Robert Phillips | aea785b | 2018-08-03 11:15:24 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018 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" |
Mike Reed | 331ccfd | 2018-10-25 12:36:06 -0400 | [diff] [blame] | 11 | #include "SkTextUtils.h" |
Robert Phillips | aea785b | 2018-08-03 11:15:24 -0400 | [diff] [blame] | 12 | |
| 13 | namespace skiagm { |
| 14 | |
| 15 | // This GM recreates the blend mode images from the Android documentation |
| 16 | class AndroidBlendModesGM : public GM { |
| 17 | public: |
| 18 | AndroidBlendModesGM() { |
| 19 | this->setBGColor(SK_ColorBLACK); |
| 20 | } |
| 21 | |
| 22 | protected: |
| 23 | SkString onShortName() override { |
| 24 | return SkString("androidblendmodes"); |
| 25 | } |
| 26 | |
| 27 | SkISize onISize() override { |
| 28 | return SkISize::Make(kNumCols * kBitmapSize, kNumRows * kBitmapSize); |
| 29 | } |
| 30 | |
| 31 | void onOnceBeforeDraw() override { |
| 32 | SkImageInfo ii = SkImageInfo::MakeN32Premul(kBitmapSize, kBitmapSize); |
| 33 | { |
| 34 | fCompositeSrc.allocPixels(ii); |
| 35 | SkCanvas tmp(fCompositeSrc); |
| 36 | tmp.clear(SK_ColorTRANSPARENT); |
| 37 | SkPaint p; |
| 38 | p.setAntiAlias(true); |
| 39 | p.setColor(sk_tool_utils::color_to_565(kBlue)); |
| 40 | tmp.drawRect(SkRect::MakeLTRB(16, 96, 160, 240), p); |
| 41 | } |
| 42 | |
| 43 | { |
| 44 | fCompositeDst.allocPixels(ii); |
| 45 | SkCanvas tmp(fCompositeDst); |
| 46 | tmp.clear(SK_ColorTRANSPARENT); |
| 47 | SkPaint p; |
| 48 | p.setAntiAlias(true); |
| 49 | p.setColor(sk_tool_utils::color_to_565(kRed)); |
| 50 | tmp.drawCircle(160, 95, 80, p); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | void drawTile(SkCanvas* canvas, int xOffset, int yOffset, SkBlendMode mode) { |
| 55 | canvas->translate(xOffset, yOffset); |
| 56 | |
| 57 | canvas->clipRect(SkRect::MakeXYWH(0, 0, 256, 256)); |
| 58 | |
| 59 | canvas->saveLayer(nullptr, nullptr); |
| 60 | |
| 61 | SkPaint p; |
| 62 | canvas->drawBitmap(fCompositeDst, 0, 0, &p); |
| 63 | p.setBlendMode(mode); |
| 64 | canvas->drawBitmap(fCompositeSrc, 0, 0, &p); |
| 65 | } |
| 66 | |
| 67 | void onDraw(SkCanvas* canvas) override { |
Mike Reed | dc5863c | 2018-12-23 23:19:14 -0500 | [diff] [blame] | 68 | SkFont font(sk_tool_utils::create_portable_typeface()); |
Robert Phillips | aea785b | 2018-08-03 11:15:24 -0400 | [diff] [blame] | 69 | |
| 70 | sk_tool_utils::draw_checkerboard(canvas, |
Mike Klein | d46dce3 | 2018-08-16 10:17:03 -0400 | [diff] [blame] | 71 | kWhite, |
| 72 | kGrey, |
Robert Phillips | aea785b | 2018-08-03 11:15:24 -0400 | [diff] [blame] | 73 | 32); |
| 74 | |
| 75 | int xOffset = 0, yOffset = 0; |
| 76 | |
| 77 | // Android doesn't expose all the blend modes |
| 78 | // Note that the Android documentation calls: |
| 79 | // Skia's kPlus, add |
| 80 | // Skia's kModulate, multiply |
| 81 | for (SkBlendMode mode : { SkBlendMode::kPlus /* add */, SkBlendMode::kClear, |
| 82 | SkBlendMode::kDarken, SkBlendMode::kDst, |
| 83 | SkBlendMode::kDstATop, SkBlendMode::kDstIn, |
| 84 | SkBlendMode::kDstOut, SkBlendMode::kDstOver, |
| 85 | SkBlendMode::kLighten, SkBlendMode::kModulate /* multiply */, |
| 86 | SkBlendMode::kOverlay, SkBlendMode::kScreen, |
| 87 | SkBlendMode::kSrc, SkBlendMode::kSrcATop, |
| 88 | SkBlendMode::kSrcIn, SkBlendMode::kSrcOut, |
| 89 | SkBlendMode::kSrcOver, SkBlendMode::kXor } ) { |
| 90 | |
| 91 | int saveCount = canvas->save(); |
| 92 | this->drawTile(canvas, xOffset, yOffset, mode); |
| 93 | canvas->restoreToCount(saveCount); |
| 94 | |
Mike Reed | 331ccfd | 2018-10-25 12:36:06 -0400 | [diff] [blame] | 95 | SkTextUtils::DrawString(canvas, SkBlendMode_Name(mode), |
Robert Phillips | aea785b | 2018-08-03 11:15:24 -0400 | [diff] [blame] | 96 | xOffset + kBitmapSize/2.0f, |
| 97 | yOffset + kBitmapSize, |
Mike Reed | dc5863c | 2018-12-23 23:19:14 -0500 | [diff] [blame] | 98 | font, SkPaint(), SkTextUtils::kCenter_Align); |
Robert Phillips | aea785b | 2018-08-03 11:15:24 -0400 | [diff] [blame] | 99 | |
| 100 | xOffset += 256; |
| 101 | if (xOffset >= 1024) { |
| 102 | xOffset = 0; |
| 103 | yOffset += 256; |
| 104 | } |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | private: |
| 109 | static const int kBitmapSize = 256; |
| 110 | static const int kNumRows = 5; |
| 111 | static const int kNumCols = 4; |
| 112 | |
| 113 | static const SkColor kBlue = SkColorSetARGB(255, 22, 150, 243); |
| 114 | static const SkColor kRed = SkColorSetARGB(255, 233, 30, 99); |
| 115 | static const SkColor kWhite = SkColorSetARGB(255, 243, 243, 243); |
| 116 | static const SkColor kGrey = SkColorSetARGB(255, 222, 222, 222); |
| 117 | |
| 118 | SkBitmap fCompositeSrc; |
| 119 | SkBitmap fCompositeDst; |
| 120 | |
| 121 | typedef GM INHERITED; |
| 122 | }; |
| 123 | |
| 124 | ////////////////////////////////////////////////////////////////////////////// |
| 125 | |
| 126 | DEF_GM(return new AndroidBlendModesGM;) |
| 127 | } |