1 /*
2 * Copyright 2014 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 "bench/Benchmark.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColorFilter.h"
12 #include "include/core/SkImageFilter.h"
13 #include "include/core/SkSurface.h"
14 #include "include/effects/SkGradientShader.h"
15 #include "include/effects/SkImageFilters.h"
16
17 // Chains several matrix color filters image filter or several
18 // table filter image filters and draws a bitmap.
19 // This bench shows an improvement in performance and memory
20 // when collapsing matrices or tables is implemented since all
21 // the passes are collapsed in one.
22
23 class BaseImageFilterCollapseBench : public Benchmark {
24 public:
BaseImageFilterCollapseBench()25 BaseImageFilterCollapseBench() {}
26
27 protected:
doPreDraw(sk_sp<SkColorFilter> colorFilters[],int nFilters)28 void doPreDraw(sk_sp<SkColorFilter> colorFilters[], int nFilters) {
29 SkASSERT(!fImageFilter);
30
31 // Create a chain of ImageFilters from colorFilters
32 for(int i = nFilters; i --> 0;) {
33 fImageFilter = SkImageFilters::ColorFilter(colorFilters[i], fImageFilter);
34 }
35 }
36
onDraw(int loops,SkCanvas * canvas)37 void onDraw(int loops, SkCanvas* canvas) override {
38 makeBitmap();
39
40 for(int i = 0; i < loops; i++) {
41 SkPaint paint;
42 paint.setImageFilter(fImageFilter);
43 canvas->drawImage(fImage, 0, 0, SkSamplingOptions(), &paint);
44 }
45 }
46
47 private:
48 sk_sp<SkImageFilter> fImageFilter;
49 sk_sp<SkImage> fImage;
50
makeBitmap()51 void makeBitmap() {
52 int W = 400;
53 int H = 400;
54 auto surf = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(W, H));
55
56 SkPaint paint;
57 SkPoint pts[] = { {0, 0}, {SkIntToScalar(W), SkIntToScalar(H)} };
58 SkColor colors[] = {
59 SK_ColorBLACK, SK_ColorGREEN, SK_ColorCYAN,
60 SK_ColorRED, 0, SK_ColorBLUE, SK_ColorWHITE
61 };
62 paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, std::size(colors),
63 SkTileMode::kClamp));
64 surf->getCanvas()->drawPaint(paint);
65 fImage = surf->makeImageSnapshot(); // shader->makeImage()
66 }
67 };
68
69 class TableCollapseBench: public BaseImageFilterCollapseBench {
70 protected:
onGetName()71 const char* onGetName() override {
72 return "image_filter_collapse_table";
73 }
74
onDelayedSetup()75 void onDelayedSetup() override {
76 for (int i = 0; i < 256; ++i) {
77 int n = i >> 5;
78 table1[i] = (n << 5) | (n << 2) | (n >> 1);
79
80 table2[i] = i * i / 255;
81
82 float fi = i / 255.0f;
83 table3[i] = static_cast<uint8_t>(sqrtf(fi) * 255);
84 }
85
86 sk_sp<SkColorFilter> colorFilters[] = {
87 SkColorFilters::Table(table1),
88 SkColorFilters::Table(table2),
89 SkColorFilters::Table(table3),
90 };
91
92 this->doPreDraw(colorFilters, std::size(colorFilters));
93 }
94
95 private:
96 uint8_t table1[256], table2[256], table3[256];
97 };
98
make_brightness(float amount)99 static sk_sp<SkColorFilter> make_brightness(float amount) {
100 SkScalar matrix[20] = { 1, 0, 0, 0, amount,
101 0, 1, 0, 0, amount,
102 0, 0, 1, 0, amount,
103 0, 0, 0, 1, 0 };
104 return SkColorFilters::Matrix(matrix);
105 }
106
make_grayscale()107 static sk_sp<SkColorFilter> make_grayscale() {
108 float matrix[20];
109 memset(matrix, 0, 20 * sizeof(float));
110 matrix[0] = matrix[5] = matrix[10] = 0.2126f;
111 matrix[1] = matrix[6] = matrix[11] = 0.7152f;
112 matrix[2] = matrix[7] = matrix[12] = 0.0722f;
113 matrix[18] = 1.0f;
114 return SkColorFilters::Matrix(matrix);
115 }
116
117 class MatrixCollapseBench: public BaseImageFilterCollapseBench {
118 protected:
onGetName()119 const char* onGetName() override {
120 return "image_filter_collapse_matrix";
121 }
122
onDelayedSetup()123 void onDelayedSetup() override {
124 sk_sp<SkColorFilter> colorFilters[] = {
125 make_brightness(0.1f),
126 make_grayscale(),
127 make_brightness(-0.1f),
128 };
129
130 this->doPreDraw(colorFilters, std::size(colorFilters));
131 }
132 };
133
134 DEF_BENCH(return new TableCollapseBench;)
135 DEF_BENCH(return new MatrixCollapseBench;)
136