BACKENDS: WII: Always retain cursor palette

Calling setMouseCursor with a non-palette cursor no longer
clears the cursor palette, allowing a subsequent call with a
paletted cursor to re-use it. This fixes Trac defect #13895.
The approach taken was to just copy what the OpenGL
backend was doing in the same situation.

backends/platform/wii/osystem_gfx.cpp

@@ -334,8 +334,13 @@ void OSystem_Wii::updateMousePalette() {
 	printf("%s() _cursorPaletteDisabled:%d\n", __func__, _cursorPaletteDisabled);
 #endif
 
-	if (_texMouse.palette && _cursorPaletteDisabled) {
-		memcpy(_texMouse.palette, _cursorPalette, 256 * 2);
+	if (_texMouse.palette) {
+		if (!_cursorPaletteDisabled) {
+			memcpy(_texMouse.palette, _cursorPalette, 256 * 2);
+		} else {
+			memcpy(_texMouse.palette, _texGame.palette, 256 * 2);
+		}
+
 		_cursorPaletteDirty = true;
 	}
 }
@@ -357,20 +362,7 @@ void OSystem_Wii::setPalette(const byte *colors, uint start, uint num) {
 
 	gfx_tex_flush_palette(&_texGame);
 
-	s = colors;
-	d = _cursorPalette;
-
-	for (uint i = 0; i < num; ++i, s += 3) {
-		d[start + i] = _pfRGB3444.ARGBToColor(0xff, s[0], s[1], s[2]);
-	}
-
-	if (_cursorPaletteDisabled) {
-		assert(_texMouse.palette);
-
-		memcpy((u8 *)_texMouse.palette + start * 2, (u8 *)_cursorPalette + start * 2, num * 2);
-
-		_cursorPaletteDirty = true;
-	}
+	updateMousePalette();
 }
 
 void OSystem_Wii::grabPalette(byte *colors, uint start, uint num) const {
@@ -407,18 +399,16 @@ void OSystem_Wii::setCursorPalette(const byte *colors, uint start, uint num) {
 		gfx_tex_set_bilinear_filter(&_texMouse, _bilinearFilter);
 	}
 
-	if (_cursorPaletteDisabled) {
-		memcpy(_cursorPalette, _texMouse.palette, 256 * 2);
-		_cursorPaletteDisabled = false;
-	}
+	_cursorPaletteDisabled = false;
 
 	const byte *s = colors;
-	u16 *d = _texMouse.palette;
+	u16 *d = _cursorPalette;
 
-	for (uint i = 0; i < num; ++i, s += 3)
+	for (uint i = 0; i < num; ++i, s += 3) {
 		d[start + i] = _pfRGB3444.ARGBToColor(0xff, s[0], s[1], s[2]);
+	}
 
-	_cursorPaletteDirty = true;
+	updateMousePalette();
 }
 
 void OSystem_Wii::copyRectToScreen(const void *buf, int pitch, int x, int y,
@@ -788,6 +778,6 @@ void OSystem_Wii::setMouseCursor(const void *buf, uint w, uint h, int hotspotX,
 	_mouseHotspotY = hotspotY;
 	_cursorDontScale = dontScale;
 
-	if ((_texMouse.palette) && (oldKeycolor != _mouseKeyColor))
-		_cursorPaletteDirty = true;
+	if (_pfCursor.bytesPerPixel == 1 && oldKeycolor != _mouseKeyColor)
+		updateMousePalette();
 }