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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/endian.h"
#include "made/graphics.h"
namespace Made {
void decompressImage(byte *source, Graphics::Surface &surface, uint16 cmdOffs, uint16 pixelOffs, uint16 maskOffs, uint16 lineSize, bool deltaFrame) {
const int offsets[] = {
0, 1, 2, 3,
320, 321, 322, 323,
640, 641, 642, 643,
960, 961, 962, 963
};
uint16 width = surface.w;
uint16 height = surface.h;
byte *cmdBuffer = source + cmdOffs;
byte *maskBuffer = source + maskOffs;
byte *pixelBuffer = source + pixelOffs;
byte *destPtr = (byte*)surface.getBasePtr(0, 0);
//byte lineBuf[320 * 4];
byte lineBuf[640 * 4];
byte bitBuf[40];
int bitBufLastOfs = (((lineSize + 1) >> 1) << 1) - 2;
int bitBufLastCount = ((width + 3) >> 2) & 7;
if (bitBufLastCount == 0)
bitBufLastCount = 8;
while (height > 0) {
int drawDestOfs = 0;
memset(lineBuf, 0, sizeof(lineBuf));
memcpy(bitBuf, cmdBuffer, lineSize);
cmdBuffer += lineSize;
for (uint16 bitBufOfs = 0; bitBufOfs < lineSize; bitBufOfs += 2) {
uint16 bits = READ_LE_UINT16(&bitBuf[bitBufOfs]);
int bitCount;
if (bitBufOfs == bitBufLastOfs)
bitCount = bitBufLastCount;
else
bitCount = 8;
for (int curCmd = 0; curCmd < bitCount; curCmd++) {
int cmd = bits & 3;
bits >>= 2;
byte pixels[4];
uint32 mask;
switch (cmd) {
case 0:
pixels[0] = *pixelBuffer++;
for (int i = 0; i < 16; i++)
lineBuf[drawDestOfs + offsets[i]] = pixels[0];
break;
case 1:
pixels[0] = *pixelBuffer++;
pixels[1] = *pixelBuffer++;
mask = READ_LE_UINT16(maskBuffer);
maskBuffer += 2;
for (int i = 0; i < 16; i++) {
lineBuf[drawDestOfs + offsets[i]] = pixels[mask & 1];
mask >>= 1;
}
break;
case 2:
pixels[0] = *pixelBuffer++;
pixels[1] = *pixelBuffer++;
pixels[2] = *pixelBuffer++;
pixels[3] = *pixelBuffer++;
mask = READ_LE_UINT32(maskBuffer);
maskBuffer += 4;
for (int i = 0; i < 16; i++) {
lineBuf[drawDestOfs + offsets[i]] = pixels[mask & 3];
mask >>= 2;
}
break;
case 3:
if (!deltaFrame) {
// Yes, it reads from maskBuffer here
for (int i = 0; i < 16; i++)
lineBuf[drawDestOfs + offsets[i]] = *maskBuffer++;
}
break;
}
drawDestOfs += 4;
}
}
if (deltaFrame) {
for (int y = 0; y < 4 && height > 0; y++, height--) {
for (int x = 0; x < width; x++) {
if (lineBuf[x + y * 320] != 0)
*destPtr = lineBuf[x + y * 320];
destPtr++;
}
}
} else {
for (int y = 0; y < 4 && height > 0; y++, height--) {
memcpy(destPtr, &lineBuf[y * 320], width);
destPtr += width;
}
}
}
}
} // End of namespace Made
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