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comparison: gfx/thebes/gfxHarfBuzzShaper.h
gfx/thebes/gfxHarfBuzzShaper.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:cfa996e7c024 |
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 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 GFX_HARFBUZZSHAPER_H | |
| 7 #define GFX_HARFBUZZSHAPER_H | |
| 8 | |
| 9 #include "gfxFont.h" | |
| 10 | |
| 11 #include "harfbuzz/hb.h" | |
| 12 | |
| 13 class gfxHarfBuzzShaper : public gfxFontShaper { | |
| 14 public: | |
| 15 gfxHarfBuzzShaper(gfxFont *aFont); | |
| 16 virtual ~gfxHarfBuzzShaper(); | |
| 17 | |
| 18 /* | |
| 19 * For HarfBuzz font callback functions, font_data is a ptr to a | |
| 20 * FontCallbackData struct | |
| 21 */ | |
| 22 struct FontCallbackData { | |
| 23 gfxHarfBuzzShaper *mShaper; | |
| 24 gfxContext *mContext; | |
| 25 }; | |
| 26 | |
| 27 bool Initialize(); | |
| 28 virtual bool ShapeText(gfxContext *aContext, | |
| 29 const char16_t *aText, | |
| 30 uint32_t aOffset, | |
| 31 uint32_t aLength, | |
| 32 int32_t aScript, | |
| 33 gfxShapedText *aShapedText); | |
| 34 | |
| 35 // get a given font table in harfbuzz blob form | |
| 36 hb_blob_t * GetFontTable(hb_tag_t aTag) const; | |
| 37 | |
| 38 // map unicode character to glyph ID | |
| 39 hb_codepoint_t GetGlyph(hb_codepoint_t unicode, | |
| 40 hb_codepoint_t variation_selector) const; | |
| 41 | |
| 42 // get harfbuzz glyph advance, in font design units | |
| 43 hb_position_t GetGlyphHAdvance(gfxContext *aContext, | |
| 44 hb_codepoint_t glyph) const; | |
| 45 | |
| 46 // get harfbuzz horizontal advance in 16.16 fixed point format. | |
| 47 static hb_position_t | |
| 48 HBGetGlyphHAdvance(hb_font_t *font, void *font_data, | |
| 49 hb_codepoint_t glyph, void *user_data); | |
| 50 | |
| 51 hb_position_t GetHKerning(uint16_t aFirstGlyph, | |
| 52 uint16_t aSecondGlyph) const; | |
| 53 | |
| 54 protected: | |
| 55 nsresult SetGlyphsFromRun(gfxContext *aContext, | |
| 56 gfxShapedText *aShapedText, | |
| 57 uint32_t aOffset, | |
| 58 uint32_t aLength, | |
| 59 const char16_t *aText, | |
| 60 hb_buffer_t *aBuffer); | |
| 61 | |
| 62 // retrieve glyph positions, applying advance adjustments and attachments | |
| 63 // returns results in appUnits | |
| 64 nscoord GetGlyphPositions(gfxContext *aContext, | |
| 65 hb_buffer_t *aBuffer, | |
| 66 nsTArray<nsPoint>& aPositions, | |
| 67 uint32_t aAppUnitsPerDevUnit); | |
| 68 | |
| 69 // harfbuzz face object: we acquire a reference from the font entry | |
| 70 // on shaper creation, and release it in our destructor | |
| 71 hb_face_t *mHBFace; | |
| 72 | |
| 73 // size-specific font object, owned by the gfxHarfBuzzShaper | |
| 74 hb_font_t *mHBFont; | |
| 75 | |
| 76 FontCallbackData mCallbackData; | |
| 77 | |
| 78 // Following table references etc are declared "mutable" because the | |
| 79 // harfbuzz callback functions take a const ptr to the shaper, but | |
| 80 // wish to cache tables here to avoid repeatedly looking them up | |
| 81 // in the font. | |
| 82 | |
| 83 // Old-style TrueType kern table, if we're not doing GPOS kerning | |
| 84 mutable hb_blob_t *mKernTable; | |
| 85 | |
| 86 // Cached copy of the hmtx table and numLongMetrics field from hhea, | |
| 87 // for use when looking up glyph metrics; initialized to 0 by the | |
| 88 // constructor so we can tell it hasn't been set yet. | |
| 89 // This is a signed value so that we can use -1 to indicate | |
| 90 // an error (if the hhea table was not available). | |
| 91 mutable hb_blob_t *mHmtxTable; | |
| 92 mutable int32_t mNumLongMetrics; | |
| 93 | |
| 94 // Cached pointer to cmap subtable to be used for char-to-glyph mapping. | |
| 95 // This comes from GetFontTablePtr; if it is non-null, our destructor | |
| 96 // must call ReleaseFontTablePtr to avoid permanently caching the table. | |
| 97 mutable hb_blob_t *mCmapTable; | |
| 98 mutable int32_t mCmapFormat; | |
| 99 mutable uint32_t mSubtableOffset; | |
| 100 mutable uint32_t mUVSTableOffset; | |
| 101 | |
| 102 // Whether the font implements GetGlyph, or we should read tables | |
| 103 // directly | |
| 104 bool mUseFontGetGlyph; | |
| 105 // Whether the font implements GetGlyphWidth, or we should read tables | |
| 106 // directly to get ideal widths | |
| 107 bool mUseFontGlyphWidths; | |
| 108 | |
| 109 bool mInitialized; | |
| 110 }; | |
| 111 | |
| 112 #endif /* GFX_HARFBUZZSHAPER_H */ |
