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/* Copyright (C) 2000-2003 Constantin Kaplinsky. All Rights Reserved.
* Copyright (C) 2011 D. R. Commander. All Rights Reserved.
* Copyright 2014 Pierre Ossman for Cendio AB
*
* 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 TightEncoder::writeMonoRect(int width, int height,
const rdr::UBPP* buffer, int stride,
const PixelFormat& pf,
const Palette& palette)
{
rdr::OutStream* os;
const int streamId = 1;
rdr::UBPP pal[2];
int length;
rdr::OutStream* zos;
assert(palette.size() == 2);
os = conn->getOutStream();
os->writeU8((streamId | tightExplicitFilter) << 4);
os->writeU8(tightFilterPalette);
// Write the palette
pal[0] = (rdr::UBPP)palette.getColour(0);
pal[1] = (rdr::UBPP)palette.getColour(1);
os->writeU8(1);
writePixels((rdr::U8*)pal, pf, 2, os);
// Set up compression
length = (width + 7)/8 * height;
zos = getZlibOutStream(streamId, monoZlibLevel, length);
// Encode the data
rdr::UBPP bg;
unsigned int value, mask;
int pad, aligned_width;
int x, y, bg_bits;
bg = pal[0];
aligned_width = width - width % 8;
pad = stride - width;
for (y = 0; y < height; y++) {
for (x = 0; x < aligned_width; x += 8) {
for (bg_bits = 0; bg_bits < 8; bg_bits++) {
if (*buffer++ != bg)
break;
}
if (bg_bits == 8) {
zos->writeU8(0);
continue;
}
mask = 0x80 >> bg_bits;
value = mask;
for (bg_bits++; bg_bits < 8; bg_bits++) {
mask >>= 1;
if (*buffer++ != bg) {
value |= mask;
}
}
zos->writeU8(value);
}
if (x < width) {
mask = 0x80;
value = 0;
for (; x < width; x++) {
if (*buffer++ != bg) {
value |= mask;
}
mask >>= 1;
}
zos->writeU8(value);
}
buffer += pad;
}
// Finish the zlib stream
flushZlibOutStream(zos);
}
#if (BPP != 8)
void TightEncoder::writeIndexedRect(int width, int height,
const rdr::UBPP* buffer, int stride,
const PixelFormat& pf,
const Palette& palette)
{
rdr::OutStream* os;
const int streamId = 2;
rdr::UBPP pal[256];
rdr::OutStream* zos;
int pad;
rdr::UBPP prevColour;
unsigned char idx;
assert(palette.size() > 0);
assert(palette.size() <= 256);
os = conn->getOutStream();
os->writeU8((streamId | tightExplicitFilter) << 4);
os->writeU8(tightFilterPalette);
// Write the palette
for (int i = 0; i < palette.size(); i++)
pal[i] = (rdr::UBPP)palette.getColour(i);
os->writeU8(palette.size() - 1);
writePixels((rdr::U8*)pal, pf, palette.size(), os);
// Set up compression
zos = getZlibOutStream(streamId, idxZlibLevel, width * height);
// Encode the data
pad = stride - width;
prevColour = *buffer;
idx = palette.lookup(*buffer);
while (height--) {
int w = width;
while (w--) {
if (*buffer != prevColour) {
prevColour = *buffer;
idx = palette.lookup(*buffer);
}
zos->writeU8(idx);
buffer++;
}
buffer += pad;
}
// Finish the zlib stream
flushZlibOutStream(zos);
}
#endif // #if (BPP != 8)
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