150 lines
4.7 KiB
C
150 lines
4.7 KiB
C
/*
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ExoQuant v0.7
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Copyright (c) 2004 Dennis Ranke
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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/******************************************************************************
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* Usage:
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* ------
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*
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* exq_data *pExq = exq_init(); // init quantizer (per image)
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* exq_feed(pExq, <ptr to image>, <num of pixels); // feed pixel data (32bpp)
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* exq_quantize(pExq, <num of colors>); // find palette
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* exq_get_palette(pExq, <ptr to buffer>, <num of colors>); // get palette
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* exq_map_image(pExq, <num of pixels>, <ptr to input>, <ptr to output>);
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* or:
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* exq_map_image_ordered(pExq, <width>, <height>, <input>, <output>);
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* // map image to palette
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* exq_free(pExq); // free memory again
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*
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* Notes:
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* ------
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*
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* All 32bpp data (input data and palette data) is considered a byte stream
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* of the format:
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* R0 G0 B0 A0 R1 G1 B1 A1 ...
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* If you want to use a different order, the easiest way to do this is to
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* change the SCALE_x constants in expquant.h, as those are the only differences
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* between the channels.
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*
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******************************************************************************/
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#ifndef __EXOQUANT_H
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#define __EXOQUANT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* type definitions */
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typedef double exq_float;
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typedef struct _exq_color
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{
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exq_float r, g, b, a;
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} exq_color;
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typedef struct _exq_histogram
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{
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exq_color color;
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unsigned char ored, ogreen, oblue, oalpha;
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int palIndex;
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exq_color ditherScale;
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int ditherIndex[4];
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int num;
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struct _exq_histogram *pNext;
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struct _exq_histogram *pNextInHash;
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} exq_histogram;
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typedef struct _exq_node
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{
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exq_color dir, avg;
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exq_float vdif;
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exq_float err;
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int num;
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exq_histogram *pHistogram;
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exq_histogram *pSplit;
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} exq_node;
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#define EXQ_HASH_BITS 16
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#define EXQ_HASH_SIZE (1 << (EXQ_HASH_BITS))
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typedef struct _exq_data
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{
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exq_histogram *pHash[EXQ_HASH_SIZE];
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exq_node node[256];
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int numColors;
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int numBitsPerChannel;
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int optimized;
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int transparency;
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} exq_data;
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/* interface */
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exq_data *exq_init();
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void exq_no_transparency(exq_data *pExq);
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void exq_free(exq_data *pExq);
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void exq_feed(exq_data *pExq, unsigned char *pData,
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int nPixels);
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void exq_quantize(exq_data *pExq, int nColors);
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void exq_quantize_hq(exq_data *pExq, int nColors);
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void exq_quantize_ex(exq_data *pExq, int nColors, int hq);
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exq_float exq_get_mean_error(exq_data *pExq);
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void exq_get_palette(exq_data *pExq, unsigned char *pPal,
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int nColors);
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void exq_set_palette(exq_data *pExq, unsigned char *pPal,
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int nColors);
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void exq_map_image(exq_data *pExq, int nPixels,
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unsigned char *pIn, unsigned char *pOut);
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void exq_map_image_ordered(exq_data *pExq, int width,
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int height, unsigned char *pIn,
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unsigned char *pOut);
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void exq_map_image_random(exq_data *pExq, int nPixels,
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unsigned char *pIn, unsigned char *pOut);
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/* internal functions */
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void exq_map_image_dither(exq_data *pExq, int width,
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int height, unsigned char *pIn,
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unsigned char *pOut, int ordered);
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void exq_sum_node(exq_node *pNode);
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void exq_optimize_palette(exq_data *pExp, int iter);
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unsigned char exq_find_nearest_color(exq_data *pExp, exq_color *pColor);
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exq_histogram *exq_find_histogram(exq_data *pExp, unsigned char *pCol);
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void exq_sort(exq_histogram **ppHist,
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exq_float (*sortfunc)(const exq_histogram *pHist));
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exq_float exq_sort_by_r(const exq_histogram *pHist);
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exq_float exq_sort_by_g(const exq_histogram *pHist);
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exq_float exq_sort_by_b(const exq_histogram *pHist);
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exq_float exq_sort_by_a(const exq_histogram *pHist);
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exq_float exq_sort_by_dir(const exq_histogram *pHist);
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extern exq_color exq_sort_dir;
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#ifdef __cplusplus
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}
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#endif
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#endif // __EXOQUANT_H
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