Do not call OSystem::grabPalette() for 16bit modes, when the result is not used anyway for those modes.

svn-id: r48733

1 files changed, 9 insertions, 3 deletions

diff --git a/graphics/scaler/thumbnail_intern.cpp b/graphics/scaler/thumbnail_intern.cpp
index 66b275fcb2..9a3665abaa 100644
--- a/graphics/scaler/thumbnail_intern.cpp
+++ b/graphics/scaler/thumbnail_intern.cpp
@@ -102,12 +102,16 @@ static bool grabScreen565(Graphics::Surface *surf) {
 	assert(screen->bytesPerPixel == 1 || screen->bytesPerPixel == 2);
 	assert(screen->pixels != 0);
 
-	byte palette[256 * 4];
-	g_system->grabPalette(&palette[0], 0, 256);
+	Graphics::PixelFormat screenFormat = g_system->getScreenFormat();
 
 	surf->create(screen->w, screen->h, 2);
 
-	Graphics::PixelFormat screenFormat = g_system->getScreenFormat();
+	byte *palette = 0;
+	if (screenFormat.bytesPerPixel == 1) {
+		palette = new byte[256 * 4];
+		assert(palette);
+		g_system->grabPalette(&palette[0], 0, 256);
+	}
 
 	for (uint y = 0; y < screen->h; ++y) {
 		for (uint x = 0; x < screen->w; ++x) {
@@ -126,6 +130,8 @@ static bool grabScreen565(Graphics::Surface *surf) {
 		}
 	}
 
+	delete[] palette;
+
 	g_system->unlockScreen();
 	return true;
 }