Minor fixes that were needed for the Gimp/GdkRgb integration.

ChangeLog

@@ -1,3 +1,16 @@
+1998-08-19  Raph Levien  <raph@gimp.org>
+
+	* gdk/gdkrgb.c: fixed some bugs in the 565_d mode, and added a
+	4bpp static_color mode (for vga displays). Also fixed a '64' value
+	in the dither matrix, which was causing one pixel out of 16k to be
+	dithered wrong.
+
+	* gtk/gtkpreview.{c,h}: Changed it to work with GdkRgb, gutting
+	most of the contents. This is an API change - any apps that relied
+	on the internal structure of GtkPreview will need some change -
+	most notably in the use of reserved colors. The Gimp needed
+	changes in this regard.
+
 Wed Aug 19 00:11:14 1998  Tim Janik  <timj@gtk.org>
 
 	* gtk/gtkmain.c (gtk_init): allow argument parsing in gtk without

ChangeLog.pre-2-0

@@ -1,3 +1,16 @@
+1998-08-19  Raph Levien  <raph@gimp.org>
+
+	* gdk/gdkrgb.c: fixed some bugs in the 565_d mode, and added a
+	4bpp static_color mode (for vga displays). Also fixed a '64' value
+	in the dither matrix, which was causing one pixel out of 16k to be
+	dithered wrong.
+
+	* gtk/gtkpreview.{c,h}: Changed it to work with GdkRgb, gutting
+	most of the contents. This is an API change - any apps that relied
+	on the internal structure of GtkPreview will need some change -
+	most notably in the use of reserved colors. The Gimp needed
+	changes in this regard.
+
 Wed Aug 19 00:11:14 1998  Tim Janik  <timj@gtk.org>
 
 	* gtk/gtkmain.c (gtk_init): allow argument parsing in gtk without

ChangeLog.pre-2-10

@@ -1,3 +1,16 @@
+1998-08-19  Raph Levien  <raph@gimp.org>
+
+	* gdk/gdkrgb.c: fixed some bugs in the 565_d mode, and added a
+	4bpp static_color mode (for vga displays). Also fixed a '64' value
+	in the dither matrix, which was causing one pixel out of 16k to be
+	dithered wrong.
+
+	* gtk/gtkpreview.{c,h}: Changed it to work with GdkRgb, gutting
+	most of the contents. This is an API change - any apps that relied
+	on the internal structure of GtkPreview will need some change -
+	most notably in the use of reserved colors. The Gimp needed
+	changes in this regard.
+
 Wed Aug 19 00:11:14 1998  Tim Janik  <timj@gtk.org>
 
 	* gtk/gtkmain.c (gtk_init): allow argument parsing in gtk without

ChangeLog.pre-2-2

@@ -1,3 +1,16 @@
+1998-08-19  Raph Levien  <raph@gimp.org>
+
+	* gdk/gdkrgb.c: fixed some bugs in the 565_d mode, and added a
+	4bpp static_color mode (for vga displays). Also fixed a '64' value
+	in the dither matrix, which was causing one pixel out of 16k to be
+	dithered wrong.
+
+	* gtk/gtkpreview.{c,h}: Changed it to work with GdkRgb, gutting
+	most of the contents. This is an API change - any apps that relied
+	on the internal structure of GtkPreview will need some change -
+	most notably in the use of reserved colors. The Gimp needed
+	changes in this regard.
+
 Wed Aug 19 00:11:14 1998  Tim Janik  <timj@gtk.org>
 
 	* gtk/gtkmain.c (gtk_init): allow argument parsing in gtk without

ChangeLog.pre-2-4

@@ -1,3 +1,16 @@
+1998-08-19  Raph Levien  <raph@gimp.org>
+
+	* gdk/gdkrgb.c: fixed some bugs in the 565_d mode, and added a
+	4bpp static_color mode (for vga displays). Also fixed a '64' value
+	in the dither matrix, which was causing one pixel out of 16k to be
+	dithered wrong.
+
+	* gtk/gtkpreview.{c,h}: Changed it to work with GdkRgb, gutting
+	most of the contents. This is an API change - any apps that relied
+	on the internal structure of GtkPreview will need some change -
+	most notably in the use of reserved colors. The Gimp needed
+	changes in this regard.
+
 Wed Aug 19 00:11:14 1998  Tim Janik  <timj@gtk.org>
 
 	* gtk/gtkmain.c (gtk_init): allow argument parsing in gtk without

ChangeLog.pre-2-6

@@ -1,3 +1,16 @@
+1998-08-19  Raph Levien  <raph@gimp.org>
+
+	* gdk/gdkrgb.c: fixed some bugs in the 565_d mode, and added a
+	4bpp static_color mode (for vga displays). Also fixed a '64' value
+	in the dither matrix, which was causing one pixel out of 16k to be
+	dithered wrong.
+
+	* gtk/gtkpreview.{c,h}: Changed it to work with GdkRgb, gutting
+	most of the contents. This is an API change - any apps that relied
+	on the internal structure of GtkPreview will need some change -
+	most notably in the use of reserved colors. The Gimp needed
+	changes in this regard.
+
 Wed Aug 19 00:11:14 1998  Tim Janik  <timj@gtk.org>
 
 	* gtk/gtkmain.c (gtk_init): allow argument parsing in gtk without

ChangeLog.pre-2-8

@@ -1,3 +1,16 @@
+1998-08-19  Raph Levien  <raph@gimp.org>
+
+	* gdk/gdkrgb.c: fixed some bugs in the 565_d mode, and added a
+	4bpp static_color mode (for vga displays). Also fixed a '64' value
+	in the dither matrix, which was causing one pixel out of 16k to be
+	dithered wrong.
+
+	* gtk/gtkpreview.{c,h}: Changed it to work with GdkRgb, gutting
+	most of the contents. This is an API change - any apps that relied
+	on the internal structure of GtkPreview will need some change -
+	most notably in the use of reserved colors. The Gimp needed
+	changes in this regard.
+
 Wed Aug 19 00:11:14 1998  Tim Janik  <timj@gtk.org>
 
 	* gtk/gtkmain.c (gtk_init): allow argument parsing in gtk without

gdk/gdkrgb.c

@@ -20,7 +20,7 @@
 /* For more information on GdkRgb, see http://www.levien.com/gdkrgb/
 
    Raph Levien <raph@acm.org>
-*/
+   */
 
 #include <math.h>
 #include <stdio.h>
@@ -125,7 +125,7 @@ gdk_rgb_cmap_fail (const char *msg, GdkColormap *cmap, gulong *pixels)
   gint i;
 
 #ifdef VERBOSE
-  g_message ("%s", msg);
+  g_print ("%s", msg);
 #endif
   n_free = 0;
   for (i = 0; i < 256; i++)
@@ -154,7 +154,7 @@ gdk_rgb_make_colorcube (gulong *pixels, gint nr, gint ng, gint nb)
     {
       colorcube[i] = pixels[rt[i >> 8] + gt[(i >> 4) & 0x0f] + bt[i & 0x0f]];
 #ifdef VERBOSE
-      g_message ("%03x %02x %x %x %x", i, colorcube[i], rt[i >> 8], gt[(i >> 4) & 0x0f], bt[i & 0x0f]);
+      g_print ("%03x %02x %x %x %x\n", i, colorcube[i], rt[i >> 8], gt[(i >> 4) & 0x0f], bt[i & 0x0f]);
 #endif
     }
 }
@@ -232,7 +232,7 @@ gdk_rgb_try_colormap (gint nr, gint ng, gint nb)
 	  colors_needed--;
 	color = cmap->colors[i];
 	if (!gdk_color_alloc (cmap, &color))
-	    return gdk_rgb_cmap_fail ("error allocating system color",
+	  return gdk_rgb_cmap_fail ("error allocating system color\n",
 				    cmap, pixels);
 	pixels[idx] = color.pixel; /* which is almost certainly i */
 	best[idx] = d2;
@@ -247,7 +247,7 @@ gdk_rgb_try_colormap (gint nr, gint ng, gint nb)
 	  char tmp_str[80];
 	  
 	  sprintf (tmp_str,
-		   "%d %d %d colormap failed (in gdk_colors_alloc)",
+		   "%d %d %d colormap failed (in gdk_colors_alloc)\n",
 		   nr, ng, nb);
 	  return gdk_rgb_cmap_fail (tmp_str, cmap, pixels);
 	}
@@ -271,11 +271,12 @@ gdk_rgb_try_colormap (gint nr, gint ng, gint nb)
 	      color.blue = 65535 * pow (color.blue / 65535.0, 0.5);
 #endif
 
+	      /* This should be a raw XAllocColor call */
 	      if (!gdk_color_alloc (cmap, &color))
 		{
 		  char tmp_str[80];
 
-		  sprintf (tmp_str, "%d %d %d colormap failed",
+		  sprintf (tmp_str, "%d %d %d colormap failed\n",
 			   nr, ng, nb);
 		  return gdk_rgb_cmap_fail (tmp_str,
 					    cmap, pixels);
@@ -283,7 +284,7 @@ gdk_rgb_try_colormap (gint nr, gint ng, gint nb)
 	      pixels[i] = color.pixel;
 	    }
 #ifdef VERBOSE
-	  g_message ("%d: %lx", i, pixels[i]);
+	  g_print ("%d: %lx\n", i, pixels[i]);
 #endif
 	}
 
@@ -320,6 +321,31 @@ gdk_rgb_do_colormaps (void)
   return FALSE;
 }
 
+/* Make a 2 x 2 x 2 colorcube */
+static void
+gdk_rgb_colorcube_222 (void)
+{
+  int i;
+  GdkColor color;
+  GdkColormap *cmap;
+
+  if (image_info->cmap_alloced)
+    cmap = image_info->cmap;
+  else
+    cmap = gdk_colormap_get_system ();
+
+  colorcube_d = g_new (guchar, 512);
+
+  for (i = 0; i < 8; i++)
+    {
+      color.red = ((i & 4) >> 2) * 65535;
+      color.green = ((i & 2) >> 1) * 65535;
+      color.blue = (i & 1) * 65535;
+      gdk_color_alloc (cmap, &color);
+      colorcube_d[((i & 4) << 4) | ((i & 2) << 2) | (i & 1)] = color.pixel;
+    }
+}
+
 void
 gdk_rgb_set_verbose (gboolean verbose)
 {
@@ -386,10 +412,15 @@ gdk_rgb_score_visual (GdkVisual *visual)
       else if (visual->depth == 8)
 	quality = 4;
     }
-  else if (visual->type == GDK_VISUAL_PSEUDO_COLOR)
+  else if (visual->type == GDK_VISUAL_PSEUDO_COLOR ||
+	   visual->type == GDK_VISUAL_STATIC_COLOR)
     {
       if (visual->depth == 8)
 	quality = 4;
+      else if (visual->depth == 4)
+	quality = 2;
+      else if (visual->depth == 1)
+	quality = 1;
     }
   else if (visual->type == GDK_VISUAL_STATIC_GRAY
 #ifdef ENABLE_GRAYSCALE
@@ -413,7 +444,7 @@ gdk_rgb_score_visual (GdkVisual *visual)
   pseudo = (visual->type == GDK_VISUAL_PSEUDO_COLOR);
 
   if (gdk_rgb_verbose)
-    g_message ("Visual 0x%x, type = %s, depth = %d, %x:%x:%x%s; score=%x",
+    g_print ("Visual 0x%x, type = %s, depth = %d, %x:%x:%x%s; score=%x\n",
 	     (gint)(((GdkVisualPrivate *)visual)->xvisual->visualid),
 	     visual_names[visual->type],
 	     visual->depth,
@@ -473,7 +504,7 @@ gdk_rgb_set_gray_cmap (GdkColormap *cmap)
       status = gdk_color_alloc (cmap, &color);
       pixels[i] = color.pixel;
 #ifdef VERBOSE
-      g_message ("allocating pixel %d, %x %x %x, result %d",
+      g_print ("allocating pixel %d, %x %x %x, result %d\n",
 	       color.pixel, color.red, color.green, color.blue, status);
 #endif
     }
@@ -536,7 +567,11 @@ gdk_rgb_init (void)
 
       gdk_rgb_choose_visual ();
 
-      if (image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR)
+      if (image_info->visual->depth == 4)
+	{
+	  gdk_rgb_colorcube_222 ();
+	}
+      else if (image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR)
 	{
 	  if (gdk_rgb_install_cmap ||
 	      image_info->visual != gdk_visual_get_system ())
@@ -551,7 +586,7 @@ gdk_rgb_init (void)
 	      gdk_rgb_do_colormaps ();
 	    }
 	  if (gdk_rgb_verbose)
-	    g_message ("color cube: %d x %d x %d",
+	    g_print ("color cube: %d x %d x %d\n",
 		     image_info->nred_shades,
 		     image_info->ngreen_shades,
 		     image_info->nblue_shades);
@@ -602,10 +637,17 @@ gdk_rgb_xpixel_from_rgb (guint32 rgb)
     pixel = colorcube[((rgb & 0xf00000) >> 12) |
 		     ((rgb & 0xf000) >> 8) |
 		     ((rgb & 0xf0) >> 4)];
+  else if (image_info->visual->depth == 4 &&
+	   image_info->visual->type == GDK_VISUAL_STATIC_COLOR)
+    {
+      pixel = colorcube_d[((rgb & 0x800000) >> 17) |
+			 ((rgb & 0x8000) >> 12) |
+			 ((rgb & 0x80) >> 7)];
+    }
   else
     {
 #ifdef VERBOSE
-      g_message ("shift, prec: r %d %d g %d %d b %d %d",
+      g_print ("shift, prec: r %d %d g %d %d b %d %d\n",
 	       image_info->visual->red_shift,
 	       image_info->visual->red_prec,
 	       image_info->visual->green_shift,
@@ -623,8 +665,6 @@ gdk_rgb_xpixel_from_rgb (guint32 rgb)
 	       (((rgb & 0xff) >>
 		 (8 - image_info->visual->blue_prec)) <<
 		image_info->visual->blue_shift));
-      
-      ;
     }
 
   return pixel;
@@ -672,7 +712,7 @@ gdk_rgb_convert_8 (GdkImage *image,
     {
       bp2 = bptr;
       obptr = obuf;
-      if (width < 8 || (((unsigned long)obuf | (unsigned long) bp2) & 3))
+      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
 	{
 	  for (x = 0; x < width; x++)
 	    {
@@ -877,7 +917,7 @@ static guchar DM[128][128] =
   { 46, 2, 56, 11, 41, 1, 49, 6, 27, 47, 2, 48, 5, 32, 37, 3, 13, 19, 32, 1, 55, 28, 60, 17, 43, 59, 32, 20, 49, 16, 55, 23, 14, 46, 2, 36, 6, 30, 20, 49, 12, 47, 35, 14, 21, 60, 29, 14, 35, 24, 46, 1, 56, 29, 53, 8, 33, 23, 56, 1, 35, 46, 20, 39, 26, 4, 53, 28, 17, 38, 60, 34, 48, 9, 55, 15, 46, 7, 41, 31, 60, 24, 16, 36, 1, 59, 19, 52, 35, 6, 55, 11, 59, 33, 7, 57, 4, 29, 48, 1, 19, 26, 37, 30, 18, 63, 37, 6, 59, 1, 40, 24, 56, 33, 46, 22, 35, 7, 24, 53, 39, 5, 26, 45, 55, 18, 62, 7 },
   { 20, 60, 29, 34, 20, 62, 33, 52, 10, 36, 13, 60, 41, 21, 50, 27, 56, 49, 8, 51, 21, 45, 11, 48, 8, 23, 53, 3, 29, 44, 5, 52, 9, 32, 50, 17, 43, 56, 3, 38, 24, 10, 62, 25, 51, 9, 33, 49, 61, 7, 30, 62, 22, 19, 2, 42, 63, 5, 49, 18, 60, 15, 52, 7, 43, 56, 23, 50, 5, 50, 2, 20, 41, 30, 1, 52, 22, 61, 14, 26, 3, 43, 53, 7, 47, 28, 11, 14, 23, 58, 33, 25, 47, 13, 50, 17, 40, 54, 34, 60, 41, 6, 59, 14, 50, 7, 25, 55, 20, 42, 51, 8, 27, 4, 16, 60, 28, 50, 44, 3, 22, 49, 63, 12, 33, 1, 43, 31 },
   { 36, 5, 46, 8, 44, 24, 13, 39, 25, 57, 31, 18, 8, 52, 10, 45, 6, 30, 36, 24, 63, 4, 33, 26, 57, 40, 15, 56, 37, 12, 40, 25, 37, 58, 11, 63, 21, 45, 16, 60, 31, 53, 18, 33, 3, 45, 23, 0, 20, 54, 40, 15, 50, 38, 60, 16, 25, 42, 29, 38, 7, 41, 25, 62, 18, 33, 8, 35, 42, 16, 32, 56, 12, 39, 59, 19, 34, 9, 49, 38, 57, 12, 21, 50, 14, 40, 61, 44, 50, 9, 49, 19, 3, 29, 35, 62, 12, 24, 7, 18, 52, 32, 10, 46, 21, 41, 32, 11, 36, 29, 14, 34, 60, 38, 54, 11, 41, 14, 19, 57, 32, 16, 7, 41, 51, 25, 14, 57 },
-  { 53, 18, 26, 50, 15, 58, 4, 63, 17, 43, 7, 40, 61, 35, 15, 41, 23, 60, 16, 38, 14, 42, 19, 50, 0, 31, 10, 46, 27, 63, 18, 60, 0, 20, 29, 39, 8, 26, 37, 5, 42, 0, 44, 39, 57, 17, 58, 41, 28, 37, 4, 32, 9, 44, 12, 31, 54, 10, 59, 14, 27, 53, 12, 36, 0, 47, 13, 64, 21, 58, 10, 24, 50, 27, 4, 26, 44, 53, 31, 0, 18, 42, 29, 33, 57, 4, 32, 26, 0, 38, 16, 61, 41, 53, 20, 0, 42, 44, 49, 27, 10, 56, 39, 0, 57, 15, 53, 49, 3, 61, 22, 47, 17, 5, 49, 26, 2, 63, 39, 10, 47, 27, 37, 23, 4, 59, 38, 10 },
+  { 53, 18, 26, 50, 15, 58, 4, 63, 17, 43, 7, 40, 61, 35, 15, 41, 23, 60, 16, 38, 14, 42, 19, 50, 0, 31, 10, 46, 27, 63, 18, 60, 0, 20, 29, 39, 8, 26, 37, 5, 42, 0, 44, 39, 57, 17, 58, 41, 28, 37, 4, 32, 9, 44, 12, 31, 54, 10, 59, 14, 27, 53, 12, 36, 0, 47, 13, 63, 21, 58, 10, 24, 50, 27, 4, 26, 44, 53, 31, 0, 18, 42, 29, 33, 57, 4, 32, 26, 0, 38, 16, 61, 41, 53, 20, 0, 42, 44, 49, 27, 10, 56, 39, 0, 57, 15, 53, 49, 3, 61, 22, 47, 17, 5, 49, 26, 2, 63, 39, 10, 47, 27, 37, 23, 4, 59, 38, 10 },
   { 23, 39, 61, 3, 37, 28, 48, 31, 0, 34, 51, 23, 2, 26, 58, 0, 53, 11, 46, 1, 57, 29, 52, 14, 37, 61, 21, 35, 2, 49, 7, 34, 47, 55, 4, 33, 54, 13, 58, 52, 19, 50, 22, 7, 13, 29, 36, 11, 51, 17, 60, 25, 55, 4, 34, 51, 0, 35, 20, 48, 32, 3, 51, 30, 59, 28, 40, 3, 46, 29, 54, 43, 7, 62, 47, 11, 39, 4, 23, 46, 55, 8, 63, 5, 25, 37, 18, 46, 21, 56, 31, 5, 36, 8, 45, 58, 26, 15, 2, 36, 47, 21, 29, 44, 25, 34, 3, 27, 43, 10, 52, 0, 45, 30, 24, 36, 43, 18, 34, 59, 0, 52, 61, 15, 44, 19, 30, 49 },
   { 0, 27, 12, 43, 54, 9, 22, 53, 21, 46, 15, 55, 29, 47, 20, 33, 39, 28, 59, 35, 9, 44, 5, 24, 47, 7, 52, 17, 56, 22, 30, 42, 14, 26, 45, 18, 49, 1, 24, 34, 11, 27, 55, 32, 61, 47, 2, 56, 6, 44, 13, 47, 36, 27, 58, 22, 16, 47, 40, 4, 57, 38, 21, 45, 16, 9, 56, 26, 11, 38, 0, 22, 36, 17, 33, 57, 16, 30, 62, 15, 35, 40, 20, 45, 59, 10, 54, 8, 63, 13, 52, 27, 22, 57, 28, 12, 32, 51, 55, 22, 63, 4, 16, 54, 12, 62, 45, 19, 58, 13, 32, 40, 20, 56, 7, 57, 9, 54, 6, 29, 42, 21, 8, 55, 35, 47, 6, 41 },
   { 56, 33, 58, 32, 19, 35, 42, 6, 59, 11, 38, 5, 49, 12, 62, 7, 52, 17, 5, 25, 54, 20, 61, 31, 54, 27, 41, 11, 44, 5, 59, 12, 36, 51, 10, 61, 28, 41, 48, 9, 43, 63, 5, 40, 20, 8, 49, 26, 34, 21, 58, 1, 18, 45, 7, 39, 61, 26, 8, 50, 23, 10, 63, 5, 55, 37, 19, 49, 52, 15, 59, 47, 13, 54, 1, 25, 42, 58, 10, 48, 3, 27, 50, 1, 17, 48, 34, 41, 16, 40, 2, 45, 10, 39, 17, 61, 5, 38, 19, 9, 41, 31, 60, 38, 5, 23, 36, 8, 30, 55, 24, 63, 12, 48, 14, 51, 31, 20, 45, 25, 12, 50, 32, 2, 28, 11, 62, 14 },
@@ -937,7 +977,7 @@ gdk_rgb_preprocess_dm_565 (void)
 	  dith = DM[0][i] >> 3;
 	  DM_565[i] = (dith << 20) | dith | (((7 - dith) >> 1) << 10);
 #ifdef VERBOSE
-	  g_message ("%i %x %x", i, dith, DM_565[i]);
+	  g_print ("%i %x %x\n", i, dith, DM_565[i]);
 #endif
 	}
     }
@@ -1144,7 +1184,7 @@ gdk_rgb_convert_565 (GdkImage *image,
     {
       bp2 = bptr;
       obptr = obuf;
-      if (width < 8 || (((unsigned long)obuf | (unsigned long) bp2) & 3))
+      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
 	{
 	  for (x = 0; x < width; x++)
 	    {
@@ -1275,7 +1315,7 @@ gdk_rgb_convert_565_gray (GdkImage *image,
     {
       bp2 = bptr;
       obptr = obuf;
-      if (width < 8 || (((unsigned long)obuf | (unsigned long) bp2) & 3))
+      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
 	{
 	  for (x = 0; x < width; x++)
 	    {
@@ -1417,7 +1457,7 @@ gdk_rgb_convert_565_d (GdkImage *image,
       guint32 *dmp = DM_565 + ((y & (DM_HEIGHT - 1)) << DM_WIDTH_SHIFT);
       bp2 = bptr;
       obptr = obuf;
-      if (width < 8 || (((unsigned long)obuf | (unsigned long) bp2) & 3))
+      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
 	{
 	  for (x = x_align; x < width; x++)
 	    {
@@ -1429,7 +1469,7 @@ gdk_rgb_convert_565_d (GdkImage *image,
 		- ((rgb & 0x1e0001e0) >> 5)
 		- ((rgb & 0x00070000) >> 6);
 
-	      ((unsigned short *)obuf)[0] =
+	      ((unsigned short *)obptr)[0] =
 		((rgb & 0x0f800000) >> 12) |
 		((rgb & 0x0003f000) >> 7) |
 		((rgb & 0x000000f8) >> 3);
@@ -1507,7 +1547,7 @@ gdk_rgb_convert_565_d (GdkImage *image,
 		- ((rgb & 0x1e0001e0) >> 5)
 		- ((rgb & 0x00070000) >> 6);
 
-	      ((unsigned short *)obuf)[0] =
+	      ((unsigned short *)obptr)[0] =
 		((rgb & 0x0f800000) >> 12) |
 		((rgb & 0x0003f000) >> 7) |
 		((rgb & 0x000000f8) >> 3);
@@ -1679,7 +1719,7 @@ gdk_rgb_convert_888_lsb (GdkImage *image,
     {
       bp2 = bptr;
       obptr = obuf;
-      if (width < 8 || (((unsigned long)obuf | (unsigned long) bp2) & 3))
+      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
 	{
 	  for (x = 0; x < width; x++)
 	    {
@@ -2068,6 +2108,70 @@ gdk_rgb_convert_truecolor_msb_d (GdkImage *image,
     }
 }
 
+#define IMAGE_8BPP
+static void
+gdk_rgb_convert_4 (GdkImage *image,
+		   gint x0, gint y0, gint width, gint height,
+		   guchar *buf, int rowstride,
+		   gint x_align, gint y_align,
+		   GdkRgbCmap *cmap)
+{
+  int x, y;
+  gint bpl;
+  guchar *obuf, *obptr;
+  guchar *bptr, *bp2;
+  gint r, g, b;
+  guchar *dmp;
+  gint dith;
+  guchar pix0, pix1;
+
+  bptr = buf;
+  bpl = image->bpl;
+  obuf = ((guchar *)image->mem) + y0 * bpl + x0;
+  for (y = 0; y < height; y++)
+    {
+      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
+      bp2 = bptr;
+      obptr = obuf;
+#ifdef IMAGE_8BPP
+      for (x = 0; x < width; x += 1)
+	{
+	  r = *bp2++;
+	  g = *bp2++;
+	  b = *bp2++;
+	  dith = (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) | 3;
+	  obptr[0] = colorcube_d[(((r + dith) & 0x100) >> 2) |
+				(((g + 258 - dith) & 0x100) >> 5) |
+				(((b + dith) & 0x100) >> 8)];
+	  obptr++;
+	}
+#else
+      for (x = 0; x < width; x += 2)
+	{
+	  r = *bp2++;
+	  g = *bp2++;
+	  b = *bp2++;
+	  dith = (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) | 3;
+	  pix0 = colorcube_d[(((r + dith) & 0x100) >> 2) |
+			    (((g + dith) & 0x100) >> 5) |
+			    (((b + dith) & 0x100) >> 8)];
+	  r = *bp2++;
+	  g = *bp2++;
+	  b = *bp2++;
+	  dith = (dmp[(x_align + x + 1) & (DM_WIDTH - 1)] << 2) | 3;
+	  pix1 = colorcube_d[(((r + dith) & 0x100) >> 2) |
+			    (((g + dith) & 0x100) >> 5) |
+			    (((b + dith) & 0x100) >> 8)];
+	  obptr[0] = (pix0 << 4) | pix1;
+	  obptr++;
+	}
+#endif
+      bptr += rowstride;
+      obuf += bpl;
+    }
+}
+
+
 /* Returns a pointer to the stage buffer. */
 static guchar *
 gdk_rgb_ensure_stage (void)
@@ -2397,6 +2501,10 @@ gdk_rgb_select_conv (GdkImage *image)
       conv = gdk_rgb_convert_gray8;
       conv_gray = gdk_rgb_convert_gray8_gray;
     }
+  else if (depth == 4)
+    {
+      conv = gdk_rgb_convert_4;
+    }
 
   if (conv_d == NULL)
     conv_d = conv;
@@ -2441,7 +2549,7 @@ gdk_rgb_alloc_scratch_image (void)
       gdk_flush ();
 #endif
 #ifdef VERBOSE
-      g_message ("flush, %d puts since last flush", sincelast);
+      g_print ("flush, %d puts since last flush\n", sincelast);
       sincelast = 0;
 #endif
       static_image_idx = 0;
@@ -2519,7 +2627,7 @@ gdk_rgb_alloc_scratch (gint width, gint height, gint *x0, gint *y0)
     }
   image = static_image[idx];
 #ifdef VERBOSE
-  g_message ("index %d, x %d, y %d (%d x %d)", idx, *x0, *y0, width, height);
+  g_print ("index %d, x %d, y %d (%d x %d)\n", idx, *x0, *y0, width, height);
   sincelast++;
 #endif
   return image;
@@ -2668,7 +2776,7 @@ gdk_rgb_cmap_new (guint32 *colors, gint n_colors)
 		   ((rgb & 0xf000) >> 8) |
 		   ((rgb & 0xf0) >> 4);
 #ifdef VERBOSE
-	g_message ("%d %x %x %d", i, j, colorcube[j]);
+	g_print ("%d %x %x %d\n", i, j, colorcube[j]);
 #endif
 	cmap->lut[i] = colorcube[j];
       }

gtk/gtkpreview.h

@@ -46,6 +46,11 @@ struct _GtkPreview
   guint16 buffer_width;
   guint16 buffer_height;
 
+  guint16 bpp;
+  guint16 rowstride;
+
+  GdkRgbDither dither;
+
   guint type : 1;
   guint expand : 1;
 };
@@ -55,28 +60,8 @@ struct _GtkPreviewInfo
   GdkVisual *visual;
   GdkColormap *cmap;
 
-  gulong *color_pixels;
+  guchar *lookup;
-  gulong *gray_pixels;
-  gulong *reserved_pixels;
 
-  gulong *lookup_red;
-  gulong *lookup_green;
-  gulong *lookup_blue;
-
-  GtkDitherInfo *dither_red;
-  GtkDitherInfo *dither_green;
-  GtkDitherInfo *dither_blue;
-  GtkDitherInfo *dither_gray;
-  guchar ***dither_matrix;
-
-  guint nred_shades;
-  guint ngreen_shades;
-  guint nblue_shades;
-  guint ngray_shades;
-  guint nreserved;
-
-  guint bpp;
-  gint cmap_alloced;
   gdouble gamma;
 };
 
@@ -92,7 +77,6 @@ struct _GtkPreviewClass
 
   GtkPreviewInfo info;
 
-  GdkImage *image;
 };
 
 
@@ -111,6 +95,7 @@ void            gtk_preview_put                (GtkPreview      *preview,
 						gint             desty,
 						gint             width,
 						gint             height);
+/* gtk_preview_put_row is broken */
 void            gtk_preview_put_row            (GtkPreview      *preview,
 						guchar          *src,
 						guchar          *dest,
@@ -132,6 +117,8 @@ void            gtk_preview_set_color_cube     (guint            nred_shades,
 						guint            ngray_shades);
 void            gtk_preview_set_install_cmap   (gint             install_cmap);
 void            gtk_preview_set_reserved       (gint             nreserved);
+void            gtk_preview_set_dither         (GtkPreview      *preview,
+						GdkRgbDither     dither);
 GdkVisual*      gtk_preview_get_visual         (void);
 GdkColormap*    gtk_preview_get_cmap           (void);
 GtkPreviewInfo* gtk_preview_get_info           (void);