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253 lines
11 KiB
253 lines
11 KiB
/***************************************************************************
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* Copyright (C) 2005 by Enrico Ros <eros.kde@email.it> *
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* *
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* This program 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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// qt / kde includes
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#include <tqrect.h>
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#include <tqpainter.h>
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#include <tqpixmap.h>
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#include <tqimage.h>
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#include <tqapplication.h>
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#include <kimageeffect.h>
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// local includes
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#include "pagepainter.h"
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#include "core/page.h"
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#include "conf/settings.h"
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void PagePainter::paintPageOnPainter( const KPDFPage * page, int id, int flags,
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TQPainter * destPainter, const TQRect & limits, int width, int height )
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{
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TQPixmap * pixmap = 0;
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// if a pixmap is present for given id, use it
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if ( page->m_pixmaps.contains( id ) )
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pixmap = page->m_pixmaps[ id ];
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// else find the closest match using pixmaps of other IDs (great optim!)
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else if ( !page->m_pixmaps.isEmpty() && width != -1 )
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{
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int minDistance = -1;
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TQMap< int,TQPixmap * >::const_iterator it = page->m_pixmaps.begin(), end = page->m_pixmaps.end();
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for ( ; it != end; ++it )
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{
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int pixWidth = (*it)->width(),
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distance = pixWidth > width ? pixWidth - width : width - pixWidth;
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if ( minDistance == -1 || distance < minDistance )
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{
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pixmap = *it;
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minDistance = distance;
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}
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}
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}
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// if have no pixmap, draw blank page with gray cross and exit
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if ( !pixmap )
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{
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TQColor color = TQt::white;
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if ( KpdfSettings::changeColors() )
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{
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switch ( KpdfSettings::renderMode() )
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{
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case KpdfSettings::EnumRenderMode::Inverted:
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color = TQt::black;
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break;
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case KpdfSettings::EnumRenderMode::Paper:
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color = KpdfSettings::paperColor();
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break;
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case KpdfSettings::EnumRenderMode::Recolor:
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color = KpdfSettings::recolorBackground();
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break;
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default: ;
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}
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}
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destPainter->fillRect( limits, color );
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// draw a cross (to that the pixmap as not yet been loaded)
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// helps a lot on pages that take much to render
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destPainter->setPen( TQt::gray );
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destPainter->drawLine( 0, 0, width-1, height-1 );
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destPainter->drawLine( 0, height-1, width-1, 0 );
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// idea here: draw a hourglass (or kpdf icon :-) on top-left corner
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return;
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}
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// find out what to paint over the pixmap (manipulations / overlays)
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bool paintAccessibility = (flags & Accessibility) && KpdfSettings::changeColors() && (KpdfSettings::renderMode() != KpdfSettings::EnumRenderMode::Paper);
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bool paintHighlights = (flags & Highlights) && !page->m_highlights.isEmpty();
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bool enhanceLinks = (flags & EnhanceLinks) && KpdfSettings::highlightLinks();
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bool enhanceImages = (flags & EnhanceImages) && KpdfSettings::highlightImages();
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// check if there are really some highlightRects to paint
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if ( paintHighlights )
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{
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// precalc normalized 'limits rect' for intersection
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double nXMin = (double)limits.left() / (double)width,
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nXMax = (double)limits.right() / (double)width,
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nYMin = (double)limits.top() / (double)height,
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nYMax = (double)limits.bottom() / (double)height;
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// if no rect intersects limits, disable paintHighlights
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paintHighlights = false;
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TQValueList< HighlightRect * >::const_iterator hIt = page->m_highlights.begin(), hEnd = page->m_highlights.end();
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for ( ; hIt != hEnd; ++hIt )
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{
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if ( (*hIt)->intersects( nXMin, nYMin, nXMax, nYMax ) )
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{
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paintHighlights = true;
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break;
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}
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}
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}
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// use backBuffer if 'pixmap direct manipulation' is needed
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bool backBuffer = paintAccessibility || paintHighlights;
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TQPixmap * backPixmap = 0;
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TQPainter * p = destPainter;
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if ( backBuffer )
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{
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// let's paint using a buffered painter
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backPixmap = new TQPixmap( limits.width(), limits.height() );
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p = new TQPainter( backPixmap );
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p->translate( -limits.left(), -limits.top() );
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}
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// 1. fast blit the pixmap if it has the right size..
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if ( pixmap->width() == width && pixmap->height() == height )
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p->drawPixmap( limits.topLeft(), *pixmap, limits );
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// ..else set a scale matrix to the painter and paint a quick 'zoomed' pixmap
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else
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{
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p->save();
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// TODO paint only the needed part (note: hope that TQt4 transforms are faster)
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p->scale( width / (double)pixmap->width(), height / (double)pixmap->height() );
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p->drawPixmap( 0,0, *pixmap, 0,0, pixmap->width(), pixmap->height() );
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p->restore();
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}
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// 2. mangle pixmap: convert it to 32-bit qimage and perform pixel-level manipulations
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if ( backBuffer )
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{
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TQImage backImage = backPixmap->convertToImage();
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// 2.1. modify pixmap following accessibility settings
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if ( paintAccessibility )
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{
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switch ( KpdfSettings::renderMode() )
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{
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case KpdfSettings::EnumRenderMode::Inverted:
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// Invert image pixels using TQImage internal function
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backImage.tqinvertPixels(false);
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break;
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case KpdfSettings::EnumRenderMode::Recolor:
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// Recolor image using KImageEffect::flatten with dither:0
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KImageEffect::flatten( backImage, KpdfSettings::recolorForeground(), KpdfSettings::recolorBackground() );
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break;
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case KpdfSettings::EnumRenderMode::BlackWhite:
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// Manual Gray and Contrast
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unsigned int * data = (unsigned int *)backImage.bits();
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int val, pixels = backImage.width() * backImage.height(),
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con = KpdfSettings::bWContrast(), thr = 255 - KpdfSettings::bWThreshold();
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for( int i = 0; i < pixels; ++i )
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{
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val = tqGray( data[i] );
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if ( val > thr )
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val = 128 + (127 * (val - thr)) / (255 - thr);
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else if ( val < thr )
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val = (128 * val) / thr;
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if ( con > 2 )
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{
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val = con * ( val - thr ) / 2 + thr;
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if ( val > 255 )
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val = 255;
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else if ( val < 0 )
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val = 0;
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}
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data[i] = tqRgba( val, val, val, 255 );
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}
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break;
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}
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}
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// 2.2. highlight rects in page
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if ( paintHighlights )
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{
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// draw highlights that are inside the 'limits' paint region
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TQValueList< HighlightRect * >::const_iterator hIt = page->m_highlights.begin(), hEnd = page->m_highlights.end();
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for ( ; hIt != hEnd; ++hIt )
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{
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HighlightRect * r = *hIt;
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TQRect highlightRect = r->tqgeometry( width, height );
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if ( highlightRect.isValid() && highlightRect.intersects( limits ) )
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{
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// find out the rect to highlight on pixmap
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highlightRect = highlightRect.intersect( limits );
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highlightRect.moveBy( -limits.left(), -limits.top() );
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// highlight composition (product: highlight color * destcolor)
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unsigned int * data = (unsigned int *)backImage.bits();
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int val, newR, newG, newB,
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rh = r->color.red(),
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gh = r->color.green(),
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bh = r->color.blue(),
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offset = highlightRect.top() * backImage.width();
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for( int y = highlightRect.top(); y <= highlightRect.bottom(); ++y )
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{
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for( int x = highlightRect.left(); x <= highlightRect.right(); ++x )
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{
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val = data[ x + offset ];
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newR = (tqRed(val) * rh) / 255;
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newG = (tqGreen(val) * gh) / 255;
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newB = (tqBlue(val) * bh) / 255;
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data[ x + offset ] = tqRgba( newR, newG, newB, 255 );
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}
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offset += backImage.width();
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}
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}
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}
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}
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backPixmap->convertFromImage( backImage );
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}
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// 3. visually enchance links and images if requested
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if ( enhanceLinks || enhanceImages )
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{
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TQColor normalColor = TQApplication::tqpalette().active().highlight();
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TQColor lightColor = normalColor.light( 140 );
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// enlarging limits for intersection is like growing the 'rectGeometry' below
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TQRect limitsEnlarged = limits;
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limitsEnlarged.addCoords( -2, -2, 2, 2 );
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// draw rects that are inside the 'limits' paint region as opaque rects
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TQValueList< ObjectRect * >::const_iterator lIt = page->m_rects.begin(), lEnd = page->m_rects.end();
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for ( ; lIt != lEnd; ++lIt )
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{
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ObjectRect * rect = *lIt;
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if ( (enhanceLinks && rect->objectType() == ObjectRect::Link) ||
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(enhanceImages && rect->objectType() == ObjectRect::Image) )
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{
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TQRect rectGeometry = rect->tqgeometry( width, height );
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if ( rectGeometry.intersects( limitsEnlarged ) )
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{
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// expand rect and draw inner border
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rectGeometry.addCoords( -1,-1,1,1 );
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p->setPen( lightColor );
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p->drawRect( rectGeometry );
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// expand rect to draw outer border
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rectGeometry.addCoords( -1,-1,1,1 );
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p->setPen( normalColor );
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p->drawRect( rectGeometry );
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}
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}
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}
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}
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// 4. if was backbuffering, copy the backPixmap to destination
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if ( backBuffer )
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{
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delete p;
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destPainter->drawPixmap( limits.left(), limits.top(), *backPixmap );
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delete backPixmap;
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}
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}
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