GNU bug report logs - #36315
27.0.50; SVG transparency handling is inaccurate

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Package: emacs;

Reported by: Pip Cet <pipcet <at> gmail.com>

Date: Thu, 20 Jun 2019 20:28:02 UTC

Severity: normal

Found in version 27.0.50

Done: Alan Third <alan <at> idiocy.org>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Pip Cet <pipcet <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; SVG transparency handling is inaccurate
Date: Thu, 20 Jun 2019 20:26:53 +0000

[Message part 1 (text/plain, inline)]
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 (text/x-patch, attachment)]
This bug report was last modified 3 years and 219 days ago.

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