gdkimage-x11.c

linux下电话本所依赖的一些图形库

#ifdef USE_SHM  
  /* Future: do we need one of these per-screen per-image? ShmPixmaps
   * are the same for every screen, but can they be shared? Not a concern
   * right now since we tie images to a particular screen.
   */
  if (!private->shm_pixmap && image->type == GDK_IMAGE_SHARED && 
      GDK_DISPLAY_X11 (display)->have_shm_pixmaps)
    private->shm_pixmap = XShmCreatePixmap (GDK_SCREEN_XDISPLAY (private->screen),
					    GDK_SCREEN_XROOTWIN (private->screen),
					    image->mem, private->x_shm_info, 
					    image->width, image->height, image->depth);

  return private->shm_pixmap;
#else
  return None;
#endif    
}

static GdkImage*
get_full_image (GdkDrawable    *drawable,
		gint            src_x,
		gint            src_y,
		gint            width,
		gint            height)
{
  GdkImage *image;
  GdkImagePrivateX11 *private;
  GdkDrawableImplX11 *impl;
  XImage *ximage;

  impl = GDK_DRAWABLE_IMPL_X11 (drawable);
  
  ximage = XGetImage (GDK_SCREEN_XDISPLAY (impl->screen),
		      impl->xid,
		      src_x, src_y, width, height,
		      AllPlanes, ZPixmap);
  
  if (!ximage)
    return NULL;
  
  image = g_object_new (gdk_image_get_type (), NULL);
  
  private = PRIVATE_DATA (image);
  
  private->screen = impl->screen;
  private->ximage = ximage;
  
  image->type = GDK_IMAGE_NORMAL;
  image->visual = gdk_drawable_get_visual (drawable); /* could be NULL */
  image->width = width;
  image->height = height;
  image->depth = gdk_drawable_get_depth (drawable);
  
  image->mem = private->ximage->data;
  image->bpl = private->ximage->bytes_per_line;
  image->bits_per_pixel = private->ximage->bits_per_pixel;
  image->bpp = (private->ximage->bits_per_pixel + 7) / 8;
  image->byte_order = (private->ximage->byte_order == LSBFirst) ? GDK_LSB_FIRST : GDK_MSB_FIRST;
  
  return image;
}

GdkImage*
_gdk_x11_copy_to_image (GdkDrawable    *drawable,
			GdkImage       *image,
			gint            src_x,
			gint            src_y,
			gint            dest_x,
			gint            dest_y,
			gint            width,
			gint            height)
{
  GdkImagePrivateX11 *private;
  GdkDrawableImplX11 *impl;
  GdkVisual *visual;
  GdkDisplay *display;
  Display *xdisplay;
  gboolean have_grab;
  GdkRectangle req;
  GdkRectangle window_rect;
  Pixmap shm_pixmap = None;
  gboolean success = TRUE;
  
  g_return_val_if_fail (GDK_IS_DRAWABLE_IMPL_X11 (drawable), NULL);
  g_return_val_if_fail (image != NULL || (dest_x == 0 && dest_y == 0), NULL);

  visual = gdk_drawable_get_visual (drawable);
  impl = GDK_DRAWABLE_IMPL_X11 (drawable);
  display = gdk_drawable_get_display (drawable);
  xdisplay = gdk_x11_display_get_xdisplay (display);

  if (display->closed)
    return NULL;
  
  have_grab = FALSE;

#define UNGRAB() G_STMT_START {					\
    if (have_grab) {						\
      gdk_x11_display_ungrab (display);				\
      have_grab = FALSE; }					\
  } G_STMT_END

  if (!image && !GDK_IS_WINDOW_IMPL_X11 (drawable))
    return get_full_image (drawable, src_x, src_y, width, height);

  if (image && image->type == GDK_IMAGE_SHARED)
    {
      shm_pixmap = _gdk_x11_image_get_shm_pixmap (image);
      if (shm_pixmap)
	{
	  GC xgc;
	  XGCValues values;

	  /* Again easy, we can just XCopyArea, and don't have to worry about clipping
	   */
	  values.subwindow_mode = IncludeInferiors;
	  xgc = XCreateGC (xdisplay, impl->xid, GCSubwindowMode, &values);
	  
	  XCopyArea (xdisplay, impl->xid, shm_pixmap, xgc,
		     src_x, src_y, width, height, dest_x, dest_y);
	  XSync (xdisplay, FALSE);
	  
	  XFreeGC (xdisplay, xgc);
	  
	  return image;
	}
    }

  /* Now the general case - we may have to worry about clipping to the screen
   * bounds, in which case we'll have to grab the server and only get a piece
   * of the window.
   */
  if (GDK_IS_WINDOW_IMPL_X11 (drawable))
    {
      GdkRectangle screen_rect;
      Window child;

      have_grab = TRUE;
      gdk_x11_display_grab (display);

      /* Translate screen area into window coordinates */
      XTranslateCoordinates (xdisplay,
			     GDK_SCREEN_XROOTWIN (impl->screen),
			     impl->xid,
			     0, 0, 
			     &screen_rect.x, &screen_rect.y, 
			     &child);

      screen_rect.width = gdk_screen_get_width (impl->screen);
      screen_rect.height = gdk_screen_get_height (impl->screen);
      
      gdk_error_trap_push ();

      window_rect.x = 0;
      window_rect.y = 0;
      
      gdk_window_get_geometry (GDK_WINDOW (impl->wrapper),
                               NULL, NULL,
                               &window_rect.width,
                               &window_rect.height,
                               NULL);
      
      /* compute intersection of screen and window, in window
       * coordinates
       */
      if (gdk_error_trap_pop () ||
          !gdk_rectangle_intersect (&window_rect, &screen_rect, 
                                    &window_rect))
	goto out;
    }
  else
    {
      window_rect.x = 0;
      window_rect.y = 0;
      gdk_drawable_get_size (drawable,
			     &window_rect.width,
			     &window_rect.height);
    }
      
  req.x = src_x;
  req.y = src_y;
  req.width = width;
  req.height = height;
  
  /* window_rect specifies the part of drawable which we can get from
   * the server in window coordinates. 
   * For pixmaps this is all of the pixmap, for windows it is just 
   * the onscreen part.
   */
  if (!gdk_rectangle_intersect (&req, &window_rect, &req))
    goto out;

  gdk_error_trap_push ();
  
  if (!image &&
      req.x == src_x && req.y == src_y && req.width == width && req.height == height)
    {
      image = get_full_image (drawable, src_x, src_y, width, height);
      if (!image)
	success = FALSE;
    }
  else
    {
      gboolean created_image = FALSE;
      
      if (!image)
	{
	  image = _gdk_image_new_for_depth (impl->screen, GDK_IMAGE_NORMAL, 
					    visual, width, height,
					    gdk_drawable_get_depth (drawable));
	  created_image = TRUE;
	}

      private = PRIVATE_DATA (image);

      /* In the ShmImage but no ShmPixmap case, we could use XShmGetImage when
       * we are getting the entire image.
       */
      if (XGetSubImage (xdisplay, impl->xid,
			req.x, req.y, req.width, req.height,
			AllPlanes, ZPixmap,
			private->ximage,
			dest_x + req.x - src_x, dest_y + req.y - src_y) == None)
	{
	  if (created_image)
	    g_object_unref (image);
	  image = NULL;
	  success = FALSE;
	}
    }

  gdk_error_trap_pop ();

 out:
  
  if (have_grab)
    {				
      gdk_x11_display_ungrab (display);
      have_grab = FALSE;
    }
  
  if (success && !image)
    {
      /* We "succeeded", but could get no content for the image so return junk */
      image = _gdk_image_new_for_depth (impl->screen, GDK_IMAGE_NORMAL, 
					visual, width, height,
					gdk_drawable_get_depth (drawable));
    }
      
  return image;
}

guint32
gdk_image_get_pixel (GdkImage *image,
		     gint x,
		     gint y)
{
  guint32 pixel;
  GdkImagePrivateX11 *private;

  g_return_val_if_fail (GDK_IS_IMAGE (image), 0);
  g_return_val_if_fail (x >= 0 && x < image->width, 0);
  g_return_val_if_fail (y >= 0 && y < image->height, 0);

  private = PRIVATE_DATA (image);

  if (!private->screen->closed)
    pixel = XGetPixel (private->ximage, x, y);
  else
    pixel = 0;

  return pixel;
}

void
gdk_image_put_pixel (GdkImage *image,
		     gint x,
		     gint y,
		     guint32 pixel)
{
  GdkImagePrivateX11 *private;

  g_return_if_fail (GDK_IS_IMAGE (image));
  g_return_if_fail (x >= 0 && x < image->width);
  g_return_if_fail (y >= 0 && y < image->height);

  private = PRIVATE_DATA (image);

  if (!private->screen->closed)
    pixel = XPutPixel (private->ximage, x, y, pixel);
}

static void
gdk_x11_image_destroy (GdkImage *image)
{
  GdkImagePrivateX11 *private;
#ifdef USE_SHM
  XShmSegmentInfo *x_shm_info;
#endif /* USE_SHM */

  g_return_if_fail (GDK_IS_IMAGE (image));

  private = PRIVATE_DATA (image);

  if (private == NULL) /* This means that _gdk_image_exit() destroyed the
                        * image already, and now we're called a second
                        * time from _finalize()
                        */
    return;

  if (private->ximage)		/* Deal with failure of creation */
    {
      switch (image->type)
	{
	case GDK_IMAGE_NORMAL:
	  if (!private->screen->closed)
	    XDestroyImage (private->ximage);
	  break;
	  
	case GDK_IMAGE_SHARED:
#ifdef USE_SHM
	  if (!private->screen->closed)
	    {
	      gdk_display_sync (GDK_SCREEN_DISPLAY (private->screen));

	      if (private->shm_pixmap)
		XFreePixmap (GDK_SCREEN_XDISPLAY (private->screen), private->shm_pixmap);
	  	  
	      XShmDetach (GDK_SCREEN_XDISPLAY (private->screen), private->x_shm_info);
	      XDestroyImage (private->ximage);
	    }
	  
	  image_list = g_list_remove (image_list, image);

	  x_shm_info = private->x_shm_info;
	  shmdt (x_shm_info->shmaddr);
	  
	  g_free (private->x_shm_info);
	  private->x_shm_info = NULL;

#else /* USE_SHM */
	  g_error ("trying to destroy shared memory image when gdk was compiled without shared memory support");
#endif /* USE_SHM */
	  break;
	  
	case GDK_IMAGE_FASTEST:
	  g_assert_not_reached ();
	}
    }

  g_free (private);
  image->windowing_data = NULL;
}

/**
 * gdk_x11_image_get_xdisplay:
 * @image: a #GdkImage.
 * 
 * Returns the display of a #GdkImage.
 * 
 * Return value: an Xlib <type>Display*</type>.
 **/
Display *
gdk_x11_image_get_xdisplay (GdkImage *image)
{
  GdkImagePrivateX11 *private;

  g_return_val_if_fail (GDK_IS_IMAGE (image), NULL);

  private = PRIVATE_DATA (image);

  return GDK_SCREEN_XDISPLAY (private->screen);
}

/**
 * gdk_x11_image_get_ximage:
 * @image: a #GdkImage.
 * 
 * Returns the X image belonging to a #GdkImage.
 * 
 * Return value: an <type>XImage*</type>.
 **/
XImage *
gdk_x11_image_get_ximage (GdkImage *image)
{
  GdkImagePrivateX11 *private;

  g_return_val_if_fail (GDK_IS_IMAGE (image), NULL);

  private = PRIVATE_DATA (image);

  if (private->screen->closed)
    return NULL;
  else
    return private->ximage;
}

gint
_gdk_windowing_get_bits_for_depth (GdkDisplay *display,
				   gint        depth)
{
  XPixmapFormatValues *formats;
  gint count, i;

  formats = XListPixmapFormats (GDK_DISPLAY_XDISPLAY (display), &count);
  
  for (i = 0; i < count; i++)
    if (formats[i].depth == depth)
      {
	gint result = formats[i].bits_per_pixel;
	XFree (formats);
	return result;
      }

  g_assert_not_reached ();
  return -1;
}


#define __GDK_IMAGE_X11_C__
#include "gdkaliasdef.c"