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15357816
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2013-03-12T09:45:01.073
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2013-03-12T09:50:47.853
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2013-03-12T09:50:47.853
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I have looked into this myself a year ago, and quickly resorted to using a black layer with transparent parts. It suited my then needs. But what you want is possible.. You want to couple one TBitmapLayer to another and consider it its mask. I want to avoid these references however (and its potential problems and Graphics32 rework) and see this only as a last resort. There is a way to do without a dedicated TBitmapLayer, using your own pixel combiner. But it doesn't know about TBitmapLayers and its XY pixels. To proper occlude (or leave out) parts of a <code>TBitmapLayer</code> while drawing to screen, you could use create a method of <a href="http://graphics32.org/documentation/Docs/Units/GR32/Types/TPixelCombineEvent.htm" rel="nofollow">type <code>TPixelCombineEvent</code></a> and assigning this as its <code>OnPixelCombine</code> and setting <code>TBitmapLayer.DrawMode</code> to <code>dmCustom</code>. Inside that <code>TPixelCombineEvent</code> method you decide what pixels result given the background <code>B</code> and the foreground <code>F</code> given the current <code>M</code> master alpha. <pre><code>procedure TMyObj.MyPixCombine(F: TColor32; var B: TColor32; M: TColor32); begin if not PseudoThisPixelShouldBeMasked then B := F; // ugly and aliased end; </code></pre> Problem here is, that (the pseudo code) PseudoThisPixelShouldBeMasked doesn't really know what pixel this concerns and whether it is inside a mask. So you'd have to extract that value from a component of <code>F</code>, such as its Alpha value. Back then i opted for the quite fast <code>B := ColorMin(F,B);</code> where F is black or white. This layer is on top always and results in black instead of transparent masks however. This because any rendering to the <code>TBitmapLayer</code> would destroy the mask data and i need to reapply it. Using a <code>TByteMap</code> however as suggested below (who downvoted that?) by iamjoosy might be interesting, perhaps that performance penalty turns out negligible.
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1. POCreating a Clipping Mask using Graphics32
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PostTypePostTypeId
1. PTAnswer
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1. USBarry Staes
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1. USBarry Staes
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