Databases
StackOverflow2013
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PONSImage to NSBitmapImageRep
 

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  1. PONSImage to NSBitmapImageRep
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    <p>How to convert NSImage to NSBitmapImageRep? I have code:</p> <pre><code>- (NSBitmapImageRep *)bitmapImageRepresentation { NSBitmapImageRep *ret = (NSBitmapImageRep *)[self representations]; if(![ret isKindOfClass:[NSBitmapImageRep class]]) { ret = nil; for(NSBitmapImageRep *rep in [self representations]) if([rep isKindOfClass:[NSBitmapImageRep class]]) { ret = rep; break; } } if(ret == nil) { NSSize size = [self size]; size_t width = size.width; size_t height = size.height; size_t bitsPerComp = 32; size_t bytesPerPixel = (bitsPerComp / CHAR_BIT) * 4; size_t bytesPerRow = bytesPerPixel * width; size_t totalBytes = height * bytesPerRow; NSMutableData *data = [NSMutableData dataWithBytesNoCopy:calloc(totalBytes, 1) length:totalBytes freeWhenDone:YES]; CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB); CGContextRef ctx = CGBitmapContextCreate([data mutableBytes], width, height, bitsPerComp, bytesPerRow, CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB), kCGBitmapFloatComponents | kCGImageAlphaPremultipliedLast); if(ctx != NULL) { [NSGraphicsContext saveGraphicsState]; [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithGraphicsPort:ctx flipped:[self isFlipped]]]; [self drawAtPoint:NSZeroPoint fromRect:NSZeroRect operation:NSCompositeCopy fraction:1.0]; [NSGraphicsContext restoreGraphicsState]; CGImageRef img = CGBitmapContextCreateImage(ctx); ret = [[NSBitmapImageRep alloc] initWithCGImage:img]; [self addRepresentation:ret]; CFRelease(img); CFRelease(space); CGContextRelease(ctx); } } return ret; } </code></pre> <p>It works, but it causes memory leaks. At least when I am using it with ARC. Using <code>initWithData:[nsimagename TIFFRepresentation]</code> it not working correctly. Some images`s representations are not good. I think it depends on format and colorspace of image. Is there any other ways to achieve that?</p> <hr> <p>Result with <strong><em>mrwalker</em></strong> suggested solution:</p> <p>Original image:<br> <img src="https://i.stack.imgur.com/q8thT.png" alt="enter image description here"></p> <p>Converted to bitmapimagerep and back to image 1 time:<br> <img src="https://i.stack.imgur.com/5JT5l.png" alt="enter image description here"></p> <p>Converted to bitmapimagerep and back to image 3 times:<br> <img src="https://i.stack.imgur.com/VnMOc.png" alt="enter image description here"></p> <p>As you see image gets darker every time after converting to NSBitmapImageRep</p>
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