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Diffstat (limited to 'Source/WebCore/rendering/RenderImage.cpp')
| -rw-r--r-- | Source/WebCore/rendering/RenderImage.cpp | 557 |
1 files changed, 557 insertions, 0 deletions
diff --git a/Source/WebCore/rendering/RenderImage.cpp b/Source/WebCore/rendering/RenderImage.cpp new file mode 100644 index 000000000..441722e91 --- /dev/null +++ b/Source/WebCore/rendering/RenderImage.cpp @@ -0,0 +1,557 @@ +/* + * 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; + } + + RenderBox* contentRenderer = embeddedContentBox(); + bool hasRelativeWidth = contentRenderer ? contentRenderer->style()->width().isPercent() : m_imageResource->imageHasRelativeWidth(); + bool hasRelativeHeight = contentRenderer ? contentRenderer->style()->height().isPercent() : m_imageResource->imageHasRelativeHeight(); + + IntSize containerSize; + if (hasRelativeWidth || hasRelativeHeight) { + // 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& 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()) + intrinsicRatio = cachedImage->image()->size(); +} + +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 |