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renderer: Track the previous node

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... and diff the previous node with the current one to determine the
clip region.

This doubles the work necessary to track clip regions, but the following
commits will clean that up.
This commit is contained in:
Benjamin Otte 2018-03-28 15:43:43 +02:00
parent 7c313c7b25
commit 925cbeaadf
1 changed files with 25 additions and 15 deletions
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40
gsk/gskrenderer.c
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@ -66,6 +66,7 @@ typedef struct
GObject parent_instance;
GdkSurface *surface;
GskRenderNode *prev_node;
GskRenderNode *root_node;
GdkDisplay *display;
@ -375,6 +376,8 @@ gsk_renderer_unrealize (GskRenderer *renderer)
GSK_RENDERER_GET_CLASS (renderer)->unrealize (renderer);
g_clear_pointer (&priv->prev_node, gsk_render_node_unref);
priv->is_realized = FALSE;
}
@ -465,32 +468,37 @@ gsk_renderer_render (GskRenderer *renderer,
const cairo_region_t *region)
{
GskRendererPrivate *priv = gsk_renderer_get_instance_private (renderer);
cairo_region_t *real_region;
cairo_region_t *clip;
g_return_if_fail (GSK_IS_RENDERER (renderer));
g_return_if_fail (priv->is_realized);
g_return_if_fail (GSK_IS_RENDER_NODE (root));
g_return_if_fail (priv->root_node == NULL);
priv->root_node = gsk_render_node_ref (root);
if (region == NULL || GSK_RENDERER_DEBUG_CHECK (renderer, FULL_REDRAW))
if (region == NULL || priv->prev_node == NULL || GSK_RENDERER_DEBUG_CHECK (renderer, FULL_REDRAW))
{
real_region = cairo_region_create_rectangle (&(GdkRectangle) {
0, 0,
gdk_surface_get_width (priv->surface),
gdk_surface_get_height (priv->surface)
});
GSK_RENDERER_GET_CLASS (renderer)->render (renderer, root, real_region);
cairo_region_destroy (real_region);
clip = cairo_region_create_rectangle (&(GdkRectangle) {
0, 0,
gdk_surface_get_width (priv->surface),
gdk_surface_get_height (priv->surface)
});
}
else
{
GSK_RENDERER_GET_CLASS (renderer)->render (renderer, root, region);
clip = cairo_region_copy (region);
gsk_render_node_diff (priv->prev_node, root, clip);
if (cairo_region_is_empty (clip))
{
cairo_region_destroy (clip);
return;
}
}
priv->root_node = gsk_render_node_ref (root);
GSK_RENDERER_GET_CLASS (renderer)->render (renderer, root, clip);
#ifdef G_ENABLE_DEBUG
if (GSK_RENDERER_DEBUG_CHECK (renderer, RENDERER))
{
@ -508,7 +516,9 @@ gsk_renderer_render (GskRenderer *renderer,
}
#endif
g_clear_pointer (&priv->root_node, gsk_render_node_unref);
g_clear_pointer (&priv->prev_node, gsk_render_node_unref);
priv->prev_node = priv->root_node;
priv->root_node = NULL;
}
/*< private >