gdkdrawable-x11.c

linux下电话本所依赖的一些图形库

  PangoRenderer *renderer;

  impl = GDK_DRAWABLE_IMPL_X11 (drawable);

  g_return_if_fail (PANGO_XFT_IS_FONT (font));

  renderer = _gdk_x11_renderer_get (drawable, gc);
  if (matrix)
    pango_renderer_set_matrix (renderer, matrix);
  pango_renderer_draw_glyphs (renderer, font, glyphs, x, y);
  if (matrix)
    pango_renderer_set_matrix (renderer, NULL);
}

static void
gdk_x11_draw_image     (GdkDrawable     *drawable,
                        GdkGC           *gc,
                        GdkImage        *image,
                        gint             xsrc,
                        gint             ysrc,
                        gint             xdest,
                        gint             ydest,
                        gint             width,
                        gint             height)
{
  GdkDrawableImplX11 *impl;

  impl = GDK_DRAWABLE_IMPL_X11 (drawable);

#ifdef USE_SHM  
  if (image->type == GDK_IMAGE_SHARED)
    XShmPutImage (GDK_SCREEN_XDISPLAY (impl->screen), impl->xid,
                  GDK_GC_GET_XGC (gc), GDK_IMAGE_XIMAGE (image),
                  xsrc, ysrc, xdest, ydest, width, height, False);
  else
#endif
    XPutImage (GDK_SCREEN_XDISPLAY (impl->screen), impl->xid,
               GDK_GC_GET_XGC (gc), GDK_IMAGE_XIMAGE (image),
               xsrc, ysrc, xdest, ydest, width, height);
}

static gint
gdk_x11_get_depth (GdkDrawable *drawable)
{
  /* This is a bit bogus but I'm not sure the other way is better */

  return gdk_drawable_get_depth (GDK_DRAWABLE_IMPL_X11 (drawable)->wrapper);
}

static GdkDrawable *
get_impl_drawable (GdkDrawable *drawable)
{
  if (GDK_IS_WINDOW (drawable))
    return ((GdkWindowObject *)drawable)->impl;
  else if (GDK_IS_PIXMAP (drawable))
    return ((GdkPixmapObject *)drawable)->impl;
  else
    {
      g_warning (G_STRLOC " drawable is not a pixmap or window");
      return NULL;
    }
}

static GdkScreen*
gdk_x11_get_screen (GdkDrawable *drawable)
{
  if (GDK_IS_DRAWABLE_IMPL_X11 (drawable))
    return GDK_DRAWABLE_IMPL_X11 (drawable)->screen;
  else
    return GDK_DRAWABLE_IMPL_X11 (get_impl_drawable (drawable))->screen;
}

static GdkVisual*
gdk_x11_get_visual (GdkDrawable    *drawable)
{
  return gdk_drawable_get_visual (GDK_DRAWABLE_IMPL_X11 (drawable)->wrapper);
}

/**
 * gdk_x11_drawable_get_xdisplay:
 * @drawable: a #GdkDrawable.
 * 
 * Returns the display of a #GdkDrawable.
 * 
 * Return value: an Xlib <type>Display*</type>.
 **/
Display *
gdk_x11_drawable_get_xdisplay (GdkDrawable *drawable)
{
  if (GDK_IS_DRAWABLE_IMPL_X11 (drawable))
    return GDK_SCREEN_XDISPLAY (GDK_DRAWABLE_IMPL_X11 (drawable)->screen);
  else
    return GDK_SCREEN_XDISPLAY (GDK_DRAWABLE_IMPL_X11 (get_impl_drawable (drawable))->screen);
}

/**
 * gdk_x11_drawable_get_xid:
 * @drawable: a #GdkDrawable.
 * 
 * Returns the X resource (window or pixmap) belonging to a #GdkDrawable.
 * 
 * Return value: the ID of @drawable's X resource.
 **/
XID
gdk_x11_drawable_get_xid (GdkDrawable *drawable)
{
  GdkDrawable *impl;
  
  if (GDK_IS_WINDOW (drawable))
    impl = ((GdkPixmapObject *)drawable)->impl;
  else if (GDK_IS_PIXMAP (drawable))
    impl = ((GdkPixmapObject *)drawable)->impl;
  else
    {
      g_warning (G_STRLOC " drawable is not a pixmap or window");
      return None;
    }

  return ((GdkDrawableImplX11 *)impl)->xid;
}

/* Code for accelerated alpha compositing using the RENDER extension.
 * It's a bit long because there are lots of possibilities for
 * what's the fastest depending on the available picture formats,
 * whether we can used shared pixmaps, etc.
 */

static GdkX11FormatType
select_format (GdkDisplay         *display,
	       XRenderPictFormat **format,
	       XRenderPictFormat **mask)
{
  Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);
  XRenderPictFormat pf;

  if (!_gdk_x11_have_render (display))
    return GDK_X11_FORMAT_NONE;
  
  /* Look for a 32-bit xRGB and Axxx formats that exactly match the
   * in memory data format. We can use them as pixmap and mask
   * to deal with non-premultiplied data.
   */

  pf.type = PictTypeDirect;
  pf.depth = 32;
  pf.direct.redMask = 0xff;
  pf.direct.greenMask = 0xff;
  pf.direct.blueMask = 0xff;
  
  pf.direct.alphaMask = 0;
  if (ImageByteOrder (xdisplay) == LSBFirst)
    {
      /* ABGR */
      pf.direct.red = 0;
      pf.direct.green = 8;
      pf.direct.blue = 16;
    }
  else
    {
      /* RGBA */
      pf.direct.red = 24;
      pf.direct.green = 16;
      pf.direct.blue = 8;
    }
  
  *format = XRenderFindFormat (xdisplay,
			       (PictFormatType | PictFormatDepth |
				PictFormatRedMask | PictFormatRed |
				PictFormatGreenMask | PictFormatGreen |
				PictFormatBlueMask | PictFormatBlue |
				PictFormatAlphaMask),
			       &pf,
			       0);

  pf.direct.alphaMask = 0xff;
  if (ImageByteOrder (xdisplay) == LSBFirst)
    {
      /* ABGR */
      pf.direct.alpha = 24;
    }
  else
    {
      pf.direct.alpha = 0;
    }
  
  *mask = XRenderFindFormat (xdisplay,
			     (PictFormatType | PictFormatDepth |
			      PictFormatAlphaMask | PictFormatAlpha),
			     &pf,
			     0);

  if (*format && *mask)
    return GDK_X11_FORMAT_EXACT_MASK;

  /* OK, that failed, now look for xRGB and Axxx formats in
   * RENDER's preferred order
   */
  pf.direct.alphaMask = 0;
  /* ARGB */
  pf.direct.red = 16;
  pf.direct.green = 8;
  pf.direct.blue = 0;
  
  *format = XRenderFindFormat (xdisplay,
			       (PictFormatType | PictFormatDepth |
				PictFormatRedMask | PictFormatRed |
				PictFormatGreenMask | PictFormatGreen |
				PictFormatBlueMask | PictFormatBlue |
				PictFormatAlphaMask),
			       &pf,
			       0);

  pf.direct.alphaMask = 0xff;
  pf.direct.alpha = 24;
  
  *mask = XRenderFindFormat (xdisplay,
			     (PictFormatType | PictFormatDepth |
			      PictFormatAlphaMask | PictFormatAlpha),
			     &pf,
			     0);

  if (*format && *mask)
    return GDK_X11_FORMAT_ARGB_MASK;

  /* Finally, if neither of the above worked, fall back to
   * looking for combined ARGB -- we'll premultiply ourselves.
   */

  pf.type = PictTypeDirect;
  pf.depth = 32;
  pf.direct.red = 16;
  pf.direct.green = 8;
  pf.direct.blue = 0;
  pf.direct.alphaMask = 0xff;
  pf.direct.alpha = 24;

  *format = XRenderFindFormat (xdisplay,
			       (PictFormatType | PictFormatDepth |
				PictFormatRedMask | PictFormatRed |
				PictFormatGreenMask | PictFormatGreen |
				PictFormatBlueMask | PictFormatBlue |
				PictFormatAlphaMask | PictFormatAlpha),
			       &pf,
			       0);
  *mask = NULL;

  if (*format)
    return GDK_X11_FORMAT_ARGB;

  return GDK_X11_FORMAT_NONE;
}

#if 0
static void
list_formats (XRenderPictFormat *pf)
{
  gint i;
  
  for (i=0 ;; i++)
    {
      XRenderPictFormat *pf = XRenderFindFormat (impl->xdisplay, 0, NULL, i);
      if (pf)
	{
	  g_print ("%2d R-%#06x/%#06x G-%#06x/%#06x B-%#06x/%#06x A-%#06x/%#06x\n",
		   pf->depth,
		   pf->direct.red,
		   pf->direct.redMask,
		   pf->direct.green,
		   pf->direct.greenMask,
		   pf->direct.blue,
		   pf->direct.blueMask,
		   pf->direct.alpha,
		   pf->direct.alphaMask);
	}
      else
	break;
    }
}
#endif  

void
_gdk_x11_convert_to_format (guchar           *src_buf,
                            gint              src_rowstride,
                            guchar           *dest_buf,
                            gint              dest_rowstride,
                            GdkX11FormatType  dest_format,
                            GdkByteOrder      dest_byteorder,
                            gint              width,
                            gint              height)
{
  gint i;

  for (i=0; i < height; i++)
    {
      switch (dest_format)
	{
	case GDK_X11_FORMAT_EXACT_MASK:
	  {
	    memcpy (dest_buf + i * dest_rowstride,
		    src_buf + i * src_rowstride,
		    width * 4);
	    break;
	  }
	case GDK_X11_FORMAT_ARGB_MASK:
	  {
	    guchar *row = src_buf + i * src_rowstride;
	    if (((gsize)row & 3) != 0)
	      {
		guchar *p = row;
		guint32 *q = (guint32 *)(dest_buf + i * dest_rowstride);
		guchar *end = p + 4 * width;

		while (p < end)
		  {
		    *q = (p[3] << 24) | (p[0] << 16) | (p[1] << 8) | p[2];
		    p += 4;
		    q++;
		  }
	      }
	    else
	      {
		guint32 *p = (guint32 *)row;
		guint32 *q = (guint32 *)(dest_buf + i * dest_rowstride);
		guint32 *end = p + width;

#if G_BYTE_ORDER == G_LITTLE_ENDIAN	    
		if (dest_byteorder == GDK_LSB_FIRST)
		  {
		    /* ABGR => ARGB */
		
		    while (p < end)
		      {
			*q = ( (*p & 0xff00ff00) |
			       ((*p & 0x000000ff) << 16) |
			       ((*p & 0x00ff0000) >> 16));
			q++;
			p++;
		      }
		  }
		else
		  {
		    /* ABGR => BGRA */
		
		    while (p < end)
		      {
			*q = (((*p & 0xff000000) >> 24) |
			      ((*p & 0x00ffffff) << 8));
			q++;
			p++;
		      }
		  }
#else /* G_BYTE_ORDER == G_BIG_ENDIAN */
		if (dest_byteorder == GDK_LSB_FIRST)
		  {
		    /* RGBA => BGRA */
		
		    while (p < end)
		      {
			*q = ( (*p & 0x00ff00ff) |
			       ((*p & 0x0000ff00) << 16) |
			       ((*p & 0xff000000) >> 16));
			q++;
			p++;
		      }
		  }
		else
		  {
		    /* RGBA => ARGB */
		
		    while (p < end)
		      {
			*q = (((*p & 0xffffff00) >> 8) |
			      ((*p & 0x000000ff) << 24));
			q++;
			p++;
		      }
		  }
#endif /* G_BYTE_ORDER*/	    
	      }
	    break;
	  }
	case GDK_X11_FORMAT_ARGB:
	  {
	    guchar *p = (src_buf + i * src_rowstride);
	    guchar *q = (dest_buf + i * dest_rowstride);
	    guchar *end = p + 4 * width;
	    guint t1,t2,t3;
	    
#define MULT(d,c,a,t) G_STMT_START { t = c * a; d = ((t >> 8) + t) >> 8; } G_STMT_END
	    
	    if (dest_byteorder == GDK_LSB_FIRST)
	      {
		while (p < end)
		  {
		    MULT(q[0], p[2], p[3], t1);
		    MULT(q[1], p[1], p[3], t2);
		    MULT(q[2], p[0], p[3], t3);
		    q[3] = p[3];
		    p += 4;
		    q += 4;
		  }
	      }
	    else
	      {
		while (p < end)
		  {
		    q[0] = p[3];
		    MULT(q[1], p[0], p[3], t1);
		    MULT(q[2], p[1], p[3], t2);
		    MULT(q[3], p[2], p[3], t3);
		    p += 4;
		    q += 4;
		  }
	      }
#undef MULT
	    break;
	  }
	case GDK_X11_FORMAT_NONE:
	  g_assert_not_reached ();
	  break;
	}
    }
}

static void
draw_with_images (GdkDrawable       *drawable,
		  GdkGC             *gc,
		  GdkX11FormatType   format_type,