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最新推荐文章于 2023-12-20 20:45:01 发布

原创最新推荐文章于 2023-12-20 20:45:01 发布 · 549 阅读

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- (UIImage*)applyFilter:(FilterFunction)filter context:(void*)context
{
    CGImageRef inImage = self.CGImage;
    CFDataRef m_DataRef = CGDataProviderCopyData(CGImageGetDataProvider(inImage));
    UInt8 *m_PixelBuf = (UInt8 *)CFDataGetBytePtr(m_DataRef);

    int length = CFDataGetLength(m_DataRef);

    for (int i=0; i<length; i+=4) {
        filter(m_PixelBuf, i, context);
    }

    CGContextRef ctx = CGBitmapContextCreate(m_PixelBuf,
                                             CGImageGetWidth(inImage),
                                             CGImageGetHeight(inImage),
                                             CGImageGetBitsPerComponent(inImage),
                                             CGImageGetBytesPerRow(inImage),
                                             CGImageGetColorSpace(inImage),
                                             CGImageGetBitmapInfo(inImage)
                                             );

    CGImageRef imageRef = CGBitmapContextCreateImage(ctx);
    CGContextRelease(ctx);
    UIImage *finalImage = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);
    CFRelease(m_DataRef);

    return finalImage;
}