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https://github.com/python-pillow/Pillow.git
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111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/*
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* The Python Imaging Library
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* $Id$
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*
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* quantization using libimagequant, a part of pngquant.
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*
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* Copyright (c) 2016 Marcin Kurczewski <rr-@sakuya.pl>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "QuantPngQuant.h"
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#ifdef HAVE_LIBIMAGEQUANT
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#include "libimagequant.h"
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int
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quantize_pngquant(
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Pixel *pixelData,
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int width,
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int height,
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uint32_t quantPixels,
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Pixel **palette,
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uint32_t *paletteLength,
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uint32_t **quantizedPixels,
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int withAlpha)
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{
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int result = 0;
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liq_image *image = NULL;
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liq_attr *attr = NULL;
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liq_result *remap = NULL;
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unsigned char *charMatrix = NULL;
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unsigned char **charMatrixRows = NULL;
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unsigned int i, y;
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*palette = NULL;
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*paletteLength = 0;
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*quantizedPixels = NULL;
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/* configure pngquant */
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attr = liq_attr_create();
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if (!attr) { goto err; }
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if (quantPixels) {
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liq_set_max_colors(attr, quantPixels);
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}
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/* prepare input image */
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image = liq_image_create_rgba(
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attr,
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pixelData,
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width,
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height,
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0.45455 /* gamma */);
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if (!image) { goto err; }
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/* quantize the image */
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remap = liq_quantize_image(attr, image);
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if (!remap) { goto err; }
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liq_set_output_gamma(remap, 0.45455);
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liq_set_dithering_level(remap, 1);
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/* write output palette */
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const liq_palette *l_palette = liq_get_palette(remap);
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*paletteLength = l_palette->count;
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*palette = malloc(sizeof(Pixel) * l_palette->count);
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if (!*palette) { goto err; }
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for (i = 0; i < l_palette->count; i++) {
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(*palette)[i].c.b = l_palette->entries[i].b;
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(*palette)[i].c.g = l_palette->entries[i].g;
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(*palette)[i].c.r = l_palette->entries[i].r;
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(*palette)[i].c.a = l_palette->entries[i].a;
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}
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/* write output pixels (pngquant uses char array) */
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charMatrix = malloc(width * height);
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if (!charMatrix) { goto err; }
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charMatrixRows = malloc(height * sizeof(unsigned char*));
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if (!charMatrixRows) { goto err; }
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for (y = 0; y < height; y++) {
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charMatrixRows[y] = &charMatrix[y * width];
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}
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if (LIQ_OK != liq_write_remapped_image_rows(remap, image, charMatrixRows)) {
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goto err;
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}
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/* transcribe output pixels (pillow uses uint32_t array) */
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*quantizedPixels = malloc(sizeof(uint32_t) * width * height);
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if (!*quantizedPixels) { goto err; }
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for (i = 0; i < width * height; i++) {
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(*quantizedPixels)[i] = charMatrix[i];
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}
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result = 1;
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err:
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if (attr) liq_attr_destroy(attr);
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if (image) liq_image_destroy(image);
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if (remap) liq_result_destroy(remap);
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free(charMatrix);
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free(charMatrixRows);
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if (!result) {
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free(*quantizedPixels);
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free(*palette);
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}
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return result;
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}
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#endif
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