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[fix] Properly account for MuPDF feeding us premultiplied alpha (#4807)

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* Properly account for MuPDF feeding us premultiplied alpha

* Bump base to pickup necessary backend changes

Also includes a bunch of CMake refactoring
(https://github.com/koreader/koreader-base/pull/865
https://github.com/koreader/koreader-base/pull/867
https://github.com/koreader/koreader-base/pull/868)
This commit is contained in:
NiLuJe
2019-03-18 09:35:27 +01:00
committed by Frans de Jonge
parent 59d8a1852f
commit 003de939b0
3 changed files with 5 additions and 3 deletions
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3
frontend/ui/widget/textboxwidget.lua
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@@ -431,7 +431,8 @@ function TextBoxWidget:_renderImage(start_row_idx)
-- With alpha-blending if the image contains an alpha channel
local bbtype = image.bb:getType()
if bbtype == Blitbuffer.TYPE_BB8A or bbtype == Blitbuffer.TYPE_BBRGB32 then
self._bb:alphablitFrom(image.bb, self.width - image.width, 0)
-- NOTE: MuPDF feeds us premultiplied alpha (and we don't care w/ GifLib, as alpha is all or nothing).
self._bb:pmulalphablitFrom(image.bb, self.width - image.width, 0)
else
self._bb:blitFrom(image.bb, self.width - image.width, 0)
end