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517 lines
14 KiB
C
517 lines
14 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkrender.h"
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#include <math.h>
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#include "gtkcsscornervalueprivate.h"
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#include "gtkcssimagevalueprivate.h"
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#include "gtkcssnumbervalueprivate.h"
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#include "gtkcsscolorvalueprivate.h"
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#include "gtkcssshadowvalueprivate.h"
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#include "gtkcsstransformvalueprivate.h"
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#include "gtkrendericonprivate.h"
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#include "gtkstylecontextprivate.h"
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#include "gsk/gskroundedrectprivate.h"
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#include <gdk/gdktextureprivate.h>
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static void
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gtk_do_render_icon (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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GtkSnapshot *snapshot;
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GskRenderNode *node;
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snapshot = gtk_snapshot_new ();
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gtk_css_style_snapshot_icon (gtk_style_context_lookup_style (context), snapshot, width, height);
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node = gtk_snapshot_free_to_node (snapshot);
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if (node == NULL)
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return;
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cairo_save (cr);
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cairo_translate (cr, x, y);
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gsk_render_node_draw (node, cr);
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cairo_restore (cr);
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gsk_render_node_unref (node);
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}
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/**
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* gtk_render_check:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin of the rectangle
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* @y: Y origin of the rectangle
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* @width: rectangle width
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* @height: rectangle height
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*
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* Renders a checkmark (as in a `GtkCheckButton`).
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*
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* The %GTK_STATE_FLAG_CHECKED state determines whether the check is
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* on or off, and %GTK_STATE_FLAG_INCONSISTENT determines whether it
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* should be marked as undefined.
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*
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* Typical checkmark rendering:
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*
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* 
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**/
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void
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gtk_render_check (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (width <= 0 || height <= 0)
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return;
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gtk_do_render_icon (context, cr, x, y, width, height);
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}
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/**
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* gtk_render_option:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin of the rectangle
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* @y: Y origin of the rectangle
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* @width: rectangle width
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* @height: rectangle height
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*
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* Renders an option mark (as in a radio button), the %GTK_STATE_FLAG_CHECKED
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* state will determine whether the option is on or off, and
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* %GTK_STATE_FLAG_INCONSISTENT whether it should be marked as undefined.
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*
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* Typical option mark rendering:
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*
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* 
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**/
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void
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gtk_render_option (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (width <= 0 || height <= 0)
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return;
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gtk_do_render_icon (context, cr, x, y, width, height);
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}
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/**
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* gtk_render_arrow:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @angle: arrow angle from 0 to 2 * %G_PI, being 0 the arrow pointing to the north
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* @x: X origin of the render area
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* @y: Y origin of the render area
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* @size: square side for render area
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*
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* Renders an arrow pointing to @angle.
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*
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* Typical arrow rendering at 0, 1⁄2 π;, π; and 3⁄2 π:
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*
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* 
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**/
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void
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gtk_render_arrow (GtkStyleContext *context,
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cairo_t *cr,
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double angle,
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double x,
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double y,
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double size)
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{
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (size <= 0)
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return;
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gtk_do_render_icon (context, cr, x, y, size, size);
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}
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/**
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* gtk_render_background:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin of the rectangle
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* @y: Y origin of the rectangle
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* @width: rectangle width
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* @height: rectangle height
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*
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* Renders the background of an element.
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*
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* Typical background rendering, showing the effect of
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* `background-image`, `border-width` and `border-radius`:
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*
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* 
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**/
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void
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gtk_render_background (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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GtkSnapshot *snapshot;
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GskRenderNode *node;
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (width <= 0 || height <= 0)
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return;
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snapshot = gtk_snapshot_new ();
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gtk_snapshot_render_background (snapshot, context, x, y, width, height);
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node = gtk_snapshot_free_to_node (snapshot);
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if (node == NULL)
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return;
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cairo_save (cr);
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gsk_render_node_draw (node, cr);
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cairo_restore (cr);
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gsk_render_node_unref (node);
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}
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/**
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* gtk_render_frame:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin of the rectangle
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* @y: Y origin of the rectangle
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* @width: rectangle width
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* @height: rectangle height
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*
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* Renders a frame around the rectangle defined by @x, @y, @width, @height.
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*
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* Examples of frame rendering, showing the effect of `border-image`,
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* `border-color`, `border-width`, `border-radius` and junctions:
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*
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* 
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**/
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void
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gtk_render_frame (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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GtkSnapshot *snapshot;
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GskRenderNode *node;
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (width <= 0 || height <= 0)
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return;
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snapshot = gtk_snapshot_new ();
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gtk_snapshot_render_frame (snapshot, context, x, y, width, height);
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node = gtk_snapshot_free_to_node (snapshot);
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if (node == NULL)
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return;
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cairo_save (cr);
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gsk_render_node_draw (node, cr);
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cairo_restore (cr);
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gsk_render_node_unref (node);
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}
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/**
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* gtk_render_expander:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin of the rectangle
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* @y: Y origin of the rectangle
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* @width: rectangle width
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* @height: rectangle height
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*
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* Renders an expander (as used in `GtkTreeView` and `GtkExpander`) in the area
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* defined by @x, @y, @width, @height. The state %GTK_STATE_FLAG_CHECKED
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* determines whether the expander is collapsed or expanded.
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*
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* Typical expander rendering:
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*
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* 
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**/
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void
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gtk_render_expander (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (width <= 0 || height <= 0)
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return;
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gtk_do_render_icon (context, cr, x, y, width, height);
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}
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/**
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* gtk_render_focus:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin of the rectangle
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* @y: Y origin of the rectangle
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* @width: rectangle width
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* @height: rectangle height
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*
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* Renders a focus indicator on the rectangle determined by @x, @y, @width, @height.
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*
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* Typical focus rendering:
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*
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* 
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**/
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void
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gtk_render_focus (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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GtkSnapshot *snapshot;
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GskRenderNode *node;
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (width <= 0 || height <= 0)
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return;
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snapshot = gtk_snapshot_new ();
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gtk_snapshot_render_frame (snapshot, context, x, y, width, height);
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node = gtk_snapshot_free_to_node (snapshot);
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if (node == NULL)
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return;
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cairo_save (cr);
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gsk_render_node_draw (node, cr);
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cairo_restore (cr);
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gsk_render_node_unref (node);
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}
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/**
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* gtk_render_layout:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin
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* @y: Y origin
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* @layout: the `PangoLayout` to render
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*
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* Renders @layout on the coordinates @x, @y
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**/
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void
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gtk_render_layout (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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PangoLayout *layout)
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{
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GtkSnapshot *snapshot;
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GskRenderNode *node;
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (PANGO_IS_LAYOUT (layout));
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g_return_if_fail (cr != NULL);
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snapshot = gtk_snapshot_new ();
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gtk_snapshot_render_layout (snapshot, context, x, y, layout);
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node = gtk_snapshot_free_to_node (snapshot);
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if (node == NULL)
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return;
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cairo_save (cr);
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gsk_render_node_draw (node, cr);
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cairo_restore (cr);
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gsk_render_node_unref (node);
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}
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/**
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* gtk_render_line:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x0: X coordinate for the origin of the line
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* @y0: Y coordinate for the origin of the line
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* @x1: X coordinate for the end of the line
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* @y1: Y coordinate for the end of the line
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*
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* Renders a line from (x0, y0) to (x1, y1).
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**/
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void
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gtk_render_line (GtkStyleContext *context,
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cairo_t *cr,
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double x0,
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double y0,
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double x1,
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double y1)
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{
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const GdkRGBA *color;
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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cairo_save (cr);
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color = gtk_css_color_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR));
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
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cairo_set_line_width (cr, 1);
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cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
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cairo_line_to (cr, x1 + 0.5, y1 + 0.5);
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gdk_cairo_set_source_rgba (cr, color);
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cairo_stroke (cr);
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cairo_restore (cr);
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}
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/**
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* gtk_render_handle:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin of the rectangle
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* @y: Y origin of the rectangle
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* @width: rectangle width
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* @height: rectangle height
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*
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* Renders a handle (as in `GtkPaned` and `GtkWindow`’s resize grip),
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* in the rectangle determined by @x, @y, @width, @height.
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*
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* Handles rendered for the paned and grip classes:
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*
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* 
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**/
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void
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gtk_render_handle (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (width <= 0 || height <= 0)
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return;
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gtk_render_background (context, cr, x, y, width, height);
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gtk_render_frame (context, cr, x, y, width, height);
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gtk_do_render_icon (context, cr, x, y, width, height);
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}
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/**
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* gtk_render_activity:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @x: X origin of the rectangle
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* @y: Y origin of the rectangle
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* @width: rectangle width
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* @height: rectangle height
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*
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* Renders an activity indicator (such as in `GtkSpinner`).
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* The state %GTK_STATE_FLAG_CHECKED determines whether there is
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* activity going on.
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**/
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void
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gtk_render_activity (GtkStyleContext *context,
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cairo_t *cr,
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double x,
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double y,
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double width,
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double height)
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{
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (cr != NULL);
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if (width <= 0 || height <= 0)
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return;
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gtk_do_render_icon (context, cr, x, y, width, height);
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}
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/**
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* gtk_render_icon:
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* @context: a `GtkStyleContext`
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* @cr: a `cairo_t`
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* @texture: a `GdkTexture` containing the icon to draw
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* @x: X position for the @texture
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* @y: Y position for the @texture
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*
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* Renders the icon in @texture at the specified @x and @y coordinates.
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*
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* This function will render the icon in @texture at exactly its size,
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* regardless of scaling factors, which may not be appropriate when
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* drawing on displays with high pixel densities.
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*
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**/
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void
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gtk_render_icon (GtkStyleContext *context,
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cairo_t *cr,
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GdkTexture *texture,
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double x,
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double y)
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{
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GtkSnapshot *snapshot;
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GskRenderNode *node;
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snapshot = gtk_snapshot_new ();
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gtk_css_style_snapshot_icon_paintable (gtk_style_context_lookup_style (context),
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snapshot,
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GDK_PAINTABLE (texture),
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gdk_texture_get_width (texture),
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gdk_texture_get_height (texture));
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node = gtk_snapshot_free_to_node (snapshot);
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if (node == NULL)
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return;
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cairo_save (cr);
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cairo_translate (cr, x, y);
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gsk_render_node_draw (node, cr);
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cairo_restore (cr);
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}
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