workspace/kwin/effects/showpaint.cpp

   1 /********************************************************************
   2  KWin - the KDE window manager
   3  This file is part of the KDE project.
   4
   5 Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *********************************************************************/
  20
  21 #include "showpaint.h"
  22
  23 #include <kwinconfig.h>
  24
  25 #ifdef KWIN_HAVE_OPENGL_COMPOSITING
  26 #include <GL/gl.h>
  27 #endif
  28 #ifdef KWIN_HAVE_XRENDER_COMPOSITING
  29 #include <X11/Xlib.h>
  30 #include <X11/extensions/Xrender.h>
  31 #endif
  32
  33 #include <math.h>
  34
  35 #include <qcolor.h>
  36
  37 namespace KWin
  38 {
  39
  40 KWIN_EFFECT( showpaint, ShowPaintEffect )
  41
  42 static QColor colors[] = { Qt::red, Qt::green, Qt::blue, Qt::cyan, Qt::magenta,
  43     Qt::yellow, Qt::gray };
  44
  45 ShowPaintEffect::ShowPaintEffect()
  46     : color_index( 0 )
  47     {
  48     }
  49
  50 void ShowPaintEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
  51     {
  52     painted = QRegion();
  53     effects->paintScreen( mask, region, data );
  54 #ifdef KWIN_HAVE_OPENGL_COMPOSITING
  55     if( effects->compositingType() == OpenGLCompositing)
  56         paintGL();
  57 #endif
  58 #ifdef KWIN_HAVE_XRENDER_COMPOSITING
  59     if( effects->compositingType() == XRenderCompositing)
  60         paintXrender();
  61 #endif
  62     if( ++color_index == sizeof( colors ) / sizeof( colors[ 0 ] ))
  63         color_index = 0;
  64     }
  65
  66 void ShowPaintEffect::paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
  67     {
  68     painted |= region;
  69     effects->paintWindow( w, mask, region, data );
  70     }
  71
  72 // TODO I think we need some kind of generic paintRect()
  73 void ShowPaintEffect::paintGL()
  74     {
  75 #ifdef KWIN_HAVE_OPENGL_COMPOSITING
  76     glPushAttrib( GL_CURRENT_BIT | GL_ENABLE_BIT );
  77     glEnable( GL_BLEND );
  78     glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
  79     float alpha = 0.2;
  80     const QColor& color = colors[ color_index ];
  81     glColor4f( color.red() / 255., color.green() / 255., color.blue() / 255., alpha );
  82     glBegin( GL_QUADS );
  83     foreach( const QRect &r, painted.rects())
  84         {
  85         glVertex2i( r.x(), r.y());
  86         glVertex2i( r.x() + r.width(), r.y());
  87         glVertex2i( r.x() + r.width(), r.y() + r.height());
  88         glVertex2i( r.x(), r.y() + r.height());
  89         }
  90     glEnd();
  91     glPopAttrib();
  92 #endif
  93     }
  94
  95 void ShowPaintEffect::paintXrender()
  96     {
  97 #ifdef KWIN_HAVE_XRENDER_COMPOSITING
  98     XRenderColor col;
  99     float alpha = 0.2;
 100     const QColor& color = colors[ color_index ];
 101     col.alpha = int( alpha * 0xffff );
 102     col.red = int( alpha * 0xffff * color.red() / 255 );
 103     col.green = int( alpha * 0xffff * color.green() / 255 );
 104     col.blue= int( alpha * 0xffff * color.blue() / 255 );
 105     foreach( const QRect &r, painted.rects())
 106         XRenderFillRectangle( display(), PictOpOver, effects->xrenderBufferPicture(),
 107             &col, r.x(), r.y(), r.width(), r.height());
 108 #endif
 109     }
 110
 111 } // namespace