103 lines
2.4 KiB
C++
103 lines
2.4 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 "common/file.h"
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#include "common/system.h"
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#include "graphics/screen.h"
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#include "mm/mm1/gfx/gfx.h"
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#include "mm/mm1/gfx/screen_decoder.h"
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namespace MM {
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namespace MM1 {
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namespace Gfx {
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#define IMAGE_SIZE 16000
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ScreenDecoder::~ScreenDecoder() {
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destroy();
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}
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void ScreenDecoder::destroy() {
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_surface.free();
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}
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bool ScreenDecoder::loadFile(const Common::Path &fname,
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int16 w, int16 h) {
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Common::File f;
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if (!f.open(fname))
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return false;
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f.skip(2); // Skip size word
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return loadStream(f, w, h);
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}
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bool ScreenDecoder::loadStream(Common::SeekableReadStream &stream,
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int16 w, int16 h) {
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byte bytes[IMAGE_SIZE];
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byte v;
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int len;
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const byte *srcP;
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byte *destP = &bytes[0];
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int index = 0;
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int imgSize = w * h / 4;
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// Decompress the image bytes
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int x = 0;
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while (x < (w / 4) && !stream.eos()) {
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v = stream.readByte();
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if (v != 0x7B) {
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len = 1;
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} else {
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len = stream.readByte() + 1;
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v = stream.readByte();
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}
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for (; len > 0; --len) {
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destP[index] = v;
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index += (w / 4);
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if (index >= imgSize) {
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index = 0;
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++destP;
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++x;
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}
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}
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}
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// Create surface from splitting up the pairs of bits
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_surface.free();
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_surface.create(w, h, Graphics::PixelFormat::createFormatCLUT8());
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srcP = &bytes[0];
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destP = (byte *)_surface.getPixels();
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for (int i = 0; i < w * h / 4; ++i, ++srcP) {
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v = *srcP;
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for (int j = 0; j < 4; ++j, v <<= 2)
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*destP++ = EGA_INDEXES[_indexes[v >> 6]];
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}
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return true;
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}
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} // namespace Gfx
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} // End of namespace Xeen
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} // End of namespace MM
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