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    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
49static 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
87static 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
96DEF_TEST(ShaderOpacity, reporter) {
97    test_gradient(reporter);
98    test_color(reporter);
99    test_bitmap(reporter);
100}
101