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snapshot: Use a better placeholder

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An empty container has the same effect as transparency
with the cairo renderer, but creates black with Vulkan.
To avoid this, explicitly use a transparent color node.

This fixes the css blendmode example in gtk4-demo with
the Vulkan renderer.
This commit is contained in:
Matthias Clasen 2017-10-08 22:19:22 -04:00
parent e3f5a8bd47
commit 672fb60879
1 changed files with 5 additions and 2 deletions
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7
gtk/gtksnapshot.c
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@ -746,15 +746,18 @@ gtk_snapshot_collect_blend_top (GtkSnapshot *snapshot,
const char *name)
{
GskRenderNode *bottom_node, *top_node, *blend_node;
GdkRGBA transparent = { 0, 0, 0, 0 };
top_node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes, name);
bottom_node = state->data.blend.bottom_node;
g_assert (top_node != NULL || bottom_node != NULL);
/* XXX: Is this necessary? Do we need a NULL node? */
if (top_node == NULL)
top_node = gsk_container_node_new (NULL, 0);
top_node = gsk_color_node_new (&transparent, &bottom_node->bounds);
if (bottom_node == NULL)
bottom_node = gsk_container_node_new (NULL, 0);
bottom_node = gsk_color_node_new (&transparent, &top_node->bounds);
blend_node = gsk_blend_node_new (bottom_node, top_node, state->data.blend.blend_mode);
gsk_render_node_set_name (blend_node, name);