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
assert_color(skiatest::Reporter * reporter,SkColor expected,SkColor actual,int tolerance)18 static 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
assert_color(skiatest::Reporter * reporter,SkColor expected,SkColor actual)26 static 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 */
test_colorMatrixCTS(skiatest::Reporter * reporter)35 static 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
DEF_TEST(ColorMatrix,reporter)99 DEF_TEST(ColorMatrix, reporter) {
100 test_colorMatrixCTS(reporter);
101 }
102