pagepainter.cpp.svn-base

okular

                mixedPainter->drawRect( annotBoundary );
            }
        }
    }

    /** 6 -- MIXED FLOW. Draw LINKS+IMAGES BORDER on ACTIVE PAINTER  **/
    if ( enhanceLinks || enhanceImages )
    {
        mixedPainter->save();
        mixedPainter->scale( scaledWidth, scaledHeight );

        QColor normalColor = QApplication::palette().color( QPalette::Active, QPalette::Highlight );
        QColor lightColor = normalColor.light( 140 );
        // enlarging limits for intersection is like growing the 'rectGeometry' below
        QRect limitsEnlarged = limits;
        limitsEnlarged.adjust( -2, -2, 2, 2 );
        // draw rects that are inside the 'limits' paint region as opaque rects
        QLinkedList< 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) )
            {
                if ( limitsEnlarged.intersects( rect->boundingRect( scaledWidth, scaledHeight ) ) )
                {
                    mixedPainter->strokePath( rect->region(), QPen( normalColor ) );
                }
            }
        }
        mixedPainter->restore();
    }

    /** 7 -- BUFFERED FLOW. Copy BACKPIXMAP on DESTINATION PAINTER **/
    if ( useBackBuffer )
    {
        delete mixedPainter;
        destPainter->drawPixmap( limits.left(), limits.top(), *backPixmap );
        delete backPixmap;
    }

    // delete object containers
    delete bufferedHighlights;
    delete bufferedAnnotations;
    delete unbufferedAnnotations;
}


/** Private Helpers :: Pixmap conversion **/
void PagePainter::cropPixmapOnImage( QImage & dest, const QPixmap * src, const QRect & r )
{
    // handle quickly the case in which the whole pixmap has to be converted
    if ( r == QRect( 0, 0, src->width(), src->height() ) )
    {
        dest = src->toImage();
    }
    // else copy a portion of the src to an internal pixmap (smaller) and convert it
    else
    {
        QPixmap croppedPixmap( r.width(), r.height() );
        copyBlt( &croppedPixmap, 0, 0, src, r.left(), r.top(), r.width(), r.height() );
        dest = croppedPixmap.toImage();
    }
}

void PagePainter::scalePixmapOnImage ( QImage & dest, const QPixmap * src,
    int scaledWidth, int scaledHeight, const QRect & cropRect )
{
    // {source, destination, scaling} params
    int srcWidth = src->width(),
        srcHeight = src->height(),
        destLeft = cropRect.left(),
        destTop = cropRect.top(),
        destWidth = cropRect.width(),
        destHeight = cropRect.height();

    // destination image (same geometry as the pageLimits rect)
    dest = QImage( destWidth, destHeight, 32 );
    unsigned int * destData = (unsigned int *)dest.bits();

    // source image (1:1 conversion from pixmap)
    QImage srcImage = src->toImage();
    unsigned int * srcData = (unsigned int *)srcImage.bits();

    // precalc the x correspondancy conversion in a lookup table
    unsigned int xOffset[ destWidth ];
    for ( int x = 0; x < destWidth; x++ )
        xOffset[ x ] = ((x + destLeft) * srcWidth) / scaledWidth;

    // for each pixel of the destination image apply the color of the
    // corresponsing pixel on the source image (note: keep parenthesis)
    for ( int y = 0; y < destHeight; y++ )
    {
        unsigned int srcOffset = srcWidth * (((destTop + y) * srcHeight) / scaledHeight);
        for ( int x = 0; x < destWidth; x++ )
            (*destData++) = srcData[ srcOffset + xOffset[x] ];
    }
}

/** Private Helpers :: Image Drawing **/
// from Arthur - qt4
inline int qt_div_255(int x) { return (x + (x>>8) + 0x80) >> 8; }

void PagePainter::changeImageAlpha( QImage & image, unsigned int destAlpha )
{
    // iterate over all pixels changing the alpha component value
    unsigned int * data = (unsigned int *)image.bits();
    unsigned int pixels = image.width() * image.height();

    int source, sourceAlpha;
    for( register unsigned int i = 0; i < pixels; ++i )
    {   // optimize this loop keeping byte order into account
        source = data[i];
        if ( (sourceAlpha = qAlpha( source )) == 255 )
        {
            // use destAlpha
            data[i] = qRgba( qRed(source), qGreen(source), qBlue(source), destAlpha );
        }
        else
        {
            // use destAlpha * sourceAlpha product
            sourceAlpha = qt_div_255( destAlpha * sourceAlpha );
            data[i] = qRgba( qRed(source), qGreen(source), qBlue(source), sourceAlpha );
        }
    }
}

void PagePainter::colorizeImage( QImage & grayImage, const QColor & color,
    unsigned int destAlpha )
{
    // iterate over all pixels changing the alpha component value
    unsigned int * data = (unsigned int *)grayImage.bits();
    unsigned int pixels = grayImage.width() * grayImage.height();
    int red = color.red(),
        green = color.green(),
        blue = color.blue();

    int source, sourceSat, sourceAlpha;
    for( register unsigned int i = 0; i < pixels; ++i )
    {   // optimize this loop keeping byte order into account
        source = data[i];
        sourceSat = qRed( source );
        int newR = qt_div_255( sourceSat * red ),
            newG = qt_div_255( sourceSat * green ),
            newB = qt_div_255( sourceSat * blue );
        if ( (sourceAlpha = qAlpha( source )) == 255 )
        {
            // use destAlpha
            data[i] = qRgba( newR, newG, newB, destAlpha );
        }
        else
        {
            // use destAlpha * sourceAlpha product
            if ( destAlpha < 255 )
                sourceAlpha = qt_div_255( destAlpha * sourceAlpha );
            data[i] = qRgba( newR, newG, newB, sourceAlpha );
        }
    }
}

//BEGIN of Anti-Grain dependant code
/** Shape Drawing using Anti-Grain Geometry library **/
// The following code uses the AGG2.3 lib imported into the "painter_agg2"
// directory. This is to be replaced by Arthur calls for drawing antialiased
// primitives, but until that AGG2 does its job very fast and good-looking.

#include "kpdf_pixfmt_rgba.h"
#include "agg_rendering_buffer.h"
#include "agg_renderer_base.h"
#include "agg_scanline_u.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_renderer_scanline.h"
#include "agg_conv_stroke.h"
#include "agg_path_storage.h"

void PagePainter::drawShapeOnImage(
    QImage & image,
    const NormalizedPath & normPath,
    bool closeShape,
    const QPen & pen,
    const QBrush & brush,
    double penWidthMultiplier,
    RasterOperation op
    //float antiAliasRadius
    )
{
    // safety checks
    int pointsNumber = normPath.size();
    if ( pointsNumber < 2 )
        return;

    int imageWidth = image.width();
    int imageHeight = image.height();
    double fImageWidth = (double)imageWidth;
    double fImageHeight = (double)imageHeight;

    // create a 'path'
    agg::path_storage path;
    path.move_to( normPath[ 0 ].x * fImageWidth, normPath[ 0 ].y * fImageHeight );
    for ( int i = 1; i < pointsNumber; i++ )
        path.line_to( normPath[ i ].x * fImageWidth, normPath[ i ].y * fImageHeight );
        //path.curve4( normPath[ i ].x * fImageWidth + 2, normPath[ i ].y * fImageHeight - 2,
        //             normPath[ i ].x * fImageWidth, normPath[ i ].y * fImageHeight );
    if ( closeShape )
        path.close_polygon();

    // create the 'rendering buffer' over qimage memory
    agg::rendering_buffer buffer( image.bits(), imageWidth, imageHeight, imageWidth << 2 );
    // create 'pixel buffer', 'clipped renderer', 'scanline renderer' on bgra32 format
    typedef agg::pixfmt_bgra32 bgra32;
    typedef agg::renderer_base< bgra32 > rb_bgra32;
    bgra32 pixels( buffer, op == Multiply ? 1 : 0 );
    rb_bgra32 rb( pixels );
    agg::renderer_scanline_aa_solid< rb_bgra32 > render( rb );
    // create rasterizer and scaline
    agg::rasterizer_scanline_aa<> rasterizer;
    agg::scanline_u8 scanline;

#if 0
    //draw RAINBOW
    agg::rgba8 span[ imageWidth ];
    for( int x = 0; x < imageWidth; x++ )
    {
        agg::rgba c( 380.0 + 400.0 * x / imageWidth, 0.8 );
        span[ x ] = agg::rgba8(c);
    }
    for( int y = 0; y < imageHeight; y++ )
        pixels.blend_color_hspan( 0, y, imageWidth, span, 0, (123*y)/imageHeight );
#endif

    // fill rect
    if ( brush.style() != Qt::NoBrush )
    {
        const QColor & brushColor = brush.color();
        render.color( agg::rgba8( brushColor.red(), brushColor.green(), brushColor.blue() ) );
        rasterizer.add_path( path );
        agg::render_scanlines( rasterizer, scanline, render );
        rasterizer.reset();
    }

    // stroke outline
    double penWidth = (double)pen.width() * penWidthMultiplier;
    if ( penWidth > 0.1 )
    {
        const QColor & penColor = pen.color();
        render.color( agg::rgba8( penColor.red(), penColor.green(), penColor.blue() ) );
#if 0
        // BSPLINE curve over path
        typedef agg::conv_bspline< agg::path_storage > conv_bspline_type;
        conv_bspline_type bspline( path );
        bspline.interpolation_step( 0.2 );
        agg::conv_stroke< conv_bspline_type > strokedPath( bspline );
#else
        agg::conv_stroke< agg::path_storage > strokedPath( path );
#endif
        strokedPath.width( penWidth );
        rasterizer.add_path( strokedPath );
        agg::render_scanlines( rasterizer, scanline, render );
    }
}

//END of Anti-Grain dependant code