- (UIImage *)getMosicaImageWithOriginal:(UIImage *)originalImage level:(NSUInteger)level {
//獲取BitmapData
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGImageRef imageRef = originalImage.CGImage;
CGFloat width = CGImageGetWidth(imageRef);
CGFloat heigth = CGImageGetHeight(imageRef);
CGImageAlphaInfo bitmapInfo = CGImageGetAlphaInfo(imageRef);
CGContextRef context = CGBitmapContextCreate(nil, width, heigth, 8, width*PerPixelChannelCount, colorSpace, bitmapInfo);
CGContextDrawImage(context, CGRectMake(0, 0, width, heigth), imageRef);
unsigned char *bitmapDatas = CGBitmapContextGetData(context);
NSUInteger index =0,perIndex=0;
unsigned char *pixel[PerPixelChannelCount] = {0};
for(int i = 0; i < width; i++){
for(int j = 0; j < heigth; j++){
index = i*width + j;
if(i%level == 0){
if(j%level == 0){
memcpy(pixel, bitmapDatas+PerPixelChannelCount*index, PerPixelChannelCount);
}else{
memcpy(bitmapDatas+PerPixelChannelCount*index, pixel, PerPixelChannelCount);
}
}else{
perIndex = (i-1)*width +j;
memcpy(bitmapDatas+PerPixelChannelCount*index, bitmapDatas+PerPixelChannelCount*perIndex, PerPixelChannelCount);
}
}
}
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, bitmapDatas, width*heigth*PerPixelChannelCount, NULL);
//創建輸出的圖像
CGImageRef mosaicImageRef = CGImageCreate(width, heigth, 8, 32, width*PerPixelChannelCount, colorSpace, kCGBitmapByteOrderDefault, provider, NULL, NO, kCGRenderingIntentDefault);
CGContextRef outputRef = CGBitmapContextCreate(nil, width, heigth, 8, width*PerPixelChannelCount, colorSpace, kCGImageAlphaPremultipliedLast);
CGContextDrawImage(outputRef, CGRectMake(0, 0, width, heigth), mosaicImageRef);
CGImageRef resultImageRef = CGBitmapContextCreateImage(outputRef);
UIImage *resultImage = nil;
if([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) {
float scale = [[UIScreen mainScreen] scale];
resultImage = [UIImage imageWithCGImage:resultImageRef scale:scale orientation:UIImageOrientationUp];
} else {
resultImage = [UIImage imageWithCGImage:resultImageRef];
}
CGContextRelease(context);
CGDataProviderRelease(provider);
CGImageRelease(mosaicImageRef);
CGImageRelease(resultImageRef);
CGContextRelease(outputRef);
CGColorSpaceRelease(colorSpace);
return resultImage;
}
iOS對圖片進行馬賽克處理
發表評論
所有評論
還沒有人評論,想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.