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      1 /*
      2  * Copyright 2014 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 "SkDeque.h"
      9 #include "SkLayerRasterizer.h"
     10 #include "SkPaint.h"
     11 #include "SkRasterizer.h"
     12 #include "Test.h"
     13 
     14 class SkReadBuffer;
     15 
     16 // Dummy class to place on a paint just to ensure the paint's destructor
     17 // is called.
     18 // ONLY to be used by LayerRasterizer_destructor, since other tests may
     19 // be run in a separate thread, and this class is not threadsafe.
     20 class DummyRasterizer : public SkRasterizer {
     21 public:
     22     DummyRasterizer()
     23         : INHERITED()
     24     {
     25         // Not threadsafe. Only used in one thread.
     26         gCount++;
     27     }
     28 
     29     ~DummyRasterizer() {
     30         // Not threadsafe. Only used in one thread.
     31         gCount--;
     32     }
     33 
     34     static int GetCount() { return gCount; }
     35 
     36     SK_DECLARE_NOT_FLATTENABLE_PROCS(DummyRasterizer)
     37 
     38 private:
     39     static int gCount;
     40 
     41     typedef SkRasterizer INHERITED;
     42 };
     43 
     44 int DummyRasterizer::gCount;
     45 
     46 // Check to make sure that the SkPaint in the layer has its destructor called.
     47 DEF_TEST(LayerRasterizer_destructor, reporter) {
     48     {
     49         SkPaint paint;
     50         paint.setRasterizer(SkNEW(DummyRasterizer))->unref();
     51         REPORTER_ASSERT(reporter, DummyRasterizer::GetCount() == 1);
     52 
     53         SkLayerRasterizer::Builder builder;
     54         builder.addLayer(paint);
     55     }
     56     REPORTER_ASSERT(reporter, DummyRasterizer::GetCount() == 0);
     57 }
     58 
     59 class LayerRasterizerTester {
     60 public:
     61     static int CountLayers(const SkLayerRasterizer& layerRasterizer) {
     62         return layerRasterizer.fLayers->count();
     63     }
     64 
     65     static const SkDeque& GetLayers(const SkLayerRasterizer& layerRasterizer) {
     66         return *layerRasterizer.fLayers;
     67     }
     68 };
     69 
     70 // MUST stay in sync with definition of SkLayerRasterizer_Rec in SkLayerRasterizer.cpp.
     71 struct SkLayerRasterizer_Rec {
     72     SkPaint     fPaint;
     73     SkVector    fOffset;
     74 };
     75 
     76 static bool equals(const SkLayerRasterizer_Rec& rec1, const SkLayerRasterizer_Rec& rec2) {
     77     return rec1.fPaint == rec2.fPaint && rec1.fOffset == rec2.fOffset;
     78 }
     79 
     80 DEF_TEST(LayerRasterizer_copy, reporter) {
     81     SkLayerRasterizer::Builder builder;
     82     REPORTER_ASSERT(reporter, NULL == builder.snapshotRasterizer());
     83     SkPaint paint;
     84     // Create a bunch of paints with different flags.
     85     for (uint32_t flags = 0x01; flags < SkPaint::kAllFlags; flags <<= 1) {
     86         paint.setFlags(flags);
     87         builder.addLayer(paint, static_cast<SkScalar>(flags), static_cast<SkScalar>(flags));
     88     }
     89 
     90     // Create a layer rasterizer with all the existing layers.
     91     SkAutoTUnref<SkLayerRasterizer> firstCopy(builder.snapshotRasterizer());
     92 
     93     // Add one more layer.
     94     paint.setFlags(SkPaint::kAllFlags);
     95     builder.addLayer(paint);
     96 
     97     SkAutoTUnref<SkLayerRasterizer> oneLarger(builder.snapshotRasterizer());
     98     SkAutoTUnref<SkLayerRasterizer> detached(builder.detachRasterizer());
     99 
    100     // Check the counts for consistency.
    101     const int largerCount = LayerRasterizerTester::CountLayers(*oneLarger.get());
    102     const int smallerCount = LayerRasterizerTester::CountLayers(*firstCopy.get());
    103     REPORTER_ASSERT(reporter, largerCount == LayerRasterizerTester::CountLayers(*detached.get()));
    104     REPORTER_ASSERT(reporter, smallerCount == largerCount - 1);
    105 
    106     const SkLayerRasterizer_Rec* recFirstCopy = NULL;
    107     const SkLayerRasterizer_Rec* recOneLarger = NULL;
    108     const SkLayerRasterizer_Rec* recDetached = NULL;
    109 
    110     const SkDeque& layersFirstCopy = LayerRasterizerTester::GetLayers(*firstCopy.get());
    111     const SkDeque& layersOneLarger = LayerRasterizerTester::GetLayers(*oneLarger.get());
    112     const SkDeque& layersDetached = LayerRasterizerTester::GetLayers(*detached.get());
    113 
    114     // Ensure that our version of SkLayerRasterizer_Rec is the same as the one in
    115     // SkLayerRasterizer.cpp - or at least the same size. If the order were switched, we
    116     // would fail the test elsewhere.
    117     REPORTER_ASSERT(reporter, layersFirstCopy.elemSize() == sizeof(SkLayerRasterizer_Rec));
    118     REPORTER_ASSERT(reporter, layersOneLarger.elemSize() == sizeof(SkLayerRasterizer_Rec));
    119     REPORTER_ASSERT(reporter, layersDetached.elemSize() == sizeof(SkLayerRasterizer_Rec));
    120 
    121     SkDeque::F2BIter iterFirstCopy(layersFirstCopy);
    122     SkDeque::F2BIter iterOneLarger(layersOneLarger);
    123     SkDeque::F2BIter iterDetached(layersDetached);
    124 
    125     for (int i = 0; i < largerCount; ++i) {
    126         recFirstCopy = static_cast<const SkLayerRasterizer_Rec*>(iterFirstCopy.next());
    127         recOneLarger = static_cast<const SkLayerRasterizer_Rec*>(iterOneLarger.next());
    128         recDetached  = static_cast<const SkLayerRasterizer_Rec*>(iterDetached.next());
    129 
    130         REPORTER_ASSERT(reporter, equals(*recOneLarger, *recDetached));
    131         if (smallerCount == i) {
    132             REPORTER_ASSERT(reporter, recFirstCopy == NULL);
    133         } else {
    134             REPORTER_ASSERT(reporter, equals(*recFirstCopy, *recOneLarger));
    135         }
    136     }
    137 }
    138 
    139 DEF_TEST(LayerRasterizer_detachEmpty, reporter) {
    140     SkLayerRasterizer::Builder builder;
    141     REPORTER_ASSERT(reporter, NULL == builder.detachRasterizer());
    142 }
    143