1 /*
2 * Copyright 2011-2016 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 "SkPaint.h"
9 #include "Test.h"
10
test_monotonic(skiatest::Reporter * reporter,const SkPaint & paint,const char * msg)11 static void test_monotonic(skiatest::Reporter* reporter,
12 const SkPaint& paint,
13 const char* msg) {
14 const char* text = "sdfkljAKLDFJKEWkldfjlk#$%&sdfs.dsj";
15 const size_t length = strlen(text);
16 const SkScalar width = paint.measureText(text, length);
17
18 SkScalar mm = 0;
19 size_t nn = 0;
20 const SkScalar step = SkMaxScalar(width / 10, SK_Scalar1);
21 for (SkScalar w = 0; w <= width; w += step) {
22 SkScalar m;
23 const size_t n = paint.breakText(text, length, w, &m);
24
25 REPORTER_ASSERT_MESSAGE(reporter, n <= length, msg);
26 REPORTER_ASSERT_MESSAGE(reporter, m <= width, msg);
27
28 if (n == 0) {
29 REPORTER_ASSERT_MESSAGE(reporter, m == 0, msg);
30 } else {
31 // now assert that we're monotonic
32 if (n == nn) {
33 REPORTER_ASSERT_MESSAGE(reporter, m == mm, msg);
34 } else {
35 REPORTER_ASSERT_MESSAGE(reporter, n > nn, msg);
36 REPORTER_ASSERT_MESSAGE(reporter, m > mm, msg);
37 }
38 }
39 nn = n;
40 mm = m;
41 }
42 }
43
test_eq_measure_text(skiatest::Reporter * reporter,const SkPaint & paint,const char * msg)44 static void test_eq_measure_text(skiatest::Reporter* reporter,
45 const SkPaint& paint,
46 const char* msg) {
47 const char* text = "The ultimate measure of a man is not where he stands in moments of comfort "
48 "and convenience, but where he stands at times of challenge and controversy.";
49 const size_t length = strlen(text);
50 const SkScalar width = paint.measureText(text, length);
51
52 SkScalar mm;
53 const size_t length2 = paint.breakText(text, length, width, &mm);
54 REPORTER_ASSERT_MESSAGE(reporter, length2 == length, msg);
55 REPORTER_ASSERT_MESSAGE(reporter, mm == width, msg);
56 }
57
test_long_text(skiatest::Reporter * reporter,const SkPaint & paint,const char * msg)58 static void test_long_text(skiatest::Reporter* reporter,
59 const SkPaint& paint,
60 const char* msg) {
61 static const int kSize = 16 * 1024;
62 SkAutoMalloc block(kSize);
63 memset(block.get(), 'a', kSize - 1);
64 char* text = static_cast<char*>(block.get());
65 text[kSize - 1] = '\0';
66 const SkScalar width = paint.measureText(text, kSize);
67
68 SkScalar mm;
69 const size_t length = paint.breakText(text, kSize, width, &mm);
70 REPORTER_ASSERT_MESSAGE(reporter, length == kSize, msg);
71 REPORTER_ASSERT_MESSAGE(reporter, mm == width, msg);
72 }
73
DEF_TEST(PaintBreakText,reporter)74 DEF_TEST(PaintBreakText, reporter) {
75 SkPaint paint;
76 test_monotonic(reporter, paint, "default");
77 test_eq_measure_text(reporter, paint, "default");
78 test_long_text(reporter, paint, "default");
79 paint.setTextSize(SkIntToScalar(1 << 17));
80 test_monotonic(reporter, paint, "huge text size");
81 test_eq_measure_text(reporter, paint, "huge text size");
82 paint.setTextSize(0);
83 test_monotonic(reporter, paint, "zero text size");
84 }
85