gdkdrawable-x11.c

linux下电话本所依赖的一些图形库

/* GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <config.h>

#include "gdkx.h"
#include "gdkregion-generic.h"

#include <pango/pangoxft.h>

#include <stdlib.h>
#include <string.h>		/* for memcpy() */

#if defined (HAVE_IPC_H) && defined (HAVE_SHM_H) && defined (HAVE_XSHM_H)
#define USE_SHM
#endif

#ifdef USE_SHM
#include <X11/extensions/XShm.h>
#endif /* USE_SHM */

#include "gdkprivate-x11.h"
#include "gdkdrawable-x11.h"
#include "gdkpixmap-x11.h"
#include "gdkscreen-x11.h"
#include "gdkdisplay-x11.h"

#include "gdkalias.h"

static void gdk_x11_draw_rectangle (GdkDrawable    *drawable,
				    GdkGC          *gc,
				    gboolean        filled,
				    gint            x,
				    gint            y,
				    gint            width,
				    gint            height);
static void gdk_x11_draw_arc       (GdkDrawable    *drawable,
				    GdkGC          *gc,
				    gboolean        filled,
				    gint            x,
				    gint            y,
				    gint            width,
				    gint            height,
				    gint            angle1,
				    gint            angle2);
static void gdk_x11_draw_polygon   (GdkDrawable    *drawable,
				    GdkGC          *gc,
				    gboolean        filled,
				    GdkPoint       *points,
				    gint            npoints);
static void gdk_x11_draw_text      (GdkDrawable    *drawable,
				    GdkFont        *font,
				    GdkGC          *gc,
				    gint            x,
				    gint            y,
				    const gchar    *text,
				    gint            text_length);
static void gdk_x11_draw_text_wc   (GdkDrawable    *drawable,
				    GdkFont        *font,
				    GdkGC          *gc,
				    gint            x,
				    gint            y,
				    const GdkWChar *text,
				    gint            text_length);
static void gdk_x11_draw_drawable  (GdkDrawable    *drawable,
				    GdkGC          *gc,
				    GdkPixmap      *src,
				    gint            xsrc,
				    gint            ysrc,
				    gint            xdest,
				    gint            ydest,
				    gint            width,
				    gint            height);
static void gdk_x11_draw_points    (GdkDrawable    *drawable,
				    GdkGC          *gc,
				    GdkPoint       *points,
				    gint            npoints);
static void gdk_x11_draw_segments  (GdkDrawable    *drawable,
				    GdkGC          *gc,
				    GdkSegment     *segs,
				    gint            nsegs);
static void gdk_x11_draw_lines     (GdkDrawable    *drawable,
				    GdkGC          *gc,
				    GdkPoint       *points,
				    gint            npoints);

static void gdk_x11_draw_glyphs             (GdkDrawable      *drawable,
					     GdkGC            *gc,
					     PangoFont        *font,
					     gint              x,
					     gint              y,
					     PangoGlyphString *glyphs);
static void gdk_x11_draw_glyphs_transformed (GdkDrawable      *drawable,
					     GdkGC            *gc,
					     PangoMatrix      *matrix,
					     PangoFont        *font,
					     gint              x,
					     gint              y,
					     PangoGlyphString *glyphs);

static void gdk_x11_draw_image     (GdkDrawable     *drawable,
                                    GdkGC           *gc,
                                    GdkImage        *image,
                                    gint             xsrc,
                                    gint             ysrc,
                                    gint             xdest,
                                    gint             ydest,
                                    gint             width,
                                    gint             height);
static void gdk_x11_draw_pixbuf    (GdkDrawable     *drawable,
				    GdkGC           *gc,
				    GdkPixbuf       *pixbuf,
				    gint             src_x,
				    gint             src_y,
				    gint             dest_x,
				    gint             dest_y,
				    gint             width,
				    gint             height,
				    GdkRgbDither     dither,
				    gint             x_dither,
				    gint             y_dither);

static void gdk_x11_draw_trapezoids (GdkDrawable     *drawable,
				     GdkGC	     *gc,
				     GdkTrapezoid    *trapezoids,
				     gint             n_trapezoids);

static void gdk_x11_set_colormap   (GdkDrawable    *drawable,
                                    GdkColormap    *colormap);

static GdkColormap* gdk_x11_get_colormap   (GdkDrawable    *drawable);
static gint         gdk_x11_get_depth      (GdkDrawable    *drawable);
static GdkScreen *  gdk_x11_get_screen	   (GdkDrawable    *drawable);
static GdkVisual*   gdk_x11_get_visual     (GdkDrawable    *drawable);

static void gdk_drawable_impl_x11_class_init (GdkDrawableImplX11Class *klass);

static void gdk_drawable_impl_x11_finalize   (GObject *object);

static gpointer parent_class = NULL;

GType
_gdk_drawable_impl_x11_get_type (void)
{
  static GType object_type = 0;

  if (!object_type)
    {
      static const GTypeInfo object_info =
      {
        sizeof (GdkDrawableImplX11Class),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gdk_drawable_impl_x11_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GdkDrawableImplX11),
        0,              /* n_preallocs */
        (GInstanceInitFunc) NULL,
      };
      
      object_type = g_type_register_static (GDK_TYPE_DRAWABLE,
                                            "GdkDrawableImplX11",
                                            &object_info, 0);
    }
  
  return object_type;
}

static void
gdk_drawable_impl_x11_class_init (GdkDrawableImplX11Class *klass)
{
  GdkDrawableClass *drawable_class = GDK_DRAWABLE_CLASS (klass);
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  
  parent_class = g_type_class_peek_parent (klass);

  object_class->finalize = gdk_drawable_impl_x11_finalize;
  
  drawable_class->create_gc = _gdk_x11_gc_new;
  drawable_class->draw_rectangle = gdk_x11_draw_rectangle;
  drawable_class->draw_arc = gdk_x11_draw_arc;
  drawable_class->draw_polygon = gdk_x11_draw_polygon;
  drawable_class->draw_text = gdk_x11_draw_text;
  drawable_class->draw_text_wc = gdk_x11_draw_text_wc;
  drawable_class->draw_drawable = gdk_x11_draw_drawable;
  drawable_class->draw_points = gdk_x11_draw_points;
  drawable_class->draw_segments = gdk_x11_draw_segments;
  drawable_class->draw_lines = gdk_x11_draw_lines;
  drawable_class->draw_glyphs = gdk_x11_draw_glyphs;
  drawable_class->draw_glyphs_transformed = gdk_x11_draw_glyphs_transformed;
  drawable_class->draw_image = gdk_x11_draw_image;
  drawable_class->draw_pixbuf = gdk_x11_draw_pixbuf;
  drawable_class->draw_trapezoids = gdk_x11_draw_trapezoids;
  
  drawable_class->set_colormap = gdk_x11_set_colormap;
  drawable_class->get_colormap = gdk_x11_get_colormap;

  drawable_class->get_depth = gdk_x11_get_depth;
  drawable_class->get_screen = gdk_x11_get_screen;
  drawable_class->get_visual = gdk_x11_get_visual;
  
  drawable_class->_copy_to_image = _gdk_x11_copy_to_image;
}

static void
gdk_drawable_impl_x11_finalize (GObject *object)
{
  gdk_drawable_set_colormap (GDK_DRAWABLE (object), NULL);

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
try_pixmap (Display *xdisplay,
	    int      screen,
	    int      depth)
{
  Pixmap pixmap = XCreatePixmap (xdisplay,
				 RootWindow (xdisplay, screen),
				 1, 1, depth);
  XFreePixmap (xdisplay, pixmap);
}

gboolean
_gdk_x11_have_render (GdkDisplay *display)
{
  Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);
  GdkDisplayX11 *x11display = GDK_DISPLAY_X11 (display);

  if (x11display->have_render == GDK_UNKNOWN)
    {
      int event_base, error_base;
      x11display->have_render =
	XRenderQueryExtension (xdisplay, &event_base, &error_base)
	? GDK_YES : GDK_NO;

      if (x11display->have_render == GDK_YES)
	{
	  /*
	   * Sun advertises RENDER, but fails to support 32-bit pixmaps.
	   * That is just no good.  Therefore, we check all screens
	   * for proper support.
	   */

	  int screen;
	  for (screen = 0; screen < ScreenCount (xdisplay); screen++)
	    {
	      int count;
	      int *depths = XListDepths (xdisplay, screen, &count);
	      gboolean has_8 = FALSE, has_32 = FALSE;

	      if (depths)
		{
		  int i;

		  for (i = 0; i < count; i++)
		    {
		      if (depths[i] == 8)
			has_8 = TRUE;
		      else if (depths[i] == 32)
			has_32 = TRUE;
		    }
		  XFree (depths);
		}

	      /* At this point, we might have a false positive;
	       * buggy versions of Xinerama only report depths for
	       * which there is an associated visual; so we actually
	       * go ahead and try create pixmaps.
	       */
	      if (!(has_8 && has_32))
		{
		  gdk_error_trap_push ();
		  if (!has_8)
		    try_pixmap (xdisplay, screen, 8);
		  if (!has_32)
		    try_pixmap (xdisplay, screen, 32);
		  XSync (xdisplay, False);
		  if (gdk_error_trap_pop () == 0)
		    {
		      has_8 = TRUE;
		      has_32 = TRUE;
		    }
		}
	      
	      if (!(has_8 && has_32))
		{
		  g_warning ("The X server advertises that RENDER support is present,\n"
			     "but fails to supply the necessary pixmap support.  In\n"
			     "other words, it is buggy.");
		  x11display->have_render = GDK_NO;
		  break;
		}
	    }
	}
    }

  return x11display->have_render == GDK_YES;
}

gboolean
_gdk_x11_have_render_with_trapezoids (GdkDisplay *display)
{
  Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);
  GdkDisplayX11 *x11display = GDK_DISPLAY_X11 (display);

  if (x11display->have_render_with_trapezoids == GDK_UNKNOWN)
    {
      x11display->have_render_with_trapezoids = GDK_NO;
      if (_gdk_x11_have_render (display))
	{
	  /*
	   * Require protocol >= 0.4 for CompositeTrapezoids support.
	   */
	  int major_version, minor_version;
	
#define XRENDER_TETRAPEZOIDS_MAJOR 0
#define XRENDER_TETRAPEZOIDS_MINOR 4
	
	  if (XRenderQueryVersion (xdisplay, &major_version,
				   &minor_version))
	    if ((major_version == XRENDER_TETRAPEZOIDS_MAJOR) &&
		(minor_version >= XRENDER_TETRAPEZOIDS_MINOR))
	      x11display->have_render_with_trapezoids = GDK_YES;
	}
    }

  return x11display->have_render_with_trapezoids == GDK_YES;
}

static XftDraw *
gdk_x11_drawable_get_xft_draw (GdkDrawable *drawable)
{
  GdkDrawableImplX11 *impl = GDK_DRAWABLE_IMPL_X11 (drawable);

   if (impl->xft_draw == NULL)
    {
      GdkColormap *colormap = gdk_drawable_get_colormap (drawable);
      
      if (colormap)
	{
          GdkVisual *visual;

          visual = gdk_colormap_get_visual (colormap);
      
          impl->xft_draw = XftDrawCreate (GDK_SCREEN_XDISPLAY (impl->screen), impl->xid,
 				          GDK_VISUAL_XVISUAL (visual), GDK_COLORMAP_XCOLORMAP (colormap));
	}
      else if (gdk_drawable_get_depth (drawable) == 1)
	{
	  impl->xft_draw = XftDrawCreateBitmap (GDK_SCREEN_XDISPLAY (impl->screen), impl->xid);
	}
      else
        {
	  g_warning ("Using Xft rendering requires the drawable argument to\n"
		     "have a specified colormap. All windows have a colormap,\n"
		     "however, pixmaps only have colormap by default if they\n"
		     "were created with a non-NULL window argument. Otherwise\n"
		     "a colormap must be set on them with gdk_drawable_set_colormap");
	  return NULL;
        }
    }

   return impl->xft_draw;
}

static Picture
gdk_x11_drawable_get_picture (GdkDrawable *drawable)
{
  XftDraw *draw = gdk_x11_drawable_get_xft_draw (drawable);

  return draw ? XftDrawPicture (draw) : None;
}

static void
gdk_x11_drawable_update_xft_clip (GdkDrawable *drawable,
				   GdkGC       *gc)
{
  GdkGCX11 *gc_private = gc ? GDK_GC_X11 (gc) : NULL;
  XftDraw *xft_draw = gdk_x11_drawable_get_xft_draw (drawable);

  if (gc && gc_private->clip_region)
    {
      GdkRegionBox *boxes = gc_private->clip_region->rects;
      gint n_boxes = gc_private->clip_region->numRects;
#if 0				/* Until XftDrawSetClipRectangles is there */
      XRectangle *rects = g_new (XRectangle, n_boxes);
      int i;

      for (i=0; i < n_boxes; i++)
	{
	  rects[i].x = CLAMP (boxes[i].x1 + gc->clip_x_origin, G_MINSHORT, G_MAXSHORT);
	  rects[i].y = CLAMP (boxes[i].y1 + gc->clip_y_origin, G_MINSHORT, G_MAXSHORT);
	  rects[i].width = CLAMP (boxes[i].x2 + gc->clip_x_origin, G_MINSHORT, G_MAXSHORT) - rects[i].x;
	  rects[i].height = CLAMP (boxes[i].y2 + gc->clip_y_origin, G_MINSHORT, G_MAXSHORT) - rects[i].y;
	}
      XftDrawSetClipRectangles (xft_draw, 0, 0, rects, n_boxes);

      g_free (rects);
#else
      Region xregion = XCreateRegion ();
      int i;
 
      for (i=0; i < n_boxes; i++)