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60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef BACKENDS_GRAPHICS_DEFAULT_PALETTE_H
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#define BACKENDS_GRAPHICS_DEFAULT_PALETTE_H
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#include "graphics/palette.h"
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/**
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* This is a default implementation of the PaletteManager interface
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* which ensures that grabPalette works as specified. Of course
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* it is still necessary to provide code that actually updates
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* the (possibly emulated) "hardware" palette of the backend.
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* For this purpose, implement the abstract setPaletteIntern
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* method.
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*/
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class DefaultPaletteManager : public PaletteManager {
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protected:
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byte _palette[3 * 256];
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/**
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* Subclasses should only implement this method and none of the others.
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* Its semantics are like that of setPalette, only that it does not need
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* to worry about making it possible to query the palette values once they
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* have been set.
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*/
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virtual void setPaletteIntern(const byte *colors, uint start, uint num) = 0;
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public:
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void setPalette(const byte *colors, uint start, uint num) {
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assert(start + num <= 256);
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memcpy(_palette + 3 * start, colors, 3 * num);
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setPaletteIntern(colors, start, num);
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}
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void grabPalette(byte *colors, uint start, uint num) const {
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assert(start + num <= 256);
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memcpy(colors, _palette + 3 * start, 3 * num);
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}
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};
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#endif
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