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/***************************************************************************
* Copyright (C) 2005 by Enrico Ros <[email protected]> *
* *
* 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;
}
}
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