mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-05 13:33:33 +01:00
116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
|
/**
|
||
|
|
||
|
This is an example how to write your own simple pngquant using libimagequant.
|
||
|
|
||
|
libimagequant works with any PNG library. This example uses lodepng, because it's easier to use than libpng.
|
||
|
|
||
|
To run this example, run these commands in the library directory:
|
||
|
|
||
|
make example
|
||
|
./example /path/to/some_file.png
|
||
|
|
||
|
On "manually":
|
||
|
|
||
|
1. Get lodepng.c (download lodepng.cpp and rename it) and lodepng.h
|
||
|
from http://lodev.org/lodepng/ and put them in this directry
|
||
|
|
||
|
2. Compile libimagequant (see README.md)
|
||
|
|
||
|
3. Compile and run the example:
|
||
|
|
||
|
gcc -O3 example.c libimagequant.a -o example
|
||
|
./example truecolor_file.png
|
||
|
|
||
|
|
||
|
This example code can be freely copied under CC0 (public domain) license.
|
||
|
*/
|
||
|
|
||
|
#include "lodepng.h" // Get it from https://raw.githubusercontent.com/lvandeve/lodepng/master/lodepng.h
|
||
|
#include "lodepng.c" // Get it from https://raw.githubusercontent.com/lvandeve/lodepng/master/lodepng.cpp and rename
|
||
|
#include <stdio.h>
|
||
|
#include <stdlib.h>
|
||
|
#include "libimagequant.h"
|
||
|
|
||
|
int main(int argc, char *argv[]) {
|
||
|
if (argc < 2) {
|
||
|
fprintf(stderr, "Please specify a path to a PNG file\n");
|
||
|
return EXIT_FAILURE;
|
||
|
}
|
||
|
|
||
|
const char *input_png_file_path = argv[1];
|
||
|
|
||
|
// Load PNG file and decode it as raw RGBA pixels
|
||
|
// This uses lodepng library for PNG reading (not part of libimagequant)
|
||
|
|
||
|
unsigned int width, height;
|
||
|
unsigned char *raw_rgba_pixels;
|
||
|
unsigned int status = lodepng_decode32_file(&raw_rgba_pixels, &width, &height, input_png_file_path);
|
||
|
if (status) {
|
||
|
fprintf(stderr, "Can't load %s: %s\n", input_png_file_path, lodepng_error_text(status));
|
||
|
return EXIT_FAILURE;
|
||
|
}
|
||
|
|
||
|
// Use libimagequant to make a palette for the RGBA pixels
|
||
|
|
||
|
liq_attr *handle = liq_attr_create();
|
||
|
liq_image *input_image = liq_image_create_rgba(handle, raw_rgba_pixels, width, height, 0);
|
||
|
// You could set more options here, like liq_set_quality
|
||
|
liq_result *quantization_result;
|
||
|
if (liq_image_quantize(input_image, handle, &quantization_result) != LIQ_OK) {
|
||
|
fprintf(stderr, "Quantization failed\n");
|
||
|
return EXIT_FAILURE;
|
||
|
}
|
||
|
|
||
|
// Use libimagequant to make new image pixels from the palette
|
||
|
|
||
|
size_t pixels_size = width * height;
|
||
|
unsigned char *raw_8bit_pixels = malloc(pixels_size);
|
||
|
liq_set_dithering_level(quantization_result, 1.0);
|
||
|
|
||
|
liq_write_remapped_image(quantization_result, input_image, raw_8bit_pixels, pixels_size);
|
||
|
const liq_palette *palette = liq_get_palette(quantization_result);
|
||
|
|
||
|
// Save converted pixels as a PNG file
|
||
|
// This uses lodepng library for PNG writing (not part of libimagequant)
|
||
|
|
||
|
LodePNGState state;
|
||
|
lodepng_state_init(&state);
|
||
|
state.info_raw.colortype = LCT_PALETTE;
|
||
|
state.info_raw.bitdepth = 8;
|
||
|
state.info_png.color.colortype = LCT_PALETTE;
|
||
|
state.info_png.color.bitdepth = 8;
|
||
|
|
||
|
for(int i=0; i < palette->count; i++) {
|
||
|
lodepng_palette_add(&state.info_png.color, palette->entries[i].r, palette->entries[i].g, palette->entries[i].b, palette->entries[i].a);
|
||
|
lodepng_palette_add(&state.info_raw, palette->entries[i].r, palette->entries[i].g, palette->entries[i].b, palette->entries[i].a);
|
||
|
}
|
||
|
|
||
|
unsigned char *output_file_data;
|
||
|
size_t output_file_size;
|
||
|
unsigned int out_status = lodepng_encode(&output_file_data, &output_file_size, raw_8bit_pixels, width, height, &state);
|
||
|
if (out_status) {
|
||
|
fprintf(stderr, "Can't encode image: %s\n", lodepng_error_text(out_status));
|
||
|
return EXIT_FAILURE;
|
||
|
}
|
||
|
|
||
|
const char *output_png_file_path = "quantized_example.png";
|
||
|
FILE *fp = fopen(output_png_file_path, "wb");
|
||
|
if (!fp) {
|
||
|
fprintf(stderr, "Unable to write to %s\n", output_png_file_path);
|
||
|
return EXIT_FAILURE;
|
||
|
}
|
||
|
fwrite(output_file_data, 1, output_file_size, fp);
|
||
|
fclose(fp);
|
||
|
|
||
|
printf("Written %s\n", output_png_file_path);
|
||
|
|
||
|
// Done. Free memory.
|
||
|
|
||
|
liq_result_destroy(quantization_result); // Must be freed only after you're done using the palette
|
||
|
liq_image_destroy(input_image);
|
||
|
liq_attr_destroy(handle);
|
||
|
|
||
|
free(raw_8bit_pixels);
|
||
|
lodepng_state_cleanup(&state);
|
||
|
}
|