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/* ScummVM - Scumm Interpreter
* Copyright (C) 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*/
#ifndef GRAPHICS_PALETTEMAN_H
#define GRAPHICS_PALETTEMAN_H
#include "common/stdafx.h"
#include "common/scummsys.h"
#include "common/stack.h"
#include "common/singleton.h"
namespace Graphics {
class PaletteManager : public Common::Singleton<PaletteManager> {
public:
/**
* Push a new cursor palette onto the stack, and set it in the backend.
* The palette entries from 'start' till (start+num-1) will be replaced
* so a full palette updated is accomplished via start=0, num=256.
*
* The palette data is specified in the same interleaved RGBA format as
* used by all backends.
*
* @param colors the new palette data, in interleaved RGB format
* @param start the first palette entry to be updated
* @param num the number of palette entries to be updated
*
* @note If num is zero, the cursor palette is disabled.
*/
void pushCursorPalette(const byte *colors, uint start, uint num);
/**
* Pop a cursor palette from the stack, and restore the previous one to
* the backend. If there is no previous palette, the cursor palette is
* disabled instead.
*/
void popCursorPalette();
/**
* Replace the current cursor palette on the stack. If the stack is
* empty, the palette is pushed instead. It's a slightly more optimized
* way of popping the old palette before pushing the new one.
*
* @param colors the new palette data, in interleaved RGB format
* @param start the first palette entry to be updated
* @param num the number of palette entries to be updated
*
* @note If num is zero, the cursor palette is disabled.
*/
void replaceCursorPalette(const byte *colors, uint start, uint num);
private:
friend class Common::Singleton<SingletonBaseType>;
PaletteManager();
struct Palette {
byte *_data;
uint _start;
uint _num;
uint _size;
Palette(const byte *colors, uint start, uint num) {
_start = start;
_num = num;
_size = 4 * num;
if (num) {
_data = new byte[_size];
memcpy(_data, colors, _size);
} else {
_data = NULL;
}
}
~Palette() {
delete [] _data;
}
};
Common::Stack<Palette *> _cursorPaletteStack;
};
} // End of namespace Graphics
/** Shortcut for accessing the palette manager. */
#define PaletteMan (Graphics::PaletteManager::instance())
#endif
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