khtml/svg/graphics/SVGImage.cpp

   1 /*
   2  * Copyright (C) 2006 Eric Seidel (eric@webkit.org)
   3  * Copyright (C) 2008 Apple, Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "config.h"
  28 #if ENABLE(SVG)
  29 #include "SVGImage.h"
  30
  31 #include "CachedPage.h"
  32 #include "DocumentLoader.h"
  33 #include "EditCommand.h"
  34 #include "FloatRect.h"
  35 #include "Frame.h"
  36 #include "FrameLoader.h"
  37 #include "FrameView.h"
  38 #include "GraphicsContext.h"
  39 #include "ImageObserver.h"
  40 #include "NotImplemented.h"
  41 #include "Page.h"
  42 #include "RenderView.h"
  43 #include "ResourceError.h"
  44 #include "SVGDocument.h"
  45 #include "SVGLength.h"
  46 #include "SVGRenderSupport.h"
  47 #include "SVGSVGElement.h"
  48 #include "Settings.h"
  49
  50 #include "SVGImageEmptyClients.h"
  51
  52 namespace WebCore {
  53
  54 SVGImage::SVGImage(ImageObserver* observer)
  55     : Image(observer)
  56     , m_document(0)
  57     , m_page(0)
  58     , m_frame(0)
  59     , m_frameView(0)
  60 {
  61 }
  62
  63 SVGImage::~SVGImage()
  64 {
  65     if (m_frame)
  66         m_frame->loader()->frameDetached(); // Break both the loader and view references to the frame
  67 }
  68
  69 void SVGImage::setContainerSize(const IntSize& containerSize)
  70 {
  71     if (containerSize.width() <= 0 || containerSize.height() <= 0)
  72         return;
  73
  74     if (!m_frame || !m_frame->document())
  75         return;
  76     SVGSVGElement* rootElement = static_cast<SVGDocument*>(m_frame->document())->rootElement();
  77     if (!rootElement)
  78         return;
  79
  80     rootElement->setContainerSize(containerSize);
  81 }
  82
  83 bool SVGImage::usesContainerSize() const
  84 {
  85     if (!m_frame || !m_frame->document())
  86         return false;
  87     SVGSVGElement* rootElement = static_cast<SVGDocument*>(m_frame->document())->rootElement();
  88     if (!rootElement)
  89         return false;
  90
  91     return rootElement->hasSetContainerSize();
  92 }
  93
  94 IntSize SVGImage::size() const
  95 {
  96     if (!m_frame || !m_frame->document())
  97         return IntSize();
  98
  99     SVGSVGElement* rootElement = static_cast<SVGDocument*>(m_frame->document())->rootElement();
 100     if (!rootElement)
 101         return IntSize();
 102
 103     SVGLength width = rootElement->width();
 104     SVGLength height = rootElement->height();
 105
 106     IntSize svgSize;
 107     if (width.unitType() == LengthTypePercentage)
 108         svgSize.setWidth(rootElement->relativeWidthValue());
 109     else
 110         svgSize.setWidth(static_cast<int>(width.value()));
 111
 112     if (height.unitType() == LengthTypePercentage)
 113         svgSize.setHeight(rootElement->relativeHeightValue());
 114     else
 115         svgSize.setHeight(static_cast<int>(height.value()));
 116
 117     return svgSize;
 118 }
 119
 120 bool SVGImage::hasRelativeWidth() const
 121 {
 122     if (!m_frame || !m_frame->document())
 123         return false;
 124     SVGSVGElement* rootElement = static_cast<SVGDocument*>(m_frame->document())->rootElement();
 125     if (!rootElement)
 126         return false;
 127
 128     return rootElement->width().unitType() == LengthTypePercentage;
 129 }
 130
 131 bool SVGImage::hasRelativeHeight() const
 132 {
 133     if (!m_frame || !m_frame->document())
 134         return false;
 135     SVGSVGElement* rootElement = static_cast<SVGDocument*>(m_frame->document())->rootElement();
 136     if (!rootElement)
 137         return false;
 138
 139     return rootElement->height().unitType() == LengthTypePercentage;
 140 }
 141
 142 void SVGImage::draw(GraphicsContext* context, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp)
 143 {
 144     if (!m_frame)
 145         return;
 146
 147     context->save();
 148     context->setCompositeOperation(compositeOp);
 149     context->clip(enclosingIntRect(dstRect));
 150     if (compositeOp != CompositeSourceOver)
 151         context->beginTransparencyLayer(1.0f);
 152     context->translate(dstRect.location().x(), dstRect.location().y());
 153     context->scale(FloatSize(dstRect.width()/srcRect.width(), dstRect.height()/srcRect.height()));
 154
 155     if (m_frame->view()->needsLayout())
 156         m_frame->view()->layout();
 157     m_frame->paint(context, enclosingIntRect(srcRect));
 158
 159     if (compositeOp != CompositeSourceOver)
 160         context->endTransparencyLayer();
 161
 162     context->restore();
 163
 164     if (imageObserver())
 165         imageObserver()->didDraw(this);
 166 }
 167
 168 NativeImagePtr SVGImage::nativeImageForCurrentFrame()
 169 {
 170     // FIXME: In order to support dynamic SVGs we need to have a way to invalidate this
 171     // frame cache, or better yet, not use a cache for tiled drawing at all, instead
 172     // having a tiled drawing callback (hopefully non-virtual).
 173     if (!m_frameCache) {
 174         m_frameCache.set(ImageBuffer::create(size(), false).release());
 175         if (!m_frameCache) // failed to allocate image
 176             return 0;
 177         renderSubtreeToImage(m_frameCache.get(), m_frame->contentRenderer());
 178     }
 179 #if PLATFORM(CG)
 180     return m_frameCache->cgImage();
 181 #elif PLATFORM(QT)
 182     return m_frameCache->pixmap();
 183 #elif PLATFORM(CAIRO)
 184     return m_frameCache->surface();
 185 #else
 186     notImplemented();
 187     return 0;
 188 #endif
 189 }
 190
 191 bool SVGImage::dataChanged(bool allDataReceived)
 192 {
 193     int length = m_data->size();
 194     if (!length) // if this was an empty image
 195         return true;
 196
 197     if (allDataReceived) {
 198         static ChromeClient* dummyChromeClient = new SVGEmptyChromeClient;
 199         static FrameLoaderClient* dummyFrameLoaderClient =  new SVGEmptyFrameLoaderClient;
 200         static EditorClient* dummyEditorClient = new SVGEmptyEditorClient;
 201         static ContextMenuClient* dummyContextMenuClient = new SVGEmptyContextMenuClient;
 202         static DragClient* dummyDragClient = new SVGEmptyDragClient;
 203         static InspectorClient* dummyInspectorClient = new SVGEmptyInspectorClient;
 204
 205         // FIXME: If this SVG ends up loading itself, we'll leak this Frame (and associated DOM & render trees).
 206         // The Cache code does not know about CachedImages holding Frames and won't know to break the cycle.
 207         m_page.set(new Page(dummyChromeClient, dummyContextMenuClient, dummyEditorClient, dummyDragClient, dummyInspectorClient));
 208         m_page->settings()->setJavaScriptEnabled(false);
 209
 210         m_frame = new Frame(m_page.get(), 0, dummyFrameLoaderClient);
 211         m_frameView = new FrameView(m_frame.get());
 212         m_frameView->deref(); // FIXME: FrameView starts with a refcount of 1
 213         m_frame->setView(m_frameView.get());
 214         m_frame->init();
 215         ResourceRequest fakeRequest(KURL(""));
 216         m_frame->loader()->load(fakeRequest); // Make sure the DocumentLoader is created
 217         m_frame->loader()->cancelContentPolicyCheck(); // cancel any policy checks
 218         m_frame->loader()->commitProvisionalLoad(0);
 219         m_frame->loader()->setResponseMIMEType("image/svg+xml");
 220         m_frame->loader()->begin(KURL()); // create the empty document
 221         m_frame->loader()->write(m_data->data(), m_data->size());
 222         m_frame->loader()->end();
 223         m_frameView->setTransparent(true); // SVG Images are transparent.
 224     }
 225     return m_frameView;
 226 }
 227
 228 }
 229
 230 #endif // ENABLE(SVG)