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This thread is locked; no one can reply to it.
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| [A5] How to remove a pixel / paint with transparent color? |
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TeaRDoWN
Member #8,518
April 2007
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Say that I have a transparent bitmap 3x3 pixels. Now say that I fill all pixels with red color (255,255,255,255). Finally say that I want the middle pixel (1,1) to be transparent. I cannot paint (0,0,0,0) since that is invisble paint and the result will still be red in that middle pixel. Is there a way of removing a pixel restoring the transparent pixel which was there before I painted the red color? |
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weapon_S
Member #7,859
October 2006
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Set the blender to ignore alpha. Putpixel will work too. (You'd have to call put blended pixel to use the alpha channel.) |
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TeaRDoWN
Member #8,518
April 2007
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Funny thing just after posting I remembered that command and was going to tested that when I had time. So al_put_pixel put a pixel with THAT color in the bitmap at x,y no matter what color is currently at x,y? |
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