123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165 |
- /* 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)
|