/*

 * Copyright (C) 2006 Eric Seidel (eric@webkit.org)

 * Copyright (C) 2008, 2009 Apple Inc. 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"

#if ENABLE(SVG)

#include "SVGImage.h"

#include "CachedPage.h"

#include "DocumentLoader.h"

#include "FileChooser.h"

#include "FloatRect.h"

#include "Frame.h"

#include "FrameLoader.h"

#include "FrameView.h"

#include "GraphicsContext.h"

#include "HTMLFormElement.h"

#include "ImageBuffer.h"

#include "ImageObserver.h"

#include "Page.h"

#include "RenderView.h"

#include "ResourceError.h"

#include "SVGDocument.h"

#include "SVGLength.h"

#include "SVGRenderSupport.h"

#include "SVGSVGElement.h"

#include "Settings.h"

// Moving this #include above FrameLoader.h causes the Windows build to fail due to warnings about

// alignment in Timer<FrameLoader>. It seems that the definition of EmptyFrameLoaderClient is what

// causes this (removing that definition fixes the warnings), but it isn't clear why.

#include "EmptyClients.h"

namespace WebCore {

class SVGImageChromeClient : public EmptyChromeClient, public Noncopyable {

public:

    SVGImageChromeClient(SVGImage* image)

        : m_image(image)

    {

    }

    SVGImage* image() const { return m_image; }

private:

    virtual void chromeDestroyed()

    {

        m_image = 0;

    }

    virtual void invalidateContentsAndWindow(const IntRect& r, bool)

    {

        if (m_image && m_image->imageObserver())

            m_image->imageObserver()->changedInRect(m_image, r);

    }

    SVGImage* m_image;

};

SVGImage::SVGImage(ImageObserver* observer)

    : Image(observer)

{

}

SVGImage::~SVGImage()

{

    if (m_page) {

        m_page->mainFrame()->loader()->frameDetached(); // Break both the loader and view references to the frame

        // Clear explicitly because we want to delete the page before the ChromeClient.

        // FIXME: I believe that's already guaranteed by C++ object destruction rules,

        // so this may matter only for the assertion below.

        m_page.clear();

    }

    // Verify that page teardown destroyed the Chrome

    ASSERT(!m_chromeClient || !m_chromeClient->image());

}

void SVGImage::setContainerSize(const IntSize& containerSize)

{

    if (containerSize.isEmpty())

        return;

    if (!m_page)

        return;

    Frame* frame = m_page->mainFrame();

    SVGSVGElement* rootElement = static_cast<SVGDocument*>(frame->document())->rootElement();

    if (!rootElement)

        return;

    rootElement->setContainerSize(containerSize);

}

bool SVGImage::usesContainerSize() const

{

    if (!m_page)

        return false;

    Frame* frame = m_page->mainFrame();

    SVGSVGElement* rootElement = static_cast<SVGDocument*>(frame->document())->rootElement();

    if (!rootElement)

        return false;

    return rootElement->hasSetContainerSize();

}

IntSize SVGImage::size() const

{

    if (!m_page)

        return IntSize();

    Frame* frame = m_page->mainFrame();

    SVGSVGElement* rootElement = static_cast<SVGDocument*>(frame->document())->rootElement();

    if (!rootElement)

        return IntSize();

    SVGLength width = rootElement->width();

    SVGLength height = rootElement->height();

    IntSize svgSize;

    if (width.unitType() == LengthTypePercentage) 

        svgSize.setWidth(rootElement->relativeWidthValue());

    else

        svgSize.setWidth(static_cast<int>(width.value(rootElement)));

    if (height.unitType() == LengthTypePercentage) 

        svgSize.setHeight(rootElement->relativeHeightValue());

    else

        svgSize.setHeight(static_cast<int>(height.value(rootElement)));

    return svgSize;

}

bool SVGImage::hasRelativeWidth() const

{

    if (!m_page)

        return false;

    SVGSVGElement* rootElement = static_cast<SVGDocument*>(m_page->mainFrame()->document())->rootElement();

    if (!rootElement)

        return false;

    return rootElement->width().unitType() == LengthTypePercentage;

}

bool SVGImage::hasRelativeHeight() const

{

    if (!m_page)

        return false;

    SVGSVGElement* rootElement = static_cast<SVGDocument*>(m_page->mainFrame()->document())->rootElement();

    if (!rootElement)

        return false;

    return rootElement->height().unitType() == LengthTypePercentage;

}

void SVGImage::draw(GraphicsContext* context, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace, CompositeOperator compositeOp)

{

    if (!m_page)

        return;

    FrameView* view = m_page->mainFrame()->view();

    context->save();

    context->setCompositeOperation(compositeOp);

    context->clip(enclosingIntRect(dstRect));

    if (compositeOp != CompositeSourceOver)

        context->beginTransparencyLayer(1);

    FloatSize scale(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height());

    // We can only draw the entire frame, clipped to the rect we want. So compute where the top left

    // of the image would be if we were drawing without clipping, and translate accordingly.

    FloatSize topLeftOffset(srcRect.location().x() * scale.width(), srcRect.location().y() * scale.height());

    FloatPoint destOffset = dstRect.location() - topLeftOffset;

    context->translate(destOffset.x(), destOffset.y());

    context->scale(scale);

    view->resize(size());

    if (view->needsLayout())

        view->layout();

    view->paint(context, IntRect(0, 0, view->width(), view->height()));

    if (compositeOp != CompositeSourceOver)

        context->endTransparencyLayer();

    context->restore();

    if (imageObserver())

        imageObserver()->didDraw(this);

}

NativeImagePtr SVGImage::nativeImageForCurrentFrame()

{

    // FIXME: In order to support dynamic SVGs we need to have a way to invalidate this

    // frame cache, or better yet, not use a cache for tiled drawing at all, instead

    // having a tiled drawing callback (hopefully non-virtual).

    if (!m_frameCache) {

        if (!m_page)

            return 0;

        m_frameCache = ImageBuffer::create(size());

        if (!m_frameCache) // failed to allocate image

            return 0;

        draw(m_frameCache->context(), rect(), rect(), DeviceColorSpace, CompositeSourceOver);

    }

    return m_frameCache->image()->nativeImageForCurrentFrame();

}

bool SVGImage::dataChanged(bool allDataReceived)

{

    // Don't do anything if is an empty image.

    if (!data()->size())

        return true;

    if (allDataReceived) {

        static FrameLoaderClient* dummyFrameLoaderClient =  new EmptyFrameLoaderClient;

        static EditorClient* dummyEditorClient = new EmptyEditorClient;

#if ENABLE(CONTEXT_MENUS)

        static ContextMenuClient* dummyContextMenuClient = new EmptyContextMenuClient;

#else

        static ContextMenuClient* dummyContextMenuClient = 0;

#endif

#if ENABLE(DRAG_SUPPORT)

        static DragClient* dummyDragClient = new EmptyDragClient;

#else

        static DragClient* dummyDragClient = 0;

#endif

        static InspectorClient* dummyInspectorClient = new EmptyInspectorClient;

        m_chromeClient.set(new SVGImageChromeClient(this));

        // FIXME: If this SVG ends up loading itself, we might leak the world.

        // The comment said that the Cache code does not know about CachedImages

        // holding Frames and won't know to break the cycle. But 

        m_page.set(new Page(m_chromeClient.get(), dummyContextMenuClient, dummyEditorClient, dummyDragClient, dummyInspectorClient, 0, 0, 0, 0));

        m_page->settings()->setMediaEnabled(false);

        m_page->settings()->setJavaScriptEnabled(false);

        m_page->settings()->setPluginsEnabled(false);

        RefPtr<Frame> frame = Frame::create(m_page.get(), 0, dummyFrameLoaderClient);

        frame->setView(FrameView::create(frame.get()));

        frame->init();

        ResourceRequest fakeRequest(KURL(ParsedURLString, ""));

        FrameLoader* loader = frame->loader();

        loader->setForcedSandboxFlags(SandboxAll);

        loader->load(fakeRequest, false); // Make sure the DocumentLoader is created

        loader->policyChecker()->cancelCheck(); // cancel any policy checks

        loader->commitProvisionalLoad();

        loader->writer()->setMIMEType("image/svg+xml");

        loader->writer()->begin(KURL()); // create the empty document

        loader->writer()->addData(data()->data(), data()->size());

        loader->writer()->end();

        frame->view()->setTransparent(true); // SVG Images are transparent.

    }

    return m_page;

}

String SVGImage::filenameExtension() const

{

    return "svg";

}

}

#endif // ENABLE(SVG)