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overlayWith improvements: diff sizes/formats, gravity, buffer input

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Lovell Fuller
2016-02-29 14:30:29 +00:00
parent 55f204c6f9
commit d92ea31858
21 changed files with 407 additions and 242 deletions
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6
src/operations.h
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@@ -8,10 +8,10 @@ using vips::VImage;
namespace sharp {
/*
Composite images `src` and `dst` with premultiplied alpha channel and output
image with premultiplied alpha.
Alpha composite src over dst with given gravity.
Assumes alpha channels are already premultiplied and will be unpremultiplied after.
*/
VImage Composite(VImage src, VImage dst);
VImage Composite(VImage src, VImage dst, const int gravity);
/*
* Stretch luminance to cover full dynamic range.