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Avoid (un)premultiplication for overlay image without alpha channel

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Add 'premultiplied' boolean attribute to output info, helps test
This commit is contained in:
Lovell Fuller
2017-03-25 16:52:09 +00:00
parent 301bfbd271
commit 1169afbe90
11 changed files with 109 additions and 104 deletions
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14
src/operations.h
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@@ -32,20 +32,14 @@ namespace sharp {
VImage Composite(VImage src, VImage dst, const int gravity);
/*
Alpha composite src over dst with given x and y offsets.
Assumes alpha channels are already premultiplied and will be unpremultiplied after.
Composite overlayImage over image at given position
*/
VImage Composite(VImage src, VImage dst, const int x, const int y);
VImage Composite(VImage image, VImage overlayImage, int const x, int const y);
/*
Check if the src and dst Images for composition operation are valid
Alpha composite overlayImage over image, assumes matching dimensions
*/
bool IsInputValidForComposition(VImage src, VImage dst);
/*
Given a valid src and dst, returns the composite of the two images
*/
VImage CompositeImage(VImage src, VImage dst);
VImage AlphaComposite(VImage image, VImage overlayImage);
/*
Cutout src over dst with given gravity.