diff --git a/coders/dds.c b/coders/dds.c
new file mode 100644
index 0000000..63859fa
--- /dev/null
+++ b/coders/dds.c
@@ -0,0 +1,1015 @@
+/*
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %
+% %
+% %
+% DDDD DDDD SSSSS %
+% D D D D SS %
+% D D D D SSS %
+% D D D D SS %
+% DDDD DDDD SSSSS %
+% %
+% %
+% Read Microsoft Direct Draw Surface Image Format %
+% %
+% Software Design %
+% Bianca van Schaik %
+% March 2008 %
+% %
+% %
+% Copyright 1999-2009 ImageMagick Studio LLC, a non-profit organization %
+% dedicated to making software imaging solutions freely available. %
+% %
+% You may not use this file except in compliance with the License. You may %
+% obtain a copy of the License at %
+% %
+% http://www.imagemagick.org/script/license.php %
+% %
+% Unless required by applicable law or agreed to in writing, software %
+% distributed under the License is distributed on an "AS IS" BASIS, %
+% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
+% See the License for the specific language governing permissions and %
+% limitations under the License. %
+% %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+%
+*/
+
+/*
+ Include declarations.
+*/
+#include "magick/studio.h"
+#include "magick/blob.h"
+#include "magick/blob-private.h"
+#include "magick/cache.h"
+#include "magick/colorspace.h"
+#include "magick/exception.h"
+#include "magick/exception-private.h"
+#include "magick/image.h"
+#include "magick/image-private.h"
+#include "magick/list.h"
+#include "magick/log.h"
+#include "magick/magick.h"
+#include "magick/memory_.h"
+#include "magick/monitor.h"
+#include "magick/monitor-private.h"
+#include "magick/profile.h"
+#include "magick/quantum-private.h"
+#include "magick/static.h"
+#include "magick/string_.h"
+#include "magick/module.h"
+#include "magick/transform.h"
+#include "magick/studio.h"
+#include "magick/blob.h"
+#include "magick/blob-private.h"
+#include "magick/colorspace.h"
+#include "magick/exception.h"
+#include "magick/exception-private.h"
+#include "magick/compress.h"
+#include "magick/image.h"
+#include "magick/image-private.h"
+#include "magick/list.h"
+#include "magick/magick.h"
+#include "magick/memory_.h"
+#include "magick/monitor.h"
+#include "magick/monitor-private.h"
+#include "magick/quantum.h"
+#include "magick/static.h"
+#include "magick/string_.h"
+
+/*
+ Definitions
+*/
+#define DDSD_CAPS 0x00000001
+#define DDSD_HEIGHT 0x00000002
+#define DDSD_WIDTH 0x00000004
+#define DDSD_PITCH 0x00000008
+#define DDSD_PIXELFORMAT 0x00001000
+#define DDSD_MIPMAPCOUNT 0x00020000
+#define DDSD_LINEARSIZE 0x00080000
+#define DDSD_DEPTH 0x00800000
+
+#define DDPF_ALPHAPIXELS 0x00000001
+#define DDPF_FOURCC 0x00000004
+#define DDPF_RGB 0x00000040
+
+#define FOURCC_DXT1 0x31545844
+#define FOURCC_DXT3 0x33545844
+#define FOURCC_DXT5 0x35545844
+
+#define DDSCAPS_COMPLEX 0x00000008
+#define DDSCAPS_TEXTURE 0x00001000
+#define DDSCAPS_MIPMAP 0x00400000
+
+#define DDSCAPS2_CUBEMAP 0x00000200
+#define DDSCAPS2_CUBEMAP_POSITIVEX 0x00000400
+#define DDSCAPS2_CUBEMAP_NEGATIVEX 0x00000800
+#define DDSCAPS2_CUBEMAP_POSITIVEY 0x00001000
+#define DDSCAPS2_CUBEMAP_NEGATIVEY 0x00002000
+#define DDSCAPS2_CUBEMAP_POSITIVEZ 0x00004000
+#define DDSCAPS2_CUBEMAP_NEGATIVEZ 0x00008000
+#define DDSCAPS2_VOLUME 0x00200000
+
+/*
+ Structure declarations.
+*/
+typedef struct _DDSPixelFormat
+{
+ unsigned long
+ flags,
+ fourcc,
+ rgb_bitcount,
+ r_bitmask,
+ g_bitmask,
+ b_bitmask,
+ alpha_bitmask;
+} DDSPixelFormat;
+
+typedef struct _DDSInfo
+{
+ unsigned long
+ flags,
+ height,
+ width,
+ pitchOrLinearSize,
+ depth,
+ mipmapcount,
+ ddscaps1,
+ ddscaps2;
+
+ DDSPixelFormat
+ pixelformat;
+} DDSInfo;
+
+typedef struct _DDSColors
+{
+ unsigned char
+ r[4],
+ g[4],
+ b[4],
+ a[4];
+} DDSColors;
+
+typedef MagickBooleanType
+ DDSDecoder(Image *,DDSInfo *);
+
+/*
+ Macros
+*/
+#define C565_r(x) (((x) & 0xF800) >> 11)
+#define C565_g(x) (((x) & 0x07E0) >> 5)
+#define C565_b(x) ((x) & 0x001F)
+
+#define C565_red(x) ( (C565_r(x) << 3 | C565_r(x) >> 2))
+#define C565_green(x) ( (C565_g(x) << 2 | C565_g(x) >> 4))
+#define C565_blue(x) ( (C565_b(x) << 3 | C565_b(x) >> 2))
+
+#define DIV2(x) ((x) > 1 ? ((x) >> 1) : 1)
+
+/*
+ Forward declarations
+*/
+static MagickBooleanType
+ ReadDDSInfo(Image *image, DDSInfo *dds_info);
+
+static void
+ CalculateColors(unsigned short c0, unsigned short c1,
+ DDSColors *c, MagickBooleanType ignoreAlpha);
+
+static MagickBooleanType
+ ReadDXT1(Image *image, DDSInfo *dds_info);
+
+static MagickBooleanType
+ ReadDXT3(Image *image, DDSInfo *dds_info);
+
+static MagickBooleanType
+ ReadDXT5(Image *image, DDSInfo *dds_info);
+
+static MagickBooleanType
+ ReadUncompressedRGB(Image *image, DDSInfo *dds_info);
+
+static MagickBooleanType
+ ReadUncompressedRGBA(Image *image, DDSInfo *dds_info);
+
+static void
+ SkipDXTMipmaps(Image *image, DDSInfo *dds_info, int texel_size);
+
+static void
+ SkipRGBMipmaps(Image *image, DDSInfo *dds_info, int pixel_size);
+
+/*
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %
+% %
+% %
+% R e a d D D S I m a g e %
+% %
+% %
+% %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% ReadDDSImage() reads a DirectDraw Surface image file and returns it. It
+% allocates the memory necessary for the new Image structure and returns a
+% pointer to the new image.
+%
+% The format of the ReadDDSImage method is:
+%
+% Image *ReadDDSImage(const ImageInfo *image_info,ExceptionInfo *exception)
+%
+% A description of each parameter follows:
+%
+% o image_info: The image info.
+%
+% o exception: return any errors or warnings in this structure.
+%
+*/
+
+static inline unsigned long Min(unsigned long one, unsigned long two)
+{
+ if (one < two)
+ return one;
+ return two;
+}
+
+static Image *ReadDDSImage(const ImageInfo *image_info,ExceptionInfo *exception)
+{
+ Image
+ *image;
+
+ MagickBooleanType
+ status,
+ cubemap = MagickFalse,
+ volume = MagickFalse,
+ matte;
+
+ CompressionType
+ compression;
+
+ DDSInfo
+ dds_info;
+
+ DDSDecoder
+ *decoder;
+
+ unsigned long
+ n, num_images;
+
+ /*
+ Open image file.
+ */
+ assert(image_info != (const ImageInfo *) NULL);
+ assert(image_info->signature == MagickSignature);
+ if (image_info->debug != MagickFalse)
+ (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
+ image_info->filename);
+ assert(exception != (ExceptionInfo *) NULL);
+ assert(exception->signature == MagickSignature);
+ image=AcquireImage(image_info);
+ status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
+ if (status == MagickFalse)
+ {
+ image=DestroyImageList(image);
+ return((Image *) NULL);
+ }
+
+ /*
+ Initialize image structure.
+ */
+ if (ReadDDSInfo(image, &dds_info) != MagickTrue) {
+ ThrowReaderException(CorruptImageError,"ImproperImageHeader");
+ }
+
+ if (dds_info.ddscaps2 & DDSCAPS2_CUBEMAP)
+ cubemap = MagickTrue;
+
+ if (dds_info.ddscaps2 & DDSCAPS2_VOLUME && dds_info.depth > 0)
+ volume = MagickTrue;
+
+ (void) SeekBlob(image, 128, SEEK_SET);
+
+ /*
+ Determine pixel format
+ */
+ if (dds_info.pixelformat.flags & DDPF_RGB)
+ {
+ compression = NoCompression;
+ if (dds_info.pixelformat.flags & DDPF_ALPHAPIXELS)
+ {
+ matte = MagickTrue;
+ decoder = ReadUncompressedRGBA;
+ }
+ else
+ {
+ matte = MagickTrue;
+ decoder = ReadUncompressedRGB;
+ }
+ }
+ else if (dds_info.pixelformat.flags & DDPF_FOURCC)
+ {
+ switch (dds_info.pixelformat.fourcc)
+ {
+ case FOURCC_DXT1:
+ {
+ matte = MagickFalse;
+ compression = DXT1Compression;
+ decoder = ReadDXT1;
+ break;
+ }
+
+ case FOURCC_DXT3:
+ {
+ matte = MagickTrue;
+ compression = DXT3Compression;
+ decoder = ReadDXT3;
+ break;
+ }
+
+ case FOURCC_DXT5:
+ {
+ matte = MagickTrue;
+ compression = DXT5Compression;
+ decoder = ReadDXT5;
+ break;
+ }
+
+ default:
+ {
+ /* Unknown FOURCC */
+ ThrowReaderException(CorruptImageError, "ImageTypeNotSupported");
+ }
+ }
+ }
+ else
+ {
+ /* Neither compressed nor uncompressed... thus unsupported */
+ ThrowReaderException(CorruptImageError, "ImageTypeNotSupported");
+ }
+
+ num_images = 1;
+ if (cubemap)
+ {
+ /*
+ Determine number of faces defined in the cubemap
+ */
+ num_images = 0;
+ if (dds_info.ddscaps2 & DDSCAPS2_CUBEMAP_POSITIVEX) num_images++;
+ if (dds_info.ddscaps2 & DDSCAPS2_CUBEMAP_NEGATIVEX) num_images++;
+ if (dds_info.ddscaps2 & DDSCAPS2_CUBEMAP_POSITIVEY) num_images++;
+ if (dds_info.ddscaps2 & DDSCAPS2_CUBEMAP_NEGATIVEY) num_images++;
+ if (dds_info.ddscaps2 & DDSCAPS2_CUBEMAP_POSITIVEZ) num_images++;
+ if (dds_info.ddscaps2 & DDSCAPS2_CUBEMAP_NEGATIVEZ) num_images++;
+ }
+
+ if (volume)
+ num_images = dds_info.depth;
+
+ for (n = 0; n < num_images; n++)
+ {
+ if (n != 0)
+ {
+ /* Start a new image */
+ AcquireNextImage(image_info,image);
+ if (GetNextImageInList(image) == (Image *) NULL)
+ {
+ image = DestroyImageList(image);
+ return((Image *) NULL);
+ }
+ image=SyncNextImageInList(image);
+ }
+
+ image->matte = matte;
+ image->compression = compression;
+ image->columns = dds_info.width;
+ image->rows = dds_info.height;
+ image->storage_class = DirectClass;
+ image->endian = LSBEndian;
+ image->depth = 8;
+ if (image_info->ping != MagickFalse)
+ {
+ (void) CloseBlob(image);
+ return(GetFirstImageInList(image));
+ }
+
+ if ((decoder)(image, &dds_info) != MagickTrue)
+ {
+ (void) CloseBlob(image);
+ return(GetFirstImageInList(image));
+ }
+ }
+
+ if (EOFBlob(image) != MagickFalse)
+ ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
+ image->filename);
+
+ (void) CloseBlob(image);
+ return(GetFirstImageInList(image));
+}
+
+static MagickBooleanType ReadDDSInfo(Image *image, DDSInfo *dds_info)
+{
+ unsigned long
+ hdr_size,
+ required;
+
+ /* Seek to start of header */
+ (void) SeekBlob(image, 4, SEEK_SET);
+
+ /* Check header field */
+ hdr_size = ReadBlobLSBLong(image);
+ if (hdr_size != 124)
+ return MagickFalse;
+
+ /* Fill in DDS info struct */
+ dds_info->flags = ReadBlobLSBLong(image);
+
+ /* Check required flags */
+ required=(unsigned long) (DDSD_WIDTH | DDSD_HEIGHT | DDSD_PIXELFORMAT);
+ if ((dds_info->flags & required) != required)
+ return MagickFalse;
+
+ dds_info->height = ReadBlobLSBLong(image);
+ dds_info->width = ReadBlobLSBLong(image);
+ dds_info->pitchOrLinearSize = ReadBlobLSBLong(image);
+ dds_info->depth = ReadBlobLSBLong(image);
+ dds_info->mipmapcount = ReadBlobLSBLong(image);
+
+ (void) SeekBlob(image, 44, SEEK_CUR); /* reserved region of 11 DWORDs */
+
+ /* Read pixel format structure */
+ hdr_size = ReadBlobLSBLong(image);
+ if (hdr_size != 32)
+ return MagickFalse;
+
+ dds_info->pixelformat.flags = ReadBlobLSBLong(image);
+ dds_info->pixelformat.fourcc = ReadBlobLSBLong(image);
+ dds_info->pixelformat.rgb_bitcount = ReadBlobLSBLong(image);
+ dds_info->pixelformat.r_bitmask = ReadBlobLSBLong(image);
+ dds_info->pixelformat.g_bitmask = ReadBlobLSBLong(image);
+ dds_info->pixelformat.b_bitmask = ReadBlobLSBLong(image);
+ dds_info->pixelformat.alpha_bitmask = ReadBlobLSBLong(image);
+
+ dds_info->ddscaps1 = ReadBlobLSBLong(image);
+ dds_info->ddscaps2 = ReadBlobLSBLong(image);
+ (void) SeekBlob(image, 12, SEEK_CUR); /* 3 reserved DWORDs */
+
+ return MagickTrue;
+}
+
+static void CalculateColors(unsigned short c0, unsigned short c1,
+ DDSColors *c, MagickBooleanType ignoreAlpha)
+{
+ c->a[0] = c->a[1] = c->a[2] = c->a[3] = 0;
+
+ c->r[0] = (unsigned char) C565_red(c0);
+ c->g[0] = (unsigned char) C565_green(c0);
+ c->b[0] = (unsigned char) C565_blue(c0);
+
+ c->r[1] = (unsigned char) C565_red(c1);
+ c->g[1] = (unsigned char) C565_green(c1);
+ c->b[1] = (unsigned char) C565_blue(c1);
+
+ if (ignoreAlpha == MagickTrue || c0 > c1)
+ {
+ c->r[2] = (unsigned char) ((2 * c->r[0] + c->r[1]) / 3);
+ c->g[2] = (unsigned char) ((2 * c->g[0] + c->g[1]) / 3);
+ c->b[2] = (unsigned char) ((2 * c->b[0] + c->b[1]) / 3);
+
+ c->r[3] = (unsigned char) ((c->r[0] + 2 * c->r[1]) / 3);
+ c->g[3] = (unsigned char) ((c->g[0] + 2 * c->g[1]) / 3);
+ c->b[3] = (unsigned char) ((c->b[0] + 2 * c->b[1]) / 3);
+ }
+ else
+ {
+ c->r[2] = (unsigned char) ((c->r[0] + c->r[1]) / 2);
+ c->g[2] = (unsigned char) ((c->g[0] + c->g[1]) / 2);
+ c->b[2] = (unsigned char) ((c->b[0] + c->b[1]) / 2);
+
+ c->r[3] = c->g[3] = c->b[3] = 0;
+ c->a[3] = 255;
+ }
+}
+
+static MagickBooleanType ReadDXT1(Image *image, DDSInfo *dds_info)
+{
+ DDSColors
+ colors;
+
+ ExceptionInfo
+ *exception;
+
+ long
+ j,
+ y;
+
+ PixelPacket
+ *q;
+
+ register long
+ i,
+ x;
+
+ unsigned char
+ code;
+
+ unsigned short
+ c0,
+ c1;
+
+ unsigned long
+ bits;
+
+ exception=(&image->exception);
+ for (y = 0; y < (long) dds_info->height; y += 4)
+ {
+ for (x = 0; x < (long) dds_info->width; x += 4)
+ {
+ /* Get 4x4 patch of pixels to write on */
+ q = QueueAuthenticPixels(image, x, y, Min(4, dds_info->width - x),
+ Min(4, dds_info->height - y),exception);
+
+ if (q == (PixelPacket *) NULL)
+ return MagickFalse;
+
+ /* Read 8 bytes of data from the image */
+ c0 = ReadBlobLSBShort(image);
+ c1 = ReadBlobLSBShort(image);
+ bits = ReadBlobLSBLong(image);
+
+ CalculateColors(c0, c1, &colors, MagickFalse);
+
+ /* Write the pixels */
+ for (j = 0; j < 4; j++)
+ {
+ for (i = 0; i < 4; i++)
+ {
+ if ((x + i) < (long) dds_info->width && (y + j) < (long) dds_info->height)
+ {
+ code = (unsigned char) ((bits >> ((j*4+i)*2)) & 0x3);
+ q->red = ScaleCharToQuantum( colors.r[code] );
+ q->green = ScaleCharToQuantum( colors.g[code] );
+ q->blue = ScaleCharToQuantum( colors.b[code] );
+ q->opacity = ScaleCharToQuantum( colors.a[code] );
+ if (colors.a[code] && image->matte == MagickFalse)
+ /* Correct matte */
+ image->matte = MagickTrue;
+ q++;
+ }
+ }
+ }
+
+ if (SyncAuthenticPixels(image,exception) == MagickFalse)
+ return MagickFalse;
+ }
+ }
+
+ SkipDXTMipmaps(image, dds_info, 8);
+
+ return MagickTrue;
+}
+
+static MagickBooleanType ReadDXT3(Image *image, DDSInfo *dds_info)
+{
+ DDSColors
+ colors;
+
+ ExceptionInfo
+ *exception;
+
+ long
+ j,
+ y;
+
+ PixelPacket
+ *q;
+
+ register long
+ i,
+ x;
+
+ unsigned char
+ alpha;
+
+ unsigned long
+ a0,
+ a1,
+ bits,
+ code;
+
+ unsigned short
+ c0,
+ c1;
+
+ exception=(&image->exception);
+ for (y = 0; y < (long) dds_info->height; y += 4)
+ {
+ for (x = 0; x < (long) dds_info->width; x += 4)
+ {
+ /* Get 4x4 patch of pixels to write on */
+ q = QueueAuthenticPixels(image, x, y, Min(4, dds_info->width - x),
+ Min(4, dds_info->height - y),exception);
+
+ if (q == (PixelPacket *) NULL)
+ return MagickFalse;
+
+ /* Read alpha values (8 bytes) */
+ a0 = ReadBlobLSBLong(image);
+ a1 = ReadBlobLSBLong(image);
+
+ /* Read 8 bytes of data from the image */
+ c0 = ReadBlobLSBShort(image);
+ c1 = ReadBlobLSBShort(image);
+ bits = ReadBlobLSBLong(image);
+
+ CalculateColors(c0, c1, &colors, MagickTrue);
+
+ /* Write the pixels */
+ for (j = 0; j < 4; j++)
+ {
+ for (i = 0; i < 4; i++)
+ {
+ if ((x + i) < (long) dds_info->width && (y + j) < (long) dds_info->height)
+ {
+ code = (bits >> ((4*j+i)*2)) & 0x3;
+ q->red = ScaleCharToQuantum( colors.r[code] );
+ q->green = ScaleCharToQuantum( colors.g[code] );
+ q->blue = ScaleCharToQuantum( colors.b[code] );
+
+ /*
+ Extract alpha value: multiply 0..15 by 17 to get range 0..255
+ */
+ if (j < 2)
+ alpha = 17U * (unsigned char) ((a0 >> (4*(4*j+i))) & 0xf);
+ else
+ alpha = 17U * (unsigned char) ((a1 >> (4*(4*(j-2)+i))) & 0xf);
+
+ q->opacity = ScaleCharToQuantum( (unsigned char) (255 - alpha) );
+
+ q++;
+ }
+ }
+ }
+
+ if (SyncAuthenticPixels(image,exception) == MagickFalse)
+ return MagickFalse;
+ }
+ }
+
+ SkipDXTMipmaps(image, dds_info, 16);
+
+ return MagickTrue;
+}
+
+static MagickBooleanType ReadDXT5(Image *image, DDSInfo *dds_info)
+{
+ DDSColors
+ colors;
+
+ ExceptionInfo
+ *exception;
+
+ long
+ j,
+ y;
+
+ MagickSizeType
+ alpha_bits;
+
+ PixelPacket
+ *q;
+
+ register long
+ i,
+ x;
+
+ unsigned char
+ a0,
+ a1;
+
+ unsigned long
+ alpha,
+ bits,
+ code,
+ alpha_code;
+
+ unsigned short
+ c0,
+ c1;
+
+ exception=(&image->exception);
+ for (y = 0; y < (long) dds_info->height; y += 4)
+ {
+ for (x = 0; x < (long) dds_info->width; x += 4)
+ {
+ /* Get 4x4 patch of pixels to write on */
+ q = QueueAuthenticPixels(image, x, y, Min(4, dds_info->width - x),
+ Min(4, dds_info->height - y),exception);
+
+ if (q == (PixelPacket *) NULL)
+ return MagickFalse;
+
+ /* Read alpha values (8 bytes) */
+ a0 = (unsigned char) ReadBlobByte(image);
+ a1 = (unsigned char) ReadBlobByte(image);
+
+ alpha_bits = (MagickSizeType)ReadBlobLSBLong(image)
+ | ((MagickSizeType)ReadBlobLSBShort(image) << 32);
+
+ /* Read 8 bytes of data from the image */
+ c0 = ReadBlobLSBShort(image);
+ c1 = ReadBlobLSBShort(image);
+ bits = ReadBlobLSBLong(image);
+
+ CalculateColors(c0, c1, &colors, MagickTrue);
+
+ /* Write the pixels */
+ for (j = 0; j < 4; j++)
+ {
+ for (i = 0; i < 4; i++)
+ {
+ if ((x + i) < (long) dds_info->width && (y + j) < (long) dds_info->height)
+ {
+ code = (bits >> ((4*j+i)*2)) & 0x3;
+ q->red = ScaleCharToQuantum( colors.r[code] );
+ q->green = ScaleCharToQuantum( colors.g[code] );
+ q->blue = ScaleCharToQuantum( colors.b[code] );
+
+ /* Extract alpha value */
+ alpha_code = (unsigned long) (alpha_bits >> (3*(4*j+i))) & 0x7;
+ if (alpha_code == 0)
+ alpha = a0;
+ else if (alpha_code == 1)
+ alpha = a1;
+ else if (a0 > a1)
+ alpha = ((8-alpha_code) * a0 + (alpha_code-1) * a1) / 7;
+ else if (alpha_code == 6)
+ alpha = alpha_code;
+ else if (alpha_code == 7)
+ alpha = 255;
+ else
+ alpha = (((6-alpha_code) * a0 + (alpha_code-1) * a1) / 5);
+
+ q->opacity = ScaleCharToQuantum( (unsigned char) (255 - alpha) );
+
+ q++;
+ }
+ }
+ }
+
+ if (SyncAuthenticPixels(image,exception) == MagickFalse)
+ return MagickFalse;
+ }
+ }
+
+ SkipDXTMipmaps(image, dds_info, 16);
+
+ return MagickTrue;
+}
+
+static MagickBooleanType ReadUncompressedRGB(Image *image, DDSInfo *dds_info)
+{
+ ExceptionInfo
+ *exception;
+
+ long
+ x, y;
+
+ PixelPacket
+ *q;
+
+ exception=(&image->exception);
+ for (y = 0; y < (long) dds_info->height; y++)
+ {
+ q = QueueAuthenticPixels(image, 0, y, dds_info->width, 1,exception);
+
+ if (q == (PixelPacket *) NULL)
+ return MagickFalse;
+
+ for (x = 0; x < (long) dds_info->width; x++)
+ {
+ q->blue = ScaleCharToQuantum( (unsigned char) ReadBlobByte(image) );
+ q->green = ScaleCharToQuantum( (unsigned char) ReadBlobByte(image) );
+ q->red = ScaleCharToQuantum( (unsigned char) ReadBlobByte(image) );
+ q++;
+ }
+
+ if (SyncAuthenticPixels(image,exception) == MagickFalse)
+ return MagickFalse;
+ }
+
+ SkipRGBMipmaps(image, dds_info, 3);
+
+ return MagickTrue;
+}
+
+static MagickBooleanType ReadUncompressedRGBA(Image *image, DDSInfo *dds_info)
+{
+ ExceptionInfo
+ *exception;
+
+ long
+ x, y;
+
+ PixelPacket
+ *q;
+
+ exception=(&image->exception);
+ for (y = 0; y < (long) dds_info->height; y++)
+ {
+ q = QueueAuthenticPixels(image, 0, y, dds_info->width, 1,exception);
+
+ if (q == (PixelPacket *) NULL)
+ return MagickFalse;
+
+ for (x = 0; x < (long) dds_info->width; x++)
+ {
+ q->blue = ScaleCharToQuantum( (unsigned char) ReadBlobByte(image) );
+ q->green = ScaleCharToQuantum( (unsigned char) ReadBlobByte(image) );
+ q->red = ScaleCharToQuantum( (unsigned char) ReadBlobByte(image) );
+ q->opacity = ScaleCharToQuantum( (unsigned char) (255 - ReadBlobByte(image)) );
+ q++;
+ }
+
+ if (SyncAuthenticPixels(image,exception) == MagickFalse)
+ return MagickFalse;
+ }
+
+ SkipRGBMipmaps(image, dds_info, 4);
+
+ return MagickTrue;
+}
+
+/*
+ Skip the mipmap images for compressed (DXTn) dds files
+*/
+static void SkipDXTMipmaps(Image *image, DDSInfo *dds_info, int texel_size)
+{
+ register long
+ i;
+
+ MagickOffsetType
+ offset;
+
+ unsigned long
+ h,
+ w;
+
+ /*
+ Only skip mipmaps for textures and cube maps
+ */
+ if (dds_info->ddscaps1 & DDSCAPS_MIPMAP
+ && (dds_info->ddscaps1 & DDSCAPS_TEXTURE
+ || dds_info->ddscaps2 & DDSCAPS2_CUBEMAP))
+ {
+ w = DIV2(dds_info->width);
+ h = DIV2(dds_info->height);
+
+ /*
+ Mipmapcount includes the main image, so start from one
+ */
+ for (i = 1; (i < (long) dds_info->mipmapcount) && w && h; i++)
+ {
+ offset = (MagickOffsetType) ((w + 3) / 4) * ((h + 3) / 4) * texel_size;
+ (void) SeekBlob(image, offset, SEEK_CUR);
+
+ w = DIV2(w);
+ h = DIV2(h);
+ }
+ }
+}
+
+/*
+ Skip the mipmap images for uncompressed (RGB or RGBA) dds files
+*/
+static void SkipRGBMipmaps(Image *image, DDSInfo *dds_info, int pixel_size)
+{
+ MagickOffsetType
+ offset;
+
+ register long
+ i;
+
+ unsigned long
+ h,
+ w;
+
+ /*
+ Only skip mipmaps for textures and cube maps
+ */
+ if (dds_info->ddscaps1 & DDSCAPS_MIPMAP
+ && (dds_info->ddscaps1 & DDSCAPS_TEXTURE
+ || dds_info->ddscaps2 & DDSCAPS2_CUBEMAP))
+ {
+ w = DIV2(dds_info->width);
+ h = DIV2(dds_info->height);
+
+ /*
+ Mipmapcount includes the main image, so start from one
+ */
+ for (i=1; (i < (long) dds_info->mipmapcount) && w && h; i++)
+ {
+ offset = (MagickOffsetType) w * h * pixel_size;
+ (void) SeekBlob(image, offset, SEEK_CUR);
+
+ w = DIV2(w);
+ h = DIV2(h);
+ }
+ }
+}
+
+/*
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %
+% %
+% %
+% I s D D S %
+% %
+% %
+% %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% IsDDS() returns MagickTrue if the image format type, identified by the
+% magick string, is DDS.
+%
+% The format of the IsDDS method is:
+%
+% MagickBooleanType IsDDS(const unsigned char *magick,const size_t length)
+%
+% A description of each parameter follows:
+%
+% o magick: compare image format pattern against these bytes.
+%
+% o length: Specifies the length of the magick string.
+%
+*/
+static MagickBooleanType IsDDS(const unsigned char *magick,const size_t length)
+{
+ if (length < 4)
+ return(MagickFalse);
+ if (LocaleNCompare((char *) magick,"DDS ", 4) == 0)
+ return(MagickTrue);
+ return(MagickFalse);
+}
+
+/*
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %
+% %
+% %
+% R e g i s t e r D D S I m a g e %
+% %
+% %
+% %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% RegisterDDSImage() adds attributes for the DDS image format to
+% the list of supported formats. The attributes include the image format
+% tag, a method to read and/or write the format, whether the format
+% supports the saving of more than one frame to the same file or blob,
+% whether the format supports native in-memory I/O, and a brief
+% description of the format.
+%
+% The format of the RegisterDDSImage method is:
+%
+% RegisterDDSImage(void)
+%
+*/
+ModuleExport unsigned long RegisterDDSImage(void)
+{
+ MagickInfo
+ *entry;
+
+ entry = SetMagickInfo("DDS");
+ entry->decoder = (DecodeImageHandler *) ReadDDSImage;
+ entry->magick = (IsImageFormatHandler *) IsDDS;
+ entry->description = ConstantString("Microsoft DirectDraw Surface");
+ entry->module = ConstantString("DDS");
+ (void) RegisterMagickInfo(entry);
+ return(MagickImageCoderSignature);
+}
+
+
+/*
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %
+% %
+% %
+% U n r e g i s t e r D D S I m a g e %
+% %
+% %
+% %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% UnregisterDDSImage() removes format registrations made by the
+% DDS module from the list of supported formats.
+%
+% The format of the UnregisterDDSImage method is:
+%
+% UnregisterDDSImage(void)
+%
+*/
+ModuleExport void UnregisterDDSImage(void)
+{
+ (void) UnregisterMagickInfo("DDS");
+}
+