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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/algorithm.h"
#include "common/textconsole.h"
#include "m4/platform/draw.h"
namespace M4 {
void RLE8Decode(const uint8 *inBuff, uint8 *outBuff, uint32 pitch) {
byte val, count;
int line = 0, numY = 0;
byte *destP = outBuff;
for (;;) {
count = *inBuff++;
if (count) {
// Basic run length
val = *inBuff++;
Common::fill(destP, destP + count, val);
destP += count;
} else {
count = *inBuff++;
if (count >= 3) {
// Block of uncompressed pixels to copy
Common::copy(inBuff, inBuff + count, destP);
inBuff += count;
destP += count;
} else if (!(count & 3)) {
// End of Line code
++line;
destP = outBuff + line * pitch;
} else if (!(count & 2)) {
break;
} else {
// Move down by X, Y amount
destP += *inBuff++; // x amount
numY = *inBuff++; // y amount
line += numY;
destP += numY * pitch;
}
}
}
}
uint8 *SkipRLE_Lines(uint32 linesToSkip, uint8 *rleData) {
while (linesToSkip > 0) {
if (*rleData) {
// Simple RLE sequence, so skip over count and value
rleData += 2;
} else if (rleData[1] >= 3) {
rleData += 2 + rleData[2];
} else {
rleData += 2;
--linesToSkip;
}
}
return rleData;
}
size_t RLE8Decode_Size(byte *src, int pitch) {
size_t total = 0, line = 0, y;
byte count;
for (;;) {
count = *src++;
if (count) {
total += count;
++src;
} else {
count = *src++;
if (count >= 3) {
// Block of uncompressed pixels to copy
total += count;
src += count;
} else if (!(count & 3)) {
// End of Line code
++line;
total = line * pitch;
} else if (!(count & 2)) {
break;
} else {
// Move down by X, Y amount
total += *src++; // x amount
y = *src++; // y amount
line += y;
total += y * pitch;
}
}
}
return total;
}
void RLE_Draw(Buffer *src, Buffer *dest, int32 x, int32 y) {
const byte *srcP = src->data;
byte *destData = dest->data + y * dest->w + x;
byte *destP = destData;
int destWidth = dest->w;
byte count, val;
int line = 0;
assert(x >= 0 && y >= 0 && x < dest->w && y < dest->h);
for (;;) {
count = *srcP++;
if (count) {
// Basic run length
val = *srcP++;
// 0 pixels are transparent, and are skipped. Otherwise, draw pixels
if (val != 0)
Common::fill(destP, destP + count, val);
destP += count;
} else {
count = *srcP++;
if (count >= 3) {
// Block of uncompressed pixels to copy
for (; count > 0; --count, ++destP) {
val = *srcP++;
if (val != 0)
*destP = val;
}
} else if (!(count & 3)) {
// End of line code
++line;
destP = destData + line * destWidth;
} else {
// Stop drawing image. Seems weird that it doesn't handle the X/Y offset
// form for count & 2, but the original explicitly doesn't implement it
break;
}
}
}
assert(destP <= (dest->data + dest->h * dest->stride));
}
} // namespace M4
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