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108 lines
4.1 KiB
Objective-C
108 lines
4.1 KiB
Objective-C
//
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// PNG8Image.m
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// Clover
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//
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// Created by vector sigma on 07/03/2020.
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// Copyright © 2020 CloverHackyColor. All rights reserved.
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//
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#import "PNG8Image.h"
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@implementation PNG8Image
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- (nullable NSData *)png8ImageDataAtPath:(NSString *_Nonnull)imagePath
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error:(NSError *_Nullable*_Nullable)errorPtr {
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NSString *domain = @"org.slice.Clover.PNG8Image.Error";
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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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const char *input_png_file_path = [imagePath UTF8String];
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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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NSString *desc = [NSString stringWithFormat:@"Can't load %s: %s\n",
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input_png_file_path,
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lodepng_error_text(status)];
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NSDictionary *userInfo = @{ NSLocalizedDescriptionKey : desc };
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*errorPtr = [NSError errorWithDomain:domain
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code:1
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userInfo:userInfo];
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return nil;
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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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NSString *desc = @"Quantization failed\n";
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NSDictionary *userInfo = @{ NSLocalizedDescriptionKey : desc };
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*errorPtr = [NSError errorWithDomain:domain
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code:2
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userInfo:userInfo];
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return nil;
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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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NSString *desc = [NSString stringWithFormat:@"Can't encode image: %s\n",
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lodepng_error_text(out_status)];
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NSDictionary *userInfo = @{ NSLocalizedDescriptionKey : desc };
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*errorPtr = [NSError errorWithDomain:domain
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code:3
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userInfo:userInfo];
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return nil;
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}
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NSData *data = [NSData dataWithBytes: output_file_data length: output_file_size];
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NSImage *convertedImage = [[NSImage alloc] initWithData:data];
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if (convertedImage == nil) {
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NSString *desc = @"Can't convert data to NSImage\n";
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NSDictionary *userInfo = @{ NSLocalizedDescriptionKey : desc };
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*errorPtr = [NSError errorWithDomain:domain
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code:4
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userInfo:userInfo];
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return nil;
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}
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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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return data;
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}
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@end
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