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da43e7c62e
* Added Windows support for libtxt in order to build flutter_tester.exe. Relatively minor changes were needed to get libtxt building on Windows (missing/incompatiable headers, the odd syscall, path separators, etc.). Windows doesn't render text in the same way as other platforms, so some tests that checked for specific pixel offsets are disabled.
126 lines
4.0 KiB
C++
126 lines
4.0 KiB
C++
/*
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* Copyright (C) 2015 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 <log/log.h>
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#include <unicode/utf.h>
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#include <unicode/utf8.h>
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#include <cstdlib>
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#include <memory>
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#include <string>
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#include <vector>
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namespace minikin {
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// src is of the form "U+1F431 | 'h' 'i'". Position of "|" gets saved to offset
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// if non-null. Size is returned in an out parameter because gtest needs a void
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// return for ASSERT to work.
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void ParseUnicode(uint16_t* buf,
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size_t buf_size,
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const char* src,
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size_t* result_size,
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size_t* offset) {
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size_t input_ix = 0;
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size_t output_ix = 0;
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bool seen_offset = false;
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while (src[input_ix] != 0) {
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switch (src[input_ix]) {
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case '\'':
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// single ASCII char
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LOG_ALWAYS_FATAL_IF(static_cast<uint8_t>(src[input_ix]) >= 0x80);
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input_ix++;
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LOG_ALWAYS_FATAL_IF(src[input_ix] == 0);
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LOG_ALWAYS_FATAL_IF(output_ix >= buf_size);
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buf[output_ix++] = (uint16_t)src[input_ix++];
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LOG_ALWAYS_FATAL_IF(src[input_ix] != '\'');
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input_ix++;
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break;
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case 'u':
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case 'U': {
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// Unicode codepoint in hex syntax
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input_ix++;
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LOG_ALWAYS_FATAL_IF(src[input_ix] != '+');
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input_ix++;
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char* endptr = (char*)src + input_ix;
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unsigned long int codepoint = strtoul(src + input_ix, &endptr, 16);
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size_t num_hex_digits = endptr - (src + input_ix);
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// also triggers on invalid number syntax, digits = 0
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LOG_ALWAYS_FATAL_IF(num_hex_digits < 4u);
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LOG_ALWAYS_FATAL_IF(num_hex_digits > 6u);
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LOG_ALWAYS_FATAL_IF(codepoint > 0x10FFFFu);
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input_ix += num_hex_digits;
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if (U16_LENGTH(codepoint) == 1) {
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LOG_ALWAYS_FATAL_IF(output_ix + 1 > buf_size);
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buf[output_ix++] = codepoint;
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} else {
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// UTF-16 encoding
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LOG_ALWAYS_FATAL_IF(output_ix + 2 > buf_size);
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buf[output_ix++] = U16_LEAD(codepoint);
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buf[output_ix++] = U16_TRAIL(codepoint);
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}
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break;
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}
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case ' ':
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input_ix++;
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break;
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case '|':
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LOG_ALWAYS_FATAL_IF(seen_offset);
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LOG_ALWAYS_FATAL_IF(offset == nullptr);
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*offset = output_ix;
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seen_offset = true;
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input_ix++;
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break;
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default:
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LOG_ALWAYS_FATAL("Unexpected Character");
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}
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}
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LOG_ALWAYS_FATAL_IF(result_size == nullptr);
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*result_size = output_ix;
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LOG_ALWAYS_FATAL_IF(!seen_offset && offset != nullptr);
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}
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std::vector<uint16_t> parseUnicodeStringWithOffset(const std::string& in,
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size_t* offset) {
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std::unique_ptr<uint16_t[]> buffer(new uint16_t[in.size()]);
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size_t result_size = 0;
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ParseUnicode(buffer.get(), in.size(), in.c_str(), &result_size, offset);
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return std::vector<uint16_t>(buffer.get(), buffer.get() + result_size);
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}
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std::vector<uint16_t> parseUnicodeString(const std::string& in) {
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return parseUnicodeStringWithOffset(in, nullptr);
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}
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std::vector<uint16_t> utf8ToUtf16(const std::string& text) {
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std::vector<uint16_t> result;
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int32_t i = 0;
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const int32_t textLength = static_cast<int32_t>(text.size());
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uint32_t c = 0;
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while (i < textLength) {
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U8_NEXT(text.c_str(), i, textLength, c);
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if (U16_LENGTH(c) == 1) {
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result.push_back(c);
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} else {
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result.push_back(U16_LEAD(c));
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result.push_back(U16_TRAIL(c));
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}
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}
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return result;
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}
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} // namespace minikin
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