1 /*

     2     Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>

     3                   2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>

     4                   2007 Eric Seidel <eric@webkit.org>

     5                   2009 Google, Inc.

     6 

     7     This library is free software; you can redistribute it and/or

     8     modify it under the terms of the GNU Library General Public

     9     License as published by the Free Software Foundation; either

    10     version 2 of the License, or (at your option) any later version.

    11 

    12     This library is distributed in the hope that it will be useful,

    13     but WITHOUT ANY WARRANTY; without even the implied warranty of

    14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    15     Library General Public License for more details.

    16 

    17     You should have received a copy of the GNU Library General Public License

    18     aint with this library; see the file COPYING.LIB.  If not, write to

    19     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    20     Boston, MA 02110-1301, USA.

    21 */

    22 

    23 #include "config.h"

    24 

    25 #if ENABLE(SVG)

    26 #include "RenderSVGRoot.h"

    27 

    28 #include "GraphicsContext.h"

    29 #include "HitTestResult.h"

    30 #include "RenderSVGContainer.h"

    31 #include "RenderSVGResource.h"

    32 #include "RenderView.h"

    33 #include "SVGLength.h"

    34 #include "SVGRenderSupport.h"

    35 #include "SVGSVGElement.h"

    36 #include "SVGStyledElement.h"

    37 #include "TransformState.h"

    38 

    39 #if ENABLE(FILTERS)

    40 #include "RenderSVGResourceFilter.h"

    41 #endif

    42 

    43 using namespace std;

    44 

    45 namespace WebCore {

    46 

    47 RenderSVGRoot::RenderSVGRoot(SVGStyledElement* node)

    48     : RenderBox(node)

    49     , m_isLayoutSizeChanged(false)

    50 {

    51     setReplaced(true);

    52 }

    53 

    54 int RenderSVGRoot::lineHeight(bool, bool) const

    55 {

    56     return height() + marginTop() + marginBottom();

    57 }

    58 

    59 int RenderSVGRoot::baselinePosition(bool, bool) const

    60 {

    61     return height() + marginTop() + marginBottom();

    62 }

    63 

    64 void RenderSVGRoot::calcPrefWidths()

    65 {

    66     ASSERT(prefWidthsDirty());

    67 

    68     int borderAndPadding = borderAndPaddingWidth();

    69     int width = calcReplacedWidth(false) + borderAndPadding;

    70 

    71     if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength)

    72         width = min(width, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? borderAndPadding : 0));

    73 

    74     if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent())) {

    75         m_minPrefWidth = 0;

    76         m_maxPrefWidth = width;

    77     } else

    78         m_minPrefWidth = m_maxPrefWidth = width;

    79 

    80     setPrefWidthsDirty(false);

    81 }

    82 

    83 int RenderSVGRoot::calcReplacedWidth(bool includeMaxWidth) const

    84 {

    85     int replacedWidth = RenderBox::calcReplacedWidth(includeMaxWidth);

    86     if (!style()->width().isPercent())

    87         return replacedWidth;

    88 

    89     // FIXME: Investigate in size rounding issues

    90     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

    91     return static_cast<int>(roundf(replacedWidth * svg->currentScale()));

    92 }

    93 

    94 int RenderSVGRoot::calcReplacedHeight() const

    95 {

    96     int replacedHeight = RenderBox::calcReplacedHeight();

    97     if (!style()->height().isPercent())

    98         return replacedHeight;

    99 

   100     // FIXME: Investigate in size rounding issues

   101     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

   102     return static_cast<int>(roundf(replacedHeight * svg->currentScale()));

   103 }

   104 

   105 void RenderSVGRoot::layout()

   106 {

   107     ASSERT(needsLayout());

   108 

   109     // Arbitrary affine transforms are incompatible with LayoutState.

   110     view()->disableLayoutState();

   111 

   112     bool needsLayout = selfNeedsLayout();

   113     LayoutRepainter repainter(*this, needsLayout && m_everHadLayout && checkForRepaintDuringLayout());

   114 

   115     IntSize oldSize(width(), height());

   116     calcWidth();

   117     calcHeight();

   118     calcViewport();

   119 

   120     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

   121     m_isLayoutSizeChanged = svg->hasRelativeLengths() && oldSize != size();

   122 

   123     SVGRenderSupport::layoutChildren(this, needsLayout);

   124     m_isLayoutSizeChanged = false;

   125 

   126     repainter.repaintAfterLayout();

   127 

   128     view()->enableLayoutState();

   129     setNeedsLayout(false);

   130 }

   131 

   132 bool RenderSVGRoot::selfWillPaint() const

   133 {

   134 #if ENABLE(FILTERS)

   135     const SVGRenderStyle* svgStyle = style()->svgStyle();

   136     RenderSVGResourceFilter* filter = getRenderSVGResourceById<RenderSVGResourceFilter>(document(), svgStyle->filterResource());

   137     if (filter)

   138         return true;

   139 #endif

   140     return false;

   141 }

   142 

   143 void RenderSVGRoot::paint(PaintInfo& paintInfo, int parentX, int parentY)

   144 {

   145     if (paintInfo.context->paintingDisabled())

   146         return;

   147 

   148     bool isVisible = style()->visibility() == VISIBLE;

   149     IntPoint parentOriginInContainer(parentX, parentY);

   150     IntPoint borderBoxOriginInContainer = parentOriginInContainer + parentOriginToBorderBox();

   151 

   152     if (hasBoxDecorations() && (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseChildBlockBackground) && isVisible)

   153         paintBoxDecorations(paintInfo, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y());

   154 

   155     if (paintInfo.phase == PaintPhaseBlockBackground)

   156         return;

   157 

   158     // An empty viewport disables rendering.  FIXME: Should we still render filters?

   159     if (m_viewportSize.isEmpty())

   160         return;

   161 

   162     // Don't paint if we don't have kids, except if we have filters we should paint those.

   163     if (!firstChild() && !selfWillPaint())

   164         return;

   165 

   166     // Make a copy of the PaintInfo because applyTransform will modify the damage rect.

   167     PaintInfo childPaintInfo(paintInfo);

   168     childPaintInfo.context->save();

   169 

   170     // Apply initial viewport clip - not affected by overflow handling

   171     childPaintInfo.context->clip(overflowClipRect(borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y()));

   172 

   173     // Convert from container offsets (html renderers) to a relative transform (svg renderers).

   174     // Transform from our paint container's coordinate system to our local coords.

   175     childPaintInfo.applyTransform(localToRepaintContainerTransform(parentOriginInContainer));

   176 

   177     bool continueRendering = true;

   178     if (childPaintInfo.phase == PaintPhaseForeground)

   179         continueRendering = SVGRenderSupport::prepareToRenderSVGContent(this, childPaintInfo);

   180 

   181     if (continueRendering)

   182         RenderBox::paint(childPaintInfo, 0, 0);

   183 

   184     if (childPaintInfo.phase == PaintPhaseForeground)

   185         SVGRenderSupport::finishRenderSVGContent(this, childPaintInfo, paintInfo.context);

   186 

   187     childPaintInfo.context->restore();

   188 

   189     if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && isVisible)

   190         paintOutline(paintInfo.context, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y(), width(), height());

   191 }

   192 

   193 void RenderSVGRoot::destroy()

   194 {

   195     RenderSVGResource::invalidateAllResourcesOfRenderer(this);

   196     RenderBox::destroy();

   197 }

   198 

   199 void RenderSVGRoot::calcViewport()

   200 {

   201     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

   202 

   203     if (!svg->hasSetContainerSize()) {

   204         // In the normal case of <svg> being stand-alone or in a CSSBoxModel object we use

   205         // RenderBox::width()/height() (which pulls data from RenderStyle)

   206         m_viewportSize = FloatSize(width(), height());

   207         return;

   208     }

   209 

   210     // In the SVGImage case grab the SVGLength values off of SVGSVGElement and use

   211     // the special relativeWidthValue accessors which respect the specified containerSize

   212     // FIXME: Check how SVGImage + zooming is supposed to be handled?

   213     SVGLength width = svg->width();

   214     SVGLength height = svg->height();

   215     m_viewportSize = FloatSize(width.unitType() == LengthTypePercentage ? svg->relativeWidthValue() : width.value(svg),

   216                                height.unitType() == LengthTypePercentage ? svg->relativeHeightValue() : height.value(svg));

   217 }

   218 

   219 // RenderBox methods will expect coordinates w/o any transforms in coordinates

   220 // relative to our borderBox origin.  This method gives us exactly that.

   221 AffineTransform RenderSVGRoot::localToBorderBoxTransform() const

   222 {

   223     IntSize borderAndPadding = borderOriginToContentBox();

   224     SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

   225     float scale = svg->currentScale();

   226     FloatPoint translate = svg->currentTranslate();

   227     AffineTransform ctm(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y());

   228     return svg->viewBoxToViewTransform(width() / scale, height() / scale) * ctm;

   229 }

   230 

   231 IntSize RenderSVGRoot::parentOriginToBorderBox() const

   232 {

   233     return IntSize(x(), y());

   234 }

   235 

   236 IntSize RenderSVGRoot::borderOriginToContentBox() const

   237 {

   238     return IntSize(borderLeft() + paddingLeft(), borderTop() + paddingTop());

   239 }

   240 

   241 AffineTransform RenderSVGRoot::localToRepaintContainerTransform(const IntPoint& parentOriginInContainer) const

   242 {

   243     AffineTransform parentToContainer(localToParentTransform());

   244     return parentToContainer.translateRight(parentOriginInContainer.x(), parentOriginInContainer.y());

   245 }

   246 

   247 const AffineTransform& RenderSVGRoot::localToParentTransform() const

   248 {

   249     IntSize parentToBorderBoxOffset = parentOriginToBorderBox();

   250 

   251     AffineTransform borderBoxOriginToParentOrigin(localToBorderBoxTransform());

   252     borderBoxOriginToParentOrigin.translateRight(parentToBorderBoxOffset.width(), parentToBorderBoxOffset.height());

   253 

   254     m_localToParentTransform = borderBoxOriginToParentOrigin;

   255     return m_localToParentTransform;

   256 }

   257 

   258 FloatRect RenderSVGRoot::objectBoundingBox() const

   259 {

   260     return SVGRenderSupport::computeContainerBoundingBox(this, SVGRenderSupport::ObjectBoundingBox);

   261 }

   262 

   263 FloatRect RenderSVGRoot::strokeBoundingBox() const

   264 {

   265     return SVGRenderSupport::computeContainerBoundingBox(this, SVGRenderSupport::StrokeBoundingBox);

   266 }

   267 

   268 FloatRect RenderSVGRoot::repaintRectInLocalCoordinates() const

   269 {

   270     FloatRect repaintRect = SVGRenderSupport::computeContainerBoundingBox(this, SVGRenderSupport::RepaintBoundingBox);

   271     style()->svgStyle()->inflateForShadow(repaintRect);

   272     repaintRect.inflate(borderAndPaddingWidth());

   273     return repaintRect;

   274 }

   275 

   276 IntRect RenderSVGRoot::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)

   277 {

   278     return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer);

   279 }

   280 

   281 void RenderSVGRoot::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& repaintRect, bool fixed)

   282 {

   283     // Apply our local transforms (except for x/y translation), then our shadow, 

   284     // and then call RenderBox's method to handle all the normal CSS Box model bits

   285     repaintRect = localToBorderBoxTransform().mapRect(repaintRect);

   286 

   287     // Apply initial viewport clip - not affected by overflow settings    

   288     repaintRect.intersect(enclosingIntRect(FloatRect(FloatPoint(), m_viewportSize)));

   289 

   290     style()->svgStyle()->inflateForShadow(repaintRect);

   291     RenderBox::computeRectForRepaint(repaintContainer, repaintRect, fixed);

   292 }

   293 

   294 void RenderSVGRoot::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed , bool useTransforms, TransformState& transformState) const

   295 {

   296     ASSERT(!fixed); // We should have no fixed content in the SVG rendering tree.

   297     ASSERT(useTransforms); // mapping a point through SVG w/o respecting trasnforms is useless.

   298 

   299     // Transform to our border box and let RenderBox transform the rest of the way.

   300     transformState.applyTransform(localToBorderBoxTransform());

   301     RenderBox::mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);

   302 }

   303 

   304 bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction)

   305 {

   306     IntPoint pointInContainer(_x, _y);

   307     IntSize containerToParentOffset(_tx, _ty);

   308 

   309     IntPoint pointInParent = pointInContainer - containerToParentOffset;

   310     IntPoint pointInBorderBox = pointInParent - parentOriginToBorderBox();

   311 

   312     // Note: For now, we're ignoring hits to border and padding for <svg>

   313     IntPoint pointInContentBox = pointInBorderBox - borderOriginToContentBox();

   314     if (!contentBoxRect().contains(pointInContentBox))

   315         return false;

   316 

   317     IntPoint localPoint = localToParentTransform().inverse().mapPoint(pointInParent);

   318 

   319     for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {

   320         if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {

   321             // FIXME: CSS/HTML assumes the local point is relative to the border box, right?

   322             updateHitTestResult(result, pointInBorderBox);

   323             // FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.

   324             result.addNodeToRectBasedTestResult(child->node(), _x, _y);

   325             return true;

   326         }

   327     }

   328 

   329     // Spec: Only graphical elements can be targeted by the mouse, so we don't check self here.

   330     // 16.4: "If there are no graphics elements whose relevant graphics content is under the pointer (i.e., there is no target element), the event is not dispatched."

   331     return false;

   332 }

   333 

   334 }

   335 

   336 #endif // ENABLE(SVG)