]> Pileus Git - ~andy/gtk/blobdiff - gdk/x11/gdkdrawable-x11.c
on Feb 4 10:06:49 2002 Owen Taylor <otaylor@redhat.com>
[~andy/gtk] / gdk / x11 / gdkdrawable-x11.c
index 9ccf8b81176b58ce10906e84662f7ecdf217d9b7..89c7661ff41b3d088f02f554525b7afddf8adb1e 100644 (file)
@@ -1,4 +1,4 @@
-/* GDK - The GIMP Drawing Kit
+/* 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
  * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
  */
 
-#include "gdkprivate-x11.h"
+#include "gdkx.h"
+#include "gdkregion-generic.h"
+
 #include <pango/pangox.h>
 #include <config.h>
 
+#if HAVE_XFT
+#include <pango/pangoxft.h>
+#endif
+
 #include <stdlib.h>
+#include <string.h>            /* for memcpy() */
 
 #if defined (HAVE_IPC_H) && defined (HAVE_SHM_H) && defined (HAVE_XSHM_H)
 #define USE_SHM
@@ -113,6 +120,20 @@ static void gdk_x11_draw_image     (GdkDrawable     *drawable,
                                     gint             ydest,
                                     gint             width,
                                     gint             height);
+#ifdef HAVE_XFT
+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);
+#endif /* HAVE_XFT */
 
 static void gdk_x11_set_colormap   (GdkDrawable    *drawable,
                                     GdkColormap    *colormap);
@@ -121,12 +142,16 @@ static GdkColormap* gdk_x11_get_colormap   (GdkDrawable    *drawable);
 
 static gint         gdk_x11_get_depth      (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)
+_gdk_drawable_impl_x11_get_type (void)
 {
   static GType object_type = 0;
 
@@ -147,7 +172,7 @@ gdk_drawable_impl_x11_get_type (void)
       
       object_type = g_type_register_static (GDK_TYPE_DRAWABLE,
                                             "GdkDrawableImplX11",
-                                            &object_info);
+                                            &object_info, 0);
     }
   
   return object_type;
@@ -157,9 +182,12 @@ 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;
@@ -172,12 +200,105 @@ gdk_drawable_impl_x11_class_init (GdkDrawableImplX11Class *klass)
   drawable_class->draw_lines = gdk_x11_draw_lines;
   drawable_class->draw_glyphs = gdk_x11_draw_glyphs;
   drawable_class->draw_image = gdk_x11_draw_image;
+#ifdef HAVE_XFT  
+  drawable_class->_draw_pixbuf = gdk_x11_draw_pixbuf;
+#endif /* HAVE_XFT */
   
   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_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);
+}
+
+#ifdef HAVE_XFT
+gboolean
+_gdk_x11_have_render (void)
+{
+  /* This check is cheap, but if we have to do version checks, we will
+   * need to cache the result since version checks are round-trip
+   */
+  int event_base, error_base;
+
+  return XRenderQueryExtension (gdk_display, &event_base, &error_base);
+}
+
+static Picture
+gdk_x11_drawable_get_picture (GdkDrawable *drawable)
+{
+  GdkDrawableImplX11 *impl = GDK_DRAWABLE_IMPL_X11 (drawable);
+
+  if (!_gdk_x11_have_render ())
+    return None;
+  
+  if (impl->picture == None)
+    {
+      GdkVisual *visual = gdk_drawable_get_visual (drawable);
+      XRenderPictFormat *format;
+
+      if (!visual)
+       {
+         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 None;
+       }
+
+      format = XRenderFindVisualFormat (impl->xdisplay, GDK_VISUAL_XVISUAL (visual));
+      if (format)
+       impl->picture = XRenderCreatePicture (impl->xdisplay, impl->xid, format, 0, NULL);
+    }
+
+  return impl->picture;
+}
+
+static void
+gdk_x11_drawable_update_picture_clip (GdkDrawable *drawable,
+                                     GdkGC       *gc)
+{
+  GdkGCX11 *gc_private = gc ? GDK_GC_X11 (gc) : NULL;
+  GdkDrawableImplX11 *impl = GDK_DRAWABLE_IMPL_X11 (drawable);
+  Picture picture = gdk_x11_drawable_get_picture (drawable);
+
+  if (gc && gc_private->clip_region)
+    {
+      GdkRegionBox *boxes = gc_private->clip_region->rects;
+      gint n_boxes = gc_private->clip_region->numRects;
+      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;
+       }
+
+      XRenderSetPictureClipRectangles (impl->xdisplay, picture, 0, 0, rects, n_boxes);
+
+      g_free (rects);
+    }
+  else
+    {
+      XRenderPictureAttributes pa;
+      pa.clip_mask = None;
+      XRenderChangePicture (impl->xdisplay, picture, CPClipMask, &pa);
+    }
 }
+#endif  
 
 /*****************************************************
  * X11 specific implementations of generic functions *
@@ -198,8 +319,6 @@ gdk_x11_set_colormap (GdkDrawable *drawable,
                       GdkColormap *colormap)
 {
   GdkDrawableImplX11 *impl;
-  
-  g_return_if_fail (colormap != NULL);  
 
   impl = GDK_DRAWABLE_IMPL_X11 (drawable);
 
@@ -412,13 +531,19 @@ gdk_x11_draw_drawable (GdkDrawable *drawable,
   int src_depth = gdk_drawable_get_depth (src);
   int dest_depth = gdk_drawable_get_depth (drawable);
   GdkDrawableImplX11 *impl;
-
+  GdkDrawableImplX11 *src_impl;
+  
   impl = GDK_DRAWABLE_IMPL_X11 (drawable);
+
+  if (GDK_IS_DRAWABLE_IMPL_X11 (src))
+    src_impl = GDK_DRAWABLE_IMPL_X11 (src);
+  else
+    src_impl = NULL;
   
   if (src_depth == 1)
     {
       XCopyArea (impl->xdisplay,
-                GDK_DRAWABLE_XID (src),
+                 src_impl ? src_impl->xid : GDK_DRAWABLE_XID (src),
                 impl->xid,
                 GDK_GC_GET_XGC (gc),
                 xsrc, ysrc,
@@ -428,7 +553,7 @@ gdk_x11_draw_drawable (GdkDrawable *drawable,
   else if (dest_depth != 0 && src_depth == dest_depth)
     {
       XCopyArea (impl->xdisplay,
-                GDK_DRAWABLE_XID (src),
+                 src_impl ? src_impl->xid : GDK_DRAWABLE_XID (src),
                 impl->xid,
                 GDK_GC_GET_XGC (gc),
                 xsrc, ysrc,
@@ -436,7 +561,8 @@ gdk_x11_draw_drawable (GdkDrawable *drawable,
                 xdest, ydest);
     }
   else
-    g_warning ("Attempt to copy between drawables of mismatched depths!\n");
+    g_warning ("Attempt to draw a drawable with depth %d to a drawable with depth %d",
+               src_depth, dest_depth);
 }
 
 static void
@@ -564,10 +690,25 @@ gdk_x11_draw_glyphs (GdkDrawable      *drawable,
 
   impl = GDK_DRAWABLE_IMPL_X11 (drawable);
 
-  pango_x_render (impl->xdisplay,
-                  impl->xid,
-                 GDK_GC_GET_XGC (gc),
-                 font, glyphs, x, y);
+#if HAVE_XFT
+  if (PANGO_XFT_IS_FONT (font))
+    {
+      Picture src_picture;
+      Picture dest_picture;
+
+      src_picture = _gdk_x11_gc_get_fg_picture (gc);
+
+      gdk_x11_drawable_update_picture_clip (drawable, gc);
+      dest_picture = gdk_x11_drawable_get_picture (drawable);
+      
+      pango_xft_picture_render (impl->xdisplay, src_picture, dest_picture, font, glyphs, x, y);
+    }
+  else
+#endif  /* !HAVE_XFT */
+    pango_x_render (impl->xdisplay,
+                   impl->xid,
+                   GDK_GC_GET_XGC (gc),
+                   font, glyphs, x, y);
 }
 
 static void
@@ -603,3 +744,578 @@ gdk_x11_get_depth (GdkDrawable *drawable)
   return gdk_drawable_get_depth (GDK_DRAWABLE_IMPL_X11 (drawable)->wrapper);
 }
 
+static GdkVisual*
+gdk_x11_get_visual (GdkDrawable    *drawable)
+{
+  return gdk_drawable_get_visual (GDK_DRAWABLE_IMPL_X11 (drawable)->wrapper);
+}
+
+Display *
+gdk_x11_drawable_get_xdisplay (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 NULL;
+    }
+
+  return ((GdkDrawableImplX11 *)impl)->xdisplay;
+}
+
+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.
+ */
+#ifdef HAVE_XFT
+typedef enum {
+  FORMAT_NONE,
+  FORMAT_EXACT_MASK,
+  FORMAT_ARGB_MASK,
+  FORMAT_ARGB
+} FormatType;
+
+static FormatType
+select_format (Display            *xdisplay,
+              XRenderPictFormat **format,
+              XRenderPictFormat **mask)
+{
+  XRenderPictFormat pf;
+
+  if (!_gdk_x11_have_render ())
+    return 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 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 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 FORMAT_ARGB;
+
+  return 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  
+
+static void
+convert_to_format (guchar        *src_buf,
+                  gint           src_rowstride,
+                  guchar        *dest_buf,
+                  gint           dest_rowstride,
+                  FormatType     dest_format,
+                  GdkByteOrder   dest_byteorder,
+                  gint           width,
+                  gint           height)
+{
+  gint i;
+
+  if (dest_format == FORMAT_EXACT_MASK &&
+      src_rowstride == dest_rowstride)
+    {
+      memcpy (dest_buf, src_buf, height * src_rowstride);
+      return;
+    }
+  
+  for (i=0; i < height; i++)
+    {
+      switch (dest_format)
+       {
+       case FORMAT_EXACT_MASK:
+         {
+           memcpy (dest_buf + i * dest_rowstride,
+                   src_buf + i * src_rowstride,
+                   width * 4);
+           break;
+         }
+       case FORMAT_ARGB_MASK:
+         {
+           guint *p = (guint *)(src_buf + i * src_rowstride);
+           guint *q = (guint *)(dest_buf + i * dest_rowstride);
+           guint *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 & 0xff000000) >> 24) |
+                         ((*p & 0x00ffffff) << 8));
+                   q++;
+                   p++;
+                 }
+             }
+#endif /* G_BYTE_ORDER*/           
+           break;
+         }
+       case 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 FORMAT_NONE:
+         g_assert_not_reached ();
+         break;
+       }
+    }
+}
+
+static void
+draw_with_images (GdkDrawable       *drawable,
+                 GdkGC             *gc,
+                 FormatType         format_type,
+                 XRenderPictFormat *format,
+                 XRenderPictFormat *mask_format,
+                 guchar            *src_rgb,
+                 gint               src_rowstride,
+                 gint               dest_x,
+                 gint               dest_y,
+                 gint               width,
+                 gint               height)
+{
+  Display *xdisplay = GDK_DRAWABLE_IMPL_X11 (drawable)->xdisplay;
+  GdkImage *image;
+  GdkPixmap *pix;
+  GdkGC *pix_gc;
+  Picture pict;
+  Picture dest_pict;
+  Picture mask = None;
+  gint x0, y0;
+
+  pix = gdk_pixmap_new (NULL, width, height, 32);
+  pict = XRenderCreatePicture (xdisplay, 
+                              GDK_PIXMAP_XID (pix),
+                              format, 0, NULL);
+  if (mask_format)
+    mask = XRenderCreatePicture (xdisplay, 
+                                GDK_PIXMAP_XID (pix),
+                                mask_format, 0, NULL);
+
+  dest_pict = gdk_x11_drawable_get_picture (drawable);
+  
+  pix_gc = gdk_gc_new (pix);
+
+  for (y0 = 0; y0 < height; y0 += GDK_SCRATCH_IMAGE_HEIGHT)
+    {
+      gint height1 = MIN (height - y0, GDK_SCRATCH_IMAGE_HEIGHT);
+      for (x0 = 0; x0 < width; x0 += GDK_SCRATCH_IMAGE_WIDTH)
+       {
+         gint xs0, ys0;
+         
+         gint width1 = MIN (width - x0, GDK_SCRATCH_IMAGE_WIDTH);
+         
+         image = _gdk_image_get_scratch (width1, height1, 32, &xs0, &ys0);
+         
+         convert_to_format (src_rgb + y0 * src_rowstride + 4 * x0, src_rowstride,
+                            image->mem + ys0 * image->bpl + xs0 * image->bpp, image->bpl,
+                            format_type, image->byte_order, 
+                            width1, height1);
+
+         gdk_draw_image (pix, pix_gc,
+                         image, xs0, ys0, x0, y0, width1, height1);
+       }
+    }
+  
+  XRenderComposite (xdisplay, PictOpOver, pict, mask, dest_pict, 
+                   0, 0, 0, 0, dest_x, dest_y, width, height);
+
+  XRenderFreePicture (xdisplay, pict);
+  if (mask)
+    XRenderFreePicture (xdisplay, mask);
+  
+  g_object_unref (pix);
+  g_object_unref (pix_gc);
+}
+
+typedef struct _ShmPixmapInfo ShmPixmapInfo;
+
+struct _ShmPixmapInfo
+{
+  GdkImage *image;
+  Pixmap    pix;
+  Picture   pict;
+  Picture   mask;
+};
+
+/* Returns FALSE if we can't get a shm pixmap */
+static gboolean
+get_shm_pixmap_for_image (Display           *xdisplay,
+                         GdkImage          *image,
+                         XRenderPictFormat *format,
+                         XRenderPictFormat *mask_format,
+                         Pixmap            *pix,
+                         Picture           *pict,
+                         Picture           *mask)
+{
+  ShmPixmapInfo *info;
+  
+  if (image->type != GDK_IMAGE_SHARED)
+    return FALSE;
+  
+  info = g_object_get_data (G_OBJECT (image), "gdk-x11-shm-pixmap");
+  if (!info)
+    {
+      *pix = _gdk_x11_image_get_shm_pixmap (image);
+      
+      if (!*pix)
+       return FALSE;
+      
+      info = g_new (ShmPixmapInfo, 1);
+      info->pix = *pix;
+      
+      info->pict = XRenderCreatePicture (xdisplay, info->pix,
+                                        format, 0, NULL);
+      if (mask_format)
+       info->mask = XRenderCreatePicture (xdisplay, info->pix,
+                                          mask_format, 0, NULL);
+      else
+       info->mask = None;
+
+      g_object_set_data (G_OBJECT (image), "gdk-x11-shm-pixmap", info);
+    }
+
+  *pix = info->pix;
+  *pict = info->pict;
+  *mask = info->mask;
+
+  return TRUE;
+}
+
+#ifdef USE_SHM
+/* Returns FALSE if drawing with ShmPixmaps is not possible */
+static gboolean
+draw_with_pixmaps (GdkDrawable       *drawable,
+                  GdkGC             *gc,
+                  FormatType         format_type,
+                  XRenderPictFormat *format,
+                  XRenderPictFormat *mask_format,
+                  guchar            *src_rgb,
+                  gint               src_rowstride,
+                  gint               dest_x,
+                  gint               dest_y,
+                  gint               width,
+                  gint               height)
+{
+  Display *xdisplay = GDK_DRAWABLE_IMPL_X11 (drawable)->xdisplay;
+  GdkImage *image;
+  Pixmap pix;
+  Picture pict;
+  Picture dest_pict;
+  Picture mask = None;
+  gint x0, y0;
+
+  dest_pict = gdk_x11_drawable_get_picture (drawable);
+  
+  for (y0 = 0; y0 < height; y0 += GDK_SCRATCH_IMAGE_HEIGHT)
+    {
+      gint height1 = MIN (height - y0, GDK_SCRATCH_IMAGE_HEIGHT);
+      for (x0 = 0; x0 < width; x0 += GDK_SCRATCH_IMAGE_WIDTH)
+       {
+         gint xs0, ys0;
+         
+         gint width1 = MIN (width - x0, GDK_SCRATCH_IMAGE_WIDTH);
+         
+         image = _gdk_image_get_scratch (width1, height1, 32, &xs0, &ys0);
+         if (!get_shm_pixmap_for_image (xdisplay, image, format, mask_format, &pix, &pict, &mask))
+           return FALSE;
+
+         convert_to_format (src_rgb + y0 * src_rowstride + 4 * x0, src_rowstride,
+                            image->mem + ys0 * image->bpl + xs0 * image->bpp, image->bpl,
+                            format_type, image->byte_order, 
+                            width1, height1);
+
+         XRenderComposite (xdisplay, PictOpOver, pict, mask, dest_pict, 
+                           xs0, ys0, xs0, ys0, x0 + dest_x, y0 + dest_y,
+                           width1, height1);
+       }
+    }
+
+  return TRUE;
+}
+#endif
+
+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)
+{
+  Display *xdisplay = GDK_DRAWABLE_IMPL_X11 (drawable)->xdisplay;
+  FormatType format_type;
+  XRenderPictFormat *format, *mask_format;
+  gint rowstride;
+#ifdef USE_SHM  
+  gboolean use_pixmaps = TRUE;
+#endif /* USE_SHM */
+    
+  format_type = select_format (xdisplay, &format, &mask_format);
+
+  if (format_type == FORMAT_NONE ||
+      !gdk_pixbuf_get_has_alpha (pixbuf) ||
+      (dither == GDK_RGB_DITHER_MAX && gdk_drawable_get_depth (drawable) != 24))
+    {
+      GdkDrawable *wrapper = GDK_DRAWABLE_IMPL_X11 (drawable)->wrapper;
+      GDK_DRAWABLE_CLASS (parent_class)->_draw_pixbuf (wrapper, gc, pixbuf,
+                                                      src_x, src_y, dest_x, dest_y,
+                                                      width, height,
+                                                      dither, x_dither, y_dither);
+      return;
+    }
+
+  gdk_x11_drawable_update_picture_clip (drawable, gc);
+
+  rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+
+#ifdef USE_SHM
+  if (use_pixmaps)
+    {
+      if (!draw_with_pixmaps (drawable, gc,
+                             format_type, format, mask_format,
+                             gdk_pixbuf_get_pixels (pixbuf) + src_y * rowstride + src_x * 4,
+                             rowstride,
+                             dest_x, dest_y, width, height))
+       use_pixmaps = FALSE;
+    }
+
+  if (!use_pixmaps)
+#endif /* USE_SHM */
+    draw_with_images (drawable, gc,
+                     format_type, format, mask_format,
+                     gdk_pixbuf_get_pixels (pixbuf) + src_y * rowstride + src_x * 4,
+                     rowstride,
+                     dest_x, dest_y, width, height);
+}
+#endif /* HAVE_XFT */