mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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9cfd92ef66
* gdk/gdkdraw.c: Added a check on the colormap depth to
gdk_drawable_set_colormap()
* gdk/x11/gdkimage-x11.c: combination of Mathias Hasselmann's
patch to fix colorsel and my patch to fix gdk_drawable_get_image()
for pixmaps without visuals (more specifically, bitmaps)
* gdk/x11/gdkpixmap-x11.c: Fixed gdk_pixmap_new() so it
doesn't set a colormap with the wrong depth
728 lines
20 KiB
C
728 lines
20 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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 "gdkdrawable.h"
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#include "gdkinternals.h"
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#include "gdkwindow.h"
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static GdkDrawable* gdk_drawable_real_get_composite_drawable (GdkDrawable *drawable,
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gint x,
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gint y,
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gint width,
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gint height,
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gint *composite_x_offset,
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gint *composite_y_offset);
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static GdkRegion * gdk_drawable_real_get_visible_region (GdkDrawable *drawable);
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static void gdk_drawable_class_init (GdkDrawableClass *klass);
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GType
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gdk_drawable_get_type (void)
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{
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static GType object_type = 0;
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if (!object_type)
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{
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static const GTypeInfo object_info =
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{
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sizeof (GdkDrawableClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gdk_drawable_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GdkDrawable),
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0, /* n_preallocs */
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(GInstanceInitFunc) NULL,
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};
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object_type = g_type_register_static (G_TYPE_OBJECT,
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"GdkDrawable",
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&object_info, 0);
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}
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return object_type;
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}
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static void
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gdk_drawable_class_init (GdkDrawableClass *klass)
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{
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klass->get_composite_drawable = gdk_drawable_real_get_composite_drawable;
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/* Default implementation for clip and visible region is the same */
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klass->get_clip_region = gdk_drawable_real_get_visible_region;
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klass->get_visible_region = gdk_drawable_real_get_visible_region;
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}
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/* Manipulation of drawables
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*/
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/**
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* gdk_drawable_set_data:
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* @drawable: a #GdkDrawable
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* @key: name to store the data under
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* @data: arbitrary data
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* @destroy_func: function to free @data, or %NULL
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*
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* This function is equivalent to g_object_set_data(),
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* the #GObject variant should be used instead.
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*
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**/
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void
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gdk_drawable_set_data (GdkDrawable *drawable,
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const gchar *key,
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gpointer data,
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GDestroyNotify destroy_func)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_object_set_qdata_full (G_OBJECT (drawable),
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g_quark_from_string (key),
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data,
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destroy_func);
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}
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/**
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* gdk_drawable_get_data:
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* @drawable: a #GdkDrawable
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* @key: name the data was stored under
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*
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* Equivalent to g_object_get_data(); the #GObject variant should be
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* used instead.
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*
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* Return value: the data stored at @key
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**/
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gpointer
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gdk_drawable_get_data (GdkDrawable *drawable,
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const gchar *key)
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{
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g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
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return g_object_get_qdata (G_OBJECT (drawable),
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g_quark_try_string (key));
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}
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/**
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* gdk_drawable_get_size:
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* @drawable: a #GdkDrawable
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* @width: location to store drawable's width, or %NULL
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* @height: location to store drawable's height, or %NULL
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*
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* Fills *@width and *@height with the size of @drawable.
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* @width or @height can be %NULL if you only want the other one.
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*
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**/
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void
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gdk_drawable_get_size (GdkDrawable *drawable,
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gint *width,
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gint *height)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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GDK_DRAWABLE_GET_CLASS (drawable)->get_size (drawable, width, height);
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}
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/**
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* gdk_drawable_get_visual:
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* @drawable: a #GdkDrawable
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*
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* Gets the #GdkVisual describing the pixel format of @drawable.
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*
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* Return value: a #GdkVisual
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**/
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GdkVisual*
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gdk_drawable_get_visual (GdkDrawable *drawable)
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{
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g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
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return GDK_DRAWABLE_GET_CLASS (drawable)->get_visual (drawable);
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}
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/**
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* gdk_drawable_get_depth:
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* @drawable: a #GdkDrawable
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*
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* Obtains the bit depth of the drawable, that is, the number of bits
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* that make up a pixel in the drawable's visual. Examples are 8 bits
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* per pixel, 24 bits per pixel, etc.
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*
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* Return value: number of bits per pixel
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**/
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gint
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gdk_drawable_get_depth (GdkDrawable *drawable)
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{
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g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), 0);
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return GDK_DRAWABLE_GET_CLASS (drawable)->get_depth (drawable);
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}
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/**
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* gdk_drawable_set_colormap:
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* @drawable: a #GdkDrawable
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* @colormap: a #GdkColormap
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*
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* Sets the colormap associated with @drawable. Normally this will
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* happen automatically when the drawable is created; you only need to
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* use this function if the drawable-creating function did not have a
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* way to determine the colormap, and you then use drawable operations
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* that require a colormap. The colormap for all drawables and
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* graphics contexts you intend to use together should match. i.e.
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* when using a #GdkGC to draw to a drawable, or copying one drawable
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* to another, the colormaps should match.
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*
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**/
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void
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gdk_drawable_set_colormap (GdkDrawable *drawable,
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GdkColormap *cmap)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (cmap == NULL || gdk_drawable_get_depth (drawable)
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== cmap->visual->depth);
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GDK_DRAWABLE_GET_CLASS (drawable)->set_colormap (drawable, cmap);
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}
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/**
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* gdk_drawable_get_colormap:
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* @drawable: a #GdkDrawable
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*
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* Gets the colormap for @drawable, if one is set; returns
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* %NULL otherwise.
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*
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* Return value: the colormap, or %NULL
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**/
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GdkColormap*
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gdk_drawable_get_colormap (GdkDrawable *drawable)
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{
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g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
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return GDK_DRAWABLE_GET_CLASS (drawable)->get_colormap (drawable);
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}
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/**
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* gdk_drawable_ref:
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* @drawable: a #GdkDrawable
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*
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* Deprecated equivalent of calling g_object_ref() on @drawable.
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* (Drawables were not objects in previous versions of GDK.)
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*
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* Return value: the same @drawable passed in
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**/
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GdkDrawable*
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gdk_drawable_ref (GdkDrawable *drawable)
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{
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return (GdkDrawable *) g_object_ref (G_OBJECT (drawable));
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}
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/**
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* gdk_drawable_unref:
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* @drawable: a #GdkDrawable
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*
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* Deprecated equivalent of calling g_object_unref() on @drawable.
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*
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**/
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void
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gdk_drawable_unref (GdkDrawable *drawable)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_object_unref (G_OBJECT (drawable));
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}
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/* Drawing
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*/
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void
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gdk_draw_point (GdkDrawable *drawable,
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GdkGC *gc,
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gint x,
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gint y)
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{
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GdkPoint point;
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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point.x = x;
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point.y = y;
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_points (drawable, gc, &point, 1);
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}
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void
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gdk_draw_line (GdkDrawable *drawable,
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GdkGC *gc,
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gint x1,
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gint y1,
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gint x2,
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gint y2)
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{
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GdkSegment segment;
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g_return_if_fail (drawable != NULL);
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g_return_if_fail (gc != NULL);
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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segment.x1 = x1;
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segment.y1 = y1;
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segment.x2 = x2;
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segment.y2 = y2;
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_segments (drawable, gc, &segment, 1);
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}
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void
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gdk_draw_rectangle (GdkDrawable *drawable,
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GdkGC *gc,
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gint filled,
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gint x,
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gint y,
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gint width,
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gint height)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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if (width < 0 || height < 0)
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{
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gint real_width;
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gint real_height;
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gdk_drawable_get_size (drawable, &real_width, &real_height);
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if (width < 0)
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width = real_width;
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if (height < 0)
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height = real_height;
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}
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_rectangle (drawable, gc, filled, x, y,
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width, height);
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}
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void
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gdk_draw_arc (GdkDrawable *drawable,
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GdkGC *gc,
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gint filled,
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gint x,
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gint y,
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gint width,
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gint height,
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gint angle1,
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gint angle2)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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if (width < 0 || height < 0)
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{
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gint real_width;
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gint real_height;
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gdk_drawable_get_size (drawable, &real_width, &real_height);
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if (width < 0)
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width = real_width;
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if (height < 0)
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height = real_height;
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}
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_arc (drawable, gc, filled,
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x, y, width, height, angle1, angle2);
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}
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void
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gdk_draw_polygon (GdkDrawable *drawable,
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GdkGC *gc,
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gint filled,
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GdkPoint *points,
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gint npoints)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (GDK_IS_GC (gc));
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_polygon (drawable, gc, filled,
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points, npoints);
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}
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/* gdk_draw_string
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*
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* Modified by Li-Da Lho to draw 16 bits and Multibyte strings
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*
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* Interface changed: add "GdkFont *font" to specify font or fontset explicitely
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*/
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void
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gdk_draw_string (GdkDrawable *drawable,
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GdkFont *font,
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GdkGC *gc,
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gint x,
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gint y,
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const gchar *string)
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{
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gdk_draw_text (drawable, font, gc, x, y, string, _gdk_font_strlen (font, string));
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}
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/* gdk_draw_text
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*
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* Modified by Li-Da Lho to draw 16 bits and Multibyte strings
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*
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* Interface changed: add "GdkFont *font" to specify font or fontset explicitely
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*/
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void
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gdk_draw_text (GdkDrawable *drawable,
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GdkFont *font,
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GdkGC *gc,
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gint x,
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gint y,
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const gchar *text,
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gint text_length)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (font != NULL);
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g_return_if_fail (GDK_IS_GC (gc));
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g_return_if_fail (text != NULL);
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_text (drawable, font, gc, x, y, text, text_length);
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}
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void
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gdk_draw_text_wc (GdkDrawable *drawable,
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GdkFont *font,
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GdkGC *gc,
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gint x,
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gint y,
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const GdkWChar *text,
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gint text_length)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (font != NULL);
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g_return_if_fail (GDK_IS_GC (gc));
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g_return_if_fail (text != NULL);
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_text_wc (drawable, font, gc, x, y, text, text_length);
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}
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void
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gdk_draw_drawable (GdkDrawable *drawable,
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GdkGC *gc,
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GdkDrawable *src,
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gint xsrc,
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gint ysrc,
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gint xdest,
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gint ydest,
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gint width,
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gint height)
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{
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GdkDrawable *composite;
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gint composite_x_offset = 0;
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gint composite_y_offset = 0;
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (src != NULL);
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g_return_if_fail (GDK_IS_GC (gc));
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if (width < 0 || height < 0)
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{
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gint real_width;
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gint real_height;
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gdk_drawable_get_size (src, &real_width, &real_height);
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if (width < 0)
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width = real_width;
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if (height < 0)
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height = real_height;
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}
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composite =
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GDK_DRAWABLE_GET_CLASS (src)->get_composite_drawable (src,
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xsrc, ysrc,
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width, height,
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&composite_x_offset,
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&composite_y_offset);
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_drawable (drawable, gc, composite,
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xsrc - composite_x_offset,
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ysrc - composite_y_offset,
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xdest, ydest,
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width, height);
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g_object_unref (G_OBJECT (composite));
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}
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void
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gdk_draw_image (GdkDrawable *drawable,
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GdkGC *gc,
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GdkImage *image,
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gint xsrc,
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gint ysrc,
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gint xdest,
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gint ydest,
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gint width,
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gint height)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail (image != NULL);
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g_return_if_fail (GDK_IS_GC (gc));
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if (width == -1)
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width = image->width;
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if (height == -1)
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height = image->height;
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_image (drawable, gc, image, xsrc, ysrc,
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xdest, ydest, width, height);
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}
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void
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gdk_draw_points (GdkDrawable *drawable,
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GdkGC *gc,
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GdkPoint *points,
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gint npoints)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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g_return_if_fail ((points != NULL) && (npoints > 0));
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g_return_if_fail (GDK_IS_GC (gc));
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g_return_if_fail (npoints >= 0);
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if (npoints == 0)
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return;
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GDK_DRAWABLE_GET_CLASS (drawable)->draw_points (drawable, gc, points, npoints);
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}
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void
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gdk_draw_segments (GdkDrawable *drawable,
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GdkGC *gc,
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GdkSegment *segs,
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gint nsegs)
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{
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g_return_if_fail (GDK_IS_DRAWABLE (drawable));
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if (nsegs == 0)
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return;
|
|
|
|
g_return_if_fail (segs != NULL);
|
|
g_return_if_fail (GDK_IS_GC (gc));
|
|
g_return_if_fail (nsegs >= 0);
|
|
|
|
GDK_DRAWABLE_GET_CLASS (drawable)->draw_segments (drawable, gc, segs, nsegs);
|
|
}
|
|
|
|
void
|
|
gdk_draw_lines (GdkDrawable *drawable,
|
|
GdkGC *gc,
|
|
GdkPoint *points,
|
|
gint npoints)
|
|
{
|
|
|
|
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
|
|
g_return_if_fail (points != NULL);
|
|
g_return_if_fail (GDK_IS_GC (gc));
|
|
g_return_if_fail (npoints >= 0);
|
|
|
|
if (npoints == 0)
|
|
return;
|
|
|
|
GDK_DRAWABLE_GET_CLASS (drawable)->draw_lines (drawable, gc, points, npoints);
|
|
}
|
|
|
|
void
|
|
gdk_draw_glyphs (GdkDrawable *drawable,
|
|
GdkGC *gc,
|
|
PangoFont *font,
|
|
gint x,
|
|
gint y,
|
|
PangoGlyphString *glyphs)
|
|
{
|
|
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
|
|
g_return_if_fail (GDK_IS_GC (gc));
|
|
|
|
|
|
GDK_DRAWABLE_GET_CLASS (drawable)->draw_glyphs (drawable, gc, font, x, y, glyphs);
|
|
}
|
|
|
|
|
|
/**
|
|
* gdk_drawable_get_image:
|
|
* @drawable: a #GdkDrawable
|
|
* @x: x coordinate on @drawable
|
|
* @y: y coordinate on @drawable
|
|
* @width: width of region to get
|
|
* @height: height or region to get
|
|
*
|
|
* A #GdkImage stores client-side image data (pixels). In contrast,
|
|
* #GdkPixmap and #GdkWindow are server-side
|
|
* objects. gdk_drawable_get_image() obtains the pixels from a
|
|
* server-side drawable as a client-side #GdkImage. The format of a
|
|
* #GdkImage depends on the #GdkVisual of the current display, which
|
|
* makes manipulating #GdkImage extremely difficult; therefore, in
|
|
* most cases you should use gdk_pixbuf_get_from_drawable() instead of
|
|
* this lower-level function. A #GdkPixbuf contains image data in a
|
|
* canonicalized RGB format, rather than a display-dependent format.
|
|
* Of course, there's a convenience vs. speed tradeoff here, so you'll
|
|
* want to think about what makes sense for your application.
|
|
*
|
|
* @x, @y, @width, and @height define the region of @drawable to
|
|
* obtain as an image.
|
|
*
|
|
* You would usually copy image data to the client side if you intend
|
|
* to examine the values of individual pixels, for example to darken
|
|
* an image or add a red tint. It would be prohibitively slow to
|
|
* make a round-trip request to the windowing system for each pixel,
|
|
* so instead you get all of them at once, modify them, then copy
|
|
* them all back at once.
|
|
*
|
|
* If the X server or other windowing system backend is on the local
|
|
* machine, this function may use shared memory to avoid copying
|
|
* the image data.
|
|
*
|
|
* If the source drawable is a #GdkWindow and partially offscreen
|
|
* or obscured, then the obscured portions of the returned image
|
|
* will contain undefined data.
|
|
*
|
|
* Return value: a #GdkImage containing the contents of @drawable
|
|
**/
|
|
GdkImage*
|
|
gdk_drawable_get_image (GdkDrawable *drawable,
|
|
gint x,
|
|
gint y,
|
|
gint width,
|
|
gint height)
|
|
{
|
|
GdkDrawable *composite;
|
|
gint composite_x_offset = 0;
|
|
gint composite_y_offset = 0;
|
|
GdkImage *retval;
|
|
GdkColormap *cmap;
|
|
|
|
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
|
|
g_return_val_if_fail (x >= 0, NULL);
|
|
g_return_val_if_fail (y >= 0, NULL);
|
|
|
|
/* FIXME? Note race condition since we get the size then
|
|
* get the image, and the size may have changed.
|
|
*/
|
|
|
|
if (width < 0 || height < 0)
|
|
gdk_drawable_get_size (drawable,
|
|
width < 0 ? &width : NULL,
|
|
height < 0 ? &height : NULL);
|
|
|
|
composite =
|
|
GDK_DRAWABLE_GET_CLASS (drawable)->get_composite_drawable (drawable,
|
|
x, y,
|
|
width, height,
|
|
&composite_x_offset,
|
|
&composite_y_offset);
|
|
|
|
retval = GDK_DRAWABLE_GET_CLASS (composite)->get_image (composite,
|
|
x - composite_x_offset,
|
|
y - composite_y_offset,
|
|
width, height);
|
|
|
|
g_object_unref (G_OBJECT (composite));
|
|
|
|
cmap = gdk_drawable_get_colormap (drawable);
|
|
|
|
if (retval && cmap)
|
|
gdk_image_set_colormap (retval, cmap);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static GdkDrawable*
|
|
gdk_drawable_real_get_composite_drawable (GdkDrawable *drawable,
|
|
gint x,
|
|
gint y,
|
|
gint width,
|
|
gint height,
|
|
gint *composite_x_offset,
|
|
gint *composite_y_offset)
|
|
{
|
|
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
|
|
|
|
*composite_x_offset = 0;
|
|
*composite_y_offset = 0;
|
|
|
|
return GDK_DRAWABLE (g_object_ref (G_OBJECT (drawable)));
|
|
}
|
|
|
|
/**
|
|
* gdk_drawable_get_clip_region:
|
|
* @drawable: a #GdkDrawable
|
|
*
|
|
* Computes the region of a drawable that potentially can be written
|
|
* to by drawing primitives. This region will not take into account
|
|
* the clip region for the GC, and may also not take into account
|
|
* other factors such as if the window is obscured by other windows,
|
|
* but no area outside of this region will be affected by drawing
|
|
* primitives.
|
|
*
|
|
* Return value: a #GdkRegion. This must be freed with gdk_region_destroy()
|
|
* when you are done.
|
|
**/
|
|
GdkRegion *
|
|
gdk_drawable_get_clip_region (GdkDrawable *drawable)
|
|
{
|
|
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
|
|
|
|
return GDK_DRAWABLE_GET_CLASS (drawable)->get_clip_region (drawable);
|
|
}
|
|
|
|
/**
|
|
* gdk_drawable_get_visible_region:
|
|
* @drawable:
|
|
*
|
|
* Computes the region of a drawable that is potentially visible.
|
|
* This does not necessarily take into account if the window is
|
|
* obscured by other windows, but no area outside of this region
|
|
* is visible.
|
|
*
|
|
* Return value: a #GdkRegion. This must be freed with gdk_region_destroy()
|
|
* when you are done.
|
|
**/
|
|
GdkRegion *
|
|
gdk_drawable_get_visible_region (GdkDrawable *drawable)
|
|
{
|
|
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
|
|
|
|
return GDK_DRAWABLE_GET_CLASS (drawable)->get_visible_region (drawable);
|
|
}
|
|
|
|
static GdkRegion *
|
|
gdk_drawable_real_get_visible_region (GdkDrawable *drawable)
|
|
{
|
|
GdkRectangle rect;
|
|
|
|
rect.x = 0;
|
|
rect.y = 0;
|
|
|
|
gdk_drawable_get_size (drawable, &rect.width, &rect.height);
|
|
|
|
return gdk_region_rectangle (&rect);
|
|
}
|