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AppGameKit Classic Chat / [BUG] SetImageMask fails when destination image doesn't have an alpha mask (Bump)

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blink0k
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11
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Joined: 22nd Feb 2013
Location: the land of oz
Posted: 13th Oct 2017 03:13
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These two images are exactly the same except the one on the left had an alpha mask BEFORE SetImageMask() was applied to it.

The one on the right had no mask BEFORE SetImageMask() was applied to it. Which causes SetImageMask() to fail.

This makes the mask function a ineffective because i cannot use a mask with anything from my camera roll (Or an image that does not have a mask)




See the attached project for more detail.

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Paul Johnston
TGC Developer
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Joined: 16th Nov 2002
Location: United Kingdom
Posted: 14th Oct 2017 01:57
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You need to use SetSpriteTransparency(ID,1) on the second sprite. When the image was loaded it had no alpha so would have been marked as an opaque image. Therefore sprites that use it will be opaque by default for better performance. The SetSpriteTransparency command overrides this to say you definitely want to use alpha transparency on it.
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blink0k
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Joined: 22nd Feb 2013
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Posted: 14th Oct 2017 02:16
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Ah! Ok. Thanks very much
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