UIImage图片处理

来源：互联网发布：oracle 数据搜索引擎编辑：程序博客网时间：2024/06/06 01:27
#pragma mark -#pragma mark - 缩放处理+ (UIImage *)scaleImage:(UIImage *)image withScale:(float)scale{    UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scale, image.size.height * scale));        [image drawInRect:CGRectMake(0, 0, image.size.width * scale, image.size.height * scale)];    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();        return scaledImage;}+ (UIImage *)scaleImage:(UIImage *)image toSize:(CGSize)size{    UIGraphicsBeginImageContext(CGSizeMake(size.width, size.height));        [image drawInRect:CGRectMake(0, 0, size.width, size.height)];    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();        return scaledImage;}#pragma mark -#pragma mark - 马赛克处理static CGContextRef CreateRGBABitmapContext (CGImageRef inImage){    CGContextRef context = NULL;    CGColorSpaceRef colorSpace;    void *bitmapData; //内存空间的指针，该内存空间的大小等于图像使用RGB通道所占用的字节数。    int bitmapByteCount;    int bitmapBytesPerRow;        size_t pixelsWide = CGImageGetWidth(inImage); //获取横向的像素点的个数    size_t pixelsHigh = CGImageGetHeight(inImage);        bitmapBytesPerRow    = (pixelsWide * 4); //每一行的像素点占用的字节数，每个像素点的ARGB四个通道各占8个bit(0-255)的空间    bitmapByteCount    = (bitmapBytesPerRow * pixelsHigh); //计算整张图占用的字节数        colorSpace = CGColorSpaceCreateDeviceRGB();//创建依赖于设备的RGB通道    //分配足够容纳图片字节数的内存空间    bitmapData = malloc( bitmapByteCount );    //创建CoreGraphic的图形上下文，该上下文描述了bitmaData指向的内存空间需要绘制的图像的一些绘制参数    context = CGBitmapContextCreate (bitmapData,                                     pixelsWide,                                     pixelsHigh,                                     8,                                     bitmapBytesPerRow,                                     colorSpace,                                     kCGImageAlphaPremultipliedLast);    //Core Foundation中通过含有Create、Alloc的方法名字创建的指针，需要使用CFRelease()函数释放    CGColorSpaceRelease( colorSpace );    return context;}static unsigned char *RequestImagePixelData(UIImage *inImage){    CGImageRef img = [inImage CGImage];    CGSize size = [inImage size];    //使用上面的函数创建上下文    CGContextRef cgctx = CreateRGBABitmapContext(img);        CGRect rect = {{0,0},{size.width, size.height}};    //将目标图像绘制到指定的上下文，实际为上下文内的bitmapData。    CGContextDrawImage(cgctx, rect, img);    unsigned char *data = CGBitmapContextGetData (cgctx);    //释放上面的函数创建的上下文    CGContextRelease(cgctx);    return data;}+ (UIImage *)mosaicImage:(UIImage *)image withLevel:(int)level{    unsigned char *imgPixel = RequestImagePixelData(image);    CGImageRef inImageRef = [image CGImage];    GLuint width = CGImageGetWidth(inImageRef);    GLuint height = CGImageGetHeight(inImageRef);    unsigned char prev[4] = {0};    int bytewidth = width*4;    int i,j;    int val = level;    for(i=0;i<height;i++) {        if (((i+1)%val) == 0) {            memcpy(imgPixel+bytewidth*i, imgPixel+bytewidth*(i-1), bytewidth);            continue;        }        for(j=0;j<width;j++) {            if (((j+1)%val) == 1) {                memcpy(prev, imgPixel+bytewidth*i+j*4, 4);                continue;            }            memcpy(imgPixel+bytewidth*i+j*4, prev, 4);        }    }    NSInteger dataLength = width*height* 4;        //下面的代码创建要输出的图像的相关参数    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, imgPixel, dataLength, NULL);    // prep the ingredients    int bitsPerComponent = 8;    int bitsPerPixel = 32;    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();    CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;    CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;    //创建要输出的图像    CGImageRef imageRef = CGImageCreate(width, height,                                        bitsPerComponent,                                        bitsPerPixel,                                        bytewidth,                                        colorSpaceRef,                                        bitmapInfo,                                        provider,                                        NULL, NO, renderingIntent);    UIImage *mosaicImage = [UIImage imageWithCGImage:imageRef scale:image.scale orientation:image.imageOrientation];    CFRelease(imageRef);    CGColorSpaceRelease(colorSpaceRef);    CGDataProviderRelease(provider);    return mosaicImage;}#define kBitsPerComponent (8)#define kBitsPerPixel (32)#define kPixelChannelCount (4)/* *转换成马赛克,level代表一个点转为多少level*level的正方形 */+ (UIImage *)transToMosaicImage:(UIImage*)orginImage blockLevel:(NSUInteger)level{    //获取BitmapData    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    CGImageRef imgRef = orginImage.CGImage;    CGFloat width = CGImageGetWidth(imgRef);    CGFloat height = CGImageGetHeight(imgRef);    CGContextRef context = CGBitmapContextCreate (nil,                                                  width,                                                  height,                                                  kBitsPerComponent,        //每个颜色值8bit                                                  width*kPixelChannelCount, //每一行的像素点占用的字节数，每个像素点的ARGB四个通道各占8个bit                                                  colorSpace,                                                  kCGImageAlphaPremultipliedLast);    CGContextDrawImage(context, CGRectMake(0, 0, width, height), imgRef);    unsigned char *bitmapData = CGBitmapContextGetData (context);        //这里把BitmapData进行马赛克转换,就是用一个点的颜色填充一个level*level的正方形    unsigned char pixel[kPixelChannelCount] = {0};    NSUInteger index,preIndex;    for (NSUInteger i = 0; i < height - 1 ; i++) {        for (NSUInteger j = 0; j < width - 1; j++) {            index = i * width + j;            if (i % level == 0) {                if (j % level == 0) {                    memcpy(pixel, bitmapData + kPixelChannelCount*index, kPixelChannelCount);                }else{                    memcpy(bitmapData + kPixelChannelCount*index, pixel, kPixelChannelCount);                }            } else {                preIndex = (i-1)*width +j;                memcpy(bitmapData + kPixelChannelCount*index, bitmapData + kPixelChannelCount*preIndex, kPixelChannelCount);            }        }    }        NSInteger dataLength = width*height* kPixelChannelCount;    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, bitmapData, dataLength, NULL);    //创建要输出的图像    CGImageRef mosaicImageRef = CGImageCreate(width, height,                                              kBitsPerComponent,                                              kBitsPerPixel,                                              width*kPixelChannelCount ,                                              colorSpace,                                              kCGImageAlphaPremultipliedLast,                                              provider,                                              NULL, NO,                                              kCGRenderingIntentDefault);    CGContextRef outputContext = CGBitmapContextCreate(nil,                                                       width,                                                       height,                                                       kBitsPerComponent,                                                       width*kPixelChannelCount,                                                       colorSpace,                                                       kCGImageAlphaPremultipliedLast);    CGContextDrawImage(outputContext, CGRectMake(0.0f, 0.0f, width, height), mosaicImageRef);    CGImageRef resultImageRef = CGBitmapContextCreateImage(outputContext);    UIImage *resultImage = nil;    if([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) {//        float scale = [[UIScreen mainScreen] scale];//        resultImage = [UIImage imageWithCGImage:resultImageRef scale:scale orientation:UIImageOrientationUp];        resultImage = [UIImage imageWithCGImage:resultImageRef scale:orginImage.scale orientation:orginImage.imageOrientation];    } else {        resultImage = [UIImage imageWithCGImage:resultImageRef];    }    //释放    if(resultImageRef){        CFRelease(resultImageRef);    }    if(mosaicImageRef){        CFRelease(mosaicImageRef);    }    if(colorSpace){        CGColorSpaceRelease(colorSpace);    }    if(provider){        CGDataProviderRelease(provider);    }    if(context){        CGContextRelease(context);    }    if(outputContext){        CGContextRelease(outputContext);    }//    return [[resultImage retain] autorelease];    return resultImage;    }
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