1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2000 Dirk Mueller (mueller@kde.org)
4 * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
5 * Copyright (C) Research In Motion Limited 2011-2012. All rights reserved.
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 * along 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
24#include "config.h"
25#include "core/rendering/RenderReplaced.h"
26
27#include "core/editing/PositionWithAffinity.h"
28#include "core/paint/BoxPainter.h"
29#include "core/rendering/GraphicsContextAnnotator.h"
30#include "core/rendering/RenderBlock.h"
31#include "core/rendering/RenderImage.h"
32#include "core/rendering/RenderLayer.h"
33#include "core/rendering/RenderView.h"
34#include "platform/LengthFunctions.h"
35#include "platform/graphics/GraphicsContext.h"
36
37namespace blink {
38
39const int RenderReplaced::defaultWidth = 300;
40const int RenderReplaced::defaultHeight = 150;
41
42RenderReplaced::RenderReplaced(Element* element)
43    : RenderBox(element)
44    , m_intrinsicSize(defaultWidth, defaultHeight)
45{
46    setReplaced(true);
47}
48
49RenderReplaced::RenderReplaced(Element* element, const LayoutSize& intrinsicSize)
50    : RenderBox(element)
51    , m_intrinsicSize(intrinsicSize)
52{
53    setReplaced(true);
54}
55
56RenderReplaced::~RenderReplaced()
57{
58}
59
60void RenderReplaced::willBeDestroyed()
61{
62    if (!documentBeingDestroyed() && parent())
63        parent()->dirtyLinesFromChangedChild(this);
64
65    RenderBox::willBeDestroyed();
66}
67
68void RenderReplaced::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
69{
70    RenderBox::styleDidChange(diff, oldStyle);
71
72    bool hadStyle = (oldStyle != 0);
73    float oldZoom = hadStyle ? oldStyle->effectiveZoom() : RenderStyle::initialZoom();
74    if (style() && style()->effectiveZoom() != oldZoom)
75        intrinsicSizeChanged();
76}
77
78void RenderReplaced::layout()
79{
80    ASSERT(needsLayout());
81
82    LayoutRect oldContentRect = replacedContentRect();
83
84    setHeight(minimumReplacedHeight());
85
86    updateLogicalWidth();
87    updateLogicalHeight();
88
89    m_overflow.clear();
90    addVisualEffectOverflow();
91    updateLayerTransformAfterLayout();
92    invalidateBackgroundObscurationStatus();
93
94    clearNeedsLayout();
95
96    if (replacedContentRect() != oldContentRect)
97        setShouldDoFullPaintInvalidation(true);
98}
99
100void RenderReplaced::intrinsicSizeChanged()
101{
102    int scaledWidth = static_cast<int>(defaultWidth * style()->effectiveZoom());
103    int scaledHeight = static_cast<int>(defaultHeight * style()->effectiveZoom());
104    m_intrinsicSize = IntSize(scaledWidth, scaledHeight);
105    setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
106}
107
108void RenderReplaced::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
109{
110    ANNOTATE_GRAPHICS_CONTEXT(paintInfo, this);
111
112    if (!shouldPaint(paintInfo, paintOffset))
113        return;
114
115    LayoutPoint adjustedPaintOffset = paintOffset + location();
116
117    if (hasBoxDecorationBackground() && (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection))
118        paintBoxDecorationBackground(paintInfo, adjustedPaintOffset);
119
120    if (paintInfo.phase == PaintPhaseMask) {
121        paintMask(paintInfo, adjustedPaintOffset);
122        return;
123    }
124
125    if (paintInfo.phase == PaintPhaseClippingMask && (!hasLayer() || !layer()->hasCompositedClippingMask()))
126        return;
127
128    LayoutRect paintRect = LayoutRect(adjustedPaintOffset, size());
129    if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth())
130        paintOutline(paintInfo, paintRect);
131
132    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && !canHaveChildren() && paintInfo.phase != PaintPhaseClippingMask)
133        return;
134
135    if (!paintInfo.shouldPaintWithinRoot(this))
136        return;
137
138    bool drawSelectionTint = selectionState() != SelectionNone && !document().printing();
139    if (paintInfo.phase == PaintPhaseSelection) {
140        if (selectionState() == SelectionNone)
141            return;
142        drawSelectionTint = false;
143    }
144
145    bool completelyClippedOut = false;
146    if (style()->hasBorderRadius()) {
147        LayoutRect borderRect = LayoutRect(adjustedPaintOffset, size());
148
149        if (borderRect.isEmpty())
150            completelyClippedOut = true;
151        else {
152            // Push a clip if we have a border radius, since we want to round the foreground content that gets painted.
153            paintInfo.context->save();
154            RoundedRect roundedInnerRect = style()->getRoundedInnerBorderFor(paintRect,
155                paddingTop() + borderTop(), paddingBottom() + borderBottom(), paddingLeft() + borderLeft(), paddingRight() + borderRight(), true, true);
156            BoxPainter::clipRoundedInnerRect(paintInfo.context, paintRect, roundedInnerRect);
157        }
158    }
159
160    if (!completelyClippedOut) {
161        if (paintInfo.phase == PaintPhaseClippingMask) {
162            paintClippingMask(paintInfo, adjustedPaintOffset);
163        } else {
164            paintReplaced(paintInfo, adjustedPaintOffset);
165        }
166
167        if (style()->hasBorderRadius())
168            paintInfo.context->restore();
169    }
170
171    // The selection tint never gets clipped by border-radius rounding, since we want it to run right up to the edges of
172    // surrounding content.
173    if (drawSelectionTint) {
174        LayoutRect selectionPaintingRect = localSelectionRect();
175        selectionPaintingRect.moveBy(adjustedPaintOffset);
176        paintInfo.context->fillRect(pixelSnappedIntRect(selectionPaintingRect), selectionBackgroundColor());
177    }
178}
179
180bool RenderReplaced::shouldPaint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
181{
182    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline
183        && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseMask && paintInfo.phase != PaintPhaseClippingMask)
184        return false;
185
186    if (!paintInfo.shouldPaintWithinRoot(this))
187        return false;
188
189    // if we're invisible or haven't received a layout yet, then just bail.
190    if (style()->visibility() != VISIBLE)
191        return false;
192
193    LayoutPoint adjustedPaintOffset = paintOffset + location();
194
195    // Early exit if the element touches the edges.
196    LayoutUnit top = adjustedPaintOffset.y() + visualOverflowRect().y();
197    LayoutUnit bottom = adjustedPaintOffset.y() + visualOverflowRect().maxY();
198    if (isSelected() && inlineBoxWrapper()) {
199        LayoutUnit selTop = paintOffset.y() + inlineBoxWrapper()->root().selectionTop();
200        LayoutUnit selBottom = paintOffset.y() + selTop + inlineBoxWrapper()->root().selectionHeight();
201        top = std::min(selTop, top);
202        bottom = std::max(selBottom, bottom);
203    }
204
205    if (adjustedPaintOffset.x() + visualOverflowRect().x() >= paintInfo.rect.maxX() || adjustedPaintOffset.x() + visualOverflowRect().maxX() <= paintInfo.rect.x())
206        return false;
207
208    if (top >= paintInfo.rect.maxY() || bottom <= paintInfo.rect.y())
209        return false;
210
211    return true;
212}
213
214bool RenderReplaced::hasReplacedLogicalHeight() const
215{
216    if (style()->logicalHeight().isAuto())
217        return false;
218
219    if (style()->logicalHeight().isSpecified()) {
220        if (hasAutoHeightOrContainingBlockWithAutoHeight())
221            return false;
222        return true;
223    }
224
225    if (style()->logicalHeight().isIntrinsic())
226        return true;
227
228    return false;
229}
230
231bool RenderReplaced::needsPreferredWidthsRecalculation() const
232{
233    // If the height is a percentage and the width is auto, then the containingBlocks's height changing can cause
234    // this node to change it's preferred width because it maintains aspect ratio.
235    return hasRelativeLogicalHeight() && style()->logicalWidth().isAuto() && !hasAutoHeightOrContainingBlockWithAutoHeight();
236}
237
238static inline bool rendererHasAspectRatio(const RenderObject* renderer)
239{
240    ASSERT(renderer);
241    return renderer->isImage() || renderer->isCanvas() || renderer->isVideo();
242}
243
244void RenderReplaced::computeAspectRatioInformationForRenderBox(RenderBox* contentRenderer, FloatSize& constrainedSize, double& intrinsicRatio) const
245{
246    FloatSize intrinsicSize;
247    if (contentRenderer) {
248        contentRenderer->computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio);
249
250        // Handle zoom & vertical writing modes here, as the embedded document doesn't know about them.
251        intrinsicSize.scale(style()->effectiveZoom());
252        if (isRenderImage())
253            intrinsicSize.scale(toRenderImage(this)->imageDevicePixelRatio());
254
255        // Update our intrinsic size to match what the content renderer has computed, so that when we
256        // constrain the size below, the correct intrinsic size will be obtained for comparison against
257        // min and max widths.
258        if (intrinsicRatio && !intrinsicSize.isEmpty())
259            m_intrinsicSize = LayoutSize(intrinsicSize);
260
261        if (!isHorizontalWritingMode()) {
262            if (intrinsicRatio)
263                intrinsicRatio = 1 / intrinsicRatio;
264            intrinsicSize = intrinsicSize.transposedSize();
265        }
266    } else {
267        computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio);
268        if (intrinsicRatio && !intrinsicSize.isEmpty())
269            m_intrinsicSize = LayoutSize(isHorizontalWritingMode() ? intrinsicSize : intrinsicSize.transposedSize());
270    }
271
272    // Now constrain the intrinsic size along each axis according to minimum and maximum width/heights along the
273    // opposite axis. So for example a maximum width that shrinks our width will result in the height we compute here
274    // having to shrink in order to preserve the aspect ratio. Because we compute these values independently along
275    // each axis, the final returned size may in fact not preserve the aspect ratio.
276    // FIXME: In the long term, it might be better to just return this code more to the way it used to be before this
277    // function was added, since all it has done is make the code more unclear.
278    constrainedSize = intrinsicSize;
279    if (intrinsicRatio && !intrinsicSize.isEmpty() && style()->logicalWidth().isAuto() && style()->logicalHeight().isAuto()) {
280        // We can't multiply or divide by 'intrinsicRatio' here, it breaks tests, like fast/images/zoomed-img-size.html, which
281        // can only be fixed once subpixel precision is available for things like intrinsicWidth/Height - which include zoom!
282        constrainedSize.setWidth(RenderBox::computeReplacedLogicalHeight() * intrinsicSize.width() / intrinsicSize.height());
283        constrainedSize.setHeight(RenderBox::computeReplacedLogicalWidth() * intrinsicSize.height() / intrinsicSize.width());
284    }
285}
286
287LayoutRect RenderReplaced::replacedContentRect(const LayoutSize* overriddenIntrinsicSize) const
288{
289    LayoutRect contentRect = contentBoxRect();
290    ObjectFit objectFit = style()->objectFit();
291
292    if (objectFit == ObjectFitFill && style()->objectPosition() == RenderStyle::initialObjectPosition()) {
293        return contentRect;
294    }
295
296    LayoutSize intrinsicSize = overriddenIntrinsicSize ? *overriddenIntrinsicSize : this->intrinsicSize();
297    if (!intrinsicSize.width() || !intrinsicSize.height())
298        return contentRect;
299
300    LayoutRect finalRect = contentRect;
301    switch (objectFit) {
302    case ObjectFitContain:
303    case ObjectFitScaleDown:
304    case ObjectFitCover:
305        finalRect.setSize(finalRect.size().fitToAspectRatio(intrinsicSize, objectFit == ObjectFitCover ? AspectRatioFitGrow : AspectRatioFitShrink));
306        if (objectFit != ObjectFitScaleDown || finalRect.width() <= intrinsicSize.width())
307            break;
308        // fall through
309    case ObjectFitNone:
310        finalRect.setSize(intrinsicSize);
311        break;
312    case ObjectFitFill:
313        break;
314    default:
315        ASSERT_NOT_REACHED();
316    }
317
318    LayoutUnit xOffset = minimumValueForLength(style()->objectPosition().x(), contentRect.width() - finalRect.width());
319    LayoutUnit yOffset = minimumValueForLength(style()->objectPosition().y(), contentRect.height() - finalRect.height());
320    finalRect.move(xOffset, yOffset);
321
322    return finalRect;
323}
324
325void RenderReplaced::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const
326{
327    // If there's an embeddedContentBox() of a remote, referenced document available, this code-path should never be used.
328    ASSERT(!embeddedContentBox());
329    intrinsicSize = FloatSize(intrinsicLogicalWidth().toFloat(), intrinsicLogicalHeight().toFloat());
330
331    // Figure out if we need to compute an intrinsic ratio.
332    if (intrinsicSize.isEmpty() || !rendererHasAspectRatio(this))
333        return;
334
335    intrinsicRatio = intrinsicSize.width() / intrinsicSize.height();
336}
337
338LayoutUnit RenderReplaced::computeReplacedLogicalWidth(ShouldComputePreferred shouldComputePreferred) const
339{
340    if (style()->logicalWidth().isSpecified() || style()->logicalWidth().isIntrinsic())
341        return computeReplacedLogicalWidthRespectingMinMaxWidth(computeReplacedLogicalWidthUsing(style()->logicalWidth()), shouldComputePreferred);
342
343    RenderBox* contentRenderer = embeddedContentBox();
344
345    // 10.3.2 Inline, replaced elements: http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width
346    double intrinsicRatio = 0;
347    FloatSize constrainedSize;
348    computeAspectRatioInformationForRenderBox(contentRenderer, constrainedSize, intrinsicRatio);
349
350    if (style()->logicalWidth().isAuto()) {
351        bool computedHeightIsAuto = hasAutoHeightOrContainingBlockWithAutoHeight();
352        bool hasIntrinsicWidth = constrainedSize.width() > 0;
353
354        // If 'height' and 'width' both have computed values of 'auto' and the element also has an intrinsic width, then that intrinsic width is the used value of 'width'.
355        if (computedHeightIsAuto && hasIntrinsicWidth)
356            return computeReplacedLogicalWidthRespectingMinMaxWidth(constrainedSize.width(), shouldComputePreferred);
357
358        bool hasIntrinsicHeight = constrainedSize.height() > 0;
359        if (intrinsicRatio) {
360            // If 'height' and 'width' both have computed values of 'auto' and the element has no intrinsic width, but does have an intrinsic height and intrinsic ratio;
361            // or if 'width' has a computed value of 'auto', 'height' has some other computed value, and the element does have an intrinsic ratio; then the used value
362            // of 'width' is: (used height) * (intrinsic ratio)
363            if (intrinsicRatio && ((computedHeightIsAuto && !hasIntrinsicWidth && hasIntrinsicHeight) || !computedHeightIsAuto)) {
364                LayoutUnit logicalHeight = computeReplacedLogicalHeight();
365                return computeReplacedLogicalWidthRespectingMinMaxWidth(roundToInt(round(logicalHeight * intrinsicRatio)), shouldComputePreferred);
366            }
367
368            // If 'height' and 'width' both have computed values of 'auto' and the element has an intrinsic ratio but no intrinsic height or width, then the used value of
369            // 'width' is undefined in CSS 2.1. However, it is suggested that, if the containing block's width does not itself depend on the replaced element's width, then
370            // the used value of 'width' is calculated from the constraint equation used for block-level, non-replaced elements in normal flow.
371            if (computedHeightIsAuto && !hasIntrinsicWidth && !hasIntrinsicHeight) {
372                if (shouldComputePreferred == ComputePreferred)
373                    return 0;
374                // The aforementioned 'constraint equation' used for block-level, non-replaced elements in normal flow:
375                // 'margin-left' + 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' + 'margin-right' = width of containing block
376                LayoutUnit logicalWidth = containingBlock()->availableLogicalWidth();
377
378                // This solves above equation for 'width' (== logicalWidth).
379                LayoutUnit marginStart = minimumValueForLength(style()->marginStart(), logicalWidth);
380                LayoutUnit marginEnd = minimumValueForLength(style()->marginEnd(), logicalWidth);
381                logicalWidth = std::max<LayoutUnit>(0, logicalWidth - (marginStart + marginEnd + (width() - clientWidth())));
382                return computeReplacedLogicalWidthRespectingMinMaxWidth(logicalWidth, shouldComputePreferred);
383            }
384        }
385
386        // Otherwise, if 'width' has a computed value of 'auto', and the element has an intrinsic width, then that intrinsic width is the used value of 'width'.
387        if (hasIntrinsicWidth)
388            return computeReplacedLogicalWidthRespectingMinMaxWidth(constrainedSize.width(), shouldComputePreferred);
389
390        // Otherwise, if 'width' has a computed value of 'auto', but none of the conditions above are met, then the used value of 'width' becomes 300px. If 300px is too
391        // wide to fit the device, UAs should use the width of the largest rectangle that has a 2:1 ratio and fits the device instead.
392        // Note: We fall through and instead return intrinsicLogicalWidth() here - to preserve existing WebKit behavior, which might or might not be correct, or desired.
393        // Changing this to return cDefaultWidth, will affect lots of test results. Eg. some tests assume that a blank <img> tag (which implies width/height=auto)
394        // has no intrinsic size, which is wrong per CSS 2.1, but matches our behavior since a long time.
395    }
396
397    return computeReplacedLogicalWidthRespectingMinMaxWidth(intrinsicLogicalWidth(), shouldComputePreferred);
398}
399
400LayoutUnit RenderReplaced::computeReplacedLogicalHeight() const
401{
402    // 10.5 Content height: the 'height' property: http://www.w3.org/TR/CSS21/visudet.html#propdef-height
403    if (hasReplacedLogicalHeight())
404        return computeReplacedLogicalHeightRespectingMinMaxHeight(computeReplacedLogicalHeightUsing(style()->logicalHeight()));
405
406    RenderBox* contentRenderer = embeddedContentBox();
407
408    // 10.6.2 Inline, replaced elements: http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-height
409    double intrinsicRatio = 0;
410    FloatSize constrainedSize;
411    computeAspectRatioInformationForRenderBox(contentRenderer, constrainedSize, intrinsicRatio);
412
413    bool widthIsAuto = style()->logicalWidth().isAuto();
414    bool hasIntrinsicHeight = constrainedSize.height() > 0;
415
416    // If 'height' and 'width' both have computed values of 'auto' and the element also has an intrinsic height, then that intrinsic height is the used value of 'height'.
417    if (widthIsAuto && hasIntrinsicHeight)
418        return computeReplacedLogicalHeightRespectingMinMaxHeight(constrainedSize.height());
419
420    // Otherwise, if 'height' has a computed value of 'auto', and the element has an intrinsic ratio then the used value of 'height' is:
421    // (used width) / (intrinsic ratio)
422    if (intrinsicRatio)
423        return computeReplacedLogicalHeightRespectingMinMaxHeight(roundToInt(round(availableLogicalWidth() / intrinsicRatio)));
424
425    // Otherwise, if 'height' has a computed value of 'auto', and the element has an intrinsic height, then that intrinsic height is the used value of 'height'.
426    if (hasIntrinsicHeight)
427        return computeReplacedLogicalHeightRespectingMinMaxHeight(constrainedSize.height());
428
429    // Otherwise, if 'height' has a computed value of 'auto', but none of the conditions above are met, then the used value of 'height' must be set to the height
430    // of the largest rectangle that has a 2:1 ratio, has a height not greater than 150px, and has a width not greater than the device width.
431    return computeReplacedLogicalHeightRespectingMinMaxHeight(intrinsicLogicalHeight());
432}
433
434void RenderReplaced::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
435{
436    minLogicalWidth = maxLogicalWidth = intrinsicLogicalWidth();
437}
438
439void RenderReplaced::computePreferredLogicalWidths()
440{
441    ASSERT(preferredLogicalWidthsDirty());
442
443    // We cannot resolve any percent logical width here as the available logical
444    // width may not be set on our containing block.
445    if (style()->logicalWidth().isPercent())
446        computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
447    else
448        m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = computeReplacedLogicalWidth(ComputePreferred);
449
450    RenderStyle* styleToUse = style();
451    if (styleToUse->logicalWidth().isPercent() || styleToUse->logicalMaxWidth().isPercent())
452        m_minPreferredLogicalWidth = 0;
453
454    if (styleToUse->logicalMinWidth().isFixed() && styleToUse->logicalMinWidth().value() > 0) {
455        m_maxPreferredLogicalWidth = std::max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMinWidth().value()));
456        m_minPreferredLogicalWidth = std::max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMinWidth().value()));
457    }
458
459    if (styleToUse->logicalMaxWidth().isFixed()) {
460        m_maxPreferredLogicalWidth = std::min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMaxWidth().value()));
461        m_minPreferredLogicalWidth = std::min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMaxWidth().value()));
462    }
463
464    LayoutUnit borderAndPadding = borderAndPaddingLogicalWidth();
465    m_minPreferredLogicalWidth += borderAndPadding;
466    m_maxPreferredLogicalWidth += borderAndPadding;
467
468    clearPreferredLogicalWidthsDirty();
469}
470
471PositionWithAffinity RenderReplaced::positionForPoint(const LayoutPoint& point)
472{
473    // FIXME: This code is buggy if the replaced element is relative positioned.
474    InlineBox* box = inlineBoxWrapper();
475    RootInlineBox* rootBox = box ? &box->root() : 0;
476
477    LayoutUnit top = rootBox ? rootBox->selectionTop() : logicalTop();
478    LayoutUnit bottom = rootBox ? rootBox->selectionBottom() : logicalBottom();
479
480    LayoutUnit blockDirectionPosition = isHorizontalWritingMode() ? point.y() + y() : point.x() + x();
481    LayoutUnit lineDirectionPosition = isHorizontalWritingMode() ? point.x() + x() : point.y() + y();
482
483    if (blockDirectionPosition < top)
484        return createPositionWithAffinity(caretMinOffset(), DOWNSTREAM); // coordinates are above
485
486    if (blockDirectionPosition >= bottom)
487        return createPositionWithAffinity(caretMaxOffset(), DOWNSTREAM); // coordinates are below
488
489    if (node()) {
490        if (lineDirectionPosition <= logicalLeft() + (logicalWidth() / 2))
491            return createPositionWithAffinity(0, DOWNSTREAM);
492        return createPositionWithAffinity(1, DOWNSTREAM);
493    }
494
495    return RenderBox::positionForPoint(point);
496}
497
498LayoutRect RenderReplaced::selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const
499{
500    ASSERT(!needsLayout());
501
502    if (!isSelected())
503        return LayoutRect();
504
505    LayoutRect rect = localSelectionRect();
506    mapRectToPaintInvalidationBacking(paintInvalidationContainer, rect, 0);
507    return rect;
508}
509
510LayoutRect RenderReplaced::localSelectionRect(bool checkWhetherSelected) const
511{
512    if (checkWhetherSelected && !isSelected())
513        return LayoutRect();
514
515    if (!inlineBoxWrapper())
516        // We're a block-level replaced element.  Just return our own dimensions.
517        return LayoutRect(LayoutPoint(), size());
518
519    RootInlineBox& root = inlineBoxWrapper()->root();
520    LayoutUnit newLogicalTop = root.block().style()->isFlippedBlocksWritingMode() ? inlineBoxWrapper()->logicalBottom() - root.selectionBottom() : root.selectionTop() - inlineBoxWrapper()->logicalTop();
521    if (root.block().style()->isHorizontalWritingMode())
522        return LayoutRect(0, newLogicalTop, width(), root.selectionHeight());
523    return LayoutRect(newLogicalTop, 0, root.selectionHeight(), height());
524}
525
526void RenderReplaced::setSelectionState(SelectionState state)
527{
528    // The selection state for our containing block hierarchy is updated by the base class call.
529    RenderBox::setSelectionState(state);
530
531    if (!inlineBoxWrapper())
532        return;
533
534    // We only include the space below the baseline in our layer's cached paint invalidation rect if the
535    // image is selected. Since the selection state has changed update the rect.
536    if (hasLayer())
537        setPreviousPaintInvalidationRect(boundsRectForPaintInvalidation(containerForPaintInvalidation()));
538
539    if (canUpdateSelectionOnRootLineBoxes())
540        inlineBoxWrapper()->root().setHasSelectedChildren(isSelected());
541}
542
543bool RenderReplaced::isSelected() const
544{
545    SelectionState s = selectionState();
546    if (s == SelectionNone)
547        return false;
548    if (s == SelectionInside)
549        return true;
550
551    int selectionStart, selectionEnd;
552    selectionStartEnd(selectionStart, selectionEnd);
553    if (s == SelectionStart)
554        return selectionStart == 0;
555
556    int end = node()->hasChildren() ? node()->countChildren() : 1;
557    if (s == SelectionEnd)
558        return selectionEnd == end;
559    if (s == SelectionBoth)
560        return selectionStart == 0 && selectionEnd == end;
561
562    ASSERT(0);
563    return false;
564}
565LayoutRect RenderReplaced::clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState) const
566{
567    if (style()->visibility() != VISIBLE && !enclosingLayer()->hasVisibleContent())
568        return LayoutRect();
569
570    // The selectionRect can project outside of the overflowRect, so take their union
571    // for paint invalidation to avoid selection painting glitches.
572    LayoutRect r = isSelected() ? localSelectionRect() : visualOverflowRect();
573    mapRectToPaintInvalidationBacking(paintInvalidationContainer, r, paintInvalidationState);
574    return r;
575}
576
577}
578