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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 = getBasePtr();
source->read(dst, widthVal * heightVal);
}
} else {
loadMadsSprite(source);
}
x = xOffset = xOfs;
y = yOffset = yOfs;
}
void M4Sprite::loadRle(Common::SeekableReadStream* rleData) {
byte *dst = getBasePtr();
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) {
bool spriteEnd = false;
// Set entire sprite contents to transparent pixels
fillRect(bounds(), TRANSPARENT_COLOUR_INDEX);
// Major line loop
for (int yp = 0; yp < h; ++yp) {
byte *destP = getBasePtr(0, yp);
bool newLine = false;
byte cmd = source->readByte();
int x2 = 0;
if (cmd == 0xfc) {
// End of entire sprite
spriteEnd = true;
break;
} else if (cmd == 0xff) {
// The entire line is empty
newLine = true;
} else if (cmd == 0xFD) {
// Lines contains only run lenghs of pixels
while (x2 < w) {
cmd = source->readByte();
if (cmd == 0xff) {
// End of line reached
newLine = true;
break;
}
byte v = source->readByte();
while (cmd-- > 0) {
if (x2 < w)
*destP++ = (v == 0xFD) ? TRANSPARENT_COLOUR_INDEX : v;
++x2;
}
}
} else {
// Line intermixes run lengths with individual pixels
while (x2 < w) {
cmd = source->readByte();
if (cmd == 0xff) {
// End of line reached
newLine = true;
break;
}
if (cmd == 0xFE) {
// Handle repeated sequence
cmd = source->readByte();
byte v = source->readByte();
while (cmd-- > 0) {
if (x2 < w) {
*destP++ = (v == 0xFD) ? TRANSPARENT_COLOUR_INDEX : v;
}
++x2;
}
} else {
// Handle writing out single pixel
*destP++ = (cmd == 0xFD) ? TRANSPARENT_COLOUR_INDEX : cmd;
++x2;
}
}
}
// Check if we need to scan forward to find the end of the line
if (!newLine) {
do {
if (source->eos()) {
warning("M4Sprite::loadMadsSprite: unexpected end of data");
break;
}
} while (source->readByte() != 0xff);
}
}
if (!spriteEnd) {
byte v = source->readByte();
assert(v == 0xFC);
}
}
byte M4Sprite::getTransparencyIndex() const {
return TRANSPARENT_COLOUR_INDEX;
}
} // End of namespace M4
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