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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 "SkCanvas.h" |
| 9 #include "SkColorFilter.h" |
| 10 #include "SkColorFilterImageFilter.h" |
| 11 #include "SkDrawLooper.h" |
| 12 #include "Test.h" |
| 13 |
| 14 /* Tests for SkDrawLooper -related APIs and implementations. */ |
| 15 |
| 16 namespace { |
| 17 /* |
| 18 * Subclass that caused an assert at the time of writing. |
| 19 */ |
| 20 class GetSaveCountAssertLooper : public SkDrawLooper { |
| 21 public: |
| 22 |
| 23 SkDrawLooper::Context* createContext(SkCanvas*, void* storage) const overrid
e { |
| 24 return SkNEW_PLACEMENT(storage, GetSaveCountAssertLooperContext); |
| 25 } |
| 26 |
| 27 size_t contextSize() const override { return sizeof(GetSaveCountAssertLooper
Context); } |
| 28 |
| 29 #ifndef SK_IGNORE_TO_STRING |
| 30 void toString(SkString* str) const override { |
| 31 str->append("GetSaveCountAssertLooper:"); |
| 32 } |
| 33 #endif |
| 34 |
| 35 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(GetSaveCountAssertLooper
); |
| 36 |
| 37 private: |
| 38 class GetSaveCountAssertLooperContext : public SkDrawLooper::Context { |
| 39 public: |
| 40 GetSaveCountAssertLooperContext() : fOnce(0) {} |
| 41 bool next(SkCanvas* canvas, SkPaint* p) override { |
| 42 // Getting the save count would assert in SkCanvas at the time of wr
iting. |
| 43 canvas->getSaveCount(); |
| 44 |
| 45 SkASSERT(p->getColor() == SK_ColorRED); |
| 46 // Set the color green so the test knows payload was run. We use thi
s color in order to |
| 47 // try to express the expectation that Skia can not away the color f
ilter. Due to |
| 48 // non-pm-to-pm-to-non-pm conversions, this probably is not exactly
correct. |
| 49 p->setColor(SkColorSetARGB(255, 0, 254, 0)); |
| 50 return fOnce++ < 1; |
| 51 } |
| 52 private: |
| 53 int fOnce; |
| 54 }; |
| 55 }; |
| 56 |
| 57 SkFlattenable* GetSaveCountAssertLooper::CreateProc(SkReadBuffer&) { |
| 58 return SkNEW(GetSaveCountAssertLooper); |
| 59 } |
| 60 |
| 61 } |
| 62 |
| 63 DEF_TEST(SkCanvas_GetSaveCountInDrawLooperAssert, reporter) { |
| 64 SkBitmap dst; |
| 65 dst.allocN32Pixels(10, 10); |
| 66 dst.eraseColor(SK_ColorTRANSPARENT); |
| 67 |
| 68 SkCanvas canvas(dst); |
| 69 SkPaint paint; |
| 70 { |
| 71 SkAutoTUnref<SkColorFilter> addGreenCF( |
| 72 SkColorFilter::CreateModeFilter(SkColorSetARGB(64, 0, 4, 0), SkXferm
ode::kPlus_Mode)); |
| 73 SkAutoTUnref<SkImageFilter> addGreenIF( |
| 74 SkColorFilterImageFilter::Create(addGreenCF)); |
| 75 |
| 76 // This would trigger the assert upon a draw. It is a color filter that
adds (roughly) 1 to |
| 77 // the green component. |
| 78 paint.setImageFilter(addGreenIF); |
| 79 |
| 80 SkAutoTUnref<SkDrawLooper> looper(SkNEW(GetSaveCountAssertLooper)); |
| 81 paint.setLooper(looper); |
| 82 } |
| 83 paint.setColor(SK_ColorRED); |
| 84 paint.setStrokeWidth(1); |
| 85 paint.setStyle(SkPaint::kStroke_Style); |
| 86 canvas.drawPoint(0, 0, paint); |
| 87 |
| 88 uint32_t pixel = 0; |
| 89 SkImageInfo info = SkImageInfo::Make(1, 1, kBGRA_8888_SkColorType, kUnpremul
_SkAlphaType); |
| 90 canvas.readPixels(info, &pixel, 4, 0, 0); |
| 91 REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN); |
| 92 } |
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