File gtk2-bgo625202-30-bit-drawables-remain-black.patch of Package gtk2

From fb01c5ea4c5b9f0c2b0d2b2d9c926cf1caea27c0 Mon Sep 17 00:00:00 2001
From: Damien Leone <dleone@nvidia.nvidia.com>
Date: Mon, 12 Sep 2011 09:53:00 -0700
Subject: [PATCH] Bug 625202 - 30-bit drawables remain black

This patch adds support for 10-10-10 bitmask BGR conversion at
depths 30 and 32 by preventing gdk_rgb_select_conv() from failing
back to the gdk_rgb_convert_32_generic() conversion function.

Since GdkImage codes R, G and B channels in a char, we replicate
the two most significant bits to the two least significant ones
such that all 10 bits are used (i.e. all bits are set to 1 for
white color).
---
 gdk/gdkrgb.c |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 47 insertions(+), 0 deletions(-)

diff --git a/gdk/gdkrgb.c b/gdk/gdkrgb.c
index 6e32bab..93ef6ab 100644
--- a/gdk/gdkrgb.c
+++ b/gdk/gdkrgb.c
@@ -2242,6 +2242,48 @@ gdk_rgb_convert_8880_br (GdkRgbInfo *image_info, GdkImage *image,
     }
 }
 
+static void
+gdk_rgb_convert_0AAA_br (GdkRgbInfo *image_info, GdkImage *image,
+			 gint x0, gint y0, gint width, gint height,
+			 const guchar *buf, int rowstride,
+			 gint x_align, gint y_align, GdkRgbCmap *cmap)
+{
+  int y, w;
+  guchar *obuf, *p;
+  gint bpl;
+  const guchar *bptr, *bp2;
+  guchar r, g, b;
+
+  bptr = buf;
+  bpl = image->bpl;
+  obuf = ((guchar *)image->mem) + y0 * bpl + x0 * 4;
+
+  for (y = 0; y < height; y++)
+	{
+	  bp2 = bptr;
+	  p = obuf;
+	  w = width;
+	  while (w--)
+		{
+		  r = *bp2++;
+		  g = *bp2++;
+		  b = *bp2++;
+
+		  /* Since the R, G and B channels are coded in a char, we
+		   * replicate the two most significant bits to the two least
+		   * significant ones. */
+		  *((guint32*)p) = 0x3 << 30 |
+			b << 22 | (b >> 6) << 20 |
+			g << 12 | (g >> 6) << 10 |
+			r << 2	| (r >> 6);
+
+		  p += 4;
+		}
+	  bptr += rowstride;
+	  obuf += bpl;
+	}
+}
+
 /* Generic truecolor/directcolor conversion function. Slow, but these
    are oddball modes. */
 static void
@@ -3195,6 +3237,11 @@ gdk_rgb_select_conv (GdkRgbInfo *image_info)
 #endif
     }
 #endif
+  else if (bpp == 32 && (depth == 30 || depth == 32) &&
+		   vtype == GDK_VISUAL_TRUE_COLOR &&
+		   (red_mask == 0x3ff && green_mask == 0xffc00 &&
+			blue_mask == 0x3ff00000 && byte_order == GDK_LSB_FIRST))
+	conv = gdk_rgb_convert_0AAA_br;
   else if (vtype == GDK_VISUAL_TRUE_COLOR && byte_order == GDK_LSB_FIRST)
     {
       conv = gdk_rgb_convert_truecolor_lsb;
-- 
1.7.5.4