krfb/qtframebuffer.cpp

   1 /* This file is part of the KDE project
   2    Copyright (C) 2007 Alessandro Praduroux <pradu@pradu.it>
   3
   4    This program is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public
   6    License as published by the Free Software Foundation; either
   7    version 2 of the License, or (at your option) any later version.
   8 */
   9
  10 #include "qtframebuffer.h"
  11 #include "qtframebuffer.moc"
  12
  13 #include <QTimer>
  14 #include <QRegion>
  15 #include <QPixmap>
  16 #include <QBitmap>
  17
  18
  19 const int UPDATE_TIME = 500;
  20
  21 QtFrameBuffer::QtFrameBuffer(WId id, QObject *parent)
  22  : FrameBuffer(id, parent)
  23 {
  24     fbImage = QPixmap::grabWindow(win).toImage();
  25     fb = new char[fbImage.numBytes()];
  26     t = new QTimer(this);
  27     connect(t, SIGNAL(timeout()), SLOT(updateFrameBuffer()));
  28 }
  29
  30
  31 QtFrameBuffer::~QtFrameBuffer()
  32 {
  33     delete [] fb;
  34 }
  35
  36 int QtFrameBuffer::depth()
  37 {
  38     return fbImage.depth();
  39 }
  40
  41 int QtFrameBuffer::height()
  42 {
  43     return fbImage.height();
  44 }
  45
  46 int QtFrameBuffer::width()
  47 {
  48     return fbImage.width();
  49 }
  50
  51 void QtFrameBuffer::getServerFormat(rfbPixelFormat& format)
  52 {
  53     format.bitsPerPixel = 32;
  54     format.depth = 32;
  55     format.trueColour = true;
  56
  57     format.bigEndian = false;
  58     format.redShift = 16;
  59     format.greenShift = 8;
  60     format.blueShift = 0;
  61     format.redMax   = 0xff;
  62     format.greenMax = 0xff;
  63     format.blueMax  = 0xff;
  64 }
  65
  66 void QtFrameBuffer::updateFrameBuffer()
  67 {
  68     QImage img = QPixmap::grabWindow(win).toImage();
  69     QSize imgSize = img.size();
  70
  71
  72     // verify what part of the image need to be marked as changed
  73     // fbImage is the previous version of the image,
  74     // img is the current one
  75
  76 #if 0 // This is actually slower than updating the whole desktop...
  77
  78     QImage map(imgSize, QImage::Format_Mono);
  79     map.fill(0);
  80
  81     for (int x = 0; x < imgSize.width(); x++) {
  82     for (int y = 0; y < imgSize.height(); y++) {
  83     if (img.pixel(x,y) != fbImage.pixel(x,y)) {
  84     map.setPixel(x,y,1);
  85 }
  86 }
  87 }
  88
  89     QRegion r(QBitmap::fromImage(map));
  90     tiles = tiles + r.rects();
  91
  92 #else
  93     tiles.append(img.rect());
  94 #endif
  95
  96     memcpy(fb, (const char*)img.bits(), img.numBytes());
  97     fbImage = img;
  98
  99 }
 100
 101 int QtFrameBuffer::paddedWidth()
 102 {
 103     return fbImage.width() * 4;
 104 }
 105
 106 void QtFrameBuffer::startMonitor()
 107 {
 108     t->start(UPDATE_TIME);
 109 }
 110
 111 void QtFrameBuffer::stopMonitor()
 112 {
 113     t->stop();
 114 }
 115