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Diffstat (limited to 'backends/graphics/default-palette.h')
-rw-r--r-- | backends/graphics/default-palette.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/backends/graphics/default-palette.h b/backends/graphics/default-palette.h new file mode 100644 index 0000000000..6e3a75350e --- /dev/null +++ b/backends/graphics/default-palette.h @@ -0,0 +1,63 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * 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 BACKENDS_GRAPHICS_DEFAULT_PALETTE_H +#define BACKENDS_GRAPHICS_DEFAULT_PALETTE_H + +#include "graphics/palette.h" + +/** + * This is a default implementation of the PaletteManager interface + * which ensures that grabPalette works as specified. Of course + * it is still necessary to provide code that actually updates + * the (possibly emulated) "hardware" palette of the backend. + * For this purpose, implement the abstract setPaletteIntern + * method. + */ +class DefaultPaletteManager : public PaletteManager { +protected: + byte _palette[4 * 256]; + + /** + * Subclasses should only implement this method and none of the others. + * Its semantics are like that of setPalette, only that it does not need + * to worry about making it possible to query the palette values once they + * have been set. + */ + virtual void setPaletteIntern(const byte *colors, uint start, uint num) = 0; + +public: + void setPalette(const byte *colors, uint start, uint num) { + assert(start + num <= 256); + memcpy(_palette + 4 * start, colors, 4 * num); + setPaletteIntern(colors, start, num); + } + void grabPalette(byte *colors, uint start, uint num) { + assert(start + num <= 256); + memcpy(colors, _palette + 4 * start, 4 * num); + } +}; + +#endif |