Rendering with a tiles manager

Currently it's only available for PDFs and does not support rotation.

CMakeLists.txt

@@ -60,6 +60,7 @@ set(okularcore_SRCS
    core/sourcereference.cpp
    core/textdocumentgenerator.cpp
    core/textpage.cpp
+   core/tilesmanager.cpp
    core/utils.cpp
    core/view.cpp
    core/fileprinter.cpp

core/page.cpp

@@ -134,6 +134,7 @@ Page::Page( uint page, double w, double h, Rotation o )
 Page::~Page()
 {
     deletePixmaps();
+    deleteTilesManagers();
     deleteRects();
     d->deleteHighlights();
     deleteAnnotations();
@@ -203,6 +204,26 @@ void Page::setBoundingBox( const NormalizedRect& bbox )
 
 bool Page::hasPixmap( int id, int width, int height, const NormalizedRect &rect ) const
 {
+    if ( id == 3 )
+    {
+        TilesManager *tm = tilesManager( id );
+        if ( !tm )
+        {
+            tm = new TilesManager( width, height );
+            d->m_tilesManagers.insert( id, tm );
+        }
+
+        // TODO: mark tiles as dirty
+        if ( width != tm->width || height != tm->height )
+        {
+            tm->width = width;
+            tm->height = height;
+            return false;
+        }
+
+        return tm->hasPixmap( rect );
+    }
+
     QMap< int, PagePrivate::PixmapObject >::const_iterator it = d->m_pixmaps.constFind( id );
     if ( it == d->m_pixmaps.constEnd() )
         return false;
@@ -467,6 +488,13 @@ QLinkedList< FormField * > Page::formFields() const
 
 void Page::setPixmap( int id, QPixmap *pixmap, const NormalizedRect &rect )
 {
+    TilesManager *tm = tilesManager( id );
+    if ( tm )
+    {
+        tm->setPixmap( pixmap, rect );
+        return;
+    }
+
     if ( d->m_rotation == Rotation0 ) {
         QMap< int, PagePrivate::PixmapObject >::iterator it = d->m_pixmaps.find( id );
         if ( it != d->m_pixmaps.end() )
@@ -922,3 +950,26 @@ const QPixmap * Page::_o_nearestPixmap( int pixID, int w, int h ) const
 
     return pixmap;
 }
+
+TilesManager *Page::tilesManager( int id ) const
+{
+    TilesManager *tilesManager = 0;
+
+    QMap< int, TilesManager* >::iterator itTilesManager = d->m_tilesManagers.find( id );
+    if ( itTilesManager != d->m_tilesManagers.end() )
+        tilesManager = *itTilesManager;
+
+    return tilesManager;
+}
+
+void Page::deleteTilesManagers()
+{
+    QMap< int, TilesManager* >::iterator itTilesManager = d->m_tilesManagers.begin();
+    while ( itTilesManager != d->m_tilesManagers.end() )
+    {
+        delete (*itTilesManager);
+        itTilesManager++;
+    }
+
+    d->m_tilesManagers.clear();
+}

core/page.h

@@ -31,6 +31,7 @@ class PagePrivate;
 class PageTransition;
 class SourceReference;
 class TextSelection;
+class TilesManager;
 
 /**
  * @short Collector for all the data belonging to a page.
@@ -357,6 +358,16 @@ class OKULAR_EXPORT Page
          */
         void deleteAnnotations();
 
+        /**
+         * Returns the tile manager for the observer with the given @p id.
+         */
+        TilesManager *tilesManager( int id ) const;
+
+        /**
+         * Deletes all tiles managers
+         */
+        void deleteTilesManagers();
+
     private:
         PagePrivate* const d;
         /// @cond PRIVATE

core/page_p.h

@@ -20,6 +20,7 @@
 // local includes
 #include "global.h"
 #include "area.h"
+#include "tilesmanager.h"
 
 class QColor;
 class QDomDocument;
@@ -107,6 +108,7 @@ class PagePrivate
                 Rotation m_rotation;
         };
         QMap< int, PixmapObject > m_pixmaps;
+        QMap< int, TilesManager* > m_tilesManagers;
 
         Page *m_page;
         int m_number;

core/tilesmanager.cpp

@@ -0,0 +1,132 @@
+#include "tilesmanager.h"
+
+#include <QPixmap>
+#include <QtCore/qmath.h>
+
+using namespace Okular;
+
+TilesManager::TilesManager( int width, int height )
+    : width( width ), height( height )
+{
+    for ( int i = 0; i < 16; ++i )
+    {
+        mTiles[ i ] = 0;
+    }
+}
+
+TilesManager::~TilesManager()
+{
+    for ( int i = 0; i < 16; ++i )
+    {
+        if ( mTiles[ i ] )
+        {
+            delete mTiles[ i ];
+            mTiles[ i ] = 0;
+        }
+    }
+}
+
+void TilesManager::setPixmap( QPixmap *pixmap, const NormalizedRect &rect )
+{
+    const double dim = 0.25;
+    int left = qCeil( rect.left/dim );
+    int top = qCeil( rect.top/dim );
+    int right = rect.right/dim;
+    int bottom = rect.bottom/dim;
+
+    const QRect pixmapRect = rect.geometry( width, height );
+
+    for ( int y = top; y < bottom; y++ )
+    {
+        for ( int x = left; x < right; x++ )
+        {
+            const NormalizedRect tileRect( x*dim, y*dim, x*dim+dim, y*dim+dim );
+            int index = 4*y+x;
+            if ( !mTiles[ index ] )
+                mTiles[ index ] = new Tile();
+
+            Tile *tile = mTiles[ index ];
+            tile->rect = tileRect;
+            if ( tile->pixmap )
+                delete (tile->pixmap);
+
+            tile->pixmap = new QPixmap( pixmap->copy( tileRect.geometry( width, height ).translated( -pixmapRect.topLeft() ) ) );
+        }
+    }
+
+    delete pixmap;
+}
+
+bool TilesManager::hasPixmap( const NormalizedRect &rect )
+{
+    const double dim = 0.25;
+    int left = rect.left/dim;
+    int top = rect.top/dim;
+    int right = qCeil( rect.right/dim );
+    int bottom = qCeil( rect.bottom/dim );
+
+    for ( int y = top; y < bottom; y++ )
+    {
+        for ( int x = left; x < right; x++ )
+        {
+            int index = 4*y + x;
+            if ( !mTiles[ index ] )
+                return false;
+
+            if ( !mTiles[ index ]->pixmap )
+                return false;
+
+            const NormalizedRect tileRect( x*dim, y*dim, x*dim+dim, y*dim+dim );
+            QRect tileQRect = tileRect.geometry( width, height );
+            if ( tileQRect.width() != mTiles[ index ]->pixmap->width() )
+                return false;
+            if ( tileQRect.height() != mTiles[ index ]->pixmap->height() )
+                return false;
+        }
+    }
+
+    return true;
+}
+
+QList<Tile*> TilesManager::tilesAt( const NormalizedRect &rect ) const
+{
+    QList<Tile*> result;
+
+    const double dim = 0.25;
+    int left = rect.left/dim;
+    int top = rect.top/dim;
+    int right = qCeil( rect.right/dim );
+    int bottom = qCeil( rect.bottom/dim );
+
+    for ( int y = top; y < bottom; y++ )
+    {
+        for ( int x = left; x < right; x++ )
+        {
+            int index = 4*y + x;
+            if ( mTiles[ index ] )
+            {
+                if ( !mTiles[ index ]->pixmap )
+                    continue;
+
+                const NormalizedRect tileRect( x*dim, y*dim, x*dim+dim, y*dim+dim );
+                QRect tileQRect = tileRect.geometry( width, height );
+                if ( tileQRect.width() == mTiles[ index ]->pixmap->width()
+                        && tileQRect.height() == mTiles[ index ]->pixmap->height() )
+                {
+                    result.append( mTiles[ index ] );
+                }
+            }
+        }
+    }
+
+    return result;
+}
+
+Tile::Tile()
+    : pixmap( 0 )
+{
+}
+
+Tile::~Tile() {
+    delete pixmap;
+}

core/tilesmanager.h

@@ -0,0 +1,42 @@
+#ifndef _OKULAR_TILES_MANAGER_H_
+#define _OKULAR_TILES_MANAGER_H_
+
+#include "okular_export.h"
+#include "area.h"
+
+class QPixmap;
+
+namespace Okular {
+
+class Tile;
+
+class OKULAR_EXPORT TilesManager
+{
+    public:
+        TilesManager( int width, int height );
+        virtual ~TilesManager();
+
+        void setPixmap( QPixmap *pixmap, const NormalizedRect &rect );
+        bool hasPixmap( const NormalizedRect &rect );
+        QList<Tile*> tilesAt( const NormalizedRect &rect ) const;
+
+        int width;
+        int height;
+
+    private:
+        Tile *mTiles[16];
+};
+
+class OKULAR_EXPORT Tile
+{
+    public:
+        Tile();
+        virtual ~Tile();
+
+        NormalizedRect rect;
+        QPixmap *pixmap;
+};
+
+}
+
+#endif // _OKULAR_TILES_MANAGER_H_

ui/pagepainter.cpp

@@ -30,6 +30,7 @@
 #include "core/utils.h"
 #include "guiutils.h"
 #include "settings.h"
+#include "core/tilesmanager.h"
 
 K_GLOBAL_STATIC_WITH_ARGS( QPixmap, busyPixmap, ( KIconLoader::global()->loadIcon("okular", KIconLoader::NoGroup, 32, KIconLoader::DefaultState, QStringList(), 0, true) ) )
 
@@ -63,9 +64,6 @@ void PagePainter::paintCroppedPageOnPainter( QPainter * destPainter, const Okula
 	int croppedWidth = scaledCrop.width();
 	int croppedHeight = scaledCrop.height();
 
-    /** 1 - RETRIEVE THE 'PAGE+ID' PIXMAP OR A SIMILAR 'PAGE' ONE **/
-    const QPixmap * pixmap = page->_o_nearestPixmap( pixID, scaledWidth, scaledHeight );
-
     QColor color = Qt::white;
     if ( Okular::Settings::changeColors() )
     {
@@ -85,24 +83,32 @@ void PagePainter::paintCroppedPageOnPainter( QPainter * destPainter, const Okula
     }
     destPainter->fillRect( limits, color );
 
-    /** 1B - IF NO PIXMAP, DRAW EMPTY PAGE **/
-    double pixmapRescaleRatio = pixmap ? limits.width() / (double)pixmap->width() : -1;
-    long pixmapPixels = pixmap ? (long)pixmap->width() * (long)pixmap->height() : 0;
-    if ( !pixmap || pixmapRescaleRatio > 20.0 || pixmapRescaleRatio < 0.25 ||
-         (limits.width() != pixmap->width() && pixmapPixels > 6000000L) )
+    Okular::TilesManager *tilesManager = page->tilesManager( pixID );
+    const QPixmap *pixmap = 0;
+    if ( !tilesManager )
     {
-        // draw something on the blank page: the okular icon or a cross (as a fallback)
-        if ( !busyPixmap->isNull() )
+        /** 1 - RETRIEVE THE 'PAGE+ID' PIXMAP OR A SIMILAR 'PAGE' ONE **/
+        pixmap = page->_o_nearestPixmap( pixID, scaledWidth, scaledHeight );
+
+        /** 1B - IF NO PIXMAP, DRAW EMPTY PAGE **/
+        double pixmapRescaleRatio = pixmap ? scaledWidth / (double)pixmap->width() : -1;
+        long pixmapPixels = pixmap ? (long)pixmap->width() * (long)pixmap->height() : 0;
+        if ( !pixmap || pixmapRescaleRatio > 20.0 || pixmapRescaleRatio < 0.25 ||
+             (scaledWidth != pixmap->width() && pixmapPixels > 6000000L) )
         {
-            destPainter->drawPixmap( QPoint( 10, 10 ), *busyPixmap );
-        }
-        else
-        {
-            destPainter->setPen( Qt::gray );
-            destPainter->drawLine( 0, 0, croppedWidth-1, croppedHeight-1 );
-            destPainter->drawLine( 0, croppedHeight-1, croppedWidth-1, 0 );
+            // draw something on the blank page: the okular icon or a cross (as a fallback)
+            if ( !busyPixmap->isNull() )
+            {
+                destPainter->drawPixmap( QPoint( 10, 10 ), *busyPixmap );
+            }
+            else
+            {
+                destPainter->setPen( Qt::gray );
+                destPainter->drawLine( 0, 0, croppedWidth-1, croppedHeight-1 );
+                destPainter->drawLine( 0, croppedHeight-1, croppedWidth-1, 0 );
+            }
+            return;
         }
-        return;
     }
 
     /** 2 - FIND OUT WHAT TO PAINT (Flags + Configuration + Presence) **/
@@ -230,8 +236,32 @@ void PagePainter::paintCroppedPageOnPainter( QPainter * destPainter, const Okula
     /** 4A -- REGULAR FLOW. PAINT PIXMAP NORMAL OR RESCALED USING GIVEN QPAINTER **/
     if ( !useBackBuffer )
     {
-        // 4A.1. if size is ok, draw the page pixmap using painter
-        destPainter->drawPixmap( limits.topLeft(), *pixmap );
+        if ( tilesManager )
+        {
+            QList<Okular::Tile*> tiles = tilesManager->tilesAt( crop );
+            QList<Okular::Tile*>::const_iterator tIt = tiles.constBegin(), tEnd = tiles.constEnd();
+            while ( tIt != tEnd )
+            {
+                Okular::Tile *tile = *tIt;
+                destPainter->drawPixmap( tile->rect.geometry( scaledWidth, scaledHeight ).topLeft(), *(tile->pixmap) );
+                tIt++;
+            }
+        }
+        else
+        {
+            // 4A.1. if size is ok, draw the page pixmap using painter
+            if ( pixmap->width() == scaledWidth && pixmap->height() == scaledHeight )
+                destPainter->drawPixmap( limits.topLeft(), *pixmap, limitsInPixmap );
+
+            // else draw a scaled portion of the magnified pixmap
+            else
+            {
+                QImage destImage;
+                scalePixmapOnImage( destImage, pixmap, scaledWidth, scaledHeight, limitsInPixmap );
+                destPainter->drawImage( limits.left(), limits.top(), destImage, 0, 0,
+                                         limits.width(),limits.height() );
+            }
+        }
 
         // 4A.2. active painter is the one passed to this method
         mixedPainter = destPainter;

ui/pageview.cpp

@@ -3983,10 +3983,27 @@ void PageView::slotRequestVisiblePixmaps( int newValue )
 #ifdef PAGEVIEW_DEBUG
             kWarning() << "rerequesting visible pixmaps for page" << i->pageNumber() << "!";
 #endif
-            Okular::PixmapRequest * p = new Okular::PixmapRequest(
-                    PAGEVIEW_ID, i->pageNumber(), i->uncroppedWidth(), i->uncroppedHeight(), PAGEVIEW_PRIO, true );
-            p->setNormalizedRect( vItem->rect );
-            requestedPixmaps.push_back( p );
+            const double dim = 0.25;
+            int left = vItem->rect.left/dim;
+            int top = vItem->rect.top/dim;
+            int right = ceil( vItem->rect.right/dim );
+            int bottom = ceil( vItem->rect.bottom/dim );
+
+            for ( int y = top; y < bottom; y++ )
+            {
+                for ( int x = left; x < right; x++ )
+                {
+                    const Okular::NormalizedRect tileRect( x*dim, y*dim, x*dim+dim, y*dim+dim );
+
+                    if ( !i->page()->hasPixmap( PAGEVIEW_ID, i->uncroppedWidth(), i->uncroppedHeight(), tileRect ) )
+                    {
+                        Okular::PixmapRequest * p = new Okular::PixmapRequest(
+                                PAGEVIEW_ID, i->pageNumber(), i->uncroppedWidth(), i->uncroppedHeight(), PAGEVIEW_PRIO, true );
+                        p->setNormalizedRect( tileRect );
+                        requestedPixmaps.push_back( p );
+                    }
+                }
+            }
         }
 
         // look for the item closest to viewport center and the relative