xref: /aosp_15_r20/external/skia/tools/viewer/AnimBlurSlide.cpp (revision c8dee2aa9b3f27cf6c858bd81872bdeb2c07ed17)
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 "include/core/SkBlurTypes.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColorPriv.h"
11 #include "include/core/SkMaskFilter.h"
12 #include "src/base/SkRandom.h"
13 #include "tools/viewer/Slide.h"
14 
15 #include <iterator>
16 
get_anim_sin(double secs,SkScalar amplitude,SkScalar periodInSec,SkScalar phaseInSec)17 SkScalar get_anim_sin(double secs, SkScalar amplitude, SkScalar periodInSec, SkScalar phaseInSec) {
18     if (!periodInSec) {
19         return 0;
20     }
21     double t = secs + phaseInSec;
22     t *= (2 * SK_ScalarPI) / periodInSec;
23     amplitude = SK_ScalarHalf * amplitude;
24     return amplitude * SkDoubleToScalar(sin(t)) + amplitude;
25 }
26 
27 class AnimBlurSlide : public Slide {
28     SkScalar fBlurSigma = 0;
29     SkScalar fCircleRadius = 100;
30 
31 public:
AnimBlurSlide()32     AnimBlurSlide() { fName ="AnimBlur"; }
33 
draw(SkCanvas * canvas)34     void draw(SkCanvas* canvas) override {
35         static const SkBlurStyle gStyles[] = {
36             kNormal_SkBlurStyle,
37             kInner_SkBlurStyle,
38             kSolid_SkBlurStyle,
39             kOuter_SkBlurStyle,
40         };
41         SkRandom random;
42 
43         for (size_t i = 0; i < std::size(gStyles); ++i) {
44             SkPaint paint;
45             paint.setMaskFilter(SkMaskFilter::MakeBlur(gStyles[i],
46                                                        fBlurSigma));
47             paint.setColor(random.nextU() | 0xff000000);
48             canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
49                                200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
50                                fCircleRadius, paint);
51         }
52     }
53 
animate(double nanos)54     bool animate(double nanos) override {
55         fBlurSigma = get_anim_sin(1e-9 * nanos, 100, 4, 5);
56         fCircleRadius = 3 + get_anim_sin(1e-9 * nanos, 150, 25, 3);
57         return true;
58     }
59 };
60 
61 DEF_SLIDE( return new AnimBlurSlide(); )
62