src/third_party/skia/tests/StrokeTest.cpp

   1 /*
   2  * Copyright 2012 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "SkPaint.h"
   9 #include "SkPath.h"
  10 #include "SkRect.h"
  11 #include "SkStroke.h"
  12 #include "Test.h"
  13
  14 static bool equal(const SkRect& a, const SkRect& b) {
  15     return  SkScalarNearlyEqual(a.left(), b.left()) &&
  16             SkScalarNearlyEqual(a.top(), b.top()) &&
  17             SkScalarNearlyEqual(a.right(), b.right()) &&
  18             SkScalarNearlyEqual(a.bottom(), b.bottom());
  19 }
  20
  21 static void test_strokerect(skiatest::Reporter* reporter) {
  22     const SkScalar width = SkIntToScalar(10);
  23     SkPaint paint;
  24
  25     paint.setStyle(SkPaint::kStroke_Style);
  26     paint.setStrokeWidth(width);
  27
  28     SkRect r = { 0, 0, SkIntToScalar(200), SkIntToScalar(100) };
  29
  30     SkRect outer(r);
  31     outer.outset(width/2, width/2);
  32
  33     static const SkPaint::Join joins[] = {
  34         SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join
  35     };
  36
  37     for (size_t i = 0; i < SK_ARRAY_COUNT(joins); ++i) {
  38         paint.setStrokeJoin(joins[i]);
  39
  40         SkPath path, fillPath;
  41         path.addRect(r);
  42         paint.getFillPath(path, &fillPath);
  43
  44         REPORTER_ASSERT(reporter, equal(outer, fillPath.getBounds()));
  45
  46         bool isMiter = SkPaint::kMiter_Join == joins[i];
  47         SkRect nested[2];
  48         REPORTER_ASSERT(reporter, fillPath.isNestedRects(nested) == isMiter);
  49         if (isMiter) {
  50             SkRect inner(r);
  51             inner.inset(width/2, width/2);
  52             REPORTER_ASSERT(reporter, equal(nested[0], outer));
  53             REPORTER_ASSERT(reporter, equal(nested[1], inner));
  54         }
  55     }
  56 }
  57
  58 DEF_TEST(Stroke, reporter) {
  59     test_strokerect(reporter);
  60 }