| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorPriv.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTileMode.h" |
| #include "include/core/SkTypes.h" |
| |
| constexpr SkBlendMode gModes[] = { |
| SkBlendMode::kClear, |
| SkBlendMode::kSrc, |
| SkBlendMode::kDst, |
| SkBlendMode::kSrcOver, |
| SkBlendMode::kDstOver, |
| SkBlendMode::kSrcIn, |
| SkBlendMode::kDstIn, |
| SkBlendMode::kSrcOut, |
| SkBlendMode::kDstOut, |
| SkBlendMode::kSrcATop, |
| SkBlendMode::kDstATop, |
| SkBlendMode::kXor, |
| }; |
| |
| const int gWidth = 64; |
| const int gHeight = 64; |
| const SkScalar W = SkIntToScalar(gWidth); |
| const SkScalar H = SkIntToScalar(gHeight); |
| |
| static SkScalar drawCell(SkCanvas* canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1) { |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| |
| SkRect r = SkRect::MakeWH(W, H); |
| r.inset(W/10, H/10); |
| |
| paint.setColor(SK_ColorBLUE); |
| paint.setAlpha(a0); |
| canvas->drawOval(r, paint); |
| |
| paint.setColor(SK_ColorRED); |
| paint.setAlpha(a1); |
| paint.setBlendMode(mode); |
| for (int angle = 0; angle < 24; ++angle) { |
| SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth; |
| SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight; |
| paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24); |
| canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint); |
| } |
| |
| return H; |
| } |
| |
| static sk_sp<SkShader> make_bg_shader() { |
| SkBitmap bm; |
| bm.allocN32Pixels(2, 2); |
| *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF; |
| *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCE, 0xCF, 0xCE); |
| |
| SkMatrix m; |
| m.setScale(SkIntToScalar(6), SkIntToScalar(6)); |
| return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions(), m); |
| } |
| |
| namespace skiagm { |
| |
| class HairModesGM : public GM { |
| SkPaint fBGPaint; |
| |
| protected: |
| SkString getName() const override { return SkString("hairmodes"); } |
| |
| SkISize getISize() override { return SkISize::Make(640, 480); } |
| |
| void onOnceBeforeDraw() override { |
| fBGPaint.setShader(make_bg_shader()); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| const SkRect bounds = SkRect::MakeWH(W, H); |
| constexpr SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 }; |
| |
| canvas->translate(SkIntToScalar(4), SkIntToScalar(4)); |
| |
| for (int alpha = 0; alpha < 4; ++alpha) { |
| canvas->save(); |
| canvas->save(); |
| for (size_t i = 0; i < std::size(gModes); ++i) { |
| if (6 == i) { |
| canvas->restore(); |
| canvas->translate(W * 5, 0); |
| canvas->save(); |
| } |
| |
| canvas->drawRect(bounds, fBGPaint); |
| canvas->saveLayer(&bounds, nullptr); |
| SkScalar dy = drawCell(canvas, gModes[i], |
| gAlphaValue[alpha & 1], |
| gAlphaValue[alpha & 2]); |
| canvas->restore(); |
| |
| canvas->translate(0, dy * 5 / 4); |
| } |
| canvas->restore(); |
| canvas->restore(); |
| canvas->translate(W * 5 / 4, 0); |
| } |
| } |
| |
| private: |
| using INHERITED = GM; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM( return new HairModesGM; ) |
| } // namespace skiagm |