1/*
2 * Copyright 2021 Google LLC.
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
10#include "include/core/SkCanvas.h"
11#include "include/core/SkPaint.h"
12#include "include/core/SkPath.h"
13#include "include/gpu/GrContextOptions.h"
14
15namespace skiagm {
16
17class BatchedConvexPathsGM : public GM {
18private:
19    SkString onShortName() override { return SkString("batchedconvexpaths"); }
20    SkISize onISize() override { return SkISize::Make(512, 512); }
21
22    void modifyGrContextOptions(GrContextOptions* ctxOptions) override {
23        // Ensure our paths don't go through the atlas path renderer.
24        ctxOptions->fGpuPathRenderers &= ~GpuPathRenderers::kAtlas;
25    }
26
27    DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
28        canvas->clear(SK_ColorBLACK);
29        for (uint32_t i = 0; i < 10; ++i) {
30            SkAutoCanvasRestore acr(canvas, true);
31
32            int numPoints = (i + 3) * 3;
33            SkPath path;
34            path.moveTo(1, 0);
35            for (float j = 1; j < numPoints; j += 3) {
36                constexpr float k2PI = SK_ScalarPI * 2;
37                path.cubicTo(cosf(j/numPoints * k2PI), sinf(j/numPoints * k2PI),
38                             cosf((j+1)/numPoints * k2PI), sinf((j+1)/numPoints * k2PI),
39                             j+2 == numPoints ? 1 : cosf((j+2)/numPoints * k2PI),
40                             j+2 == numPoints ? 0 : sinf((j+2)/numPoints * k2PI));
41            }
42            float scale = 256 - i*24;
43            canvas->translate(scale + (256 - scale) * .33f, scale + (256 - scale) * .33f);
44            canvas->scale(scale, scale);
45
46            SkPaint paint;
47            paint.setColor(((i + 123458383u) * 285018463u) | 0xff808080);
48            paint.setAlphaf(0.3f);
49            paint.setAntiAlias(true);
50
51            canvas->drawPath(path, paint);
52        }
53        return DrawResult::kOk;
54    }
55};
56
57DEF_GM( return new BatchedConvexPathsGM; )
58
59}  // namespace skiagm
60