allow canvas to force conservative clips (for speed)

tests/AAClipTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAAClip.h"
 #include "SkCanvas.h"
 #include "SkMask.h"
@@ skipping 353 matching lines @@
     copyToMask(a, &ma);
     copyToMask(b, &mb);
     SkAutoMaskFreeImage aCleanUp(ma.fImage);
     SkAutoMaskFreeImage bCleanUp(mb.fImage);
 
     return ma == mb;
 }
 
 static void did_dx_affect(skiatest::Reporter* reporter, const SkScalar dx[],
                           size_t count, bool changed) {
+    const SkISize baseSize = SkISize::Make(10, 10);
     SkIRect ir = { 0, 0, 10, 10 };
 
     for (size_t i = 0; i < count; ++i) {
         SkRect r;
         r.set(ir);
 
         SkRasterClip rc0(ir);
         SkRasterClip rc1(ir);
         SkRasterClip rc2(ir);
 
-        rc0.op(r, SkRegion::kIntersect_Op, false);
+        rc0.op(r, baseSize, SkRegion::kIntersect_Op, false);
         r.offset(dx[i], 0);
-        rc1.op(r, SkRegion::kIntersect_Op, true);
+        rc1.op(r, baseSize, SkRegion::kIntersect_Op, true);
         r.offset(-2*dx[i], 0);
-        rc2.op(r, SkRegion::kIntersect_Op, true);
+        rc2.op(r, baseSize, SkRegion::kIntersect_Op, true);
 
         REPORTER_ASSERT(reporter, changed != (rc0 == rc1));
         REPORTER_ASSERT(reporter, changed != (rc0 == rc2));
     }
 }
 
 static void test_nearly_integral(skiatest::Reporter* reporter) {
     // All of these should generate equivalent rasterclips
 
     static const SkScalar gSafeX[] = {
@@ skipping 24 matching lines @@
 DEF_TEST(AAClip, reporter) {
     test_empty(reporter);
     test_path_bounds(reporter);
     test_irect(reporter);
     test_rgn(reporter);
     test_path_with_hole(reporter);
     test_regressions();
     test_nearly_integral(reporter);
     test_really_a_rect(reporter);
 }