forked from external-repos/squoosh
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
#include "emscripten.h"
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#include <stdlib.h>
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#include <inttypes.h>
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#include "libimagequant.h"
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EMSCRIPTEN_KEEPALIVE
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int version() {
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return (((LIQ_VERSION/10000) % 100) << 16) |
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(((LIQ_VERSION/100 ) % 100) << 8) |
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(((LIQ_VERSION/1 ) % 100) << 0);
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}
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EMSCRIPTEN_KEEPALIVE
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uint8_t* create_buffer(int width, int height) {
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return malloc(width * height * 4 * sizeof(uint8_t));
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}
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EMSCRIPTEN_KEEPALIVE
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void destroy_buffer(uint8_t* p) {
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free(p);
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}
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liq_attr *attr;
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liq_image *image;
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liq_result *res;
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int result[2];
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EMSCRIPTEN_KEEPALIVE
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void quantize(uint8_t* image_buffer, int image_width, int image_height, int num_colors, float dithering) {
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int size = image_width * image_height;
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attr = liq_attr_create();
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image = liq_image_create_rgba(attr, image_buffer, image_width, image_height, 0);
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liq_set_max_colors(attr, 16);
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liq_image_quantize(image, attr, &res);
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liq_set_dithering_level(res, dithering);
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uint8_t* image8bit = (uint8_t*) malloc(size);
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result[0] = (int) malloc(size * 4);
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liq_write_remapped_image(res, image, image8bit, size);
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const liq_palette *pal = liq_get_palette(res);
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// Turn palletted image back into an RGBA image
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for(int i = 0; i < size; i++) {
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((uint8_t*)result[0])[i * 4 + 0] = pal->entries[image8bit[i]].r;
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((uint8_t*)result[0])[i * 4 + 1] = pal->entries[image8bit[i]].g;
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((uint8_t*)result[0])[i * 4 + 2] = pal->entries[image8bit[i]].b;
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((uint8_t*)result[0])[i * 4 + 3] = pal->entries[image8bit[i]].a;
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}
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free(image8bit);
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liq_result_destroy(res);
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liq_image_destroy(image);
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liq_attr_destroy(attr);
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}
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EMSCRIPTEN_KEEPALIVE
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void free_result() {
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free(result[0]);
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}
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EMSCRIPTEN_KEEPALIVE
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int get_result_pointer() {
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return result[0];
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}
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EMSCRIPTEN_KEEPALIVE
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int get_result_palette_pointer() {
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return result[1];
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}
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