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| 1 /* |
| 2 * Copyright 2016 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 "SkGammaColorFilter.h" |
| 10 #include "SkImage.h" |
| 11 |
| 12 // Fill a width x height block with a horizontal ramp from 0 to 255 |
| 13 static void draw_grey_ramp(SkCanvas* canvas, int width, int height, int numSteps
) { |
| 14 int greyPerStep = SkScalarRoundToInt(255.0f / numSteps); |
| 15 int widthPerStep = SkScalarRoundToInt(width / SkIntToScalar(numSteps)); |
| 16 |
| 17 SkIRect rect = SkIRect::MakeWH(widthPerStep, height); |
| 18 |
| 19 SkPaint paint; |
| 20 int grey = 0; |
| 21 int x = 0; |
| 22 for (int i = 0; i < numSteps-1; ++i) { |
| 23 paint.setColor(SkColorSetARGB(255, grey, grey, grey)); |
| 24 |
| 25 rect.offsetTo(x, 0); |
| 26 canvas->drawRect(SkRect::Make(rect), paint); |
| 27 |
| 28 x += widthPerStep; |
| 29 grey += greyPerStep; |
| 30 } |
| 31 |
| 32 paint.setColor(SK_ColorWHITE); |
| 33 rect.setLTRB(x, 0, width, height); |
| 34 canvas->drawRect(SkRect::Make(rect), paint); |
| 35 } |
| 36 |
| 37 static sk_sp<SkImage> create_grey_ramp(int width, int height, int numSteps) { |
| 38 SkBitmap bm; |
| 39 bm.allocN32Pixels(width, height); |
| 40 SkCanvas canvas(bm); |
| 41 canvas.clear(0x0); |
| 42 |
| 43 draw_grey_ramp(&canvas, width, height, numSteps); |
| 44 |
| 45 return SkImage::MakeFromBitmap(bm); |
| 46 } |
| 47 |
| 48 namespace skiagm { |
| 49 |
| 50 class GammaColorFilterGM : public GM { |
| 51 public: |
| 52 GammaColorFilterGM() { |
| 53 this->setBGColor(SK_ColorBLACK); |
| 54 } |
| 55 |
| 56 protected: |
| 57 |
| 58 SkString onShortName() override { |
| 59 return SkString("gammacolorfilter"); |
| 60 } |
| 61 |
| 62 SkISize onISize() override { |
| 63 return SkISize::Make(4 * kCellWidth, kCellHeight); |
| 64 } |
| 65 |
| 66 void onDraw(SkCanvas* canvas) override { |
| 67 GrDrawContext* drawContext = canvas->internal_private_accessTopLayerDraw
Context(); |
| 68 if (!drawContext) { |
| 69 skiagm::GM::DrawGpuOnlyMessage(canvas); |
| 70 return; |
| 71 } |
| 72 |
| 73 sk_sp<SkImage> image(create_grey_ramp(kCellWidth, kCellHeight/2, kNumGre
ySteps)); |
| 74 |
| 75 // Leftmost is a non-gamma pair |
| 76 draw_grey_ramp(canvas, kCellWidth, kCellHeight/2, kNumGreySteps); |
| 77 canvas->drawImage(image, 0, kCellHeight/2); |
| 78 canvas->translate(SkIntToScalar(image->width()), 0); |
| 79 |
| 80 for (auto gamma : { 1.0f, 1.0f / 1.8f, 1.0f / 2.2f }) { |
| 81 SkPaint paint; |
| 82 paint.setColorFilter(SkGammaColorFilter::Make(gamma)); |
| 83 |
| 84 draw_grey_ramp(canvas, kCellWidth, kCellHeight/2, kNumGreySteps); |
| 85 canvas->drawImage(image, 0, kCellHeight/2, &paint); |
| 86 canvas->translate(SkIntToScalar(image->width()), 0); |
| 87 } |
| 88 } |
| 89 |
| 90 private: |
| 91 static const int kCellWidth = 64; |
| 92 static const int kCellHeight = 64; |
| 93 static const int kNumGreySteps = 16; |
| 94 |
| 95 typedef GM INHERITED; |
| 96 }; |
| 97 |
| 98 ////////////////////////////////////////////////////////////////////////////// |
| 99 |
| 100 DEF_GM(return new GammaColorFilterGM;) |
| 101 } |
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