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[Complex Text Layouts] Implement ICU / HarfBuzz based TextServer module.

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bruvzg 2020-08-11 12:11:28 +03:00
parent b9f441e81e
commit 200828276e
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13 changed files with 5039 additions and 7 deletions
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109
modules/text_server_adv/script_iterator.cpp Normal file
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/*************************************************************************/
/* script_iterator.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "script_iterator.h"
bool ScriptIterator::same_script(int32_t p_script_one, int32_t p_script_two) {
return p_script_one <= USCRIPT_INHERITED || p_script_two <= USCRIPT_INHERITED || p_script_one == p_script_two;
}
ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length) {
struct ParenStackEntry {
int pair_index;
UScriptCode script_code;
};
if (p_start >= p_length) {
p_start = p_length - 1;
}
if (p_start < 0) {
p_start = 0;
}
ParenStackEntry paren_stack[128];
int script_start;
int script_end = p_start;
UScriptCode script_code;
int paren_sp = -1;
int start_sp = paren_sp;
UErrorCode err = U_ZERO_ERROR;
do {
script_code = USCRIPT_COMMON;
for (script_start = script_end; script_end < p_length; script_end++) {
UChar32 ch = p_string[script_end];
UScriptCode sc = uscript_getScript(ch, &err);
if (U_FAILURE(err)) {
ERR_FAIL_MSG(u_errorName(err));
}
if (u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) != U_BPT_NONE) {
if (u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) == U_BPT_OPEN) {
paren_stack[++paren_sp].pair_index = ch;
paren_stack[paren_sp].script_code = script_code;
} else if (paren_sp >= 0) {
UChar32 paired_ch = u_getBidiPairedBracket(ch);
while (paren_sp >= 0 && paren_stack[paren_sp].pair_index != paired_ch) {
paren_sp -= 1;
}
if (paren_sp < start_sp)
start_sp = paren_sp;
if (paren_sp >= 0)
sc = paren_stack[paren_sp].script_code;
}
}
if (same_script(script_code, sc)) {
if (script_code <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) {
script_code = sc;
while (start_sp < paren_sp) {
paren_stack[++start_sp].script_code = script_code;
}
}
if ((u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) == U_BPT_CLOSE) && paren_sp >= 0) {
paren_sp -= 1;
if (start_sp >= 0) {
start_sp -= 1;
}
}
} else {
break;
}
}
ScriptRange rng;
rng.script = hb_icu_script_to_script(script_code);
rng.start = script_start;
rng.end = script_end;
script_ranges.push_back(rng);
} while (script_end < p_length);
}