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-rw-r--r--gfx/cairo/premultiply-alpha-solid-gradients.patch46
1 files changed, 46 insertions, 0 deletions
diff --git a/gfx/cairo/premultiply-alpha-solid-gradients.patch b/gfx/cairo/premultiply-alpha-solid-gradients.patch
new file mode 100644
index 000000000..665f64969
--- /dev/null
+++ b/gfx/cairo/premultiply-alpha-solid-gradients.patch
@@ -0,0 +1,46 @@
+Fix single and multi-stop solid gradients by multiplying by the alpha component. r=roc
+
+This cairo commit that caused the problem: 2d790daa957471670f4ae0d3b22da89e4ee7111f.
+It was merged into mozilla-central with 1effb72d30cf
+
+diff --git a/gfx/cairo/cairo/src/cairo-pattern.c b/gfx/cairo/cairo/src/cairo-pattern.c
+--- a/gfx/cairo/cairo/src/cairo-pattern.c
++++ b/gfx/cairo/cairo/src/cairo-pattern.c
+@@ -2262,8 +2262,17 @@ _cairo_pattern_acquire_surface (const ca
+
+ if (src->n_stops)
+ {
++ cairo_color_t color;
++
++ /* multiply by alpha */
++ _cairo_color_init_rgba (&color,
++ src->stops->color.red,
++ src->stops->color.green,
++ src->stops->color.blue,
++ src->stops->color.alpha);
++
+ _cairo_pattern_init_solid (&solid,
+- &src->stops->color,
++ &color,
+ CAIRO_CONTENT_COLOR_ALPHA);
+ }
+ else
+@@ -2295,9 +2304,17 @@ _cairo_pattern_acquire_surface (const ca
+ }
+ if (i == src->n_stops) {
+ cairo_solid_pattern_t solid;
++ cairo_color_t color;
++
++ /* multiply by alpha */
++ _cairo_color_init_rgba (&color,
++ src->stops->color.red,
++ src->stops->color.green,
++ src->stops->color.blue,
++ src->stops->color.alpha);
+
+ _cairo_pattern_init_solid (&solid,
+- &src->stops->color,
++ &color,
+ CAIRO_CONTENT_COLOR_ALPHA);
+
+ status =