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