1 /*
2 * Copyright 2011 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 "include/core/SkAlphaType.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkImageInfo.h"
12 #include "include/core/SkPoint.h"
13 #include "include/core/SkRefCnt.h"
14 #include "include/core/SkSamplingOptions.h"
15 #include "include/core/SkScalar.h"
16 #include "include/core/SkShader.h"
17 #include "include/core/SkTileMode.h"
18 #include "include/effects/SkGradientShader.h"
19 #include "tests/Test.h"
20
test_bitmap(skiatest::Reporter * reporter)21 static void test_bitmap(skiatest::Reporter* reporter) {
22 SkImageInfo info = SkImageInfo::MakeN32Premul(2, 2);
23
24 SkBitmap bmp;
25 bmp.setInfo(info);
26
27 // test 1: bitmap without pixel data
28 auto shader = bmp.makeShader(SkSamplingOptions());
29 REPORTER_ASSERT(reporter, shader);
30 REPORTER_ASSERT(reporter, !shader->isOpaque());
31
32 // From this point on, we have pixels
33 bmp.allocPixels(info);
34
35 // test 2: not opaque by default
36 shader = bmp.makeShader(SkSamplingOptions());
37 REPORTER_ASSERT(reporter, shader);
38 REPORTER_ASSERT(reporter, !shader->isOpaque());
39
40 // test 3: explicitly opaque
41 bmp.setAlphaType(kOpaque_SkAlphaType);
42 shader = bmp.makeShader(SkSamplingOptions());
43 REPORTER_ASSERT(reporter, shader);
44 REPORTER_ASSERT(reporter, shader->isOpaque());
45
46 // test 4: explicitly not opaque
47 bmp.setAlphaType(kPremul_SkAlphaType);
48 shader = bmp.makeShader(SkSamplingOptions());
49 REPORTER_ASSERT(reporter, shader);
50 REPORTER_ASSERT(reporter, !shader->isOpaque());
51 }
52
test_gradient(skiatest::Reporter * reporter)53 static void test_gradient(skiatest::Reporter* reporter) {
54 SkPoint pts[2];
55 pts[0].iset(0, 0);
56 pts[1].iset(1, 0);
57 SkColor colors[2];
58 SkScalar pos[2] = {SkIntToScalar(0), SkIntToScalar(1)};
59 int count = 2;
60 SkTileMode mode = SkTileMode::kClamp;
61
62 // test 1: all opaque
63 colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
64 colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
65 auto grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
66 REPORTER_ASSERT(reporter, grad);
67 REPORTER_ASSERT(reporter, grad->isOpaque());
68
69 // test 2: all 0 alpha
70 colors[0] = SkColorSetARGB(0, 0, 0, 0);
71 colors[1] = SkColorSetARGB(0, 0, 0, 0);
72 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
73 REPORTER_ASSERT(reporter, grad);
74 REPORTER_ASSERT(reporter, !grad->isOpaque());
75
76 // test 3: one opaque, one transparent
77 colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
78 colors[1] = SkColorSetARGB(0x40, 0, 0, 0);
79 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
80 REPORTER_ASSERT(reporter, grad);
81 REPORTER_ASSERT(reporter, !grad->isOpaque());
82
83 // test 4: test 3, swapped
84 colors[0] = SkColorSetARGB(0x40, 0, 0, 0);
85 colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
86 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
87 REPORTER_ASSERT(reporter, grad);
88 REPORTER_ASSERT(reporter, !grad->isOpaque());
89 }
90
test_color(skiatest::Reporter * reporter)91 static void test_color(skiatest::Reporter* reporter) {
92 sk_sp<SkShader> colorShader1 = SkShaders::Color(SkColorSetARGB(0,0,0,0));
93 REPORTER_ASSERT(reporter, !colorShader1->isOpaque());
94 sk_sp<SkShader> colorShader2 = SkShaders::Color(SkColorSetARGB(0xFF,0,0,0));
95 REPORTER_ASSERT(reporter, colorShader2->isOpaque());
96 sk_sp<SkShader> colorShader3 = SkShaders::Color(SkColorSetARGB(0x7F,0,0,0));
97 REPORTER_ASSERT(reporter, !colorShader3->isOpaque());
98 }
99
DEF_TEST(ShaderOpacity,reporter)100 DEF_TEST(ShaderOpacity, reporter) {
101 test_gradient(reporter);
102 test_color(reporter);
103 test_bitmap(reporter);
104 }
105