gtk2/gtk/gtkthemingbackground.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
* Copyright (C) 2011 Red Hat, Inc.
*
* Authors: Carlos Garnacho <carlosg@gnome.org>
* Cosimo Cecchi <cosimoc@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gtkcsstypesprivate.h"
#include "gtkthemingbackgroundprivate.h"
#include "gtkthemingengineprivate.h"
#include <gdk/gdk.h>
static void
_gtk_theming_background_apply_window_background (GtkThemingBackground *bg,
cairo_t *cr)
{
if (gtk_theming_engine_has_class (bg->engine, "background"))
{
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint (cr);
}
}
static void
_gtk_theming_background_apply_origin (GtkThemingBackground *bg)
{
GtkCssArea origin;
cairo_rectangle_t image_rect;
gtk_theming_engine_get (bg->engine, bg->flags,
"background-origin", &origin,
NULL);
/* The default size of the background image depends on the
background-origin value as this affects the top left
and the bottom right corners. */
switch (origin) {
case GTK_CSS_AREA_BORDER_BOX:
image_rect.x = 0;
image_rect.y = 0;
image_rect.width = bg->paint_area.width;
image_rect.height = bg->paint_area.height;
break;
case GTK_CSS_AREA_CONTENT_BOX:
image_rect.x = bg->border.left + bg->padding.left;
image_rect.y = bg->border.top + bg->padding.top;
image_rect.width = bg->paint_area.width - bg->border.left - bg->border.right - bg->padding.left - bg->padding.right;
image_rect.height = bg->paint_area.height - bg->border.top - bg->border.bottom - bg->padding.top - bg->padding.bottom;
break;
case GTK_CSS_AREA_PADDING_BOX:
default:
image_rect.x = bg->border.left;
image_rect.y = bg->border.top;
image_rect.width = bg->paint_area.width - bg->border.left - bg->border.right;
image_rect.height = bg->paint_area.height - bg->border.top - bg->border.bottom;
break;
}
bg->image_rect = image_rect;
}
static void
_gtk_theming_background_apply_clip (GtkThemingBackground *bg)
{
GtkCssArea clip;
gtk_theming_engine_get (bg->engine, bg->flags,
"background-clip", &clip,
NULL);
if (clip == GTK_CSS_AREA_PADDING_BOX)
{
_gtk_rounded_box_shrink (&bg->clip_box,
bg->border.top, bg->border.right,
bg->border.bottom, bg->border.left);
}
else if (clip == GTK_CSS_AREA_CONTENT_BOX)
{
_gtk_rounded_box_shrink (&bg->clip_box,
bg->border.top + bg->padding.top,
bg->border.right + bg->padding.right,
bg->border.bottom + bg->padding.bottom,
bg->border.left + bg->padding.left);
}
}
static void
_gtk_theming_background_paint (GtkThemingBackground *bg,
cairo_t *cr)
{
cairo_save (cr);
_gtk_rounded_box_path (&bg->clip_box, cr);
cairo_clip (cr);
gdk_cairo_set_source_rgba (cr, &bg->bg_color);
cairo_paint (cr);
if (bg->image)
{
GtkCssBackgroundRepeat *repeat;
double image_width, image_height;
gtk_theming_engine_get (bg->engine, bg->flags,
"background-repeat", &repeat,
NULL);
_gtk_css_image_get_concrete_size (bg->image,
0, 0, /* XXX: needs background-size support */
bg->image_rect.width, bg->image_rect.height,
&image_width, &image_height);
cairo_translate (cr, bg->image_rect.x, bg->image_rect.y);
/* XXX: repeat flags */
_gtk_css_image_draw (bg->image, cr, image_width, image_height);
}
cairo_restore (cr);
}
static void
_gtk_theming_background_apply_shadow (GtkThemingBackground *bg,
cairo_t *cr)
{
GtkShadow *box_shadow;
gtk_theming_engine_get (bg->engine, bg->flags,
"box-shadow", &box_shadow,
NULL);
if (box_shadow != NULL)
{
_gtk_box_shadow_render (box_shadow, cr, &bg->padding_box);
_gtk_shadow_unref (box_shadow);
}
}
static void
_gtk_theming_background_init_engine (GtkThemingBackground *bg)
{
bg->flags = gtk_theming_engine_get_state (bg->engine);
gtk_theming_engine_get_border (bg->engine, bg->flags, &bg->border);
gtk_theming_engine_get_padding (bg->engine, bg->flags, &bg->padding);
gtk_theming_engine_get_background_color (bg->engine, bg->flags, &bg->bg_color);
/* In the CSS box model, by default the background positioning area is
* the padding-box, i.e. all the border-box minus the borders themselves,
* which determines also its default size, see
* http://dev.w3.org/csswg/css3-background/#background-origin
*
* In the future we might want to support different origins or clips, but
* right now we just shrink to the default.
*/
_gtk_rounded_box_init_rect (&bg->padding_box, 0, 0, bg->paint_area.width, bg->paint_area.height);
_gtk_rounded_box_apply_border_radius (&bg->padding_box, bg->engine, bg->flags, bg->junction);
bg->clip_box = bg->padding_box;
_gtk_rounded_box_shrink (&bg->padding_box,
bg->border.top, bg->border.right,
bg->border.bottom, bg->border.left);
_gtk_theming_background_apply_clip (bg);
_gtk_theming_background_apply_origin (bg);
bg->image = g_value_get_object (_gtk_theming_engine_peek_property (bg->engine, "background-image"));
}
void
_gtk_theming_background_init (GtkThemingBackground *bg,
GtkThemingEngine *engine,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
GtkJunctionSides junction)
{
g_assert (bg != NULL);
bg->engine = engine;
bg->paint_area.x = x;
bg->paint_area.y = y;
bg->paint_area.width = width;
bg->paint_area.height = height;
bg->image = NULL;
bg->junction = junction;
_gtk_theming_background_init_engine (bg);
}
void
_gtk_theming_background_render (GtkThemingBackground *bg,
cairo_t *cr)
{
cairo_save (cr);
cairo_translate (cr, bg->paint_area.x, bg->paint_area.y);
_gtk_theming_background_apply_window_background (bg, cr);
_gtk_theming_background_paint (bg, cr);
_gtk_theming_background_apply_shadow (bg, cr);
cairo_restore (cr);
}
gboolean
_gtk_theming_background_has_background_image (GtkThemingBackground *bg)
{
return (bg->image != NULL) ? TRUE : FALSE;
}