WebCore/platform/qt/ImageQt.cpp

/*
 * Copyright (C) 2006 Dirk Mueller <mueller@kde.org>
 * Copyright (C) 2006 Zack Rusin <zack@kde.org>
 * Copyright (C) 2006 Simon Hausmann <hausmann@kde.org>
 *
 * 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 "FloatRect.h"
#include "GraphicsContext.h"

#include <QPixmap>
#include <QPainter>
#include <QImage>
#include <QImageReader>

#include <QtDebug>

#include <math.h>

// This function loads resources from WebKit
Vector<char> loadResourceIntoArray(const char*);

namespace WebCore {

void FrameData::clear()
{
    if (m_frame) {
        m_frame = 0;
        m_duration = 0.;
        m_hasAlpha = true;
    }
}

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

void Image::initNativeData()
{
}

void Image::destroyNativeData()
{
}

void Image::invalidateNativeData()
{
}

Image* Image::loadResource(const char* name)
{
    Vector<char> arr = loadResourceIntoArray(name);
    Image* img = new Image();
    img->setNativeData(&arr, true);
    return img;
}

bool Image::supportsType(const String& type)
{
    qDebug() << "does support image format? "<< type;

    QList<QByteArray> formats = QImageReader::supportedImageFormats();
    foreach(QByteArray format, formats) {
        if (format == (QString) type)
            return true;
    }

    return false;
}

// Drawing Routines
void Image::draw(GraphicsContext* ctxt, const FloatRect& dst,
                 const FloatRect& src, CompositeOperator op)
{
    if (!m_source.initialized())
        return;

    QImage* image = frameAtIndex(m_currentFrame);
    if (!image) // If it's too early we won't have an image yet.
        return;

    IntSize selfSize = size();
    FloatRect srcRect(src);
    FloatRect dstRect(dst);

    ctxt->save();

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

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

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

    ctxt->restore();

    startAnimation();
}

void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatPoint& srcPoint,
                      const FloatSize& tileSize, CompositeOperator op)
{
    if (!m_source.initialized())
        return;

    QImage* image = frameAtIndex(m_currentFrame);
    QPixmap pix;
    if (!image) // If it's too early we won't have an image yet.
        return;

    IntSize intrinsicImageSize = size();

    if (!qFuzzyCompare(tileSize.width(), intrinsicImageSize.width()) ||
        !qFuzzyCompare(tileSize.height(), intrinsicImageSize.height())) {

        QImage img((int)tileSize.width(), (int)tileSize.height(),
                   QImage::Format_ARGB32_Premultiplied);

        QPainter p(&img);
        p.drawImage(QRectF(0, 0, tileSize.width(), tileSize.height()),
                    *image, QRectF(srcPoint.x(), srcPoint.y(),
                                   tileSize.width() - srcPoint.x(), 
                                   tileSize.height()- srcPoint.y()));
        p.end();

        pix = QPixmap::fromImage(img);
    } else
        pix = QPixmap::fromImage(*image);

    ctxt->save();

    // Set the compositing operation.
    ctxt->setCompositeOperation(op);
    QPainter *p = ctxt->platformContext();
    p->drawTiledPixmap(dstRect, pix);

    ctxt->restore();
    
    startAnimation();
}

void Image::checkForSolidColor()
{
    // FIXME: It's easy to implement this optimization. Just need to check the RGBA32 buffer to see if it is 1x1.
    m_isSolidColor = false;
}

}

// vim: ts=4 sw=4 et