mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-05 00:36:57 +00:00
103 lines
3.8 KiB
C++
103 lines
3.8 KiB
C++
/* 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.
|
|
*
|
|
*/
|
|
|
|
#ifndef GRAPHICS_PALETTE_H
|
|
#define GRAPHICS_PALETTE_H
|
|
|
|
#include "common/scummsys.h"
|
|
#include "common/noncopyable.h"
|
|
|
|
/**
|
|
* The PaletteManager is part of the OSystem backend API and responsible
|
|
* for handling the (possibly emulated) "hardware" palette needed for
|
|
* many old games (e.g. in EGA and VGA mode).
|
|
*
|
|
* By itself it is a pure abstract class, i.e. an "interface"; you can
|
|
* use the OSystem::getPaletteManager() method to obtain an instance
|
|
* that you can use to perform actual palette modifications.
|
|
*/
|
|
class PaletteManager : Common::NonCopyable {
|
|
public:
|
|
virtual ~PaletteManager() {}
|
|
|
|
/**
|
|
* Replace the specified range of the palette with new colors.
|
|
* The palette entries from 'start' till (start+num-1) will be replaced - so
|
|
* a full palette update is accomplished via start=0, num=256.
|
|
*
|
|
* The palette data is specified in interleaved RGB format. That is, the
|
|
* first byte of the memory block 'colors' points at is the red component
|
|
* of the first new color; the second byte the green component of the first
|
|
* new color; the third byte the blue component, the last byte to the alpha
|
|
* (transparency) value. Then the second color starts, and so on. So memory
|
|
* looks like this: R1-G1-B1-R2-G2-B2-R3-...
|
|
*
|
|
* @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 It is an error if start+num exceeds 256, behavior is undefined
|
|
* in that case (the backend may ignore it silently or assert).
|
|
* @note It is an error if this function gets called when the pixel format
|
|
* in use (the return value of getScreenFormat) has more than one
|
|
* byte per pixel.
|
|
*
|
|
* @see getScreenFormat
|
|
*/
|
|
virtual void setPalette(const byte *colors, uint start, uint num) = 0;
|
|
|
|
/**
|
|
* Grabs a specified part of the currently active palette.
|
|
* The format is the same as for setPalette.
|
|
*
|
|
* This should return exactly the same RGB data as was setup via previous
|
|
* setPalette calls.
|
|
*
|
|
* For example, for every valid value of start and num of the following
|
|
* code:
|
|
*
|
|
* byte origPal[num*3];
|
|
* // Setup origPal's data however you like
|
|
* g_system->setPalette(origPal, start, num);
|
|
* byte obtainedPal[num*3];
|
|
* g_system->grabPalette(obtainedPal, start, num);
|
|
*
|
|
* the following should be true:
|
|
*
|
|
* memcmp(origPal, obtainedPal, num*3) == 0
|
|
*
|
|
* @see setPalette
|
|
* @param colors the palette data, in interleaved RGB format
|
|
* @param start the first platte entry to be read
|
|
* @param num the number of palette entries to be read
|
|
*
|
|
* @note It is an error if this function gets called when the pixel format
|
|
* in use (the return value of getScreenFormat) has more than one
|
|
* byte per pixel.
|
|
*
|
|
* @see getScreenFormat
|
|
*/
|
|
virtual void grabPalette(byte *colors, uint start, uint num) = 0;
|
|
};
|
|
|
|
#endif
|