| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com) |
| * (C) 2006 Samuel Weinig (sam.weinig@gmail.com) |
| * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. |
| * Copyright (C) 2010 Google Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "RenderImage.h" |
| |
| #include "BitmapImage.h" |
| #include "FontCache.h" |
| #include "Frame.h" |
| #include "FrameSelection.h" |
| #include "GraphicsContext.h" |
| #include "HTMLAreaElement.h" |
| #include "HTMLImageElement.h" |
| #include "HTMLInputElement.h" |
| #include "HTMLMapElement.h" |
| #include "HTMLNames.h" |
| #include "HitTestResult.h" |
| #include "Page.h" |
| #include "RenderLayer.h" |
| #include "RenderView.h" |
| #include "SVGImage.h" |
| #include <wtf/UnusedParam.h> |
| |
| using namespace std; |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| RenderImage::RenderImage(Node* node) |
| : RenderReplaced(node, IntSize()) |
| , m_needsToSetSizeForAltText(false) |
| , m_didIncrementVisuallyNonEmptyPixelCount(false) |
| , m_isGeneratedContent(false) |
| { |
| updateAltText(); |
| } |
| |
| RenderImage::~RenderImage() |
| { |
| ASSERT(m_imageResource); |
| m_imageResource->shutdown(); |
| } |
| |
| void RenderImage::setImageResource(PassOwnPtr<RenderImageResource> imageResource) |
| { |
| ASSERT(!m_imageResource); |
| m_imageResource = imageResource; |
| m_imageResource->initialize(this); |
| } |
| |
| // If we'll be displaying either alt text or an image, add some padding. |
| static const unsigned short paddingWidth = 4; |
| static const unsigned short paddingHeight = 4; |
| |
| // Alt text is restricted to this maximum size, in pixels. These are |
| // signed integers because they are compared with other signed values. |
| static const float maxAltTextWidth = 1024; |
| static const int maxAltTextHeight = 256; |
| |
| IntSize RenderImage::imageSizeForError(CachedImage* newImage) const |
| { |
| ASSERT_ARG(newImage, newImage); |
| ASSERT_ARG(newImage, newImage->imageForRenderer(this)); |
| |
| IntSize imageSize; |
| if (newImage->willPaintBrokenImage()) { |
| float deviceScaleFactor = WebCore::deviceScaleFactor(frame()); |
| pair<Image*, float> brokenImageAndImageScaleFactor = newImage->brokenImage(deviceScaleFactor); |
| imageSize = brokenImageAndImageScaleFactor.first->size(); |
| imageSize.scale(1 / brokenImageAndImageScaleFactor.second); |
| } else |
| imageSize = newImage->imageForRenderer(this)->size(); |
| |
| // imageSize() returns 0 for the error image. We need the true size of the |
| // error image, so we have to get it by grabbing image() directly. |
| return IntSize(paddingWidth + imageSize.width() * style()->effectiveZoom(), paddingHeight + imageSize.height() * style()->effectiveZoom()); |
| } |
| |
| // Sets the image height and width to fit the alt text. Returns true if the |
| // image size changed. |
| bool RenderImage::setImageSizeForAltText(CachedImage* newImage /* = 0 */) |
| { |
| IntSize imageSize; |
| if (newImage && newImage->imageForRenderer(this)) |
| imageSize = imageSizeForError(newImage); |
| else if (!m_altText.isEmpty() || newImage) { |
| // If we'll be displaying either text or an image, add a little padding. |
| imageSize = IntSize(paddingWidth, paddingHeight); |
| } |
| |
| // we have an alt and the user meant it (its not a text we invented) |
| if (!m_altText.isEmpty()) { |
| FontCachePurgePreventer fontCachePurgePreventer; |
| |
| const Font& font = style()->font(); |
| IntSize textSize(min(font.width(RenderBlock::constructTextRun(this, font, m_altText, style())), maxAltTextWidth), min(font.fontMetrics().height(), maxAltTextHeight)); |
| imageSize = imageSize.expandedTo(textSize); |
| } |
| |
| if (imageSize == intrinsicSize()) |
| return false; |
| |
| setIntrinsicSize(imageSize); |
| return true; |
| } |
| |
| void RenderImage::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) |
| { |
| RenderReplaced::styleDidChange(diff, oldStyle); |
| if (m_needsToSetSizeForAltText) { |
| if (!m_altText.isEmpty() && setImageSizeForAltText(m_imageResource->cachedImage())) |
| imageDimensionsChanged(true /* imageSizeChanged */); |
| m_needsToSetSizeForAltText = false; |
| } |
| } |
| |
| void RenderImage::imageChanged(WrappedImagePtr newImage, const IntRect* rect) |
| { |
| if (documentBeingDestroyed()) |
| return; |
| |
| if (hasBoxDecorations() || hasMask()) |
| RenderReplaced::imageChanged(newImage, rect); |
| |
| if (!m_imageResource) |
| return; |
| |
| if (newImage != m_imageResource->imagePtr() || !newImage) |
| return; |
| |
| if (!m_didIncrementVisuallyNonEmptyPixelCount) { |
| view()->frameView()->incrementVisuallyNonEmptyPixelCount(m_imageResource->imageSize(1.0f)); |
| m_didIncrementVisuallyNonEmptyPixelCount = true; |
| } |
| |
| bool imageSizeChanged = false; |
| |
| // Set image dimensions, taking into account the size of the alt text. |
| if (m_imageResource->errorOccurred()) { |
| if (!m_altText.isEmpty() && document()->isPendingStyleRecalc()) { |
| ASSERT(node()); |
| if (node()) { |
| m_needsToSetSizeForAltText = true; |
| node()->setNeedsStyleRecalc(SyntheticStyleChange); |
| } |
| return; |
| } |
| imageSizeChanged = setImageSizeForAltText(m_imageResource->cachedImage()); |
| } |
| |
| imageDimensionsChanged(imageSizeChanged, rect); |
| } |
| |
| bool RenderImage::updateIntrinsicSizeIfNeeded(const LayoutSize& newSize, bool imageSizeChanged) |
| { |
| if (newSize == intrinsicSize() && !imageSizeChanged) |
| return false; |
| if (m_imageResource->errorOccurred()) |
| return imageSizeChanged; |
| setIntrinsicSize(newSize); |
| return true; |
| } |
| |
| void RenderImage::imageDimensionsChanged(bool imageSizeChanged, const IntRect* rect) |
| { |
| bool shouldRepaint = true; |
| if (updateIntrinsicSizeIfNeeded(m_imageResource->imageSize(style()->effectiveZoom()), imageSizeChanged)) { |
| // In the case of generated image content using :before/:after, we might not be in the |
| // render tree yet. In that case, we don't need to worry about check for layout, since we'll get a |
| // layout when we get added in to the render tree hierarchy later. |
| if (containingBlock()) { |
| // lets see if we need to relayout at all.. |
| int oldwidth = width(); |
| int oldheight = height(); |
| if (!preferredLogicalWidthsDirty()) |
| setPreferredLogicalWidthsDirty(true); |
| computeLogicalWidth(); |
| computeLogicalHeight(); |
| |
| if (imageSizeChanged || width() != oldwidth || height() != oldheight) { |
| shouldRepaint = false; |
| if (!selfNeedsLayout()) |
| setNeedsLayout(true); |
| } |
| |
| setWidth(oldwidth); |
| setHeight(oldheight); |
| } |
| } |
| |
| if (shouldRepaint) { |
| LayoutRect repaintRect; |
| if (rect) { |
| // The image changed rect is in source image coordinates (pre-zooming), |
| // so map from the bounds of the image to the contentsBox. |
| repaintRect = enclosingIntRect(mapRect(*rect, FloatRect(FloatPoint(), m_imageResource->imageSize(1.0f)), contentBoxRect())); |
| // Guard against too-large changed rects. |
| repaintRect.intersect(contentBoxRect()); |
| } else |
| repaintRect = contentBoxRect(); |
| |
| repaintRectangle(repaintRect); |
| |
| #if USE(ACCELERATED_COMPOSITING) |
| if (hasLayer()) { |
| // Tell any potential compositing layers that the image needs updating. |
| layer()->contentChanged(RenderLayer::ImageChanged); |
| } |
| #endif |
| } |
| } |
| |
| void RenderImage::notifyFinished(CachedResource* newImage) |
| { |
| if (!m_imageResource) |
| return; |
| |
| if (documentBeingDestroyed()) |
| return; |
| |
| #if USE(ACCELERATED_COMPOSITING) |
| if (newImage == m_imageResource->cachedImage() && hasLayer()) { |
| // tell any potential compositing layers |
| // that the image is done and they can reference it directly. |
| layer()->contentChanged(RenderLayer::ImageChanged); |
| } |
| #else |
| UNUSED_PARAM(newImage); |
| #endif |
| } |
| |
| void RenderImage::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset) |
| { |
| LayoutUnit cWidth = contentWidth(); |
| LayoutUnit cHeight = contentHeight(); |
| LayoutUnit leftBorder = borderLeft(); |
| LayoutUnit topBorder = borderTop(); |
| LayoutUnit leftPad = paddingLeft(); |
| LayoutUnit topPad = paddingTop(); |
| |
| GraphicsContext* context = paintInfo.context; |
| |
| if (!m_imageResource->hasImage() || m_imageResource->errorOccurred()) { |
| if (paintInfo.phase == PaintPhaseSelection) |
| return; |
| |
| if (cWidth > 2 && cHeight > 2) { |
| // Draw an outline rect where the image should be. |
| context->setStrokeStyle(SolidStroke); |
| context->setStrokeColor(Color::lightGray, style()->colorSpace()); |
| context->setFillColor(Color::transparent, style()->colorSpace()); |
| context->drawRect(LayoutRect(paintOffset.x() + leftBorder + leftPad, paintOffset.y() + topBorder + topPad, cWidth, cHeight)); |
| |
| bool errorPictureDrawn = false; |
| LayoutSize imageOffset; |
| // When calculating the usable dimensions, exclude the pixels of |
| // the ouline rect so the error image/alt text doesn't draw on it. |
| LayoutUnit usableWidth = cWidth - 2; |
| LayoutUnit usableHeight = cHeight - 2; |
| |
| RefPtr<Image> image = m_imageResource->image(); |
| |
| if (m_imageResource->errorOccurred() && !image->isNull() && usableWidth >= image->width() && usableHeight >= image->height()) { |
| float deviceScaleFactor = WebCore::deviceScaleFactor(frame()); |
| // Call brokenImage() explicitly to ensure we get the broken image icon at the appropriate resolution. |
| pair<Image*, float> brokenImageAndImageScaleFactor = m_imageResource->cachedImage()->brokenImage(deviceScaleFactor); |
| image = brokenImageAndImageScaleFactor.first; |
| IntSize imageSize = image->size(); |
| imageSize.scale(1 / brokenImageAndImageScaleFactor.second); |
| // Center the error image, accounting for border and padding. |
| LayoutUnit centerX = (usableWidth - imageSize.width()) / 2; |
| if (centerX < 0) |
| centerX = 0; |
| LayoutUnit centerY = (usableHeight - imageSize.height()) / 2; |
| if (centerY < 0) |
| centerY = 0; |
| imageOffset = LayoutSize(leftBorder + leftPad + centerX + 1, topBorder + topPad + centerY + 1); |
| context->drawImage(image.get(), style()->colorSpace(), IntRect(paintOffset + imageOffset, imageSize)); |
| errorPictureDrawn = true; |
| } |
| |
| if (!m_altText.isEmpty()) { |
| String text = document()->displayStringModifiedByEncoding(m_altText); |
| context->setFillColor(style()->visitedDependentColor(CSSPropertyColor), style()->colorSpace()); |
| const Font& font = style()->font(); |
| const FontMetrics& fontMetrics = font.fontMetrics(); |
| LayoutUnit ascent = fontMetrics.ascent(); |
| LayoutPoint altTextOffset = paintOffset; |
| altTextOffset.move(leftBorder + leftPad, topBorder + topPad + ascent); |
| |
| // Only draw the alt text if it'll fit within the content box, |
| // and only if it fits above the error image. |
| TextRun textRun = RenderBlock::constructTextRun(this, font, text, style()); |
| LayoutUnit textWidth = font.width(textRun); |
| if (errorPictureDrawn) { |
| if (usableWidth >= textWidth && fontMetrics.height() <= imageOffset.height()) |
| context->drawText(font, textRun, altTextOffset); |
| } else if (usableWidth >= textWidth && cHeight >= fontMetrics.height()) |
| context->drawText(font, textRun, altTextOffset); |
| } |
| } |
| } else if (m_imageResource->hasImage() && cWidth > 0 && cHeight > 0) { |
| RefPtr<Image> img = m_imageResource->image(cWidth, cHeight); |
| if (!img || img->isNull()) |
| return; |
| |
| #if PLATFORM(MAC) |
| if (style()->highlight() != nullAtom && !paintInfo.context->paintingDisabled()) |
| paintCustomHighlight(toPoint(paintOffset - location()), style()->highlight(), true); |
| #endif |
| |
| LayoutSize contentSize(cWidth, cHeight); |
| LayoutPoint contentLocation = paintOffset; |
| contentLocation.move(leftBorder + leftPad, topBorder + topPad); |
| paintIntoRect(context, LayoutRect(contentLocation, contentSize)); |
| } |
| } |
| |
| void RenderImage::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset) |
| { |
| RenderReplaced::paint(paintInfo, paintOffset); |
| |
| if (paintInfo.phase == PaintPhaseOutline) |
| paintAreaElementFocusRing(paintInfo); |
| } |
| |
| void RenderImage::paintAreaElementFocusRing(PaintInfo& paintInfo) |
| { |
| Document* document = this->document(); |
| |
| if (document->printing() || !document->frame()->selection()->isFocusedAndActive()) |
| return; |
| |
| if (paintInfo.context->paintingDisabled() && !paintInfo.context->updatingControlTints()) |
| return; |
| |
| Node* focusedNode = document->focusedNode(); |
| if (!focusedNode || !focusedNode->hasTagName(areaTag)) |
| return; |
| |
| HTMLAreaElement* areaElement = static_cast<HTMLAreaElement*>(focusedNode); |
| if (areaElement->imageElement() != node()) |
| return; |
| |
| // Even if the theme handles focus ring drawing for entire elements, it won't do it for |
| // an area within an image, so we don't call RenderTheme::supportsFocusRing here. |
| |
| Path path = areaElement->computePath(this); |
| if (path.isEmpty()) |
| return; |
| |
| // FIXME: Do we need additional code to clip the path to the image's bounding box? |
| |
| RenderStyle* areaElementStyle = areaElement->computedStyle(); |
| unsigned short outlineWidth = areaElementStyle->outlineWidth(); |
| if (!outlineWidth) |
| return; |
| |
| paintInfo.context->drawFocusRing(path, outlineWidth, |
| areaElementStyle->outlineOffset(), |
| areaElementStyle->visitedDependentColor(CSSPropertyOutlineColor)); |
| } |
| |
| void RenderImage::areaElementFocusChanged(HTMLAreaElement* element) |
| { |
| ASSERT_UNUSED(element, element->imageElement() == node()); |
| |
| // It would be more efficient to only repaint the focus ring rectangle |
| // for the passed-in area element. That would require adding functions |
| // to the area element class. |
| repaint(); |
| } |
| |
| void RenderImage::paintIntoRect(GraphicsContext* context, const LayoutRect& rect) |
| { |
| if (!m_imageResource->hasImage() || m_imageResource->errorOccurred() || rect.width() <= 0 || rect.height() <= 0) |
| return; |
| |
| RefPtr<Image> img = m_imageResource->image(rect.width(), rect.height()); |
| if (!img || img->isNull()) |
| return; |
| |
| HTMLImageElement* imageElt = (node() && node()->hasTagName(imgTag)) ? static_cast<HTMLImageElement*>(node()) : 0; |
| CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver; |
| Image* image = m_imageResource->image().get(); |
| bool useLowQualityScaling = shouldPaintAtLowQuality(context, image, image, rect.size()); |
| context->drawImage(m_imageResource->image(rect.width(), rect.height()).get(), style()->colorSpace(), rect, compositeOperator, useLowQualityScaling); |
| } |
| |
| bool RenderImage::backgroundIsObscured() const |
| { |
| if (!m_imageResource->hasImage() || m_imageResource->errorOccurred()) |
| return false; |
| |
| if (m_imageResource->cachedImage() && !m_imageResource->cachedImage()->isLoaded()) |
| return false; |
| |
| EFillBox backgroundClip = style()->backgroundClip(); |
| |
| // Background paints under borders. |
| if (backgroundClip == BorderFillBox && style()->hasBorder() && !borderObscuresBackground()) |
| return false; |
| |
| // Background shows in padding area. |
| if ((backgroundClip == BorderFillBox || backgroundClip == PaddingFillBox) && style()->hasPadding()) |
| return false; |
| |
| // Check for bitmap image with alpha. |
| Image* image = m_imageResource->image().get(); |
| if (!image || !image->isBitmapImage() || image->currentFrameHasAlpha()) |
| return false; |
| |
| return true; |
| } |
| |
| int RenderImage::minimumReplacedHeight() const |
| { |
| return m_imageResource->errorOccurred() ? intrinsicSize().height() : 0; |
| } |
| |
| HTMLMapElement* RenderImage::imageMap() const |
| { |
| HTMLImageElement* i = node() && node()->hasTagName(imgTag) ? static_cast<HTMLImageElement*>(node()) : 0; |
| return i ? i->treeScope()->getImageMap(i->fastGetAttribute(usemapAttr)) : 0; |
| } |
| |
| bool RenderImage::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) |
| { |
| HitTestResult tempResult(result.point(), result.topPadding(), result.rightPadding(), result.bottomPadding(), result.leftPadding()); |
| bool inside = RenderReplaced::nodeAtPoint(request, tempResult, pointInContainer, accumulatedOffset, hitTestAction); |
| |
| if (tempResult.innerNode() && node()) { |
| if (HTMLMapElement* map = imageMap()) { |
| LayoutRect contentBox = contentBoxRect(); |
| float scaleFactor = 1 / style()->effectiveZoom(); |
| LayoutPoint mapLocation(pointInContainer.x() - accumulatedOffset.x() - this->x() - contentBox.x(), pointInContainer.y() - accumulatedOffset.y() - this->y() - contentBox.y()); |
| mapLocation.scale(scaleFactor, scaleFactor); |
| |
| if (map->mapMouseEvent(mapLocation, contentBox.size(), tempResult)) |
| tempResult.setInnerNonSharedNode(node()); |
| } |
| } |
| |
| if (!inside && result.isRectBasedTest()) |
| result.append(tempResult); |
| if (inside) |
| result = tempResult; |
| return inside; |
| } |
| |
| void RenderImage::updateAltText() |
| { |
| if (!node()) |
| return; |
| |
| if (node()->hasTagName(inputTag)) |
| m_altText = static_cast<HTMLInputElement*>(node())->altText(); |
| else if (node()->hasTagName(imgTag)) |
| m_altText = static_cast<HTMLImageElement*>(node())->altText(); |
| } |
| |
| LayoutUnit RenderImage::computeReplacedLogicalWidth(bool includeMaxWidth) const |
| { |
| // If we've got an explicit width/height assigned, propagate it to the image resource. |
| if (style()->logicalWidth().isFixed() && style()->logicalHeight().isFixed()) { |
| LayoutUnit width = RenderReplaced::computeReplacedLogicalWidth(includeMaxWidth); |
| m_imageResource->setContainerSizeForRenderer(IntSize(width, computeReplacedLogicalHeight())); |
| return width; |
| } |
| |
| IntSize containerSize; |
| if (m_imageResource->imageHasRelativeWidth() || m_imageResource->imageHasRelativeHeight()) { |
| // Propagate the containing block size to the image resource, otherwhise we can't compute our own intrinsic size, if it's relative. |
| RenderObject* containingBlock = isPositioned() ? container() : this->containingBlock(); |
| if (containingBlock->isBox()) { |
| RenderBox* box = toRenderBox(containingBlock); |
| containerSize = IntSize(box->availableWidth(), box->availableHeight()); // Already contains zooming information. |
| } |
| } else { |
| // Propagate the current zoomed image size to the image resource, otherwhise the image size will remain the same on-screen. |
| CachedImage* cachedImage = m_imageResource->cachedImage(); |
| if (cachedImage && cachedImage->image()) { |
| containerSize = cachedImage->image()->size(); |
| // FIXME: Remove unnecessary rounding when layout is off ints: webkit.org/b/63656 |
| containerSize.setWidth(static_cast<LayoutUnit>(containerSize.width() * style()->effectiveZoom())); |
| containerSize.setHeight(static_cast<LayoutUnit>(containerSize.height() * style()->effectiveZoom())); |
| } |
| } |
| |
| if (!containerSize.isEmpty()) { |
| m_imageResource->setContainerSizeForRenderer(containerSize); |
| const_cast<RenderImage*>(this)->updateIntrinsicSizeIfNeeded(containerSize, false); |
| } |
| |
| return RenderReplaced::computeReplacedLogicalWidth(includeMaxWidth); |
| } |
| |
| void RenderImage::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const |
| { |
| // Assure this method is never used for SVGImages. |
| ASSERT(!embeddedContentBox()); |
| isPercentageIntrinsicSize = false; |
| CachedImage* cachedImage = m_imageResource ? m_imageResource->cachedImage() : 0; |
| if (!cachedImage || !cachedImage->image()) |
| return; |
| intrinsicSize = cachedImage->image()->size(); |
| intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height()); |
| } |
| |
| bool RenderImage::needsPreferredWidthsRecalculation() const |
| { |
| if (RenderReplaced::needsPreferredWidthsRecalculation()) |
| return true; |
| return embeddedContentBox(); |
| } |
| |
| RenderBox* RenderImage::embeddedContentBox() const |
| { |
| if (!m_imageResource) |
| return 0; |
| |
| #if ENABLE(SVG) |
| CachedImage* cachedImage = m_imageResource->cachedImage(); |
| if (cachedImage && cachedImage->image() && cachedImage->image()->isSVGImage()) |
| return static_cast<SVGImage*>(cachedImage->image())->embeddedContentBox(); |
| #endif |
| |
| return 0; |
| } |
| |
| } // namespace WebCore |
