1 /* 2 * Copyright 2023 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 "gm/gm.h" 9 #include "include/core/SkCanvas.h" 10 #include "include/core/SkImage.h" 11 #include "include/core/SkMatrix.h" 12 #include "include/core/SkPaint.h" 13 #include "include/core/SkRect.h" 14 #include "include/core/SkShader.h" 15 #include "include/core/SkTileMode.h" 16 #include "tools/DecodeUtils.h" 17 #include "tools/Resources.h" 18 19 DEF_SIMPLE_GM(coordclampshader, canvas, 1074, 795) { 20 auto image = ToolUtils::GetResourceAsImage("images/mandrill_256.png"); 21 if (!image) { 22 return; 23 } 24 // The mandrill_512 image has a bottom row of mostly black pixels. Remove it. 25 image = image->makeSubset(nullptr, SkIRect::MakeWH(image->width(), image->height() - 1)); 26 image = image->withDefaultMipmaps(); 27 28 auto imageShader = image->makeShader(SkFilterMode::kLinear); 29 30 SkPaint paint; 31 32 auto drawRect = SkRect::Make(image->dimensions()); 33 34 auto rotate = SkMatrix::RotateDeg(45.f, drawRect.center()); 35 36 auto clampRect = drawRect.makeInset(20, 40); 37 38 canvas->translate(10, 10); 39 40 auto shader = SkShaders::CoordClamp(imageShader, clampRect); 41 paint.setShader(std::move(shader)); 42 canvas->drawRect(drawRect, paint); 43 44 canvas->save(); 45 canvas->translate(image->width(), 0); 46 shader = SkShaders::CoordClamp(imageShader->makeWithLocalMatrix(rotate), clampRect); 47 paint.setShader(std::move(shader)); 48 canvas->drawRect(drawRect, paint); 49 canvas->restore(); 50 51 canvas->save(); 52 canvas->translate(0, image->height()); 53 shader = SkShaders::CoordClamp(imageShader, clampRect)->makeWithLocalMatrix(rotate); 54 paint.setShader(std::move(shader)); 55 canvas->drawRect(drawRect, paint); 56 canvas->restore(); 57 58 canvas->save(); 59 canvas->translate(image->width(), image->height()); 60 shader = SkShaders::CoordClamp(imageShader->makeWithLocalMatrix(rotate), clampRect) 61 ->makeWithLocalMatrix(rotate); 62 paint.setShader(std::move(shader)); 63 canvas->drawRect(drawRect, paint); 64 canvas->restore(); 65 66 canvas->translate(0, 2 * image->height() + 10); 67 68 static const SkSamplingOptions kSamplers[] = { 69 SkSamplingOptions{SkFilterMode::kNearest}, 70 SkSamplingOptions{SkFilterMode::kLinear}, 71 SkSamplingOptions{SkFilterMode::kLinear, SkMipmapMode::kLinear}, 72 SkSamplingOptions::Aniso(16) 73 }; 74 75 for (const auto& sampler : kSamplers) { 76 imageShader = image->makeShader(SkTileMode::kMirror, 77 SkTileMode::kMirror, 78 sampler, 79 SkMatrix::Scale(0.3f, 1.0)); 80 81 shader = SkShaders::CoordClamp(imageShader, clampRect); 82 paint.setShader(std::move(shader)); 83 canvas->drawRect(drawRect, paint); 84 85 canvas->translate(image->width() + 10, 0); 86 } 87 } 88
