WebKit merge 40722:40785 (part 1)

third_party/WebKit/WebCore/rendering/RenderBoxModelObject.cpp

 /*
  * Copyright (C) 2009 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 "RenderBoxModelObject.h"
 
+#include "GraphicsContext.h"
+#include "HTMLElement.h"
+#include "HTMLNames.h"
+#include "ImageBuffer.h"
 #include "RenderBlock.h"
 #include "RenderLayer.h"
 #include "RenderView.h"
 
+using namespace std;
+
 namespace WebCore {
 
+using namespace HTMLNames;
+
 bool RenderBoxModelObject::s_wasFloating = false;
 
 RenderBoxModelObject::RenderBoxModelObject(Node* node)
     : RenderObject(node)
     , m_layer(0)
 {
 }
 
 RenderBoxModelObject::~RenderBoxModelObject()
 {
@@ skipping 70 matching lines @@
     if (!style()->top().isAuto()) {
         if (!style()->top().isPercent() || containingBlock()->style()->height().isFixed())
             return style()->top().calcValue(containingBlockHeight());
     } else if (!style()->bottom().isAuto()) {
         if (!style()->bottom().isPercent() || containingBlock()->style()->height().isFixed())
             return -style()->bottom().calcValue(containingBlockHeight());
     }
     return 0;
 }
 
+int RenderBoxModelObject::offsetLeft() const
+{
+    RenderBoxModelObject* offsetPar = offsetParent();
+    if (!offsetPar)
+        return 0;
+    int xPos = (isBox() ? toRenderBox(this)->x() : 0);
+    if (offsetPar->isBox())
+        xPos -= toRenderBox(offsetPar)->borderLeft();
+    if (!isPositioned()) {
+        if (isRelPositioned())
+            xPos += relativePositionOffsetX();
+        RenderObject* curr = parent();
+        while (curr && curr != offsetPar) {
+            // FIXME: What are we supposed to do inside SVG content?
+            if (curr->isBox() && !curr->isTableRow())
+                xPos += toRenderBox(curr)->x();
+            curr = curr->parent();
+        }
+        if (offsetPar->isBox() && offsetPar->isBody() && !offsetPar->isRelPositioned() && !offsetPar->isPositioned())
+            xPos += toRenderBox(offsetPar)->x();
+    }
+    return xPos;
+}
+
+int RenderBoxModelObject::offsetTop() const
+{
+    RenderBoxModelObject* offsetPar = offsetParent();
+    if (!offsetPar)
+        return 0;
+    int yPos = (isBox() ? toRenderBox(this)->y() : 0);
+    if (offsetPar->isBox())
+        yPos -= toRenderBox(offsetPar)->borderTop();
+    if (!isPositioned()) {
+        if (isRelPositioned())
+            yPos += relativePositionOffsetY();
+        RenderObject* curr = parent();
+        while (curr && curr != offsetPar) {
+            // FIXME: What are we supposed to do inside SVG content?
+            if (curr->isBox() && !curr->isTableRow())
+                yPos += toRenderBox(curr)->y();
+            curr = curr->parent();
+        }
+        if (offsetPar->isBox() && offsetPar->isBody() && !offsetPar->isRelPositioned() && !offsetPar->isPositioned())
+            yPos += toRenderBox(offsetPar)->y();
+    }
+    return yPos;
+}
+
+int RenderBoxModelObject::paddingTop(bool) const
+{
+    int w = 0;
+    Length padding = style()->paddingTop();
+    if (padding.isPercent())
+        w = containingBlock()->availableWidth();
+    return padding.calcMinValue(w);
+}
+
+int RenderBoxModelObject::paddingBottom(bool) const
+{
+    int w = 0;
+    Length padding = style()->paddingBottom();
+    if (padding.isPercent())
+        w = containingBlock()->availableWidth();
+    return padding.calcMinValue(w);
+}
+
+int RenderBoxModelObject::paddingLeft(bool) const
+{
+    int w = 0;
+    Length padding = style()->paddingLeft();
+    if (padding.isPercent())
+        w = containingBlock()->availableWidth();
+    return padding.calcMinValue(w);
+}
+
+int RenderBoxModelObject::paddingRight(bool) const
+{
+    int w = 0;
+    Length padding = style()->paddingRight();
+    if (padding.isPercent())
+        w = containingBlock()->availableWidth();
+    return padding.calcMinValue(w);
+}
+
+
+void RenderBoxModelObject::paintFillLayerExtended(const PaintInfo& paintInfo, const Color& c, const FillLayer* bgLayer, int clipY, int clipH,
+                                                  int tx, int ty, int w, int h, InlineFlowBox* box, CompositeOperator op)
+{
+    GraphicsContext* context = paintInfo.context;
+    bool includeLeftEdge = box ? box->includeLeftEdge() : true;
+    bool includeRightEdge = box ? box->includeRightEdge() : true;
+    int bLeft = includeLeftEdge ? borderLeft() : 0;
+    int bRight = includeRightEdge ? borderRight() : 0;
+    int pLeft = includeLeftEdge ? paddingLeft() : 0;
+    int pRight = includeRightEdge ? paddingRight() : 0;
+
+    bool clippedToBorderRadius = false;
+    if (style()->hasBorderRadius() && (includeLeftEdge || includeRightEdge)) {
+        context->save();
+        context->addRoundedRectClip(IntRect(tx, ty, w, h),
+            includeLeftEdge ? style()->borderTopLeftRadius() : IntSize(),
+            includeRightEdge ? style()->borderTopRightRadius() : IntSize(),
+            includeLeftEdge ? style()->borderBottomLeftRadius() : IntSize(),
+            includeRightEdge ? style()->borderBottomRightRadius() : IntSize());
+        clippedToBorderRadius = true;
+    }
+
+    if (bgLayer->clip() == PaddingFillBox || bgLayer->clip() == ContentFillBox) {
+        // Clip to the padding or content boxes as necessary.
+        bool includePadding = bgLayer->clip() == ContentFillBox;
+        int x = tx + bLeft + (includePadding ? pLeft : 0);
+        int y = ty + borderTop() + (includePadding ? paddingTop() : 0);
+        int width = w - bLeft - bRight - (includePadding ? pLeft + pRight : 0);
+        int height = h - borderTop() - borderBottom() - (includePadding ? paddingTop() + paddingBottom() : 0);
+        context->save();
+        context->clip(IntRect(x, y, width, height));
+    } else if (bgLayer->clip() == TextFillBox) {
+        // We have to draw our text into a mask that can then be used to clip background drawing.
+        // First figure out how big the mask has to be.  It should be no bigger than what we need
+        // to actually render, so we should intersect the dirty rect with the border box of the background.
+        IntRect maskRect(tx, ty, w, h);
+        maskRect.intersect(paintInfo.rect);
+        
+        // Now create the mask.
+        auto_ptr<ImageBuffer> maskImage = ImageBuffer::create(maskRect.size(), false);
+        if (!maskImage.get())
+            return;
+        
+        GraphicsContext* maskImageContext = maskImage->context();
+        maskImageContext->translate(-maskRect.x(), -maskRect.y());
+        
+        // Now add the text to the clip.  We do this by painting using a special paint phase that signals to
+        // InlineTextBoxes that they should just add their contents to the clip.
+        PaintInfo info(maskImageContext, maskRect, PaintPhaseTextClip, true, 0, 0);
+        if (box)
+            box->paint(info, tx - box->xPos(), ty - box->yPos());
+        else
+            paint(info, tx, ty);
+            
+        // The mask has been created.  Now we just need to clip to it.
+        context->save();
+        context->clipToImageBuffer(maskRect, maskImage.get());
+    }
+    
+    StyleImage* bg = bgLayer->image();
+    bool shouldPaintBackgroundImage = bg && bg->canRender(style()->effectiveZoom());
+    Color bgColor = c;
+
+    // When this style flag is set, change existing background colors and images to a solid white background.
+    // If there's no bg color or image, leave it untouched to avoid affecting transparency.
+    // We don't try to avoid loading the background images, because this style flag is only set
+    // when printing, and at that point we've already loaded the background images anyway. (To avoid
+    // loading the background images we'd have to do this check when applying styles rather than
+    // while rendering.)
+    if (style()->forceBackgroundsToWhite()) {
+        // Note that we can't reuse this variable below because the bgColor might be changed
+        bool shouldPaintBackgroundColor = !bgLayer->next() && bgColor.isValid() && bgColor.alpha() > 0;
+        if (shouldPaintBackgroundImage || shouldPaintBackgroundColor) {
+            bgColor = Color::white;
+            shouldPaintBackgroundImage = false;
+        }
+    }
+
+    // Only fill with a base color (e.g., white) if we're the root document, since iframes/frames with
+    // no background in the child document should show the parent's background.
+    bool isTransparent = false;
+    if (!bgLayer->next() && isRoot() && !(bgColor.isValid() && bgColor.alpha() > 0) && view()->frameView()) {
+        Node* elt = document()->ownerElement();
+        if (elt) {
+            if (!elt->hasTagName(frameTag)) {
+                // Locate the <body> element using the DOM.  This is easier than trying
+                // to crawl around a render tree with potential :before/:after content and
+                // anonymous blocks created by inline <body> tags etc.  We can locate the <body>
+                // render object very easily via the DOM.
+                HTMLElement* body = document()->body();
+                isTransparent = !body || !body->hasLocalName(framesetTag); // Can't scroll a frameset document anyway.
+            }
+        } else
+            isTransparent = view()->frameView()->isTransparent();
+
+        // FIXME: This needs to be dynamic.  We should be able to go back to blitting if we ever stop being transparent.
+        if (isTransparent)
+            view()->frameView()->setUseSlowRepaints(); // The parent must show behind the child.
+    }
+
+    // Paint the color first underneath all images.
+    if (!bgLayer->next()) {
+        IntRect rect(tx, clipY, w, clipH);
+        // If we have an alpha and we are painting the root element, go ahead and blend with the base background color.
+        if (isRoot() && (!bgColor.isValid() || bgColor.alpha() < 0xFF) && !isTransparent) {
+            Color baseColor = view()->frameView()->baseBackgroundColor();
+            if (baseColor.alpha() > 0) {
+                context->save();
+                context->setCompositeOperation(CompositeCopy);
+                context->fillRect(rect, baseColor);
+                context->restore();
+            } else
+                context->clearRect(rect);
+        }
+
+        if (bgColor.isValid() && bgColor.alpha() > 0)
+            context->fillRect(rect, bgColor);
+    }
+
+    // no progressive loading of the background image
+    if (shouldPaintBackgroundImage) {
+        IntRect destRect;
+        IntPoint phase;
+        IntSize tileSize;
+
+        calculateBackgroundImageGeometry(bgLayer, tx, ty, w, h, destRect, phase, tileSize);
+        if (!destRect.isEmpty()) {
+            CompositeOperator compositeOp = op == CompositeSourceOver ? bgLayer->composite() : op;
+            context->drawTiledImage(bg->image(this, tileSize), destRect, phase, tileSize, compositeOp);
+        }
+    }
+
+    if (bgLayer->clip() != BorderFillBox)
+        // Undo the background clip
+        context->restore();
+
+    if (clippedToBorderRadius)
+        // Undo the border radius clip
+        context->restore();
+}
+
+IntSize RenderBoxModelObject::calculateBackgroundSize(const FillLayer* bgLayer, int scaledWidth, int scaledHeight) const
+{
+    StyleImage* bg = bgLayer->image();
+    bg->setImageContainerSize(IntSize(scaledWidth, scaledHeight)); // Use the box established by background-origin.
+
+    if (bgLayer->isSizeSet()) {
+        int w = scaledWidth;
+        int h = scaledHeight;
+        Length bgWidth = bgLayer->size().width();
+        Length bgHeight = bgLayer->size().height();
+
+        if (bgWidth.isFixed())
+            w = bgWidth.value();
+        else if (bgWidth.isPercent())
+            w = bgWidth.calcValue(scaledWidth);
+        
+        if (bgHeight.isFixed())
+            h = bgHeight.value();
+        else if (bgHeight.isPercent())
+            h = bgHeight.calcValue(scaledHeight);
+        
+        // If one of the values is auto we have to use the appropriate
+        // scale to maintain our aspect ratio.
+        if (bgWidth.isAuto() && !bgHeight.isAuto())
+            w = bg->imageSize(this, style()->effectiveZoom()).width() * h / bg->imageSize(this, style()->effectiveZoom()).height();        
+        else if (!bgWidth.isAuto() && bgHeight.isAuto())
+            h = bg->imageSize(this, style()->effectiveZoom()).height() * w / bg->imageSize(this, style()->effectiveZoom()).width();
+        else if (bgWidth.isAuto() && bgHeight.isAuto()) {
+            // If both width and height are auto, we just want to use the image's
+            // intrinsic size.
+            w = bg->imageSize(this, style()->effectiveZoom()).width();
+            h = bg->imageSize(this, style()->effectiveZoom()).height();
+        }
+        
+        return IntSize(max(1, w), max(1, h));
+    } else
+        return bg->imageSize(this, style()->effectiveZoom());
+}
+
+void RenderBoxModelObject::calculateBackgroundImageGeometry(const FillLayer* bgLayer, int tx, int ty, int w, int h, 
+                                                            IntRect& destRect, IntPoint& phase, IntSize& tileSize)
+{
+    int pw;
+    int ph;
+    int left = 0;
+    int right = 0;
+    int top = 0;
+    int bottom = 0;
+    int cx;
+    int cy;
+    int rw = 0;
+    int rh = 0;
+
+    // CSS2 chapter 14.2.1
+
+    if (bgLayer->attachment()) {
+        // Scroll
+        if (bgLayer->origin() != BorderFillBox) {
+            left = borderLeft();
+            right = borderRight();
+            top = borderTop();
+            bottom = borderBottom();
+            if (bgLayer->origin() == ContentFillBox) {
+                left += paddingLeft();
+                right += paddingRight();
+                top += paddingTop();
+                bottom += paddingBottom();
+            }
+        }
+        
+        // The background of the box generated by the root element covers the entire canvas including
+        // its margins.  Since those were added in already, we have to factor them out when computing the
+        // box used by background-origin/size/position.
+        if (isRoot()) {
+            rw = toRenderBox(this)->width() - left - right;
+            rh = toRenderBox(this)->height() - top - bottom; 
+            left += marginLeft();
+            right += marginRight();
+            top += marginTop();
+            bottom += marginBottom();
+        }
+        cx = tx;
+        cy = ty;
+        pw = w - left - right;
+        ph = h - top - bottom;
+    } else {
+        // Fixed
+        IntRect vr = viewRect();
+        cx = vr.x();
+        cy = vr.y();
+        pw = vr.width();
+        ph = vr.height();
+    }
+
+    int sx = 0;
+    int sy = 0;
+    int cw;
+    int ch;
+
+    IntSize scaledImageSize;
+    if (isRoot() && bgLayer->attachment())
+        scaledImageSize = calculateBackgroundSize(bgLayer, rw, rh);
+    else
+        scaledImageSize = calculateBackgroundSize(bgLayer, pw, ph);
+        
+    int scaledImageWidth = scaledImageSize.width();
+    int scaledImageHeight = scaledImageSize.height();
+
+    EFillRepeat backgroundRepeat = bgLayer->repeat();
+    
+    int xPosition;
+    if (isRoot() && bgLayer->attachment())
+        xPosition = bgLayer->xPosition().calcMinValue(rw - scaledImageWidth, true);
+    else
+        xPosition = bgLayer->xPosition().calcMinValue(pw - scaledImageWidth, true);
+    if (backgroundRepeat == RepeatFill || backgroundRepeat == RepeatXFill) {
+        cw = pw + left + right;
+        sx = scaledImageWidth ? scaledImageWidth - (xPosition + left) % scaledImageWidth : 0;
+    } else {
+        cx += max(xPosition + left, 0);
+        sx = -min(xPosition + left, 0);
+        cw = scaledImageWidth + min(xPosition + left, 0);
+    }
+    
+    int yPosition;
+    if (isRoot() && bgLayer->attachment())
+        yPosition = bgLayer->yPosition().calcMinValue(rh - scaledImageHeight, true);
+    else 
+        yPosition = bgLayer->yPosition().calcMinValue(ph - scaledImageHeight, true);
+    if (backgroundRepeat == RepeatFill || backgroundRepeat == RepeatYFill) {
+        ch = ph + top + bottom;
+        sy = scaledImageHeight ? scaledImageHeight - (yPosition + top) % scaledImageHeight : 0;
+    } else {
+        cy += max(yPosition + top, 0);
+        sy = -min(yPosition + top, 0);
+        ch = scaledImageHeight + min(yPosition + top, 0);
+    }
+
+    if (!bgLayer->attachment()) {
+        sx += max(tx - cx, 0);
+        sy += max(ty - cy, 0);
+    }
+
+    destRect = IntRect(cx, cy, cw, ch);
+    destRect.intersect(IntRect(tx, ty, w, h));
+    phase = IntPoint(sx, sy);
+    tileSize = IntSize(scaledImageWidth, scaledImageHeight);
+}
+
 } // namespace WebCore