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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#define CONCAT2(a,b) a##b
#define CONCAT2E(a,b) CONCAT2(a,b)
#define UBPP CONCAT2E(U,BPP)
void ZRLEEncoder::writePaletteTile(int width, int height,
const rdr::UBPP* buffer, int stride,
const PixelFormat& pf,
const Palette& palette)
{
const int bitsPerPackedPixel[] = {
0, 1, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
};
int bppp;
int pad;
assert(palette.size() > 1);
assert(palette.size() <= 16);
zos.writeU8(palette.size());
writePalette(pf, palette);
bppp = bitsPerPackedPixel[palette.size()-1];
pad = stride - width;
for (int i = 0; i < height; i++) {
int w;
rdr::U8 nbits = 0;
rdr::U8 byte = 0;
w = width;
while (w--) {
rdr::UBPP pix = *buffer++;
rdr::U8 index = palette.lookup(pix);
byte = (byte << bppp) | index;
nbits += bppp;
if (nbits >= 8) {
zos.writeU8(byte);
nbits = 0;
}
}
if (nbits > 0) {
byte <<= 8 - nbits;
zos.writeU8(byte);
}
buffer += pad;
}
}
void ZRLEEncoder::writePaletteRLETile(int width, int height,
const rdr::UBPP* buffer, int stride,
const PixelFormat& pf,
const Palette& palette)
{
int pad;
rdr::UBPP prevColour;
int runLength;
assert(palette.size() > 1);
assert(palette.size() <= 127);
zos.writeU8(palette.size() | 0x80);
writePalette(pf, palette);
pad = stride - width;
prevColour = *buffer;
runLength = 0;
while (height--) {
int w = width;
while (w--) {
if (prevColour != *buffer) {
if (runLength == 1)
zos.writeU8(palette.lookup(prevColour));
else {
zos.writeU8(palette.lookup(prevColour) | 0x80);
while (runLength > 255) {
zos.writeU8(255);
runLength -= 255;
}
zos.writeU8(runLength - 1);
}
prevColour = *buffer;
runLength = 0;
}
runLength++;
buffer++;
}
buffer += pad;
}
if (runLength == 1)
zos.writeU8(palette.lookup(prevColour));
else {
zos.writeU8(palette.lookup(prevColour) | 0x80);
while (runLength > 255) {
zos.writeU8(255);
runLength -= 255;
}
zos.writeU8(runLength - 1);
}
}
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