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 "gm.h" 9 #include "sk_tool_utils.h" 10 #include "SkColor.h" 11 #include "SkGradientShader.h" 12 #include "SkMatrixConvolutionImageFilter.h" 13 14 namespace skiagm { 15 16 class MatrixConvolutionGM : public GM { 17 public: MatrixConvolutionGM(SkColor colorOne,SkColor colorTwo,const char * nameSuffix)18 MatrixConvolutionGM(SkColor colorOne, SkColor colorTwo, const char* nameSuffix) 19 : fNameSuffix(nameSuffix) { 20 this->setBGColor(0x00000000); 21 fColors[0] = colorOne; 22 fColors[1] = colorTwo; 23 } 24 25 protected: 26 onShortName()27 SkString onShortName() override { 28 return SkStringPrintf("matrixconvolution%s", fNameSuffix); 29 } 30 makeBitmap()31 void makeBitmap() { 32 // Draw our bitmap in N32, so legacy devices get "premul" values they understand 33 fBitmap.allocN32Pixels(80, 80); 34 SkCanvas canvas(fBitmap); 35 canvas.clear(0x00000000); 36 SkPaint paint; 37 paint.setColor(0xFFFFFFFF); 38 SkPoint pts[2] = { {0, 0}, 39 {0, 80.0f} }; 40 SkScalar pos[2] = { 0, 80.0f }; 41 paint.setShader(SkGradientShader::MakeLinear( 42 pts, fColors, pos, 2, SkShader::kClamp_TileMode)); 43 SkFont font(sk_tool_utils::create_portable_typeface(), 180.0f); 44 canvas.drawString("e", -10.0f, 80.0f, font, paint); 45 } 46 onISize()47 SkISize onISize() override { 48 return SkISize::Make(500, 300); 49 } 50 draw(SkCanvas * canvas,int x,int y,const SkIPoint & kernelOffset,SkMatrixConvolutionImageFilter::TileMode tileMode,bool convolveAlpha,const SkImageFilter::CropRect * cropRect=nullptr)51 void draw(SkCanvas* canvas, int x, int y, const SkIPoint& kernelOffset, 52 SkMatrixConvolutionImageFilter::TileMode tileMode, bool convolveAlpha, 53 const SkImageFilter::CropRect* cropRect = nullptr) { 54 SkScalar kernel[9] = { 55 SkIntToScalar( 1), SkIntToScalar( 1), SkIntToScalar( 1), 56 SkIntToScalar( 1), SkIntToScalar(-7), SkIntToScalar( 1), 57 SkIntToScalar( 1), SkIntToScalar( 1), SkIntToScalar( 1), 58 }; 59 SkISize kernelSize = SkISize::Make(3, 3); 60 SkScalar gain = 0.3f, bias = SkIntToScalar(100); 61 SkPaint paint; 62 paint.setImageFilter(SkMatrixConvolutionImageFilter::Make(kernelSize, 63 kernel, 64 gain, 65 bias, 66 kernelOffset, 67 tileMode, 68 convolveAlpha, 69 nullptr, 70 cropRect)); 71 canvas->save(); 72 canvas->translate(SkIntToScalar(x), SkIntToScalar(y)); 73 const SkRect layerBounds = SkRect::MakeIWH(fBitmap.width(), fBitmap.height()); 74 canvas->clipRect(layerBounds); 75 // This GM is, in part, intended to display the wrapping behavior of the 76 // matrix image filter. The only (rational) way to achieve that for repeat mode 77 // is to create a tight layer. 78 canvas->saveLayer(layerBounds, &paint); 79 canvas->drawBitmap(fBitmap, 0, 0, nullptr); 80 canvas->restore(); 81 canvas->restore(); 82 } 83 84 typedef SkMatrixConvolutionImageFilter MCIF; 85 onOnceBeforeDraw()86 void onOnceBeforeDraw() override { 87 this->makeBitmap(); 88 } 89 onDraw(SkCanvas * canvas)90 void onDraw(SkCanvas* canvas) override { 91 canvas->clear(SK_ColorBLACK); 92 SkIPoint kernelOffset = SkIPoint::Make(1, 0); 93 SkImageFilter::CropRect rect(SkRect::Make(fBitmap.bounds())); 94 for (int x = 10; x < 310; x += 100) { 95 this->draw(canvas, x, 10, kernelOffset, MCIF::kClamp_TileMode, true, &rect); 96 this->draw(canvas, x, 110, kernelOffset, MCIF::kClampToBlack_TileMode, true, &rect); 97 this->draw(canvas, x, 210, kernelOffset, MCIF::kRepeat_TileMode, true, &rect); 98 kernelOffset.fY++; 99 } 100 kernelOffset.fY = 1; 101 SkImageFilter::CropRect smallRect(SkRect::MakeXYWH(10, 5, 60, 60)); 102 this->draw(canvas, 310, 10, kernelOffset, MCIF::kClamp_TileMode, true, &smallRect); 103 this->draw(canvas, 310, 110, kernelOffset, MCIF::kClampToBlack_TileMode, true, &smallRect); 104 this->draw(canvas, 310, 210, kernelOffset, MCIF::kRepeat_TileMode, true, &smallRect); 105 106 this->draw(canvas, 410, 10, kernelOffset, MCIF::kClamp_TileMode, false, &rect); 107 this->draw(canvas, 410, 110, kernelOffset, MCIF::kClampToBlack_TileMode, false, &rect); 108 this->draw(canvas, 410, 210, kernelOffset, MCIF::kRepeat_TileMode, false, &rect); 109 } 110 111 private: 112 SkBitmap fBitmap; 113 SkColor fColors[2]; 114 const char* fNameSuffix; 115 116 typedef GM INHERITED; 117 }; 118 119 ////////////////////////////////////////////////////////////////////////////// 120 121 DEF_GM(return new MatrixConvolutionGM(0xFFFFFFFF, 0x40404040, "");) 122 DEF_GM(return new MatrixConvolutionGM(0xFFFF0000, 0xFF00FF00, "_color");) 123 124 } 125