DRC | 2e7b76b | 2009-04-03 12:04:24 +0000 | [diff] [blame] | 1 | /* Copyright (C)2004 Landmark Graphics Corporation |
| 2 | * Copyright (C)2005, 2006 Sun Microsystems, Inc. |
DRC | 61e51f9 | 2009-04-05 21:53:20 +0000 | [diff] [blame] | 3 | * Copyright (C)2009 D. R. Commander |
DRC | 2e7b76b | 2009-04-03 12:04:24 +0000 | [diff] [blame] | 4 | * |
| 5 | * This library is free software and may be redistributed and/or modified under |
| 6 | * the terms of the wxWindows Library License, Version 3.1 or (at your option) |
| 7 | * any later version. The full license is in the LICENSE.txt file included |
| 8 | * with this distribution. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * wxWindows Library License for more details. |
| 14 | */ |
| 15 | |
| 16 | #if (defined(_MSC_VER) || defined(__CYGWIN__) || defined(__MINGW32__)) && defined(_WIN32) && defined(DLLDEFINE) |
| 17 | #define DLLEXPORT __declspec(dllexport) |
| 18 | #else |
| 19 | #define DLLEXPORT |
| 20 | #endif |
| 21 | |
| 22 | #define DLLCALL |
| 23 | |
| 24 | /* Subsampling */ |
| 25 | #define NUMSUBOPT 4 |
| 26 | |
DRC | 61e51f9 | 2009-04-05 21:53:20 +0000 | [diff] [blame] | 27 | enum {TJ_444=0, TJ_422, TJ_420, TJ_GRAYSCALE}; |
DRC | 2e7b76b | 2009-04-03 12:04:24 +0000 | [diff] [blame] | 28 | |
| 29 | /* Flags */ |
| 30 | #define TJ_BGR 1 |
| 31 | #define TJ_BOTTOMUP 2 |
| 32 | #define TJ_FORCEMMX 8 /* Force IPP to use MMX code even if SSE available */ |
| 33 | #define TJ_FORCESSE 16 /* Force IPP to use SSE1 code even if SSE2 available */ |
| 34 | #define TJ_FORCESSE2 32 /* Force IPP to use SSE2 code (useful if auto-detect is not working properly) */ |
| 35 | #define TJ_ALPHAFIRST 64 /* BGR buffer is ABGR and RGB buffer is ARGB */ |
| 36 | #define TJ_FORCESSE3 128 /* Force IPP to use SSE3 code (useful if auto-detect is not working properly) */ |
DRC | 61e51f9 | 2009-04-05 21:53:20 +0000 | [diff] [blame] | 37 | #define TJ_FASTUPSAMPLE 256 /* Use fast, inaccurate 4:2:2 and 4:2:0 YUV upsampling routines in libjpeg decompressor */ |
DRC | 2e7b76b | 2009-04-03 12:04:24 +0000 | [diff] [blame] | 38 | |
| 39 | typedef void* tjhandle; |
| 40 | |
| 41 | #define TJPAD(p) (((p)+3)&(~3)) |
| 42 | #ifndef max |
| 43 | #define max(a,b) ((a)>(b)?(a):(b)) |
| 44 | #endif |
| 45 | |
| 46 | #ifdef __cplusplus |
| 47 | extern "C" { |
| 48 | #endif |
| 49 | |
| 50 | /* API follows */ |
| 51 | |
| 52 | |
| 53 | /* |
| 54 | tjhandle tjInitCompress(void) |
| 55 | |
| 56 | Creates a new JPEG compressor instance, allocates memory for the structures, |
| 57 | and returns a handle to the instance. Most applications will only |
| 58 | need to call this once at the beginning of the program or once for each |
| 59 | concurrent thread. Don't try to create a new instance every time you |
| 60 | compress an image, because this will cause performance to suffer. |
| 61 | |
| 62 | RETURNS: NULL on error |
| 63 | */ |
| 64 | DLLEXPORT tjhandle DLLCALL tjInitCompress(void); |
| 65 | |
| 66 | |
| 67 | /* |
| 68 | int tjCompress(tjhandle j, |
| 69 | unsigned char *srcbuf, int width, int pitch, int height, int pixelsize, |
| 70 | unsigned char *dstbuf, unsigned long *size, |
| 71 | int jpegsubsamp, int jpegqual, int flags) |
| 72 | |
| 73 | [INPUT] j = instance handle previously returned from a call to |
| 74 | tjInitCompress() |
| 75 | [INPUT] srcbuf = pointer to user-allocated image buffer containing pixels in |
| 76 | RGB(A) or BGR(A) form |
| 77 | [INPUT] width = width (in pixels) of the source image |
| 78 | [INPUT] pitch = bytes per line of the source image (width*pixelsize if the |
| 79 | bitmap is unpadded, else TJPAD(width*pixelsize) if each line of the bitmap |
| 80 | is padded to the nearest 32-bit boundary, such as is the case for Windows |
| 81 | bitmaps. You can also be clever and use this parameter to skip lines, etc., |
| 82 | as long as the pitch is greater than 0.) |
| 83 | [INPUT] height = height (in pixels) of the source image |
| 84 | [INPUT] pixelsize = size (in bytes) of each pixel in the source image |
| 85 | RGBA and BGRA: 4, RGB and BGR: 3 |
| 86 | [INPUT] dstbuf = pointer to user-allocated image buffer which will receive |
| 87 | the JPEG image. Use the macro TJBUFSIZE(width, height) to determine |
| 88 | the appropriate size for this buffer based on the image width and height. |
| 89 | [OUTPUT] size = pointer to unsigned long which receives the size (in bytes) |
| 90 | of the compressed image |
DRC | 61e51f9 | 2009-04-05 21:53:20 +0000 | [diff] [blame] | 91 | [INPUT] jpegsubsamp = Specifies either 4:2:0, 4:2:2, or 4:4:4 subsampling. |
DRC | 2e7b76b | 2009-04-03 12:04:24 +0000 | [diff] [blame] | 92 | When the image is converted from the RGB to YCbCr colorspace as part of the |
| 93 | JPEG compression process, every other Cb and Cr (chrominance) pixel can be |
| 94 | discarded to produce a smaller image with little perceptible loss of |
| 95 | image clarity (the human eye is more sensitive to small changes in |
| 96 | brightness than small changes in color.) |
| 97 | |
DRC | 61e51f9 | 2009-04-05 21:53:20 +0000 | [diff] [blame] | 98 | TJ_420: 4:2:0 subsampling. Discards every other Cb, Cr pixel in both |
DRC | 2e7b76b | 2009-04-03 12:04:24 +0000 | [diff] [blame] | 99 | horizontal and vertical directions. |
| 100 | TJ_422: 4:2:2 subsampling. Discards every other Cb, Cr pixel only in |
| 101 | the horizontal direction. |
| 102 | TJ_444: no subsampling. |
| 103 | TJ_GRAYSCALE: Generate grayscale JPEG image |
| 104 | |
| 105 | [INPUT] jpegqual = JPEG quality (an integer between 0 and 100 inclusive.) |
| 106 | [INPUT] flags = the bitwise OR of one or more of the following |
| 107 | |
| 108 | TJ_BGR: The components of each pixel in the source image are stored in |
| 109 | B,G,R order, not R,G,B |
| 110 | TJ_BOTTOMUP: The source image is stored in bottom-up (Windows) order, |
| 111 | not top-down |
| 112 | TJ_FORCEMMX: Valid only for the Intel Performance Primitives implementation |
| 113 | of this codec-- force IPP to use MMX code (bypass CPU auto-detection) |
| 114 | TJ_FORCESSE: Valid only for the Intel Performance Primitives implementation |
| 115 | of this codec-- force IPP to use SSE code (bypass CPU auto-detection) |
| 116 | TJ_FORCESSE2: Valid only for the Intel Performance Primitives implementation |
| 117 | of this codec-- force IPP to use SSE2 code (bypass CPU auto-detection) |
| 118 | TJ_FORCESSE3: Valid only for the Intel Performance Primitives implementation |
| 119 | of this codec-- force IPP to use SSE3 code (bypass CPU auto-detection) |
| 120 | |
| 121 | RETURNS: 0 on success, -1 on error |
| 122 | */ |
| 123 | DLLEXPORT int DLLCALL tjCompress(tjhandle j, |
| 124 | unsigned char *srcbuf, int width, int pitch, int height, int pixelsize, |
| 125 | unsigned char *dstbuf, unsigned long *size, |
| 126 | int jpegsubsamp, int jpegqual, int flags); |
| 127 | |
| 128 | DLLEXPORT unsigned long DLLCALL TJBUFSIZE(int width, int height); |
| 129 | |
| 130 | /* |
| 131 | tjhandle tjInitDecompress(void) |
| 132 | |
| 133 | Creates a new JPEG decompressor instance, allocates memory for the |
| 134 | structures, and returns a handle to the instance. Most applications will |
| 135 | only need to call this once at the beginning of the program or once for each |
| 136 | concurrent thread. Don't try to create a new instance every time you |
| 137 | decompress an image, because this will cause performance to suffer. |
| 138 | |
| 139 | RETURNS: NULL on error |
| 140 | */ |
| 141 | DLLEXPORT tjhandle DLLCALL tjInitDecompress(void); |
| 142 | |
| 143 | |
| 144 | /* |
| 145 | int tjDecompressHeader(tjhandle j, |
| 146 | unsigned char *srcbuf, unsigned long size, |
| 147 | int *width, int *height) |
| 148 | |
| 149 | [INPUT] j = instance handle previously returned from a call to |
| 150 | tjInitDecompress() |
| 151 | [INPUT] srcbuf = pointer to a user-allocated buffer containing the JPEG image |
| 152 | to decompress |
| 153 | [INPUT] size = size of the JPEG image buffer (in bytes) |
| 154 | [OUTPUT] width = width (in pixels) of the JPEG image |
| 155 | [OUTPUT] height = height (in pixels) of the JPEG image |
| 156 | |
| 157 | RETURNS: 0 on success, -1 on error |
| 158 | */ |
| 159 | DLLEXPORT int DLLCALL tjDecompressHeader(tjhandle j, |
| 160 | unsigned char *srcbuf, unsigned long size, |
| 161 | int *width, int *height); |
| 162 | |
| 163 | |
| 164 | /* |
| 165 | int tjDecompress(tjhandle j, |
| 166 | unsigned char *srcbuf, unsigned long size, |
| 167 | unsigned char *dstbuf, int width, int pitch, int height, int pixelsize, |
| 168 | int flags) |
| 169 | |
| 170 | [INPUT] j = instance handle previously returned from a call to |
| 171 | tjInitDecompress() |
| 172 | [INPUT] srcbuf = pointer to a user-allocated buffer containing the JPEG image |
| 173 | to decompress |
| 174 | [INPUT] size = size of the JPEG image buffer (in bytes) |
| 175 | [INPUT] dstbuf = pointer to user-allocated image buffer which will receive |
| 176 | the bitmap image. This buffer should normally be pitch*height |
| 177 | bytes in size, although this pointer may also be used to decompress into |
| 178 | a specific region of a larger buffer. |
| 179 | [INPUT] width = width (in pixels) of the destination image |
| 180 | [INPUT] pitch = bytes per line of the destination image (width*pixelsize if the |
| 181 | bitmap is unpadded, else TJPAD(width*pixelsize) if each line of the bitmap |
| 182 | is padded to the nearest 32-bit boundary, such as is the case for Windows |
| 183 | bitmaps. You can also be clever and use this parameter to skip lines, etc., |
| 184 | as long as the pitch is greater than 0.) |
| 185 | [INPUT] height = height (in pixels) of the destination image |
| 186 | [INPUT] pixelsize = size (in bytes) of each pixel in the destination image |
| 187 | RGBA/RGBx and BGRA/BGRx: 4, RGB and BGR: 3 |
| 188 | [INPUT] flags = the bitwise OR of one or more of the following |
| 189 | |
| 190 | TJ_BGR: The components of each pixel in the destination image should be |
| 191 | written in B,G,R order, not R,G,B |
| 192 | TJ_BOTTOMUP: The destination image should be stored in bottom-up |
| 193 | (Windows) order, not top-down |
| 194 | TJ_FORCEMMX: Valid only for the Intel Performance Primitives implementation |
| 195 | of this codec-- force IPP to use MMX code (bypass CPU auto-detection) |
| 196 | TJ_FORCESSE: Valid only for the Intel Performance Primitives implementation |
| 197 | of this codec-- force IPP to use SSE code (bypass CPU auto-detection) |
| 198 | TJ_FORCESSE2: Valid only for the Intel Performance Primitives implementation |
| 199 | of this codec-- force IPP to use SSE2 code (bypass CPU auto-detection) |
| 200 | |
| 201 | RETURNS: 0 on success, -1 on error |
| 202 | */ |
| 203 | DLLEXPORT int DLLCALL tjDecompress(tjhandle j, |
| 204 | unsigned char *srcbuf, unsigned long size, |
| 205 | unsigned char *dstbuf, int width, int pitch, int height, int pixelsize, |
| 206 | int flags); |
| 207 | |
| 208 | |
| 209 | /* |
| 210 | int tjDestroy(tjhandle h) |
| 211 | |
| 212 | Frees structures associated with a compression or decompression instance |
| 213 | |
| 214 | [INPUT] h = instance handle (returned from a previous call to |
| 215 | tjInitCompress() or tjInitDecompress() |
| 216 | |
| 217 | RETURNS: 0 on success, -1 on error |
| 218 | */ |
| 219 | DLLEXPORT int DLLCALL tjDestroy(tjhandle h); |
| 220 | |
| 221 | |
| 222 | /* |
| 223 | char *tjGetErrorStr(void) |
| 224 | |
| 225 | Returns a descriptive error message explaining why the last command failed |
| 226 | */ |
| 227 | DLLEXPORT char* DLLCALL tjGetErrorStr(void); |
| 228 | |
| 229 | #ifdef __cplusplus |
| 230 | } |
| 231 | #endif |