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// Copyright (C) 2013 Google Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// 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
// OWNER 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 "platform/graphics/StrokeData.h"
#include "third_party/skia/include/effects/SkDashPathEffect.h"
#include "wtf/PtrUtil.h"
#include <memory>
namespace blink {
static const int dashRatio = 3; // Ratio of the length of a dash to its width.
void StrokeData::setLineDash(const DashArray& dashes, float dashOffset) {
// FIXME: This is lifted directly off SkiaSupport, lines 49-74
// so it is not guaranteed to work correctly.
size_t dashLength = dashes.size();
if (!dashLength) {
// If no dash is set, revert to solid stroke
// FIXME: do we need to set NoStroke in some cases?
m_style = SolidStroke;
m_dash.reset();
return;
}
size_t count = !(dashLength % 2) ? dashLength : dashLength * 2;
std::unique_ptr<SkScalar[]> intervals = wrapArrayUnique(new SkScalar[count]);
for (unsigned i = 0; i < count; i++)
intervals[i] = dashes[i % dashLength];
m_dash = SkDashPathEffect::Make(intervals.get(), count, dashOffset);
}
void StrokeData::setupPaint(SkPaint* paint, int length) const {
paint->setStyle(SkPaint::kStroke_Style);
paint->setStrokeWidth(SkFloatToScalar(m_thickness));
paint->setStrokeCap(m_lineCap);
paint->setStrokeJoin(m_lineJoin);
paint->setStrokeMiter(SkFloatToScalar(m_miterLimit));
setupPaintDashPathEffect(paint, length);
}
void StrokeData::setupPaintDashPathEffect(SkPaint* paint, int length) const {
float width = m_thickness;
if (m_dash) {
paint->setPathEffect(m_dash);
} else {
switch (m_style) {
case NoStroke:
case SolidStroke:
case DoubleStroke:
case WavyStroke: // FIXME: https://crbug.com/229574
paint->setPathEffect(0);
return;
case DashedStroke:
width = dashRatio * width;
// Fall through.
case DottedStroke:
// Truncate the width, since we don't want fuzzy dots or dashes.
int dashLength = static_cast<int>(width);
// Subtract off the endcaps, since they're rendered separately.
int distance = length - 2 * static_cast<int>(m_thickness);
int phase = 1;
if (dashLength > 1) {
// Determine how many dashes or dots we should have.
int numDashes = distance / dashLength;
int remainder = distance % dashLength;
// Adjust the phase to center the dashes within the line.
if (numDashes % 2) {
// Odd: shift right a full dash, minus half the remainder.
phase = dashLength - remainder / 2;
} else {
// Even: shift right half a dash, minus half the remainder.
phase = (dashLength - remainder) / 2;
}
}
SkScalar dashLengthSk = SkIntToScalar(dashLength);
SkScalar intervals[2] = {dashLengthSk, dashLengthSk};
paint->setPathEffect(
SkDashPathEffect::Make(intervals, 2, SkIntToScalar(phase)));
}
}
}
} // namespace blink
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