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Subject: |
27.0.50; SVG transparency handling is inaccurate |
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Date: |
Thu, 20 Jun 2019 20:26:53 +0000 |
Evaluate the following in emacs -Q:
(require 'svg)
(defun make-image (color)
(let ((svg (svg-create 100 100)))
(svg-rectangle svg 0 0 100 100 :fill color)
(svg-image svg)))
(set-frame-parameter (window-frame) 'background-color "black")
(insert (propertize " " 'display (make-image "#f00000")))
The expected result is a rectangle (on black background) of color
#f00000. The actual result is a rectangle of color #ef0000. For black
backgrounds, white is no longer representable.
This is related to bug #36304, but much easier to fix.
Patch attached.
0001-SVG-scale-color-values-properly.patch
Description: Text Data
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--- Begin Message ---
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Subject: |
Re: bug#36315: Incorrect SVG color |
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Date: |
Fri, 18 Dec 2020 18:04:45 +0000 |
On Fri, Dec 18, 2020 at 04:42:03PM +0000, Qiantan Hong wrote:
> I fixed my build and it behaves correctly on macOS
> now.
>
> M-x emacs-version
> GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60
> Version 10.14.6 (Build 18G6032)) of 2020-12-18
Excellent! Thanks for letting us know.
> To make sure I understand it, did we start outsourcing color some point after
> 27.1?
We pass the foreground and background colours into librsvg, which
creates the bitmap image that's displayed, in a commit that's just a
few months old. It will appear in Emacs 28.
I don't expect the change to be included in Emacs 27 since it's a
fairly large change introducing a number of new features and any new
Emacs 27 releases will be primarily bug fixes.
--
Alan Third
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