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https://github.com/TigerVNC/tigervnc.git
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![Constantin Kaplinsky](/assets/img/avatar_default.png)
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2 3789f03b-4d11-0410-bbf8-ca57d06f2519
152 lines
4.6 KiB
C++
152 lines
4.6 KiB
C++
/* Copyright (C) 2002-2004 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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#include <stdio.h>
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#include <vector>
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#include <rdr/types.h>
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#include <rfb/Exception.h>
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#include <rfb/ComparingUpdateTracker.h>
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using namespace rfb;
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ComparingUpdateTracker::ComparingUpdateTracker(PixelBuffer* buffer)
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: SimpleUpdateTracker(true), fb(buffer),
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oldFb(fb->getPF(), 0, 0), firstCompare(true)
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{
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changed.assign_union(fb->getRect());
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}
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ComparingUpdateTracker::~ComparingUpdateTracker()
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{
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}
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void ComparingUpdateTracker::flush_update(UpdateInfo* info,
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const Region& cliprgn, int maxArea)
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{
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throw rfb::Exception("flush_update(UpdateInfo*) not implemented");
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}
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void ComparingUpdateTracker::flush_update(UpdateTracker &ut,
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const Region &cliprgn)
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{
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throw rfb::Exception("flush_update(UpdateTracker&) not implemented");
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}
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#define BLOCK_SIZE 16
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void ComparingUpdateTracker::compare()
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{
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std::vector<Rect> rects;
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std::vector<Rect>::iterator i;
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if (firstCompare) {
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// NB: We leave the change region untouched on this iteration,
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// since in effect the entire framebuffer has changed.
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oldFb.setSize(fb->width(), fb->height());
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for (int y=0; y<fb->height(); y+=BLOCK_SIZE) {
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Rect pos(0, y, fb->width(), min(fb->height(), y+BLOCK_SIZE));
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int srcStride;
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const rdr::U8* srcData = fb->getPixelsR(pos, &srcStride);
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oldFb.imageRect(pos, srcData, srcStride);
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}
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firstCompare = false;
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} else {
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copied.get_rects(&rects, copy_delta.x<=0, copy_delta.y<=0);
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for (i = rects.begin(); i != rects.end(); i++)
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oldFb.copyRect(*i, copy_delta);
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Region to_check = changed.union_(copied);
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to_check.get_rects(&rects);
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Region newChanged;
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for (i = rects.begin(); i != rects.end(); i++)
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compareRect(*i, &newChanged);
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copied.assign_subtract(newChanged);
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changed = newChanged;
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}
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}
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void ComparingUpdateTracker::compareRect(const Rect& r, Region* newChanged)
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{
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if (!r.enclosed_by(fb->getRect())) {
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fprintf(stderr,"ComparingUpdateTracker: rect outside fb (%d,%d-%d,%d)\n", r.tl.x, r.tl.y, r.br.x, r.br.y);
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return;
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}
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int bytesPerPixel = fb->getPF().bpp/8;
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int oldStride;
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rdr::U8* oldData = oldFb.getPixelsRW(r, &oldStride);
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int oldStrideBytes = oldStride * bytesPerPixel;
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std::vector<Rect> changedBlocks;
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for (int blockTop = r.tl.y; blockTop < r.br.y; blockTop += BLOCK_SIZE)
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{
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// Get a strip of the source buffer
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Rect pos(r.tl.x, blockTop, r.br.x, min(r.br.y, blockTop+BLOCK_SIZE));
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int fbStride;
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const rdr::U8* newBlockPtr = fb->getPixelsR(pos, &fbStride);
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int newStrideBytes = fbStride * bytesPerPixel;
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rdr::U8* oldBlockPtr = oldData;
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int blockBottom = min(blockTop+BLOCK_SIZE, r.br.y);
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for (int blockLeft = r.tl.x; blockLeft < r.br.x; blockLeft += BLOCK_SIZE)
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{
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const rdr::U8* newPtr = newBlockPtr;
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rdr::U8* oldPtr = oldBlockPtr;
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int blockRight = min(blockLeft+BLOCK_SIZE, r.br.x);
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int blockWidthInBytes = (blockRight-blockLeft) * bytesPerPixel;
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for (int y = blockTop; y < blockBottom; y++)
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{
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if (memcmp(oldPtr, newPtr, blockWidthInBytes) != 0)
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{
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// A block has changed - copy the remainder to the oldFb
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changedBlocks.push_back(Rect(blockLeft, blockTop,
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blockRight, blockBottom));
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for (int y2 = y; y2 < blockBottom; y2++)
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{
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memcpy(oldPtr, newPtr, blockWidthInBytes);
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newPtr += newStrideBytes;
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oldPtr += oldStrideBytes;
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}
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break;
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}
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newPtr += newStrideBytes;
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oldPtr += oldStrideBytes;
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}
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oldBlockPtr += blockWidthInBytes;
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newBlockPtr += blockWidthInBytes;
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}
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oldData += oldStrideBytes * BLOCK_SIZE;
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}
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if (!changedBlocks.empty()) {
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Region temp;
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temp.setOrderedRects(changedBlocks);
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newChanged->assign_union(temp);
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}
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}
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