mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-14 21:59:17 +00:00
296 lines
6.8 KiB
C++
296 lines
6.8 KiB
C++
/* 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 {
|
|
|
|
byte ValueReader::readPixel() {
|
|
byte value;
|
|
if (_nibbleMode) {
|
|
if (_nibbleSwitch) {
|
|
value = (_buffer[0] >> 4) & 0x0F;
|
|
_buffer++;
|
|
} else {
|
|
value = _buffer[0] & 0x0F;
|
|
}
|
|
_nibbleSwitch = !_nibbleSwitch;
|
|
} else {
|
|
value = _buffer[0];
|
|
_buffer++;
|
|
}
|
|
return value;
|
|
}
|
|
|
|
uint16 ValueReader::readUint16() {
|
|
uint16 value = READ_LE_UINT16(_buffer);
|
|
_buffer += 2;
|
|
return value;
|
|
}
|
|
|
|
uint32 ValueReader::readUint32() {
|
|
uint32 value = READ_LE_UINT32(_buffer);
|
|
_buffer += 4;
|
|
return value;
|
|
}
|
|
|
|
void ValueReader::resetNibbleSwitch() {
|
|
_nibbleSwitch = false;
|
|
}
|
|
|
|
void decompressImage(byte *source, Graphics::Surface &surface, uint16 cmdOffs, uint16 pixelOffs, uint16 maskOffs, uint16 lineSize, byte cmdFlags, byte pixelFlags, byte maskFlags, 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;
|
|
ValueReader maskReader(source + maskOffs, (maskFlags & 2) != 0);
|
|
ValueReader pixelReader(source + pixelOffs, (pixelFlags & 2) != 0);
|
|
|
|
if ((maskFlags != 0) && (maskFlags != 2) && (pixelFlags != 0) && (pixelFlags != 2) && (cmdFlags != 0))
|
|
error("decompressImage() Unsupported flags: cmdFlags = %02X; maskFlags = %02X, pixelFlags = %02X", cmdFlags, maskFlags, pixelFlags);
|
|
|
|
byte *destPtr = (byte*)surface.getBasePtr(0, 0);
|
|
|
|
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] = pixelReader.readPixel();
|
|
for (int i = 0; i < 16; i++)
|
|
lineBuf[drawDestOfs + offsets[i]] = pixels[0];
|
|
break;
|
|
|
|
case 1:
|
|
pixels[0] = pixelReader.readPixel();
|
|
pixels[1] = pixelReader.readPixel();
|
|
mask = maskReader.readUint16();
|
|
for (int i = 0; i < 16; i++) {
|
|
lineBuf[drawDestOfs + offsets[i]] = pixels[mask & 1];
|
|
mask >>= 1;
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
pixels[0] = pixelReader.readPixel();
|
|
pixels[1] = pixelReader.readPixel();
|
|
pixels[2] = pixelReader.readPixel();
|
|
pixels[3] = pixelReader.readPixel();
|
|
mask = maskReader.readUint32();
|
|
for (int i = 0; i < 16; i++) {
|
|
lineBuf[drawDestOfs + offsets[i]] = pixels[mask & 3];
|
|
mask >>= 2;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
if (!deltaFrame) {
|
|
// For EGA pictures: Pixels are read starting from a new byte
|
|
maskReader.resetNibbleSwitch();
|
|
// Yes, it reads from maskReader here
|
|
for (int i = 0; i < 16; i++)
|
|
lineBuf[drawDestOfs + offsets[i]] = maskReader.readPixel();
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
void decompressMovieImage(byte *source, Graphics::Surface &surface, uint16 cmdOffs, uint16 pixelOffs, uint16 maskOffs, uint16 lineSize) {
|
|
|
|
uint16 width = surface.w;
|
|
uint16 height = surface.h;
|
|
uint16 bx = 0, by = 0, bw = ((width + 3) / 4) * 4;
|
|
|
|
byte *cmdBuffer = source + cmdOffs;
|
|
byte *maskBuffer = source + maskOffs;
|
|
byte *pixelBuffer = source + pixelOffs;
|
|
|
|
byte *destPtr = (byte*)surface.getBasePtr(0, 0);
|
|
|
|
byte bitBuf[40];
|
|
|
|
int bitBufLastOfs = (((lineSize + 1) >> 1) << 1) - 2;
|
|
int bitBufLastCount = ((width + 3) >> 2) & 7;
|
|
if (bitBufLastCount == 0)
|
|
bitBufLastCount = 8;
|
|
|
|
debug(1, "width = %d; bw = %d", width, bw);
|
|
|
|
while (height > 0) {
|
|
|
|
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++) {
|
|
uint cmd = bits & 3;
|
|
bits >>= 2;
|
|
|
|
byte pixels[4], block[16];
|
|
uint32 mask;
|
|
|
|
switch (cmd) {
|
|
|
|
case 0:
|
|
pixels[0] = *pixelBuffer++;
|
|
for (int i = 0; i < 16; i++)
|
|
block[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++) {
|
|
block[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++) {
|
|
block[i] = pixels[mask & 3];
|
|
mask >>= 2;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
break;
|
|
|
|
}
|
|
|
|
if (cmd != 3) {
|
|
uint16 blockPos = 0;
|
|
uint32 maxW = MIN(4, surface.w - bx);
|
|
uint32 maxH = (MIN(4, surface.h - by) + by) * width;
|
|
for (uint32 yc = by * width; yc < maxH; yc += width) {
|
|
for (uint32 xc = 0; xc < maxW; xc++) {
|
|
destPtr[(bx + xc) + yc] = block[xc + blockPos];
|
|
}
|
|
blockPos += 4;
|
|
}
|
|
}
|
|
|
|
bx += 4;
|
|
if (bx >= bw) {
|
|
bx = 0;
|
|
by += 4;
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
height -= 4;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} // End of namespace Made
|