| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % 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 1999-2011 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 "MagickCore/studio.h" |
| #include "MagickCore/blob.h" |
| #include "MagickCore/blob-private.h" |
| #include "MagickCore/cache.h" |
| #include "MagickCore/colorspace.h" |
| #include "MagickCore/exception.h" |
| #include "MagickCore/exception-private.h" |
| #include "MagickCore/image.h" |
| #include "MagickCore/image-private.h" |
| #include "MagickCore/list.h" |
| #include "MagickCore/log.h" |
| #include "MagickCore/magick.h" |
| #include "MagickCore/memory_.h" |
| #include "MagickCore/monitor.h" |
| #include "MagickCore/monitor-private.h" |
| #include "MagickCore/profile.h" |
| #include "MagickCore/quantum-private.h" |
| #include "MagickCore/static.h" |
| #include "MagickCore/string_.h" |
| #include "MagickCore/module.h" |
| #include "MagickCore/transform.h" |
| #include "MagickCore/studio.h" |
| #include "MagickCore/blob.h" |
| #include "MagickCore/blob-private.h" |
| #include "MagickCore/colorspace.h" |
| #include "MagickCore/exception.h" |
| #include "MagickCore/exception-private.h" |
| #include "MagickCore/compress.h" |
| #include "MagickCore/image.h" |
| #include "MagickCore/image-private.h" |
| #include "MagickCore/list.h" |
| #include "MagickCore/magick.h" |
| #include "MagickCore/memory_.h" |
| #include "MagickCore/monitor.h" |
| #include "MagickCore/monitor-private.h" |
| #include "MagickCore/pixel-accessor.h" |
| #include "MagickCore/quantum.h" |
| #include "MagickCore/static.h" |
| #include "MagickCore/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 |
| { |
| size_t |
| flags, |
| fourcc, |
| rgb_bitcount, |
| r_bitmask, |
| g_bitmask, |
| b_bitmask, |
| alpha_bitmask; |
| } DDSPixelFormat; |
| |
| typedef struct _DDSInfo |
| { |
| size_t |
| 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 size_t Min(size_t one, size_t 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; |
| |
| size_t |
| 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) |
| { |
| size_t |
| 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=(size_t) (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; |
| |
| register Quantum |
| *q; |
| |
| register ssize_t |
| i, |
| x; |
| |
| size_t |
| bits; |
| |
| ssize_t |
| j, |
| y; |
| |
| unsigned char |
| code; |
| |
| unsigned short |
| c0, |
| c1; |
| |
| exception=(&image->exception); |
| for (y = 0; y < (ssize_t) dds_info->height; y += 4) |
| { |
| for (x = 0; x < (ssize_t) 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 == (Quantum *) 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) < (ssize_t) dds_info->width && |
| (y + j) < (ssize_t) dds_info->height) |
| { |
| code = (unsigned char) ((bits >> ((j*4+i)*2)) & 0x3); |
| SetPixelRed(image,ScaleCharToQuantum(colors.r[code]),q); |
| SetPixelGreen(image,ScaleCharToQuantum(colors.g[code]),q); |
| SetPixelBlue(image,ScaleCharToQuantum(colors.b[code]),q); |
| SetPixelAlpha(image,ScaleCharToQuantum(colors.a[code]),q); |
| if (colors.a[code] && (image->matte == MagickFalse)) |
| image->matte=MagickTrue; /* Correct matte */ |
| q+=GetPixelChannels(image); |
| } |
| } |
| } |
| |
| 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; |
| |
| register Quantum |
| *q; |
| |
| register ssize_t |
| i, |
| x; |
| |
| unsigned char |
| alpha; |
| |
| size_t |
| a0, |
| a1, |
| bits, |
| code; |
| |
| ssize_t |
| j, |
| y; |
| |
| unsigned short |
| c0, |
| c1; |
| |
| exception=(&image->exception); |
| for (y = 0; y < (ssize_t) dds_info->height; y += 4) |
| { |
| for (x = 0; x < (ssize_t) 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 == (Quantum *) 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) < (ssize_t) dds_info->width && (y + j) < (ssize_t) dds_info->height) |
| { |
| code = (bits >> ((4*j+i)*2)) & 0x3; |
| SetPixelRed(image,ScaleCharToQuantum(colors.r[code]),q); |
| SetPixelGreen(image,ScaleCharToQuantum(colors.g[code]),q); |
| SetPixelBlue(image,ScaleCharToQuantum(colors.b[code]),q); |
| /* |
| 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); |
| SetPixelAlpha(image,ScaleCharToQuantum((unsigned char) alpha),q); |
| q+=GetPixelChannels(image); |
| } |
| } |
| } |
| |
| 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; |
| |
| MagickSizeType |
| alpha_bits; |
| |
| register Quantum |
| *q; |
| |
| register ssize_t |
| i, |
| x; |
| |
| unsigned char |
| a0, |
| a1; |
| |
| size_t |
| alpha, |
| bits, |
| code, |
| alpha_code; |
| |
| ssize_t |
| j, |
| y; |
| |
| unsigned short |
| c0, |
| c1; |
| |
| exception=(&image->exception); |
| for (y = 0; y < (ssize_t) dds_info->height; y += 4) |
| { |
| for (x = 0; x < (ssize_t) 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 == (Quantum *) 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) < (ssize_t) dds_info->width && |
| (y + j) < (ssize_t) dds_info->height) |
| { |
| code = (bits >> ((4*j+i)*2)) & 0x3; |
| SetPixelRed(image,ScaleCharToQuantum(colors.r[code]),q); |
| SetPixelGreen(image,ScaleCharToQuantum(colors.g[code]),q); |
| SetPixelBlue(image,ScaleCharToQuantum(colors.b[code]),q); |
| /* Extract alpha value */ |
| alpha_code = (size_t) (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); |
| SetPixelAlpha(image,ScaleCharToQuantum((unsigned char) alpha),q); |
| q+=GetPixelChannels(image); |
| } |
| } |
| } |
| |
| if (SyncAuthenticPixels(image,exception) == MagickFalse) |
| return MagickFalse; |
| } |
| } |
| |
| SkipDXTMipmaps(image, dds_info, 16); |
| |
| return MagickTrue; |
| } |
| |
| static MagickBooleanType ReadUncompressedRGB(Image *image, DDSInfo *dds_info) |
| { |
| ExceptionInfo |
| *exception; |
| |
| ssize_t |
| x, y; |
| |
| register Quantum |
| *q; |
| |
| exception=(&image->exception); |
| for (y = 0; y < (ssize_t) dds_info->height; y++) |
| { |
| q = QueueAuthenticPixels(image, 0, y, dds_info->width, 1,exception); |
| |
| if (q == (Quantum *) NULL) |
| return MagickFalse; |
| |
| for (x = 0; x < (ssize_t) dds_info->width; x++) |
| { |
| SetPixelBlue(image,ScaleCharToQuantum((unsigned char) |
| ReadBlobByte(image)),q); |
| SetPixelGreen(image,ScaleCharToQuantum((unsigned char) |
| ReadBlobByte(image)),q); |
| SetPixelRed(image,ScaleCharToQuantum((unsigned char) |
| ReadBlobByte(image)),q); |
| if (dds_info->pixelformat.rgb_bitcount == 32) |
| (void) ReadBlobByte(image); |
| q+=GetPixelChannels(image); |
| } |
| |
| if (SyncAuthenticPixels(image,exception) == MagickFalse) |
| return MagickFalse; |
| } |
| |
| SkipRGBMipmaps(image, dds_info, 3); |
| |
| return MagickTrue; |
| } |
| |
| static MagickBooleanType ReadUncompressedRGBA(Image *image, DDSInfo *dds_info) |
| { |
| ExceptionInfo |
| *exception; |
| |
| ssize_t |
| x, y; |
| |
| register Quantum |
| *q; |
| |
| exception=(&image->exception); |
| for (y = 0; y < (ssize_t) dds_info->height; y++) |
| { |
| q = QueueAuthenticPixels(image, 0, y, dds_info->width, 1,exception); |
| |
| if (q == (Quantum *) NULL) |
| return MagickFalse; |
| |
| for (x = 0; x < (ssize_t) dds_info->width; x++) |
| { |
| SetPixelBlue(image,ScaleCharToQuantum((unsigned char) |
| ReadBlobByte(image)),q); |
| SetPixelGreen(image,ScaleCharToQuantum((unsigned char) |
| ReadBlobByte(image)),q); |
| SetPixelRed(image,ScaleCharToQuantum((unsigned char) |
| ReadBlobByte(image)),q); |
| SetPixelAlpha(image,ScaleCharToQuantum((unsigned char) |
| ReadBlobByte(image)),q); |
| q+=GetPixelChannels(image); |
| } |
| |
| 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) |
| { |
| MagickOffsetType |
| offset; |
| |
| register ssize_t |
| i; |
| |
| size_t |
| 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 < (ssize_t) 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 ssize_t |
| i; |
| |
| size_t |
| 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 < (ssize_t) 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 size_t RegisterDDSImage(void) |
| { |
| MagickInfo |
| *entry; |
| |
| entry = SetMagickInfo("DDS"); |
| entry->decoder = (DecodeImageHandler *) ReadDDSImage; |
| entry->magick = (IsImageFormatHandler *) IsDDS; |
| entry->seekable_stream=MagickTrue; |
| 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"); |
| } |
| |