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