test.c

#undef NDEBUG
#include <assert.h>
#include "../lib/libimagequant.h"
#include <stdio.h>

static void test_fixed_colors() {
    liq_attr *attr = liq_attr_create();

    unsigned char dummy[4] = {0};
    liq_image *img = liq_image_create_rgba(attr, dummy, 1, 1, 0);
    assert(img);

    liq_image_add_fixed_color(img, (liq_color){0,0,0,0});

    liq_result *res = liq_quantize_image(attr, img);
    assert(res);

    const liq_palette *pal = liq_get_palette(res);
    assert(pal);
    assert(pal->count == 1);

    liq_result_destroy(res);
    liq_image_destroy(img);
    liq_attr_destroy(attr);
}

static void test_fixed_colors_order() {
    liq_attr *attr = liq_attr_create();

    unsigned char dummy[4] = {0};
    liq_image *img = liq_image_create_rgba(attr, dummy, 1, 1, 0);
    assert(img);

    liq_color colors[17] = {
        {0,0,0,0}, {1,1,1,1}, {2,2,2,2}, {3,3,3,3}, {4,4,4,4}, {5,4,4,4},
        {6,4,4,4}, {6,7,4,4}, {6,7,8,4}, {6,7,8,9}, {10,7,8,9}, {10,11,8,9},
        {10,11,12,9}, {10,11,12,13}, {14,11,12,13}, {14,15,12,13}, {14,15,16,13},
    };

    for(int i=0; i < 17; i++) {
        liq_image_add_fixed_color(img, colors[i]);
    }

    liq_result *res = liq_quantize_image(attr, img);
    assert(res);

    const liq_palette *pal = liq_get_palette(res);
    assert(pal);
    assert(pal->count == 17);

    for(int i=0; i < 17; i++) {
        assert(pal->entries[i].r == colors[i].r);
        assert(pal->entries[i].g == colors[i].g);
        assert(pal->entries[i].b == colors[i].b);
        assert(pal->entries[i].a == colors[i].a);
    }

    liq_result_destroy(res);
    liq_image_destroy(img);
    liq_attr_destroy(attr);
}

int main(void) {
    test_fixed_colors();
    test_fixed_colors_order();
    assert(printf("OK\n"));
    return 0;
}