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