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1 /*
2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
4  *           (C) 2000 Dirk Mueller (mueller@kde.org)
5  *           (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
6  *           (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
7  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
8  * Copyright (C) 2010 Google Inc. All rights reserved.
9  *
10  * This library is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Library General Public
12  * License as published by the Free Software Foundation; either
13  * version 2 of the License, or (at your option) any later version.
14  *
15  * This library is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * Library General Public License for more details.
19  *
20  * You should have received a copy of the GNU Library General Public License
21  * along with this library; see the file COPYING.LIB.  If not, write to
22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23  * Boston, MA 02110-1301, USA.
24  *
25  */
26 
27 #include "config.h"
28 #include "RenderImage.h"
29 
30 #include "Frame.h"
31 #include "GraphicsContext.h"
32 #include "HTMLAreaElement.h"
33 #include "HTMLImageElement.h"
34 #include "HTMLInputElement.h"
35 #include "HTMLMapElement.h"
36 #include "HTMLNames.h"
37 #include "HitTestResult.h"
38 #include "Page.h"
39 #include "RenderLayer.h"
40 #include "RenderView.h"
41 #include "SelectionController.h"
42 #include "TextRun.h"
43 #include <wtf/UnusedParam.h>
44 
45 #ifdef ANDROID_LAYOUT
46 #include "Settings.h"
47 #endif
48 
49 #if ENABLE(WML)
50 #include "WMLImageElement.h"
51 #include "WMLNames.h"
52 #endif
53 
54 using namespace std;
55 
56 namespace WebCore {
57 
58 using namespace HTMLNames;
59 
RenderImage(Node * node)60 RenderImage::RenderImage(Node* node)
61     : RenderReplaced(node, IntSize(0, 0))
62     , m_needsToSetSizeForAltText(false)
63 {
64     updateAltText();
65 
66     view()->frameView()->setIsVisuallyNonEmpty();
67 }
68 
~RenderImage()69 RenderImage::~RenderImage()
70 {
71     ASSERT(m_imageResource);
72     m_imageResource->shutdown();
73 }
74 
setImageResource(PassOwnPtr<RenderImageResource> imageResource)75 void RenderImage::setImageResource(PassOwnPtr<RenderImageResource> imageResource)
76 {
77     ASSERT(!m_imageResource);
78     m_imageResource = imageResource;
79     m_imageResource->initialize(this);
80 }
81 
82 // If we'll be displaying either alt text or an image, add some padding.
83 static const unsigned short paddingWidth = 4;
84 static const unsigned short paddingHeight = 4;
85 
86 // Alt text is restricted to this maximum size, in pixels.  These are
87 // signed integers because they are compared with other signed values.
88 static const float maxAltTextWidth = 1024;
89 static const int maxAltTextHeight = 256;
90 
imageSizeForError(CachedImage * newImage) const91 IntSize RenderImage::imageSizeForError(CachedImage* newImage) const
92 {
93     ASSERT_ARG(newImage, newImage);
94     ASSERT_ARG(newImage, newImage->image());
95 
96     // imageSize() returns 0 for the error image. We need the true size of the
97     // error image, so we have to get it by grabbing image() directly.
98     return IntSize(paddingWidth + newImage->image()->width() * style()->effectiveZoom(), paddingHeight + newImage->image()->height() * style()->effectiveZoom());
99 }
100 
101 // Sets the image height and width to fit the alt text.  Returns true if the
102 // image size changed.
setImageSizeForAltText(CachedImage * newImage)103 bool RenderImage::setImageSizeForAltText(CachedImage* newImage /* = 0 */)
104 {
105     IntSize imageSize;
106     if (newImage && newImage->image())
107         imageSize = imageSizeForError(newImage);
108     else if (!m_altText.isEmpty() || newImage) {
109         // If we'll be displaying either text or an image, add a little padding.
110         imageSize = IntSize(paddingWidth, paddingHeight);
111     }
112 
113     // we have an alt and the user meant it (its not a text we invented)
114     if (!m_altText.isEmpty()) {
115         const Font& font = style()->font();
116         IntSize textSize(min(font.width(TextRun(m_altText.characters(), m_altText.length())), maxAltTextWidth), min(font.fontMetrics().height(), maxAltTextHeight));
117         imageSize = imageSize.expandedTo(textSize);
118     }
119 
120     if (imageSize == intrinsicSize())
121         return false;
122 
123     setIntrinsicSize(imageSize);
124     return true;
125 }
126 
styleDidChange(StyleDifference diff,const RenderStyle * oldStyle)127 void RenderImage::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
128 {
129     RenderReplaced::styleDidChange(diff, oldStyle);
130     if (m_needsToSetSizeForAltText) {
131         if (!m_altText.isEmpty() && setImageSizeForAltText(m_imageResource->cachedImage()))
132             imageDimensionsChanged(true /* imageSizeChanged */);
133         m_needsToSetSizeForAltText = false;
134     }
135 }
136 
imageChanged(WrappedImagePtr newImage,const IntRect * rect)137 void RenderImage::imageChanged(WrappedImagePtr newImage, const IntRect* rect)
138 {
139     if (documentBeingDestroyed())
140         return;
141 
142     if (hasBoxDecorations() || hasMask())
143         RenderReplaced::imageChanged(newImage, rect);
144 
145     if (!m_imageResource)
146         return;
147 
148     if (newImage != m_imageResource->imagePtr() || !newImage)
149         return;
150 
151     bool imageSizeChanged = false;
152 
153     // Set image dimensions, taking into account the size of the alt text.
154     if (m_imageResource->errorOccurred()) {
155         if (!m_altText.isEmpty() && document()->isPendingStyleRecalc()) {
156             ASSERT(node());
157             if (node()) {
158                 m_needsToSetSizeForAltText = true;
159                 node()->setNeedsStyleRecalc(SyntheticStyleChange);
160             }
161             return;
162         }
163         imageSizeChanged = setImageSizeForAltText(m_imageResource->cachedImage());
164     }
165 
166     imageDimensionsChanged(imageSizeChanged, rect);
167 }
168 
imageDimensionsChanged(bool imageSizeChanged,const IntRect * rect)169 void RenderImage::imageDimensionsChanged(bool imageSizeChanged, const IntRect* rect)
170 {
171     bool shouldRepaint = true;
172 
173     if (m_imageResource->imageSize(style()->effectiveZoom()) != intrinsicSize() || imageSizeChanged) {
174         if (!m_imageResource->errorOccurred())
175             setIntrinsicSize(m_imageResource->imageSize(style()->effectiveZoom()));
176 
177         // In the case of generated image content using :before/:after, we might not be in the
178         // render tree yet.  In that case, we don't need to worry about check for layout, since we'll get a
179         // layout when we get added in to the render tree hierarchy later.
180         if (containingBlock()) {
181             // lets see if we need to relayout at all..
182             int oldwidth = width();
183             int oldheight = height();
184             if (!preferredLogicalWidthsDirty())
185                 setPreferredLogicalWidthsDirty(true);
186             computeLogicalWidth();
187             computeLogicalHeight();
188 
189             if (imageSizeChanged || width() != oldwidth || height() != oldheight) {
190                 shouldRepaint = false;
191                 if (!selfNeedsLayout())
192                     setNeedsLayout(true);
193             }
194 
195             setWidth(oldwidth);
196             setHeight(oldheight);
197         }
198     }
199 
200     if (shouldRepaint) {
201         IntRect repaintRect;
202         if (rect) {
203             // The image changed rect is in source image coordinates (pre-zooming),
204             // so map from the bounds of the image to the contentsBox.
205             repaintRect = enclosingIntRect(mapRect(*rect, FloatRect(FloatPoint(), m_imageResource->imageSize(1.0f)), contentBoxRect()));
206             // Guard against too-large changed rects.
207             repaintRect.intersect(contentBoxRect());
208         } else
209             repaintRect = contentBoxRect();
210 
211         repaintRectangle(repaintRect);
212 
213 #if USE(ACCELERATED_COMPOSITING)
214         if (hasLayer()) {
215             // Tell any potential compositing layers that the image needs updating.
216             layer()->contentChanged(RenderLayer::ImageChanged);
217         }
218 #endif
219     }
220 }
221 
notifyFinished(CachedResource * newImage)222 void RenderImage::notifyFinished(CachedResource* newImage)
223 {
224     if (!m_imageResource)
225         return;
226 
227     if (documentBeingDestroyed())
228         return;
229 
230 #if USE(ACCELERATED_COMPOSITING)
231     if (newImage == m_imageResource->cachedImage() && hasLayer()) {
232         // tell any potential compositing layers
233         // that the image is done and they can reference it directly.
234         layer()->contentChanged(RenderLayer::ImageChanged);
235     }
236 #else
237     UNUSED_PARAM(newImage);
238 #endif
239 }
240 
paintReplaced(PaintInfo & paintInfo,int tx,int ty)241 void RenderImage::paintReplaced(PaintInfo& paintInfo, int tx, int ty)
242 {
243     int cWidth = contentWidth();
244     int cHeight = contentHeight();
245     int leftBorder = borderLeft();
246     int topBorder = borderTop();
247     int leftPad = paddingLeft();
248     int topPad = paddingTop();
249 
250     GraphicsContext* context = paintInfo.context;
251 
252     if (!m_imageResource->hasImage() || m_imageResource->errorOccurred()) {
253         if (paintInfo.phase == PaintPhaseSelection)
254             return;
255 
256         if (cWidth > 2 && cHeight > 2) {
257             // Draw an outline rect where the image should be.
258 #ifdef ANDROID_FIX // see http://b/issue?id=2052757
259             context->save();
260 #endif
261             context->setStrokeStyle(SolidStroke);
262             context->setStrokeColor(Color::lightGray, style()->colorSpace());
263             context->setFillColor(Color::transparent, style()->colorSpace());
264             context->drawRect(IntRect(tx + leftBorder + leftPad, ty + topBorder + topPad, cWidth, cHeight));
265 #ifdef ANDROID_FIX // see http://b/issue?id=2052757
266             context->restore();
267 #endif
268 
269             bool errorPictureDrawn = false;
270             int imageX = 0;
271             int imageY = 0;
272             // When calculating the usable dimensions, exclude the pixels of
273             // the ouline rect so the error image/alt text doesn't draw on it.
274             int usableWidth = cWidth - 2;
275             int usableHeight = cHeight - 2;
276 
277             RefPtr<Image> image = m_imageResource->image();
278 
279             if (m_imageResource->errorOccurred() && !image->isNull() && usableWidth >= image->width() && usableHeight >= image->height()) {
280                 // Center the error image, accounting for border and padding.
281                 int centerX = (usableWidth - image->width()) / 2;
282                 if (centerX < 0)
283                     centerX = 0;
284                 int centerY = (usableHeight - image->height()) / 2;
285                 if (centerY < 0)
286                     centerY = 0;
287                 imageX = leftBorder + leftPad + centerX + 1;
288                 imageY = topBorder + topPad + centerY + 1;
289                 context->drawImage(image.get(), style()->colorSpace(), IntPoint(tx + imageX, ty + imageY));
290                 errorPictureDrawn = true;
291             }
292 
293             if (!m_altText.isEmpty()) {
294                 String text = document()->displayStringModifiedByEncoding(m_altText);
295                 context->setFillColor(style()->visitedDependentColor(CSSPropertyColor), style()->colorSpace());
296                 int ax = tx + leftBorder + leftPad;
297                 int ay = ty + topBorder + topPad;
298                 const Font& font = style()->font();
299                 const FontMetrics& fontMetrics = font.fontMetrics();
300                 int ascent = fontMetrics.ascent();
301 
302                 // Only draw the alt text if it'll fit within the content box,
303                 // and only if it fits above the error image.
304                 TextRun textRun(text.characters(), text.length());
305                 int textWidth = font.width(textRun);
306                 if (errorPictureDrawn) {
307                     if (usableWidth >= textWidth && fontMetrics.height() <= imageY)
308                         context->drawText(font, textRun, IntPoint(ax, ay + ascent));
309                 } else if (usableWidth >= textWidth && cHeight >= fontMetrics.height())
310                     context->drawText(font, textRun, IntPoint(ax, ay + ascent));
311             }
312         }
313     } else if (m_imageResource->hasImage() && cWidth > 0 && cHeight > 0) {
314         RefPtr<Image> img = m_imageResource->image(cWidth, cHeight);
315         if (!img || img->isNull())
316             return;
317 
318 #if PLATFORM(MAC)
319         if (style()->highlight() != nullAtom && !paintInfo.context->paintingDisabled())
320             paintCustomHighlight(tx - x(), ty - y(), style()->highlight(), true);
321 #endif
322 
323         IntSize contentSize(cWidth, cHeight);
324         IntRect rect(IntPoint(tx + leftBorder + leftPad, ty + topBorder + topPad), contentSize);
325         paintIntoRect(context, rect);
326     }
327 }
328 
paint(PaintInfo & paintInfo,int tx,int ty)329 void RenderImage::paint(PaintInfo& paintInfo, int tx, int ty)
330 {
331     RenderReplaced::paint(paintInfo, tx, ty);
332 
333     if (paintInfo.phase == PaintPhaseOutline)
334         paintAreaElementFocusRing(paintInfo);
335 }
336 
paintAreaElementFocusRing(PaintInfo & paintInfo)337 void RenderImage::paintAreaElementFocusRing(PaintInfo& paintInfo)
338 {
339     Document* document = this->document();
340 
341     if (document->printing() || !document->frame()->selection()->isFocusedAndActive())
342         return;
343 
344     if (paintInfo.context->paintingDisabled() && !paintInfo.context->updatingControlTints())
345         return;
346 
347     Node* focusedNode = document->focusedNode();
348     if (!focusedNode || !focusedNode->hasTagName(areaTag))
349         return;
350 
351     HTMLAreaElement* areaElement = static_cast<HTMLAreaElement*>(focusedNode);
352     if (areaElement->imageElement() != node())
353         return;
354 
355     // Even if the theme handles focus ring drawing for entire elements, it won't do it for
356     // an area within an image, so we don't call RenderTheme::supportsFocusRing here.
357 
358     Path path = areaElement->computePath(this);
359     if (path.isEmpty())
360         return;
361 
362     // FIXME: Do we need additional code to clip the path to the image's bounding box?
363 
364     RenderStyle* areaElementStyle = areaElement->computedStyle();
365     unsigned short outlineWidth = areaElementStyle->outlineWidth();
366     if (!outlineWidth)
367         return;
368 
369     paintInfo.context->drawFocusRing(path, outlineWidth,
370         areaElementStyle->outlineOffset(),
371         areaElementStyle->visitedDependentColor(CSSPropertyOutlineColor));
372 }
373 
areaElementFocusChanged(HTMLAreaElement * element)374 void RenderImage::areaElementFocusChanged(HTMLAreaElement* element)
375 {
376     ASSERT_UNUSED(element, element->imageElement() == node());
377 
378     // It would be more efficient to only repaint the focus ring rectangle
379     // for the passed-in area element. That would require adding functions
380     // to the area element class.
381     repaint();
382 }
383 
paintIntoRect(GraphicsContext * context,const IntRect & rect)384 void RenderImage::paintIntoRect(GraphicsContext* context, const IntRect& rect)
385 {
386     if (!m_imageResource->hasImage() || m_imageResource->errorOccurred() || rect.width() <= 0 || rect.height() <= 0)
387         return;
388 
389     RefPtr<Image> img = m_imageResource->image(rect.width(), rect.height());
390     if (!img || img->isNull())
391         return;
392 
393     HTMLImageElement* imageElt = (node() && node()->hasTagName(imgTag)) ? static_cast<HTMLImageElement*>(node()) : 0;
394     CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
395     Image* image = m_imageResource->image().get();
396     bool useLowQualityScaling = shouldPaintAtLowQuality(context, image, image, rect.size());
397     context->drawImage(m_imageResource->image(rect.width(), rect.height()).get(), style()->colorSpace(), rect, compositeOperator, useLowQualityScaling);
398 }
399 
minimumReplacedHeight() const400 int RenderImage::minimumReplacedHeight() const
401 {
402     return m_imageResource->errorOccurred() ? intrinsicSize().height() : 0;
403 }
404 
imageMap() const405 HTMLMapElement* RenderImage::imageMap() const
406 {
407     HTMLImageElement* i = node() && node()->hasTagName(imgTag) ? static_cast<HTMLImageElement*>(node()) : 0;
408     return i ? i->document()->getImageMap(i->fastGetAttribute(usemapAttr)) : 0;
409 }
410 
nodeAtPoint(const HitTestRequest & request,HitTestResult & result,int x,int y,int tx,int ty,HitTestAction hitTestAction)411 bool RenderImage::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)
412 {
413     HitTestResult tempResult(result.point(), result.topPadding(), result.rightPadding(), result.bottomPadding(), result.leftPadding());
414     bool inside = RenderReplaced::nodeAtPoint(request, tempResult, x, y, tx, ty, hitTestAction);
415 
416     if (tempResult.innerNode() && node()) {
417         if (HTMLMapElement* map = imageMap()) {
418             IntRect contentBox = contentBoxRect();
419             float zoom = style()->effectiveZoom();
420             int mapX = lroundf((x - tx - this->x() - contentBox.x()) / zoom);
421             int mapY = lroundf((y - ty - this->y() - contentBox.y()) / zoom);
422             if (map->mapMouseEvent(mapX, mapY, contentBox.size(), tempResult))
423                 tempResult.setInnerNonSharedNode(node());
424         }
425     }
426 
427     if (!inside && result.isRectBasedTest())
428         result.append(tempResult);
429     if (inside)
430         result = tempResult;
431     return inside;
432 }
433 
updateAltText()434 void RenderImage::updateAltText()
435 {
436     if (!node())
437         return;
438 
439     if (node()->hasTagName(inputTag))
440         m_altText = static_cast<HTMLInputElement*>(node())->altText();
441     else if (node()->hasTagName(imgTag))
442         m_altText = static_cast<HTMLImageElement*>(node())->altText();
443 #if ENABLE(WML)
444     else if (node()->hasTagName(WMLNames::imgTag))
445         m_altText = static_cast<WMLImageElement*>(node())->altText();
446 #endif
447 }
448 
isLogicalWidthSpecified() const449 bool RenderImage::isLogicalWidthSpecified() const
450 {
451     switch (style()->logicalWidth().type()) {
452         case Fixed:
453         case Percent:
454             return true;
455         case Auto:
456         case Relative: // FIXME: Shouldn't this case return true?
457         case Intrinsic:
458         case MinIntrinsic:
459             return false;
460     }
461     ASSERT(false);
462     return false;
463 }
464 
isLogicalHeightSpecified() const465 bool RenderImage::isLogicalHeightSpecified() const
466 {
467     switch (style()->logicalHeight().type()) {
468         case Fixed:
469         case Percent:
470             return true;
471         case Auto:
472         case Relative: // FIXME: Shouldn't this case return true?
473         case Intrinsic:
474         case MinIntrinsic:
475             return false;
476     }
477     ASSERT(false);
478     return false;
479 }
480 
computeReplacedLogicalWidth(bool includeMaxWidth) const481 int RenderImage::computeReplacedLogicalWidth(bool includeMaxWidth) const
482 {
483     if (m_imageResource->imageHasRelativeWidth())
484         if (RenderObject* cb = isPositioned() ? container() : containingBlock()) {
485             if (cb->isBox())
486                 m_imageResource->setImageContainerSize(IntSize(toRenderBox(cb)->availableWidth(), toRenderBox(cb)->availableHeight()));
487         }
488 
489     int logicalWidth;
490     if (isLogicalWidthSpecified())
491         logicalWidth = computeReplacedLogicalWidthUsing(style()->logicalWidth());
492     else if (m_imageResource->usesImageContainerSize()) {
493         IntSize size = m_imageResource->imageSize(style()->effectiveZoom());
494         logicalWidth = style()->isHorizontalWritingMode() ? size.width() : size.height();
495     } else if (m_imageResource->imageHasRelativeWidth())
496         logicalWidth = 0; // If the image is relatively-sized, set the width to 0 until there is a set container size.
497     else
498         logicalWidth = calcAspectRatioLogicalWidth();
499 
500     int minLogicalWidth = computeReplacedLogicalWidthUsing(style()->logicalMinWidth());
501     int maxLogicalWidth = !includeMaxWidth || style()->logicalMaxWidth().isUndefined() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMaxWidth());
502 
503 #ifdef ANDROID_LAYOUT
504     logicalWidth = max(minLogicalWidth, min(logicalWidth, maxLogicalWidth));
505     // in SSR mode, we will fit the image to its container width
506     if (document()->settings()->layoutAlgorithm() == Settings::kLayoutSSR) {
507         int cw = containingBlockLogicalWidthForContent();
508         if (cw && logicalWidth > cw)
509             logicalWidth = cw;
510     }
511     return logicalWidth;
512 #else
513     return max(minLogicalWidth, min(logicalWidth, maxLogicalWidth));
514 #endif
515 }
516 
computeReplacedLogicalHeight() const517 int RenderImage::computeReplacedLogicalHeight() const
518 {
519     int logicalHeight;
520     if (isLogicalHeightSpecified())
521         logicalHeight = computeReplacedLogicalHeightUsing(style()->logicalHeight());
522     else if (m_imageResource->usesImageContainerSize()) {
523         IntSize size = m_imageResource->imageSize(style()->effectiveZoom());
524         logicalHeight = style()->isHorizontalWritingMode() ? size.height() : size.width();
525     } else if (m_imageResource->imageHasRelativeHeight())
526         logicalHeight = 0; // If the image is relatively-sized, set the height to 0 until there is a set container size.
527     else
528         logicalHeight = calcAspectRatioLogicalHeight();
529 
530     int minLogicalHeight = computeReplacedLogicalHeightUsing(style()->logicalMinHeight());
531     int maxLogicalHeight = style()->logicalMaxHeight().isUndefined() ? logicalHeight : computeReplacedLogicalHeightUsing(style()->logicalMaxHeight());
532 
533 #ifdef ANDROID_LAYOUT
534     logicalHeight = max(minLogicalHeight, min(logicalHeight, maxLogicalHeight));
535     // in SSR mode, we will fit the image to its container width
536     if (logicalHeight && document()->settings()->layoutAlgorithm() == Settings::kLayoutSSR) {
537         int logicalWidth;
538         if (isLogicalWidthSpecified())
539             logicalWidth = computeReplacedLogicalWidthUsing(style()->width());
540         else
541             logicalWidth = calcAspectRatioLogicalWidth();
542         int minLogicalWidth = computeReplacedLogicalWidthUsing(style()->minWidth());
543         int maxLogicalWidth = style()->maxWidth().value() == undefinedLength ? logicalWidth :
544             computeReplacedLogicalWidthUsing(style()->maxWidth());
545         logicalWidth = max(minLogicalWidth, min(logicalWidth, maxLogicalWidth));
546 
547         int cw = containingBlockLogicalWidthForContent();
548         if (cw && logicalWidth && logicalWidth > cw)
549             logicalHeight = cw * logicalHeight / logicalWidth;   // preserve aspect ratio
550     }
551     return logicalHeight;
552 #else
553     return max(minLogicalHeight, min(logicalHeight, maxLogicalHeight));
554 #endif
555 }
556 
calcAspectRatioLogicalWidth() const557 int RenderImage::calcAspectRatioLogicalWidth() const
558 {
559     int intrinsicWidth = intrinsicLogicalWidth();
560     int intrinsicHeight = intrinsicLogicalHeight();
561     if (!intrinsicHeight)
562         return 0;
563     if (!m_imageResource->hasImage() || m_imageResource->errorOccurred())
564         return intrinsicWidth; // Don't bother scaling.
565     return RenderBox::computeReplacedLogicalHeight() * intrinsicWidth / intrinsicHeight;
566 }
567 
calcAspectRatioLogicalHeight() const568 int RenderImage::calcAspectRatioLogicalHeight() const
569 {
570     int intrinsicWidth = intrinsicLogicalWidth();
571     int intrinsicHeight = intrinsicLogicalHeight();
572     if (!intrinsicWidth)
573         return 0;
574     if (!m_imageResource->hasImage() || m_imageResource->errorOccurred())
575         return intrinsicHeight; // Don't bother scaling.
576     return RenderBox::computeReplacedLogicalWidth() * intrinsicHeight / intrinsicWidth;
577 }
578 
579 } // namespace WebCore
580