cull edges that are to the right of the clip

src/core/SkEdgeClipper.cpp

 
 /*
  * Copyright 2009 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkEdgeClipper.h"
@@ skipping 130 matching lines @@
     SkASSERT(pts[0].fX <= pts[1].fX);
     SkASSERT(pts[1].fX <= pts[2].fX);
 
     // Now chop in X has needed, and record the segments
 
     if (pts[2].fX <= clip.fLeft) {  // wholly to the left
         this->appendVLine(clip.fLeft, pts[0].fY, pts[2].fY, reverse);
         return;
     }
     if (pts[0].fX >= clip.fRight) {  // wholly to the right
-        this->appendVLine(clip.fRight, pts[0].fY, pts[2].fY, reverse);
+        if (!this->canCullToTheRight()) {
+            this->appendVLine(clip.fRight, pts[0].fY, pts[2].fY, reverse);
+        }
         return;
     }
 
     SkScalar t;
     SkPoint tmp[5]; // for SkChopQuadAt
 
     // are we partially to the left
     if (pts[0].fX < clip.fLeft) {
         if (chopMonoQuadAtX(pts, clip.fLeft, &t)) {
             SkChopQuadAt(pts, tmp, t);
@@ skipping 181 matching lines @@
         reverse = !reverse;
     }
 
     // Now chop in X has needed, and record the segments
 
     if (pts[3].fX <= clip.fLeft) {  // wholly to the left
         this->appendVLine(clip.fLeft, pts[0].fY, pts[3].fY, reverse);
         return;
     }
     if (pts[0].fX >= clip.fRight) {  // wholly to the right
-        this->appendVLine(clip.fRight, pts[0].fY, pts[3].fY, reverse);
+        if (!this->canCullToTheRight()) {
+            this->appendVLine(clip.fRight, pts[0].fY, pts[3].fY, reverse);
+        }
         return;
     }
 
     // are we partially to the left
     if (pts[0].fX < clip.fLeft) {
         SkScalar t;
         if (chopMonoCubicAtX(pts, clip.fLeft, &t)) {
             SkPoint tmp[7];
             SkChopCubicAt(pts, tmp, t);
             this->appendVLine(clip.fLeft, tmp[0].fY, tmp[3].fY, reverse);
@@ skipping 158 matching lines @@
         assert_monotonic(&pts[0].fY, count);
     }
 }
 
 void sk_assert_monotonic_x(const SkPoint pts[], int count) {
     if (count > 1) {
         assert_monotonic(&pts[0].fX, count);
     }
 }
 #endif