macega.h

/* 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 3 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, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef GRAPHICS_MACEGA_H
#define GRAPHICS_MACEGA_H
 
namespace Graphics {
 
// Each color has its own 2x2 dithering pattern. This array remaps them to the
// color indexes for black and white. The order of the pixels is upper left,
// upper right, lower left, lower right. I don't know if this is the standard
// method, but it does seem to be what LucasArts used so maybe it's useful for
// other games as well.
//
// One obvious candidate would be the Mac AGI games, though looking at
// screenshots makes me suspect that they used 3x2 pixels for each color.
 
const byte macEGADither[16][4] = {
    {  0,  0,  0,  0 }, // Black
    {  0,  0,  0, 15 }, // Blue
    {  0,  0, 15,  0 }, // Green
    {  0,  0, 15, 15 }, // Cyan
    {  0, 15,  0,  0 }, // Red
    {  0, 15,  0, 15 }, // Magenta
    {  0, 15, 15,  0 }, // Brown
    {  0, 15, 15, 15 }, // Light Gray
    { 15,  0,  0,  0 }, // Dark Gray
    { 15,  0,  0, 15 }, // Bright Blue
    { 15,  0, 15,  0 }, // Bright Green
    { 15,  0, 15, 15 }, // Bright Cyan
    { 15, 15,  0,  0 }, // Bright Red
    { 15, 15,  0, 15 }, // Bright Magenta
    { 15, 15, 15,  0 }, // Bright Yellow
    { 15, 15, 15, 15 }  // White
};
 
} // end of namespace Graphics
 
#endif // GRAPHICS_MACEGA_H