1 /* 2 * Copyright 2015 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 "SkBitmap.h" 11 #include "SkCanvas.h" 12 #include "SkGradientShader.h" 13 #include "SkImageGenerator.h" 14 #include "SkPaint.h" 15 #include "SkPath.h" 16 #include "SkPathOps.h" 17 #include "SkPicture.h" 18 #include "SkPictureRecorder.h" 19 20 static void draw_vector_logo(SkCanvas* canvas, const SkRect& viewBox) { 21 constexpr char kSkiaStr[] = "SKIA"; 22 constexpr SkScalar kGradientPad = .1f; 23 constexpr SkScalar kVerticalSpacing = 0.25f; 24 constexpr SkScalar kAccentScale = 1.20f; 25 26 SkPaint paint; 27 paint.setAntiAlias(true); 28 paint.setSubpixelText(true); 29 paint.setFakeBoldText(true); 30 sk_tool_utils::set_portable_typeface(&paint); 31 32 SkPath path; 33 SkRect iBox, skiBox, skiaBox; 34 paint.getTextPath("SKI", 3, 0, 0, &path); 35 TightBounds(path, &skiBox); 36 paint.getTextPath("I", 1, 0, 0, &path); 37 TightBounds(path, &iBox); 38 iBox.offsetTo(skiBox.fRight - iBox.width(), iBox.fTop); 39 40 const size_t textLen = strlen(kSkiaStr); 41 paint.getTextPath(kSkiaStr, textLen, 0, 0, &path); 42 TightBounds(path, &skiaBox); 43 skiaBox.outset(0, 2 * iBox.width() * (kVerticalSpacing + 1)); 44 45 const SkScalar accentSize = iBox.width() * kAccentScale; 46 const SkScalar underlineY = iBox.bottom() + 47 (kVerticalSpacing + SkScalarSqrt(3) / 2) * accentSize; 48 SkMatrix m; 49 m.setRectToRect(skiaBox, viewBox, SkMatrix::kFill_ScaleToFit); 50 SkAutoCanvasRestore acr(canvas, true); 51 canvas->concat(m); 52 53 canvas->drawCircle(iBox.centerX(), 54 iBox.y() - (0.5f + kVerticalSpacing) * accentSize, 55 accentSize / 2, 56 paint); 57 58 path.reset(); 59 path.moveTo(iBox.centerX() - accentSize / 2, iBox.bottom() + kVerticalSpacing * accentSize); 60 path.rLineTo(accentSize, 0); 61 path.lineTo(iBox.centerX(), underlineY); 62 canvas->drawPath(path, paint); 63 64 SkRect underlineRect = SkRect::MakeLTRB(iBox.centerX() - iBox.width() * accentSize * 3, 65 underlineY, 66 iBox.centerX(), 67 underlineY + accentSize / 10); 68 const SkPoint pts1[] = { SkPoint::Make(underlineRect.x(), 0), 69 SkPoint::Make(iBox.centerX(), 0) }; 70 const SkScalar pos1[] = { 0, 0.75f }; 71 const SkColor colors1[] = { SK_ColorTRANSPARENT, SK_ColorBLACK }; 72 SkASSERT(SK_ARRAY_COUNT(pos1) == SK_ARRAY_COUNT(colors1)); 73 paint.setShader(SkGradientShader::MakeLinear(pts1, colors1, pos1, SK_ARRAY_COUNT(pos1), 74 SkShader::kClamp_TileMode)); 75 canvas->drawRect(underlineRect, paint); 76 77 const SkPoint pts2[] = { SkPoint::Make(iBox.x() - iBox.width() * kGradientPad, 0), 78 SkPoint::Make(iBox.right() + iBox.width() * kGradientPad, 0) }; 79 const SkScalar pos2[] = { 0, .01f, 1.0f/3, 1.0f/3, 2.0f/3, 2.0f/3, .99f, 1 }; 80 const SkColor colors2[] = { 81 SK_ColorBLACK, 82 0xffca5139, 83 0xffca5139, 84 0xff8dbd53, 85 0xff8dbd53, 86 0xff5460a5, 87 0xff5460a5, 88 SK_ColorBLACK 89 }; 90 SkASSERT(SK_ARRAY_COUNT(pos2) == SK_ARRAY_COUNT(colors2)); 91 paint.setShader(SkGradientShader::MakeLinear(pts2, colors2, pos2, SK_ARRAY_COUNT(pos2), 92 SkShader::kClamp_TileMode)); 93 canvas->drawText(kSkiaStr, textLen, 0, 0, paint); 94 } 95 96 // This GM exercises SkPictureImageGenerator features 97 // (in particular its matrix vs. bounds semantics). 98 class PictureGeneratorGM : public skiagm::GM { 99 protected: 100 SkString onShortName() override { 101 return SkString("pictureimagegenerator"); 102 } 103 104 SkISize onISize() override { 105 return SkISize::Make(1160, 860); 106 } 107 108 void onOnceBeforeDraw() override { 109 const SkRect rect = SkRect::MakeWH(kPictureWidth, kPictureHeight); 110 SkPictureRecorder recorder; 111 SkCanvas* canvas = recorder.beginRecording(rect); 112 draw_vector_logo(canvas, rect); 113 fPicture = recorder.finishRecordingAsPicture(); 114 } 115 116 void onDraw(SkCanvas* canvas) override { 117 const struct { 118 SkISize size; 119 SkScalar scaleX, scaleY; 120 SkScalar opacity; 121 } configs[] = { 122 { SkISize::Make(200, 100), 1, 1, 1 }, 123 { SkISize::Make(200, 200), 1, 1, 1 }, 124 { SkISize::Make(200, 200), 1, 2, 1 }, 125 { SkISize::Make(400, 200), 2, 2, 1 }, 126 127 { SkISize::Make(200, 100), 1, 1, 0.9f }, 128 { SkISize::Make(200, 200), 1, 1, 0.75f }, 129 { SkISize::Make(200, 200), 1, 2, 0.5f }, 130 { SkISize::Make(400, 200), 2, 2, 0.25f }, 131 132 { SkISize::Make(200, 200), 0.5f, 1, 1 }, 133 { SkISize::Make(200, 200), 1, 0.5f, 1 }, 134 { SkISize::Make(200, 200), 0.5f, 0.5f, 1 }, 135 { SkISize::Make(200, 200), 2, 2, 1 }, 136 137 { SkISize::Make(200, 100), -1, 1, 1 }, 138 { SkISize::Make(200, 100), 1, -1, 1 }, 139 { SkISize::Make(200, 100), -1, -1, 1 }, 140 { SkISize::Make(200, 100), -1, -1, 0.5f }, 141 }; 142 143 auto srgbColorSpace = SkColorSpace::MakeSRGB(); 144 const unsigned kDrawsPerRow = 4; 145 const SkScalar kDrawSize = 250; 146 147 for (size_t i = 0; i < SK_ARRAY_COUNT(configs); ++i) { 148 SkPaint p; 149 p.setAlpha(SkScalarRoundToInt(255 * configs[i].opacity)); 150 151 SkMatrix m = SkMatrix::MakeScale(configs[i].scaleX, configs[i].scaleY); 152 if (configs[i].scaleX < 0) { 153 m.postTranslate(SkIntToScalar(configs[i].size.width()), 0); 154 } 155 if (configs[i].scaleY < 0) { 156 m.postTranslate(0, SkIntToScalar(configs[i].size.height())); 157 } 158 std::unique_ptr<SkImageGenerator> gen = 159 SkImageGenerator::MakeFromPicture(configs[i].size, fPicture, &m, 160 p.getAlpha() != 255 ? &p : nullptr, 161 SkImage::BitDepth::kU8, srgbColorSpace); 162 163 SkImageInfo bmInfo = gen->getInfo().makeColorSpace(canvas->imageInfo().refColorSpace()); 164 165 SkBitmap bm; 166 bm.allocPixels(bmInfo); 167 SkAssertResult(gen->getPixels(bm.info(), bm.getPixels(), bm.rowBytes())); 168 169 const SkScalar x = kDrawSize * (i % kDrawsPerRow); 170 const SkScalar y = kDrawSize * (i / kDrawsPerRow); 171 172 p.setColor(0xfff0f0f0); 173 p.setAlpha(255); 174 canvas->drawRect(SkRect::MakeXYWH(x, y, 175 SkIntToScalar(bm.width()), 176 SkIntToScalar(bm.height())), p); 177 canvas->drawBitmap(bm, x, y); 178 } 179 } 180 181 private: 182 sk_sp<SkPicture> fPicture; 183 184 const SkScalar kPictureWidth = 200; 185 const SkScalar kPictureHeight = 100; 186 187 typedef skiagm::GM INHERITED; 188 }; 189 190 DEF_GM(return new PictureGeneratorGM;) 191
