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00275dfc9f
The function gdk_cursor_new_from_pixbuf creates a cairo surface to pass to its backend implementation, but doesn't destroy it afterwards. https://bugzilla.gnome.org/show_bug.cgi?id=729670
503 lines
14 KiB
C
503 lines
14 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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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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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#define GDK_PIXBUF_ENABLE_BACKEND
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "gdkcursor.h"
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#include "gdkcursorprivate.h"
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#include "gdkdisplayprivate.h"
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#include "gdkintl.h"
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#include "gdkinternals.h"
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#include <math.h>
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#include <errno.h>
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/**
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* SECTION:cursors
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* @Short_description: Standard and pixmap cursors
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* @Title: Cursors
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*
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* These functions are used to create and destroy cursors.
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* There is a number of standard cursors, but it is also
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* possible to construct new cursors from pixbufs. There
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* may be limitations as to what kinds of cursors can be
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* constructed on a given display, see
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* gdk_display_supports_cursor_alpha(),
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* gdk_display_supports_cursor_color(),
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* gdk_display_get_default_cursor_size() and
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* gdk_display_get_maximal_cursor_size().
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*
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* Cursors by themselves are not very interesting, they must be be
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* bound to a window for users to see them. This is done with
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* gdk_window_set_cursor() or by setting the cursor member of the
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* #GdkWindowAttr passed to gdk_window_new().
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*/
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/**
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* GdkCursor:
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*
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* A #GdkCursor represents a cursor. Its contents are private.
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*/
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enum {
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PROP_0,
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PROP_CURSOR_TYPE,
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PROP_DISPLAY
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};
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G_DEFINE_ABSTRACT_TYPE (GdkCursor, gdk_cursor, G_TYPE_OBJECT)
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static void
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gdk_cursor_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GdkCursor *cursor = GDK_CURSOR (object);
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switch (prop_id)
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{
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case PROP_CURSOR_TYPE:
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g_value_set_enum (value, cursor->type);
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break;
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case PROP_DISPLAY:
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g_value_set_object (value, cursor->display);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gdk_cursor_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GdkCursor *cursor = GDK_CURSOR (object);
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switch (prop_id)
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{
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case PROP_CURSOR_TYPE:
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cursor->type = g_value_get_enum (value);
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break;
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case PROP_DISPLAY:
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cursor->display = g_value_get_object (value);
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/* check that implementations actually provide the display when constructing */
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g_assert (cursor->display != NULL);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gdk_cursor_class_init (GdkCursorClass *cursor_class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (cursor_class);
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object_class->get_property = gdk_cursor_get_property;
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object_class->set_property = gdk_cursor_set_property;
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g_object_class_install_property (object_class,
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PROP_CURSOR_TYPE,
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g_param_spec_enum ("cursor-type",
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P_("Cursor type"),
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P_("Standard cursor type"),
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GDK_TYPE_CURSOR_TYPE, GDK_X_CURSOR,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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g_object_class_install_property (object_class,
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PROP_DISPLAY,
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g_param_spec_object ("display",
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P_("Display"),
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P_("Display of this cursor"),
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GDK_TYPE_DISPLAY,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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}
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static void
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gdk_cursor_init (GdkCursor *cursor)
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{
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}
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/**
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* gdk_cursor_ref:
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* @cursor: a #GdkCursor
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*
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* Adds a reference to @cursor.
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*
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* Returns: (transfer full): Same @cursor that was passed in
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*
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* Deprecated: 3.0: Use g_object_ref() instead
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*/
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GdkCursor*
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gdk_cursor_ref (GdkCursor *cursor)
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{
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g_return_val_if_fail (cursor != NULL, NULL);
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return g_object_ref (cursor);
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}
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/**
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* gdk_cursor_unref:
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* @cursor: a #GdkCursor
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*
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* Removes a reference from @cursor, deallocating the cursor
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* if no references remain.
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*
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* Deprecated: 3.0: Use g_object_unref() instead
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*/
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void
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gdk_cursor_unref (GdkCursor *cursor)
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{
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g_return_if_fail (cursor != NULL);
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g_object_unref (cursor);
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}
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/**
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* gdk_cursor_new:
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* @cursor_type: cursor to create
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*
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* Creates a new cursor from the set of builtin cursors for the default display.
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* See gdk_cursor_new_for_display().
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*
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* To make the cursor invisible, use %GDK_BLANK_CURSOR.
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*
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* Returns: a new #GdkCursor
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*/
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GdkCursor*
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gdk_cursor_new (GdkCursorType cursor_type)
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{
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return gdk_cursor_new_for_display (gdk_display_get_default(), cursor_type);
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}
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/**
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* gdk_cursor_get_cursor_type:
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* @cursor: a #GdkCursor
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*
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* Returns the cursor type for this cursor.
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*
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* Returns: a #GdkCursorType
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*
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* Since: 2.22
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**/
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GdkCursorType
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gdk_cursor_get_cursor_type (GdkCursor *cursor)
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{
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g_return_val_if_fail (cursor != NULL, GDK_BLANK_CURSOR);
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return cursor->type;
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}
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/**
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* gdk_cursor_new_for_display:
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* @display: the #GdkDisplay for which the cursor will be created
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* @cursor_type: cursor to create
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*
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* Creates a new cursor from the set of builtin cursors.
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* Some useful ones are:
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* -  #GDK_RIGHT_PTR (right-facing arrow)
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* -  #GDK_CROSSHAIR (crosshair)
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* -  #GDK_XTERM (I-beam)
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* -  #GDK_WATCH (busy)
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* -  #GDK_FLEUR (for moving objects)
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* -  #GDK_HAND1 (a right-pointing hand)
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* -  #GDK_HAND2 (a left-pointing hand)
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* -  #GDK_LEFT_SIDE (resize left side)
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* -  #GDK_RIGHT_SIDE (resize right side)
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* -  #GDK_TOP_LEFT_CORNER (resize northwest corner)
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* -  #GDK_TOP_RIGHT_CORNER (resize northeast corner)
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* -  #GDK_BOTTOM_LEFT_CORNER (resize southwest corner)
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* -  #GDK_BOTTOM_RIGHT_CORNER (resize southeast corner)
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* -  #GDK_TOP_SIDE (resize top side)
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* -  #GDK_BOTTOM_SIDE (resize bottom side)
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* -  #GDK_SB_H_DOUBLE_ARROW (move vertical splitter)
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* -  #GDK_SB_V_DOUBLE_ARROW (move horizontal splitter)
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* - #GDK_BLANK_CURSOR (Blank cursor). Since 2.16
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*
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* Returns: a new #GdkCursor
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*
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* Since: 2.2
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**/
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GdkCursor*
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gdk_cursor_new_for_display (GdkDisplay *display,
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GdkCursorType cursor_type)
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{
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g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
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return GDK_DISPLAY_GET_CLASS (display)->get_cursor_for_type (display, cursor_type);
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}
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/**
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* gdk_cursor_new_from_name:
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* @display: the #GdkDisplay for which the cursor will be created
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* @name: the name of the cursor
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*
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* Creates a new cursor by looking up @name in the current cursor
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* theme.
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*
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* Returns: a new #GdkCursor, or %NULL if there is no cursor with
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* the given name
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*
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* Since: 2.8
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*/
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GdkCursor*
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gdk_cursor_new_from_name (GdkDisplay *display,
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const gchar *name)
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{
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g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
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return GDK_DISPLAY_GET_CLASS (display)->get_cursor_for_name (display, name);
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}
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/**
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* gdk_cursor_new_from_pixbuf:
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* @display: the #GdkDisplay for which the cursor will be created
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* @pixbuf: the #GdkPixbuf containing the cursor image
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* @x: the horizontal offset of the “hotspot” of the cursor.
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* @y: the vertical offset of the “hotspot” of the cursor.
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*
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* Creates a new cursor from a pixbuf.
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*
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* Not all GDK backends support RGBA cursors. If they are not
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* supported, a monochrome approximation will be displayed.
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* The functions gdk_display_supports_cursor_alpha() and
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* gdk_display_supports_cursor_color() can be used to determine
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* whether RGBA cursors are supported;
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* gdk_display_get_default_cursor_size() and
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* gdk_display_get_maximal_cursor_size() give information about
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* cursor sizes.
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*
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* If @x or @y are `-1`, the pixbuf must have
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* options named “x_hot” and “y_hot”, resp., containing
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* integer values between `0` and the width resp. height of
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* the pixbuf. (Since: 3.0)
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*
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* On the X backend, support for RGBA cursors requires a
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* sufficently new version of the X Render extension.
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*
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* Returns: a new #GdkCursor.
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*
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* Since: 2.4
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*/
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GdkCursor *
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gdk_cursor_new_from_pixbuf (GdkDisplay *display,
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GdkPixbuf *pixbuf,
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gint x,
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gint y)
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{
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cairo_surface_t *surface;
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const char *option;
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char *end;
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gint64 value;
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GdkCursor *cursor;
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g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
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g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
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if (x == -1 && (option = gdk_pixbuf_get_option (pixbuf, "x_hot")))
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{
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errno = 0;
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end = NULL;
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value = g_ascii_strtoll (option, &end, 10);
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if (errno == 0 &&
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end != option &&
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value >= 0 && value < G_MAXINT)
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x = (gint) value;
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}
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if (y == -1 && (option = gdk_pixbuf_get_option (pixbuf, "y_hot")))
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{
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errno = 0;
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end = NULL;
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value = g_ascii_strtoll (option, &end, 10);
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if (errno == 0 &&
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end != option &&
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value >= 0 && value < G_MAXINT)
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y = (gint) value;
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}
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surface = gdk_cairo_surface_create_from_pixbuf (pixbuf, 1, NULL);
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cursor = GDK_DISPLAY_GET_CLASS (display)->get_cursor_for_surface (display, surface, x, y);
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cairo_surface_destroy (surface);
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return cursor;
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}
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/**
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* gdk_cursor_new_from_surface:
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* @display: the #GdkDisplay for which the cursor will be created
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* @surface: the cairo image surface containing the cursor pixel data
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* @x: the horizontal offset of the “hotspot” of the cursor
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* @y: the vertical offset of the “hotspot” of the cursor
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*
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* Creates a new cursor from a cairo image surface.
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*
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* Not all GDK backends support RGBA cursors. If they are not
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* supported, a monochrome approximation will be displayed.
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* The functions gdk_display_supports_cursor_alpha() and
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* gdk_display_supports_cursor_color() can be used to determine
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* whether RGBA cursors are supported;
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* gdk_display_get_default_cursor_size() and
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* gdk_display_get_maximal_cursor_size() give information about
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* cursor sizes.
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*
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* On the X backend, support for RGBA cursors requires a
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* sufficently new version of the X Render extension.
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*
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* Returns: a new #GdkCursor.
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*
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* Since: 3.10
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*/
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GdkCursor *
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gdk_cursor_new_from_surface (GdkDisplay *display,
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cairo_surface_t *surface,
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gdouble x,
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gdouble y)
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{
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g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
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g_return_val_if_fail (surface != NULL, NULL);
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g_return_val_if_fail (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE, NULL);
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g_return_val_if_fail (0 <= x && x < cairo_image_surface_get_width (surface), NULL);
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g_return_val_if_fail (0 <= y && y < cairo_image_surface_get_height (surface), NULL);
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return GDK_DISPLAY_GET_CLASS (display)->get_cursor_for_surface (display,
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surface, x, y);
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}
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/**
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* gdk_cursor_get_display:
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* @cursor: a #GdkCursor.
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*
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* Returns the display on which the #GdkCursor is defined.
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*
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* Returns: (transfer none): the #GdkDisplay associated to @cursor
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*
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* Since: 2.2
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*/
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GdkDisplay *
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gdk_cursor_get_display (GdkCursor *cursor)
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{
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g_return_val_if_fail (GDK_IS_CURSOR (cursor), NULL);
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return cursor->display;
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}
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/**
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* gdk_cursor_get_image:
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* @cursor: a #GdkCursor
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*
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* Returns a #GdkPixbuf with the image used to display the cursor.
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*
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* Note that depending on the capabilities of the windowing system and
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* on the cursor, GDK may not be able to obtain the image data. In this
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* case, %NULL is returned.
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*
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* Returns: (transfer full): a #GdkPixbuf representing @cursor, or %NULL
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*
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* Since: 2.8
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*/
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GdkPixbuf*
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gdk_cursor_get_image (GdkCursor *cursor)
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{
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int w, h;
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cairo_surface_t *surface;
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GdkPixbuf *pixbuf;
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gchar buf[32];
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double x_hot, y_hot;
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double x_scale, y_scale;
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g_return_val_if_fail (GDK_IS_CURSOR (cursor), NULL);
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surface = gdk_cursor_get_surface (cursor, &x_hot, &y_hot);
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if (surface == NULL)
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return NULL;
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w = cairo_image_surface_get_width (surface);
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h = cairo_image_surface_get_height (surface);
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x_scale = y_scale = 1;
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#ifdef HAVE_CAIRO_SURFACE_SET_DEVICE_SCALE
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cairo_surface_get_device_scale (surface, &x_scale, &y_scale);
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#endif
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pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, w, h);
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cairo_surface_destroy (surface);
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if (x_scale != 1)
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{
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GdkPixbuf *old;
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old = pixbuf;
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pixbuf = gdk_pixbuf_scale_simple (old,
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w / x_scale, h / y_scale,
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GDK_INTERP_HYPER);
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g_object_unref (old);
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}
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g_snprintf (buf, 32, "%d", (int)x_hot);
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gdk_pixbuf_set_option (pixbuf, "x_hot", buf);
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g_snprintf (buf, 32, "%d", (int)y_hot);
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gdk_pixbuf_set_option (pixbuf, "y_hot", buf);
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return pixbuf;
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}
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/**
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* gdk_cursor_get_surface:
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* @cursor: a #GdkCursor
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* @x_hot: Location to store the hotspot x position, or %NULL
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* @y_hot: Location to store the hotspot y position, or %NULL
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*
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* Returns a cairo image surface with the image used to display the cursor.
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*
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* Note that depending on the capabilities of the windowing system and
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* on the cursor, GDK may not be able to obtain the image data. In this
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* case, %NULL is returned.
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*
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* Returns: (transfer full): a #cairo_surface_t representing @cursor, or %NULL
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*
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* Since: 3.10
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*/
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cairo_surface_t *
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gdk_cursor_get_surface (GdkCursor *cursor,
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gdouble *x_hot,
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gdouble *y_hot)
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{
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g_return_val_if_fail (GDK_IS_CURSOR (cursor), NULL);
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return GDK_CURSOR_GET_CLASS (cursor)->get_surface (cursor, x_hot, y_hot);
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}
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