OS 图片压缩器 输出不同分辨率图片

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https://github.com/KillWilde/CYImageCompressor

主要代码

#pragma mark 压缩图片到对应尺寸

-(NSImage *)compressImage:(NSImage *)sourceImg withSize:(CGSize)size

{

    // convert NSImage to bitmap

    NSData  * tiffData = [sourceImg TIFFRepresentation];

    NSBitmapImageRep * bitmap;

    bitmap = [NSBitmapImageRep imageRepWithData:tiffData];

    

    // create CIImage from bitmap

    CIImage * ciImage = [[CIImage alloc] initWithBitmapImageRep:bitmap];

    

    float width = CGImageGetWidth(ciImage.CGImage);

    float height = CGImageGetHeight(ciImage.CGImage);

    CGImageRef ref = CGImageCreateWithImageInRect(ciImage.CGImage, CGRectMake(0, 0, width, height));

    

    NSRect imageRect = NSMakeRect(0.0, 0.0, size.width, size.height);

    CGContextRef imageContext = nil;

    NSImage* newImage = nil;

    

    // Create a new image to receive the Quartz image data.

    newImage = [[NSImage alloc] initWithSize:imageRect.size];

    [newImage lockFocus];

    

    // Get the Quartz context and draw.

    imageContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];

    CGContextDrawImage(imageContext, *(CGRect*)&imageRect, ref);

    [newImage unlockFocus];

    

    return newImage;

}

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