This commit is a modified version of patch #6860

It adds read only dds support.  (Writing will come later)

Kent

1 files changed, 828 insertions, 0 deletions

diff --git a/source/blender/imbuf/intern/dds/DirectDrawSurface.cpp b/source/blender/imbuf/intern/dds/DirectDrawSurface.cpp
new file mode 100644
index 00000000000..6937840334d
--- /dev/null
+++ b/source/blender/imbuf/intern/dds/DirectDrawSurface.cpp
@@ -0,0 +1,828 @@
+/**
+ * $Id$
+ *
+ * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * Contributors: Amorilia (amorilia@gamebox.net)
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ */
+
+/*
+ * This file is based on a similar file from the NVIDIA texture tools
+ * (http://nvidia-texture-tools.googlecode.com/)
+ *
+ * Original license from NVIDIA follows.
+ */
+
+// 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 <Common.h>
+#include <DirectDrawSurface.h>
+#include <BlockDXT.h>
+
+#include <stdio.h> // printf
+#include <math.h>  // sqrt
+
+/*** declarations ***/
+
+#if !defined(MAKEFOURCC)
+#	define MAKEFOURCC(ch0, ch1, ch2, ch3) \
+		((unsigned int)((unsigned char)(ch0)) | \
+		((unsigned int)((unsigned char)(ch1)) << 8) | \
+		((unsigned int)((unsigned char)(ch2)) << 16) | \
+		((unsigned int)((unsigned char)(ch3)) << 24 ))
+#endif
+
+static const unsigned int FOURCC_DDS = MAKEFOURCC('D', 'D', 'S', ' ');
+static const unsigned int FOURCC_DXT1 = MAKEFOURCC('D', 'X', 'T', '1');
+static const unsigned int FOURCC_DXT2 = MAKEFOURCC('D', 'X', 'T', '2');
+static const unsigned int FOURCC_DXT3 = MAKEFOURCC('D', 'X', 'T', '3');
+static const unsigned int FOURCC_DXT4 = MAKEFOURCC('D', 'X', 'T', '4');
+static const unsigned int FOURCC_DXT5 = MAKEFOURCC('D', 'X', 'T', '5');
+static const unsigned int FOURCC_RXGB = MAKEFOURCC('R', 'X', 'G', 'B');
+static const unsigned int FOURCC_ATI1 = MAKEFOURCC('A', 'T', 'I', '1');
+static const unsigned int FOURCC_ATI2 = MAKEFOURCC('A', 'T', 'I', '2');
+
+// RGB formats.
+static const unsigned int D3DFMT_R8G8B8 = 20;
+static const unsigned int D3DFMT_A8R8G8B8 = 21;
+static const unsigned int D3DFMT_X8R8G8B8 = 22;
+static const unsigned int D3DFMT_R5G6B5 = 23;
+static const unsigned int D3DFMT_X1R5G5B5 = 24;
+static const unsigned int D3DFMT_A1R5G5B5 = 25;
+static const unsigned int D3DFMT_A4R4G4B4 = 26;
+static const unsigned int D3DFMT_R3G3B2 = 27;
+static const unsigned int D3DFMT_A8 = 28;
+static const unsigned int D3DFMT_A8R3G3B2 = 29;
+static const unsigned int D3DFMT_X4R4G4B4 = 30;
+static const unsigned int D3DFMT_A2B10G10R10 = 31;
+static const unsigned int D3DFMT_A8B8G8R8 = 32;
+static const unsigned int D3DFMT_X8B8G8R8 = 33;
+static const unsigned int D3DFMT_G16R16 = 34;
+static const unsigned int D3DFMT_A2R10G10B10 = 35;
+static const unsigned int D3DFMT_A16B16G16R16 = 36;
+
+// Palette formats.
+static const unsigned int D3DFMT_A8P8 = 40;
+static const unsigned int D3DFMT_P8 = 41;
+	
+// Luminance formats.
+static const unsigned int D3DFMT_L8 = 50;
+static const unsigned int D3DFMT_A8L8 = 51;
+static const unsigned int D3DFMT_A4L4 = 52;
+
+// Floating point formats
+static const unsigned int D3DFMT_R16F = 111;
+static const unsigned int D3DFMT_G16R16F = 112;
+static const unsigned int D3DFMT_A16B16G16R16F = 113;
+static const unsigned int D3DFMT_R32F = 114;
+static const unsigned int D3DFMT_G32R32F = 115;
+static const unsigned int D3DFMT_A32B32G32R32F = 116;
+	
+static const unsigned int DDSD_CAPS = 0x00000001U;
+static const unsigned int DDSD_PIXELFORMAT = 0x00001000U;
+static const unsigned int DDSD_WIDTH = 0x00000004U;
+static const unsigned int DDSD_HEIGHT = 0x00000002U;
+static const unsigned int DDSD_PITCH = 0x00000008U;
+static const unsigned int DDSD_MIPMAPCOUNT = 0x00020000U;
+static const unsigned int DDSD_LINEARSIZE = 0x00080000U;
+static const unsigned int DDSD_DEPTH = 0x00800000U;
+	
+static const unsigned int DDSCAPS_COMPLEX = 0x00000008U;
+static const unsigned int DDSCAPS_TEXTURE = 0x00001000U;
+static const unsigned int DDSCAPS_MIPMAP = 0x00400000U;
+static const unsigned int DDSCAPS2_VOLUME = 0x00200000U;
+static const unsigned int DDSCAPS2_CUBEMAP = 0x00000200U;
+
+static const unsigned int DDSCAPS2_CUBEMAP_POSITIVEX = 0x00000400U;
+static const unsigned int DDSCAPS2_CUBEMAP_NEGATIVEX = 0x00000800U;
+static const unsigned int DDSCAPS2_CUBEMAP_POSITIVEY = 0x00001000U;
+static const unsigned int DDSCAPS2_CUBEMAP_NEGATIVEY = 0x00002000U;
+static const unsigned int DDSCAPS2_CUBEMAP_POSITIVEZ = 0x00004000U;
+static const unsigned int DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x00008000U;
+static const unsigned int DDSCAPS2_CUBEMAP_ALL_FACES = 0x0000FC00U;
+
+static const unsigned int DDPF_ALPHAPIXELS = 0x00000001U;
+static const unsigned int DDPF_ALPHA = 0x00000002U;
+static const unsigned int DDPF_FOURCC = 0x00000004U;
+static const unsigned int DDPF_RGB = 0x00000040U;
+static const unsigned int DDPF_PALETTEINDEXED1 = 0x00000800U;
+static const unsigned int DDPF_PALETTEINDEXED2 = 0x00001000U;
+static const unsigned int DDPF_PALETTEINDEXED4 = 0x00000008U;
+static const unsigned int DDPF_PALETTEINDEXED8 = 0x00000020U;
+static const unsigned int DDPF_LUMINANCE = 0x00020000U;
+static const unsigned int DDPF_ALPHAPREMULT = 0x00008000U;
+static const unsigned int DDPF_NORMAL = 0x80000000U;	// @@ Custom nv flag.
+
+/*** implementation ***/
+
+void mem_read(Stream & mem, DDSPixelFormat & pf)
+{
+	mem_read(mem, pf.size);
+	mem_read(mem, pf.flags);
+	mem_read(mem, pf.fourcc);
+	mem_read(mem, pf.bitcount);
+	mem_read(mem, pf.rmask);
+	mem_read(mem, pf.gmask);
+	mem_read(mem, pf.bmask);
+	mem_read(mem, pf.amask);
+}
+
+void mem_read(Stream & mem, DDSCaps & caps)
+{
+	mem_read(mem, caps.caps1);
+	mem_read(mem, caps.caps2);
+	mem_read(mem, caps.caps3);
+	mem_read(mem, caps.caps4);
+}
+
+void mem_read(Stream & mem, DDSHeader & header)
+{
+	mem_read(mem, header.fourcc);
+	mem_read(mem, header.size);
+	mem_read(mem, header.flags);
+	mem_read(mem, header.height);
+	mem_read(mem, header.width);
+	mem_read(mem, header.pitch);
+	mem_read(mem, header.depth);
+	mem_read(mem, header.mipmapcount);
+	for (unsigned int i = 0; i < 11; i++) mem_read(mem, header.reserved[i]);
+	mem_read(mem, header.pf);
+	mem_read(mem, header.caps);
+	mem_read(mem, header.notused);
+}
+
+DDSHeader::DDSHeader()
+{
+	this->fourcc = FOURCC_DDS;
+	this->size = 124;
+	this->flags  = (DDSD_CAPS|DDSD_PIXELFORMAT);
+	this->height = 0;
+	this->width = 0;
+	this->pitch = 0;
+	this->depth = 0;
+	this->mipmapcount = 0;
+	for (unsigned int i = 0; i < 11; i++) this->reserved[i] = 0;
+
+	// Store version information on the reserved header attributes.
+	this->reserved[9] = MAKEFOURCC('N', 'V', 'T', 'T');
+	this->reserved[10] = (0 << 16) | (9 << 8) | (3);	// major.minor.revision
+
+	this->pf.size = 32;
+	this->pf.flags = 0;
+	this->pf.fourcc = 0;
+	this->pf.bitcount = 0;
+	this->pf.rmask = 0;
+	this->pf.gmask = 0;
+	this->pf.bmask = 0;
+	this->pf.amask = 0;
+	this->caps.caps1 = DDSCAPS_TEXTURE;
+	this->caps.caps2 = 0;
+	this->caps.caps3 = 0;
+	this->caps.caps4 = 0;
+	this->notused = 0;
+}
+
+void DDSHeader::setWidth(unsigned int w)
+{
+	this->flags |= DDSD_WIDTH;
+	this->width = w;
+}
+
+void DDSHeader::setHeight(unsigned int h)
+{
+	this->flags |= DDSD_HEIGHT;
+	this->height = h;
+}
+
+void DDSHeader::setDepth(unsigned int d)
+{
+	this->flags |= DDSD_DEPTH;
+	this->height = d;
+}
+
+void DDSHeader::setMipmapCount(unsigned int count)
+{
+	if (count == 0)
+	{
+		this->flags &= ~DDSD_MIPMAPCOUNT;
+		this->mipmapcount = 0;
+
+		if (this->caps.caps2 == 0) {
+			this->caps.caps1 = DDSCAPS_TEXTURE;
+		}
+		else {
+			this->caps.caps1 = DDSCAPS_TEXTURE | DDSCAPS_COMPLEX;
+		}
+	}
+	else
+	{
+		this->flags |= DDSD_MIPMAPCOUNT;
+		this->mipmapcount = count;
+
+		this->caps.caps1 |= DDSCAPS_COMPLEX | DDSCAPS_MIPMAP;
+	}
+}
+
+void DDSHeader::setTexture2D()
+{
+	// nothing to do here.
+}
+
+void DDSHeader::setTexture3D()
+{
+	this->caps.caps2 = DDSCAPS2_VOLUME;
+}
+
+void DDSHeader::setTextureCube()
+{
+	this->caps.caps1 |= DDSCAPS_COMPLEX;
+	this->caps.caps2 = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_ALL_FACES;
+}
+
+void DDSHeader::setLinearSize(unsigned int size)
+{
+	this->flags &= ~DDSD_PITCH;
+	this->flags |= DDSD_LINEARSIZE;
+	this->pitch = size;
+}
+
+void DDSHeader::setPitch(unsigned int pitch)
+{
+	this->flags &= ~DDSD_LINEARSIZE;
+	this->flags |= DDSD_PITCH;
+	this->pitch = pitch;
+}
+
+void DDSHeader::setFourCC(unsigned char c0, unsigned char c1, unsigned char c2, unsigned char c3)
+{
+	// set fourcc pixel format.
+	this->pf.flags = DDPF_FOURCC;
+	this->pf.fourcc = MAKEFOURCC(c0, c1, c2, c3);
+	this->pf.bitcount = 0;
+	this->pf.rmask = 0;
+	this->pf.gmask = 0;
+	this->pf.bmask = 0;
+	this->pf.amask = 0;
+}
+
+void DDSHeader::setPixelFormat(unsigned int bitcount, unsigned int rmask, unsigned int gmask, unsigned int bmask, unsigned int amask)
+{
+	// Make sure the masks are correct.
+	if ((rmask & gmask) || \
+		(rmask & bmask) || \
+		(rmask & amask) || \
+		(gmask & bmask) || \
+		(gmask & amask) || \
+		(bmask & amask)) {
+		printf("DDS: bad RGBA masks, pixel format not set\n");
+		return;
+	}
+
+	this->pf.flags = DDPF_RGB;
+
+	if (amask != 0) {
+		this->pf.flags |= DDPF_ALPHAPIXELS;
+	}
+
+	if (bitcount == 0)
+	{
+		// Compute bit count from the masks.
+		unsigned int total = rmask | gmask | bmask | amask;
+		while(total != 0) {
+			bitcount++;
+			total >>= 1;
+		}
+		// @@ Align to 8?
+	}
+
+	this->pf.fourcc = 0;
+	this->pf.bitcount = bitcount;
+	this->pf.rmask = rmask;
+	this->pf.gmask = gmask;
+	this->pf.bmask = bmask;
+	this->pf.amask = amask;
+}
+
+void DDSHeader::setNormalFlag(bool b)
+{
+	if (b) this->pf.flags |= DDPF_NORMAL;
+	else this->pf.flags &= ~DDPF_NORMAL;
+}
+
+/*
+void DDSHeader::swapBytes()
+{
+	this->fourcc = POSH_LittleU32(this->fourcc);
+	this->size = POSH_LittleU32(this->size);
+	this->flags = POSH_LittleU32(this->flags);
+	this->height = POSH_LittleU32(this->height);
+	this->width = POSH_LittleU32(this->width);
+	this->pitch = POSH_LittleU32(this->pitch);
+	this->depth = POSH_LittleU32(this->depth);
+	this->mipmapcount = POSH_LittleU32(this->mipmapcount);
+	
+	for(int i = 0; i < 11; i++) {
+		this->reserved[i] = POSH_LittleU32(this->reserved[i]);
+	}
+
+	this->pf.size = POSH_LittleU32(this->pf.size);
+	this->pf.flags = POSH_LittleU32(this->pf.flags);
+	this->pf.fourcc = POSH_LittleU32(this->pf.fourcc);
+	this->pf.bitcount = POSH_LittleU32(this->pf.bitcount);
+	this->pf.rmask = POSH_LittleU32(this->pf.rmask);
+	this->pf.gmask = POSH_LittleU32(this->pf.gmask);
+	this->pf.bmask = POSH_LittleU32(this->pf.bmask);
+	this->pf.amask = POSH_LittleU32(this->pf.amask);
+	this->caps.caps1 = POSH_LittleU32(this->caps.caps1);
+	this->caps.caps2 = POSH_LittleU32(this->caps.caps2);
+	this->caps.caps3 = POSH_LittleU32(this->caps.caps3);
+	this->caps.caps4 = POSH_LittleU32(this->caps.caps4);
+	this->notused = POSH_LittleU32(this->notused);
+}
+*/
+
+
+DirectDrawSurface::DirectDrawSurface(unsigned char *mem, unsigned int size) : stream(mem, size), header()
+{
+	mem_read(stream, header);
+}
+
+DirectDrawSurface::~DirectDrawSurface()
+{
+}
+
+bool DirectDrawSurface::isValid() const
+{
+	if (header.fourcc != FOURCC_DDS || header.size != 124)
+	{
+		return false;
+	}
+	
+	const unsigned int required = (DDSD_WIDTH|DDSD_HEIGHT|DDSD_CAPS|DDSD_PIXELFORMAT);
+	if( (header.flags & required) != required ) {
+		return false;
+	}
+	
+	if (header.pf.size != 32) {
+		return false;
+	}
+
+	/* in some files DDSCAPS_TEXTURE is missing: silently ignore */
+	/*
+	if( !(header.caps.caps1 & DDSCAPS_TEXTURE) ) {
+		return false;
+	}
+	*/
+
+	return true;
+}
+
+bool DirectDrawSurface::isSupported() const
+{
+	if (header.pf.flags & DDPF_FOURCC)
+	{
+		if (header.pf.fourcc != FOURCC_DXT1 &&
+		    header.pf.fourcc != FOURCC_DXT2 &&
+		    header.pf.fourcc != FOURCC_DXT3 &&
+		    header.pf.fourcc != FOURCC_DXT4 &&
+		    header.pf.fourcc != FOURCC_DXT5 &&
+		    header.pf.fourcc != FOURCC_RXGB &&
+		    header.pf.fourcc != FOURCC_ATI1 &&
+		    header.pf.fourcc != FOURCC_ATI2)
+		{
+			// Unknown fourcc code.
+			return false;
+		}
+	}
+	/*
+	else if (header.pf.flags & DDPF_RGB)
+	{
+		if (header.pf.bitcount == 24)
+		{
+			return false;
+		}
+		else if (header.pf.bitcount == 32)
+		{
+			return false;
+		}
+		else
+		{
+			// Unsupported pixel format.
+			return false;
+		}
+	}
+	*/
+	else
+	{
+		return false;
+	}
+	
+	if (isTextureCube() && (header.caps.caps2 & DDSCAPS2_CUBEMAP_ALL_FACES) != DDSCAPS2_CUBEMAP_ALL_FACES)
+	{
+		// Cubemaps must contain all faces.
+		return false;
+	}
+	
+	if (isTexture3D())
+	{
+		// @@ 3D textures not supported yet.
+		return false;
+	}
+	
+	return true;
+}
+
+
+unsigned int DirectDrawSurface::mipmapCount() const
+{
+	if (header.flags & DDSD_MIPMAPCOUNT) return header.mipmapcount;
+	else return 0;
+}
+
+
+unsigned int DirectDrawSurface::width() const
+{
+	if (header.flags & DDSD_WIDTH) return header.width;
+	else return 1;
+}
+
+unsigned int DirectDrawSurface::height() const
+{
+	if (header.flags & DDSD_HEIGHT) return header.height;
+	else return 1;
+}
+
+unsigned int DirectDrawSurface::depth() const
+{
+	if (header.flags & DDSD_DEPTH) return header.depth;
+	else return 1;
+}
+
+bool DirectDrawSurface::hasAlpha() const
+{
+	if (header.pf.fourcc == FOURCC_DXT1) return false;
+	else return true;
+}
+
+bool DirectDrawSurface::isTexture2D() const
+{
+	return !isTexture3D() && !isTextureCube();
+}
+
+bool DirectDrawSurface::isTexture3D() const
+{
+	return (header.caps.caps2 & DDSCAPS2_VOLUME) != 0;
+}
+
+bool DirectDrawSurface::isTextureCube() const
+{
+	return (header.caps.caps2 & DDSCAPS2_CUBEMAP) != 0;
+}
+
+void DirectDrawSurface::mipmap(Image * img, unsigned int face, unsigned int mipmap)
+{
+	stream.seek(offset(face, mipmap));
+	
+	unsigned int w = width();
+	unsigned int h = height();
+	
+	// Compute width and height.
+	for (unsigned int m = 0; m < mipmap; m++)
+	{
+		w = max(w/2, 1U);
+		h = max(h/2, 1U);
+	}
+	
+	img->allocate(w, h);
+	
+	if (header.pf.flags & DDPF_RGB) 
+	{
+		readLinearImage(img);
+	}
+	else if (header.pf.flags & DDPF_FOURCC)
+	{
+		readBlockImage(img);
+	}
+}
+
+void DirectDrawSurface::readLinearImage(Image * img)
+{
+	// @@ Read linear RGB images.
+	printf("DDS: linear RGB images not supported\n");
+}
+
+void DirectDrawSurface::readBlockImage(Image * img)
+{
+	const unsigned int w = img->width();
+	const unsigned int h = img->height();
+	
+	const unsigned int bw = (w + 3) / 4;
+	const unsigned int bh = (h + 3) / 4;
+	
+	for (unsigned int by = 0; by < bh; by++)
+	{
+		for (unsigned int bx = 0; bx < bw; bx++)
+		{
+			ColorBlock block;
+			
+			// Read color block.
+			readBlock(&block);
+			
+			// Write color block.
+			for (unsigned int y = 0; y < min(4U, h-4*by); y++)
+			{
+				for (unsigned int x = 0; x < min(4U, w-4*bx); x++)
+				{
+					img->pixel(4*bx+x, 4*by+y) = block.color(x, y);
+				}
+			}
+		}
+	}
+}
+
+static Color32 buildNormal(unsigned char x, unsigned char y)
+{
+	float nx = 2 * (x / 255) - 1;
+	float ny = 2 * (x / 255) - 1;
+	float nz = sqrt(1 - nx*nx - ny*ny);
+	unsigned char z = clamp(int(255 * (nz + 1) / 2), 0, 255);
+	
+	return Color32(x, y, z);
+}
+
+
+void DirectDrawSurface::readBlock(ColorBlock * rgba)
+{
+	if (header.pf.fourcc == FOURCC_DXT1)
+	{
+		BlockDXT1 block;
+		mem_read(stream, block);
+		block.decodeBlock(rgba);
+	}
+	else if (header.pf.fourcc == FOURCC_DXT2 ||
+	    header.pf.fourcc == FOURCC_DXT3)
+	{
+		BlockDXT3 block;
+		mem_read(stream, block);
+		block.decodeBlock(rgba);
+	}
+	else if (header.pf.fourcc == FOURCC_DXT4 ||
+	    header.pf.fourcc == FOURCC_DXT5 ||
+	    header.pf.fourcc == FOURCC_RXGB)
+	{
+		BlockDXT5 block;
+		mem_read(stream, block);
+		block.decodeBlock(rgba);
+		
+		if (header.pf.fourcc == FOURCC_RXGB)
+		{
+			// Swap R & A.
+			for (int i = 0; i < 16; i++)
+			{
+				Color32 & c = rgba->color(i);
+				unsigned int tmp = c.r;
+				c.r = c.a;
+				c.a = tmp;
+			}
+		}
+	}
+	else if (header.pf.fourcc == FOURCC_ATI1)
+	{
+		BlockATI1 block;
+		mem_read(stream, block);
+		block.decodeBlock(rgba);
+	}
+	else if (header.pf.fourcc == FOURCC_ATI2)
+	{
+		BlockATI2 block;
+		mem_read(stream, block);
+		block.decodeBlock(rgba);
+	}
+	
+	// If normal flag set, convert to normal.
+	if (header.pf.flags & DDPF_NORMAL)
+	{
+		if (header.pf.fourcc == FOURCC_ATI2)
+		{
+			for (int i = 0; i < 16; i++)
+			{
+				Color32 & c = rgba->color(i);
+				c = buildNormal(c.r, c.g);
+			}
+		}
+		else if (header.pf.fourcc == FOURCC_DXT5)
+		{
+			for (int i = 0; i < 16; i++)
+			{
+				Color32 & c = rgba->color(i);
+				c = buildNormal(c.g, c.a);
+			}
+		}
+	}
+}
+
+
+unsigned int DirectDrawSurface::blockSize() const
+{
+	switch(header.pf.fourcc)
+	{
+		case FOURCC_DXT1:
+		case FOURCC_ATI1:
+			return 8;
+		case FOURCC_DXT2:
+		case FOURCC_DXT3:
+		case FOURCC_DXT4:
+		case FOURCC_DXT5:
+		case FOURCC_RXGB:
+		case FOURCC_ATI2:
+			return 16;
+	};
+
+	// Not a block image.
+	return 0;
+}
+
+unsigned int DirectDrawSurface::mipmapSize(unsigned int mipmap) const
+{
+	unsigned int w = width();
+	unsigned int h = height();
+	unsigned int d = depth();
+	
+	for (unsigned int m = 0; m < mipmap; m++)
+	{
+		w = max(1U, w / 2);
+		h = max(1U, h / 2);
+		d = max(1U, d / 2);
+	}
+
+	if (header.pf.flags & DDPF_FOURCC)
+	{
+		// @@ How are 3D textures aligned?
+		w = (w + 3) / 4;
+		h = (h + 3) / 4;
+		return blockSize() * w * h;
+	}
+	else if (header.pf.flags & DDPF_RGB)
+	{
+		// Align pixels to bytes.
+		unsigned int byteCount = (header.pf.bitcount + 7) / 8;
+		
+		// Align pitch to 4 bytes.
+		unsigned int pitch = 4 * ((w * byteCount + 3) / 4);
+		
+		return pitch * h * d;
+	}
+	else {
+		printf("DDS: mipmap format not supported\n");
+		return(0);
+	};
+}
+
+unsigned int DirectDrawSurface::faceSize() const
+{
+	const unsigned int count = mipmapCount();
+	unsigned int size = 0;
+	
+	for (unsigned int m = 0; m < count; m++)
+	{
+		size += mipmapSize(m);
+	}
+	
+	return size;
+}
+
+unsigned int DirectDrawSurface::offset(const unsigned int face, const unsigned int mipmap)
+{
+	unsigned int size = sizeof(DDSHeader);
+	
+	if (face != 0)
+	{
+		size += face * faceSize();
+	}
+	
+	for (unsigned int m = 0; m < mipmap; m++)
+	{
+		size += mipmapSize(m);
+	}
+	
+	return size;
+}
+
+
+void DirectDrawSurface::printInfo() const
+{
+	/* printf("FOURCC: %c%c%c%c\n", ((unsigned char *)&header.fourcc)[0], ((unsigned char *)&header.fourcc)[1], ((unsigned char *)&header.fourcc)[2], ((unsigned char *)&header.fourcc)[3]); */
+	printf("Flags: 0x%.8X\n", header.flags);
+	if (header.flags & DDSD_CAPS) printf("\tDDSD_CAPS\n");
+	if (header.flags & DDSD_PIXELFORMAT) printf("\tDDSD_PIXELFORMAT\n");
+	if (header.flags & DDSD_WIDTH) printf("\tDDSD_WIDTH\n");
+	if (header.flags & DDSD_HEIGHT) printf("\tDDSD_HEIGHT\n");
+	if (header.flags & DDSD_DEPTH) printf("\tDDSD_DEPTH\n");
+	if (header.flags & DDSD_PITCH) printf("\tDDSD_PITCH\n");
+	if (header.flags & DDSD_LINEARSIZE) printf("\tDDSD_LINEARSIZE\n");
+	if (header.flags & DDSD_MIPMAPCOUNT) printf("\tDDSD_MIPMAPCOUNT\n");
+
+	printf("Height: %d\n", header.height);
+	printf("Width: %d\n", header.width);
+	printf("Depth: %d\n", header.depth);
+	if (header.flags & DDSD_PITCH) printf("Pitch: %d\n", header.pitch);
+	else if (header.flags & DDSD_LINEARSIZE) printf("Linear size: %d\n", header.pitch);
+	printf("Mipmap count: %d\n", header.mipmapcount);
+	
+	printf("Pixel Format:\n");
+	/* printf("\tSize: %d\n", header.pf.size); */
+	printf("\tFlags: 0x%.8X\n", header.pf.flags);
+	if (header.pf.flags & DDPF_RGB) printf("\t\tDDPF_RGB\n");
+	if (header.pf.flags & DDPF_FOURCC) printf("\t\tDDPF_FOURCC\n");
+	if (header.pf.flags & DDPF_ALPHAPIXELS) printf("\t\tDDPF_ALPHAPIXELS\n");
+	if (header.pf.flags & DDPF_ALPHA) printf("\t\tDDPF_ALPHA\n");
+	if (header.pf.flags & DDPF_PALETTEINDEXED1) printf("\t\tDDPF_PALETTEINDEXED1\n");
+	if (header.pf.flags & DDPF_PALETTEINDEXED2) printf("\t\tDDPF_PALETTEINDEXED2\n");
+	if (header.pf.flags & DDPF_PALETTEINDEXED4) printf("\t\tDDPF_PALETTEINDEXED4\n");
+	if (header.pf.flags & DDPF_PALETTEINDEXED8) printf("\t\tDDPF_PALETTEINDEXED8\n");
+	if (header.pf.flags & DDPF_ALPHAPREMULT) printf("\t\tDDPF_ALPHAPREMULT\n");
+	if (header.pf.flags & DDPF_NORMAL) printf("\t\tDDPF_NORMAL\n");
+	
+	printf("\tFourCC: '%c%c%c%c'\n", ((header.pf.fourcc >> 0) & 0xFF), ((header.pf.fourcc >> 8) & 0xFF), ((header.pf.fourcc >> 16) & 0xFF), ((header.pf.fourcc >> 24) & 0xFF));
+	printf("\tBit count: %d\n", header.pf.bitcount);
+	printf("\tRed mask: 0x%.8X\n", header.pf.rmask);
+	printf("\tGreen mask: 0x%.8X\n", header.pf.gmask);
+	printf("\tBlue mask: 0x%.8X\n", header.pf.bmask);
+	printf("\tAlpha mask: 0x%.8X\n", header.pf.amask);
+
+	printf("Caps:\n");
+	printf("\tCaps 1: 0x%.8X\n", header.caps.caps1);
+	if (header.caps.caps1 & DDSCAPS_COMPLEX) printf("\t\tDDSCAPS_COMPLEX\n");
+	if (header.caps.caps1 & DDSCAPS_TEXTURE) printf("\t\tDDSCAPS_TEXTURE\n");
+	if (header.caps.caps1 & DDSCAPS_MIPMAP) printf("\t\tDDSCAPS_MIPMAP\n");
+
+	printf("\tCaps 2: 0x%.8X\n", header.caps.caps2);
+	if (header.caps.caps2 & DDSCAPS2_VOLUME) printf("\t\tDDSCAPS2_VOLUME\n");
+	else if (header.caps.caps2 & DDSCAPS2_CUBEMAP)
+	{
+		printf("\t\tDDSCAPS2_CUBEMAP\n");
+		if ((header.caps.caps2 & DDSCAPS2_CUBEMAP_ALL_FACES) == DDSCAPS2_CUBEMAP_ALL_FACES) printf("\t\tDDSCAPS2_CUBEMAP_ALL_FACES\n");
+		else {
+			if (header.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEX) printf("\t\tDDSCAPS2_CUBEMAP_POSITIVEX\n");
+			if (header.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEX) printf("\t\tDDSCAPS2_CUBEMAP_NEGATIVEX\n");
+			if (header.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEY) printf("\t\tDDSCAPS2_CUBEMAP_POSITIVEY\n");
+			if (header.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEY) printf("\t\tDDSCAPS2_CUBEMAP_NEGATIVEY\n");
+			if (header.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEZ) printf("\t\tDDSCAPS2_CUBEMAP_POSITIVEZ\n");
+			if (header.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEZ) printf("\t\tDDSCAPS2_CUBEMAP_NEGATIVEZ\n");
+		}
+	}
+
+	printf("\tCaps 3: 0x%.8X\n", header.caps.caps3);
+	printf("\tCaps 4: 0x%.8X\n", header.caps.caps4);
+
+	if (header.reserved[9] == MAKEFOURCC('N', 'V', 'T', 'T'))
+	{
+		int major = (header.reserved[10] >> 16) & 0xFF;
+		int minor = (header.reserved[10] >> 8) & 0xFF;
+		int revision= header.reserved[10] & 0xFF;
+		
+		printf("Version:\n");
+		printf("\tNVIDIA Texture Tools %d.%d.%d\n", major, minor, revision);
+	}
+}
+