Florin Malita | 325ea32 | 2018-04-04 14:17:30 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018 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 Reed | ac9f0c9 | 2020-12-23 10:11:33 -0500 | [diff] [blame] | 9 | #include "include/core/SkBitmap.h" |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 10 | #include "include/core/SkBlendMode.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 11 | #include "include/core/SkCanvas.h" |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 12 | #include "include/core/SkColor.h" |
| 13 | #include "include/core/SkImage.h" |
| 14 | #include "include/core/SkImageInfo.h" |
| 15 | #include "include/core/SkMatrix.h" |
| 16 | #include "include/core/SkPaint.h" |
| 17 | #include "include/core/SkRect.h" |
| 18 | #include "include/core/SkRefCnt.h" |
| 19 | #include "include/core/SkScalar.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 20 | #include "include/core/SkShader.h" |
| 21 | #include "include/core/SkSurface.h" |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 22 | #include "include/core/SkTypes.h" |
Michael Ludwig | 5c51f5f | 2020-06-02 12:55:10 -0400 | [diff] [blame] | 23 | #include "include/effects/SkGradientShader.h" |
| 24 | #include "tools/Resources.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 25 | #include "tools/ToolUtils.h" |
Florin Malita | 325ea32 | 2018-04-04 14:17:30 -0400 | [diff] [blame] | 26 | |
| 27 | static sk_sp<SkImage> make_image(SkCanvas* rootCanvas) { |
| 28 | static constexpr SkScalar kSize = 50; |
| 29 | SkImageInfo info = SkImageInfo::MakeN32Premul(kSize, kSize); |
Mike Klein | ea3f014 | 2019-03-20 11:12:10 -0500 | [diff] [blame] | 30 | auto surface = ToolUtils::makeSurface(rootCanvas, info); |
Florin Malita | 325ea32 | 2018-04-04 14:17:30 -0400 | [diff] [blame] | 31 | |
| 32 | SkPaint p; |
| 33 | p.setAntiAlias(true); |
| 34 | p.setColor(SK_ColorGREEN); |
| 35 | |
| 36 | surface->getCanvas()->drawCircle(kSize / 2, kSize / 2, kSize / 2, p); |
| 37 | |
| 38 | p.setStyle(SkPaint::kStroke_Style); |
| 39 | p.setColor(SK_ColorRED); |
| 40 | surface->getCanvas()->drawLine(kSize * .25f, kSize * .50f, kSize * .75f, kSize * .50f, p); |
| 41 | surface->getCanvas()->drawLine(kSize * .50f, kSize * .25f, kSize * .50f, kSize * .75f, p); |
| 42 | |
| 43 | return surface->makeImageSnapshot(); |
| 44 | } |
| 45 | |
| 46 | DEF_SIMPLE_GM(localmatrixshader_nested, canvas, 450, 1200) { |
| 47 | auto image = make_image(canvas); |
| 48 | |
| 49 | using FactoryT = sk_sp<SkShader> (*)(const sk_sp<SkImage>&, |
| 50 | const SkMatrix& inner, |
| 51 | const SkMatrix& outer); |
| 52 | static const FactoryT gFactories[] = { |
| 53 | // SkLocalMatrixShader(SkImageShader(inner), outer) |
| 54 | [](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) { |
Mike Reed | b612b6c | 2020-12-08 21:58:35 -0500 | [diff] [blame] | 55 | return img->makeShader(SkSamplingOptions(), inner)->makeWithLocalMatrix(outer); |
Florin Malita | 325ea32 | 2018-04-04 14:17:30 -0400 | [diff] [blame] | 56 | }, |
| 57 | |
| 58 | // SkLocalMatrixShader(SkLocalMatrixShader(SkImageShader(I), inner), outer) |
| 59 | [](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) { |
Mike Reed | b612b6c | 2020-12-08 21:58:35 -0500 | [diff] [blame] | 60 | return img->makeShader(SkSamplingOptions())->makeWithLocalMatrix(inner)->makeWithLocalMatrix(outer); |
Florin Malita | 325ea32 | 2018-04-04 14:17:30 -0400 | [diff] [blame] | 61 | }, |
| 62 | |
| 63 | // SkLocalMatrixShader(SkComposeShader(SkImageShader(inner)), outer) |
| 64 | [](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) { |
Mike Reed | c8bea7d | 2019-04-09 13:55:36 -0400 | [diff] [blame] | 65 | return SkShaders::Blend(SkBlendMode::kSrcOver, |
| 66 | SkShaders::Color(SK_ColorTRANSPARENT), |
Mike Reed | b612b6c | 2020-12-08 21:58:35 -0500 | [diff] [blame] | 67 | img->makeShader(SkSamplingOptions(), inner)) |
Florin Malita | 325ea32 | 2018-04-04 14:17:30 -0400 | [diff] [blame] | 68 | ->makeWithLocalMatrix(outer); |
| 69 | }, |
| 70 | |
| 71 | // SkLocalMatrixShader(SkComposeShader(SkLocalMatrixShader(SkImageShader(I), inner)), outer) |
| 72 | [](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) { |
Mike Reed | c8bea7d | 2019-04-09 13:55:36 -0400 | [diff] [blame] | 73 | return SkShaders::Blend(SkBlendMode::kSrcOver, |
| 74 | SkShaders::Color(SK_ColorTRANSPARENT), |
Mike Reed | b612b6c | 2020-12-08 21:58:35 -0500 | [diff] [blame] | 75 | img->makeShader(SkSamplingOptions())->makeWithLocalMatrix(inner)) |
Florin Malita | 325ea32 | 2018-04-04 14:17:30 -0400 | [diff] [blame] | 76 | ->makeWithLocalMatrix(outer); |
| 77 | }, |
| 78 | }; |
| 79 | |
Mike Reed | 1f60733 | 2020-05-21 12:11:27 -0400 | [diff] [blame] | 80 | static const auto inner = SkMatrix::Scale(2, 2), |
| 81 | outer = SkMatrix::Translate(20, 20); |
Florin Malita | 325ea32 | 2018-04-04 14:17:30 -0400 | [diff] [blame] | 82 | |
| 83 | SkPaint border; |
| 84 | border.setAntiAlias(true); |
| 85 | border.setStyle(SkPaint::kStroke_Style); |
| 86 | |
| 87 | auto rect = SkRect::Make(image->bounds()); |
| 88 | SkAssertResult(SkMatrix::Concat(inner, outer).mapRect(&rect)); |
| 89 | |
| 90 | const auto drawColumn = [&]() { |
| 91 | SkAutoCanvasRestore acr(canvas, true); |
| 92 | for (const auto& f : gFactories) { |
| 93 | SkPaint p; |
| 94 | p.setShader(f(image, inner, outer)); |
| 95 | |
| 96 | canvas->drawRect(rect, p); |
| 97 | canvas->drawRect(rect, border); |
| 98 | |
| 99 | canvas->translate(0, rect.height() * 1.5f); |
| 100 | } |
| 101 | }; |
| 102 | |
| 103 | drawColumn(); |
| 104 | |
| 105 | { |
| 106 | SkAutoCanvasRestore acr(canvas, true); |
| 107 | canvas->translate(0, rect.height() * SK_ARRAY_COUNT(gFactories) * 1.5f); |
| 108 | drawColumn(); |
| 109 | } |
| 110 | |
| 111 | canvas->translate(rect.width() * 1.5f, 0); |
| 112 | canvas->scale(2, 2); |
| 113 | drawColumn(); |
| 114 | } |
Michael Ludwig | 5c51f5f | 2020-06-02 12:55:10 -0400 | [diff] [blame] | 115 | |
| 116 | DEF_SIMPLE_GM(localmatrixshader_persp, canvas, 542, 266) { |
| 117 | auto image = GetResourceAsImage("images/yellow_rose.png"); |
| 118 | |
| 119 | SkBitmap downsized; |
| 120 | downsized.allocPixels(image->imageInfo().makeWH(128, 128)); |
Mike Reed | 5ec2238 | 2021-01-14 21:59:01 -0500 | [diff] [blame] | 121 | image->scalePixels(downsized.pixmap(), SkSamplingOptions(SkFilterMode::kLinear)); |
Mike Reed | ac9f0c9 | 2020-12-23 10:11:33 -0500 | [diff] [blame] | 122 | image = downsized.asImage(); |
Michael Ludwig | 5c51f5f | 2020-06-02 12:55:10 -0400 | [diff] [blame] | 123 | SkRect imgRect = SkRect::MakeIWH(image->width(), image->height()); |
| 124 | |
| 125 | // scale matrix |
| 126 | SkMatrix scale = SkMatrix::Scale(1.f / 5.f, 1.f / 5.f); |
| 127 | |
| 128 | // perspective matrix |
| 129 | SkPoint src[4]; |
| 130 | imgRect.toQuad(src); |
| 131 | SkPoint dst[4] = {{0, 10.f}, |
| 132 | {image->width() + 28.f, -100.f}, |
| 133 | {image->width() - 28.f, image->height() + 100.f}, |
| 134 | {0.f, image->height() - 10.f}}; |
| 135 | SkMatrix persp; |
| 136 | SkAssertResult(persp.setPolyToPoly(src, dst, 4)); |
| 137 | |
| 138 | // combined persp * scale |
| 139 | SkMatrix perspScale = SkMatrix::Concat(persp, scale); |
| 140 | |
| 141 | auto draw = [&](sk_sp<SkShader> shader, bool applyPerspToCTM) { |
| 142 | canvas->save(); |
| 143 | canvas->clipRect(imgRect); |
| 144 | if (applyPerspToCTM) { |
| 145 | canvas->concat(persp); |
| 146 | } |
| 147 | SkPaint imgShaderPaint; |
| 148 | imgShaderPaint.setShader(std::move(shader)); |
| 149 | canvas->drawPaint(imgShaderPaint); |
| 150 | canvas->restore(); |
| 151 | |
| 152 | canvas->translate(10.f + image->width(), 0.f); // advance |
| 153 | }; |
| 154 | |
| 155 | // SkImageShader |
| 156 | canvas->save(); |
| 157 | // 4 variants that all attempt to apply sample at persp * scale w/ an image shader |
| 158 | // 1. scale provided to SkImage::makeShader(...) but drawn with persp |
Mike Reed | b612b6c | 2020-12-08 21:58:35 -0500 | [diff] [blame] | 159 | auto s1 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, |
| 160 | SkSamplingOptions(), &scale); |
Michael Ludwig | 5c51f5f | 2020-06-02 12:55:10 -0400 | [diff] [blame] | 161 | draw(s1, true); |
| 162 | |
| 163 | // 2. persp provided to SkImage::makeShader, then wrapped in scale makeWithLocalMatrix |
| 164 | // These pre-concat, so it ends up as persp * scale. |
Mike Reed | b612b6c | 2020-12-08 21:58:35 -0500 | [diff] [blame] | 165 | auto s2 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, |
| 166 | SkSamplingOptions(), &persp) |
Michael Ludwig | 5c51f5f | 2020-06-02 12:55:10 -0400 | [diff] [blame] | 167 | ->makeWithLocalMatrix(scale); |
| 168 | draw(s2, false); |
| 169 | |
| 170 | // 3. Providing pre-computed persp*scale to SkImage::makeShader() |
Mike Reed | b612b6c | 2020-12-08 21:58:35 -0500 | [diff] [blame] | 171 | auto s3 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, |
| 172 | SkSamplingOptions(), &perspScale); |
Michael Ludwig | 5c51f5f | 2020-06-02 12:55:10 -0400 | [diff] [blame] | 173 | draw(s3, false); |
| 174 | |
| 175 | // 4. Providing pre-computed persp*scale to makeWithLocalMatrix |
Mike Reed | b612b6c | 2020-12-08 21:58:35 -0500 | [diff] [blame] | 176 | auto s4 = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions()) |
Michael Ludwig | 5c51f5f | 2020-06-02 12:55:10 -0400 | [diff] [blame] | 177 | ->makeWithLocalMatrix(perspScale); |
| 178 | draw(s4, false); |
| 179 | canvas->restore(); |
| 180 | |
| 181 | canvas->translate(0.f, 10.f + image->height()); // advance to next row |
| 182 | |
| 183 | // SkGradientShader |
| 184 | const SkColor kGradColors[] = { SK_ColorBLACK, SK_ColorTRANSPARENT }; |
| 185 | canvas->save(); |
| 186 | // 1. scale provided to Make, drawn with persp |
| 187 | auto g1 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()}, |
| 188 | imgRect.width() / 2.f, kGradColors, nullptr, 2, |
| 189 | SkTileMode::kRepeat, 0, &scale); |
| 190 | draw(g1, true); |
| 191 | |
| 192 | // 2. persp provided to Make, then wrapped with makeWithLocalMatrix (pre-concat as before). |
| 193 | auto g2 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()}, |
| 194 | imgRect.width() / 2.f, kGradColors, nullptr, 2, |
| 195 | SkTileMode::kRepeat, 0, &persp) |
| 196 | ->makeWithLocalMatrix(scale); |
| 197 | draw(g2, false); |
| 198 | |
| 199 | // 3. Provide per-computed persp*scale to Make |
| 200 | auto g3 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()}, |
| 201 | imgRect.width() / 2.f, kGradColors, nullptr, 2, |
| 202 | SkTileMode::kRepeat, 0, &perspScale); |
| 203 | draw(g3, false); |
| 204 | |
| 205 | // 4. Providing pre-computed persp*scale to makeWithLocalMatrix |
| 206 | auto g4 = SkGradientShader::MakeRadial({imgRect.centerX(), imgRect.centerY()}, |
| 207 | imgRect.width() / 2.f, kGradColors, nullptr, 2, |
| 208 | SkTileMode::kRepeat) |
| 209 | ->makeWithLocalMatrix(perspScale); |
| 210 | draw(g4, false); |
| 211 | canvas->restore(); |
| 212 | } |