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| 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 |
| 10 namespace skiagm { |
| 11 |
| 12 // This GM exercises HighQuality anisotropic filtering. |
| 13 class AnisotropicGM : public GM { |
| 14 public: |
| 15 AnisotropicGM() : fFilterQuality(kHigh_SkFilterQuality) { |
| 16 this->setBGColor(0xFFCCCCCC); |
| 17 } |
| 18 |
| 19 protected: |
| 20 |
| 21 SkString onShortName() override { return SkString("anisotropic_hq"); } |
| 22 |
| 23 SkISize onISize() override { |
| 24 return SkISize::Make(2*kImageSize + 3*kSpacer, |
| 25 kNumVertImages*kImageSize + (kNumVertImages+1)*kSpa
cer); |
| 26 } |
| 27 |
| 28 // Create an image consisting of lines radiating from its center |
| 29 void onOnceBeforeDraw() override { |
| 30 static const int kNumLines = 100; |
| 31 static const SkScalar kAngleStep = 360.0f / kNumLines; |
| 32 static const int kInnerOffset = 10; |
| 33 |
| 34 fBM.allocN32Pixels(kImageSize, kImageSize, true); |
| 35 |
| 36 SkCanvas canvas(fBM); |
| 37 |
| 38 canvas.clear(SK_ColorWHITE); |
| 39 |
| 40 SkPaint p; |
| 41 p.setAntiAlias(true); |
| 42 |
| 43 SkScalar angle = 0.0f, sin, cos; |
| 44 |
| 45 canvas.translate(kImageSize/2.0f, kImageSize/2.0f); |
| 46 for (int i = 0; i < kNumLines; ++i, angle += kAngleStep) { |
| 47 sin = SkScalarSinCos(angle, &cos); |
| 48 canvas.drawLine(cos * kInnerOffset, sin * kInnerOffset, |
| 49 cos * kImageSize/2, sin * kImageSize/2, p); |
| 50 } |
| 51 } |
| 52 |
| 53 void draw(SkCanvas* canvas, int x, int y, int xSize, int ySize) { |
| 54 SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y), |
| 55 SkIntToScalar(xSize), SkIntToScalar(ySize)); |
| 56 SkPaint p; |
| 57 p.setFilterQuality(fFilterQuality); |
| 58 canvas->drawBitmapRect(fBM, r, &p); |
| 59 } |
| 60 |
| 61 void onDraw(SkCanvas* canvas) override { |
| 62 SkScalar gScales[] = { 0.9f, 0.8f, 0.75f, 0.6f, 0.5f, 0.4f, 0.25f, 0.2f,
0.1f }; |
| 63 |
| 64 SkASSERT(kNumVertImages-1 == (int)SK_ARRAY_COUNT(gScales)/2); |
| 65 |
| 66 // Minimize vertically |
| 67 for (int i = 0; i < (int)SK_ARRAY_COUNT(gScales); ++i) { |
| 68 int height = SkScalarFloorToInt(fBM.height() * gScales[i]); |
| 69 |
| 70 int yOff; |
| 71 if (i <= (int)SK_ARRAY_COUNT(gScales)/2) { |
| 72 yOff = kSpacer + i * (fBM.height() + kSpacer); |
| 73 } else { |
| 74 // Position the more highly squashed images with their less squa
shed counterparts |
| 75 yOff = (SK_ARRAY_COUNT(gScales) - i) * (fBM.height() + kSpacer)
- height; |
| 76 } |
| 77 |
| 78 this->draw(canvas, kSpacer, yOff, fBM.width(), height); |
| 79 } |
| 80 |
| 81 // Minimize horizontally |
| 82 for (int i = 0; i < (int)SK_ARRAY_COUNT(gScales); ++i) { |
| 83 int width = SkScalarFloorToInt(fBM.width() * gScales[i]); |
| 84 |
| 85 int xOff, yOff; |
| 86 if (i <= (int)SK_ARRAY_COUNT(gScales)/2) { |
| 87 xOff = fBM.width() + 2*kSpacer; |
| 88 yOff = kSpacer + i * (fBM.height() + kSpacer); |
| 89 } else { |
| 90 // Position the more highly squashed images with their less squa
shed counterparts |
| 91 xOff = fBM.width() + 2*kSpacer + fBM.width() - width; |
| 92 yOff = kSpacer + (SK_ARRAY_COUNT(gScales) - i - 1) * (fBM.height
() + kSpacer); |
| 93 } |
| 94 |
| 95 this->draw(canvas, xOff, yOff, width, fBM.height()); |
| 96 } |
| 97 } |
| 98 |
| 99 private: |
| 100 static const int kImageSize = 256; |
| 101 static const int kSpacer = 10; |
| 102 static const int kNumVertImages = 5; |
| 103 |
| 104 SkBitmap fBM; |
| 105 SkFilterQuality fFilterQuality; |
| 106 |
| 107 typedef GM INHERITED; |
| 108 }; |
| 109 |
| 110 ////////////////////////////////////////////////////////////////////////////// |
| 111 |
| 112 DEF_GM( return SkNEW(AnisotropicGM); ) |
| 113 |
| 114 } |
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