Florin Malita | 346ce63 | 2019-02-16 22:12:59 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019 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 | |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 8 | #include "gm/gm.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 9 | #include "include/core/SkCanvas.h" |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 10 | #include "include/core/SkColor.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 11 | #include "include/core/SkColorFilter.h" |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 12 | #include "include/core/SkImage.h" |
| 13 | #include "include/core/SkMatrix.h" |
| 14 | #include "include/core/SkPaint.h" |
| 15 | #include "include/core/SkPoint.h" |
| 16 | #include "include/core/SkRect.h" |
| 17 | #include "include/core/SkRefCnt.h" |
| 18 | #include "include/core/SkScalar.h" |
| 19 | #include "include/core/SkShader.h" |
| 20 | #include "include/core/SkSize.h" |
| 21 | #include "include/core/SkString.h" |
| 22 | #include "include/core/SkTileMode.h" |
| 23 | #include "include/core/SkTypes.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 24 | #include "include/effects/SkGradientShader.h" |
| 25 | #include "include/effects/SkLumaColorFilter.h" |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 26 | #include "tools/Resources.h" |
Florin Malita | 346ce63 | 2019-02-16 22:12:59 -0500 | [diff] [blame] | 27 | |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 28 | #include <math.h> |
| 29 | |
Mike Reed | 05be23d | 2019-03-28 09:22:28 -0600 | [diff] [blame] | 30 | // A tint filter maps colors to a given range (gradient), based on the input luminance: |
| 31 | // |
| 32 | // c' = lerp(lo, hi, luma(c)) |
| 33 | // |
| 34 | // TODO: move to public headers/API? |
| 35 | // |
| 36 | static sk_sp<SkColorFilter> MakeTintColorFilter(SkColor lo, SkColor hi) { |
| 37 | const auto r_lo = SkColorGetR(lo), |
| 38 | g_lo = SkColorGetG(lo), |
| 39 | b_lo = SkColorGetB(lo), |
| 40 | a_lo = SkColorGetA(lo), |
| 41 | r_hi = SkColorGetR(hi), |
| 42 | g_hi = SkColorGetG(hi), |
| 43 | b_hi = SkColorGetB(hi), |
| 44 | a_hi = SkColorGetA(hi); |
| 45 | |
| 46 | // We map component-wise: |
| 47 | // |
| 48 | // r' = lo.r + (hi.r - lo.r) * luma |
| 49 | // g' = lo.g + (hi.g - lo.g) * luma |
| 50 | // b' = lo.b + (hi.b - lo.b) * luma |
| 51 | // a' = lo.a + (hi.a - lo.a) * luma |
| 52 | // |
| 53 | // The input luminance is stored in the alpha channel |
| 54 | // (and RGB are cleared -- see SkLumaColorFilter). Thus: |
Mike Reed | e869a1e | 2019-04-30 12:18:54 -0400 | [diff] [blame] | 55 | const float tint_matrix[] = { |
| 56 | 0, 0, 0, (r_hi - r_lo) / 255.0f, SkIntToScalar(r_lo) / 255.0f, |
| 57 | 0, 0, 0, (g_hi - g_lo) / 255.0f, SkIntToScalar(g_lo) / 255.0f, |
| 58 | 0, 0, 0, (b_hi - b_lo) / 255.0f, SkIntToScalar(b_lo) / 255.0f, |
| 59 | 0, 0, 0, (a_hi - a_lo) / 255.0f, SkIntToScalar(a_lo) / 255.0f, |
Mike Reed | 05be23d | 2019-03-28 09:22:28 -0600 | [diff] [blame] | 60 | }; |
| 61 | |
Mike Reed | e869a1e | 2019-04-30 12:18:54 -0400 | [diff] [blame] | 62 | return SkColorFilters::Matrix(tint_matrix) |
Mike Reed | 05be23d | 2019-03-28 09:22:28 -0600 | [diff] [blame] | 63 | ->makeComposed(SkLumaColorFilter::Make()); |
| 64 | } |
| 65 | |
Florin Malita | 346ce63 | 2019-02-16 22:12:59 -0500 | [diff] [blame] | 66 | namespace { |
| 67 | |
| 68 | class MixerCFGM final : public skiagm::GM { |
| 69 | public: |
| 70 | MixerCFGM(const SkSize& tileSize, size_t tileCount) |
| 71 | : fTileSize(tileSize) |
| 72 | , fTileCount(tileCount) {} |
| 73 | |
| 74 | protected: |
| 75 | SkString onShortName() override { |
| 76 | return SkString("mixerCF"); |
| 77 | } |
| 78 | |
| 79 | SkISize onISize() override { |
| 80 | return SkISize::Make(fTileSize.width() * 1.2f * fTileCount, |
| 81 | fTileSize.height() * 1.2f * 3); // 3 rows |
| 82 | } |
| 83 | |
| 84 | void onDraw(SkCanvas* canvas) override { |
| 85 | SkPaint paint; |
| 86 | |
| 87 | const SkColor gradient_colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED }; |
| 88 | paint.setShader(SkGradientShader::MakeSweep(fTileSize.width() / 2, |
| 89 | fTileSize.height() / 2, |
| 90 | gradient_colors, nullptr, |
| 91 | SK_ARRAY_COUNT(gradient_colors))); |
| 92 | |
| 93 | auto cf0 = MakeTintColorFilter(0xff300000, 0xffa00000); // red tint |
| 94 | auto cf1 = MakeTintColorFilter(0xff003000, 0xff00a000); // green tint |
| 95 | |
| 96 | this->mixRow(canvas, paint, nullptr, cf1); |
| 97 | this->mixRow(canvas, paint, cf0, nullptr); |
| 98 | this->mixRow(canvas, paint, cf0, cf1); |
| 99 | } |
| 100 | |
| 101 | private: |
| 102 | const SkSize fTileSize; |
| 103 | const size_t fTileCount; |
| 104 | |
| 105 | void mixRow(SkCanvas* canvas, SkPaint& paint, |
| 106 | sk_sp<SkColorFilter> cf0, sk_sp<SkColorFilter> cf1) { |
| 107 | canvas->translate(0, fTileSize.height() * 0.1f); |
| 108 | { |
| 109 | SkAutoCanvasRestore arc(canvas, true); |
| 110 | for (size_t i = 0; i < fTileCount; ++i) { |
| 111 | paint.setColorFilter( |
Mike Reed | b286bc2 | 2019-04-08 16:23:20 -0400 | [diff] [blame] | 112 | SkColorFilters::Lerp(static_cast<float>(i) / (fTileCount - 1), cf0, cf1)); |
Florin Malita | 346ce63 | 2019-02-16 22:12:59 -0500 | [diff] [blame] | 113 | canvas->translate(fTileSize.width() * 0.1f, 0); |
| 114 | canvas->drawRect(SkRect::MakeWH(fTileSize.width(), fTileSize.height()), paint); |
| 115 | canvas->translate(fTileSize.width() * 1.1f, 0); |
| 116 | } |
| 117 | } |
| 118 | canvas->translate(0, fTileSize.height() * 1.1f); |
| 119 | } |
| 120 | |
Florin Malita | 346ce63 | 2019-02-16 22:12:59 -0500 | [diff] [blame] | 121 | using INHERITED = skiagm::GM; |
| 122 | }; |
| 123 | |
| 124 | } // namespace |
Florin Malita | 346ce63 | 2019-02-16 22:12:59 -0500 | [diff] [blame] | 125 | DEF_GM( return new MixerCFGM(SkSize::Make(200, 250), 5); ) |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 126 | |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 127 | static sk_sp<SkShader> make_resource_shader(const char path[], int size) { |
| 128 | auto img = GetResourceAsImage(path); |
| 129 | if (!img) { |
| 130 | return nullptr; |
| 131 | } |
| 132 | SkRect src = SkRect::MakeIWH(img->width(), img->height()); |
| 133 | SkRect dst = SkRect::MakeIWH(size, size); |
| 134 | SkMatrix m; |
| 135 | m.setRectToRect(src, dst, SkMatrix::kFill_ScaleToFit); |
| 136 | return img->makeShader(&m); |
| 137 | } |
| 138 | |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 139 | static sk_sp<SkShader> make_grad(int size, float t) { |
| 140 | SkASSERT(t >= 0 && t <= 1); |
| 141 | unsigned r = SkScalarRoundToInt(t * 255); |
| 142 | SkColor c = SkColorSetARGB(r, r, 0, 0); |
| 143 | |
| 144 | SkColor colors[] = { 0, c, SK_ColorRED }; |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 145 | SkPoint pts[] = {{0, 0}, {size*1.0f, size*1.0f}}; |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 146 | SkScalar pos[] = {0, 1 - t, 1.0f}; |
| 147 | return SkGradientShader::MakeLinear(pts, colors, pos, SK_ARRAY_COUNT(colors), |
Mike Reed | fae8fce | 2019-04-03 10:27:45 -0400 | [diff] [blame] | 148 | SkTileMode::kClamp); |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 149 | } |
| 150 | |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 151 | class ShaderMixerGM final : public skiagm::GM { |
| 152 | enum { SIZE = 256 }; |
| 153 | float fPos = 0.5f; |
| 154 | sk_sp<SkShader> fS0, fS1; |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 155 | |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 156 | public: |
| 157 | ShaderMixerGM() {} |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 158 | |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 159 | protected: |
| 160 | SkString onShortName() override { |
| 161 | return SkString("mixershader_shadermixer"); |
| 162 | } |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 163 | |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 164 | void onOnceBeforeDraw() override { |
| 165 | fS0 = make_resource_shader("images/mandrill_256.png", SIZE); |
| 166 | fS1 = make_resource_shader("images/baby_tux.png", SIZE); |
| 167 | } |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 168 | |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 169 | SkISize onISize() override { return {542, 542}; } |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 170 | |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 171 | void onDraw(SkCanvas* canvas) override { |
| 172 | SkRect r = SkRect::MakeIWH(SIZE, SIZE); |
Mike Reed | 79a7542 | 2019-03-15 15:45:09 -0400 | [diff] [blame] | 173 | |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 174 | SkPaint paint; |
| 175 | |
| 176 | canvas->translate(10, 10); |
| 177 | |
| 178 | canvas->save(); |
| 179 | paint.setShader(fS0); |
| 180 | canvas->drawRect(r, paint); |
| 181 | canvas->translate(SIZE + 10.0f, 0); |
| 182 | paint.setShader(fS1); |
| 183 | canvas->drawRect(r, paint); |
| 184 | canvas->restore(); |
| 185 | |
| 186 | auto sh2 = make_grad(SIZE, fPos); |
| 187 | |
| 188 | canvas->translate(0, SIZE + 10.0f); |
| 189 | paint.setShader(sh2); |
| 190 | canvas->drawRect(r, paint); |
| 191 | |
Mike Reed | c8bea7d | 2019-04-09 13:55:36 -0400 | [diff] [blame] | 192 | auto sh = SkShaders::Lerp(sh2, fS0, fS1); |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 193 | canvas->translate(SIZE + 10.0f, 0); |
| 194 | paint.setShader(sh); |
| 195 | canvas->drawRect(r, paint); |
| 196 | } |
| 197 | |
Hal Canary | 4124807 | 2019-07-11 16:32:53 -0400 | [diff] [blame] | 198 | bool onAnimate(double nanos) override { |
| 199 | fPos = (sin(1e-9 * nanos) + 1) * 0.5f; |
Mike Reed | e91825a | 2019-03-16 16:27:38 -0400 | [diff] [blame] | 200 | return true; |
| 201 | } |
| 202 | |
| 203 | private: |
| 204 | using INHERITED = skiagm::GM; |
| 205 | }; |
| 206 | DEF_GM( return new ShaderMixerGM; ) |