Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/StrokeData.cpp

-// 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 "config.h"
-#include "core/platform/graphics/StrokeData.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
-
-namespace WebCore {
-
-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(new SkDashPathEffect(intervals.get(), count, dashOffset));
-}
-
-float StrokeData::setupPaint(SkPaint* paint, int length) const
-{
-    float width = m_thickness;
-
-    paint->setStyle(SkPaint::kStroke_Style);
-    paint->setStrokeWidth(SkFloatToScalar(width));
-    paint->setStrokeCap(m_lineCap);
-    paint->setStrokeJoin(m_lineJoin);
-    paint->setStrokeMiter(SkFloatToScalar(m_miterLimit));
-
-    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
-            break;
-        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(new SkDashPathEffect(intervals, 2, SkIntToScalar(phase)));
-            paint->setPathEffect(pathEffect.get());
-        }
-    }
-
-    return width;
-}
-
-} // namespace