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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "Minikin"
#include "ScriptUtils.h"
#include <unicode/ubidi.h>
#include <unicode/uscript.h>
#include <unicode/utf16.h>
#include <unicode/utypes.h>
#include <algorithm>
#include "MinikinInternal.h"
#include "minikin/Emoji.h"
namespace minikin {
static hb_codepoint_t decodeUtf16(U16StringPiece text, Range range, uint32_t pos) {
uint32_t result;
U16_NEXT(text.data(), pos, range.getEnd(), result);
if (U_IS_SURROGATE(result)) { // isolated surrogate
result = CHAR_REPLACEMENT_CHARACTER;
}
return static_cast<hb_codepoint_t>(result);
}
static UScriptCode getICUScript(uint32_t cp) {
UErrorCode status = U_ZERO_ERROR;
UScriptCode scriptCode = uscript_getScript(cp, &status);
if (U_FAILURE(status)) [[unlikely]] {
return USCRIPT_INVALID_CODE;
}
return scriptCode;
}
static hb_script_t getHbScript(uint32_t cp) {
hb_unicode_funcs_t* unicode_func = hb_unicode_funcs_get_default();
return hb_unicode_script(unicode_func, cp);
}
// static
std::pair<uint32_t, hb_script_t> ScriptText::getScriptRun(U16StringPiece text, Range range,
uint32_t pos) {
if (!range.contains(pos)) {
return std::make_pair(range.getEnd(), HB_SCRIPT_UNKNOWN);
}
uint32_t cp = decodeUtf16(text, range, pos);
UScriptCode current_script = getICUScript(cp);
hb_script_t current_hb_script = getHbScript(cp);
uint32_t i;
for (i = pos + U16_LENGTH(cp); i < range.getEnd(); i += U16_LENGTH(cp)) {
cp = decodeUtf16(text, range, i);
UScriptCode next_script = getICUScript(cp);
if (current_script != next_script) {
if (current_script == USCRIPT_INHERITED || current_script == USCRIPT_COMMON) {
current_script = next_script;
current_hb_script = getHbScript(cp);
} else if (next_script == USCRIPT_INHERITED || next_script == USCRIPT_COMMON) {
continue;
} else {
break;
}
}
}
if (current_script == USCRIPT_INHERITED) {
return std::make_pair(i, HB_SCRIPT_COMMON);
} else {
return std::make_pair(i, current_hb_script);
}
}
} // namespace minikin
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