114 lines
2.8 KiB
C++
114 lines
2.8 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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#include "ultima/nuvie/core/nuvie_defs.h"
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#include "ultima/nuvie/files/nuvie_io_file.h"
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#include "ultima/nuvie/misc/u6_misc.h"
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#include "ultima/nuvie/conf/configuration.h"
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#include "ultima/nuvie/screen/dither.h"
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namespace Ultima {
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namespace Nuvie {
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//dither EGA to CGA
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static const uint8 dither_cga_tbl[0x10] = {0, 3, 3, 3, 13, 13, 13, 3, 3, 13, 15, 3, 13, 13, 15, 15};
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//static const uint8 dither_cga_tbl[0x10] = {0,1,1,1,2 ,2 ,2 ,1,1,2 ,3 ,1,2 ,2 ,3, 3};
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Dither::Dither(const Configuration *cfg) : config(cfg), dither(nullptr), mode(DITHER_NONE) {
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set_mode();
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if (mode != DITHER_NONE)
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load_data();
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}
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Dither::~Dither() {
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if (dither)
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free(dither);
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}
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bool Dither::load_data() {
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Common::Path path;
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NuvieIOFileRead file;
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config_get_path(config, "dither", path);
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if (file.open(path) == false)
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return false;//fixme better error handling
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dither = (uint8 *)malloc(0x200);
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if (dither == nullptr)
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return false;
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file.readToBuf(dither, 0x200);
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file.close();
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return true;
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}
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void Dither::set_mode() {
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Std::string str_dither_mode;
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config->value("config/general/dither_mode", str_dither_mode);
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if (str_dither_mode == "none")
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mode = DITHER_NONE;
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else if (str_dither_mode == "cga") {
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mode = DITHER_CGA;
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} else if (str_dither_mode == "ega") {
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mode = DITHER_EGA;
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} else
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mode = DITHER_NONE;
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return;
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}
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bool Dither::dither_bitmap(unsigned char *src_buf, uint16 src_w, uint16 src_h, bool has_transparency) {
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if (!dither || mode == DITHER_NONE)
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return false;
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for (int y = 0; y < src_h; y++) {
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for (int x = 0; x < src_w; x++) {
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uint8 pixel = src_buf[y * src_w + x];
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if (has_transparency && pixel == 0xff)
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continue;
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if (pixel >= 0xe0 && pixel != 0xff)
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pixel &= 0xf;
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if (((x & 1) ^ (y & 1)) == 0)
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pixel = dither[0x100 + pixel];
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else
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pixel = dither[pixel];
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if (mode == DITHER_CGA)
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pixel = dither_cga_tbl[pixel];
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src_buf[y * src_w + x] = pixel;
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}
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}
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return true;
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}
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} // End of namespace Nuvie
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} // End of namespace Ultima
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