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Author Topic: bitmap masking  (Read 2155 times)

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Offline Yeong

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bitmap masking
« on: March 17, 2012, 01:53:31 pm »
How do I do custom-sized bitmap masking?
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Offline Deep Toaster

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Re: bitmap masking
« Reply #1 on: March 17, 2012, 02:56:38 pm »
You could first draw a masking bitmap with OR logic (mode 0), and then draw the graphics bitmap with XOR logic (mode 1). Any bit that's set in both bitmaps will show up white, any bit that's set in the first and not in the second will show up black, and any bit that isn't set in either is "transparent."
« Last Edit: March 17, 2012, 02:57:28 pm by Deep Thought »
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Offline Yeong

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Re: bitmap masking
« Reply #2 on: March 17, 2012, 03:03:22 pm »
hmm...
can you explain it bit more? :D
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