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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 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.
*
* $URL$
* $Id$
*
*/
#include "common/rect.h"
#include "m4/globals.h"
#include "m4/graphics.h"
#include "m4/m4.h"
#include "m4/resource.h"
#include "m4/sprite.h"
namespace M4 {
enum {
kEndOfLine = 0,
kEndOfSprite = 1,
kMarker = 2
};
M4Sprite::M4Sprite(Common::SeekableReadStream* source, int xOfs, int yOfs, int widthVal, int heightVal, bool decodeRle, uint8 encodingVal)
: M4Surface(widthVal, heightVal), encoding(encodingVal) {
if (_vm->isM4()) {
if (decodeRle) {
loadRle(source);
} else {
// Raw sprite data, load directly
byte *dst = getData();
source->read(dst, widthVal * heightVal);
}
} else {
loadMadsSprite(source);
}
xOffset = xOfs;
yOffset = yOfs;
}
void M4Sprite::loadRle(Common::SeekableReadStream* rleData) {
byte *dst = getData();
while (1) {
byte len = rleData->readByte();
if (len == 0) {
len = rleData->readByte();
if (len <= kMarker) {
if (len == kEndOfSprite)
break;
} else {
while (len--) {
*dst++ = rleData->readByte();
}
}
} else {
byte value = rleData->readByte();
while (len--)
*dst++ = value;
}
}
}
void M4Sprite::loadDeltaRle(Common::SeekableReadStream* rleData, int destX, int destY) {
int lineNum = 0;
byte *dst = getBasePtr(destX, destY);
while (1) {
byte len = rleData->readByte();
if (len == 0) {
len = rleData->readByte();
if (len <= kMarker) {
if (len == kEndOfLine) {
dst = getBasePtr(destX, destY + lineNum);
lineNum++;
} else if (len == kEndOfSprite)
break;
} else {
while (len--) {
byte pixel = rleData->readByte();
if (pixel == 0)
dst++;
else
*dst++ = pixel;
/* NOTE: The change below behaved differently than the old code,
so I put the old code back in again above.
If the pixel value is 0, nothing should be written to the
output buffer, since 0 means transparent. */
//*dst++ = (pixel == 0xFD) ? 0 : pixel;
}
}
} else {
byte value = rleData->readByte();
if (value == 0)
dst += len;
else
while (len--)
*dst++ = value;
}
}
}
// TODO: The sprite outlines (pixel value 0xFD) are not shown
void M4Sprite::loadMadsSprite(Common::SeekableReadStream* source) {
byte *outp, *lineStart;
bool newLine = false;
outp = getData();
lineStart = getData();
while (1) {
byte cmd1, cmd2, count, pixel;
if (newLine) {
outp = lineStart + w;
lineStart = outp;
newLine = false;
}
cmd1 = source->readByte();
if (cmd1 == 0xFC)
break;
else if (cmd1 == 0xFF)
newLine = true;
else if (cmd1 == 0xFD) {
while (!newLine) {
count = source->readByte();
if (count == 0xFF) {
newLine = true;
} else {
pixel = source->readByte();
while (count--)
*outp++ = (pixel == 0xFD) ? 0 : pixel;
}
}
} else {
while (!newLine) {
cmd2 = source->readByte();
if (cmd2 == 0xFF) {
newLine = true;
} else if (cmd2 == 0xFE) {
count = source->readByte();
pixel = source->readByte();
while (count--)
*outp++ = (pixel == 0xFD) ? 0 : pixel;
} else {
*outp++ = (cmd2 == 0xFD) ? 0 : cmd2;
}
}
}
}
}
} // End of namespace M4
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