| /* |
| * 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 "Frame.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 "SelectionController.h" |
| #include "TextRun.h" |
| #include <wtf/UnusedParam.h> |
| |
| #ifdef ANDROID_LAYOUT |
| #include "Settings.h" |
| #endif |
| |
| #if ENABLE(WML) |
| #include "WMLImageElement.h" |
| #include "WMLNames.h" |
| #endif |
| |
| using namespace std; |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| RenderImage::RenderImage(Node* node) |
| : RenderReplaced(node, IntSize(0, 0)) |
| , m_needsToSetSizeForAltText(false) |
| { |
| updateAltText(); |
| |
| view()->frameView()->setIsVisuallyNonEmpty(); |
| } |
| |
| 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->image()); |
| |
| // 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 + newImage->image()->width() * style()->effectiveZoom(), paddingHeight + newImage->image()->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->image()) |
| 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()) { |
| const Font& font = style()->font(); |
| IntSize textSize(min(font.width(TextRun(m_altText.characters(), m_altText.length())), 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; |
| |
| 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); |
| } |
| |
| void RenderImage::imageDimensionsChanged(bool imageSizeChanged, const IntRect* rect) |
| { |
| bool shouldRepaint = true; |
| |
| if (m_imageResource->imageSize(style()->effectiveZoom()) != intrinsicSize() || imageSizeChanged) { |
| if (!m_imageResource->errorOccurred()) |
| setIntrinsicSize(m_imageResource->imageSize(style()->effectiveZoom())); |
| |
| // 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) { |
| IntRect 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, int tx, int ty) |
| { |
| int cWidth = contentWidth(); |
| int cHeight = contentHeight(); |
| int leftBorder = borderLeft(); |
| int topBorder = borderTop(); |
| int leftPad = paddingLeft(); |
| int 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. |
| #ifdef ANDROID_FIX // see http://b/issue?id=2052757 |
| context->save(); |
| #endif |
| context->setStrokeStyle(SolidStroke); |
| context->setStrokeColor(Color::lightGray, style()->colorSpace()); |
| context->setFillColor(Color::transparent, style()->colorSpace()); |
| context->drawRect(IntRect(tx + leftBorder + leftPad, ty + topBorder + topPad, cWidth, cHeight)); |
| #ifdef ANDROID_FIX // see http://b/issue?id=2052757 |
| context->restore(); |
| #endif |
| |
| bool errorPictureDrawn = false; |
| int imageX = 0; |
| int imageY = 0; |
| // When calculating the usable dimensions, exclude the pixels of |
| // the ouline rect so the error image/alt text doesn't draw on it. |
| int usableWidth = cWidth - 2; |
| int usableHeight = cHeight - 2; |
| |
| RefPtr<Image> image = m_imageResource->image(); |
| |
| if (m_imageResource->errorOccurred() && !image->isNull() && usableWidth >= image->width() && usableHeight >= image->height()) { |
| // Center the error image, accounting for border and padding. |
| int centerX = (usableWidth - image->width()) / 2; |
| if (centerX < 0) |
| centerX = 0; |
| int centerY = (usableHeight - image->height()) / 2; |
| if (centerY < 0) |
| centerY = 0; |
| imageX = leftBorder + leftPad + centerX + 1; |
| imageY = topBorder + topPad + centerY + 1; |
| context->drawImage(image.get(), style()->colorSpace(), IntPoint(tx + imageX, ty + imageY)); |
| errorPictureDrawn = true; |
| } |
| |
| if (!m_altText.isEmpty()) { |
| String text = document()->displayStringModifiedByEncoding(m_altText); |
| context->setFillColor(style()->visitedDependentColor(CSSPropertyColor), style()->colorSpace()); |
| int ax = tx + leftBorder + leftPad; |
| int ay = ty + topBorder + topPad; |
| const Font& font = style()->font(); |
| const FontMetrics& fontMetrics = font.fontMetrics(); |
| int ascent = fontMetrics.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(text.characters(), text.length()); |
| int textWidth = font.width(textRun); |
| if (errorPictureDrawn) { |
| if (usableWidth >= textWidth && fontMetrics.height() <= imageY) |
| context->drawText(font, textRun, IntPoint(ax, ay + ascent)); |
| } else if (usableWidth >= textWidth && cHeight >= fontMetrics.height()) |
| context->drawText(font, textRun, IntPoint(ax, ay + ascent)); |
| } |
| } |
| } 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(tx - x(), ty - y(), style()->highlight(), true); |
| #endif |
| |
| IntSize contentSize(cWidth, cHeight); |
| IntRect rect(IntPoint(tx + leftBorder + leftPad, ty + topBorder + topPad), contentSize); |
| paintIntoRect(context, rect); |
| } |
| } |
| |
| void RenderImage::paint(PaintInfo& paintInfo, int tx, int ty) |
| { |
| RenderReplaced::paint(paintInfo, tx, ty); |
| |
| 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 IntRect& 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); |
| } |
| |
| 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->document()->getImageMap(i->fastGetAttribute(usemapAttr)) : 0; |
| } |
| |
| bool RenderImage::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) |
| { |
| HitTestResult tempResult(result.point(), result.topPadding(), result.rightPadding(), result.bottomPadding(), result.leftPadding()); |
| bool inside = RenderReplaced::nodeAtPoint(request, tempResult, x, y, tx, ty, hitTestAction); |
| |
| if (tempResult.innerNode() && node()) { |
| if (HTMLMapElement* map = imageMap()) { |
| IntRect contentBox = contentBoxRect(); |
| float zoom = style()->effectiveZoom(); |
| int mapX = lroundf((x - tx - this->x() - contentBox.x()) / zoom); |
| int mapY = lroundf((y - ty - this->y() - contentBox.y()) / zoom); |
| if (map->mapMouseEvent(mapX, mapY, 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(); |
| #if ENABLE(WML) |
| else if (node()->hasTagName(WMLNames::imgTag)) |
| m_altText = static_cast<WMLImageElement*>(node())->altText(); |
| #endif |
| } |
| |
| bool RenderImage::isLogicalWidthSpecified() const |
| { |
| switch (style()->logicalWidth().type()) { |
| case Fixed: |
| case Percent: |
| return true; |
| case Auto: |
| case Relative: // FIXME: Shouldn't this case return true? |
| case Intrinsic: |
| case MinIntrinsic: |
| return false; |
| } |
| ASSERT(false); |
| return false; |
| } |
| |
| bool RenderImage::isLogicalHeightSpecified() const |
| { |
| switch (style()->logicalHeight().type()) { |
| case Fixed: |
| case Percent: |
| return true; |
| case Auto: |
| case Relative: // FIXME: Shouldn't this case return true? |
| case Intrinsic: |
| case MinIntrinsic: |
| return false; |
| } |
| ASSERT(false); |
| return false; |
| } |
| |
| int RenderImage::computeReplacedLogicalWidth(bool includeMaxWidth) const |
| { |
| if (m_imageResource->imageHasRelativeWidth()) |
| if (RenderObject* cb = isPositioned() ? container() : containingBlock()) { |
| if (cb->isBox()) |
| m_imageResource->setImageContainerSize(IntSize(toRenderBox(cb)->availableWidth(), toRenderBox(cb)->availableHeight())); |
| } |
| |
| int logicalWidth; |
| if (isLogicalWidthSpecified()) |
| logicalWidth = computeReplacedLogicalWidthUsing(style()->logicalWidth()); |
| else if (m_imageResource->usesImageContainerSize()) { |
| IntSize size = m_imageResource->imageSize(style()->effectiveZoom()); |
| logicalWidth = style()->isHorizontalWritingMode() ? size.width() : size.height(); |
| } else if (m_imageResource->imageHasRelativeWidth()) |
| logicalWidth = 0; // If the image is relatively-sized, set the width to 0 until there is a set container size. |
| else |
| logicalWidth = calcAspectRatioLogicalWidth(); |
| |
| int minLogicalWidth = computeReplacedLogicalWidthUsing(style()->logicalMinWidth()); |
| int maxLogicalWidth = !includeMaxWidth || style()->logicalMaxWidth().isUndefined() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMaxWidth()); |
| |
| #ifdef ANDROID_LAYOUT |
| logicalWidth = max(minLogicalWidth, min(logicalWidth, maxLogicalWidth)); |
| // in SSR mode, we will fit the image to its container width |
| if (document()->settings()->layoutAlgorithm() == Settings::kLayoutSSR) { |
| int cw = containingBlockLogicalWidthForContent(); |
| if (cw && logicalWidth > cw) |
| logicalWidth = cw; |
| } |
| return logicalWidth; |
| #else |
| return max(minLogicalWidth, min(logicalWidth, maxLogicalWidth)); |
| #endif |
| } |
| |
| int RenderImage::computeReplacedLogicalHeight() const |
| { |
| int logicalHeight; |
| if (isLogicalHeightSpecified()) |
| logicalHeight = computeReplacedLogicalHeightUsing(style()->logicalHeight()); |
| else if (m_imageResource->usesImageContainerSize()) { |
| IntSize size = m_imageResource->imageSize(style()->effectiveZoom()); |
| logicalHeight = style()->isHorizontalWritingMode() ? size.height() : size.width(); |
| } else if (m_imageResource->imageHasRelativeHeight()) |
| logicalHeight = 0; // If the image is relatively-sized, set the height to 0 until there is a set container size. |
| else |
| logicalHeight = calcAspectRatioLogicalHeight(); |
| |
| int minLogicalHeight = computeReplacedLogicalHeightUsing(style()->logicalMinHeight()); |
| int maxLogicalHeight = style()->logicalMaxHeight().isUndefined() ? logicalHeight : computeReplacedLogicalHeightUsing(style()->logicalMaxHeight()); |
| |
| #ifdef ANDROID_LAYOUT |
| logicalHeight = max(minLogicalHeight, min(logicalHeight, maxLogicalHeight)); |
| // in SSR mode, we will fit the image to its container width |
| if (logicalHeight && document()->settings()->layoutAlgorithm() == Settings::kLayoutSSR) { |
| int logicalWidth; |
| if (isLogicalWidthSpecified()) |
| logicalWidth = computeReplacedLogicalWidthUsing(style()->width()); |
| else |
| logicalWidth = calcAspectRatioLogicalWidth(); |
| int minLogicalWidth = computeReplacedLogicalWidthUsing(style()->minWidth()); |
| int maxLogicalWidth = style()->maxWidth().value() == undefinedLength ? logicalWidth : |
| computeReplacedLogicalWidthUsing(style()->maxWidth()); |
| logicalWidth = max(minLogicalWidth, min(logicalWidth, maxLogicalWidth)); |
| |
| int cw = containingBlockLogicalWidthForContent(); |
| if (cw && logicalWidth && logicalWidth > cw) |
| logicalHeight = cw * logicalHeight / logicalWidth; // preserve aspect ratio |
| } |
| return logicalHeight; |
| #else |
| return max(minLogicalHeight, min(logicalHeight, maxLogicalHeight)); |
| #endif |
| } |
| |
| int RenderImage::calcAspectRatioLogicalWidth() const |
| { |
| int intrinsicWidth = intrinsicLogicalWidth(); |
| int intrinsicHeight = intrinsicLogicalHeight(); |
| if (!intrinsicHeight) |
| return 0; |
| if (!m_imageResource->hasImage() || m_imageResource->errorOccurred()) |
| return intrinsicWidth; // Don't bother scaling. |
| return RenderBox::computeReplacedLogicalHeight() * intrinsicWidth / intrinsicHeight; |
| } |
| |
| int RenderImage::calcAspectRatioLogicalHeight() const |
| { |
| int intrinsicWidth = intrinsicLogicalWidth(); |
| int intrinsicHeight = intrinsicLogicalHeight(); |
| if (!intrinsicWidth) |
| return 0; |
| if (!m_imageResource->hasImage() || m_imageResource->errorOccurred()) |
| return intrinsicHeight; // Don't bother scaling. |
| return RenderBox::computeReplacedLogicalWidth() * intrinsicHeight / intrinsicWidth; |
| } |
| |
| } // namespace WebCore |
