From a5269a0d00bdbc7061b28a4853d5e02a8143fa08 Mon Sep 17 00:00:00 2001
From: Sven Neumann <sven@gimp.org>
Date: Thu, 27 May 2004 15:23:56 +0000
Subject: [PATCH] handle an empty colormap. Fixes bug #143009.

2004-05-27  Sven Neumann  <sven@gimp.org>

	* plug-ins/common/png.c (respin_cmap): handle an empty colormap.
	Fixes bug #143009.
---
 ChangeLog             |  5 +++++
 plug-ins/common/png.c | 22 ++++++++++++++++------
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b92776b60a..610b192114 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2004-05-27  Sven Neumann  <sven@gimp.org>
+
+	* plug-ins/common/png.c (respin_cmap): handle an empty colormap.
+	Fixes bug #143009.
+
 2004-05-27  Sven Neumann  <sven@gimp.org>
 
 	* libgimpwidgets/gimppickbutton.c: applied patch from Philip
diff --git a/plug-ins/common/png.c b/plug-ins/common/png.c
index a79785d506..29156f1d2e 100644
--- a/plug-ins/common/png.c
+++ b/plug-ins/common/png.c
@@ -1471,15 +1471,25 @@ respin_cmap (png_structp pp,
              GimpDrawable * drawable)
 {
   static const guchar trans[] = { 0 };
-  gint colors;
-  guchar *before;
-  gint transparent;
-  gint cols, rows;
-  GimpPixelRgn pixel_rgn;
-  guchar *pixels;
+
+  gint          colors;
+  guchar       *before;
+  gint          transparent;
+  gint          cols, rows;
+  GimpPixelRgn  pixel_rgn;
+  guchar       *pixels;
 
   before = gimp_image_get_cmap (image_ID, &colors);
 
+  /*
+   * Make sure there is something in the colormap.
+   */
+  if (colors == 0)
+    {
+      before = g_new0 (guchar, 3);
+      colors = 1;
+    }
+
   cols = drawable->width;
   rows = drawable->height;