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Side by Side Diff: tests/CanvasStateTest.cpp

Issue 23545017: Create a semi-stable API for capturing the state of an SkCanvas and reconstructing that state acros… (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: fixing nits Created 7 years, 3 months ago
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1
2 /*
3 * Copyright 2013 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9 #include "Test.h"
10 #include "SkCanvas.h"
11 #include "SkCanvasStateUtils.h"
12 #include "SkDevice.h"
13 #include "SkDrawFilter.h"
14 #include "SkPaint.h"
15 #include "SkRect.h"
16 #include "SkRRect.h"
17
18 static void test_complex_layers(skiatest::Reporter* reporter) {
19
20 const int WIDTH = 400;
21 const int HEIGHT = 400;
22 const int SPACER = 10;
23
24 SkRect rect = SkRect::MakeXYWH(SPACER, SPACER, WIDTH-(2*SPACER), (HEIGHT-(2* SPACER)) / 7);
25
26 const SkBitmap::Config configs[] = { SkBitmap::kRGB_565_Config,
27 SkBitmap::kARGB_8888_Config
28 };
29 const int configCount = sizeof(configs) / sizeof(SkBitmap::Config);
scroggo 2013/08/29 17:24:07 Won't this cause a warning somewhere (size_t to in
30
31 const int layerAlpha[] = { 255, 255, 0 };
32 const SkCanvas::SaveFlags flags[] = { SkCanvas::kARGB_NoClipLayer_SaveFlag,
33 SkCanvas::kARGB_ClipLayer_SaveFlag,
34 SkCanvas::kARGB_NoClipLayer_SaveFlag
35 };
36 REPORTER_ASSERT(reporter, sizeof(layerAlpha) == sizeof(flags));
37 const int layerCombinations = sizeof(layerAlpha) / sizeof(int);
scroggo 2013/08/29 17:24:07 Warning?
38
39 for (int i = 0; i < configCount; ++i) {
40 SkBitmap bitmaps[2];
41 for (int j = 0; j < 2; ++j) {
42 bitmaps[j].setConfig(configs[i], WIDTH, HEIGHT);
43 bitmaps[j].allocPixels();
44
45 SkCanvas canvas(bitmaps[j]);
46
47 canvas.drawColor(SK_ColorRED);
48
49 for (int k = 0; k < layerCombinations; ++k) {
50 // draw a rect within the layer's bounds and again outside the l ayer's bounds
51 canvas.saveLayerAlpha(&rect, layerAlpha[k], flags[k]);
52
53 SkCanvasState* state = NULL;
54 SkCanvas* tmpCanvas = NULL;
55 if (j) {
56 state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
57 REPORTER_ASSERT(reporter, state);
58 tmpCanvas = SkCanvasStateUtils::CreateFromCanvasState(state) ;
59 REPORTER_ASSERT(reporter, tmpCanvas);
60 } else {
61 tmpCanvas = SkRef(&canvas);
62 }
63
64 SkPaint bluePaint;
65 bluePaint.setColor(SK_ColorBLUE);
66 bluePaint.setStyle(SkPaint::kFill_Style);
67
68 tmpCanvas->drawRect(rect, bluePaint);
69 tmpCanvas->translate(0, rect.height() + SPACER);
70 tmpCanvas->drawRect(rect, bluePaint);
71
72 tmpCanvas->unref();
73 SkCanvasStateUtils::ReleaseCanvasState(state);
74
75 canvas.restore();
76
77 // translate the canvas for the next iteration
78 canvas.translate(0, 2*(rect.height() + SPACER));
79 }
80 }
81
82 // now we memcmp the two bitmaps
83 REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
84 REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
85 bitmaps[1].getPixels(),
86 bitmaps[0].getSize()));
87 }
88 }
89
90 ////////////////////////////////////////////////////////////////////////////////
91
92 class TestDrawFilter : public SkDrawFilter {
93 public:
94 virtual bool filter(SkPaint*, Type) SK_OVERRIDE { return true; }
95 };
96
97 static void test_draw_filters(skiatest::Reporter* reporter) {
98 TestDrawFilter drawFilter;
99 SkDevice device(SkBitmap::kARGB_8888_Config, 10, 10);
100 SkCanvas canvas(&device);
101
102 canvas.setDrawFilter(&drawFilter);
103
104 SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
105 REPORTER_ASSERT(reporter, state);
106 SkCanvas* tmpCanvas = SkCanvasStateUtils::CreateFromCanvasState(state);
107 REPORTER_ASSERT(reporter, tmpCanvas);
108
109 REPORTER_ASSERT(reporter, NULL != canvas.getDrawFilter());
110 REPORTER_ASSERT(reporter, NULL == tmpCanvas->getDrawFilter());
111
112 tmpCanvas->unref();
113 SkCanvasStateUtils::ReleaseCanvasState(state);
114 }
115
116 ////////////////////////////////////////////////////////////////////////////////
117
118 static void test_soft_clips(skiatest::Reporter* reporter) {
119 SkDevice device(SkBitmap::kARGB_8888_Config, 10, 10);
120 SkCanvas canvas(&device);
121
122 SkRRect roundRect;
123 roundRect.setOval(SkRect::MakeWH(5, 5));
124
125 canvas.clipRRect(roundRect, SkRegion::kIntersect_Op, true);
126
127 SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
128 REPORTER_ASSERT(reporter, !state);
129 }
130
131 ////////////////////////////////////////////////////////////////////////////////
132
133 static void test_canvas_state_utils(skiatest::Reporter* reporter) {
134 test_complex_layers(reporter);
135 test_draw_filters(reporter);
136 test_soft_clips(reporter);
137 }
138
139 #include "TestClassDef.h"
140 DEFINE_TESTCLASS("CanvasState", TestCanvasStateClass, test_canvas_state_utils)
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