1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "FontUtils.h"
18
19 #include <gtest/gtest.h>
20
21 namespace minikin {
22 namespace {
23
MakeTag(char c1,char c2,char c3,char c4)24 constexpr uint32_t MakeTag(char c1, char c2, char c3, char c4) {
25 return ((uint32_t)c1 << 24) | ((uint32_t)c2 << 16) | ((uint32_t)c3 << 8) | (uint32_t)c4;
26 }
27
writeU16(uint16_t x,uint8_t * out,size_t offset)28 static size_t writeU16(uint16_t x, uint8_t* out, size_t offset) {
29 out[offset] = x >> 8;
30 out[offset + 1] = x;
31 return offset + 2;
32 }
33
writeU32(uint32_t x,uint8_t * out,size_t offset)34 static size_t writeU32(uint32_t x, uint8_t* out, size_t offset) {
35 out[offset] = x >> 24;
36 out[offset + 1] = x >> 16;
37 out[offset + 2] = x >> 8;
38 out[offset + 3] = x;
39 return offset + 4;
40 }
41
floatToFixed(float x)42 static uint32_t floatToFixed(float x) {
43 return (uint32_t)(x * 65536);
44 }
45
46 struct Fvar {
Fvarminikin::__anon097d31760111::Fvar47 Fvar(uint32_t tag, float minValue, float defaultValue, float maxValue)
48 : tag(tag), minValue(minValue), defaultValue(defaultValue), maxValue(maxValue) {}
49
50 uint32_t tag;
51 float minValue;
52 float defaultValue;
53 float maxValue;
54 };
55
56 // Returns valid fvar table contents. No InstanceRecord are filled.
buildFvarTable(const std::vector<Fvar> & fvars)57 static std::vector<uint8_t> buildFvarTable(const std::vector<Fvar>& fvars) {
58 const uint32_t HEADER_SIZE = 0x10;
59 const uint32_t AXIS_RECORD_SIZE = 0x14;
60 std::vector<uint8_t> out(HEADER_SIZE + fvars.size() * AXIS_RECORD_SIZE);
61 size_t head = writeU16(1, out.data(), 0); // major version
62 head = writeU16(0, out.data(), head); // minor version
63 head = writeU16(HEADER_SIZE, out.data(), head); // axes array offset
64 head = writeU16(2, out.data(), head); // reserved
65 head = writeU16(fvars.size(), out.data(), head); // count of axes
66 head = writeU16(AXIS_RECORD_SIZE, out.data(), head); // size of variaiton axis record
67 head = writeU16(0, out.data(), head); // number of instance record count
68 head = writeU16(0, out.data(), head); // instance record size
69
70 for (const Fvar& fvar : fvars) {
71 head = writeU32(fvar.tag, out.data(), head);
72 head = writeU32(floatToFixed(fvar.minValue), out.data(), head);
73 head = writeU32(floatToFixed(fvar.defaultValue), out.data(), head);
74 head = writeU32(floatToFixed(fvar.maxValue), out.data(), head);
75 head = writeU16(0, out.data(), head); // flags
76 head = writeU16(0, out.data(), head); // axis name ID
77 }
78
79 return out;
80 }
81
TEST(FontUtilsTest,analyzeAxes_tagCount)82 TEST(FontUtilsTest, analyzeAxes_tagCount) {
83 std::vector<uint8_t> fvarTable = buildFvarTable({
84 Fvar(MakeTag('w', 'd', 't', 'h'), 0.0f, 1.0f, 2.0f),
85 Fvar(MakeTag('w', 'g', 'h', 't'), 0.0f, 1.0f, 2.0f),
86 });
87
88 std::unordered_set<uint32_t> axes;
89 ASSERT_TRUE(analyzeAxes(fvarTable.data(), fvarTable.size(), &axes));
90 ASSERT_EQ(2u, axes.size());
91 EXPECT_EQ(1u, axes.count(MakeTag('w', 'd', 't', 'h')));
92 EXPECT_EQ(1u, axes.count(MakeTag('w', 'g', 'h', 't')));
93 EXPECT_EQ(0u, axes.count(MakeTag('s', 'l', 'n', 't')));
94 }
95
TEST(FontUtilsTest,analyzeAxes_emptyBuffer)96 TEST(FontUtilsTest, analyzeAxes_emptyBuffer) {
97 std::vector<uint8_t> fvarTable;
98 std::unordered_set<uint32_t> axes;
99 ASSERT_FALSE(analyzeAxes(fvarTable.data(), fvarTable.size(), &axes));
100 }
101
TEST(FontUtilsTest,analyzeAxes_invalidTableSize)102 TEST(FontUtilsTest, analyzeAxes_invalidTableSize) {
103 std::vector<uint8_t> fvarTable = buildFvarTable({
104 Fvar(MakeTag('w', 'd', 't', 'h'), 0.0f, 1.0f, 2.0f),
105 Fvar(MakeTag('w', 'g', 'h', 't'), 0.0f, 1.0f, 2.0f),
106 });
107
108 fvarTable.resize(1000);
109 writeU16(50, fvarTable.data(), 8); // Set axisCount = 50
110
111 std::unordered_set<uint32_t> axes;
112 ASSERT_FALSE(analyzeAxes(fvarTable.data(), fvarTable.size(), &axes));
113 }
114
115 } // namespace
116 } // namespace minikin
117