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stylecontext: add opaque background helper

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This new private API, _gtk_style_context_is_background_opaque(), is meant to
be used by internal Gtk+ wigets to optimize fast paths for cases where
applicable. One such use would be to use a CAIRO_CONTENT_COLOR surface
instead of CAIRO_CONTENT_COLOR_ALPHA.

https://bugzilla.gnome.org/show_bug.cgi?id=754658
This commit is contained in:
Christian Hergert 2015-09-08 14:45:51 -07:00
parent b64a0b9233
commit c1691a4964
2 changed files with 18 additions and 5 deletions
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21
gtk/gtkstylecontext.c
View File

@ -2504,11 +2504,7 @@ gtk_style_context_set_background (GtkStyleContext *context,
*/
color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BACKGROUND_COLOR));
if (color->alpha >= 1.0 &&
corner_value_is_right_angle (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_TOP_LEFT_RADIUS)) &&
corner_value_is_right_angle (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_TOP_RIGHT_RADIUS)) &&
corner_value_is_right_angle (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_BOTTOM_RIGHT_RADIUS)) &&
corner_value_is_right_angle (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_BOTTOM_LEFT_RADIUS)))
if (_gtk_style_context_is_background_opaque (context))
{
gdk_window_set_background_rgba (window, color);
}
@ -3305,3 +3301,18 @@ gtk_gradient_resolve_for_context (GtkGradient *gradient,
priv->parent ? gtk_style_context_lookup_style (priv->parent) : NULL);
}
gboolean
_gtk_style_context_is_background_opaque (GtkStyleContext *context)
{
const GdkRGBA *color;
g_return_val_if_fail (context != NULL, FALSE);
color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BACKGROUND_COLOR));
return (color->alpha >= 1.0 &&
corner_value_is_right_angle (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_TOP_LEFT_RADIUS)) &&
corner_value_is_right_angle (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_TOP_RIGHT_RADIUS)) &&
corner_value_is_right_angle (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_BOTTOM_RIGHT_RADIUS)) &&
corner_value_is_right_angle (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_BOTTOM_LEFT_RADIUS)));
}

2
gtk/gtkstylecontextprivate.h
View File

@ -64,6 +64,8 @@ void _gtk_style_context_get_icon_extents (GtkStyleContext
gint width,
gint height);
gboolean _gtk_style_context_is_background_opaque (GtkStyleContext *context);
PangoAttrList *_gtk_style_context_get_pango_attributes (GtkStyleContext *context);
/* Accessibility support */