synced with scummvm

svn-id: r4821

1 files changed, 69 insertions, 0 deletions

diff --git a/scumm/smush/color.cpp b/scumm/smush/color.cpp
new file mode 100644
index 0000000000..e88785ccbd
--- /dev/null
+++ b/scumm/smush/color.cpp
@@ -0,0 +1,69 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001/2002 The ScummVM project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+#include <stdafx.h>
+#include "color.h"
+
+Color::Color() : _r(0), _g(0), _b(0) {
+}
+
+Color::Color(value_type r, value_type g, value_type b) : _r(r), _g(g), _b(b) {
+}
+
+Color::Color(const Color & c) : _r(c._r), _g(c._g), _b(c._b) {
+}
+
+Color & Color::operator=(const Color & c) {
+	_r = c._r;
+	_g = c._g;
+	_b = c._b;
+	return *this;
+}
+
+Color::~Color() {
+}
+
+Color::value_type Color::red() const { 
+	return _r; 
+}
+
+Color::value_type Color::green() const { 
+	return _g; 
+}
+
+Color::value_type Color::blue() const { 
+	return _b;
+}
+
+void Color::delta(short * ptr) {
+	// This is a very specific method for XPALs.
+	int t;
+#define UPDATE_COLOR(c, inc) (((int)((c)) << 7) + (c) + (inc)) >> 7
+#define CHECK_BOUNDS(c) (((c) > 255) ? 255 : (((c) < 0) ? 0 : (c)))
+	t = UPDATE_COLOR(_r, ptr[0]);
+	_r = CHECK_BOUNDS(t);
+	t = UPDATE_COLOR(_g, ptr[1]);
+	_g = CHECK_BOUNDS(t);
+	t = UPDATE_COLOR(_b, ptr[2]);
+	_b = CHECK_BOUNDS(t);
+#undef UPDATE_COLOR
+#undef CHECK_BOUNDS
+}