From 708db30ba67192e37462a849efe59a437b2d8319 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Fri, 22 Feb 2013 21:32:50 -0500
Subject: Optionally list palette colors of loaded images.

---
diff --git a/configure.ac b/configure.ac
index 2ed524a..f0921fa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -58,7 +58,7 @@ AC_ARG_ENABLE([debug-tmx],
 	[])
 if test "x$enable_debug_tmx" = "xyes"; then
 	AC_DEFINE([DEBUG_TMX], [1],
-		[Define to 1 to enable debug output from TMX parser])
+		[Define to 1 to enable debug output from TMX parser.])
 fi
 
 AC_ARG_ENABLE([debug-compression],
@@ -68,7 +68,7 @@ AC_ARG_ENABLE([debug-compression],
 	[])
 if test "x$enable_debug_compression" = "xyes"; then
 	AC_DEFINE([DEBUG_COMPRESSION], [1],
-		[Define to 1 to enable debug output from tile data inflation])
+		[Define to 1 to enable debug output from tile data inflation.])
 fi
 
 AC_ARG_ENABLE([debug-render],
@@ -79,7 +79,18 @@ AC_ARG_ENABLE([debug-render],
 if test "x$enable_debug_render" = "xyes"; then
 	AC_DEFINE([DEBUG_RENDER], [1],
 		[Define to 1 to enable debug output from map layer blits and
-			area rendering])
+			area rendering.])
+fi
+
+AC_ARG_ENABLE([debug-palettes],
+	[AC_HELP_STRING([--enable-debug-palettes],
+		[enable debug output with surface palette colors listings])],
+	[enable_debug_palettes=yes],
+	[])
+if test "x$enable_debug_palettes" = "xyes"; then
+	AC_DEFINE([DEBUG_PALETTES], [1],
+		[Define to 1 to enable debug output with surface palette colors
+			listings.])
 fi
 
 AC_CONFIG_FILES([Makefile])
diff --git a/src/resources/image.c b/src/resources/image.c
index cd2c317..ae7cd30 100644
--- a/src/resources/image.c
+++ b/src/resources/image.c
@@ -1,5 +1,6 @@
 #include <SDL.h>
 #include <SDL_image.h>
+#include <config.h>
 #include "../logging.h"
 #include "image.h"
 #include "resource.h"
@@ -11,6 +12,9 @@ img_png_get(const char *path)
 {
 	SDL_RWops *rwops;
 	struct image *img;
+#ifdef DEBUG_PALETTES
+	int i;
+#endif
 
 	img = (struct image *) resource_get(&img_res, path);
 	if (img != NULL) {
@@ -26,6 +30,16 @@ img_png_get(const char *path)
 				path, IMG_GetError());
 	}
 
+#ifdef DEBUG_PALETTES
+	for (i = 0; i < img->image->format->palette->ncolors; ++i) {
+		debug("Color %3.3d: 0x%2.2x%2.2x%2.2x",
+				i,
+				img->image->format->palette->colors[i].r,
+				img->image->format->palette->colors[i].g,
+				img->image->format->palette->colors[i].b);
+	}
+#endif
+
 	resource_use((struct resource *) img);
 	resource_add(&img_res, path, (struct resource *) img);
 
--
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