gtk/gtkrender.c - external/github.com/GNOME/gtk - Git at Google

 /* GTK - The GIMP Toolkit
  * Copyright (C) 2010 Carlos Garnacho <carlosg@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, see <http://www.gnu.org/licenses/>.
  */

 #include "config.h"

 #include "gtkrender.h"

 #include <math.h>

 #include "gtkcsscornervalueprivate.h"
 #include "gtkcssimagevalueprivate.h"
 #include "gtkcssnumbervalueprivate.h"
 #include "gtkcsscolorvalueprivate.h"
 #include "gtkcssshadowvalueprivate.h"
 #include "gtkcsstransformvalueprivate.h"
 #include "gtkrendericonprivate.h"
 #include "gtkstylecontextprivate.h"

 #include "gsk/gskroundedrectprivate.h"
 #include <gdk/gdktextureprivate.h>

 static void
 gtk_do_render_icon (GtkStyleContext        *context,
                     cairo_t                *cr,
                     double                  x,
                     double                  y,
                     double                  width,
                     double                  height)
 {
   GtkSnapshot *snapshot;
   GskRenderNode *node;

   snapshot = gtk_snapshot_new ();
   gtk_css_style_snapshot_icon (gtk_style_context_lookup_style (context), snapshot, width, height);
   node = gtk_snapshot_free_to_node (snapshot);
   if (node == NULL)
     return;

   cairo_save (cr);
   cairo_translate (cr, x, y);
   gsk_render_node_draw (node, cr);
   cairo_restore (cr);

   gsk_render_node_unref (node);
 }

 /**
  * gtk_render_check:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin of the rectangle
  * @y: Y origin of the rectangle
  * @width: rectangle width
  * @height: rectangle height
  *
  * Renders a checkmark (as in a #GtkCheckButton).
  *
  * The %GTK_STATE_FLAG_CHECKED state determines whether the check is
  * on or off, and %GTK_STATE_FLAG_INCONSISTENT determines whether it
  * should be marked as undefined.
  *
  * Typical checkmark rendering:
  *
  * ![](checks.png)
  **/
 void
 gtk_render_check (GtkStyleContext *context,
                   cairo_t         *cr,
                   double           x,
                   double           y,
                   double           width,
                   double           height)
 {
   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (width <= 0 || height <= 0)
     return;

   gtk_do_render_icon (context, cr, x, y, width, height);
 }

 /**
  * gtk_render_option:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin of the rectangle
  * @y: Y origin of the rectangle
  * @width: rectangle width
  * @height: rectangle height
  *
  * Renders an option mark (as in a radio button), the %GTK_STATE_FLAG_CHECKED
  * state will determine whether the option is on or off, and
  * %GTK_STATE_FLAG_INCONSISTENT whether it should be marked as undefined.
  *
  * Typical option mark rendering:
  *
  * ![](options.png)
  **/
 void
 gtk_render_option (GtkStyleContext *context,
                    cairo_t         *cr,
                    double           x,
                    double           y,
                    double           width,
                    double           height)
 {
   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (width <= 0 || height <= 0)
     return;

   gtk_do_render_icon (context, cr, x, y, width, height);
 }

 /**
  * gtk_render_arrow:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @angle: arrow angle from 0 to 2 * %G_PI, being 0 the arrow pointing to the north
  * @x: X origin of the render area
  * @y: Y origin of the render area
  * @size: square side for render area
  *
  * Renders an arrow pointing to @angle.
  *
  * Typical arrow rendering at 0, 1⁄2 π;, π; and 3⁄2 π:
  *
  * ![](arrows.png)
  **/
 void
 gtk_render_arrow (GtkStyleContext *context,
                   cairo_t         *cr,
                   double           angle,
                   double           x,
                   double           y,
                   double           size)
 {
   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (size <= 0)
     return;

   gtk_do_render_icon (context, cr, x, y, size, size);
 }

 /**
  * gtk_render_background:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin of the rectangle
  * @y: Y origin of the rectangle
  * @width: rectangle width
  * @height: rectangle height
  *
  * Renders the background of an element.
  *
  * Typical background rendering, showing the effect of
  * `background-image`, `border-width` and `border-radius`:
  *
  * ![](background.png)
  **/
 void
 gtk_render_background (GtkStyleContext *context,
                        cairo_t         *cr,
                        double           x,
                        double           y,
                        double           width,
                        double           height)
 {
   GtkSnapshot *snapshot;
   GskRenderNode *node;

   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (width <= 0 || height <= 0)
     return;

   snapshot = gtk_snapshot_new ();
   gtk_snapshot_render_background (snapshot, context, x, y, width, height);
   node = gtk_snapshot_free_to_node (snapshot);
   if (node == NULL)
     return;

   cairo_save (cr);
   gsk_render_node_draw (node, cr);
   cairo_restore (cr);

   gsk_render_node_unref (node);
 }

 /**
  * gtk_render_frame:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin of the rectangle
  * @y: Y origin of the rectangle
  * @width: rectangle width
  * @height: rectangle height
  *
  * Renders a frame around the rectangle defined by @x, @y, @width, @height.
  *
  * Examples of frame rendering, showing the effect of `border-image`,
  * `border-color`, `border-width`, `border-radius` and junctions:
  *
  * ![](frames.png)
  **/
 void
 gtk_render_frame (GtkStyleContext *context,
                   cairo_t         *cr,
                   double           x,
                   double           y,
                   double           width,
                   double           height)
 {
   GtkSnapshot *snapshot;
   GskRenderNode *node;

   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (width <= 0 || height <= 0)
     return;

   snapshot = gtk_snapshot_new ();
   gtk_snapshot_render_frame (snapshot, context, x, y, width, height);
   node = gtk_snapshot_free_to_node (snapshot);
   if (node == NULL)
     return;

   cairo_save (cr);
   gsk_render_node_draw (node, cr);
   cairo_restore (cr);

   gsk_render_node_unref (node);
 }

 /**
  * gtk_render_expander:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin of the rectangle
  * @y: Y origin of the rectangle
  * @width: rectangle width
  * @height: rectangle height
  *
  * Renders an expander (as used in #GtkTreeView and #GtkExpander) in the area
  * defined by @x, @y, @width, @height. The state %GTK_STATE_FLAG_CHECKED
  * determines whether the expander is collapsed or expanded.
  *
  * Typical expander rendering:
  *
  * ![](expanders.png)
  **/
 void
 gtk_render_expander (GtkStyleContext *context,
                      cairo_t         *cr,
                      double           x,
                      double           y,
                      double           width,
                      double           height)
 {
   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (width <= 0 || height <= 0)
     return;

   gtk_do_render_icon (context, cr, x, y, width, height);
 }

 /**
  * gtk_render_focus:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin of the rectangle
  * @y: Y origin of the rectangle
  * @width: rectangle width
  * @height: rectangle height
  *
  * Renders a focus indicator on the rectangle determined by @x, @y, @width, @height.
  *
  * Typical focus rendering:
  *
  * ![](focus.png)
  **/
 void
 gtk_render_focus (GtkStyleContext *context,
                   cairo_t         *cr,
                   double           x,
                   double           y,
                   double           width,
                   double           height)
 {
   GtkSnapshot *snapshot;
   GskRenderNode *node;

   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (width <= 0 || height <= 0)
     return;

   snapshot = gtk_snapshot_new ();
   gtk_snapshot_render_frame (snapshot, context, x, y, width, height);
   node = gtk_snapshot_free_to_node (snapshot);
   if (node == NULL)
     return;

   cairo_save (cr);
   gsk_render_node_draw (node, cr);
   cairo_restore (cr);

   gsk_render_node_unref (node);
 }

 /**
  * gtk_render_layout:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin
  * @y: Y origin
  * @layout: the #PangoLayout to render
  *
  * Renders @layout on the coordinates @x, @y
  **/
 void
 gtk_render_layout (GtkStyleContext *context,
                    cairo_t         *cr,
                    double           x,
                    double           y,
                    PangoLayout     *layout)
 {
   GtkSnapshot *snapshot;
   GskRenderNode *node;

   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (PANGO_IS_LAYOUT (layout));
   g_return_if_fail (cr != NULL);

   snapshot = gtk_snapshot_new ();
   gtk_snapshot_render_layout (snapshot, context, x, y, layout);
   node = gtk_snapshot_free_to_node (snapshot);
   if (node == NULL)
     return;

   cairo_save (cr);
   gsk_render_node_draw (node, cr);
   cairo_restore (cr);

   gsk_render_node_unref (node);
 }

 /**
  * gtk_render_line:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x0: X coordinate for the origin of the line
  * @y0: Y coordinate for the origin of the line
  * @x1: X coordinate for the end of the line
  * @y1: Y coordinate for the end of the line
  *
  * Renders a line from (x0, y0) to (x1, y1).
  **/
 void
 gtk_render_line (GtkStyleContext *context,
                  cairo_t         *cr,
                  double           x0,
                  double           y0,
                  double           x1,
                  double           y1)
 {
   const GdkRGBA *color;

   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   cairo_save (cr);

   color = gtk_css_color_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR));

   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
   cairo_set_line_width (cr, 1);

   cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
   cairo_line_to (cr, x1 + 0.5, y1 + 0.5);

   gdk_cairo_set_source_rgba (cr, color);
   cairo_stroke (cr);

   cairo_restore (cr);
 }

 /**
  * gtk_render_handle:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin of the rectangle
  * @y: Y origin of the rectangle
  * @width: rectangle width
  * @height: rectangle height
  *
  * Renders a handle (as in #GtkPaned and
  * #GtkWindow’s resize grip), in the rectangle
  * determined by @x, @y, @width, @height.
  *
  * Handles rendered for the paned and grip classes:
  *
  * ![](handles.png)
  **/
 void
 gtk_render_handle (GtkStyleContext *context,
                    cairo_t         *cr,
                    double           x,
                    double           y,
                    double           width,
                    double           height)
 {
   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (width <= 0 || height <= 0)
     return;

   gtk_render_background (context, cr, x, y, width, height);
   gtk_render_frame (context, cr, x, y, width, height);

   gtk_do_render_icon (context, cr, x, y, width, height);
 }

 /**
  * gtk_render_activity:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @x: X origin of the rectangle
  * @y: Y origin of the rectangle
  * @width: rectangle width
  * @height: rectangle height
  *
  * Renders an activity indicator (such as in #GtkSpinner).
  * The state %GTK_STATE_FLAG_CHECKED determines whether there is
  * activity going on.
  **/
 void
 gtk_render_activity (GtkStyleContext *context,
                      cairo_t         *cr,
                      double           x,
                      double           y,
                      double           width,
                      double           height)
 {
   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
   g_return_if_fail (cr != NULL);

   if (width <= 0 || height <= 0)
     return;

   gtk_do_render_icon (context, cr, x, y, width, height);
 }

 /**
  * gtk_render_icon:
  * @context: a #GtkStyleContext
  * @cr: a #cairo_t
  * @texture: a #GdkTexture containing the icon to draw
  * @x: X position for the @texture
  * @y: Y position for the @texture
  *
  * Renders the icon in @texture at the specified @x and @y coordinates.
  *
  * This function will render the icon in @texture at exactly its size,
  * regardless of scaling factors, which may not be appropriate when
  * drawing on displays with high pixel densities.
  *
  **/
 void
 gtk_render_icon (GtkStyleContext *context,
                  cairo_t         *cr,
                  GdkTexture      *texture,
                  double           x,
                  double           y)
 {
   GtkSnapshot *snapshot;
   GskRenderNode *node;

   snapshot = gtk_snapshot_new ();
   gtk_css_style_snapshot_icon_paintable (gtk_style_context_lookup_style (context),
                                          snapshot,
                                          GDK_PAINTABLE (texture),
                                          gdk_texture_get_width (texture),
                                          gdk_texture_get_height (texture));
   node = gtk_snapshot_free_to_node (snapshot);
   if (node == NULL)
     return;

   cairo_save (cr);
   cairo_translate (cr, x, y);
   gsk_render_node_draw (node, cr);
   cairo_restore (cr);
 }
	/* GTK - The GIMP Toolkit
	* Copyright (C) 2010 Carlos Garnacho <carlosg@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, see <http://www.gnu.org/licenses/>.
	*/

	#include "config.h"

	#include "gtkrender.h"

	#include <math.h>

	#include "gtkcsscornervalueprivate.h"
	#include "gtkcssimagevalueprivate.h"
	#include "gtkcssnumbervalueprivate.h"
	#include "gtkcsscolorvalueprivate.h"
	#include "gtkcssshadowvalueprivate.h"
	#include "gtkcsstransformvalueprivate.h"
	#include "gtkrendericonprivate.h"
	#include "gtkstylecontextprivate.h"

	#include "gsk/gskroundedrectprivate.h"
	#include <gdk/gdktextureprivate.h>

	static void
	gtk_do_render_icon (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	GtkSnapshot *snapshot;
	GskRenderNode *node;

	snapshot = gtk_snapshot_new ();
	gtk_css_style_snapshot_icon (gtk_style_context_lookup_style (context), snapshot, width, height);
	node = gtk_snapshot_free_to_node (snapshot);
	if (node == NULL)
	return;

	cairo_save (cr);
	cairo_translate (cr, x, y);
	gsk_render_node_draw (node, cr);
	cairo_restore (cr);

	gsk_render_node_unref (node);
	}

	/**
	* gtk_render_check:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin of the rectangle
	* @y: Y origin of the rectangle
	* @width: rectangle width
	* @height: rectangle height
	*
	* Renders a checkmark (as in a #GtkCheckButton).
	*
	* The %GTK_STATE_FLAG_CHECKED state determines whether the check is
	* on or off, and %GTK_STATE_FLAG_INCONSISTENT determines whether it
	* should be marked as undefined.
	*
	* Typical checkmark rendering:
	*
	* ![](checks.png)
	**/
	void
	gtk_render_check (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (width <= 0 \|\| height <= 0)
	return;

	gtk_do_render_icon (context, cr, x, y, width, height);
	}

	/**
	* gtk_render_option:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin of the rectangle
	* @y: Y origin of the rectangle
	* @width: rectangle width
	* @height: rectangle height
	*
	* Renders an option mark (as in a radio button), the %GTK_STATE_FLAG_CHECKED
	* state will determine whether the option is on or off, and
	* %GTK_STATE_FLAG_INCONSISTENT whether it should be marked as undefined.
	*
	* Typical option mark rendering:
	*
	* ![](options.png)
	**/
	void
	gtk_render_option (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (width <= 0 \|\| height <= 0)
	return;

	gtk_do_render_icon (context, cr, x, y, width, height);
	}

	/**
	* gtk_render_arrow:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @angle: arrow angle from 0 to 2 * %G_PI, being 0 the arrow pointing to the north
	* @x: X origin of the render area
	* @y: Y origin of the render area
	* @size: square side for render area
	*
	* Renders an arrow pointing to @angle.
	*
	* Typical arrow rendering at 0, 1⁄2 π;, π; and 3⁄2 π:
	*
	* ![](arrows.png)
	**/
	void
	gtk_render_arrow (GtkStyleContext *context,
	cairo_t *cr,
	double angle,
	double x,
	double y,
	double size)
	{
	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (size <= 0)
	return;

	gtk_do_render_icon (context, cr, x, y, size, size);
	}

	/**
	* gtk_render_background:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin of the rectangle
	* @y: Y origin of the rectangle
	* @width: rectangle width
	* @height: rectangle height
	*
	* Renders the background of an element.
	*
	* Typical background rendering, showing the effect of
	* `background-image`, `border-width` and `border-radius`:
	*
	* ![](background.png)
	**/
	void
	gtk_render_background (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	GtkSnapshot *snapshot;
	GskRenderNode *node;

	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (width <= 0 \|\| height <= 0)
	return;

	snapshot = gtk_snapshot_new ();
	gtk_snapshot_render_background (snapshot, context, x, y, width, height);
	node = gtk_snapshot_free_to_node (snapshot);
	if (node == NULL)
	return;

	cairo_save (cr);
	gsk_render_node_draw (node, cr);
	cairo_restore (cr);

	gsk_render_node_unref (node);
	}

	/**
	* gtk_render_frame:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin of the rectangle
	* @y: Y origin of the rectangle
	* @width: rectangle width
	* @height: rectangle height
	*
	* Renders a frame around the rectangle defined by @x, @y, @width, @height.
	*
	* Examples of frame rendering, showing the effect of `border-image`,
	* `border-color`, `border-width`, `border-radius` and junctions:
	*
	* ![](frames.png)
	**/
	void
	gtk_render_frame (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	GtkSnapshot *snapshot;
	GskRenderNode *node;

	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (width <= 0 \|\| height <= 0)
	return;

	snapshot = gtk_snapshot_new ();
	gtk_snapshot_render_frame (snapshot, context, x, y, width, height);
	node = gtk_snapshot_free_to_node (snapshot);
	if (node == NULL)
	return;

	cairo_save (cr);
	gsk_render_node_draw (node, cr);
	cairo_restore (cr);

	gsk_render_node_unref (node);
	}

	/**
	* gtk_render_expander:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin of the rectangle
	* @y: Y origin of the rectangle
	* @width: rectangle width
	* @height: rectangle height
	*
	* Renders an expander (as used in #GtkTreeView and #GtkExpander) in the area
	* defined by @x, @y, @width, @height. The state %GTK_STATE_FLAG_CHECKED
	* determines whether the expander is collapsed or expanded.
	*
	* Typical expander rendering:
	*
	* ![](expanders.png)
	**/
	void
	gtk_render_expander (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (width <= 0 \|\| height <= 0)
	return;

	gtk_do_render_icon (context, cr, x, y, width, height);
	}

	/**
	* gtk_render_focus:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin of the rectangle
	* @y: Y origin of the rectangle
	* @width: rectangle width
	* @height: rectangle height
	*
	* Renders a focus indicator on the rectangle determined by @x, @y, @width, @height.
	*
	* Typical focus rendering:
	*
	* ![](focus.png)
	**/
	void
	gtk_render_focus (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	GtkSnapshot *snapshot;
	GskRenderNode *node;

	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (width <= 0 \|\| height <= 0)
	return;

	snapshot = gtk_snapshot_new ();
	gtk_snapshot_render_frame (snapshot, context, x, y, width, height);
	node = gtk_snapshot_free_to_node (snapshot);
	if (node == NULL)
	return;

	cairo_save (cr);
	gsk_render_node_draw (node, cr);
	cairo_restore (cr);

	gsk_render_node_unref (node);
	}

	/**
	* gtk_render_layout:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin
	* @y: Y origin
	* @layout: the #PangoLayout to render
	*
	* Renders @layout on the coordinates @x, @y
	**/
	void
	gtk_render_layout (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	PangoLayout *layout)
	{
	GtkSnapshot *snapshot;
	GskRenderNode *node;

	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (PANGO_IS_LAYOUT (layout));
	g_return_if_fail (cr != NULL);

	snapshot = gtk_snapshot_new ();
	gtk_snapshot_render_layout (snapshot, context, x, y, layout);
	node = gtk_snapshot_free_to_node (snapshot);
	if (node == NULL)
	return;

	cairo_save (cr);
	gsk_render_node_draw (node, cr);
	cairo_restore (cr);

	gsk_render_node_unref (node);
	}

	/**
	* gtk_render_line:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x0: X coordinate for the origin of the line
	* @y0: Y coordinate for the origin of the line
	* @x1: X coordinate for the end of the line
	* @y1: Y coordinate for the end of the line
	*
	* Renders a line from (x0, y0) to (x1, y1).
	**/
	void
	gtk_render_line (GtkStyleContext *context,
	cairo_t *cr,
	double x0,
	double y0,
	double x1,
	double y1)
	{
	const GdkRGBA *color;

	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	cairo_save (cr);

	color = gtk_css_color_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR));

	cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
	cairo_set_line_width (cr, 1);

	cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
	cairo_line_to (cr, x1 + 0.5, y1 + 0.5);

	gdk_cairo_set_source_rgba (cr, color);
	cairo_stroke (cr);

	cairo_restore (cr);
	}

	/**
	* gtk_render_handle:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin of the rectangle
	* @y: Y origin of the rectangle
	* @width: rectangle width
	* @height: rectangle height
	*
	* Renders a handle (as in #GtkPaned and
	* #GtkWindow’s resize grip), in the rectangle
	* determined by @x, @y, @width, @height.
	*
	* Handles rendered for the paned and grip classes:
	*
	* ![](handles.png)
	**/
	void
	gtk_render_handle (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (width <= 0 \|\| height <= 0)
	return;

	gtk_render_background (context, cr, x, y, width, height);
	gtk_render_frame (context, cr, x, y, width, height);

	gtk_do_render_icon (context, cr, x, y, width, height);
	}

	/**
	* gtk_render_activity:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @x: X origin of the rectangle
	* @y: Y origin of the rectangle
	* @width: rectangle width
	* @height: rectangle height
	*
	* Renders an activity indicator (such as in #GtkSpinner).
	* The state %GTK_STATE_FLAG_CHECKED determines whether there is
	* activity going on.
	**/
	void
	gtk_render_activity (GtkStyleContext *context,
	cairo_t *cr,
	double x,
	double y,
	double width,
	double height)
	{
	g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
	g_return_if_fail (cr != NULL);

	if (width <= 0 \|\| height <= 0)
	return;

	gtk_do_render_icon (context, cr, x, y, width, height);
	}

	/**
	* gtk_render_icon:
	* @context: a #GtkStyleContext
	* @cr: a #cairo_t
	* @texture: a #GdkTexture containing the icon to draw
	* @x: X position for the @texture
	* @y: Y position for the @texture
	*
	* Renders the icon in @texture at the specified @x and @y coordinates.
	*
	* This function will render the icon in @texture at exactly its size,
	* regardless of scaling factors, which may not be appropriate when
	* drawing on displays with high pixel densities.
	*
	**/
	void
	gtk_render_icon (GtkStyleContext *context,
	cairo_t *cr,
	GdkTexture *texture,
	double x,
	double y)
	{
	GtkSnapshot *snapshot;
	GskRenderNode *node;

	snapshot = gtk_snapshot_new ();
	gtk_css_style_snapshot_icon_paintable (gtk_style_context_lookup_style (context),
	snapshot,
	GDK_PAINTABLE (texture),
	gdk_texture_get_width (texture),
	gdk_texture_get_height (texture));
	node = gtk_snapshot_free_to_node (snapshot);
	if (node == NULL)
	return;

	cairo_save (cr);
	cairo_translate (cr, x, y);
	gsk_render_node_draw (node, cr);
	cairo_restore (cr);
	}