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Diffstat (limited to 'vcl/source/gdi/scrptrun.cxx')
| -rw-r--r-- | vcl/source/gdi/scrptrun.cxx | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/vcl/source/gdi/scrptrun.cxx b/vcl/source/gdi/scrptrun.cxx new file mode 100644 index 000000000..b18816cac --- /dev/null +++ b/vcl/source/gdi/scrptrun.cxx @@ -0,0 +1,247 @@ +/* + ******************************************************************************* + * + * Copyright (c) 1995-2013 International Business Machines Corporation and others + * + * All rights reserved. + * + * 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, and/or sell copies of the + * Software, and to permit persons to whom the Software is furnished to do so, + * provided that the above copyright notice(s) and this permission notice appear + * in all copies of the Software and that both the above copyright notice(s) and + * this permission notice appear in supporting documentation. + * + * 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 OF THIRD PARTY RIGHTS. IN + * NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE BE + * LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY + * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Except as contained in this notice, the name of a copyright holder shall not be + * used in advertising or otherwise to promote the sale, use or other dealings in + * this Software without prior written authorization of the copyright holder. + * + ******************************************************************************* + * file name: scrptrun.cpp + * + * created on: 10/17/2001 + * created by: Eric R. Mader + */ +/** + * This file is largely copied from the ICU project, + * under folder source/extra/scrptrun/scrptrun.cpp + */ +#include <unicode/utypes.h> +#include <unicode/uscript.h> + +#include <scrptrun.h> +#include <algorithm> + +namespace { + +struct PairIndices +{ + int8_t ma00[0xff]; + int8_t ma20[0x7f]; + int8_t ma30[0x7f]; + + PairIndices() + { + std::fill_n(ma00, 0xff, -1); + std::fill_n(ma20, 0x7f, -1); + std::fill_n(ma30, 0x7f, -1); + + // characters in the range 0x0000 - 0x007e (inclusive) + // ascii paired punctuation + ma00[0x28] = 0; + ma00[0x29] = 1; + ma00[0x3c] = 2; + ma00[0x3e] = 3; + ma00[0x5b] = 4; + ma00[0x5d] = 5; + ma00[0x7b] = 6; + ma00[0x7d] = 7; + // guillemets + ma00[0xab] = 8; + ma00[0xbb] = 9; + + // characters in the range 0x2000 - 0x207e (inclusive) + // general punctuation + ma20[0x18] = 10; + ma20[0x19] = 11; + ma20[0x1c] = 12; + ma20[0x1d] = 13; + ma20[0x39] = 14; + ma20[0x3a] = 15; + + // characters in the range 0x3000 - 0x307e (inclusive) + // chinese paired punctuation + ma30[0x08] = 16; + ma30[0x09] = 17; + ma30[0x0a] = 18; + ma30[0x0b] = 19; + ma30[0x0c] = 20; + ma30[0x0d] = 21; + ma30[0x0e] = 22; + ma30[0x0f] = 23; + ma30[0x10] = 24; + ma30[0x11] = 25; + ma30[0x14] = 26; + ma30[0x15] = 27; + ma30[0x16] = 28; + ma30[0x17] = 29; + ma30[0x18] = 30; + ma30[0x19] = 31; + ma30[0x1a] = 32; + ma30[0x1b] = 33; + } + + int32_t getPairIndex(UChar32 ch) const + { + if (ch < 0xff) + return ma00[ch]; + if (ch >= 0x2000 && ch < 0x207f) + return ma20[ch - 0x2000]; + if (ch >= 0x3000 && ch < 0x307f) + return ma30[ch - 0x3000]; + return -1; + } + +}; + +// There are three Unicode script codes for Japanese text, but only one +// OpenType script tag, so we want to keep them in one run as splitting is +// pointless for the purpose of OpenType shaping. +UScriptCode getScript(UChar32 ch, UErrorCode* status) +{ + UScriptCode script = uscript_getScript(ch, status); + if (U_FAILURE(*status)) + return script; + if (script == USCRIPT_KATAKANA || script == USCRIPT_KATAKANA_OR_HIRAGANA) + return USCRIPT_HIRAGANA; + return script; +} + +} + +static const PairIndices gPairIndices; + + +namespace vcl { + +const char ScriptRun::fgClassID=0; + +static bool sameScript(int32_t scriptOne, int32_t scriptTwo) +{ + return scriptOne <= USCRIPT_INHERITED || scriptTwo <= USCRIPT_INHERITED || scriptOne == scriptTwo; +} + +UBool ScriptRun::next() +{ + int32_t startSP = parenSP; // used to find the first new open character + UErrorCode error = U_ZERO_ERROR; + + // if we've fallen off the end of the text, we're done + if (scriptEnd >= charLimit) { + return false; + } + + scriptCode = USCRIPT_COMMON; + + for (scriptStart = scriptEnd; scriptEnd < charLimit; scriptEnd += 1) { + UChar high = charArray[scriptEnd]; + UChar32 ch = high; + + // if the character is a high surrogate and it's not the last one + // in the text, see if it's followed by a low surrogate + if (high >= 0xD800 && high <= 0xDBFF && scriptEnd < charLimit - 1) + { + UChar low = charArray[scriptEnd + 1]; + + // if it is followed by a low surrogate, + // consume it and form the full character + if (low >= 0xDC00 && low <= 0xDFFF) { + ch = (high - 0xD800) * 0x0400 + low - 0xDC00 + 0x10000; + scriptEnd += 1; + } + } + + UScriptCode sc = getScript(ch, &error); + int32_t pairIndex = gPairIndices.getPairIndex(ch); + + // Paired character handling: + + // if it's an open character, push it onto the stack. + // if it's a close character, find the matching open on the + // stack, and use that script code. Any non-matching open + // characters above it on the stack will be popped. + if (pairIndex >= 0) { + if ((pairIndex & 1) == 0) { + ++parenSP; + int32_t nVecSize = parenStack.size(); + if (parenSP == nVecSize) + parenStack.resize(nVecSize + 128); + parenStack[parenSP].pairIndex = pairIndex; + parenStack[parenSP].scriptCode = scriptCode; + } else if (parenSP >= 0) { + int32_t pi = pairIndex & ~1; + + while (parenSP >= 0 && parenStack[parenSP].pairIndex != pi) { + parenSP -= 1; + } + + if (parenSP < startSP) { + startSP = parenSP; + } + + if (parenSP >= 0) { + sc = parenStack[parenSP].scriptCode; + } + } + } + + if (sameScript(scriptCode, sc)) { + if (scriptCode <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) { + scriptCode = sc; + + // now that we have a final script code, fix any open + // characters we pushed before we knew the script code. + while (startSP < parenSP) { + parenStack[++startSP].scriptCode = scriptCode; + } + } + + // if this character is a close paired character, + // pop it from the stack + if (pairIndex >= 0 && (pairIndex & 1) != 0 && parenSP >= 0) { + parenSP -= 1; + /* decrement startSP only if it is >= 0, + decrementing it unnecessarily will lead to memory corruption + while processing the above while block. + e.g. startSP = -4 , parenSP = -1 + */ + if (startSP >= 0) { + startSP -= 1; + } + } + } else { + // if the run broke on a surrogate pair, + // end it before the high surrogate + if (ch >= 0x10000) { + scriptEnd -= 1; + } + + break; + } + } + + return true; +} + +} |