ColorMatrixTest.cpp revision f809d7687a4fb7b88b651b046da2bc0035d6aa09 
1/*
2 * Copyright 2015 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 "Test.h"
9
10#include "SkBitmap.h"
11#include "SkCanvas.h"
12#include "SkColor.h"
13#include "SkColorMatrixFilter.h"
14#include "SkPaint.h"
15
16#include <stdlib.h>
17
18static inline void assert_color(skiatest::Reporter* reporter,
19                                SkColor expected, SkColor actual, int tolerance) {
20    REPORTER_ASSERT(reporter, abs((int)(SkColorGetA(expected) - SkColorGetA(actual))) <= tolerance);
21    REPORTER_ASSERT(reporter, abs((int)(SkColorGetR(expected) - SkColorGetR(actual))) <= tolerance);
22    REPORTER_ASSERT(reporter, abs((int)(SkColorGetG(expected) - SkColorGetG(actual))) <= tolerance);
23    REPORTER_ASSERT(reporter, abs((int)(SkColorGetB(expected) - SkColorGetB(actual))) <= tolerance);
24}
25
26static inline void assert_color(skiatest::Reporter* reporter, SkColor expected, SkColor actual) {
27    const int TOLERANCE = 1;
28    assert_color(reporter, expected, actual, TOLERANCE);
29}
30
31/**
32 * This test case is a mirror of the Android CTS tests for MatrixColorFilter
33 * found in the android.graphics.ColorMatrixColorFilterTest class.
34 */
35static inline void test_colorMatrixCTS(skiatest::Reporter* reporter) {
36
37    SkBitmap bitmap;
38    bitmap.allocN32Pixels(1,1);
39
40    SkCanvas canvas(bitmap);
41    SkPaint paint;
42
43    SkScalar blueToCyan[20] = {
44            1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
45            0.0f, 1.0f, 1.0f, 0.0f, 0.0f,
46            0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
47            0.0f, 0.0f, 0.0f, 1.0f, 0.0f };
48    paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(blueToCyan));
49
50    paint.setColor(SK_ColorBLUE);
51    canvas.drawPoint(0, 0, paint);
52    assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));
53
54    paint.setColor(SK_ColorGREEN);
55    canvas.drawPoint(0, 0, paint);
56    assert_color(reporter, SK_ColorGREEN, bitmap.getColor(0, 0));
57
58    paint.setColor(SK_ColorRED);
59    canvas.drawPoint(0, 0, paint);
60    assert_color(reporter, SK_ColorRED, bitmap.getColor(0, 0));
61
62    // color components are clipped, not scaled
63    paint.setColor(SK_ColorMAGENTA);
64    canvas.drawPoint(0, 0, paint);
65    assert_color(reporter, SK_ColorWHITE, bitmap.getColor(0, 0));
66
67    SkScalar transparentRedAddBlue[20] = {
68            1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
69            0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
70            0.0f, 0.0f, 1.0f, 0.0f, 64.0f,
71           -0.5f, 0.0f, 0.0f, 1.0f, 0.0f
72    };
73    paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(transparentRedAddBlue));
74    bitmap.eraseColor(SK_ColorTRANSPARENT);
75
76    paint.setColor(SK_ColorRED);
77    canvas.drawPoint(0, 0, paint);
78    assert_color(reporter, SkColorSetARGB(128, 255, 0, 64), bitmap.getColor(0, 0), 2);
79
80    paint.setColor(SK_ColorCYAN);
81    canvas.drawPoint(0, 0, paint);
82    // blue gets clipped
83    assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));
84
85    // change array to filter out green
86    REPORTER_ASSERT(reporter, 1.0f == transparentRedAddBlue[6]);
87    transparentRedAddBlue[6] = 0.0f;
88
89    // check that changing the array has no effect
90    canvas.drawPoint(0, 0, paint);
91    assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));
92
93    // create a new filter with the changed matrix
94    paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(transparentRedAddBlue));
95    canvas.drawPoint(0, 0, paint);
96    assert_color(reporter, SK_ColorBLUE, bitmap.getColor(0, 0));
97}
98
99DEF_TEST(ColorMatrix, reporter) {
100    test_colorMatrixCTS(reporter);
101}
102