зеркало из https://github.com/mozilla/gecko-dev.git
127 строки
5.2 KiB
C++
127 строки
5.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is thebes gfx code.
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*
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* The Initial Developer of the Original Code is Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2009-2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jonathan Kew <jfkthame@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_HARFBUZZSHAPER_H
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#define GFX_HARFBUZZSHAPER_H
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#include "gfxTypes.h"
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#include "gfxFont.h"
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#include "nsDataHashtable.h"
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#include "nsPoint.h"
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#include "harfbuzz/hb.h"
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class gfxHarfBuzzShaper : public gfxFontShaper {
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public:
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gfxHarfBuzzShaper(gfxFont *aFont);
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virtual ~gfxHarfBuzzShaper();
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virtual PRBool InitTextRun(gfxContext *aContext,
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gfxTextRun *aTextRun,
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const PRUnichar *aString,
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PRUint32 aRunStart,
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PRUint32 aRunLength,
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PRInt32 aRunScript);
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// get a given font table in harfbuzz blob form
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hb_blob_t * GetFontTable(hb_tag_t aTag) const;
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// map unicode character to glyph ID
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hb_codepoint_t GetGlyph(hb_codepoint_t unicode,
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hb_codepoint_t variation_selector) const;
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// get harfbuzz glyph advance, in font design units
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void GetGlyphAdvance(gfxContext *aContext,
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hb_codepoint_t glyph,
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hb_position_t *x_advance,
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hb_position_t *y_advance) const;
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hb_position_t GetKerning(PRUint16 aFirstGlyph,
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PRUint16 aSecondGlyph) const;
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protected:
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// extract glyphs from HarfBuzz buffer and store into the gfxTextRun
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nsresult SetGlyphsFromRun(gfxContext *aContext,
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gfxTextRun *aTextRun,
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hb_buffer_t *aBuffer,
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PRUint32 aTextRunOffset,
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PRUint32 aRunLength);
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// retrieve glyph positions, applying advance adjustments and attachments
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// returns results in appUnits
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nscoord GetGlyphPositions(gfxContext *aContext,
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hb_buffer_t *aBuffer,
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nsTArray<nsPoint>& aPositions,
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PRUint32 aAppUnitsPerDevUnit);
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// harfbuzz face object, created on first use (caches font tables)
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hb_face_t *mHBFace;
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// Following table references etc are declared "mutable" because the
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// harfbuzz callback functions take a const ptr to the shaper, but
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// wish to cache tables here to avoid repeatedly looking them up
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// in the font.
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// Old-style TrueType kern table, if we're not doing GPOS kerning
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mutable hb_blob_t *mKernTable;
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// Cached copy of the hmtx table and numLongMetrics field from hhea,
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// for use when looking up glyph metrics; initialized to 0 by the
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// constructor so we can tell it hasn't been set yet.
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// This is a signed value so that we can use -1 to indicate
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// an error (if the hhea table was not available).
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mutable hb_blob_t *mHmtxTable;
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mutable PRInt32 mNumLongMetrics;
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// Cached pointer to cmap subtable to be used for char-to-glyph mapping.
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// This comes from GetFontTablePtr; if it is non-null, our destructor
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// must call ReleaseFontTablePtr to avoid permanently caching the table.
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mutable hb_blob_t *mCmapTable;
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mutable PRInt32 mCmapFormat;
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mutable PRUint32 mSubtableOffset;
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mutable PRUint32 mUVSTableOffset;
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// Whether the font implements GetGlyph, or we should read tables
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// directly
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PRPackedBool mUseFontGetGlyph;
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// Whether the font implements GetGlyphWidth, or we should read tables
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// directly to get ideal widths
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PRPackedBool mUseFontGlyphWidths;
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};
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#endif /* GFX_HARFBUZZSHAPER_H */
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