| /* |
| * 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 Apple 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 "Document.h" |
| #include "GraphicsContext.h" |
| #include "HTMLImageElement.h" |
| #include "HTMLInputElement.h" |
| #include "HTMLMapElement.h" |
| #include "HTMLNames.h" |
| #include "HitTestResult.h" |
| #include "Page.h" |
| #include "RenderView.h" |
| #ifdef ANDROID_LAYOUT |
| #include "Settings.h" |
| #endif |
| |
| #include "SystemTime.h" |
| |
| using namespace std; |
| |
| namespace WebCore { |
| |
| static const double cInterpolationCutoff = 800. * 800.; |
| static const double cLowQualityTimeThreshold = 0.050; // 50 ms |
| |
| class RenderImageScaleData { |
| public: |
| RenderImageScaleData(RenderImage* image, const IntSize& size, double time, bool lowQualityScale) |
| : m_size(size) |
| , m_time(time) |
| , m_lowQualityScale(lowQualityScale) |
| , m_highQualityRepaintTimer(image, &RenderImage::highQualityRepaintTimerFired) |
| { |
| } |
| |
| ~RenderImageScaleData() |
| { |
| m_highQualityRepaintTimer.stop(); |
| } |
| |
| const IntSize& size() const { return m_size; } |
| double time() const { return m_time; } |
| bool useLowQualityScale() const { return m_lowQualityScale; } |
| Timer<RenderImage>& hiqhQualityRepaintTimer() { return m_highQualityRepaintTimer; } |
| |
| void setSize(const IntSize& s) { m_size = s; } |
| void setTime(double t) { m_time = t; } |
| void setUseLowQualityScale(bool b) |
| { |
| m_highQualityRepaintTimer.stop(); |
| m_lowQualityScale = b; |
| if (b) |
| m_highQualityRepaintTimer.startOneShot(cLowQualityTimeThreshold); |
| } |
| |
| private: |
| IntSize m_size; |
| double m_time; |
| bool m_lowQualityScale; |
| Timer<RenderImage> m_highQualityRepaintTimer; |
| }; |
| |
| class RenderImageScaleObserver |
| { |
| public: |
| static bool shouldImagePaintAtLowQuality(RenderImage*, const IntSize&); |
| |
| static void imageDestroyed(RenderImage* image) |
| { |
| if (gImages) { |
| RenderImageScaleData* data = gImages->take(image); |
| delete data; |
| if (gImages->size() == 0) { |
| delete gImages; |
| gImages = 0; |
| } |
| } |
| } |
| |
| static void highQualityRepaintTimerFired(RenderImage* image) |
| { |
| RenderImageScaleObserver::imageDestroyed(image); |
| image->repaint(); |
| } |
| |
| static HashMap<RenderImage*, RenderImageScaleData*>* gImages; |
| }; |
| |
| bool RenderImageScaleObserver::shouldImagePaintAtLowQuality(RenderImage* image, const IntSize& size) |
| { |
| // If the image is not a bitmap image, then none of this is relevant and we just paint at high |
| // quality. |
| if (!image->image() || !image->image()->isBitmapImage()) |
| return false; |
| |
| // Make sure to use the unzoomed image size, since if a full page zoom is in effect, the image |
| // is actually being scaled. |
| IntSize imageSize(image->image()->width(), image->image()->height()); |
| |
| // Look ourselves up in the hashtable. |
| RenderImageScaleData* data = 0; |
| if (gImages) |
| data = gImages->get(image); |
| |
| if (imageSize == size) { |
| // There is no scale in effect. If we had a scale in effect before, we can just delete this data. |
| if (data) { |
| gImages->remove(image); |
| delete data; |
| } |
| return false; |
| } |
| |
| // There is no need to hash scaled images that always use low quality mode when the page demands it. This is the iChat case. |
| if (image->document()->page()->inLowQualityImageInterpolationMode()) { |
| double totalPixels = static_cast<double>(image->image()->width()) * static_cast<double>(image->image()->height()); |
| if (totalPixels > cInterpolationCutoff) |
| return true; |
| } |
| |
| // If there is no data yet, we will paint the first scale at high quality and record the paint time in case a second scale happens |
| // very soon. |
| if (!data) { |
| data = new RenderImageScaleData(image, size, currentTime(), false); |
| if (!gImages) |
| gImages = new HashMap<RenderImage*, RenderImageScaleData*>; |
| gImages->set(image, data); |
| return false; |
| } |
| |
| // We are scaled, but we painted already at this size, so just keep using whatever mode we last painted with. |
| if (data->size() == size) |
| return data->useLowQualityScale(); |
| |
| // We have data and our size just changed. If this change happened quickly, go into low quality mode and then set a repaint |
| // timer to paint in high quality mode. Otherwise it is ok to just paint in high quality mode. |
| double newTime = currentTime(); |
| data->setUseLowQualityScale(newTime - data->time() < cLowQualityTimeThreshold); |
| data->setTime(newTime); |
| data->setSize(size); |
| return data->useLowQualityScale(); |
| } |
| |
| HashMap<RenderImage*, RenderImageScaleData*>* RenderImageScaleObserver::gImages = 0; |
| |
| void RenderImage::highQualityRepaintTimerFired(Timer<RenderImage>* timer) |
| { |
| RenderImageScaleObserver::highQualityRepaintTimerFired(this); |
| } |
| |
| using namespace HTMLNames; |
| |
| RenderImage::RenderImage(Node* node) |
| : RenderReplaced(node, IntSize(0, 0)) |
| , m_cachedImage(0) |
| { |
| updateAltText(); |
| } |
| |
| RenderImage::~RenderImage() |
| { |
| if (m_cachedImage) |
| m_cachedImage->removeClient(this); |
| RenderImageScaleObserver::imageDestroyed(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) { |
| // 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) |
| { |
| if (documentBeingDestroyed()) |
| return; |
| |
| if (hasBoxDecorations() || hasMask()) |
| RenderReplaced::imageChanged(newImage); |
| |
| 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 = m_width; |
| int oldheight = m_height; |
| if (!prefWidthsDirty()) |
| setPrefWidthsDirty(true); |
| calcWidth(); |
| calcHeight(); |
| |
| if (imageSizeChanged || m_width != oldwidth || m_height != oldheight) { |
| shouldRepaint = false; |
| if (!selfNeedsLayout()) |
| setNeedsLayout(true); |
| } |
| |
| m_width = oldwidth; |
| m_height = oldheight; |
| } |
| } |
| |
| if (shouldRepaint) { |
| // FIXME: We always just do a complete repaint, since we always pass in the full image |
| // rect at the moment anyway. |
| repaintRectangle(contentBox()); |
| } |
| } |
| |
| 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); |
| context->setFillColor(Color::transparent); |
| 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(), IntPoint(tx + imageX, ty + imageY)); |
| errorPictureDrawn = true; |
| } |
| |
| if (!m_altText.isEmpty()) { |
| String text = m_altText; |
| text.replace('\\', backslashAsCurrencySymbol()); |
| context->setFont(style()->font()); |
| context->setFillColor(style()->color()); |
| 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(textRun, IntPoint(ax, ay + ascent)); |
| } else if (usableWidth >= textWidth && cHeight >= font.height()) |
| context->drawText(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 - m_x, ty - m_y, style()->highlight(), true); |
| #endif |
| |
| IntSize contentSize(cWidth, cHeight); |
| bool useLowQualityScaling = RenderImageScaleObserver::shouldImagePaintAtLowQuality(this, contentSize); |
| IntRect rect(IntPoint(tx + leftBorder + leftPad, ty + topBorder + topPad), contentSize); |
| HTMLImageElement* imageElt = (element() && element()->hasTagName(imgTag)) ? static_cast<HTMLImageElement*>(element()) : 0; |
| CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver; |
| context->drawImage(image(cWidth, cHeight), rect, compositeOperator, useLowQualityScaling); |
| } |
| } |
| |
| int RenderImage::minimumReplacedHeight() const |
| { |
| return errorOccurred() ? intrinsicSize().height() : 0; |
| } |
| |
| HTMLMapElement* RenderImage::imageMap() |
| { |
| HTMLImageElement* i = element() && element()->hasTagName(imgTag) ? static_cast<HTMLImageElement*>(element()) : 0; |
| return i ? i->document()->getImageMap(i->useMap()) : 0; |
| } |
| |
| bool RenderImage::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction) |
| { |
| bool inside = RenderReplaced::nodeAtPoint(request, result, _x, _y, _tx, _ty, hitTestAction); |
| |
| if (inside && element()) { |
| int tx = _tx + m_x; |
| int ty = _ty + m_y; |
| |
| HTMLMapElement* map = imageMap(); |
| if (map) { |
| // we're a client side image map |
| inside = map->mapMouseEvent(_x - tx, _y - ty, IntSize(contentWidth(), contentHeight()), result); |
| result.setInnerNonSharedNode(element()); |
| } |
| } |
| |
| return inside; |
| } |
| |
| void RenderImage::updateAltText() |
| { |
| if (!element()) |
| return; |
| |
| if (element()->hasTagName(inputTag)) |
| m_altText = static_cast<HTMLInputElement*>(element())->altText(); |
| else if (element()->hasTagName(imgTag)) |
| m_altText = static_cast<HTMLImageElement*>(element())->altText(); |
| } |
| |
| 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()) |
| setImageContainerSize(IntSize(cb->availableWidth(), 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()); |
| |
| #ifdef ANDROID_LAYOUT |
| width = max(minW, min(width, maxW)); |
| // in SSR mode, we will fit the image to its container width |
| if (document()->settings()->layoutAlgorithm() == Settings::kLayoutSSR) { |
| int cw = containingBlockWidth(); |
| if (cw && width>cw) |
| width = cw; |
| } |
| return width; |
| #else |
| return max(minW, min(width, maxW)); |
| #endif |
| } |
| |
| 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()); |
| |
| #ifdef ANDROID_LAYOUT |
| height = max(minH, min(height, maxH)); |
| // in SSR mode, we will fit the image to its container width |
| if (height && document()->settings()->layoutAlgorithm() == Settings::kLayoutSSR) { |
| int width; |
| if (isWidthSpecified()) |
| width = calcReplacedWidthUsing(style()->width()); |
| else |
| width = calcAspectRatioWidth(); |
| int minW = calcReplacedWidthUsing(style()->minWidth()); |
| int maxW = style()->maxWidth().value() == undefinedLength ? width : |
| calcReplacedWidthUsing(style()->maxWidth()); |
| width = max(minW, min(width, maxW)); |
| |
| int cw = containingBlockWidth(); |
| if (cw && width && width>cw) |
| height = cw * height / width; // preserve aspect ratio |
| } |
| return height; |
| #else |
| return max(minH, min(height, maxH)); |
| #endif |
| } |
| |
| 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 paddingAndBorders = paddingLeft() + paddingRight() + borderLeft() + borderRight(); |
| m_maxPrefWidth = calcReplacedWidth(false) + paddingAndBorders; |
| |
| if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) |
| m_maxPrefWidth = min(m_maxPrefWidth, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? paddingAndBorders : 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 |
