LayerDrawLooperTest.cpp revision e2eac8b2fd8966cc9af51f8d40151dad6c591d2e 
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 "Test.h"
9#include "SkBitmap.h"
10#include "SkBitmapDevice.h"
11#include "SkCanvas.h"
12#include "SkDraw.h"
13#include "SkLayerDrawLooper.h"
14#include "SkMatrix.h"
15#include "SkPaint.h"
16#include "SkRect.h"
17#include "SkRefCnt.h"
18#include "SkScalar.h"
19#include "SkXfermode.h"
20
21class FakeDevice : public SkBitmapDevice {
22public:
23    FakeDevice() : SkBitmapDevice(SkBitmap::kARGB_8888_Config, 100, 100, false) { }
24
25    virtual void drawRect(const SkDraw& draw, const SkRect& r,
26                          const SkPaint& paint) SK_OVERRIDE {
27        fLastMatrix = *draw.fMatrix;
28        INHERITED::drawRect(draw, r, paint);
29    }
30
31    SkMatrix fLastMatrix;
32
33private:
34    typedef SkBitmapDevice INHERITED;
35};
36
37static void test_frontToBack(skiatest::Reporter* reporter) {
38    SkAutoTUnref<SkLayerDrawLooper> looper(SkNEW(SkLayerDrawLooper));
39    SkLayerDrawLooper::LayerInfo layerInfo;
40
41    // Add the front layer, with the defaults.
42    (void)looper->addLayer(layerInfo);
43
44    // Add the back layer, with some layer info set.
45    layerInfo.fOffset.set(10.0f, 20.0f);
46    layerInfo.fPaintBits |= SkLayerDrawLooper::kXfermode_Bit;
47    SkPaint* layerPaint = looper->addLayer(layerInfo);
48    layerPaint->setXfermodeMode(SkXfermode::kSrc_Mode);
49
50    FakeDevice device;
51    SkCanvas canvas(&device);
52    SkPaint paint;
53    looper->init(&canvas);
54
55    // The back layer should come first.
56    REPORTER_ASSERT(reporter, looper->next(&canvas, &paint));
57    REPORTER_ASSERT(reporter, SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrc_Mode));
58    canvas.drawRect(SkRect::MakeWH(50.0f, 50.0f), paint);
59    REPORTER_ASSERT(reporter, 10.0f == device.fLastMatrix.getTranslateX());
60    REPORTER_ASSERT(reporter, 20.0f == device.fLastMatrix.getTranslateY());
61    paint.reset();
62
63    // Then the front layer.
64    REPORTER_ASSERT(reporter, looper->next(&canvas, &paint));
65    REPORTER_ASSERT(reporter, SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode));
66    canvas.drawRect(SkRect::MakeWH(50.0f, 50.0f), paint);
67    REPORTER_ASSERT(reporter, 0.0f == device.fLastMatrix.getTranslateX());
68    REPORTER_ASSERT(reporter, 0.0f == device.fLastMatrix.getTranslateY());
69
70    // Only two layers were added, so that should be the end.
71    REPORTER_ASSERT(reporter, !looper->next(&canvas, &paint));
72}
73
74static void test_backToFront(skiatest::Reporter* reporter) {
75    SkAutoTUnref<SkLayerDrawLooper> looper(SkNEW(SkLayerDrawLooper));
76    SkLayerDrawLooper::LayerInfo layerInfo;
77
78    // Add the back layer, with the defaults.
79    (void)looper->addLayerOnTop(layerInfo);
80
81    // Add the front layer, with some layer info set.
82    layerInfo.fOffset.set(10.0f, 20.0f);
83    layerInfo.fPaintBits |= SkLayerDrawLooper::kXfermode_Bit;
84    SkPaint* layerPaint = looper->addLayerOnTop(layerInfo);
85    layerPaint->setXfermodeMode(SkXfermode::kSrc_Mode);
86
87    FakeDevice device;
88    SkCanvas canvas(&device);
89    SkPaint paint;
90    looper->init(&canvas);
91
92    // The back layer should come first.
93    REPORTER_ASSERT(reporter, looper->next(&canvas, &paint));
94    REPORTER_ASSERT(reporter, SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode));
95    canvas.drawRect(SkRect::MakeWH(50.0f, 50.0f), paint);
96    REPORTER_ASSERT(reporter, 0.0f == device.fLastMatrix.getTranslateX());
97    REPORTER_ASSERT(reporter, 0.0f == device.fLastMatrix.getTranslateY());
98    paint.reset();
99
100    // Then the front layer.
101    REPORTER_ASSERT(reporter, looper->next(&canvas, &paint));
102    REPORTER_ASSERT(reporter, SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrc_Mode));
103    canvas.drawRect(SkRect::MakeWH(50.0f, 50.0f), paint);
104    REPORTER_ASSERT(reporter, 10.0f == device.fLastMatrix.getTranslateX());
105    REPORTER_ASSERT(reporter, 20.0f == device.fLastMatrix.getTranslateY());
106
107    // Only two layers were added, so that should be the end.
108    REPORTER_ASSERT(reporter, !looper->next(&canvas, &paint));
109}
110
111static void test_mixed(skiatest::Reporter* reporter) {
112    SkAutoTUnref<SkLayerDrawLooper> looper(SkNEW(SkLayerDrawLooper));
113    SkLayerDrawLooper::LayerInfo layerInfo;
114
115    // Add the back layer, with the defaults.
116    (void)looper->addLayer(layerInfo);
117
118    // Add the front layer, with some layer info set.
119    layerInfo.fOffset.set(10.0f, 20.0f);
120    layerInfo.fPaintBits |= SkLayerDrawLooper::kXfermode_Bit;
121    SkPaint* layerPaint = looper->addLayerOnTop(layerInfo);
122    layerPaint->setXfermodeMode(SkXfermode::kSrc_Mode);
123
124    FakeDevice device;
125    SkCanvas canvas(&device);
126    SkPaint paint;
127    looper->init(&canvas);
128
129    // The back layer should come first.
130    REPORTER_ASSERT(reporter, looper->next(&canvas, &paint));
131    REPORTER_ASSERT(reporter, SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode));
132    canvas.drawRect(SkRect::MakeWH(50.0f, 50.0f), paint);
133    REPORTER_ASSERT(reporter, 0.0f == device.fLastMatrix.getTranslateX());
134    REPORTER_ASSERT(reporter, 0.0f == device.fLastMatrix.getTranslateY());
135    paint.reset();
136
137    // Then the front layer.
138    REPORTER_ASSERT(reporter, looper->next(&canvas, &paint));
139    REPORTER_ASSERT(reporter, SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrc_Mode));
140    canvas.drawRect(SkRect::MakeWH(50.0f, 50.0f), paint);
141    REPORTER_ASSERT(reporter, 10.0f == device.fLastMatrix.getTranslateX());
142    REPORTER_ASSERT(reporter, 20.0f == device.fLastMatrix.getTranslateY());
143
144    // Only two layers were added, so that should be the end.
145    REPORTER_ASSERT(reporter, !looper->next(&canvas, &paint));
146}
147
148DEF_TEST(LayerDrawLooper, reporter) {
149    test_frontToBack(reporter);
150    test_backToFront(reporter);
151    test_mixed(reporter);
152}
153