src/third_party/WebKit/Source/core/rendering/shapes/ShapeOutsideInfo.cpp

   1 /*
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   3  *
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   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above
   9  *    copyright notice, this list of conditions and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above
  12  *    copyright notice, this list of conditions and the following
  13  *    disclaimer in the documentation and/or other materials
  14  *    provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
  17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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  26  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include "config.h"
  31 #include "core/rendering/shapes/ShapeOutsideInfo.h"
  32
  33 #include "core/inspector/ConsoleMessage.h"
  34 #include "core/rendering/FloatingObjects.h"
  35 #include "core/rendering/RenderBlockFlow.h"
  36 #include "core/rendering/RenderBox.h"
  37 #include "core/rendering/RenderImage.h"
  38 #include "platform/LengthFunctions.h"
  39 #include "public/platform/Platform.h"
  40
  41 namespace blink {
  42
  43 CSSBoxType referenceBox(const ShapeValue& shapeValue)
  44 {
  45     if (shapeValue.cssBox() == BoxMissing)
  46         return MarginBox;
  47     return shapeValue.cssBox();
  48 }
  49
  50 void ShapeOutsideInfo::setReferenceBoxLogicalSize(LayoutSize newReferenceBoxLogicalSize)
  51 {
  52     bool isHorizontalWritingMode = m_renderer.containingBlock()->style()->isHorizontalWritingMode();
  53     switch (referenceBox(*m_renderer.style()->shapeOutside())) {
  54     case MarginBox:
  55         if (isHorizontalWritingMode)
  56             newReferenceBoxLogicalSize.expand(m_renderer.marginWidth(), m_renderer.marginHeight());
  57         else
  58             newReferenceBoxLogicalSize.expand(m_renderer.marginHeight(), m_renderer.marginWidth());
  59         break;
  60     case BorderBox:
  61         break;
  62     case PaddingBox:
  63         if (isHorizontalWritingMode)
  64             newReferenceBoxLogicalSize.shrink(m_renderer.borderWidth(), m_renderer.borderHeight());
  65         else
  66             newReferenceBoxLogicalSize.shrink(m_renderer.borderHeight(), m_renderer.borderWidth());
  67         break;
  68     case ContentBox:
  69         if (isHorizontalWritingMode)
  70             newReferenceBoxLogicalSize.shrink(m_renderer.borderAndPaddingWidth(), m_renderer.borderAndPaddingHeight());
  71         else
  72             newReferenceBoxLogicalSize.shrink(m_renderer.borderAndPaddingHeight(), m_renderer.borderAndPaddingWidth());
  73         break;
  74     case BoxMissing:
  75         ASSERT_NOT_REACHED();
  76         break;
  77     }
  78
  79     if (m_referenceBoxLogicalSize == newReferenceBoxLogicalSize)
  80         return;
  81     markShapeAsDirty();
  82     m_referenceBoxLogicalSize = newReferenceBoxLogicalSize;
  83 }
  84
  85 static bool checkShapeImageOrigin(Document& document, const StyleImage& styleImage)
  86 {
  87     if (styleImage.isGeneratedImage())
  88         return true;
  89
  90     ASSERT(styleImage.cachedImage());
  91     ImageResource& imageResource = *(styleImage.cachedImage());
  92     if (imageResource.isAccessAllowed(document.securityOrigin()))
  93         return true;
  94
  95     const KURL& url = imageResource.url();
  96     String urlString = url.isNull() ? "''" : url.elidedString();
  97     document.addConsoleMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Unsafe attempt to load URL " + urlString + "."));
  98
  99     return false;
 100 }
 101
 102 static LayoutRect getShapeImageMarginRect(const RenderBox& renderBox, const LayoutSize& referenceBoxLogicalSize)
 103 {
 104     LayoutPoint marginBoxOrigin(-renderBox.marginLogicalLeft() - renderBox.borderAndPaddingLogicalLeft(), -renderBox.marginBefore() - renderBox.borderBefore() - renderBox.paddingBefore());
 105     LayoutSize marginBoxSizeDelta(renderBox.marginLogicalWidth() + renderBox.borderAndPaddingLogicalWidth(), renderBox.marginLogicalHeight() + renderBox.borderAndPaddingLogicalHeight());
 106     return LayoutRect(marginBoxOrigin, referenceBoxLogicalSize + marginBoxSizeDelta);
 107 }
 108
 109 static bool isValidRasterShapeRect(const LayoutRect& rect)
 110 {
 111     static double maxImageSizeBytes = 0;
 112     if (!maxImageSizeBytes) {
 113         size_t size32MaxBytes =  0xFFFFFFFF / 4; // Some platforms don't limit maxDecodedImageBytes.
 114         maxImageSizeBytes = std::min(size32MaxBytes, Platform::current()->maxDecodedImageBytes());
 115     }
 116     return (rect.width().toFloat() * rect.height().toFloat() * 4.0) < maxImageSizeBytes;
 117 }
 118
 119 PassOwnPtr<Shape> ShapeOutsideInfo::createShapeForImage(StyleImage* styleImage, float shapeImageThreshold, WritingMode writingMode, float margin) const
 120 {
 121     const IntSize& imageSize = m_renderer.calculateImageIntrinsicDimensions(styleImage, roundedIntSize(m_referenceBoxLogicalSize), RenderImage::ScaleByEffectiveZoom);
 122     styleImage->setContainerSizeForRenderer(&m_renderer, imageSize, m_renderer.style()->effectiveZoom());
 123
 124     const LayoutRect& marginRect = getShapeImageMarginRect(m_renderer, m_referenceBoxLogicalSize);
 125     const LayoutRect& imageRect = (m_renderer.isRenderImage())
 126         ? toRenderImage(m_renderer).replacedContentRect()
 127         : LayoutRect(LayoutPoint(), imageSize);
 128
 129     if (!isValidRasterShapeRect(marginRect) || !isValidRasterShapeRect(imageRect)) {
 130         m_renderer.document().addConsoleMessage(ConsoleMessage::create(RenderingMessageSource, ErrorMessageLevel, "The shape-outside image is too large."));
 131         return Shape::createEmptyRasterShape(writingMode, margin);
 132     }
 133
 134     ASSERT(!styleImage->isPendingImage());
 135     RefPtr<Image> image = styleImage->image(const_cast<RenderBox*>(&m_renderer), imageSize);
 136
 137     return Shape::createRasterShape(image.get(), shapeImageThreshold, imageRect, marginRect, writingMode, margin);
 138 }
 139
 140 const Shape& ShapeOutsideInfo::computedShape() const
 141 {
 142     if (Shape* shape = m_shape.get())
 143         return *shape;
 144
 145     const RenderStyle& style = *m_renderer.style();
 146     ASSERT(m_renderer.containingBlock());
 147     const RenderStyle& containingBlockStyle = *m_renderer.containingBlock()->style();
 148
 149     WritingMode writingMode = containingBlockStyle.writingMode();
 150     LayoutUnit maximumValue = m_renderer.containingBlock() ? m_renderer.containingBlock()->contentWidth() : LayoutUnit();
 151     float margin = floatValueForLength(m_renderer.style()->shapeMargin(), maximumValue.toFloat());
 152
 153     float shapeImageThreshold = style.shapeImageThreshold();
 154     ASSERT(style.shapeOutside());
 155     const ShapeValue& shapeValue = *style.shapeOutside();
 156
 157     switch (shapeValue.type()) {
 158     case ShapeValue::Shape:
 159         ASSERT(shapeValue.shape());
 160         m_shape = Shape::createShape(shapeValue.shape(), m_referenceBoxLogicalSize, writingMode, margin);
 161         break;
 162     case ShapeValue::Image:
 163         ASSERT(shapeValue.isImageValid());
 164         m_shape = createShapeForImage(shapeValue.image(), shapeImageThreshold, writingMode, margin);
 165         break;
 166     case ShapeValue::Box: {
 167         const RoundedRect& shapeRect = style.getRoundedBorderFor(LayoutRect(LayoutPoint(), m_referenceBoxLogicalSize), m_renderer.view());
 168         m_shape = Shape::createLayoutBoxShape(shapeRect, writingMode, margin);
 169         break;
 170     }
 171     }
 172
 173     ASSERT(m_shape);
 174     return *m_shape;
 175 }
 176
 177 inline LayoutUnit borderBeforeInWritingMode(const RenderBox& renderer, WritingMode writingMode)
 178 {
 179     switch (writingMode) {
 180     case TopToBottomWritingMode: return renderer.borderTop();
 181     case BottomToTopWritingMode: return renderer.borderBottom();
 182     case LeftToRightWritingMode: return renderer.borderLeft();
 183     case RightToLeftWritingMode: return renderer.borderRight();
 184     }
 185
 186     ASSERT_NOT_REACHED();
 187     return renderer.borderBefore();
 188 }
 189
 190 inline LayoutUnit borderAndPaddingBeforeInWritingMode(const RenderBox& renderer, WritingMode writingMode)
 191 {
 192     switch (writingMode) {
 193     case TopToBottomWritingMode: return renderer.borderTop() + renderer.paddingTop();
 194     case BottomToTopWritingMode: return renderer.borderBottom() + renderer.paddingBottom();
 195     case LeftToRightWritingMode: return renderer.borderLeft() + renderer.paddingLeft();
 196     case RightToLeftWritingMode: return renderer.borderRight() + renderer.paddingRight();
 197     }
 198
 199     ASSERT_NOT_REACHED();
 200     return renderer.borderAndPaddingBefore();
 201 }
 202
 203 LayoutUnit ShapeOutsideInfo::logicalTopOffset() const
 204 {
 205     switch (referenceBox(*m_renderer.style()->shapeOutside())) {
 206     case MarginBox: return -m_renderer.marginBefore(m_renderer.containingBlock()->style());
 207     case BorderBox: return LayoutUnit();
 208     case PaddingBox: return borderBeforeInWritingMode(m_renderer, m_renderer.containingBlock()->style()->writingMode());
 209     case ContentBox: return borderAndPaddingBeforeInWritingMode(m_renderer, m_renderer.containingBlock()->style()->writingMode());
 210     case BoxMissing: break;
 211     }
 212
 213     ASSERT_NOT_REACHED();
 214     return LayoutUnit();
 215 }
 216
 217 inline LayoutUnit borderStartWithStyleForWritingMode(const RenderBox& renderer, const RenderStyle* style)
 218 {
 219     if (style->isHorizontalWritingMode()) {
 220         if (style->isLeftToRightDirection())
 221             return renderer.borderLeft();
 222
 223         return renderer.borderRight();
 224     }
 225     if (style->isLeftToRightDirection())
 226         return renderer.borderTop();
 227
 228     return renderer.borderBottom();
 229 }
 230
 231 inline LayoutUnit borderAndPaddingStartWithStyleForWritingMode(const RenderBox& renderer, const RenderStyle* style)
 232 {
 233     if (style->isHorizontalWritingMode()) {
 234         if (style->isLeftToRightDirection())
 235             return renderer.borderLeft() + renderer.paddingLeft();
 236
 237         return renderer.borderRight() + renderer.paddingRight();
 238     }
 239     if (style->isLeftToRightDirection())
 240         return renderer.borderTop() + renderer.paddingTop();
 241
 242     return renderer.borderBottom() + renderer.paddingBottom();
 243 }
 244
 245 LayoutUnit ShapeOutsideInfo::logicalLeftOffset() const
 246 {
 247     switch (referenceBox(*m_renderer.style()->shapeOutside())) {
 248     case MarginBox: return -m_renderer.marginStart(m_renderer.containingBlock()->style());
 249     case BorderBox: return LayoutUnit();
 250     case PaddingBox: return borderStartWithStyleForWritingMode(m_renderer, m_renderer.containingBlock()->style());
 251     case ContentBox: return borderAndPaddingStartWithStyleForWritingMode(m_renderer, m_renderer.containingBlock()->style());
 252     case BoxMissing: break;
 253     }
 254
 255     ASSERT_NOT_REACHED();
 256     return LayoutUnit();
 257 }
 258
 259
 260 bool ShapeOutsideInfo::isEnabledFor(const RenderBox& box)
 261 {
 262     ShapeValue* shapeValue = box.style()->shapeOutside();
 263     if (!box.isFloating() || !shapeValue)
 264         return false;
 265
 266     switch (shapeValue->type()) {
 267     case ShapeValue::Shape:
 268         return shapeValue->shape();
 269     case ShapeValue::Image:
 270         return shapeValue->isImageValid() && checkShapeImageOrigin(box.document(), *(shapeValue->image()));
 271     case ShapeValue::Box:
 272         return true;
 273     }
 274
 275     return false;
 276 }
 277 ShapeOutsideDeltas ShapeOutsideInfo::computeDeltasForContainingBlockLine(const RenderBlockFlow& containingBlock, const FloatingObject& floatingObject, LayoutUnit lineTop, LayoutUnit lineHeight)
 278 {
 279     ASSERT(lineHeight >= 0);
 280
 281     LayoutUnit borderBoxTop = containingBlock.logicalTopForFloat(&floatingObject) + containingBlock.marginBeforeForChild(&m_renderer);
 282     LayoutUnit borderBoxLineTop = lineTop - borderBoxTop;
 283
 284     if (isShapeDirty() || !m_shapeOutsideDeltas.isForLine(borderBoxLineTop, lineHeight)) {
 285         LayoutUnit referenceBoxLineTop = borderBoxLineTop - logicalTopOffset();
 286         LayoutUnit floatMarginBoxWidth = containingBlock.logicalWidthForFloat(&floatingObject);
 287
 288         if (computedShape().lineOverlapsShapeMarginBounds(referenceBoxLineTop, lineHeight)) {
 289             LineSegment segment = computedShape().getExcludedInterval((borderBoxLineTop - logicalTopOffset()), std::min(lineHeight, shapeLogicalBottom() - borderBoxLineTop));
 290             if (segment.isValid) {
 291                 LayoutUnit logicalLeftMargin = containingBlock.style()->isLeftToRightDirection() ? containingBlock.marginStartForChild(&m_renderer) : containingBlock.marginEndForChild(&m_renderer);
 292                 LayoutUnit rawLeftMarginBoxDelta = segment.logicalLeft + logicalLeftOffset() + logicalLeftMargin;
 293                 LayoutUnit leftMarginBoxDelta = clampTo<LayoutUnit>(rawLeftMarginBoxDelta, LayoutUnit(), floatMarginBoxWidth);
 294
 295                 LayoutUnit logicalRightMargin = containingBlock.style()->isLeftToRightDirection() ? containingBlock.marginEndForChild(&m_renderer) : containingBlock.marginStartForChild(&m_renderer);
 296                 LayoutUnit rawRightMarginBoxDelta = segment.logicalRight + logicalLeftOffset() - containingBlock.logicalWidthForChild(&m_renderer) - logicalRightMargin;
 297                 LayoutUnit rightMarginBoxDelta = clampTo<LayoutUnit>(rawRightMarginBoxDelta, -floatMarginBoxWidth, LayoutUnit());
 298
 299                 m_shapeOutsideDeltas = ShapeOutsideDeltas(leftMarginBoxDelta, rightMarginBoxDelta, true, borderBoxLineTop, lineHeight);
 300                 return m_shapeOutsideDeltas;
 301             }
 302         }
 303
 304         // Lines that do not overlap the shape should act as if the float
 305         // wasn't there for layout purposes. So we set the deltas to remove the
 306         // entire width of the float.
 307         m_shapeOutsideDeltas = ShapeOutsideDeltas(floatMarginBoxWidth, -floatMarginBoxWidth, false, borderBoxLineTop, lineHeight);
 308     }
 309
 310     return m_shapeOutsideDeltas;
 311 }
 312
 313 LayoutRect ShapeOutsideInfo::computedShapePhysicalBoundingBox() const
 314 {
 315     LayoutRect physicalBoundingBox = computedShape().shapeMarginLogicalBoundingBox();
 316     physicalBoundingBox.setX(physicalBoundingBox.x() + logicalLeftOffset());
 317
 318     if (m_renderer.style()->isFlippedBlocksWritingMode())
 319         physicalBoundingBox.setY(m_renderer.logicalHeight() - physicalBoundingBox.maxY());
 320     else
 321         physicalBoundingBox.setY(physicalBoundingBox.y() + logicalTopOffset());
 322
 323     if (!m_renderer.style()->isHorizontalWritingMode())
 324         physicalBoundingBox = physicalBoundingBox.transposedRect();
 325     else
 326         physicalBoundingBox.setY(physicalBoundingBox.y() + logicalTopOffset());
 327
 328     return physicalBoundingBox;
 329 }
 330
 331 FloatPoint ShapeOutsideInfo::shapeToRendererPoint(FloatPoint point) const
 332 {
 333     FloatPoint result = FloatPoint(point.x() + logicalLeftOffset(), point.y() + logicalTopOffset());
 334     if (m_renderer.style()->isFlippedBlocksWritingMode())
 335         result.setY(m_renderer.logicalHeight() - result.y());
 336     if (!m_renderer.style()->isHorizontalWritingMode())
 337         result = result.transposedPoint();
 338     return result;
 339 }
 340
 341 FloatSize ShapeOutsideInfo::shapeToRendererSize(FloatSize size) const
 342 {
 343     if (!m_renderer.style()->isHorizontalWritingMode())
 344         return size.transposedSize();
 345     return size;
 346 }
 347
 348 } // namespace blink