blob: c97795f10a2f5ab13f0761818984eb5964858acd [file] [log] [blame]
/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003-2017 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 "NinePieceImage.h"
#include "GraphicsContext.h"
#include "ImageQualityController.h"
#include "LengthFunctions.h"
#include "RenderStyle.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/PointerComparison.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
inline DataRef<NinePieceImage::Data>& NinePieceImage::defaultData()
{
static NeverDestroyed<DataRef<Data>> data { Data::create() };
return data.get();
}
NinePieceImage::NinePieceImage()
: m_data(defaultData())
{
}
NinePieceImage::NinePieceImage(RefPtr<StyleImage>&& image, LengthBox imageSlices, bool fill, LengthBox borderSlices, LengthBox outset, ENinePieceImageRule horizontalRule, ENinePieceImageRule verticalRule)
: m_data(Data::create(WTFMove(image), imageSlices, fill, borderSlices, outset, horizontalRule, verticalRule))
{
}
LayoutUnit NinePieceImage::computeSlice(Length length, LayoutUnit width, LayoutUnit slice, LayoutUnit extent)
{
if (length.isRelative())
return length.value() * width;
if (length.isAuto())
return slice;
return valueForLength(length, extent);
}
LayoutBoxExtent NinePieceImage::computeSlices(const LayoutSize& size, const LengthBox& lengths, int scaleFactor)
{
return {
std::min(size.height(), valueForLength(lengths.top(), size.height())) * scaleFactor,
std::min(size.width(), valueForLength(lengths.right(), size.width())) * scaleFactor,
std::min(size.height(), valueForLength(lengths.bottom(), size.height())) * scaleFactor,
std::min(size.width(), valueForLength(lengths.left(), size.width())) * scaleFactor
};
}
LayoutBoxExtent NinePieceImage::computeSlices(const LayoutSize& size, const LengthBox& lengths, const FloatBoxExtent& widths, const LayoutBoxExtent& slices)
{
return {
computeSlice(lengths.top(), widths.top(), slices.top(), size.height()),
computeSlice(lengths.right(), widths.right(), slices.right(), size.width()),
computeSlice(lengths.bottom(), widths.bottom(), slices.bottom(), size.height()),
computeSlice(lengths.left(), widths.left(), slices.left(), size.width())
};
}
void NinePieceImage::scaleSlicesIfNeeded(const LayoutSize& size, LayoutBoxExtent& slices, float deviceScaleFactor)
{
LayoutUnit width = std::max<LayoutUnit>(1 / deviceScaleFactor, slices.left() + slices.right());
LayoutUnit height = std::max<LayoutUnit>(1 / deviceScaleFactor, slices.top() + slices.bottom());
float sliceScaleFactor = std::min((float)size.width() / width, (float)size.height() / height);
if (sliceScaleFactor >= 1)
return;
// All slices are reduced by multiplying them by sliceScaleFactor.
slices.top() *= sliceScaleFactor;
slices.right() *= sliceScaleFactor;
slices.bottom() *= sliceScaleFactor;
slices.left() *= sliceScaleFactor;
}
bool NinePieceImage::isEmptyPieceRect(ImagePiece piece, const LayoutBoxExtent& slices)
{
if (piece == MiddlePiece)
return false;
auto horizontalSide = imagePieceHorizontalSide(piece);
auto verticalSide = imagePieceVerticalSide(piece);
return !((!horizontalSide || slices.at(*horizontalSide)) && (!verticalSide || slices.at(*verticalSide)));
}
bool NinePieceImage::isEmptyPieceRect(ImagePiece piece, const Vector<FloatRect>& destinationRects, const Vector<FloatRect>& sourceRects)
{
return destinationRects[piece].isEmpty() || sourceRects[piece].isEmpty();
}
Vector<FloatRect> NinePieceImage::computeNineRects(const FloatRect& outer, const LayoutBoxExtent& slices, float deviceScaleFactor)
{
FloatRect inner = outer;
inner.move(slices.left(), slices.top());
inner.contract(slices.left() + slices.right(), slices.top() + slices.bottom());
ASSERT(outer.contains(inner));
Vector<FloatRect> rects(MaxPiece);
rects[TopLeftPiece] = snapRectToDevicePixels(outer.x(), outer.y(), slices.left(), slices.top(), deviceScaleFactor);
rects[BottomLeftPiece] = snapRectToDevicePixels(outer.x(), inner.maxY(), slices.left(), slices.bottom(), deviceScaleFactor);
rects[LeftPiece] = snapRectToDevicePixels(outer.x(), inner.y(), slices.left(), inner.height(), deviceScaleFactor);
rects[TopRightPiece] = snapRectToDevicePixels(inner.maxX(), outer.y(), slices.right(), slices.top(), deviceScaleFactor);
rects[BottomRightPiece] = snapRectToDevicePixels(inner.maxX(), inner.maxY(), slices.right(), slices.bottom(), deviceScaleFactor);
rects[RightPiece] = snapRectToDevicePixels(inner.maxX(), inner.y(), slices.right(), inner.height(), deviceScaleFactor);
rects[TopPiece] = snapRectToDevicePixels(inner.x(), outer.y(), inner.width(), slices.top(), deviceScaleFactor);
rects[BottomPiece] = snapRectToDevicePixels(inner.x(), inner.maxY(), inner.width(), slices.bottom(), deviceScaleFactor);
rects[MiddlePiece] = snapRectToDevicePixels(inner.x(), inner.y(), inner.width(), inner.height(), deviceScaleFactor);
return rects;
}
FloatSize NinePieceImage::computeSideTileScale(ImagePiece piece, const Vector<FloatRect>& destinationRects, const Vector<FloatRect>& sourceRects)
{
ASSERT(!isCornerPiece(piece) && !isMiddlePiece(piece));
if (isEmptyPieceRect(piece, destinationRects, sourceRects))
return FloatSize(1, 1);
float scale;
if (isHorizontalPiece(piece))
scale = destinationRects[piece].height() / sourceRects[piece].height();
else
scale = destinationRects[piece].width() / sourceRects[piece].width();
return FloatSize(scale, scale);
}
FloatSize NinePieceImage::computeMiddleTileScale(const Vector<FloatSize>& scales, const Vector<FloatRect>& destinationRects, const Vector<FloatRect>& sourceRects, ENinePieceImageRule hRule, ENinePieceImageRule vRule)
{
FloatSize scale(1, 1);
if (isEmptyPieceRect(MiddlePiece, destinationRects, sourceRects))
return scale;
// Unlike the side pieces, the middle piece can have "stretch" specified in one axis but not the other.
// In fact the side pieces don't even use the scale factor unless they have a rule other than "stretch".
if (hRule == StretchImageRule)
scale.setWidth(destinationRects[MiddlePiece].width() / sourceRects[MiddlePiece].width());
else if (!isEmptyPieceRect(TopPiece, destinationRects, sourceRects))
scale.setWidth(scales[TopPiece].width());
else if (!isEmptyPieceRect(BottomPiece, destinationRects, sourceRects))
scale.setWidth(scales[BottomPiece].width());
if (vRule == StretchImageRule)
scale.setHeight(destinationRects[MiddlePiece].height() / sourceRects[MiddlePiece].height());
else if (!isEmptyPieceRect(LeftPiece, destinationRects, sourceRects))
scale.setHeight(scales[LeftPiece].height());
else if (!isEmptyPieceRect(RightPiece, destinationRects, sourceRects))
scale.setHeight(scales[RightPiece].height());
return scale;
}
Vector<FloatSize> NinePieceImage::computeTileScales(const Vector<FloatRect>& destinationRects, const Vector<FloatRect>& sourceRects, ENinePieceImageRule hRule, ENinePieceImageRule vRule)
{
Vector<FloatSize> scales(MaxPiece, FloatSize(1, 1));
scales[TopPiece] = computeSideTileScale(TopPiece, destinationRects, sourceRects);
scales[RightPiece] = computeSideTileScale(RightPiece, destinationRects, sourceRects);
scales[BottomPiece] = computeSideTileScale(BottomPiece, destinationRects, sourceRects);
scales[LeftPiece] = computeSideTileScale(LeftPiece, destinationRects, sourceRects);
scales[MiddlePiece] = computeMiddleTileScale(scales, destinationRects, sourceRects, hRule, vRule);
return scales;
}
void NinePieceImage::paint(GraphicsContext& graphicsContext, RenderElement* renderer, const RenderStyle& style, const LayoutRect& destination, const LayoutSize& source, float deviceScaleFactor, CompositeOperator op) const
{
StyleImage* styleImage = image();
ASSERT(styleImage);
ASSERT(styleImage->isLoaded());
LayoutBoxExtent sourceSlices = computeSlices(source, imageSlices(), styleImage->imageScaleFactor());
LayoutBoxExtent destinationSlices = computeSlices(destination.size(), borderSlices(), style.borderWidth(), sourceSlices);
scaleSlicesIfNeeded(destination.size(), destinationSlices, deviceScaleFactor);
Vector<FloatRect> destinationRects = computeNineRects(destination, destinationSlices, deviceScaleFactor);
Vector<FloatRect> sourceRects = computeNineRects(FloatRect(FloatPoint(), source), sourceSlices, deviceScaleFactor);
Vector<FloatSize> tileScales = computeTileScales(destinationRects, sourceRects, horizontalRule(), verticalRule());
RefPtr<Image> image = styleImage->image(renderer, source);
if (!image)
return;
InterpolationQualityMaintainer interpolationMaintainer(graphicsContext, ImageQualityController::interpolationQualityFromStyle(style));
for (ImagePiece piece = MinPiece; piece < MaxPiece; ++piece) {
if ((piece == MiddlePiece && !fill()) || isEmptyPieceRect(piece, destinationRects, sourceRects))
continue;
if (isCornerPiece(piece)) {
graphicsContext.drawImage(*image, destinationRects[piece], sourceRects[piece], op);
continue;
}
Image::TileRule hRule = isHorizontalPiece(piece) ? static_cast<Image::TileRule>(horizontalRule()) : Image::StretchTile;
Image::TileRule vRule = isVerticalPiece(piece) ? static_cast<Image::TileRule>(verticalRule()) : Image::StretchTile;
graphicsContext.drawTiledImage(*image, destinationRects[piece], sourceRects[piece], tileScales[piece], hRule, vRule, op);
}
}
inline NinePieceImage::Data::Data()
: fill(false)
, horizontalRule(StretchImageRule)
, verticalRule(StretchImageRule)
{
}
inline NinePieceImage::Data::Data(RefPtr<StyleImage>&& image, LengthBox imageSlices, bool fill, LengthBox borderSlices, LengthBox outset, ENinePieceImageRule horizontalRule, ENinePieceImageRule verticalRule)
: fill(fill)
, horizontalRule(horizontalRule)
, verticalRule(verticalRule)
, image(WTFMove(image))
, imageSlices(imageSlices)
, borderSlices(borderSlices)
, outset(outset)
{
}
inline NinePieceImage::Data::Data(const Data& other)
: RefCounted<Data>()
, fill(other.fill)
, horizontalRule(other.horizontalRule)
, verticalRule(other.verticalRule)
, image(other.image)
, imageSlices(other.imageSlices)
, borderSlices(other.borderSlices)
, outset(other.outset)
{
}
inline Ref<NinePieceImage::Data> NinePieceImage::Data::create()
{
return adoptRef(*new Data);
}
inline Ref<NinePieceImage::Data> NinePieceImage::Data::create(RefPtr<StyleImage>&& image, LengthBox imageSlices, bool fill, LengthBox borderSlices, LengthBox outset, ENinePieceImageRule horizontalRule, ENinePieceImageRule verticalRule)
{
return adoptRef(*new Data(WTFMove(image), imageSlices, fill, borderSlices, outset, horizontalRule, verticalRule));
}
Ref<NinePieceImage::Data> NinePieceImage::Data::copy() const
{
return adoptRef(*new Data(*this));
}
bool NinePieceImage::Data::operator==(const Data& other) const
{
return arePointingToEqualData(image, other.image)
&& imageSlices == other.imageSlices
&& fill == other.fill
&& borderSlices == other.borderSlices
&& outset == other.outset
&& horizontalRule == other.horizontalRule
&& verticalRule == other.verticalRule;
}
TextStream& operator<<(TextStream& ts, const NinePieceImage& image)
{
ts << "style-image " << image.image() << " slices " << image.imageSlices();
return ts;
}
}