94 lines
3.5 KiB
Plaintext
94 lines
3.5 KiB
Plaintext
#import <Flutter/Flutter.h>
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#include "ios_image_load.h"
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <stdio.h>
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#import <CoreImage/CoreImage.h>
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#import <ImageIO/ImageIO.h>
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std::vector<uint8_t> LoadImageFromFile(const char* file_name,
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int* out_width, int* out_height,
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int* out_channels) {
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FILE* file_handle = fopen(file_name, "rb");
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fseek(file_handle, 0, SEEK_END);
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const size_t bytes_in_file = ftell(file_handle);
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fseek(file_handle, 0, SEEK_SET);
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std::vector<uint8_t> file_data(bytes_in_file);
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fread(file_data.data(), 1, bytes_in_file, file_handle);
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fclose(file_handle);
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CFDataRef file_data_ref = CFDataCreateWithBytesNoCopy(NULL, file_data.data(),
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bytes_in_file,
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kCFAllocatorNull);
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CGDataProviderRef image_provider = CGDataProviderCreateWithCFData(file_data_ref);
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const char* suffix = strrchr(file_name, '.');
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if (!suffix || suffix == file_name) {
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suffix = "";
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}
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CGImageRef image;
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if (strcasecmp(suffix, ".png") == 0) {
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image = CGImageCreateWithPNGDataProvider(image_provider, NULL, true,
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kCGRenderingIntentDefault);
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} else if ((strcasecmp(suffix, ".jpg") == 0) ||
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(strcasecmp(suffix, ".jpeg") == 0)) {
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image = CGImageCreateWithJPEGDataProvider(image_provider, NULL, true,
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kCGRenderingIntentDefault);
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} else {
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CFRelease(image_provider);
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CFRelease(file_data_ref);
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fprintf(stderr, "Unknown suffix for file '%s'\n", file_name);
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out_width = 0;
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out_height = 0;
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*out_channels = 0;
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return std::vector<uint8_t>();
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}
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int width = (int)CGImageGetWidth(image);
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int height = (int)CGImageGetHeight(image);
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const int channels = 4;
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CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
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const int bytes_per_row = (width * channels);
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const int bytes_in_image = (bytes_per_row * height);
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std::vector<uint8_t> result(bytes_in_image);
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const int bits_per_component = 8;
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CGContextRef context = CGBitmapContextCreate(result.data(), width, height,
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bits_per_component, bytes_per_row, color_space,
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kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
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CGColorSpaceRelease(color_space);
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CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
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CGContextRelease(context);
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CFRelease(image);
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CFRelease(image_provider);
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CFRelease(file_data_ref);
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*out_width = width;
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*out_height = height;
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*out_channels = channels;
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return result;
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}
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NSData *CompressImage(NSMutableData *image, int width, int height, int bytesPerPixel) {
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const int channels = 4;
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CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
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CGContextRef context = CGBitmapContextCreate([image mutableBytes], width, height,
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bytesPerPixel*8, width*channels*bytesPerPixel, color_space,
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kCGImageAlphaPremultipliedLast | (bytesPerPixel == 4 ? kCGBitmapFloatComponents : kCGBitmapByteOrder32Big));
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CGColorSpaceRelease(color_space);
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if (context == nil) return nil;
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CGImageRef imgRef = CGBitmapContextCreateImage(context);
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CGContextRelease(context);
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if (imgRef == nil) return nil;
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UIImage* img = [UIImage imageWithCGImage:imgRef];
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CGImageRelease(imgRef);
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if (img == nil) return nil;
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return UIImagePNGRepresentation(img);
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}
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