# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1559652970 -10800
# Node ID 1c111bfc17d4ad9660ecb3003874b38bf62ba9ef
# Parent  7652b3fe8f309ba641195bcb30e0d87fa6854ecc
Add check to PNG and PPM output as well.

diff -r 7652b3fe8f30 -r 1c111bfc17d4 tools/libgfx.c
--- a/tools/libgfx.c	Tue Jun 04 15:44:49 2019 +0300
+++ b/tools/libgfx.c	Tue Jun 04 15:56:10 2019 +0300
@@ -770,6 +770,14 @@
     DMImageConvSpec tmpSpec;
     char *tmpFmt;
 
+    // Check if we can do this
+    if ((spec->format == DM_COLFMT_PALETTE || spec->format == DM_COLFMT_GRAYSCALE) &&
+        img->format != spec->format)
+    {
+        return dmError(DMERR_NOT_SUPPORTED,
+            "Conversion of non-indexed image to indexed not supported yet.\n");
+    }
+
     memcpy(&tmpSpec, spec, sizeof(DMImageConvSpec));
 
     switch (spec->format)
@@ -972,6 +980,14 @@
     png_infop info_ptr = NULL;
     int fmt, res;
 
+    // Check if we can do this
+    if ((spec->format == DM_COLFMT_PALETTE || spec->format == DM_COLFMT_GRAYSCALE) &&
+        img->format != spec->format)
+    {
+        return dmError(DMERR_NOT_SUPPORTED,
+            "Conversion of non-indexed image to indexed not supported yet.\n");
+    }
+
     // Create PNG structures
     png_ptr = png_create_write_struct(
         PNG_LIBPNG_VER_STRING,