Make update_edge as a member function of SkAnalyticEdge

This is to prepare for future SkScan_DAAPath.cpp to use this member function
(https://skia-review.googlesource.com/c/19666/).

Bug: skia:
Change-Id: I5fb90ac67b80f8a69a712e7e697d68dcadba5d14
Reviewed-on: https://skia-review.googlesource.com/24180
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/core/SkAnalyticEdge.cpp b/src/core/SkAnalyticEdge.cpp
index f6ad62f12f..7cb6493f8b 100644
--- a/src/core/SkAnalyticEdge.cpp
+++ b/src/core/SkAnalyticEdge.cpp
@@ -48,6 +48,16 @@ bool SkAnalyticEdge::updateLine(SkFixed x0, SkFixed y0, SkFixed x1, SkFixed y1,
     return true;
 }
 
+bool SkAnalyticEdge::update(SkFixed last_y) {
+    SkASSERT(last_y >= fLowerY); // we shouldn't update edge if last_y < fLowerY
+    if (fCurveCount < 0) {
+        return static_cast<SkAnalyticCubicEdge*>(this)->updateCubic();
+    } else if (fCurveCount > 0) {
+        return static_cast<SkAnalyticQuadraticEdge*>(this)->updateQuadratic();
+    }
+    return false;
+}
+
 bool SkAnalyticQuadraticEdge::setQuadratic(const SkPoint pts[3]) {
     fRiteE = nullptr;