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
13static 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    SkShader* shader = SkShader::CreateBitmapShader(bmp,
21        SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
22    REPORTER_ASSERT(reporter, shader);
23    REPORTER_ASSERT(reporter, !shader->isOpaque());
24    shader->unref();
25
26    // From this point on, we have pixels
27    bmp.allocPixels(info);
28
29    // test 2: not opaque by default
30    shader = SkShader::CreateBitmapShader(bmp,
31        SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
32    REPORTER_ASSERT(reporter, shader);
33    REPORTER_ASSERT(reporter, !shader->isOpaque());
34    shader->unref();
35
36    // test 3: explicitly opaque
37    bmp.setAlphaType(kOpaque_SkAlphaType);
38    shader = SkShader::CreateBitmapShader(bmp,
39        SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
40    REPORTER_ASSERT(reporter, shader);
41    REPORTER_ASSERT(reporter, shader->isOpaque());
42    shader->unref();
43
44    // test 4: explicitly not opaque
45    bmp.setAlphaType(kPremul_SkAlphaType);
46    shader = SkShader::CreateBitmapShader(bmp,
47        SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
48    REPORTER_ASSERT(reporter, shader);
49    REPORTER_ASSERT(reporter, !shader->isOpaque());
50    shader->unref();
51
52}
53
54static void test_gradient(skiatest::Reporter* reporter)
55{
56    SkPoint pts[2];
57    pts[0].iset(0, 0);
58    pts[1].iset(1, 0);
59    SkColor colors[2];
60    SkScalar pos[2] = {SkIntToScalar(0), SkIntToScalar(1)};
61    int count = 2;
62    SkShader::TileMode mode = SkShader::kClamp_TileMode;
63
64    // test 1: all opaque
65    colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
66    colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
67    SkShader* grad = SkGradientShader::CreateLinear(pts, colors, pos, count,
68                                                    mode);
69    REPORTER_ASSERT(reporter, grad);
70    REPORTER_ASSERT(reporter, grad->isOpaque());
71    grad->unref();
72
73    // test 2: all 0 alpha
74    colors[0] = SkColorSetARGB(0, 0, 0, 0);
75    colors[1] = SkColorSetARGB(0, 0, 0, 0);
76    grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
77    REPORTER_ASSERT(reporter, grad);
78    REPORTER_ASSERT(reporter, !grad->isOpaque());
79    grad->unref();
80
81    // test 3: one opaque, one transparent
82    colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
83    colors[1] = SkColorSetARGB(0x40, 0, 0, 0);
84    grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
85    REPORTER_ASSERT(reporter, grad);
86    REPORTER_ASSERT(reporter, !grad->isOpaque());
87    grad->unref();
88
89    // test 4: test 3, swapped
90    colors[0] = SkColorSetARGB(0x40, 0, 0, 0);
91    colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
92    grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
93    REPORTER_ASSERT(reporter, grad);
94    REPORTER_ASSERT(reporter, !grad->isOpaque());
95    grad->unref();
96}
97
98static void test_color(skiatest::Reporter* reporter)
99{
100    SkColorShader colorShader1(SkColorSetARGB(0,0,0,0));
101    REPORTER_ASSERT(reporter, !colorShader1.isOpaque());
102    SkColorShader colorShader2(SkColorSetARGB(0xFF,0,0,0));
103    REPORTER_ASSERT(reporter, colorShader2.isOpaque());
104    SkColorShader colorShader3(SkColorSetARGB(0x7F,0,0,0));
105    REPORTER_ASSERT(reporter, !colorShader3.isOpaque());
106}
107
108DEF_TEST(ShaderOpacity, reporter) {
109    test_gradient(reporter);
110    test_color(reporter);
111    test_bitmap(reporter);
112}
113