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/*-*-c++-*-
* $Id$
*
* This file is part of plptools.
*
* Copyright (C) 1999-2001 Fritz Elfert <felfert@to.com>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <plp_inttypes.h>
#include "psibitmap.h"
void
encodeBitmap(int width, int height, getPixelFunction_t getPixel, bool /*rle*/,
bufferStore &out) {
bufferStore ib;
ib.addDWord(0x00000028); // hdrlen
ib.addDWord(width); // xPixels
ib.addDWord(height); // yPixels
ib.addDWord(0); // xTwips (unspecified)
ib.addDWord(0); // yTwips (unspecified)
ib.addDWord(2); // bitsPerPixel
ib.addDWord(0); // unknown1
ib.addDWord(0); // unknown2
ib.addDWord(0); // RLEflag
bufferStore rawBuf;
for (int y = 0; y < height; y++) {
int ov = 0;
int shift = 0;
int bc = 0;
for (int x = 0; x < width; x++) {
int v = getPixel(x, y) / 85;
ov |= (v << shift);
if (shift == 6) {
rawBuf.addByte(ov);
bc++;
shift = 0;
ov = 0;
} else
shift += 2;
}
if (shift != 0) {
rawBuf.addByte(ov);
shift = 0;
ov = 0;
bc++;
}
while (bc % 4) {
rawBuf.addByte(0);
bc++;
}
}
#if 1
ib.addBuff(rawBuf);
#else
//TODO: RLE encoding
int rawLen = rawBuf.getLen();
int eqCount = 1;
int lastByte = rawBuf.getByte(0);
bufferStore diBuf;
for (int i = 1; i <= rawLen; i++) {
int v;
if (i < rawLen)
v = rawBuf.getByte(i);
else
v = lastByte + 1;
if (v == lastByte) {
if (diBuf.getLen()) {
ib.addByte(0x100 - diBuf.getLen());
ib.addBuff(diBuf);
diBuf.init();
}
eqCount++;
if (eqCount > 0x7f) {
ib.addByte(0x7f);
ib.addByte(v);
eqCount = 1;
}
} else {
if (eqCount > 1) {
ib.addByte(eqCount);
ib.addByte(lastByte);
eqCount = 1;
} else {
diBuf.addByte(lastByte);
if ((diBuf.getLen() > 0x7f) || (i == rawLen)) {
ib.addByte(0x100 - diBuf.getLen());
ib.addBuff(diBuf);
diBuf.init();
}
}
}
lastByte = v;
}
#endif
out.addDWord(ib.getLen() + 4);
out.addBuff(ib);
}
#define splitByte(v) \
do { \
int j; \
\
if (x < bytesPerLine) \
for (j = 0; j < pixelsPerByte; j++) { \
if (j && ((oidx % xPixels) == 0)) \
break; \
else \
if (oidx >= picsize) \
return false; \
else { \
out.addByte((v & mask) * grayVal); \
v >>= bitsPerPixel; \
oidx++; \
} \
} \
if (++x >= linelen) \
x = 0; \
} while (0)
bool
decodeBitmap(const unsigned char *p, int &width, int &height, bufferStore &out)
{
u_int32_t totlen = *((const u_int32_t*)p); p += 4;
u_int32_t hdrlen = *((const u_int32_t*)p); p += 4;
u_int32_t datlen = totlen - hdrlen;
u_int32_t xPixels = *((const u_int32_t*)p); p += 4;
u_int32_t yPixels = *((const u_int32_t*)p); p += 4;
u_int32_t xTwips = *((const u_int32_t*)p); p += 4;
u_int32_t yTwips = *((const u_int32_t*)p); p += 4;
u_int32_t bitsPerPixel = *((const u_int32_t*)p); p += 4;
u_int32_t unknown1 = *((const u_int32_t*)p); p += 4;
u_int32_t unknown2 = *((const u_int32_t*)p); p += 4;
u_int32_t RLEflag = *((const u_int32_t*)p); p += 4;
width = xPixels;
height = yPixels;
u_int32_t picsize = xPixels * yPixels;
u_int32_t linelen;
int pixelsPerByte = (8 / bitsPerPixel);
int nColors = 1 << bitsPerPixel;
int grayVal = 255 / (nColors - 1);
int bytesPerLine = (xPixels + pixelsPerByte - 1) / pixelsPerByte;
int mask = (bitsPerPixel << 1) - 1;
int oidx = 0;
int x = 0;
int y = 0;
int offset = 0;
if (RLEflag) {
int i = 0;
while (offset < datlen) {
unsigned char b = *(p + offset);
if (b >= 0x80) {
offset += 0x100 - b + 1;
i += 0x100 - b;
} else {
offset += 2;
i += b + 1;
}
}
linelen = i / yPixels;
offset = 0;
while (offset < datlen) {
unsigned char b = *(p + offset++);
if (b >= 0x80) {
for (i = 0; i < 0x100 - b; i++, offset++) {
if (offset >= datlen)
return false; // data corrupted
unsigned char b2 = *(p + offset);
splitByte(b2);
}
} else {
if (offset >= datlen)
return false;
else {
unsigned char b2 = *(p + offset);
unsigned char bs = b2;
for (i = 0; i <= b; i++) {
splitByte(b2);
b2 = bs;
}
}
offset++;
}
}
} else {
linelen = datlen / yPixels;
while (offset < datlen) {
unsigned char b = *(p + offset++);
splitByte(b);
}
}
return true;
}
/*
* Local variables:
* c-basic-offset: 4
* End:
*/
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