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comparison: layout/generic/nsTextRunTransformations.h

layout/generic/nsTextRunTransformations.h

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TOR_BUG_9701
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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 * This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #ifndef NSTEXTRUNTRANSFORMATIONS_H_
7 #define NSTEXTRUNTRANSFORMATIONS_H_
8
9 #include "mozilla/Attributes.h"
10 #include "mozilla/MemoryReporting.h"
11 #include "gfxFont.h"
12
13 class nsTransformedTextRun;
14 class nsStyleContext;
15
16 class nsTransformingTextRunFactory {
17 public:
18 virtual ~nsTransformingTextRunFactory() {}
19
20 // Default 8-bit path just transforms to Unicode and takes that path
21 nsTransformedTextRun* MakeTextRun(const uint8_t* aString, uint32_t aLength,
22 const gfxFontGroup::Parameters* aParams,
23 gfxFontGroup* aFontGroup, uint32_t aFlags,
24 nsStyleContext** aStyles, bool aOwnsFactory = true);
25 nsTransformedTextRun* MakeTextRun(const char16_t* aString, uint32_t aLength,
26 const gfxFontGroup::Parameters* aParams,
27 gfxFontGroup* aFontGroup, uint32_t aFlags,
28 nsStyleContext** aStyles, bool aOwnsFactory = true);
29
30 virtual void RebuildTextRun(nsTransformedTextRun* aTextRun, gfxContext* aRefContext) = 0;
31 };
32
33 /**
34 * Builds textruns that render their text using a font-variant (i.e.,
35 * smallcaps).
36 */
37 class nsFontVariantTextRunFactory : public nsTransformingTextRunFactory {
38 public:
39 virtual void RebuildTextRun(nsTransformedTextRun* aTextRun, gfxContext* aRefContext) MOZ_OVERRIDE;
40 };
41
42 /**
43 * Builds textruns that transform the text in some way (e.g., capitalize)
44 * and then render the text using some other textrun implementation.
45 */
46 class nsCaseTransformTextRunFactory : public nsTransformingTextRunFactory {
47 public:
48 // We could add an optimization here so that when there is no inner
49 // factory, no title-case conversion, and no upper-casing of SZLIG, we override
50 // MakeTextRun (after making it virtual in the superclass) and have it
51 // just convert the string to uppercase or lowercase and create the textrun
52 // via the fontgroup.
53
54 // Takes ownership of aInnerTransformTextRunFactory
55 nsCaseTransformTextRunFactory(nsTransformingTextRunFactory* aInnerTransformingTextRunFactory,
56 bool aAllUppercase = false)
57 : mInnerTransformingTextRunFactory(aInnerTransformingTextRunFactory),
58 mAllUppercase(aAllUppercase) {}
59
60 virtual void RebuildTextRun(nsTransformedTextRun* aTextRun, gfxContext* aRefContext) MOZ_OVERRIDE;
61
62 protected:
63 nsAutoPtr<nsTransformingTextRunFactory> mInnerTransformingTextRunFactory;
64 bool mAllUppercase;
65 };
66
67 /**
68 * So that we can reshape as necessary, we store enough information
69 * to fully rebuild the textrun contents.
70 */
71 class nsTransformedTextRun : public gfxTextRun {
72 public:
73 static nsTransformedTextRun *Create(const gfxTextRunFactory::Parameters* aParams,
74 nsTransformingTextRunFactory* aFactory,
75 gfxFontGroup* aFontGroup,
76 const char16_t* aString, uint32_t aLength,
77 const uint32_t aFlags, nsStyleContext** aStyles,
78 bool aOwnsFactory);
79
80 ~nsTransformedTextRun() {
81 if (mOwnsFactory) {
82 delete mFactory;
83 }
84 }
85
86 void SetCapitalization(uint32_t aStart, uint32_t aLength,
87 bool* aCapitalization,
88 gfxContext* aRefContext);
89 virtual bool SetPotentialLineBreaks(uint32_t aStart, uint32_t aLength,
90 uint8_t* aBreakBefore,
91 gfxContext* aRefContext);
92 /**
93 * Called after SetCapitalization and SetPotentialLineBreaks
94 * are done and before we request any data from the textrun. Also always
95 * called after a Create.
96 */
97 void FinishSettingProperties(gfxContext* aRefContext)
98 {
99 if (mNeedsRebuild) {
100 mNeedsRebuild = false;
101 mFactory->RebuildTextRun(this, aRefContext);
102 }
103 }
104
105 // override the gfxTextRun impls to account for additional members here
106 virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) MOZ_MUST_OVERRIDE;
107 virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) MOZ_MUST_OVERRIDE;
108
109 nsTransformingTextRunFactory *mFactory;
110 nsTArray<nsRefPtr<nsStyleContext> > mStyles;
111 nsTArray<bool> mCapitalize;
112 nsString mString;
113 bool mOwnsFactory;
114 bool mNeedsRebuild;
115
116 private:
117 nsTransformedTextRun(const gfxTextRunFactory::Parameters* aParams,
118 nsTransformingTextRunFactory* aFactory,
119 gfxFontGroup* aFontGroup,
120 const char16_t* aString, uint32_t aLength,
121 const uint32_t aFlags, nsStyleContext** aStyles,
122 bool aOwnsFactory)
123 : gfxTextRun(aParams, aLength, aFontGroup, aFlags),
124 mFactory(aFactory), mString(aString, aLength),
125 mOwnsFactory(aOwnsFactory), mNeedsRebuild(true)
126 {
127 mCharacterGlyphs = reinterpret_cast<CompressedGlyph*>(this + 1);
128
129 uint32_t i;
130 for (i = 0; i < aLength; ++i) {
131 mStyles.AppendElement(aStyles[i]);
132 }
133 }
134 };
135
136 /**
137 * Copy a given textrun, but merge certain characters into a single logical
138 * character. Glyphs for a character are added to the glyph list for the previous
139 * character and then the merged character is eliminated. Visually the results
140 * are identical.
141 *
142 * This is used for text-transform:uppercase when we encounter a SZLIG,
143 * whose uppercase form is "SS", or other ligature or precomposed form
144 * that expands to multiple codepoints during case transformation,
145 * and for Greek text when combining diacritics have been deleted.
146 *
147 * This function is unable to merge characters when they occur in different
148 * glyph runs. This only happens in tricky edge cases where a character was
149 * decomposed by case-mapping (e.g. there's no precomposed uppercase version
150 * of an accented lowercase letter), and then font-matching caused the
151 * diacritics to be assigned to a different font than the base character.
152 * In this situation, the diacritic(s) get discarded, which is less than
153 * ideal, but they probably weren't going to render very well anyway.
154 * Bug 543200 will improve this by making font-matching operate on entire
155 * clusters instead of individual codepoints.
156 *
157 * For simplicity, this produces a textrun containing all DetailedGlyphs,
158 * no simple glyphs. So don't call it unless you really have merging to do.
159 *
160 * @param aCharsToMerge when aCharsToMerge[i] is true, this character in aSrc
161 * is merged into the previous character
162 *
163 * @param aDeletedChars when aDeletedChars[i] is true, the character at this
164 * position in aDest was deleted (has no corresponding char in aSrc)
165 */
166 void
167 MergeCharactersInTextRun(gfxTextRun* aDest, gfxTextRun* aSrc,
168 const bool* aCharsToMerge, const bool* aDeletedChars);
169
170 gfxTextRunFactory::Parameters
171 GetParametersForInner(nsTransformedTextRun* aTextRun, uint32_t* aFlags,
172 gfxContext* aRefContext);
173
174
175 #endif /*NSTEXTRUNTRANSFORMATIONS_H_*/

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