forked from mirrors/gecko-dev
801 lines
27 KiB
C++
801 lines
27 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MathMLTextRunFactory.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/BinarySearch.h"
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#include "nsStyleConsts.h"
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#include "nsTextFrameUtils.h"
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#include "nsFontMetrics.h"
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#include "nsDeviceContext.h"
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#include "nsUnicodeScriptCodes.h"
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using namespace mozilla;
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/*
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Entries for the mathvariant lookup tables. mKey represents the Unicode
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character to be transformed and is used for searching the tables.
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mReplacement represents the mapped mathvariant Unicode character.
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*/
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typedef struct
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{
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uint32_t mKey;
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uint32_t mReplacement;
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} MathVarMapping;
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/*
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Lookup tables for use with mathvariant mappings to transform a unicode
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character point to another unicode character that indicates the proper output.
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mKey represents one of two concepts.
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1. In the Latin table it represents a hole in the mathematical alphanumeric
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block, where the character that should occupy that position is located
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elsewhere.
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2. It represents an Arabic letter.
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As a replacement, 0 is reserved to indicate no mapping was found.
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*/
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static const MathVarMapping gArabicInitialMapTable[] = {
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{ 0x628, 0x1EE21 },
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{ 0x62A, 0x1EE35 },
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{ 0x62B, 0x1EE36 },
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{ 0x62C, 0x1EE22 },
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{ 0x62D, 0x1EE27 },
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{ 0x62E, 0x1EE37 },
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{ 0x633, 0x1EE2E },
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{ 0x634, 0x1EE34 },
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{ 0x635, 0x1EE31 },
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{ 0x636, 0x1EE39 },
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{ 0x639, 0x1EE2F },
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{ 0x63A, 0x1EE3B },
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{ 0x641, 0x1EE30 },
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{ 0x642, 0x1EE32 },
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{ 0x643, 0x1EE2A },
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{ 0x644, 0x1EE2B },
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{ 0x645, 0x1EE2C },
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{ 0x646, 0x1EE2D },
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{ 0x647, 0x1EE24 },
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{ 0x64A, 0x1EE29 }
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};
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static const MathVarMapping gArabicTailedMapTable[] = {
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{ 0x62C, 0x1EE42 },
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{ 0x62D, 0x1EE47 },
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{ 0x62E, 0x1EE57 },
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{ 0x633, 0x1EE4E },
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{ 0x634, 0x1EE54 },
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{ 0x635, 0x1EE51 },
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{ 0x636, 0x1EE59 },
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{ 0x639, 0x1EE4F },
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{ 0x63A, 0x1EE5B },
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{ 0x642, 0x1EE52 },
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{ 0x644, 0x1EE4B },
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{ 0x646, 0x1EE4D },
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{ 0x64A, 0x1EE49 },
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{ 0x66F, 0x1EE5F },
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{ 0x6BA, 0x1EE5D }
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};
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static const MathVarMapping gArabicStretchedMapTable[] = {
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{ 0x628, 0x1EE61 },
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{ 0x62A, 0x1EE75 },
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{ 0x62B, 0x1EE76 },
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{ 0x62C, 0x1EE62 },
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{ 0x62D, 0x1EE67 },
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{ 0x62E, 0x1EE77 },
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{ 0x633, 0x1EE6E },
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{ 0x634, 0x1EE74 },
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{ 0x635, 0x1EE71 },
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{ 0x636, 0x1EE79 },
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{ 0x637, 0x1EE68 },
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{ 0x638, 0x1EE7A },
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{ 0x639, 0x1EE6F },
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{ 0x63A, 0x1EE7B },
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{ 0x641, 0x1EE70 },
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{ 0x642, 0x1EE72 },
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{ 0x643, 0x1EE6A },
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{ 0x645, 0x1EE6C },
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{ 0x646, 0x1EE6D },
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{ 0x647, 0x1EE64 },
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{ 0x64A, 0x1EE69 },
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{ 0x66E, 0x1EE7C },
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{ 0x6A1, 0x1EE7E }
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};
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static const MathVarMapping gArabicLoopedMapTable[] = {
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{ 0x627, 0x1EE80 },
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{ 0x628, 0x1EE81 },
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{ 0x62A, 0x1EE95 },
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{ 0x62B, 0x1EE96 },
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{ 0x62C, 0x1EE82 },
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{ 0x62D, 0x1EE87 },
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{ 0x62E, 0x1EE97 },
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{ 0x62F, 0x1EE83 },
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{ 0x630, 0x1EE98 },
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{ 0x631, 0x1EE93 },
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{ 0x632, 0x1EE86 },
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{ 0x633, 0x1EE8E },
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{ 0x634, 0x1EE94 },
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{ 0x635, 0x1EE91 },
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{ 0x636, 0x1EE99 },
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{ 0x637, 0x1EE88 },
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{ 0x638, 0x1EE9A },
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{ 0x639, 0x1EE8F },
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{ 0x63A, 0x1EE9B },
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{ 0x641, 0x1EE90 },
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{ 0x642, 0x1EE92 },
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{ 0x644, 0x1EE8B },
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{ 0x645, 0x1EE8C },
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{ 0x646, 0x1EE8D },
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{ 0x647, 0x1EE84 },
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{ 0x648, 0x1EE85 },
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{ 0x64A, 0x1EE89 }
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};
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static const MathVarMapping gArabicDoubleMapTable[] = {
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{ 0x628, 0x1EEA1 },
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{ 0x62A, 0x1EEB5 },
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{ 0x62B, 0x1EEB6 },
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{ 0x62C, 0x1EEA2 },
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{ 0x62D, 0x1EEA7 },
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{ 0x62E, 0x1EEB7 },
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{ 0x62F, 0x1EEA3 },
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{ 0x630, 0x1EEB8 },
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{ 0x631, 0x1EEB3 },
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{ 0x632, 0x1EEA6 },
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{ 0x633, 0x1EEAE },
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{ 0x634, 0x1EEB4 },
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{ 0x635, 0x1EEB1 },
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{ 0x636, 0x1EEB9 },
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{ 0x637, 0x1EEA8 },
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{ 0x638, 0x1EEBA },
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{ 0x639, 0x1EEAF },
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{ 0x63A, 0x1EEBB },
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{ 0x641, 0x1EEB0 },
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{ 0x642, 0x1EEB2 },
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{ 0x644, 0x1EEAB },
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{ 0x645, 0x1EEAC },
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{ 0x646, 0x1EEAD },
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{ 0x648, 0x1EEA5 },
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{ 0x64A, 0x1EEA9 }
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};
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static const MathVarMapping gLatinExceptionMapTable[] = {
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{ 0x1D455, 0x210E },
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{ 0x1D49D, 0x212C },
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{ 0x1D4A0, 0x2130 },
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{ 0x1D4A1, 0x2131 },
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{ 0x1D4A3, 0x210B },
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{ 0x1D4A4, 0x2110 },
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{ 0x1D4A7, 0x2112 },
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{ 0x1D4A8, 0x2133 },
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{ 0x1D4AD, 0x211B },
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{ 0x1D4BA, 0x212F },
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{ 0x1D4BC, 0x210A },
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{ 0x1D4C4, 0x2134 },
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{ 0x1D506, 0x212D },
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{ 0x1D50B, 0x210C },
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{ 0x1D50C, 0x2111 },
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{ 0x1D515, 0x211C },
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{ 0x1D51D, 0x2128 },
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{ 0x1D53A, 0x2102 },
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{ 0x1D53F, 0x210D },
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{ 0x1D545, 0x2115 },
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{ 0x1D547, 0x2119 },
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{ 0x1D548, 0x211A },
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{ 0x1D549, 0x211D },
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{ 0x1D551, 0x2124 }
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};
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namespace {
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struct MathVarMappingWrapper
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{
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const MathVarMapping* const mTable;
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explicit MathVarMappingWrapper(const MathVarMapping* aTable) : mTable(aTable) {}
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uint32_t operator[](size_t index) const {
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return mTable[index].mKey;
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}
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};
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} // namespace
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// Finds a MathVarMapping struct with the specified key (aKey) within aTable.
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// aTable must be an array, whose length is specified by aNumElements
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static uint32_t
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MathvarMappingSearch(uint32_t aKey, const MathVarMapping* aTable, uint32_t aNumElements)
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{
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size_t index;
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if (BinarySearch(MathVarMappingWrapper(aTable), 0, aNumElements, aKey, &index)) {
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return aTable[index].mReplacement;
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}
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return 0;
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}
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#define GREEK_UPPER_THETA 0x03F4
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#define HOLE_GREEK_UPPER_THETA 0x03A2
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#define NABLA 0x2207
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#define PARTIAL_DIFFERENTIAL 0x2202
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#define GREEK_UPPER_ALPHA 0x0391
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#define GREEK_UPPER_OMEGA 0x03A9
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#define GREEK_LOWER_ALPHA 0x03B1
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#define GREEK_LOWER_OMEGA 0x03C9
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#define GREEK_LUNATE_EPSILON_SYMBOL 0x03F5
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#define GREEK_THETA_SYMBOL 0x03D1
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#define GREEK_KAPPA_SYMBOL 0x03F0
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#define GREEK_PHI_SYMBOL 0x03D5
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#define GREEK_RHO_SYMBOL 0x03F1
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#define GREEK_PI_SYMBOL 0x03D6
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#define GREEK_LETTER_DIGAMMA 0x03DC
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#define GREEK_SMALL_LETTER_DIGAMMA 0x03DD
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#define MATH_BOLD_CAPITAL_DIGAMMA 0x1D7CA
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#define MATH_BOLD_SMALL_DIGAMMA 0x1D7CB
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#define LATIN_SMALL_LETTER_DOTLESS_I 0x0131
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#define LATIN_SMALL_LETTER_DOTLESS_J 0x0237
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#define MATH_ITALIC_SMALL_DOTLESS_I 0x1D6A4
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#define MATH_ITALIC_SMALL_DOTLESS_J 0x1D6A5
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#define MATH_BOLD_UPPER_A 0x1D400
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#define MATH_ITALIC_UPPER_A 0x1D434
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#define MATH_BOLD_SMALL_A 0x1D41A
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#define MATH_BOLD_UPPER_ALPHA 0x1D6A8
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#define MATH_BOLD_SMALL_ALPHA 0x1D6C2
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#define MATH_ITALIC_UPPER_ALPHA 0x1D6E2
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#define MATH_BOLD_DIGIT_ZERO 0x1D7CE
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#define MATH_DOUBLE_STRUCK_ZERO 0x1D7D8
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#define MATH_BOLD_UPPER_THETA 0x1D6B9
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#define MATH_BOLD_NABLA 0x1D6C1
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#define MATH_BOLD_PARTIAL_DIFFERENTIAL 0x1D6DB
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#define MATH_BOLD_EPSILON_SYMBOL 0x1D6DC
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#define MATH_BOLD_THETA_SYMBOL 0x1D6DD
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#define MATH_BOLD_KAPPA_SYMBOL 0x1D6DE
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#define MATH_BOLD_PHI_SYMBOL 0x1D6DF
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#define MATH_BOLD_RHO_SYMBOL 0x1D6E0
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#define MATH_BOLD_PI_SYMBOL 0x1D6E1
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/*
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Performs the character mapping needed to implement MathML's mathvariant
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attribute. It takes a unicode character and maps it to its appropriate
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mathvariant counterpart specified by aMathVar. The mapped character is
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typically located within Unicode's mathematical blocks (0x1D***, 0x1EE**) but
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there are exceptions which this function accounts for.
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Characters without a valid mapping or valid aMathvar value are returned
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unaltered. Characters already in the mathematical blocks (or are one of the
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exceptions) are never transformed.
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Acceptable values for aMathVar are specified in layout/style/nsStyleConsts.h.
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The transformable characters can be found at:
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http://lists.w3.org/Archives/Public/www-math/2013Sep/0012.html and
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https://en.wikipedia.org/wiki/Mathematical_Alphanumeric_Symbols
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*/
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static uint32_t
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MathVariant(uint32_t aCh, uint8_t aMathVar)
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{
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uint32_t baseChar;
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enum CharacterType {
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kIsLatin,
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kIsGreekish,
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kIsNumber,
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kIsArabic,
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};
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CharacterType varType;
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int8_t multiplier;
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if (aMathVar <= NS_MATHML_MATHVARIANT_NORMAL) {
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// nothing to do here
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return aCh;
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}
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if (aMathVar > NS_MATHML_MATHVARIANT_STRETCHED) {
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NS_ASSERTION(false, "Illegal mathvariant value");
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return aCh;
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}
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// Exceptional characters with at most one possible transformation
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if (aCh == HOLE_GREEK_UPPER_THETA) {
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// Nothing at this code point is transformed
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return aCh;
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}
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if (aCh == GREEK_LETTER_DIGAMMA) {
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if (aMathVar == NS_MATHML_MATHVARIANT_BOLD) {
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return MATH_BOLD_CAPITAL_DIGAMMA;
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}
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return aCh;
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}
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if (aCh == GREEK_SMALL_LETTER_DIGAMMA) {
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if (aMathVar == NS_MATHML_MATHVARIANT_BOLD) {
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return MATH_BOLD_SMALL_DIGAMMA;
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}
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return aCh;
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}
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if (aCh == LATIN_SMALL_LETTER_DOTLESS_I) {
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if (aMathVar == NS_MATHML_MATHVARIANT_ITALIC) {
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return MATH_ITALIC_SMALL_DOTLESS_I;
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}
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return aCh;
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}
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if (aCh == LATIN_SMALL_LETTER_DOTLESS_J) {
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if (aMathVar == NS_MATHML_MATHVARIANT_ITALIC) {
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return MATH_ITALIC_SMALL_DOTLESS_J;
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}
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return aCh;
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}
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// The Unicode mathematical blocks are divided into four segments: Latin,
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// Greek, numbers and Arabic. In the case of the first three
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// baseChar represents the relative order in which the characters are
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// encoded in the Unicode mathematical block, normalised to the first
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// character of that sequence.
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//
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if ('A' <= aCh && aCh <= 'Z') {
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baseChar = aCh - 'A';
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varType = kIsLatin;
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} else if ('a' <= aCh && aCh <= 'z') {
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// Lowercase characters are placed immediately after the uppercase
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// characters in the Unicode mathematical block. The constant subtraction
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// represents the number of characters between the start of the sequence
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// (capital A) and the first lowercase letter.
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baseChar = MATH_BOLD_SMALL_A-MATH_BOLD_UPPER_A + aCh - 'a';
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varType = kIsLatin;
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} else if ('0' <= aCh && aCh <= '9') {
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baseChar = aCh - '0';
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varType = kIsNumber;
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} else if (GREEK_UPPER_ALPHA <= aCh && aCh <= GREEK_UPPER_OMEGA) {
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baseChar = aCh-GREEK_UPPER_ALPHA;
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varType = kIsGreekish;
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} else if (GREEK_LOWER_ALPHA <= aCh && aCh <= GREEK_LOWER_OMEGA) {
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// Lowercase Greek comes after uppercase Greek.
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// Note in this instance the presence of an additional character (Nabla)
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// between the end of the uppercase Greek characters and the lowercase
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// ones.
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baseChar = MATH_BOLD_SMALL_ALPHA - MATH_BOLD_UPPER_ALPHA
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+ aCh-GREEK_LOWER_ALPHA;
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varType = kIsGreekish;
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} else if (0x0600 <= aCh && aCh <= 0x06FF) {
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// Arabic characters are defined within this range
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varType = kIsArabic;
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} else {
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switch (aCh) {
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case GREEK_UPPER_THETA:
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baseChar = MATH_BOLD_UPPER_THETA-MATH_BOLD_UPPER_ALPHA;
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break;
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case NABLA:
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baseChar = MATH_BOLD_NABLA-MATH_BOLD_UPPER_ALPHA;
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break;
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case PARTIAL_DIFFERENTIAL:
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baseChar = MATH_BOLD_PARTIAL_DIFFERENTIAL - MATH_BOLD_UPPER_ALPHA;
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break;
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case GREEK_LUNATE_EPSILON_SYMBOL:
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baseChar = MATH_BOLD_EPSILON_SYMBOL - MATH_BOLD_UPPER_ALPHA;
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break;
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case GREEK_THETA_SYMBOL:
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baseChar = MATH_BOLD_THETA_SYMBOL - MATH_BOLD_UPPER_ALPHA;
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break;
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case GREEK_KAPPA_SYMBOL:
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baseChar = MATH_BOLD_KAPPA_SYMBOL - MATH_BOLD_UPPER_ALPHA;
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break;
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case GREEK_PHI_SYMBOL:
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baseChar = MATH_BOLD_PHI_SYMBOL - MATH_BOLD_UPPER_ALPHA;
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break;
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case GREEK_RHO_SYMBOL:
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baseChar = MATH_BOLD_RHO_SYMBOL - MATH_BOLD_UPPER_ALPHA;
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break;
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case GREEK_PI_SYMBOL:
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baseChar = MATH_BOLD_PI_SYMBOL - MATH_BOLD_UPPER_ALPHA;
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break;
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default:
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return aCh;
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}
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varType = kIsGreekish;
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}
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if (varType == kIsNumber) {
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switch (aMathVar) {
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// Each possible number mathvariant is encoded in a single, contiguous
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// block. For example the beginning of the double struck number range
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// follows immediately after the end of the bold number range.
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// multiplier represents the order of the sequences relative to the first
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// one.
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case NS_MATHML_MATHVARIANT_BOLD:
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multiplier = 0;
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break;
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case NS_MATHML_MATHVARIANT_DOUBLE_STRUCK:
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multiplier = 1;
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break;
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case NS_MATHML_MATHVARIANT_SANS_SERIF:
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multiplier = 2;
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break;
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case NS_MATHML_MATHVARIANT_BOLD_SANS_SERIF:
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multiplier = 3;
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break;
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case NS_MATHML_MATHVARIANT_MONOSPACE:
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multiplier = 4;
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break;
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default:
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// This mathvariant isn't defined for numbers or is otherwise normal
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return aCh;
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}
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// As the ranges are contiguous, to find the desired mathvariant range it
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// is sufficient to multiply the position within the sequence order
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// (multiplier) with the period of the sequence (which is constant for all
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// number sequences) and to add the character point of the first character
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// within the number mathvariant range.
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// To this the baseChar calculated earlier is added to obtain the final
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// code point.
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return baseChar+multiplier*(MATH_DOUBLE_STRUCK_ZERO-MATH_BOLD_DIGIT_ZERO)
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+MATH_BOLD_DIGIT_ZERO;
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} else if (varType == kIsGreekish) {
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switch (aMathVar) {
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case NS_MATHML_MATHVARIANT_BOLD:
|
|
multiplier = 0;
|
|
break;
|
|
case NS_MATHML_MATHVARIANT_ITALIC:
|
|
multiplier = 1;
|
|
break;
|
|
case NS_MATHML_MATHVARIANT_BOLD_ITALIC:
|
|
multiplier = 2;
|
|
break;
|
|
case NS_MATHML_MATHVARIANT_BOLD_SANS_SERIF:
|
|
multiplier = 3;
|
|
break;
|
|
case NS_MATHML_MATHVARIANT_SANS_SERIF_BOLD_ITALIC:
|
|
multiplier = 4;
|
|
break;
|
|
default:
|
|
// This mathvariant isn't defined for Greek or is otherwise normal
|
|
return aCh;
|
|
}
|
|
// See the kIsNumber case for an explanation of the following calculation
|
|
return baseChar + MATH_BOLD_UPPER_ALPHA +
|
|
multiplier*(MATH_ITALIC_UPPER_ALPHA - MATH_BOLD_UPPER_ALPHA);
|
|
}
|
|
|
|
uint32_t tempChar;
|
|
uint32_t newChar;
|
|
if (varType == kIsArabic) {
|
|
const MathVarMapping* mapTable;
|
|
uint32_t tableLength;
|
|
switch (aMathVar) {
|
|
/* The Arabic mathematical block is not continuous, nor does it have a
|
|
* monotonic mapping to the unencoded characters, requiring the use of a
|
|
* lookup table.
|
|
*/
|
|
case NS_MATHML_MATHVARIANT_INITIAL:
|
|
mapTable = gArabicInitialMapTable;
|
|
tableLength = ArrayLength(gArabicInitialMapTable);
|
|
break;
|
|
case NS_MATHML_MATHVARIANT_TAILED:
|
|
mapTable = gArabicTailedMapTable;
|
|
tableLength = ArrayLength(gArabicTailedMapTable);
|
|
break;
|
|
case NS_MATHML_MATHVARIANT_STRETCHED:
|
|
mapTable = gArabicStretchedMapTable;
|
|
tableLength = ArrayLength(gArabicStretchedMapTable);
|
|
break;
|
|
case NS_MATHML_MATHVARIANT_LOOPED:
|
|
mapTable = gArabicLoopedMapTable;
|
|
tableLength = ArrayLength(gArabicLoopedMapTable);
|
|
break;
|
|
case NS_MATHML_MATHVARIANT_DOUBLE_STRUCK:
|
|
mapTable = gArabicDoubleMapTable;
|
|
tableLength = ArrayLength(gArabicDoubleMapTable);
|
|
break;
|
|
default:
|
|
// No valid transformations exist
|
|
return aCh;
|
|
}
|
|
newChar = MathvarMappingSearch(aCh, mapTable, tableLength);
|
|
} else {
|
|
// Must be Latin
|
|
if (aMathVar > NS_MATHML_MATHVARIANT_MONOSPACE) {
|
|
// Latin doesn't support the Arabic mathvariants
|
|
return aCh;
|
|
}
|
|
multiplier = aMathVar - 2;
|
|
// This is possible because the values for NS_MATHML_MATHVARIANT_* are
|
|
// chosen to coincide with the order in which the encoded mathvariant
|
|
// characters are located within their unicode block (less an offset to
|
|
// avoid _NONE and _NORMAL variants)
|
|
// See the kIsNumber case for an explanation of the following calculation
|
|
tempChar = baseChar + MATH_BOLD_UPPER_A +
|
|
multiplier*(MATH_ITALIC_UPPER_A - MATH_BOLD_UPPER_A);
|
|
// There are roughly twenty characters that are located outside of the
|
|
// mathematical block, so the spaces where they ought to be are used
|
|
// as keys for a lookup table containing the correct character mappings.
|
|
newChar = MathvarMappingSearch(tempChar, gLatinExceptionMapTable,
|
|
ArrayLength(gLatinExceptionMapTable));
|
|
}
|
|
|
|
if (newChar) {
|
|
return newChar;
|
|
} else if (varType == kIsLatin) {
|
|
return tempChar;
|
|
} else {
|
|
// An Arabic character without a corresponding mapping
|
|
return aCh;
|
|
}
|
|
|
|
}
|
|
|
|
#define TT_SSTY TRUETYPE_TAG('s', 's', 't', 'y')
|
|
#define TT_DTLS TRUETYPE_TAG('d', 't', 'l', 's')
|
|
|
|
void
|
|
MathMLTextRunFactory::RebuildTextRun(nsTransformedTextRun* aTextRun,
|
|
mozilla::gfx::DrawTarget* aRefDrawTarget,
|
|
gfxMissingFontRecorder* aMFR)
|
|
{
|
|
gfxFontGroup* fontGroup = aTextRun->GetFontGroup();
|
|
|
|
nsAutoString convertedString;
|
|
AutoTArray<bool,50> charsToMergeArray;
|
|
AutoTArray<bool,50> deletedCharsArray;
|
|
AutoTArray<RefPtr<nsTransformedCharStyle>,50> styleArray;
|
|
AutoTArray<uint8_t,50> canBreakBeforeArray;
|
|
bool mergeNeeded = false;
|
|
|
|
bool singleCharMI =
|
|
aTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_SINGLE_CHAR_MI;
|
|
|
|
uint32_t length = aTextRun->GetLength();
|
|
const char16_t* str = aTextRun->mString.BeginReading();
|
|
const nsTArray<RefPtr<nsTransformedCharStyle>>& styles = aTextRun->mStyles;
|
|
nsFont font;
|
|
if (length) {
|
|
font = styles[0]->mFont;
|
|
|
|
if (mSSTYScriptLevel || (mFlags & MATH_FONT_FEATURE_DTLS)) {
|
|
bool foundSSTY = false;
|
|
bool foundDTLS = false;
|
|
// We respect ssty settings explicitly set by the user
|
|
for (uint32_t i = 0; i < font.fontFeatureSettings.Length(); i++) {
|
|
if (font.fontFeatureSettings[i].mTag == TT_SSTY) {
|
|
foundSSTY = true;
|
|
} else if (font.fontFeatureSettings[i].mTag == TT_DTLS) {
|
|
foundDTLS = true;
|
|
}
|
|
}
|
|
if (mSSTYScriptLevel && !foundSSTY) {
|
|
uint8_t sstyLevel = 0;
|
|
float scriptScaling = pow(styles[0]->mScriptSizeMultiplier,
|
|
mSSTYScriptLevel);
|
|
static_assert(NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER < 1,
|
|
"Shouldn't it make things smaller?");
|
|
/*
|
|
An SSTY level of 2 is set if the scaling factor is less than or equal
|
|
to halfway between that for a scriptlevel of 1 (0.71) and that of a
|
|
scriptlevel of 2 (0.71^2), assuming the default script size multiplier.
|
|
An SSTY level of 1 is set if the script scaling factor is less than
|
|
or equal that for a scriptlevel of 1 assuming the default script size
|
|
multiplier.
|
|
|
|
User specified values of script size multiplier will change the scaling
|
|
factor which mSSTYScriptLevel values correspond to.
|
|
|
|
In the event that the script size multiplier actually makes things
|
|
larger, no change is made.
|
|
|
|
To opt out of this change, add the following to the stylesheet:
|
|
"font-feature-settings: 'ssty' 0"
|
|
*/
|
|
if (scriptScaling <= (NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER +
|
|
(NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER *
|
|
NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER))/2) {
|
|
// Currently only the first two ssty settings are used, so two is large
|
|
// as we go
|
|
sstyLevel = 2;
|
|
} else if (scriptScaling <= NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER) {
|
|
sstyLevel = 1;
|
|
}
|
|
if (sstyLevel) {
|
|
gfxFontFeature settingSSTY;
|
|
settingSSTY.mTag = TT_SSTY;
|
|
settingSSTY.mValue = sstyLevel;
|
|
font.fontFeatureSettings.AppendElement(settingSSTY);
|
|
}
|
|
}
|
|
/*
|
|
Apply the dtls font feature setting (dotless).
|
|
This gets applied to the base frame and all descendants of the base
|
|
frame of certain <mover> and <munderover> frames.
|
|
|
|
See nsMathMLmunderoverFrame.cpp for a full description.
|
|
|
|
To opt out of this change, add the following to the stylesheet:
|
|
"font-feature-settings: 'dtls' 0"
|
|
*/
|
|
if ((mFlags & MATH_FONT_FEATURE_DTLS) && !foundDTLS) {
|
|
gfxFontFeature settingDTLS;
|
|
settingDTLS.mTag = TT_DTLS;
|
|
settingDTLS.mValue = 1;
|
|
font.fontFeatureSettings.AppendElement(settingDTLS);
|
|
}
|
|
}
|
|
}
|
|
|
|
uint8_t mathVar = NS_MATHML_MATHVARIANT_NONE;
|
|
bool doMathvariantStyling = true;
|
|
|
|
for (uint32_t i = 0; i < length; ++i) {
|
|
int extraChars = 0;
|
|
mathVar = styles[i]->mMathVariant;
|
|
|
|
if (singleCharMI && mathVar == NS_MATHML_MATHVARIANT_NONE) {
|
|
// If the user has explicitly set a non-default value for fontstyle or
|
|
// fontweight, the italic mathvariant behaviour of <mi> is disabled
|
|
// This overrides the initial values specified in fontStyle, to avoid
|
|
// inconsistencies in which attributes allow CSS changes and which do not.
|
|
if (mFlags & MATH_FONT_WEIGHT_BOLD) {
|
|
font.weight = NS_FONT_WEIGHT_BOLD;
|
|
if (mFlags & MATH_FONT_STYLING_NORMAL) {
|
|
font.style = NS_FONT_STYLE_NORMAL;
|
|
} else {
|
|
font.style = NS_FONT_STYLE_ITALIC;
|
|
}
|
|
} else if (mFlags & MATH_FONT_STYLING_NORMAL) {
|
|
font.style = NS_FONT_STYLE_NORMAL;
|
|
font.weight = NS_FONT_WEIGHT_NORMAL;
|
|
} else {
|
|
mathVar = NS_MATHML_MATHVARIANT_ITALIC;
|
|
}
|
|
}
|
|
|
|
uint32_t ch = str[i];
|
|
if (NS_IS_HIGH_SURROGATE(ch) && i < length - 1 &&
|
|
NS_IS_LOW_SURROGATE(str[i + 1])) {
|
|
ch = SURROGATE_TO_UCS4(ch, str[i + 1]);
|
|
}
|
|
uint32_t ch2 = MathVariant(ch, mathVar);
|
|
|
|
if (mathVar == NS_MATHML_MATHVARIANT_BOLD ||
|
|
mathVar == NS_MATHML_MATHVARIANT_BOLD_ITALIC ||
|
|
mathVar == NS_MATHML_MATHVARIANT_ITALIC) {
|
|
if (ch == ch2 && ch != 0x20 && ch != 0xA0) {
|
|
// Don't apply the CSS style if a character cannot be
|
|
// transformed. There is an exception for whitespace as it is both
|
|
// common and innocuous.
|
|
doMathvariantStyling = false;
|
|
}
|
|
if (ch2 != ch) {
|
|
// Bug 930504. Some platforms do not have fonts for Mathematical
|
|
// Alphanumeric Symbols. Hence we check whether the transformed
|
|
// character is actually available.
|
|
uint8_t matchType;
|
|
RefPtr<gfxFont> mathFont = fontGroup->
|
|
FindFontForChar(ch2, 0, 0, unicode::Script::COMMON, nullptr, &matchType);
|
|
if (mathFont) {
|
|
// Don't apply the CSS style if there is a math font for at least one
|
|
// of the transformed character in this text run.
|
|
doMathvariantStyling = false;
|
|
} else {
|
|
// We fallback to the original character.
|
|
ch2 = ch;
|
|
if (aMFR) {
|
|
aMFR->RecordScript(unicode::Script::MATHEMATICAL_NOTATION);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
deletedCharsArray.AppendElement(false);
|
|
charsToMergeArray.AppendElement(false);
|
|
styleArray.AppendElement(styles[i]);
|
|
canBreakBeforeArray.AppendElement(aTextRun->CanBreakLineBefore(i));
|
|
|
|
if (IS_IN_BMP(ch2)) {
|
|
convertedString.Append(ch2);
|
|
} else {
|
|
convertedString.Append(H_SURROGATE(ch2));
|
|
convertedString.Append(L_SURROGATE(ch2));
|
|
++extraChars;
|
|
if (!IS_IN_BMP(ch)) {
|
|
deletedCharsArray.AppendElement(true); // not exactly deleted, but
|
|
// the trailing surrogate is skipped
|
|
++i;
|
|
}
|
|
}
|
|
|
|
while (extraChars-- > 0) {
|
|
mergeNeeded = true;
|
|
charsToMergeArray.AppendElement(true);
|
|
styleArray.AppendElement(styles[i]);
|
|
canBreakBeforeArray.AppendElement(false);
|
|
}
|
|
}
|
|
|
|
uint32_t flags;
|
|
gfxTextRunFactory::Parameters innerParams =
|
|
GetParametersForInner(aTextRun, &flags, aRefDrawTarget);
|
|
|
|
RefPtr<nsTransformedTextRun> transformedChild;
|
|
RefPtr<gfxTextRun> cachedChild;
|
|
gfxTextRun* child;
|
|
|
|
if (mathVar == NS_MATHML_MATHVARIANT_BOLD && doMathvariantStyling) {
|
|
font.style = NS_FONT_STYLE_NORMAL;
|
|
font.weight = NS_FONT_WEIGHT_BOLD;
|
|
} else if (mathVar == NS_MATHML_MATHVARIANT_ITALIC && doMathvariantStyling) {
|
|
font.style = NS_FONT_STYLE_ITALIC;
|
|
font.weight = NS_FONT_WEIGHT_NORMAL;
|
|
} else if (mathVar == NS_MATHML_MATHVARIANT_BOLD_ITALIC &&
|
|
doMathvariantStyling) {
|
|
font.style = NS_FONT_STYLE_ITALIC;
|
|
font.weight = NS_FONT_WEIGHT_BOLD;
|
|
} else if (mathVar != NS_MATHML_MATHVARIANT_NONE) {
|
|
// Mathvariant overrides fontstyle and fontweight
|
|
// Need to check to see if mathvariant is actually applied as this function
|
|
// is used for other purposes.
|
|
font.style = NS_FONT_STYLE_NORMAL;
|
|
font.weight = NS_FONT_WEIGHT_NORMAL;
|
|
}
|
|
gfxFontGroup* newFontGroup = nullptr;
|
|
|
|
// Get the correct gfxFontGroup that corresponds to the earlier font changes.
|
|
if (length) {
|
|
font.size = NSToCoordRound(font.size * mFontInflation);
|
|
nsPresContext* pc = styles[0]->mPresContext;
|
|
nsFontMetrics::Params params;
|
|
params.language = styles[0]->mLanguage;
|
|
params.explicitLanguage = styles[0]->mExplicitLanguage;
|
|
params.userFontSet = pc->GetUserFontSet();
|
|
params.textPerf = pc->GetTextPerfMetrics();
|
|
RefPtr<nsFontMetrics> metrics =
|
|
pc->DeviceContext()->GetMetricsFor(font, params);
|
|
newFontGroup = metrics->GetThebesFontGroup();
|
|
}
|
|
|
|
if (!newFontGroup) {
|
|
// If we can't get a new font group, fall back to the old one. Rendering
|
|
// will be incorrect, but not significantly so.
|
|
newFontGroup = fontGroup;
|
|
}
|
|
|
|
if (mInnerTransformingTextRunFactory) {
|
|
transformedChild = mInnerTransformingTextRunFactory->MakeTextRun(
|
|
convertedString.BeginReading(), convertedString.Length(),
|
|
&innerParams, newFontGroup, flags, Move(styleArray), false);
|
|
child = transformedChild.get();
|
|
} else {
|
|
cachedChild = newFontGroup->MakeTextRun(
|
|
convertedString.BeginReading(), convertedString.Length(),
|
|
&innerParams, flags, aMFR);
|
|
child = cachedChild.get();
|
|
}
|
|
if (!child)
|
|
return;
|
|
|
|
typedef gfxTextRun::Range Range;
|
|
|
|
// Copy potential linebreaks into child so they're preserved
|
|
// (and also child will be shaped appropriately)
|
|
NS_ASSERTION(convertedString.Length() == canBreakBeforeArray.Length(),
|
|
"Dropped characters or break-before values somewhere!");
|
|
Range range(0, uint32_t(canBreakBeforeArray.Length()));
|
|
child->SetPotentialLineBreaks(range, canBreakBeforeArray.Elements());
|
|
if (transformedChild) {
|
|
transformedChild->FinishSettingProperties(aRefDrawTarget, aMFR);
|
|
}
|
|
|
|
if (mergeNeeded) {
|
|
// Now merge multiple characters into one multi-glyph character as required
|
|
NS_ASSERTION(charsToMergeArray.Length() == child->GetLength(),
|
|
"source length mismatch");
|
|
NS_ASSERTION(deletedCharsArray.Length() == aTextRun->GetLength(),
|
|
"destination length mismatch");
|
|
MergeCharactersInTextRun(aTextRun, child, charsToMergeArray.Elements(),
|
|
deletedCharsArray.Elements());
|
|
} else {
|
|
// No merging to do, so just copy; this produces a more optimized textrun.
|
|
// We can't steal the data because the child may be cached and stealing
|
|
// the data would break the cache.
|
|
aTextRun->ResetGlyphRuns();
|
|
aTextRun->CopyGlyphDataFrom(child, Range(child), 0);
|
|
}
|
|
}
|