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116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/**
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This is an example how to write your own simple pngquant using libimagequant.
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libimagequant works with any PNG library. This example uses lodepng, because it's easier to use than libpng.
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To run this example, run these commands in the library directory:
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make example
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./example /path/to/some_file.png
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On "manually":
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1. Get lodepng.c (download lodepng.cpp and rename it) and lodepng.h
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from http://lodev.org/lodepng/ and put them in this directry
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2. Compile libimagequant (see README.md)
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3. Compile and run the example:
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gcc -O3 example.c libimagequant.a -o example
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./example truecolor_file.png
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This example code can be freely copied under CC0 (public domain) license.
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*/
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#include "lodepng.h" // Get it from https://raw.githubusercontent.com/lvandeve/lodepng/master/lodepng.h
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#include "lodepng.c" // Get it from https://raw.githubusercontent.com/lvandeve/lodepng/master/lodepng.cpp and rename
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#include <stdio.h>
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#include <stdlib.h>
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#include "libimagequant.h"
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int main(int argc, char *argv[]) {
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if (argc < 2) {
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fprintf(stderr, "Please specify a path to a PNG file\n");
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return EXIT_FAILURE;
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}
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const char *input_png_file_path = argv[1];
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// Load PNG file and decode it as raw RGBA pixels
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// This uses lodepng library for PNG reading (not part of libimagequant)
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unsigned int width, height;
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unsigned char *raw_rgba_pixels;
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unsigned int status = lodepng_decode32_file(&raw_rgba_pixels, &width, &height, input_png_file_path);
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if (status) {
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fprintf(stderr, "Can't load %s: %s\n", input_png_file_path, lodepng_error_text(status));
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return EXIT_FAILURE;
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}
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// Use libimagequant to make a palette for the RGBA pixels
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liq_attr *handle = liq_attr_create();
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liq_image *input_image = liq_image_create_rgba(handle, raw_rgba_pixels, width, height, 0);
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// You could set more options here, like liq_set_quality
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liq_result *quantization_result;
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if (liq_image_quantize(input_image, handle, &quantization_result) != LIQ_OK) {
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fprintf(stderr, "Quantization failed\n");
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return EXIT_FAILURE;
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}
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// Use libimagequant to make new image pixels from the palette
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size_t pixels_size = width * height;
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unsigned char *raw_8bit_pixels = malloc(pixels_size);
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liq_set_dithering_level(quantization_result, 1.0);
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liq_write_remapped_image(quantization_result, input_image, raw_8bit_pixels, pixels_size);
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const liq_palette *palette = liq_get_palette(quantization_result);
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// Save converted pixels as a PNG file
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// This uses lodepng library for PNG writing (not part of libimagequant)
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LodePNGState state;
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lodepng_state_init(&state);
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state.info_raw.colortype = LCT_PALETTE;
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state.info_raw.bitdepth = 8;
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state.info_png.color.colortype = LCT_PALETTE;
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state.info_png.color.bitdepth = 8;
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for(int i=0; i < palette->count; i++) {
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lodepng_palette_add(&state.info_png.color, palette->entries[i].r, palette->entries[i].g, palette->entries[i].b, palette->entries[i].a);
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lodepng_palette_add(&state.info_raw, palette->entries[i].r, palette->entries[i].g, palette->entries[i].b, palette->entries[i].a);
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}
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unsigned char *output_file_data;
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size_t output_file_size;
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unsigned int out_status = lodepng_encode(&output_file_data, &output_file_size, raw_8bit_pixels, width, height, &state);
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if (out_status) {
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fprintf(stderr, "Can't encode image: %s\n", lodepng_error_text(out_status));
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return EXIT_FAILURE;
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}
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const char *output_png_file_path = "quantized_example.png";
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FILE *fp = fopen(output_png_file_path, "wb");
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if (!fp) {
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fprintf(stderr, "Unable to write to %s\n", output_png_file_path);
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return EXIT_FAILURE;
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}
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fwrite(output_file_data, 1, output_file_size, fp);
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fclose(fp);
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printf("Written %s\n", output_png_file_path);
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// Done. Free memory.
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liq_result_destroy(quantization_result); // Must be freed only after you're done using the palette
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liq_image_destroy(input_image);
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liq_attr_destroy(handle);
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free(raw_8bit_pixels);
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lodepng_state_cleanup(&state);
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}
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