()->MoveFile(fileName, fileNameOriginal, true))
        {
            Logger::Error("[LibDxtHelper::WriteDxtFile] Temporary dds file renamig failed.");
            ret = false;
        }
    }
    else
    {
		Logger::Error("[LibDxtHelper::WriteDxtFile] Error during writing DDS file (%s).", fileName.c_str());
    }
    
	return ret;
}