From: Benjamin Otte <otte@redhat.com>
Date: Thu, 7 Sep 2023 20:57:57 +0000 (+0200)
Subject: rendernode: Shadow nodes need offscreen for opacity
X-Git-Tag: archive/raspbian/4.12.4+ds-3+rpi1^2~21^2~2^2~17
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=77d5b5e94fdfc0805c6c0dea52fa611f7fc503fe;p=gtk4.git

rendernode: Shadow nodes need offscreen for opacity

Otherwise the shadow will not be properly computed as opaque regions
become translucent after applying opacity.

Testcase included.
---

diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index 08bdc58e47..80bf406ae3 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -4593,7 +4593,7 @@ gsk_shadow_node_new (GskRenderNode   *child,
 
   self = gsk_render_node_alloc (GSK_SHADOW_NODE);
   node = (GskRenderNode *) self;
-  node->offscreen_for_opacity = child->offscreen_for_opacity;
+  node->offscreen_for_opacity = TRUE;
 
   self->child = gsk_render_node_ref (child);
   self->n_shadows = n_shadows;
diff --git a/testsuite/gsk/compare/shadow-opacity.node b/testsuite/gsk/compare/shadow-opacity.node
new file mode 100644
index 0000000000..d9bded6b84
--- /dev/null
+++ b/testsuite/gsk/compare/shadow-opacity.node
@@ -0,0 +1,10 @@
+opacity {
+  opacity: 0.6;
+  child: shadow {
+    shadows: rgb(255,0,0) 10 10;
+    child: color {
+      bounds: 0 0 50 50;
+      color: rgb(0,0,255);
+    }
+  }
+}
diff --git a/testsuite/gsk/compare/shadow-opacity.png b/testsuite/gsk/compare/shadow-opacity.png
new file mode 100644
index 0000000000..ab25ef430a
Binary files /dev/null and b/testsuite/gsk/compare/shadow-opacity.png differ
diff --git a/testsuite/gsk/meson.build b/testsuite/gsk/meson.build
index eb76c4a889..944d4f8f99 100644
--- a/testsuite/gsk/meson.build
+++ b/testsuite/gsk/meson.build
@@ -90,6 +90,7 @@ compare_render_tests = [
   'scaled-cairo',
   'scaled-texture',
   'shadow-in-opacity',
+  'shadow-opacity',
   'texture-scale-magnify-10000x',
   'texture-scale-magnify-rotate',
   'texture-scale-stripes',