Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 252 insertions, 0 deletions

diff --git a/kpdf/ui/pagepainter.cpp b/kpdf/ui/pagepainter.cpp
new file mode 100644
index 00000000..f68df254
--- /dev/null
+++ b/kpdf/ui/pagepainter.cpp
@@ -0,0 +1,252 @@
+/***************************************************************************
+ *   Copyright (C) 2005 by Enrico Ros <eros.kde@email.it>                  *
+ *                                                                         *
+ *   This program 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.                                   *
+ ***************************************************************************/
+
+// qt / kde includes
+#include <qrect.h>
+#include <qpainter.h>
+#include <qpixmap.h>
+#include <qimage.h>
+#include <qapplication.h>
+#include <kimageeffect.h>
+
+// local includes
+#include "pagepainter.h"
+#include "core/page.h"
+#include "conf/settings.h"
+
+void PagePainter::paintPageOnPainter( const KPDFPage * page, int id, int flags,
+    QPainter * destPainter, const QRect & limits, int width, int height )
+{
+    QPixmap * pixmap = 0;
+
+    // if a pixmap is present for given id, use it
+    if ( page->m_pixmaps.contains( id ) )
+        pixmap = page->m_pixmaps[ id ];
+
+    // else find the closest match using pixmaps of other IDs (great optim!)
+    else if ( !page->m_pixmaps.isEmpty() && width != -1 )
+    {
+        int minDistance = -1;
+        QMap< int,QPixmap * >::const_iterator it = page->m_pixmaps.begin(), end = page->m_pixmaps.end();
+        for ( ; it != end; ++it )
+        {
+            int pixWidth = (*it)->width(),
+                distance = pixWidth > width ? pixWidth - width : width - pixWidth;
+            if ( minDistance == -1 || distance < minDistance )
+            {
+                pixmap = *it;
+                minDistance = distance;
+            }
+        }
+    }
+
+    // if have no pixmap, draw blank page with gray cross and exit
+    if ( !pixmap )
+    {
+        QColor color = Qt::white;
+        if ( KpdfSettings::changeColors() )
+        {
+            switch ( KpdfSettings::renderMode() )
+            {
+                case KpdfSettings::EnumRenderMode::Inverted:
+                    color = Qt::black;
+                    break;
+                case KpdfSettings::EnumRenderMode::Paper:
+                    color = KpdfSettings::paperColor();
+                    break;
+                case KpdfSettings::EnumRenderMode::Recolor:
+                    color = KpdfSettings::recolorBackground();
+                    break;
+                default: ;
+            }
+        }
+        destPainter->fillRect( limits, color );
+
+        // draw a cross (to  that the pixmap as not yet been loaded)
+        // helps a lot on pages that take much to render
+        destPainter->setPen( Qt::gray );
+        destPainter->drawLine( 0, 0, width-1, height-1 );
+        destPainter->drawLine( 0, height-1, width-1, 0 );
+        // idea here: draw a hourglass (or kpdf icon :-) on top-left corner
+        return;
+    }
+
+    // find out what to paint over the pixmap (manipulations / overlays)
+    bool paintAccessibility = (flags & Accessibility) && KpdfSettings::changeColors() && (KpdfSettings::renderMode() != KpdfSettings::EnumRenderMode::Paper);
+    bool paintHighlights = (flags & Highlights) && !page->m_highlights.isEmpty();
+    bool enhanceLinks = (flags & EnhanceLinks) && KpdfSettings::highlightLinks();
+    bool enhanceImages = (flags & EnhanceImages) && KpdfSettings::highlightImages();
+    // check if there are really some highlightRects to paint
+    if ( paintHighlights )
+    {
+        // precalc normalized 'limits rect' for intersection
+        double nXMin = (double)limits.left() / (double)width,
+               nXMax = (double)limits.right() / (double)width,
+               nYMin = (double)limits.top() / (double)height,
+               nYMax = (double)limits.bottom() / (double)height;
+        // if no rect intersects limits, disable paintHighlights
+        paintHighlights = false;
+        QValueList< HighlightRect * >::const_iterator hIt = page->m_highlights.begin(), hEnd = page->m_highlights.end();
+        for ( ; hIt != hEnd; ++hIt )
+        {
+            if ( (*hIt)->intersects( nXMin, nYMin, nXMax, nYMax ) )
+            {
+                paintHighlights = true;
+                break;
+            }
+        }
+    }
+
+    // use backBuffer if 'pixmap direct manipulation' is needed
+    bool backBuffer = paintAccessibility || paintHighlights;
+    QPixmap * backPixmap = 0;
+    QPainter * p = destPainter;
+    if ( backBuffer )
+    {
+        // let's paint using a buffered painter
+        backPixmap = new QPixmap( limits.width(), limits.height() );
+        p = new QPainter( backPixmap );
+        p->translate( -limits.left(), -limits.top() );
+    }
+
+    // 1. fast blit the pixmap if it has the right size..
+    if ( pixmap->width() == width && pixmap->height() == height )
+        p->drawPixmap( limits.topLeft(), *pixmap, limits );
+    // ..else set a scale matrix to the painter and paint a quick 'zoomed' pixmap
+    else
+    {
+        p->save();
+        // TODO paint only the needed part (note: hope that Qt4 transforms are faster)
+        p->scale( width / (double)pixmap->width(), height / (double)pixmap->height() );
+        p->drawPixmap( 0,0, *pixmap, 0,0, pixmap->width(), pixmap->height() );
+        p->restore();
+    }
+
+    // 2. mangle pixmap: convert it to 32-bit qimage and perform pixel-level manipulations
+    if ( backBuffer )
+    {
+        QImage backImage = backPixmap->convertToImage();
+        // 2.1. modify pixmap following accessibility settings
+        if ( paintAccessibility )
+        {
+            switch ( KpdfSettings::renderMode() )
+            {
+                case KpdfSettings::EnumRenderMode::Inverted:
+                    // Invert image pixels using QImage internal function
+                    backImage.invertPixels(false);
+                    break;
+                case KpdfSettings::EnumRenderMode::Recolor:
+                    // Recolor image using KImageEffect::flatten with dither:0
+                    KImageEffect::flatten( backImage, KpdfSettings::recolorForeground(), KpdfSettings::recolorBackground() );
+                    break;
+                case KpdfSettings::EnumRenderMode::BlackWhite:
+                    // Manual Gray and Contrast
+                    unsigned int * data = (unsigned int *)backImage.bits();
+                    int val, pixels = backImage.width() * backImage.height(),
+                        con = KpdfSettings::bWContrast(), thr = 255 - KpdfSettings::bWThreshold();
+                    for( int i = 0; i < pixels; ++i )
+                    {
+                        val = qGray( data[i] );
+                        if ( val > thr )
+                            val = 128 + (127 * (val - thr)) / (255 - thr);
+                        else if ( val < thr )
+                            val = (128 * val) / thr;
+                        if ( con > 2 )
+                        {
+                            val = con * ( val - thr ) / 2 + thr;
+                            if ( val > 255 )
+                                val = 255;
+                            else if ( val < 0 )
+                                val = 0;
+                        }
+                        data[i] = qRgba( val, val, val, 255 );
+                    }
+                    break;
+            }
+        }
+        // 2.2. highlight rects in page
+        if ( paintHighlights )
+        {
+            // draw highlights that are inside the 'limits' paint region
+            QValueList< HighlightRect * >::const_iterator hIt = page->m_highlights.begin(), hEnd = page->m_highlights.end();
+            for ( ; hIt != hEnd; ++hIt )
+            {
+                HighlightRect * r = *hIt;
+                QRect highlightRect = r->geometry( width, height );
+                if ( highlightRect.isValid() && highlightRect.intersects( limits ) )
+                {
+                    // find out the rect to highlight on pixmap
+                    highlightRect = highlightRect.intersect( limits );
+                    highlightRect.moveBy( -limits.left(), -limits.top() );
+
+                    // highlight composition (product: highlight color * destcolor)
+                    unsigned int * data = (unsigned int *)backImage.bits();
+                    int val, newR, newG, newB,
+                        rh = r->color.red(),
+                        gh = r->color.green(),
+                        bh = r->color.blue(),
+                        offset = highlightRect.top() * backImage.width();
+                    for( int y = highlightRect.top(); y <= highlightRect.bottom(); ++y )
+                    {
+                        for( int x = highlightRect.left(); x <= highlightRect.right(); ++x )
+                        {
+                            val = data[ x + offset ];
+                            newR = (qRed(val) * rh) / 255;
+                            newG = (qGreen(val) * gh) / 255;
+                            newB = (qBlue(val) * bh) / 255;
+                            data[ x + offset ] = qRgba( newR, newG, newB, 255 );
+                        }
+                        offset += backImage.width();
+                    }
+                }
+            }
+        }
+        backPixmap->convertFromImage( backImage );
+    }
+
+    // 3. visually enchance links and images if requested
+    if ( enhanceLinks || enhanceImages )
+    {
+        QColor normalColor = QApplication::palette().active().highlight();
+        QColor lightColor = normalColor.light( 140 );
+        // enlarging limits for intersection is like growing the 'rectGeometry' below
+        QRect limitsEnlarged = limits;
+        limitsEnlarged.addCoords( -2, -2, 2, 2 );
+        // draw rects that are inside the 'limits' paint region as opaque rects
+        QValueList< ObjectRect * >::const_iterator lIt = page->m_rects.begin(), lEnd = page->m_rects.end();
+        for ( ; lIt != lEnd; ++lIt )
+        {
+            ObjectRect * rect = *lIt;
+            if ( (enhanceLinks && rect->objectType() == ObjectRect::Link) ||
+                 (enhanceImages && rect->objectType() == ObjectRect::Image) )
+            {
+                QRect rectGeometry = rect->geometry( width, height );
+                if ( rectGeometry.intersects( limitsEnlarged ) )
+                {
+                    // expand rect and draw inner border
+                    rectGeometry.addCoords( -1,-1,1,1 );
+                    p->setPen( lightColor );
+                    p->drawRect( rectGeometry );
+                    // expand rect to draw outer border
+                    rectGeometry.addCoords( -1,-1,1,1 );
+                    p->setPen( normalColor );
+                    p->drawRect( rectGeometry );
+                }
+            }
+        }
+    }
+
+    // 4. if was backbuffering, copy the backPixmap to destination
+    if ( backBuffer )
+    {
+        delete p;
+        destPainter->drawPixmap( limits.left(), limits.top(), *backPixmap );
+        delete backPixmap;
+    }
+}