imageqt.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2006 Dirk Mueller <[e-mail]>
 * Copyright (C) 2006 Zack Rusin <[e-mail]>
 * Copyright (C) 2006 Simon Hausmann <[e-mail]>
 * Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "Image.h"

#include "BitmapImage.h"
#include "FloatRect.h"
#include "PlatformString.h"
#include "GraphicsContext.h"
#include "TransformationMatrix.h"
#include "NotImplemented.h"
#include "StillImageQt.h"
#include "qwebsettings.h"

#include <QPixmap>
#include <QPainter>
#include <QImage>
#include <QImageReader>
#if QT_VERSION >= 0x040300
#include <QTransform>
#endif

#include <QDebug>

#include <math.h>

// This function loads resources into WebKit
static QPixmap loadResourcePixmap(const char *name)
{
    QPixmap pixmap;
    if (qstrcmp(name, "missingImage") == 0)
        pixmap = QWebSettings::webGraphic(QWebSettings::MissingImageGraphic);
    else if (qstrcmp(name, "nullPlugin") == 0)
        pixmap = QWebSettings::webGraphic(QWebSettings::MissingPluginGraphic);
    else if (qstrcmp(name, "urlIcon") == 0)
        pixmap = QWebSettings::webGraphic(QWebSettings::DefaultFrameIconGraphic);
    else if (qstrcmp(name, "textAreaResizeCorner") == 0)
        pixmap = QWebSettings::webGraphic(QWebSettings::TextAreaSizeGripCornerGraphic);

    return pixmap;
}

namespace WebCore {

bool FrameData::clear(bool clearMetadata)
{
    if (clearMetadata)
        m_haveMetadata = false;

    if (m_frame) {
        m_frame = 0;
        return true;
    }
    return false;
}


    
// ================================================
// Image Class
// ================================================

PassRefPtr<Image> Image::loadPlatformResource(const char* name)
{
    return StillImage::create(loadResourcePixmap(name));
}

    
void Image::drawPattern(GraphicsContext* ctxt, const FloatRect& tileRect, const TransformationMatrix& patternTransform,
                        const FloatPoint& phase, CompositeOperator op, const FloatRect& destRect)
{
    QPixmap* framePixmap = nativeImageForCurrentFrame();
    if (!framePixmap) // If it's too early we won't have an image yet.
        return;

    QPixmap pixmap = *framePixmap;
    QRect tr = QRectF(tileRect).toRect();
    if (tr.x() || tr.y() || tr.width() != pixmap.width() || tr.height() != pixmap.height()) {
        pixmap = pixmap.copy(tr);
    }

    QBrush b(pixmap);
    b.setTransform(patternTransform);
    ctxt->save();
    ctxt->setCompositeOperation(op);
    QPainter* p = ctxt->platformContext();
    if (!pixmap.hasAlpha() && p->compositionMode() == QPainter::CompositionMode_SourceOver)
        p->setCompositionMode(QPainter::CompositionMode_Source);
    p->setBrushOrigin(phase);
    p->fillRect(destRect, b);
    ctxt->restore();
}

void BitmapImage::initPlatformData()
{
}

void BitmapImage::invalidatePlatformData()
{
}
    
// Drawing Routines
void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dst,
                       const FloatRect& src, CompositeOperator op)
{
    startAnimation();

    QPixmap* image = nativeImageForCurrentFrame();
    if (!image)
        return;
    
    if (mayFillWithSolidColor()) {
        fillWithSolidColor(ctxt, dst, solidColor(), op);
        return;
    }

    IntSize selfSize = size();

    ctxt->save();

    // Set the compositing operation.
    ctxt->setCompositeOperation(op);

    QPainter* painter(ctxt->platformContext());

    if (!image->hasAlpha() && painter->compositionMode() == QPainter::CompositionMode_SourceOver)
        painter->setCompositionMode(QPainter::CompositionMode_Source);

    // Test using example site at
    // http://www.meyerweb.com/eric/css/edge/complexspiral/demo.html    
    painter->drawPixmap(dst, *image, src);

    ctxt->restore();
}

void BitmapImage::checkForSolidColor()
{
    m_isSolidColor = false;
    m_checkedForSolidColor = true;

    if (frameCount() > 1)
        return;

    QPixmap* framePixmap = frameAtIndex(0);
    if (!framePixmap || framePixmap->width() != 1 || framePixmap->height() != 1)
        return;

    m_isSolidColor = true;
    m_solidColor = QColor(framePixmap->toImage().pixel(0, 0));
}

}


// vim: ts=4 sw=4 et