nvidia-texture-tools/src/nvtt/CompressDXT.cpp

// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
// 
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

#include "CompressDXT.h"
#include "QuickCompressDXT.h"
#include "OptimalCompressDXT.h"
#include "CompressionOptions.h"
#include "OutputOptions.h"

// squish
#include "squish/colourset.h"
#include "squish/fastclusterfit.h"
#include "squish/weightedclusterfit.h"

#include <nvtt/nvtt.h>

#include <nvcore/Memory.h>

#include <nvimage/Image.h>
#include <nvimage/ColorBlock.h>
#include <nvimage/BlockDXT.h>


// s3_quant
#if defined(HAVE_S3QUANT)
#include "s3tc/s3_quant.h"
#endif

// ati tc
#if defined(HAVE_ATITC)
typedef int BOOL;
typedef _W64 unsigned long ULONG_PTR;
typedef ULONG_PTR DWORD_PTR;
#include "atitc/ATI_Compress.h"
#endif

// squish
#if defined(HAVE_SQUISH)
//#include "squish/squish.h"
#include "squish-1.10/squish.h"
#endif

// d3dx
#if defined(HAVE_D3DX)
#include <d3dx9.h>
#endif

// stb
#if defined(HAVE_STB)
#define STB_DEFINE
#include "stb/stb_dxt.h"
#endif


using namespace nv;
using namespace nvtt;


nv::FastCompressor::FastCompressor() : m_image(NULL), m_alphaMode(AlphaMode_None)
{
}

nv::FastCompressor::~FastCompressor()
{
}

void nv::FastCompressor::setImage(const Image * image, nvtt::AlphaMode alphaMode)
{
	m_image = image;
	m_alphaMode = alphaMode;
}

void nv::FastCompressor::compressDXT1(const OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT1 block;

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			rgba.init(m_image, x, y);
			
			QuickCompress::compressDXT1(rgba, &block);
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::FastCompressor::compressDXT1a(const OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT1 block;

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			rgba.init(m_image, x, y);
			
			QuickCompress::compressDXT1a(rgba, &block);
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::FastCompressor::compressDXT3(const nvtt::OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT3 block;

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			rgba.init(m_image, x, y);

			QuickCompress::compressDXT3(rgba, &block);
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::FastCompressor::compressDXT5(const nvtt::OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT5 block;

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			rgba.init(m_image, x, y);
			
			QuickCompress::compressDXT5(rgba, &block, 0);
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::FastCompressor::compressDXT5n(const nvtt::OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT5 block;

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			rgba.init(m_image, x, y);
			
			rgba.swizzleDXT5n();

			QuickCompress::compressDXT5(rgba, &block, 0);
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


nv::SlowCompressor::SlowCompressor() : m_image(NULL), m_alphaMode(AlphaMode_None)
{
}

nv::SlowCompressor::~SlowCompressor()
{
}

void nv::SlowCompressor::setImage(const Image * image, nvtt::AlphaMode alphaMode)
{
	m_image = image;
	m_alphaMode = alphaMode;
}

void nv::SlowCompressor::compressDXT1(const CompressionOptions::Private & compressionOptions, const OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT1 block;

	nvsquish::WeightedClusterFit fit;
	//nvsquish::ClusterFit fit;
	//nvsquish::FastClusterFit fit;
	fit.SetMetric(compressionOptions.colorWeight.x(), compressionOptions.colorWeight.y(), compressionOptions.colorWeight.z());

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			
			rgba.init(m_image, x, y);
			
			if (rgba.isSingleColor())
			{
				OptimalCompress::compressDXT1(rgba.color(0), &block);
			}
			else
			{
				nvsquish::ColourSet colours((uint8 *)rgba.colors(), 0, true);
				fit.SetColourSet(&colours, nvsquish::kDxt1);
				fit.Compress(&block);
			}
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::SlowCompressor::compressDXT1a(const CompressionOptions::Private & compressionOptions, const OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT1 block;

	nvsquish::WeightedClusterFit fit;
	fit.SetMetric(compressionOptions.colorWeight.x(), compressionOptions.colorWeight.y(), compressionOptions.colorWeight.z());

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			
			rgba.init(m_image, x, y);
			
			bool anyAlpha = false;
			bool allAlpha = true;
			
			for (uint i = 0; i < 16; i++)
			{
				if (rgba.color(i).a < 128) anyAlpha = true;
				else allAlpha = false;
			}
			
			if ((!anyAlpha && rgba.isSingleColor() || allAlpha))
			{
				OptimalCompress::compressDXT1a(rgba.color(0), &block);
			}
			else
			{
				nvsquish::ColourSet colours((uint8 *)rgba.colors(), nvsquish::kDxt1|nvsquish::kWeightColourByAlpha);
				fit.SetColourSet(&colours, nvsquish::kDxt1);
				fit.Compress(&block);
			}
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::SlowCompressor::compressDXT3(const CompressionOptions::Private & compressionOptions, const OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT3 block;
	
	nvsquish::WeightedClusterFit fit;
	fit.SetMetric(compressionOptions.colorWeight.x(), compressionOptions.colorWeight.y(), compressionOptions.colorWeight.z());

	int flags = 0;
	if (m_alphaMode == AlphaMode_Transparency)
	{
		flags = nvsquish::kWeightColourByAlpha;
	}

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			
			rgba.init(m_image, x, y);
			
			// Compress explicit alpha.
			OptimalCompress::compressDXT3A(rgba, &block.alpha);

			// Compress color.
			if (rgba.isSingleColor())
			{
				OptimalCompress::compressDXT1(rgba.color(0), &block.color);
			}
			else
			{
				nvsquish::ColourSet colours((uint8 *)rgba.colors(), flags);
				fit.SetColourSet(&colours, 0);
				fit.Compress(&block.color);
			}
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}

void nv::SlowCompressor::compressDXT5(const CompressionOptions::Private & compressionOptions, const OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT5 block;

	nvsquish::WeightedClusterFit fit;
	fit.SetMetric(compressionOptions.colorWeight.x(), compressionOptions.colorWeight.y(), compressionOptions.colorWeight.z());

	int flags = 0;
	if (m_alphaMode == AlphaMode_Transparency)
	{
		flags = nvsquish::kWeightColourByAlpha;
	}

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			
			rgba.init(m_image, x, y);

			// Compress alpha.
			if (compressionOptions.quality == Quality_Highest)
			{
				OptimalCompress::compressDXT5A(rgba, &block.alpha);
			}
			else
			{
				QuickCompress::compressDXT5A(rgba, &block.alpha);
			}
		
			// Compress color.
			if (rgba.isSingleColor())
			{
				OptimalCompress::compressDXT1(rgba.color(0), &block.color);
			}
			else
			{
				nvsquish::ColourSet colours((uint8 *)rgba.colors(), flags);
				fit.SetColourSet(&colours, 0);
				fit.Compress(&block.color);
			}
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::SlowCompressor::compressDXT5n(const CompressionOptions::Private & compressionOptions, const OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	BlockDXT5 block;
	
	nvsquish::WeightedClusterFit fit;
	fit.SetMetric(0, 1, 0);

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			
			rgba.init(m_image, x, y);
			
			rgba.swizzleDXT5n();			
			
			// Compress X.
			if (compressionOptions.quality == Quality_Highest)
			{
				OptimalCompress::compressDXT5A(rgba, &block.alpha);
			}
			else
			{
				QuickCompress::compressDXT5A(rgba, &block.alpha);
			}
			
			// Compress Y.
			//OptimalCompress::compressDXT1G(rgba, &block.color);

			/*if (rgba.isSingleColor())
			{
				OptimalCompress::compressDXT1G(rgba.color(0), &block.color);
			}
			else*/
			{
				nvsquish::ColourSet colours((uint8 *)rgba.colors(), 0);
				fit.SetColourSet(&colours, 0);
				fit.Compress(&block.color);
			}
			
			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::SlowCompressor::compressBC4(const CompressionOptions::Private & compressionOptions, const nvtt::OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();
	
	ColorBlock rgba;
	AlphaBlockDXT5 block;
	
	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			
			rgba.init(m_image, x, y);

			if (compressionOptions.quality == Quality_Highest)
			{
				OptimalCompress::compressDXT5A(rgba, &block);
			}
			else
			{
				QuickCompress::compressDXT5A(rgba, &block);
			}

			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


void nv::SlowCompressor::compressBC5(const CompressionOptions::Private & compressionOptions, const nvtt::OutputOptions::Private & outputOptions)
{
	const uint w = m_image->width();
	const uint h = m_image->height();

	ColorBlock xcolor;
	ColorBlock ycolor;

	BlockATI2 block;

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			
			xcolor.init(m_image, x, y);
			xcolor.splatX();
			
			ycolor.init(m_image, x, y);
			ycolor.splatY();

			if (compressionOptions.quality == Quality_Highest)
			{
				OptimalCompress::compressDXT5A(xcolor, &block.x);
				OptimalCompress::compressDXT5A(ycolor, &block.y);
			}
			else
			{
				QuickCompress::compressDXT5A(xcolor, &block.x);
				QuickCompress::compressDXT5A(ycolor, &block.y);
			}

			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&block, sizeof(block));
			}
		}
	}
}


#if defined(HAVE_S3QUANT)

void nv::s3CompressDXT1(const Image * image, const OutputOptions::Private & outputOptions)
{
	const uint w = image->width();
	const uint h = image->height();
	
	float error = 0.0f;

	BlockDXT1 dxtBlock3;
	BlockDXT1 dxtBlock4;
	ColorBlock block;

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			block.init(image, x, y);

			// Init rgb block.
			RGBBlock rgbBlock;
			rgbBlock.n = 16;
			for (uint i = 0; i < 16; i++) {
				rgbBlock.colorChannel[i][0] = clamp(float(block.color(i).r) / 255.0f, 0.0f, 1.0f);
				rgbBlock.colorChannel[i][1] = clamp(float(block.color(i).g) / 255.0f, 0.0f, 1.0f);
				rgbBlock.colorChannel[i][2] = clamp(float(block.color(i).b) / 255.0f, 0.0f, 1.0f);
			}
			rgbBlock.weight[0] = 1.0f;
			rgbBlock.weight[1] = 1.0f;
			rgbBlock.weight[2] = 1.0f;

			rgbBlock.inLevel = 4;
			CodeRGBBlock(&rgbBlock);

			// Copy results to DXT block.
			dxtBlock4.col0.r = rgbBlock.endPoint[0][0];
			dxtBlock4.col0.g = rgbBlock.endPoint[0][1];
			dxtBlock4.col0.b = rgbBlock.endPoint[0][2];

			dxtBlock4.col1.r = rgbBlock.endPoint[1][0];
			dxtBlock4.col1.g = rgbBlock.endPoint[1][1];
			dxtBlock4.col1.b = rgbBlock.endPoint[1][2];

			dxtBlock4.setIndices(rgbBlock.index);

			if (dxtBlock4.col0.u < dxtBlock4.col1.u) {
				swap(dxtBlock4.col0.u, dxtBlock4.col1.u);
				dxtBlock4.indices ^= 0x55555555;
			}

			uint error4 = blockError(block, dxtBlock4);

			rgbBlock.inLevel = 3;

			CodeRGBBlock(&rgbBlock);

			// Copy results to DXT block.
			dxtBlock3.col0.r = rgbBlock.endPoint[0][0];
			dxtBlock3.col0.g = rgbBlock.endPoint[0][1];
			dxtBlock3.col0.b = rgbBlock.endPoint[0][2];

			dxtBlock3.col1.r = rgbBlock.endPoint[1][0];
			dxtBlock3.col1.g = rgbBlock.endPoint[1][1];
			dxtBlock3.col1.b = rgbBlock.endPoint[1][2];

			dxtBlock3.setIndices(rgbBlock.index);

			if (dxtBlock3.col0.u > dxtBlock3.col1.u) {
				swap(dxtBlock3.col0.u, dxtBlock3.col1.u);
				dxtBlock3.indices ^= (~dxtBlock3.indices  >> 1) & 0x55555555;
			}

			uint error3 = blockError(block, dxtBlock3);

			if (error3 < error4) {
				error += error3;

				if (outputOptions.outputHandler != NULL) {
					outputOptions.outputHandler->writeData(&dxtBlock3, sizeof(dxtBlock3));
				}
			}
			else {
				error += error4;

				if (outputOptions.outputHandler != NULL) {
					outputOptions.outputHandler->writeData(&dxtBlock4, sizeof(dxtBlock4));
				}
			}
		}
	}
}

#endif // defined(HAVE_S3QUANT)


#if defined(HAVE_ATITC)

void nv::atiCompressDXT1(const Image * image, const OutputOptions::Private & outputOptions)
{
	// Init source texture
	ATI_TC_Texture srcTexture;
	srcTexture.dwSize = sizeof(srcTexture);
	srcTexture.dwWidth = image->width();
	srcTexture.dwHeight = image->height();
	srcTexture.dwPitch = image->width() * 4;
	srcTexture.format = ATI_TC_FORMAT_ARGB_8888;
	srcTexture.dwDataSize = ATI_TC_CalculateBufferSize(&srcTexture);
	srcTexture.pData = (ATI_TC_BYTE*) image->pixels();

	// Init dest texture
	ATI_TC_Texture destTexture;
	destTexture.dwSize = sizeof(destTexture);
	destTexture.dwWidth = image->width();
	destTexture.dwHeight = image->height();
	destTexture.dwPitch = 0;
	destTexture.format = ATI_TC_FORMAT_DXT1;
	destTexture.dwDataSize = ATI_TC_CalculateBufferSize(&destTexture);
	destTexture.pData = (ATI_TC_BYTE*) mem::malloc(destTexture.dwDataSize);

	// Compress
	ATI_TC_ConvertTexture(&srcTexture, &destTexture, NULL, NULL, NULL, NULL);

	if (outputOptions.outputHandler != NULL) {
		outputOptions.outputHandler->writeData(destTexture.pData, destTexture.dwDataSize);
	}

	mem::free(destTexture.pData);
}

void nv::atiCompressDXT5(const Image * image, const OutputOptions::Private & outputOptions)
{
	// Init source texture
	ATI_TC_Texture srcTexture;
	srcTexture.dwSize = sizeof(srcTexture);
	srcTexture.dwWidth = image->width();
	srcTexture.dwHeight = image->height();
	srcTexture.dwPitch = image->width() * 4;
	srcTexture.format = ATI_TC_FORMAT_ARGB_8888;
	srcTexture.dwDataSize = ATI_TC_CalculateBufferSize(&srcTexture);
	srcTexture.pData = (ATI_TC_BYTE*) image->pixels();

	// Init dest texture
	ATI_TC_Texture destTexture;
	destTexture.dwSize = sizeof(destTexture);
	destTexture.dwWidth = image->width();
	destTexture.dwHeight = image->height();
	destTexture.dwPitch = 0;
	destTexture.format = ATI_TC_FORMAT_DXT5;
	destTexture.dwDataSize = ATI_TC_CalculateBufferSize(&destTexture);
	destTexture.pData = (ATI_TC_BYTE*) mem::malloc(destTexture.dwDataSize);

	// Compress
	ATI_TC_ConvertTexture(&srcTexture, &destTexture, NULL, NULL, NULL, NULL);

	if (outputOptions.outputHandler != NULL) {
		outputOptions.outputHandler->writeData(destTexture.pData, destTexture.dwDataSize);
	}

	mem::free(destTexture.pData);
}

#endif // defined(HAVE_ATITC)

#if defined(HAVE_SQUISH)

void nv::squishCompressDXT1(const Image * image, const OutputOptions::Private & outputOptions)
{
	Image img(*image);
	int count = img.width() * img.height();
	for (int i = 0; i < count; i++)
	{
		Color32 c = img.pixel(i);
		img.pixel(i) = Color32(c.b, c.g, c.r, c.a);
	}

	int size = squish::GetStorageRequirements(img.width(), img.height(), squish::kDxt1);
	void * blocks = mem::malloc(size);

	squish::CompressImage((const squish::u8 *)img.pixels(), img.width(), img.height(), blocks, squish::kDxt1 | squish::kColourClusterFit);

	if (outputOptions.outputHandler != NULL) {
		outputOptions.outputHandler->writeData(blocks, size);
	}

	mem::free(blocks);
}

#endif // defined(HAVE_SQUISH)


#if defined(HAVE_D3DX)

void nv::d3dxCompressDXT1(const Image * image, const OutputOptions::Private & outputOptions)
{
	IDirect3D9 * d3d = Direct3DCreate9(D3D_SDK_VERSION);

	D3DPRESENT_PARAMETERS presentParams;
	ZeroMemory(&presentParams, sizeof(presentParams));
	presentParams.Windowed = TRUE;
	presentParams.SwapEffect = D3DSWAPEFFECT_COPY;
	presentParams.BackBufferWidth = 8;
	presentParams.BackBufferHeight = 8;
	presentParams.BackBufferFormat = D3DFMT_UNKNOWN;

	HRESULT err;

	IDirect3DDevice9 * device = NULL;
	err = d3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_REF, GetDesktopWindow(), D3DCREATE_SOFTWARE_VERTEXPROCESSING, &presentParams, &device);

	IDirect3DTexture9 * texture = NULL;
	err = D3DXCreateTexture(device, image->width(), image->height(), 1, 0, D3DFMT_DXT1, D3DPOOL_SYSTEMMEM, &texture);
	
	IDirect3DSurface9 * surface = NULL;
	err = texture->GetSurfaceLevel(0, &surface);

	RECT rect;
	rect.left = 0; 
	rect.top = 0; 
	rect.bottom = image->height();
	rect.right = image->width();

	err = D3DXLoadSurfaceFromMemory(surface, NULL, NULL, image->pixels(), D3DFMT_A8R8G8B8, image->width() * sizeof(Color32), NULL, &rect, D3DX_DEFAULT, 0);

	if (err != D3DERR_INVALIDCALL && err != D3DXERR_INVALIDDATA)
	{
		D3DLOCKED_RECT rect;
		ZeroMemory(&rect, sizeof(rect));

		err = surface->LockRect(&rect, NULL, D3DLOCK_READONLY);

		if (outputOptions.outputHandler != NULL) {
			int size = rect.Pitch * ((image->height() + 3) / 4);
			outputOptions.outputHandler->writeData(rect.pBits, size);
		}

		err = surface->UnlockRect();
	}

	surface->Release();
	device->Release();
	d3d->Release();
}

#endif // defined(HAVE_D3DX)


#if defined(HAVE_STB)

void nv::stbCompressDXT1(const Image * image, const OutputOptions::Private & outputOptions)
{
	const uint w = image->width();
	const uint h = image->height();
	
	float error = 0.0f;

	BlockDXT1 dxtBlock;
	ColorBlock block;

	for (uint y = 0; y < h; y += 4) {
		for (uint x = 0; x < w; x += 4) {
			block.init(image, x, y);
			block.swizzleSTB();

			stb_compress_dxt_block((unsigned char *)&dxtBlock, (unsigned char *)block.colors(), 0, 0);

			if (outputOptions.outputHandler != NULL) {
				outputOptions.outputHandler->writeData(&dxtBlock, sizeof(dxtBlock));
			}
		}
	}
}

#endif // defined(HAVE_STB)