gdkimage-x11.c

linux下电话本所依赖的一些图形库

/* GDK - The 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 <stdlib.h>
#include <sys/types.h>

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

#ifdef USE_SHM
#include <sys/ipc.h>
#include <sys/shm.h>
#endif /* USE_SHM */

#include <X11/Xlib.h>
#include <X11/Xutil.h>

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

#include <errno.h>

#include "gdk.h"		/* For gdk_error_trap_* / gdk_flush_* */
#include "gdkx.h"
#include "gdkimage.h"
#include "gdkprivate.h"
#include "gdkprivate-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkscreen-x11.h"
#include "gdkalias.h"

typedef struct _GdkImagePrivateX11     GdkImagePrivateX11;

struct _GdkImagePrivateX11
{
  XImage *ximage;
  GdkScreen *screen;
  gpointer x_shm_info;
  Pixmap shm_pixmap;
};

static GList *image_list = NULL;
static gpointer parent_class = NULL;

static void gdk_x11_image_destroy (GdkImage      *image);
static void gdk_image_init        (GdkImage      *image);
static void gdk_image_class_init  (GdkImageClass *klass);
static void gdk_image_finalize    (GObject       *object);

#define PRIVATE_DATA(image) ((GdkImagePrivateX11 *) GDK_IMAGE (image)->windowing_data)

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

  if (!object_type)
    {
      static const GTypeInfo object_info =
      {
        sizeof (GdkImageClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gdk_image_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GdkImage),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gdk_image_init,
      };
      
      object_type = g_type_register_static (G_TYPE_OBJECT,
                                            "GdkImage",
                                            &object_info, 0);
    }
  
  return object_type;
}

static void
gdk_image_init (GdkImage *image)
{
  image->windowing_data = g_new0 (GdkImagePrivateX11, 1);
}

static void
gdk_image_class_init (GdkImageClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  object_class->finalize = gdk_image_finalize;
}

static void
gdk_image_finalize (GObject *object)
{
  GdkImage *image = GDK_IMAGE (object);

  gdk_x11_image_destroy (image);
  
  G_OBJECT_CLASS (parent_class)->finalize (object);
}


void
_gdk_image_exit (void)
{
  GdkImage *image;

  while (image_list)
    {
      image = image_list->data;
      gdk_x11_image_destroy (image);
    }
}

/**
 * gdk_image_new_bitmap:
 * @visual: the #GdkVisual to use for the image.
 * @data: the pixel data. 
 * @width: the width of the image in pixels. 
 * @height: the height of the image in pixels. 
 * 
 * Creates a new #GdkImage with a depth of 1 from the given data.
 * <warning><para>THIS FUNCTION IS INCREDIBLY BROKEN. The passed-in data must 
 * be allocated by malloc() (NOT g_malloc()) and will be freed when the 
 * image is freed.</para></warning>
 * 
 * Return value: a new #GdkImage.
 **/
GdkImage *
gdk_image_new_bitmap(GdkVisual *visual, gpointer data, gint width, gint height)
{
  Visual *xvisual;
  GdkImage *image;
  GdkDisplay *display;
  GdkImagePrivateX11 *private;
  
  image = g_object_new (gdk_image_get_type (), NULL);
  private = PRIVATE_DATA (image);
  private->screen = gdk_visual_get_screen (visual);
  display = GDK_SCREEN_DISPLAY (private->screen);
  
  image->type = GDK_IMAGE_NORMAL;
  image->visual = visual;
  image->width = width;
  image->height = height;
  image->depth = 1;
  image->bits_per_pixel = 1;
  if (display->closed)
    private->ximage = NULL;
  else
    {
      xvisual = ((GdkVisualPrivate*) visual)->xvisual;
      private->ximage = XCreateImage (GDK_SCREEN_XDISPLAY (private->screen),
				      xvisual, 1, XYBitmap,
				      0, NULL, width, height, 8, 0);
    }
  
  private->ximage->data = data;
  private->ximage->bitmap_bit_order = MSBFirst;
  private->ximage->byte_order = MSBFirst;
  image->byte_order = MSBFirst;
  image->mem =  private->ximage->data;
  image->bpl = private->ximage->bytes_per_line;
  image->bpp = 1;
  return(image);
} /* gdk_image_new_bitmap() */

void
_gdk_windowing_image_init (GdkDisplay *display)
{
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
  
  if (display_x11->use_xshm)
    {
#ifdef USE_SHM
      Display *xdisplay = display_x11->xdisplay;
      int major, minor, event_base;
      Bool pixmaps;
  
      if (XShmQueryExtension (xdisplay) &&
	  XShmQueryVersion (xdisplay, &major, &minor, &pixmaps))
	{
	  display_x11->have_shm_pixmaps = pixmaps;
	  event_base = XShmGetEventBase (xdisplay);

	  gdk_x11_register_standard_event_type (display,
						event_base, ShmNumberEvents);
	}
      else
#endif /* USE_SHM */
	display_x11->use_xshm = FALSE;
    }
}

GdkImage*
_gdk_image_new_for_depth (GdkScreen    *screen,
			  GdkImageType  type,
			  GdkVisual    *visual,
			  gint          width,
			  gint          height,
			  gint          depth)
{
  GdkImage *image;
  GdkImagePrivateX11 *private;
#ifdef USE_SHM
  XShmSegmentInfo *x_shm_info;
#endif /* USE_SHM */
  Visual *xvisual = NULL;
  GdkDisplayX11 *display_x11;
  GdkScreenX11 *screen_x11;

  g_return_val_if_fail (!visual || GDK_IS_VISUAL (visual), NULL);
  g_return_val_if_fail (visual || depth != -1, NULL);
  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
  
  screen_x11 = GDK_SCREEN_X11 (screen);
  display_x11 = GDK_DISPLAY_X11 (screen_x11->display);
  
  if (visual)
    depth = visual->depth;
  
  switch (type)
    {
    case GDK_IMAGE_FASTEST:
      image = _gdk_image_new_for_depth (screen, GDK_IMAGE_SHARED, 
					visual, width, height, depth);
      if (!image)
	image = _gdk_image_new_for_depth (screen, GDK_IMAGE_NORMAL,
					  visual, width, height, depth);
      break;

    default:
      image = g_object_new (gdk_image_get_type (), NULL);
      
      private = PRIVATE_DATA (image);

      private->screen = screen;

      image->type = type;
      image->visual = visual;
      image->width = width;
      image->height = height;
      image->depth = depth;

      if (visual)
	xvisual = ((GdkVisualPrivate*) visual)->xvisual;

      switch (type)
	{
	case GDK_IMAGE_SHARED:
#ifdef USE_SHM
	  if (display_x11->use_xshm)
	    {
	      private->x_shm_info = g_new (XShmSegmentInfo, 1);
	      x_shm_info = private->x_shm_info;
	      x_shm_info->shmid = -1;
	      x_shm_info->shmaddr = (char*) -1;

	      private->ximage = XShmCreateImage (screen_x11->xdisplay, xvisual, depth,
						 ZPixmap, NULL, x_shm_info, width, height);
	      if (private->ximage == NULL)
		{
		  g_warning ("XShmCreateImage failed");
		  display_x11->use_xshm = FALSE;
		  
		  goto error;
		}

	      x_shm_info->shmid = shmget (IPC_PRIVATE,
					  private->ximage->bytes_per_line * private->ximage->height,
					  IPC_CREAT | 0600);

	      if (x_shm_info->shmid == -1)
		{
		  /* EINVAL indicates, most likely, that the segment we asked for
		   * is bigger than SHMMAX, so we don't treat it as a permanent
		   * error. ENOSPC and ENOMEM may also indicate this, but
		   * more likely are permanent errors.
		   */
		  if (errno != EINVAL)
		    {
		      g_warning ("shmget failed: error %d (%s)", errno, g_strerror (errno));
		      display_x11->use_xshm = FALSE;
		    }

		  goto error;
		}

	      x_shm_info->readOnly = False;
	      x_shm_info->shmaddr = shmat (x_shm_info->shmid, NULL, 0);
	      private->ximage->data = x_shm_info->shmaddr;

	      if (x_shm_info->shmaddr == (char*) -1)
		{
		  g_warning ("shmat failed: error %d (%s)", errno, g_strerror (errno));
		  /* Failure in shmat is almost certainly permanent. Most likely error is
		   * EMFILE, which would mean that we've exceeded the per-process
		   * Shm segment limit.
		   */
		  display_x11->use_xshm = FALSE;
		  goto error;
		}

	      gdk_error_trap_push ();

	      XShmAttach (screen_x11->xdisplay, x_shm_info);
	      XSync (screen_x11->xdisplay, False);

	      if (gdk_error_trap_pop ())
		{
		  /* this is the common failure case so omit warning */
		  display_x11->use_xshm = FALSE;
		  goto error;
		}
	      
	      /* We mark the segment as destroyed so that when
	       * the last process detaches, it will be deleted.
	       * There is a small possibility of leaking if
	       * we die in XShmAttach. In theory, a signal handler
	       * could be set up.
	       */
	      shmctl (x_shm_info->shmid, IPC_RMID, NULL);		      

	      if (image)
		image_list = g_list_prepend (image_list, image);
	    }
	  else
#endif /* USE_SHM */
	    goto error;
	  break;
	case GDK_IMAGE_NORMAL:
	  private->ximage = XCreateImage (screen_x11->xdisplay, xvisual, depth,
					  ZPixmap, 0, NULL, width, height, 32, 0);

	  /* Use malloc, not g_malloc here, because X will call free()
	   * on this data
	   */
	  private->ximage->data = malloc (private->ximage->bytes_per_line *
					  private->ximage->height);
	  if (!private->ximage->data)
	    goto error;
	  break;

	case GDK_IMAGE_FASTEST:
	  g_assert_not_reached ();
	}

      if (image)
	{
	  image->byte_order = (private->ximage->byte_order == LSBFirst) ? GDK_LSB_FIRST : GDK_MSB_FIRST;
	  image->mem = private->ximage->data;
	  image->bpl = private->ximage->bytes_per_line;
	  image->bpp = (private->ximage->bits_per_pixel + 7) / 8;
	  image->bits_per_pixel = private->ximage->bits_per_pixel;
	}
    }

  return image;

 error:
  if (private->ximage)
    {
      XDestroyImage (private->ximage);
      private->ximage = NULL;
    }
#ifdef USE_SHM
  if (private->x_shm_info)
    {
      x_shm_info = private->x_shm_info;
      
      if (x_shm_info->shmaddr != (char *)-1)
	shmdt (x_shm_info->shmaddr);
      if (x_shm_info->shmid != -1) 
	shmctl (x_shm_info->shmid, IPC_RMID, NULL);
      
      g_free (x_shm_info);
      private->x_shm_info = NULL;
    }
#endif /* USE_SHM */
  g_object_unref (image);
  
  return NULL;
}

Pixmap
_gdk_x11_image_get_shm_pixmap (GdkImage *image)
{
  GdkImagePrivateX11 *private = PRIVATE_DATA (image);
  GdkDisplay *display = GDK_SCREEN_DISPLAY (private->screen);

  if (display->closed)
    return None;