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Port ClutterText to ClutterPaintNode
The port to use ClutterPaintNodes basically mirrors what
it currently does, with the major benefit of not depending
on cogl_get_draw_framebuffer() anymore.
There are various factors that influence the number of
subnodes:
* The background color adds a color subnode;
* The selection adds a clip subnode, and a color subnode,
or a color and a text subnode;
The simplest case is when the text does not overflow and
has no background color nor selection. In that case, the
render tree is simply:
[ Dummy ]
↓
[ Text ]
In contrast, the most complex case is when drawing the text
with selection, in which case the render tree looks like:
[ Dummy ]
↓
[ Clip ]
↓
[ Text ] → [ Clip ]
↓
[ Color ] → [ Text ]
Since the selection may have another text color, the selected
text must be rendered again, but clipped to only cover the
selection rectangle. This is suboptimal, but it's what the
current code already does anyway.
This commit is contained in:
Georges Basile Stavracas Neto
parent
cc75fc88ee
commit
5a4ade857a
@ -1746,7 +1746,8 @@ add_selection_rectangle_to_path (ClutterText *text,
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/* Draws the selected text, its background, and the cursor */
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static void
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selection_paint (ClutterText *self)
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paint_selection (ClutterText *self,
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ClutterPaintNode *node)
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{
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ClutterTextPrivate *priv = self->priv;
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ClutterActor *actor = CLUTTER_ACTOR (self);
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@ -1758,33 +1759,59 @@ selection_paint (ClutterText *self)
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if (priv->position == priv->selection_bound)
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{
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g_autoptr(ClutterPaintNode) cursor_node = NULL;
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/* No selection, just draw the cursor */
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if (priv->cursor_color_set)
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color = &priv->cursor_color;
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else
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color = &priv->text_color;
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cogl_set_source_color4ub (color->red,
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cursor_node = clutter_color_node_new (&(ClutterColor) {
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color->red,
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color->green,
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color->blue,
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paint_opacity * color->alpha / 255);
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paint_opacity * color->alpha / 255,
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});
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clutter_paint_node_set_name (cursor_node, "ClutterText.selection-background");
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clutter_paint_node_add_child (node, cursor_node);
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cogl_rectangle (priv->cursor_rect.origin.x,
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clutter_paint_node_add_rectangle (cursor_node,
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&(ClutterActorBox) {
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priv->cursor_rect.origin.x,
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priv->cursor_rect.origin.y,
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priv->cursor_rect.origin.x + priv->cursor_rect.size.width,
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priv->cursor_rect.origin.y + priv->cursor_rect.size.height);
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priv->cursor_rect.origin.y + priv->cursor_rect.size.height
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});
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}
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else
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{
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/* Paint selection background first */
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g_autoptr(ClutterPaintNode) selection_background_node = NULL;
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g_autoptr(ClutterPaintNode) selection_text_node = NULL;
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g_autoptr(ClutterPaintNode) selection_clip_node = NULL;
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PangoLayout *layout = clutter_text_get_layout (self);
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ClutterActorBox alloc = { 0, };
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CoglPath *selection_path = cogl_path_new ();
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CoglColor cogl_color = { 0, };
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CoglFramebuffer *fb;
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fb = cogl_get_draw_framebuffer ();
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if (G_UNLIKELY (fb == NULL))
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return;
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clutter_text_foreach_selection_rectangle (self,
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add_selection_rectangle_to_path,
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selection_path);
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/* Clip against both the actor allocation - we don't want to draw
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* the selection rectangle outside the actor - and the selection
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* path - we don't want to render the text over the unselected
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* text either.
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*/
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selection_clip_node = clutter_clip_node_new ();
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clutter_paint_node_set_name (selection_clip_node, "ClutterText.clip-selection");
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clutter_paint_node_add_child (node, selection_clip_node);
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clutter_actor_get_allocation_box (CLUTTER_ACTOR (self), &alloc);
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clutter_actor_box_set_origin (&alloc, 0, 0);
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clutter_paint_node_add_rectangle (selection_clip_node, &alloc);
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clutter_paint_node_add_path (selection_clip_node, selection_path);
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/* Paint selection background */
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if (priv->selection_color_set)
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@ -1794,35 +1821,40 @@ selection_paint (ClutterText *self)
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else
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color = &priv->text_color;
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cogl_set_source_color4ub (color->red,
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selection_background_node = clutter_color_node_new (&(ClutterColor) {
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color->red,
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color->green,
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color->blue,
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paint_opacity * color->alpha / 255);
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paint_opacity * color->alpha / 255,
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});
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clutter_paint_node_set_name (selection_background_node, "ClutterText.selection-background");
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clutter_paint_node_add_child (selection_clip_node, selection_background_node);
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clutter_text_foreach_selection_rectangle (self,
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add_selection_rectangle_to_path,
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selection_path);
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cogl_path_fill (selection_path);
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clutter_paint_node_add_path (selection_background_node, selection_path);
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/* Paint selected text */
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cogl_framebuffer_push_path_clip (fb, selection_path);
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cogl_object_unref (selection_path);
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if (priv->selected_text_color_set)
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color = &priv->selected_text_color;
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else
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color = &priv->text_color;
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cogl_color_init_from_4ub (&cogl_color,
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selection_text_node = clutter_text_node_new (layout,
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&(ClutterColor) {
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color->red,
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color->green,
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color->blue,
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paint_opacity * color->alpha / 255);
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paint_opacity * color->alpha / 255,
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});
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cogl_pango_render_layout (layout, priv->text_x, 0, &cogl_color, 0);
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clutter_paint_node_set_name (selection_text_node, "ClutterText.selection-text");
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clutter_paint_node_add_child (selection_clip_node, selection_text_node);
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cogl_framebuffer_pop_clip (fb);
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clutter_paint_node_add_texture_rectangle (selection_text_node,
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&alloc,
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priv->text_x, priv->text_y,
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1, 1);
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cogl_object_unref (selection_path);
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}
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}
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@ -2373,26 +2405,43 @@ clutter_text_compute_layout_offsets (ClutterText *self,
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#define TEXT_PADDING 2
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static void
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clutter_text_paint (ClutterActor *self)
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static inline ClutterPaintNode *
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create_clip_node (ClutterPaintNode *node,
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float width,
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float height)
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{
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g_autoptr(ClutterPaintNode) clip_node = NULL;
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clip_node = clutter_clip_node_new ();
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clutter_paint_node_set_name (clip_node, "ClutterText.clip");
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clutter_paint_node_add_child (node, clip_node);
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clutter_paint_node_add_rectangle (clip_node,
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&(ClutterActorBox) {
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0, 0,
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width, height,
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});
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return g_steal_pointer (&clip_node);
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}
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static void
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clutter_text_paint_node (ClutterActor *self,
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ClutterPaintNode *node)
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{
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g_autoptr(ClutterPaintNode) text_node = NULL;
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ClutterText *text = CLUTTER_TEXT (self);
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ClutterTextPrivate *priv = text->priv;
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CoglFramebuffer *fb;
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PangoLayout *layout;
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ClutterActorBox alloc = { 0, };
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CoglColor color = { 0, };
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guint8 real_opacity;
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gint text_x = priv->text_x;
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gint text_y = priv->text_y;
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gboolean clip_set = FALSE;
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gboolean bg_color_set = FALSE;
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guint n_chars;
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float alloc_width;
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float alloc_height;
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fb = cogl_get_draw_framebuffer ();
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/* Note that if anything in this paint method changes it needs to be
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reflected in the get_paint_volume implementation which is tightly
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tied to the workings of this function */
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@ -2405,6 +2454,7 @@ clutter_text_paint (ClutterActor *self)
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g_object_get (self, "background-color-set", &bg_color_set, NULL);
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if (bg_color_set)
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{
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g_autoptr(ClutterPaintNode) background_color_node = NULL;
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ClutterColor bg_color;
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clutter_actor_get_background_color (self, &bg_color);
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@ -2412,11 +2462,11 @@ clutter_text_paint (ClutterActor *self)
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* bg_color.alpha
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/ 255;
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cogl_set_source_color4ub (bg_color.red,
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bg_color.green,
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bg_color.blue,
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bg_color.alpha);
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cogl_rectangle (0, 0, alloc_width, alloc_height);
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background_color_node = clutter_color_node_new (&bg_color);
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clutter_paint_node_set_name (background_color_node, "ClutterText.background-color");
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clutter_paint_node_add_child (node, background_color_node);
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clutter_paint_node_add_rectangle (background_color_node, &alloc);
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}
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/* don't bother painting an empty text actor, unless it's
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@ -2469,8 +2519,7 @@ clutter_text_paint (ClutterActor *self)
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pango_layout_get_extents (layout, NULL, &logical_rect);
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cogl_framebuffer_push_rectangle_clip (fb, 0, 0, alloc_width, alloc_height);
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clip_set = TRUE;
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node = create_clip_node (node, alloc_width, alloc_height);
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actor_width = alloc_width - 2 * TEXT_PADDING;
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text_width = logical_rect.width / PANGO_SCALE;
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@ -2513,12 +2562,8 @@ clutter_text_paint (ClutterActor *self)
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pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
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/* don't clip if the layout managed to fit inside our allocation */
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if (logical_rect.width > alloc_width ||
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logical_rect.height > alloc_height)
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{
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cogl_framebuffer_push_rectangle_clip (fb, 0, 0, alloc_width, alloc_height);
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clip_set = TRUE;
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}
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if (logical_rect.width > alloc_width || logical_rect.height > alloc_height)
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node = create_clip_node (node, alloc_width, alloc_height);
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clutter_text_compute_layout_offsets (text, layout, &alloc, &text_x, &text_y);
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}
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@ -2541,17 +2586,25 @@ clutter_text_paint (ClutterActor *self)
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CLUTTER_NOTE (PAINT, "painting text (text: '%s')",
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clutter_text_buffer_get_text (get_buffer (text)));
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cogl_color_init_from_4ub (&color,
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text_node = clutter_text_node_new (layout,
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&(ClutterColor) {
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priv->text_color.red,
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priv->text_color.green,
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priv->text_color.blue,
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real_opacity);
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cogl_pango_render_layout (layout, priv->text_x, priv->text_y, &color, 0);
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real_opacity
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});
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selection_paint (text);
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clutter_paint_node_set_name (text_node, "ClutterText.text");
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clutter_paint_node_add_child (node, text_node);
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if (clip_set)
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cogl_framebuffer_pop_clip (fb);
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clutter_actor_box_set_origin (&alloc, 0, 0);
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clutter_paint_node_add_texture_rectangle (text_node,
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&alloc,
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priv->text_x,
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priv->text_y,
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1, 1);
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paint_selection (text, node);
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}
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static void
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@ -3548,7 +3601,7 @@ clutter_text_class_init (ClutterTextClass *klass)
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gobject_class->dispose = clutter_text_dispose;
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gobject_class->finalize = clutter_text_finalize;
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actor_class->paint = clutter_text_paint;
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actor_class->paint_node = clutter_text_paint_node;
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actor_class->get_paint_volume = clutter_text_get_paint_volume;
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actor_class->get_preferred_width = clutter_text_get_preferred_width;
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actor_class->get_preferred_height = clutter_text_get_preferred_height;
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