74 lines
2.1 KiB
Mathematica
74 lines
2.1 KiB
Mathematica
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// rwpng_cocoa.m
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// pngquant
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//
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#include "rwpng.h"
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#ifdef USE_COCOA
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#import <Cocoa/Cocoa.h>
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#import <CoreGraphics/CoreGraphics.h>
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#include <stdio.h>
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#include "lib/libimagequant.h"
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#include "lib/pam.h"
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int rwpng_read_image24_cocoa(FILE *fp, png24_image *out)
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{
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rgba_pixel *pixel_data;
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int width, height;
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@autoreleasepool {
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NSFileHandle *fh = [[NSFileHandle alloc] initWithFileDescriptor:fileno(fp)];
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NSData *data = [fh readDataToEndOfFile];
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out->file_size = [data length];
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CGImageRef image = [[NSBitmapImageRep imageRepWithData:data] CGImage];
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[fh release];
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if (!image) return READ_ERROR;
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width = CGImageGetWidth(image);
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height = CGImageGetHeight(image);
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pixel_data = calloc(width*height,4);
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CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
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CGContextRef context = CGBitmapContextCreate(pixel_data,
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width, height,
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8, width*4,
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colorspace,
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kCGImageAlphaPremultipliedLast);
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CGColorSpaceRelease(colorspace);
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if (!context) return READ_ERROR;
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CGContextDrawImage(context, CGRectMake(0.0, 0.0, width, height), image);
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CGContextRelease(context);
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}
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// reverse premultiplication
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for(int i=0; i < width*height; i++) {
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if (pixel_data[i].a) {
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pixel_data[i] = (rgba_pixel){
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.a = pixel_data[i].a,
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.r = pixel_data[i].r*255/pixel_data[i].a,
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.g = pixel_data[i].g*255/pixel_data[i].a,
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.b = pixel_data[i].b*255/pixel_data[i].a,
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};
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}
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}
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out->gamma = 0.45455;
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out->width = width;
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out->height = height;
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out->rgba_data = (unsigned char *)pixel_data;
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out->row_pointers = malloc(sizeof(out->row_pointers[0])*out->height);
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for(int i=0; i < out->height; i++) {
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out->row_pointers[i] = (unsigned char *)&pixel_data[width*i];
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}
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return SUCCESS;
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}
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#endif
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