AuroraMiddleware/gtk
1
0
Fork 1
mirror of https://gitlab.gnome.org/GNOME/gtk.git synced 2024-11-09 18:30:08 +00:00
Code Issues Projects Releases Wiki Activity

scaling test: Avoid dividing zero by zero

Browse Source 
If all four of the random colours have alpha channel exactly 0.0,
then the computed premultiplied average will also be zero.
Normalize the expected colour to (0,0,0,0) rather than (NaN,NaN,NaN,0).

Resolves: https://gitlab.gnome.org/GNOME/gtk/-/issues/6977
Signed-off-by: Simon McVittie <smcv@debian.org>
This commit is contained in:
Simon McVittie 2024-09-03 00:12:48 +01:00
parent 6e54589d9e
commit 4c4d260199
1 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
testsuite/gsk/scaling.c
View File

@ -896,10 +896,22 @@ create_stipple_texture (GdkMemoryFormat format,
} }
} }
average->red /= average->alpha; if (average->alpha != 0.0f)
average->green /= average->alpha; {
average->blue /= average->alpha; average->red /= average->alpha;
average->alpha /= 4.0f; average->green /= average->alpha;
average->blue /= average->alpha;
average->alpha /= 4.0f;
}
else
{
/* Each component of the average has been multiplied by the alpha
* already, so if the alpha is zero, all components should also
* be zero */
g_assert_cmpfloat (average->red, ==, 0.0f);
g_assert_cmpfloat (average->green, ==, 0.0f);
g_assert_cmpfloat (average->blue, ==, 0.0f);
}
texture_builder_init (&builder, format, width, height); texture_builder_init (&builder, format, width, height);
for (y = 0; y < height; y++) for (y = 0; y < height; y++)