--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/RenderImage.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,537 @@
+/*
+ * 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 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 "HTMLCollection.h"
+#include "HTMLImageElement.h"
+#include "HTMLInputElement.h"
+#include "HTMLMapElement.h"
+#include "HTMLNames.h"
+#include "HitTestResult.h"
+#include "Page.h"
+#include "RenderLayer.h"
+#include "RenderTheme.h"
+#include "RenderView.h"
+#include "SelectionController.h"
+#include <wtf/CurrentTime.h>
+#include <wtf/UnusedParam.h>
+
+#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_cachedImage(0)
+{
+ updateAltText();
+
+ view()->frameView()->setIsVisuallyNonEmpty();
+}
+
+RenderImage::~RenderImage()
+{
+ if (m_cachedImage)
+ m_cachedImage->removeClient(this);
+}
+
+void RenderImage::setCachedImage(CachedImage* newImage)
+{
+ if (m_cachedImage == newImage)
+ return;
+ if (m_cachedImage)
+ m_cachedImage->removeClient(this);
+ m_cachedImage = newImage;
+ if (m_cachedImage) {
+ m_cachedImage->addClient(this);
+ if (m_cachedImage->errorOccurred())
+ imageChanged(m_cachedImage.get());
+ }
+}
+
+// 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 int maxAltTextWidth = 1024;
+static const int maxAltTextHeight = 256;
+
+// Sets the image height and width to fit the alt text. Returns true if the
+// image size changed.
+bool RenderImage::setImageSizeForAltText(CachedImage* newImage /* = 0 */)
+{
+ int imageWidth = 0;
+ int imageHeight = 0;
+
+ // If we'll be displaying either text or an image, add a little padding.
+ if (!m_altText.isEmpty() || newImage) {
+ imageWidth = paddingWidth;
+ imageHeight = paddingHeight;
+ }
+
+ if (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.
+ imageWidth += newImage->image()->width() * style()->effectiveZoom();
+ imageHeight += newImage->image()->height() * style()->effectiveZoom();
+ }
+
+ // we have an alt and the user meant it (its not a text we invented)
+ if (!m_altText.isEmpty()) {
+ const Font& font = style()->font();
+ imageWidth = max(imageWidth, min(font.width(TextRun(m_altText.characters(), m_altText.length())), maxAltTextWidth));
+ imageHeight = max(imageHeight, min(font.height(), maxAltTextHeight));
+ }
+
+ IntSize imageSize = IntSize(imageWidth, imageHeight);
+ if (imageSize == intrinsicSize())
+ return false;
+
+ setIntrinsicSize(imageSize);
+ return true;
+}
+
+void RenderImage::imageChanged(WrappedImagePtr newImage, const IntRect* rect)
+{
+ if (documentBeingDestroyed())
+ return;
+
+ if (hasBoxDecorations() || hasMask())
+ RenderReplaced::imageChanged(newImage, rect);
+
+ if (newImage != imagePtr() || !newImage)
+ return;
+
+ bool imageSizeChanged = false;
+
+ // Set image dimensions, taking into account the size of the alt text.
+ if (errorOccurred())
+ imageSizeChanged = setImageSizeForAltText(m_cachedImage.get());
+
+ bool shouldRepaint = true;
+
+ // Image dimensions have been changed, see what needs to be done
+ if (imageSize(style()->effectiveZoom()) != intrinsicSize() || imageSizeChanged) {
+ if (!errorOccurred())
+ setIntrinsicSize(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 (!prefWidthsDirty())
+ setPrefWidthsDirty(true);
+ calcWidth();
+ calcHeight();
+
+ 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(), 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()->rendererContentChanged();
+ }
+#endif
+ }
+}
+
+void RenderImage::notifyFinished(CachedResource* newImage)
+{
+ if (documentBeingDestroyed())
+ return;
+
+#if USE(ACCELERATED_COMPOSITING)
+ if ((newImage == m_cachedImage) && hasLayer()) {
+ // tell any potential compositing layers
+ // that the image is done and they can reference it directly.
+ layer()->rendererContentChanged();
+ }
+#else
+ UNUSED_PARAM(newImage);
+#endif
+}
+
+void RenderImage::resetAnimation()
+{
+ if (m_cachedImage) {
+ image()->resetAnimation();
+ if (!needsLayout())
+ repaint();
+ }
+}
+
+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();
+
+ if (document()->printing() && !view()->printImages())
+ return;
+
+ GraphicsContext* context = paintInfo.context;
+
+ if (!hasImage() || 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(IntRect(tx + leftBorder + leftPad, ty + topBorder + topPad, cWidth, cHeight));
+
+ 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;
+
+ if (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(), 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();
+ int ascent = font.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 && font.height() <= imageY)
+ context->drawText(style()->font(), textRun, IntPoint(ax, ay + ascent));
+ } else if (usableWidth >= textWidth && cHeight >= font.height())
+ context->drawText(style()->font(), textRun, IntPoint(ax, ay + ascent));
+ }
+ }
+ } else if (hasImage() && cWidth > 0 && cHeight > 0) {
+ Image* img = 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)
+ paintFocusRings(paintInfo, style());
+}
+
+void RenderImage::paintFocusRings(PaintInfo& paintInfo, const RenderStyle* style)
+{
+ // Don't draw focus rings if printing.
+ if (document()->printing() || !frame()->selection()->isFocusedAndActive())
+ return;
+
+ if (paintInfo.context->paintingDisabled() && !paintInfo.context->updatingControlTints())
+ return;
+
+ HTMLMapElement* mapElement = imageMap();
+ if (!mapElement)
+ return;
+
+ Document* document = mapElement->document();
+ if (!document)
+ return;
+
+ Node* focusedNode = document->focusedNode();
+ if (!focusedNode)
+ return;
+
+ RefPtr<HTMLCollection> areas = mapElement->areas();
+ unsigned numAreas = areas->length();
+
+ // FIXME: Clip the paths to the image bounding box.
+ for (unsigned k = 0; k < numAreas; ++k) {
+ HTMLAreaElement* areaElement = static_cast<HTMLAreaElement*>(areas->item(k));
+ if (focusedNode != areaElement)
+ continue;
+
+ Vector<Path> focusRingPaths;
+ focusRingPaths.append(areaElement->getPath(this));
+ paintInfo.context->drawFocusRing(focusRingPaths, style->outlineWidth(), style->outlineOffset(), style->visitedDependentColor(CSSPropertyOutlineColor));
+ break;
+ }
+}
+
+void RenderImage::paintIntoRect(GraphicsContext* context, const IntRect& rect)
+{
+ if (!hasImage() || errorOccurred() || rect.width() <= 0 || rect.height() <= 0)
+ return;
+
+ Image* img = 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;
+ bool useLowQualityScaling = shouldPaintAtLowQuality(context, this->image(), rect.size());
+ context->drawImage(image(rect.width(), rect.height()), style()->colorSpace(), rect, compositeOperator, useLowQualityScaling);
+}
+
+int RenderImage::minimumReplacedHeight() const
+{
+ return 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.padding());
+ 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::isWidthSpecified() const
+{
+ switch (style()->width().type()) {
+ case Fixed:
+ case Percent:
+ return true;
+ case Auto:
+ case Relative: // FIXME: Shouldn't this case return true?
+ case Static:
+ case Intrinsic:
+ case MinIntrinsic:
+ return false;
+ }
+ ASSERT(false);
+ return false;
+}
+
+bool RenderImage::isHeightSpecified() const
+{
+ switch (style()->height().type()) {
+ case Fixed:
+ case Percent:
+ return true;
+ case Auto:
+ case Relative: // FIXME: Shouldn't this case return true?
+ case Static:
+ case Intrinsic:
+ case MinIntrinsic:
+ return false;
+ }
+ ASSERT(false);
+ return false;
+}
+
+int RenderImage::calcReplacedWidth(bool includeMaxWidth) const
+{
+ if (imageHasRelativeWidth())
+ if (RenderObject* cb = isPositioned() ? container() : containingBlock()) {
+ if (cb->isBox())
+ setImageContainerSize(IntSize(toRenderBox(cb)->availableWidth(), toRenderBox(cb)->availableHeight()));
+ }
+
+ int width;
+ if (isWidthSpecified())
+ width = calcReplacedWidthUsing(style()->width());
+ else if (usesImageContainerSize())
+ width = imageSize(style()->effectiveZoom()).width();
+ else if (imageHasRelativeWidth())
+ width = 0; // If the image is relatively-sized, set the width to 0 until there is a set container size.
+ else
+ width = calcAspectRatioWidth();
+
+ int minW = calcReplacedWidthUsing(style()->minWidth());
+ int maxW = !includeMaxWidth || style()->maxWidth().isUndefined() ? width : calcReplacedWidthUsing(style()->maxWidth());
+
+ return max(minW, min(width, maxW));
+}
+
+int RenderImage::calcReplacedHeight() const
+{
+ int height;
+ if (isHeightSpecified())
+ height = calcReplacedHeightUsing(style()->height());
+ else if (usesImageContainerSize())
+ height = imageSize(style()->effectiveZoom()).height();
+ else if (imageHasRelativeHeight())
+ height = 0; // If the image is relatively-sized, set the height to 0 until there is a set container size.
+ else
+ height = calcAspectRatioHeight();
+
+ int minH = calcReplacedHeightUsing(style()->minHeight());
+ int maxH = style()->maxHeight().isUndefined() ? height : calcReplacedHeightUsing(style()->maxHeight());
+
+ return max(minH, min(height, maxH));
+}
+
+int RenderImage::calcAspectRatioWidth() const
+{
+ IntSize size = intrinsicSize();
+ if (!size.height())
+ return 0;
+ if (!hasImage() || errorOccurred())
+ return size.width(); // Don't bother scaling.
+ return RenderReplaced::calcReplacedHeight() * size.width() / size.height();
+}
+
+int RenderImage::calcAspectRatioHeight() const
+{
+ IntSize size = intrinsicSize();
+ if (!size.width())
+ return 0;
+ if (!hasImage() || errorOccurred())
+ return size.height(); // Don't bother scaling.
+ return RenderReplaced::calcReplacedWidth() * size.height() / size.width();
+}
+
+void RenderImage::calcPrefWidths()
+{
+ ASSERT(prefWidthsDirty());
+
+ int borderAndPadding = borderAndPaddingWidth();
+ m_maxPrefWidth = calcReplacedWidth(false) + borderAndPadding;
+
+ if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength)
+ m_maxPrefWidth = min(m_maxPrefWidth, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? borderAndPadding : 0));
+
+ if (style()->width().isPercent() || style()->height().isPercent() ||
+ style()->maxWidth().isPercent() || style()->maxHeight().isPercent() ||
+ style()->minWidth().isPercent() || style()->minHeight().isPercent())
+ m_minPrefWidth = 0;
+ else
+ m_minPrefWidth = m_maxPrefWidth;
+
+ setPrefWidthsDirty(false);
+}
+
+Image* RenderImage::nullImage()
+{
+ return Image::nullImage();
+}
+
+} // namespace WebCore