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Trying to create a 32 bpc NSBitmapImageRep, getting hit with errors


Trying to create a 32 bpc NSBitmapImageRep, getting hit with errors

By : user2956052
Date : November 22 2020, 10:48 AM
this will help You are trying to assign 32 bitsPerSample which is out of the range specified in the docs:
bps
code :


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How do I create an 8-bit PNG with transparency from an NSBitmapImageRep?

How do I create an 8-bit PNG with transparency from an NSBitmapImageRep?


By : user1807952
Date : March 29 2020, 07:55 AM
hop of those help? pngnq (and new pngquant which achieves higher quality) has BSD-style license, so you can just include it in your program. No need to spawn as separate task.
NSBitmapImageRep bug

NSBitmapImageRep bug


By : Rajendra
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I do not know what you want to achieve; only a copy of an existing image? Is a [image copy] not good enough? Besides this your code has at least two big bugs: you have to make a clear difference between the properties of an image and how these properties are stored. You forgot padding bytes, which may exist or not exist. This changed often from one OSX version to the next OSX version. So in your source image the number of samples per pixel is 3, but they are stored in 4 bytes (reason: storage access optimization). And therefore bitsPerPixel: 8*3 is wrong and so is bytesPerRow. So your source image has 1600 bytes per row and each pixel is stored in 32 bits (== 1 padding byte). You have to feed the new NSBitmapImageRep with exactly the same (buffer-)parameters as of the source imageRep. This means: the last two parameters (creating a new rep) should be:
code :
bytesPerRow: [image bytesPerRow]
bitsPerPixel: [image bitsPerPixel]
How to create NSBitmapImageRep from scratch?

How to create NSBitmapImageRep from scratch?


By : Damhaet
Date : March 29 2020, 07:55 AM
I wish this help you Any particular reason you're not simply creating a new NSImage and drawing into it by bracketing your drawing code with focus locking like
code :
NSImage* anImage = [[NSImage alloc] initWithSize:NSMakeSize(100.0,  100.0)];
[anImage lockFocus];

// Do your drawing here...

[anImage unlockFocus];
Can't create an NSBitmapImageRep in Swift

Can't create an NSBitmapImageRep in Swift


By : yaman patel
Date : March 29 2020, 07:55 AM
it fixes the issue The error is actually fairly descriptive - you're providing an inconsistent set of values to the initializer. Specifically, the samplesPerPixel value of 1 can't support a RGB color space, which you specify in colorSpaceName. From here:
code :
var blub = NSBitmapImageRep(bitmapDataPlanes: nil,
    pixelsWide: Int(100),
    pixelsHigh: Int(100),
    bitsPerSample: 8,
    samplesPerPixel: 3,
    hasAlpha: false,
    isPlanar: false,
    colorSpaceName: NSCalibratedRGBColorSpace,
    bytesPerRow: 0, bitsPerPixel: 0)!
How to create a CGImageRef from a NSBitmapImageRep?

How to create a CGImageRef from a NSBitmapImageRep?


By : user2867042
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further How can I create a CGImageRef from a NSBitmapImageRep? Or how can I define a complete new CGImageRef in the same way as the NSBitmapImageRep? The definition of a NSBitmapImageRep works fine. But I need an image as CGImageRef. , The easy way is by using the CGImage property (introduced in 10.5):
code :
CGImageRef image = imageRep.CGImage;
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