commit-bot@chromium.org | 6c1ee2d | 2013-10-07 18:00:17 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 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 | #include "SkLumaColorFilter.h" |
| 12 | |
| 13 | static SkScalar kSize = 80; |
| 14 | static SkScalar kInset = 10; |
| 15 | static SkColor kColor1 = SkColorSetARGB(0xff, 0xff, 0xff, 0); |
| 16 | static SkColor kColor2 = SkColorSetARGB(0xff, 0x80, 0xff, 0); |
| 17 | |
| 18 | static void draw_label(SkCanvas* canvas, const char* label, |
| 19 | const SkPoint& offset) { |
| 20 | SkPaint paint; |
| 21 | size_t len = strlen(label); |
| 22 | |
| 23 | SkScalar width = paint.measureText(label, len); |
| 24 | canvas->drawText(label, len, offset.x() - width / 2, offset.y(), |
| 25 | paint); |
| 26 | } |
| 27 | |
| 28 | static void draw_scene(SkCanvas* canvas, SkColorFilter* filter, |
| 29 | SkXfermode::Mode mode, SkShader* s1, |
| 30 | SkShader* s2) { |
| 31 | SkPaint paint; |
| 32 | paint.setAntiAlias(true); |
| 33 | SkRect r, c, bounds = SkRect::MakeWH(kSize, kSize); |
| 34 | |
| 35 | c = bounds; |
| 36 | c.fRight = bounds.centerX(); |
commit-bot@chromium.org | d494b09 | 2013-10-10 20:13:51 +0000 | [diff] [blame] | 37 | paint.setARGB(0x20, 0, 0, 0xff); |
commit-bot@chromium.org | 6c1ee2d | 2013-10-07 18:00:17 +0000 | [diff] [blame] | 38 | canvas->drawRect(bounds, paint); |
| 39 | |
| 40 | canvas->saveLayer(&bounds, NULL); |
| 41 | |
| 42 | r = bounds; |
| 43 | r.inset(kInset, 0); |
| 44 | paint.setShader(s1); |
| 45 | paint.setColor(s1 ? SK_ColorBLACK : SkColorSetA(kColor1, 0x80)); |
| 46 | canvas->drawOval(r, paint); |
| 47 | if (!s1) { |
| 48 | canvas->save(); |
| 49 | canvas->clipRect(c); |
| 50 | paint.setColor(kColor1); |
| 51 | canvas->drawOval(r, paint); |
| 52 | canvas->restore(); |
| 53 | } |
| 54 | |
| 55 | SkPaint xferPaint; |
| 56 | xferPaint.setXfermodeMode(mode); |
| 57 | canvas->saveLayer(&bounds, &xferPaint); |
| 58 | |
| 59 | r = bounds; |
| 60 | r.inset(0, kInset); |
| 61 | paint.setShader(s2); |
| 62 | paint.setColor(s2 ? SK_ColorBLACK : SkColorSetA(kColor2, 0x80)); |
| 63 | paint.setColorFilter(filter); |
| 64 | canvas->drawOval(r, paint); |
| 65 | if (!s2) { |
| 66 | canvas->save(); |
| 67 | canvas->clipRect(c); |
| 68 | paint.setColor(kColor2); |
| 69 | canvas->drawOval(r, paint); |
| 70 | canvas->restore(); |
| 71 | } |
| 72 | |
| 73 | canvas->restore(); |
| 74 | canvas->restore(); |
| 75 | } |
| 76 | |
| 77 | class LumaFilterGM : public skiagm::GM { |
| 78 | public: |
| 79 | LumaFilterGM() { |
| 80 | SkColor g1Colors[] = { kColor1, SkColorSetA(kColor1, 0x20) }; |
| 81 | SkColor g2Colors[] = { kColor2, SkColorSetA(kColor2, 0x20) }; |
| 82 | SkPoint g1Points[] = { { 0, 0 }, { 0, 100 } }; |
| 83 | SkPoint g2Points[] = { { 0, 0 }, { kSize, 0 } }; |
| 84 | SkScalar pos[] = { 0.2f, 1.0f }; |
| 85 | |
| 86 | fFilter.reset(SkLumaColorFilter::Create()); |
| 87 | fGr1.reset(SkGradientShader::CreateLinear(g1Points, |
| 88 | g1Colors, |
| 89 | pos, |
| 90 | SK_ARRAY_COUNT(g1Colors), |
| 91 | SkShader::kClamp_TileMode)); |
| 92 | fGr2.reset(SkGradientShader::CreateLinear(g2Points, |
| 93 | g2Colors, |
| 94 | pos, |
| 95 | SK_ARRAY_COUNT(g2Colors), |
| 96 | SkShader::kClamp_TileMode)); |
| 97 | } |
| 98 | |
| 99 | protected: |
| 100 | virtual SkString onShortName() SK_OVERRIDE { |
| 101 | return SkString("lumafilter"); |
| 102 | } |
| 103 | |
| 104 | virtual SkISize onISize() SK_OVERRIDE { |
| 105 | return SkISize::Make(600, 420); |
| 106 | } |
| 107 | |
| 108 | virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| 109 | SkXfermode::Mode modes[] = { SkXfermode::kSrcOver_Mode, |
| 110 | SkXfermode::kDstOver_Mode, |
| 111 | SkXfermode::kSrcATop_Mode, |
| 112 | SkXfermode::kDstATop_Mode, |
| 113 | SkXfermode::kSrcIn_Mode, |
| 114 | SkXfermode::kDstIn_Mode, |
| 115 | }; |
| 116 | struct { |
| 117 | SkShader* fShader1; |
| 118 | SkShader* fShader2; |
| 119 | } shaders[] = { |
| 120 | { NULL, NULL }, |
| 121 | { NULL, fGr2 }, |
| 122 | { fGr1, NULL }, |
| 123 | { fGr1, fGr2 }, |
| 124 | }; |
| 125 | |
| 126 | SkScalar gridStep = kSize + 2 * kInset; |
| 127 | for (size_t i = 0; i < SK_ARRAY_COUNT(modes); ++i) { |
| 128 | draw_label(canvas, SkXfermode::ModeName(modes[i]), |
| 129 | SkPoint::Make(gridStep * (0.5f + i), 20)); |
| 130 | } |
| 131 | |
| 132 | for (size_t i = 0; i < SK_ARRAY_COUNT(shaders); ++i) { |
| 133 | canvas->save(); |
| 134 | canvas->translate(kInset, gridStep * i + 30); |
| 135 | for (size_t m = 0; m < SK_ARRAY_COUNT(modes); ++m) { |
| 136 | draw_scene(canvas, fFilter, modes[m], shaders[i].fShader1, |
| 137 | shaders[i].fShader2); |
| 138 | canvas->translate(gridStep, 0); |
| 139 | } |
| 140 | canvas->restore(); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | private: |
| 145 | SkAutoTUnref<SkColorFilter> fFilter; |
| 146 | SkAutoTUnref<SkShader> fGr1, fGr2; |
| 147 | |
| 148 | typedef skiagm::GM INHERITED; |
| 149 | }; |
| 150 | |
| 151 | ////////////////////////////////////////////////////////////////////////////// |
| 152 | |
| 153 | DEF_GM( return SkNEW(LumaFilterGM); ) |