mirror of
https://github.com/kasmtech/KasmVNC.git
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129 lines
3.1 KiB
C++
129 lines
3.1 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#define CONCAT2(a,b) a##b
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#define CONCAT2E(a,b) CONCAT2(a,b)
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#define UBPP CONCAT2E(U,BPP)
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void ZRLEEncoder::writePaletteTile(int width, int height,
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const rdr::UBPP* buffer, int stride,
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const PixelFormat& pf,
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const Palette& palette)
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{
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const int bitsPerPackedPixel[] = {
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0, 1, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
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};
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int bppp;
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int pad;
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assert(palette.size() > 1);
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assert(palette.size() <= 16);
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zos.writeU8(palette.size());
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writePalette(pf, palette);
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bppp = bitsPerPackedPixel[palette.size()-1];
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pad = stride - width;
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for (int i = 0; i < height; i++) {
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int w;
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rdr::U8 nbits = 0;
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rdr::U8 byte = 0;
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w = width;
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while (w--) {
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rdr::UBPP pix = *buffer++;
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rdr::U8 index = palette.lookup(pix);
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byte = (byte << bppp) | index;
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nbits += bppp;
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if (nbits >= 8) {
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zos.writeU8(byte);
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nbits = 0;
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}
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}
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if (nbits > 0) {
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byte <<= 8 - nbits;
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zos.writeU8(byte);
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}
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buffer += pad;
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}
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}
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void ZRLEEncoder::writePaletteRLETile(int width, int height,
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const rdr::UBPP* buffer, int stride,
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const PixelFormat& pf,
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const Palette& palette)
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{
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int pad;
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rdr::UBPP prevColour;
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int runLength;
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assert(palette.size() > 1);
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assert(palette.size() <= 127);
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zos.writeU8(palette.size() | 0x80);
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writePalette(pf, palette);
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pad = stride - width;
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prevColour = *buffer;
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runLength = 0;
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while (height--) {
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int w = width;
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while (w--) {
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if (prevColour != *buffer) {
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if (runLength == 1)
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zos.writeU8(palette.lookup(prevColour));
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else {
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zos.writeU8(palette.lookup(prevColour) | 0x80);
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while (runLength > 255) {
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zos.writeU8(255);
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runLength -= 255;
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}
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zos.writeU8(runLength - 1);
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}
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prevColour = *buffer;
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runLength = 0;
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}
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runLength++;
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buffer++;
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}
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buffer += pad;
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}
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if (runLength == 1)
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zos.writeU8(palette.lookup(prevColour));
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else {
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zos.writeU8(palette.lookup(prevColour) | 0x80);
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while (runLength > 255) {
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zos.writeU8(255);
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runLength -= 255;
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}
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zos.writeU8(runLength - 1);
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}
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}
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