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![Peter Åstrand](/assets/img/avatar_default.png)
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@20 3789f03b-4d11-0410-bbf8-ca57d06f2519
147 lines
4.3 KiB
C++
147 lines
4.3 KiB
C++
/* Copyright (C) 2000-2003 Constantin Kaplinsky. 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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#include <rfb/CMsgReader.h>
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#include <rfb/CMsgHandler.h>
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#include <rfb/TightDecoder.h>
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#include <stdio.h> /* jpeglib.h needs FILE */
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#include <jpeglib.h>
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using namespace rfb;
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#define RGB24_TO_PIXEL(bpp,r,g,b) \
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((((PIXEL_T)(r) & 0xFF) * myFormat.redMax + 127) / 255 \
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<< myFormat.redShift | \
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(((PIXEL_T)(g) & 0xFF) * myFormat.greenMax + 127) / 255 \
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<< myFormat.greenShift | \
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(((PIXEL_T)(b) & 0xFF) * myFormat.blueMax + 127) / 255 \
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<< myFormat.blueShift)
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#define TIGHT_MAX_WIDTH 2048
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static void JpegSetSrcManager(j_decompress_ptr cinfo, char *compressedData,
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int compressedLen);
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static bool jpegError;
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#define EXTRA_ARGS CMsgHandler* handler
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#define FILL_RECT(r, p) handler->fillRect(r, p)
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#define IMAGE_RECT(r, p) handler->imageRect(r, p)
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#define BPP 8
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#include <rfb/tightDecode.h>
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#undef BPP
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#define BPP 16
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#include <rfb/tightDecode.h>
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#undef BPP
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#define BPP 32
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#include <rfb/tightDecode.h>
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#undef BPP
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Decoder* TightDecoder::create(CMsgReader* reader)
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{
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return new TightDecoder(reader);
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}
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TightDecoder::TightDecoder(CMsgReader* reader_) : reader(reader_)
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{
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}
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TightDecoder::~TightDecoder()
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{
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}
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void TightDecoder::readRect(const Rect& r, CMsgHandler* handler)
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{
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rdr::InStream* is = reader->getInStream();
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/* Uncompressed RGB24 JPEG data, before translated, can be up to 3
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times larger, if VNC bpp is 8. */
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rdr::U8* buf = reader->getImageBuf(r.area()*3);
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switch (reader->bpp()) {
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case 8:
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tightDecode8 (r, is, zis, (rdr::U8*) buf, handler); break;
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case 16:
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tightDecode16(r, is, zis, (rdr::U16*)buf, handler); break;
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case 32:
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tightDecode32(r, is, zis, (rdr::U32*)buf, handler); break;
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}
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}
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//
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// A "Source manager" for the JPEG library.
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//
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static struct jpeg_source_mgr jpegSrcManager;
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static JOCTET *jpegBufferPtr;
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static size_t jpegBufferLen;
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static void JpegInitSource(j_decompress_ptr cinfo);
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static boolean JpegFillInputBuffer(j_decompress_ptr cinfo);
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static void JpegSkipInputData(j_decompress_ptr cinfo, long num_bytes);
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static void JpegTermSource(j_decompress_ptr cinfo);
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static void
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JpegInitSource(j_decompress_ptr cinfo)
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{
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jpegError = false;
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}
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static boolean
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JpegFillInputBuffer(j_decompress_ptr cinfo)
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{
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jpegError = true;
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jpegSrcManager.bytes_in_buffer = jpegBufferLen;
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jpegSrcManager.next_input_byte = (JOCTET *)jpegBufferPtr;
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return TRUE;
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}
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static void
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JpegSkipInputData(j_decompress_ptr cinfo, long num_bytes)
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{
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if (num_bytes < 0 || (size_t)num_bytes > jpegSrcManager.bytes_in_buffer) {
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jpegError = true;
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jpegSrcManager.bytes_in_buffer = jpegBufferLen;
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jpegSrcManager.next_input_byte = (JOCTET *)jpegBufferPtr;
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} else {
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jpegSrcManager.next_input_byte += (size_t) num_bytes;
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jpegSrcManager.bytes_in_buffer -= (size_t) num_bytes;
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}
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}
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static void
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JpegTermSource(j_decompress_ptr cinfo)
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{
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/* No work necessary here. */
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}
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static void
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JpegSetSrcManager(j_decompress_ptr cinfo, char *compressedData, int compressedLen)
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{
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jpegBufferPtr = (JOCTET *)compressedData;
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jpegBufferLen = (size_t)compressedLen;
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jpegSrcManager.init_source = JpegInitSource;
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jpegSrcManager.fill_input_buffer = JpegFillInputBuffer;
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jpegSrcManager.skip_input_data = JpegSkipInputData;
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jpegSrcManager.resync_to_restart = jpeg_resync_to_restart;
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jpegSrcManager.term_source = JpegTermSource;
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jpegSrcManager.next_input_byte = jpegBufferPtr;
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jpegSrcManager.bytes_in_buffer = jpegBufferLen;
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cinfo->src = &jpegSrcManager;
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}
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