1 /*
2 * Copyright 2021 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 "gm/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkPath.h"
11
12 constexpr int kSize = 1000;
13
14 // Makes sure PathInnerTriangulateOp uses correct stencil settings when there is a clip in the
15 // stencil buffer.
draw_clipped_flower(SkCanvas * canvas,SkPathFillType fillType)16 static void draw_clipped_flower(SkCanvas* canvas, SkPathFillType fillType) {
17 canvas->clear(SK_ColorCYAN);
18 SkPath clip;
19 clip.setFillType(SkPathFillType::kWinding);
20 constexpr static int kGridCount = 50;
21 constexpr static float kCellSize = (float)kSize / kGridCount;
22 for (int y = 0; y < kGridCount; ++y) {
23 clip.addRect(0, y * kCellSize, kSize, (y + 1) * kCellSize, SkPathDirection(y & 1));
24 }
25 for (int x = 0; x < kGridCount; ++x) {
26 clip.addRect(x * kCellSize, 0, (x + 1) * kCellSize, kSize, SkPathDirection(x & 1));
27 }
28 canvas->clipPath(clip);
29 SkPath flower;
30 flower.setFillType(fillType);
31 flower.moveTo(1, 0);
32 constexpr static int kNumPetals = 9;
33 for (int i = 1; i <= kNumPetals; ++i) {
34 float c = 2*SK_ScalarPI*(i - .5f) / kNumPetals;
35 float theta = 2*SK_ScalarPI*i / kNumPetals;
36 flower.quadTo(cosf(c)*2, sinf(c)*2, cosf(theta), sinf(theta));
37 }
38 flower.close();
39 flower.addArc(SkRect::MakeLTRB(-.75f, -.75f, .75f, .75f), 0, 360);
40 canvas->translate(kSize/2.f, kSize/2.f);
41 canvas->scale(kSize/3.f, kSize/3.f);
42 SkPaint p;
43 p.setAntiAlias(true);
44 p.setColor(SK_ColorMAGENTA);
45 canvas->drawPath(flower, p);
46 }
47
DEF_SIMPLE_GM(largeclippedpath_winding,canvas,kSize,kSize)48 DEF_SIMPLE_GM(largeclippedpath_winding, canvas, kSize, kSize) {
49 draw_clipped_flower(canvas, SkPathFillType::kWinding);
50 }
51
DEF_SIMPLE_GM(largeclippedpath_evenodd,canvas,kSize,kSize)52 DEF_SIMPLE_GM(largeclippedpath_evenodd, canvas, kSize, kSize) {
53 draw_clipped_flower(canvas, SkPathFillType::kEvenOdd);
54 }
55