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/*
* Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "core/rendering/shapes/Shape.h"
#include "core/css/BasicShapeFunctions.h"
#include "core/fetch/ImageResource.h"
#include "core/rendering/shapes/BoxShape.h"
#include "core/rendering/shapes/PolygonShape.h"
#include "core/rendering/shapes/RasterShape.h"
#include "core/rendering/shapes/RectangleShape.h"
#include "core/rendering/style/RenderStyle.h"
#include "platform/LengthFunctions.h"
#include "platform/geometry/FloatSize.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/ImageBuffer.h"
#include "platform/graphics/WindRule.h"
#include "wtf/MathExtras.h"
#include "wtf/OwnPtr.h"
namespace WebCore {
static PassOwnPtr<Shape> createInsetShape(const FloatRoundedRect& bounds)
{
ASSERT(bounds.rect().width() >= 0 && bounds.rect().height() >= 0);
return adoptPtr(new BoxShape(bounds));
}
static PassOwnPtr<Shape> createCircleShape(const FloatPoint& center, float radius)
{
ASSERT(radius >= 0);
return adoptPtr(new RectangleShape(FloatRect(center.x() - radius, center.y() - radius, radius*2, radius*2), FloatSize(radius, radius)));
}
static PassOwnPtr<Shape> createEllipseShape(const FloatPoint& center, const FloatSize& radii)
{
ASSERT(radii.width() >= 0 && radii.height() >= 0);
return adoptPtr(new RectangleShape(FloatRect(center.x() - radii.width(), center.y() - radii.height(), radii.width()*2, radii.height()*2), radii));
}
static PassOwnPtr<Shape> createPolygonShape(PassOwnPtr<Vector<FloatPoint> > vertices, WindRule fillRule)
{
return adoptPtr(new PolygonShape(vertices, fillRule));
}
static inline FloatRect physicalRectToLogical(const FloatRect& rect, float logicalBoxHeight, WritingMode writingMode)
{
if (isHorizontalWritingMode(writingMode))
return rect;
if (isFlippedBlocksWritingMode(writingMode))
return FloatRect(rect.y(), logicalBoxHeight - rect.maxX(), rect.height(), rect.width());
return rect.transposedRect();
}
static inline FloatPoint physicalPointToLogical(const FloatPoint& point, float logicalBoxHeight, WritingMode writingMode)
{
if (isHorizontalWritingMode(writingMode))
return point;
if (isFlippedBlocksWritingMode(writingMode))
return FloatPoint(point.y(), logicalBoxHeight - point.x());
return point.transposedPoint();
}
static inline FloatSize physicalSizeToLogical(const FloatSize& size, WritingMode writingMode)
{
if (isHorizontalWritingMode(writingMode))
return size;
return size.transposedSize();
}
PassOwnPtr<Shape> Shape::createShape(const BasicShape* basicShape, const LayoutSize& logicalBoxSize, WritingMode writingMode, float margin)
{
ASSERT(basicShape);
bool horizontalWritingMode = isHorizontalWritingMode(writingMode);
float boxWidth = horizontalWritingMode ? logicalBoxSize.width().toFloat() : logicalBoxSize.height().toFloat();
float boxHeight = horizontalWritingMode ? logicalBoxSize.height().toFloat() : logicalBoxSize.width().toFloat();
OwnPtr<Shape> shape;
switch (basicShape->type()) {
case BasicShape::BasicShapeCircleType: {
const BasicShapeCircle* circle = static_cast<const BasicShapeCircle*>(basicShape);
FloatPoint center = floatPointForCenterCoordinate(circle->centerX(), circle->centerY(), FloatSize(boxWidth, boxHeight));
float radius = circle->floatValueForRadiusInBox(FloatSize(boxWidth, boxHeight));
FloatPoint logicalCenter = physicalPointToLogical(center, logicalBoxSize.height().toFloat(), writingMode);
shape = createCircleShape(logicalCenter, radius);
break;
}
case BasicShape::BasicShapeEllipseType: {
const BasicShapeEllipse* ellipse = static_cast<const BasicShapeEllipse*>(basicShape);
FloatPoint center = floatPointForCenterCoordinate(ellipse->centerX(), ellipse->centerY(), FloatSize(boxWidth, boxHeight));
float radiusX = ellipse->floatValueForRadiusInBox(ellipse->radiusX(), center.x(), boxWidth);
float radiusY = ellipse->floatValueForRadiusInBox(ellipse->radiusY(), center.y(), boxHeight);
FloatPoint logicalCenter = physicalPointToLogical(center, logicalBoxSize.height().toFloat(), writingMode);
shape = createEllipseShape(logicalCenter, FloatSize(radiusX, radiusY));
break;
}
case BasicShape::BasicShapePolygonType: {
const BasicShapePolygon* polygon = static_cast<const BasicShapePolygon*>(basicShape);
const Vector<Length>& values = polygon->values();
size_t valuesSize = values.size();
ASSERT(!(valuesSize % 2));
OwnPtr<Vector<FloatPoint> > vertices = adoptPtr(new Vector<FloatPoint>(valuesSize / 2));
for (unsigned i = 0; i < valuesSize; i += 2) {
FloatPoint vertex(
floatValueForLength(values.at(i), boxWidth),
floatValueForLength(values.at(i + 1), boxHeight));
(*vertices)[i / 2] = physicalPointToLogical(vertex, logicalBoxSize.height().toFloat(), writingMode);
}
shape = createPolygonShape(vertices.release(), polygon->windRule());
break;
}
case BasicShape::BasicShapeInsetType: {
const BasicShapeInset& inset = *static_cast<const BasicShapeInset*>(basicShape);
float left = floatValueForLength(inset.left(), boxWidth);
float top = floatValueForLength(inset.top(), boxHeight);
float right = floatValueForLength(inset.right(), boxWidth);
float bottom = floatValueForLength(inset.bottom(), boxHeight);
FloatRect rect(left, top, std::max<float>(boxWidth - left - right, 0), std::max<float>(boxHeight - top - bottom, 0));
FloatRect logicalRect = physicalRectToLogical(rect, logicalBoxSize.height().toFloat(), writingMode);
FloatSize boxSize(boxWidth, boxHeight);
FloatSize topLeftRadius = physicalSizeToLogical(floatSizeForLengthSize(inset.topLeftRadius(), boxSize), writingMode);
FloatSize topRightRadius = physicalSizeToLogical(floatSizeForLengthSize(inset.topRightRadius(), boxSize), writingMode);
FloatSize bottomLeftRadius = physicalSizeToLogical(floatSizeForLengthSize(inset.bottomLeftRadius(), boxSize), writingMode);
FloatSize bottomRightRadius = physicalSizeToLogical(floatSizeForLengthSize(inset.bottomRightRadius(), boxSize), writingMode);
FloatRoundedRect::Radii cornerRadii(topLeftRadius, topRightRadius, bottomLeftRadius, bottomRightRadius);
cornerRadii.scale(calcBorderRadiiConstraintScaleFor(logicalRect, cornerRadii));
shape = createInsetShape(FloatRoundedRect(logicalRect, cornerRadii));
break;
}
default:
ASSERT_NOT_REACHED();
}
shape->m_writingMode = writingMode;
shape->m_margin = margin;
return shape.release();
}
PassOwnPtr<Shape> Shape::createRasterShape(Image* image, float threshold, const LayoutRect& imageR, const LayoutRect& marginR, WritingMode writingMode, float margin)
{
IntRect imageRect = pixelSnappedIntRect(imageR);
IntRect marginRect = pixelSnappedIntRect(marginR);
OwnPtr<RasterShapeIntervals> intervals = adoptPtr(new RasterShapeIntervals(marginRect.height(), -marginRect.y()));
OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(imageRect.size());
if (imageBuffer) {
GraphicsContext* graphicsContext = imageBuffer->context();
graphicsContext->drawImage(image, IntRect(IntPoint(), imageRect.size()));
RefPtr<Uint8ClampedArray> pixelArray = imageBuffer->getUnmultipliedImageData(IntRect(IntPoint(), imageRect.size()));
unsigned pixelArrayOffset = 3; // Each pixel is four bytes: RGBA.
uint8_t alphaPixelThreshold = threshold * 255;
ASSERT(static_cast<unsigned>(imageRect.width() * imageRect.height() * 4) == pixelArray->length());
int minBufferY = std::max(0, marginRect.y() - imageRect.y());
int maxBufferY = std::min(imageRect.height(), marginRect.maxY() - imageRect.y());
for (int y = minBufferY; y < maxBufferY; ++y) {
int startX = -1;
for (int x = 0; x < imageRect.width(); ++x, pixelArrayOffset += 4) {
uint8_t alpha = pixelArray->item(pixelArrayOffset);
bool alphaAboveThreshold = alpha > alphaPixelThreshold;
if (startX == -1 && alphaAboveThreshold) {
startX = x;
} else if (startX != -1 && (!alphaAboveThreshold || x == imageRect.width() - 1)) {
int endX = alphaAboveThreshold ? x + 1 : x;
intervals->intervalAt(y + imageRect.y()).unite(IntShapeInterval(startX + imageRect.x(), endX + imageRect.x()));
startX = -1;
}
}
}
}
OwnPtr<RasterShape> rasterShape = adoptPtr(new RasterShape(intervals.release(), marginRect.size()));
rasterShape->m_writingMode = writingMode;
rasterShape->m_margin = margin;
return rasterShape.release();
}
PassOwnPtr<Shape> Shape::createLayoutBoxShape(const RoundedRect& roundedRect, WritingMode writingMode, float margin)
{
FloatRect rect(0, 0, roundedRect.rect().width(), roundedRect.rect().height());
FloatRoundedRect bounds(rect, roundedRect.radii());
OwnPtr<Shape> shape = createInsetShape(bounds);
shape->m_writingMode = writingMode;
shape->m_margin = margin;
return shape.release();
}
} // namespace WebCore
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