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Merge branch 'wip/smcv/transparent-is-transparent' into 'master'

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reftest-compare: Treat colour channels as undefined if alpha is zero

Closes #4227

See merge request GNOME/gtk!3914
This commit is contained in:
Matthias Clasen 2021-09-02 22:19:27 +00:00
commit a45cbad553
1 changed files with 6 additions and 1 deletions
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7
testsuite/reftests/reftest-compare.c
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@ -104,7 +104,12 @@ buffer_diff_core (const guchar *buf_a,
/* check if the pixels are the same */
if (row_a[x] == row_b[x])
continue;
/* even if they're not literally the same, fully-transparent
* pixels are effectively the same regardless of colour */
if ((row_a[x] & 0xff000000) == 0 && (row_b[x] & 0xff000000) == 0)
continue;
if (diff == NULL)
{
diff = cairo_image_surface_create (CAIRO_FORMAT_RGB24,