1 /* 2 * Copyright 2011 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 "SkCanvas.h" 10 #include "SkGradientShader.h" 11 12 namespace skiagm { 13 14 static void makebm(SkBitmap* bm, int w, int h) { 15 bm->allocN32Pixels(w, h); 16 bm->eraseColor(SK_ColorTRANSPARENT); 17 18 SkCanvas canvas(*bm); 19 SkScalar s = SkIntToScalar(SkMin32(w, h)); 20 static const SkPoint kPts0[] = { { 0, 0 }, { s, s } }; 21 static const SkPoint kPts1[] = { { s/2, 0 }, { s/2, s } }; 22 static const SkScalar kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 }; 23 static const SkColor kColors0[] = {0x80F00080, 0xF0F08000, 0x800080F0 }; 24 static const SkColor kColors1[] = {0xF08000F0, 0x8080F000, 0xF000F080 }; 25 26 27 SkPaint paint; 28 29 paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos, 30 SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode))->unref(); 31 canvas.drawPaint(paint); 32 paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos, 33 SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref(); 34 canvas.drawPaint(paint); 35 } 36 37 /////////////////////////////////////////////////////////////////////////////// 38 39 struct LabeledMatrix { 40 SkMatrix fMatrix; 41 const char* fLabel; 42 }; 43 44 static const char kText[] = "B"; 45 static const int kTextLen = SK_ARRAY_COUNT(kText) - 1; 46 static const int kPointSize = 300; 47 48 class ShaderText3GM : public GM { 49 public: 50 ShaderText3GM() { 51 this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD)); 52 } 53 54 protected: 55 56 SkString onShortName() override { 57 return SkString("shadertext3"); 58 } 59 60 SkISize onISize() override{ return SkISize::Make(800, 1000); } 61 62 void onOnceBeforeDraw() override { 63 makebm(&fBmp, kPointSize / 4, kPointSize / 4); 64 } 65 66 void onDraw(SkCanvas* canvas) override { 67 68 SkPaint bmpPaint; 69 bmpPaint.setAntiAlias(true); 70 bmpPaint.setFilterQuality(kLow_SkFilterQuality); 71 bmpPaint.setAlpha(0x80); 72 canvas->drawBitmap(fBmp, 5.f, 5.f, &bmpPaint); 73 74 SkPaint outlinePaint; 75 outlinePaint.setAntiAlias(true); 76 sk_tool_utils::set_portable_typeface(&outlinePaint); 77 outlinePaint.setTextSize(SkIntToScalar(kPointSize)); 78 outlinePaint.setStyle(SkPaint::kStroke_Style); 79 outlinePaint.setStrokeWidth(0.f); 80 81 canvas->translate(15.f, 15.f); 82 83 // draw glyphs scaled up 84 canvas->scale(2.f, 2.f); 85 86 static const SkShader::TileMode kTileModes[] = { 87 SkShader::kRepeat_TileMode, 88 SkShader::kMirror_TileMode, 89 }; 90 91 // position the baseline of the first run 92 canvas->translate(0.f, 0.75f * kPointSize); 93 94 canvas->save(); 95 int i = 0; 96 for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) { 97 for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) { 98 SkMatrix localM; 99 localM.setTranslate(5.f, 5.f); 100 localM.postRotate(20); 101 localM.postScale(1.15f, .85f); 102 103 SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(fBmp, 104 kTileModes[tm0], 105 kTileModes[tm1], 106 &localM)); 107 108 SkPaint fillPaint; 109 fillPaint.setAntiAlias(true); 110 sk_tool_utils::set_portable_typeface(&fillPaint); 111 fillPaint.setTextSize(SkIntToScalar(kPointSize)); 112 fillPaint.setFilterQuality(kLow_SkFilterQuality); 113 fillPaint.setShader(shader); 114 115 canvas->drawText(kText, kTextLen, 0, 0, fillPaint); 116 canvas->drawText(kText, kTextLen, 0, 0, outlinePaint); 117 SkScalar w = fillPaint.measureText(kText, kTextLen); 118 canvas->translate(w + 10.f, 0.f); 119 ++i; 120 if (!(i % 2)) { 121 canvas->restore(); 122 canvas->translate(0, 0.75f * kPointSize); 123 canvas->save(); 124 } 125 } 126 } 127 canvas->restore(); 128 } 129 130 private: 131 SkBitmap fBmp; 132 typedef GM INHERITED; 133 }; 134 135 /////////////////////////////////////////////////////////////////////////////// 136 137 static GM* MyFactory(void*) { return new ShaderText3GM; } 138 static GMRegistry reg(MyFactory); 139 } 140