GPU implementation of drawArc.

This adds analytic shaders for filled arcs and butt-cap stroked arcs where the center point is not used.

BUG=skia:5227
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2259323003

Review-Url: https://codereview.chromium.org/2259323003

1 files changed, 19 insertions, 0 deletions

diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 258355e497..a6c8a1fc74 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -554,6 +554,25 @@ void SkGpuDevice::drawOval(const SkDraw& draw, const SkRect& oval, const SkPaint
     fDrawContext->drawOval(fClip, grPaint, *draw.fMatrix, oval, GrStyle(paint));
 }
 
+void SkGpuDevice::drawArc(const SkDraw& draw, const SkRect& oval, SkScalar startAngle,
+                          SkScalar sweepAngle, bool useCenter, const SkPaint& paint) {
+    ASSERT_SINGLE_OWNER
+    GR_CREATE_TRACE_MARKER_CONTEXT("SkGpuDevice", "drawArc", fContext);
+    CHECK_SHOULD_DRAW(draw);
+
+    if (paint.getMaskFilter()) {
+        this->INHERITED::drawArc(draw, oval, startAngle, sweepAngle, useCenter, paint);
+        return;
+    }
+    GrPaint grPaint;
+    if (!SkPaintToGrPaint(this->context(), fDrawContext.get(), paint, *draw.fMatrix, &grPaint)) {
+        return;
+    }
+
+    fDrawContext->drawArc(fClip, grPaint, *draw.fMatrix, oval, startAngle, sweepAngle, useCenter,
+                          GrStyle(paint));
+}
+
 #include "SkMaskFilter.h"
 
 ///////////////////////////////////////////////////////////////////////////////