| // 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 "sky/engine/platform/graphics/StrokeData.h" |
| #include "sky/engine/wtf/OwnPtr.h" |
| #include "sky/engine/wtf/PassOwnPtr.h" |
| |
| 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.clear(); |
| return; |
| } |
| |
| size_t count = !(dashLength % 2) ? dashLength : dashLength * 2; |
| OwnPtr<SkScalar[]> intervals = adoptArrayPtr(new SkScalar[count]); |
| |
| for (unsigned i = 0; i < count; i++) |
| intervals[i] = dashes[i % dashLength]; |
| |
| m_dash = adoptRef(SkDashPathEffect::Create(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.get()); |
| } else { |
| switch (m_style) { |
| case NoStroke: |
| case SolidStroke: |
| case DoubleStroke: |
| case WavyStroke: // FIXME: https://code.google.com/p/chromium/issues/detail?id=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 }; |
| RefPtr<SkDashPathEffect> pathEffect = adoptRef(SkDashPathEffect::Create(intervals, 2, SkIntToScalar(phase))); |
| paint->setPathEffect(pathEffect.get()); |
| } |
| } |
| } |
| |
| } // namespace blink |