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117 lines
4.1 KiB
117 lines
4.1 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "FontUtils.h"
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#include <gtest/gtest.h>
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namespace minikin {
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namespace {
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constexpr uint32_t MakeTag(char c1, char c2, char c3, char c4) {
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return ((uint32_t)c1 << 24) | ((uint32_t)c2 << 16) | ((uint32_t)c3 << 8) | (uint32_t)c4;
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}
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static size_t writeU16(uint16_t x, uint8_t* out, size_t offset) {
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out[offset] = x >> 8;
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out[offset + 1] = x;
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return offset + 2;
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}
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static size_t writeU32(uint32_t x, uint8_t* out, size_t offset) {
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out[offset] = x >> 24;
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out[offset + 1] = x >> 16;
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out[offset + 2] = x >> 8;
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out[offset + 3] = x;
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return offset + 4;
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}
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static uint32_t floatToFixed(float x) {
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return (uint32_t)(x * 65536);
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}
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struct Fvar {
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Fvar(uint32_t tag, float minValue, float defaultValue, float maxValue)
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: tag(tag), minValue(minValue), defaultValue(defaultValue), maxValue(maxValue) {}
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uint32_t tag;
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float minValue;
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float defaultValue;
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float maxValue;
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};
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// Returns valid fvar table contents. No InstanceRecord are filled.
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static std::vector<uint8_t> buildFvarTable(const std::vector<Fvar>& fvars) {
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const uint32_t HEADER_SIZE = 0x10;
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const uint32_t AXIS_RECORD_SIZE = 0x14;
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std::vector<uint8_t> out(HEADER_SIZE + fvars.size() * AXIS_RECORD_SIZE);
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size_t head = writeU16(1, out.data(), 0); // major version
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head = writeU16(0, out.data(), head); // minor version
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head = writeU16(HEADER_SIZE, out.data(), head); // axes array offset
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head = writeU16(2, out.data(), head); // reserved
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head = writeU16(fvars.size(), out.data(), head); // count of axes
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head = writeU16(AXIS_RECORD_SIZE, out.data(), head); // size of variaiton axis record
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head = writeU16(0, out.data(), head); // number of instance record count
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head = writeU16(0, out.data(), head); // instance record size
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for (const Fvar& fvar : fvars) {
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head = writeU32(fvar.tag, out.data(), head);
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head = writeU32(floatToFixed(fvar.minValue), out.data(), head);
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head = writeU32(floatToFixed(fvar.defaultValue), out.data(), head);
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head = writeU32(floatToFixed(fvar.maxValue), out.data(), head);
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head = writeU16(0, out.data(), head); // flags
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head = writeU16(0, out.data(), head); // axis name ID
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}
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return out;
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}
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TEST(FontUtilsTest, analyzeAxes_tagCount) {
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std::vector<uint8_t> fvarTable = buildFvarTable({
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Fvar(MakeTag('w', 'd', 't', 'h'), 0.0f, 1.0f, 2.0f),
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Fvar(MakeTag('w', 'g', 'h', 't'), 0.0f, 1.0f, 2.0f),
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});
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std::unordered_set<uint32_t> axes;
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ASSERT_TRUE(analyzeAxes(fvarTable.data(), fvarTable.size(), &axes));
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ASSERT_EQ(2u, axes.size());
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EXPECT_EQ(1u, axes.count(MakeTag('w', 'd', 't', 'h')));
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EXPECT_EQ(1u, axes.count(MakeTag('w', 'g', 'h', 't')));
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EXPECT_EQ(0u, axes.count(MakeTag('s', 'l', 'n', 't')));
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}
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TEST(FontUtilsTest, analyzeAxes_emptyBuffer) {
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std::vector<uint8_t> fvarTable;
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std::unordered_set<uint32_t> axes;
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ASSERT_FALSE(analyzeAxes(fvarTable.data(), fvarTable.size(), &axes));
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}
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TEST(FontUtilsTest, analyzeAxes_invalidTableSize) {
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std::vector<uint8_t> fvarTable = buildFvarTable({
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Fvar(MakeTag('w', 'd', 't', 'h'), 0.0f, 1.0f, 2.0f),
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Fvar(MakeTag('w', 'g', 'h', 't'), 0.0f, 1.0f, 2.0f),
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});
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fvarTable.resize(1000);
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writeU16(50, fvarTable.data(), 8); // Set axisCount = 50
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std::unordered_set<uint32_t> axes;
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ASSERT_FALSE(analyzeAxes(fvarTable.data(), fvarTable.size(), &axes));
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}
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} // namespace
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} // namespace minikin
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