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cssfiltervalue: Fix blur filter interpretation

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According to https://www.w3.org/TR/filter-effects-1/,
the length passed to blur() is the standard deviation,
and according to https://www.w3.org/TR/css-backgrounds-3/#shadow-blur
the blur radius is twice the standard deviation.
This commit is contained in:
Matthias Clasen 2021-02-05 22:06:56 -05:00
parent ea7185bdb1
commit cc6fcbfc09
1 changed files with 2 additions and 3 deletions
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5
gtk/gtkcssfiltervalue.c
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@ -939,7 +939,6 @@ gtk_css_filter_value_push_snapshot (const GtkCssValue *filter,
graphene_matrix_t matrix;
graphene_vec4_t offset;
int i, j;
double radius;
if (gtk_css_filter_value_is_none (filter))
return;
@ -955,8 +954,8 @@ gtk_css_filter_value_push_snapshot (const GtkCssValue *filter,
{
if (filter->filters[j].type == GTK_CSS_FILTER_BLUR)
{
radius = _gtk_css_number_value_get (filter->filters[j].blur.value, 100.0);
gtk_snapshot_push_blur (snapshot, radius);
double std_dev = _gtk_css_number_value_get (filter->filters[j].blur.value, 100.0);
gtk_snapshot_push_blur (snapshot, 2 * std_dev);
}
else if (filter->filters[j].type == GTK_CSS_FILTER_DROP_SHADOW)
{