cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   pcman
   Member

   Hi,

   Can you please help me? I do not understand why following code does not work on iPhone
   but works on the simulator. On the iPhone the image is not masked.

   UIImage *puzzleUIImage = [UIImage imageNamed:@"Default.png"];
   UIImage *maskUIImage = [UIImage imageNamed:@"1-1.png"];
   
   CGImageRef puzzlePartImage = [ImageEditor maskImageRef:puzzleUIImage.CGImage withMask:maskUIImage.CGImage];
   PuzzlePartSprite *sprite = [PuzzlePartSprite spriteWithCGImage:puzzlePartImage];
   
   +(CGImageRef)maskImageRef:(CGImageRef)image withMask:(CGImageRef)maskImage
   {
   	CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskImage), CGImageGetHeight(maskImage), CGImageGetBitsPerComponent(maskImage), CGImageGetBitsPerPixel(maskImage), CGImageGetBytesPerRow(maskImage), CGImageGetDataProvider(maskImage), NULL, false);
   	CGImageRef masked = CGImageCreateWithMask(image, mask); // the owner releases the image
   	CGImageRelease(mask);
   
   	return masked;
   }

   Thanks

   Posted 1 year ago #
2. 

   pcman
   Member

   Hi again,

   These are my first lines of code using iPhone/cocos2d. I am stuck here and it's really
   frustrating. Can somebody give me a hint how to move further or what to check?
   It could be a problem with the images, or with my code... or something else?

   Thank you

   Posted 1 year ago #
3. 

   Steve Oldmeadow
   Administrator

   It could be something to do with pre-multiplied alpha. Try changing the "Compress PNG Files" option to No in the build settings.

   Posted 1 year ago #
4. 

   pcman
   Member

   Thanks a lot. I just wait to go home to try this.
   You gave me a hope :-)

   Posted 1 year ago #
5. 

   pcman
   Member

   I found the problem. Thanks @Steve: you moved my attention from the code to the png and here is the problem.
   I had a problem with the mask png. After I removed the "Alpha channel" using Gimp it worked on the device too.
   Changing "Compress PNG Files" did not helped.

   For me it's still strange why it worked in the simulator.
   I also need to reconsider how mask work. I thought the idea is too use the png transparency (alpha channel) but seems that I am wrong.

   Posted 1 year ago #

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