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https://gitlab.winehq.org/wine/wine-gecko.git
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a106503dbf
Backed out changeset 21fee1261f2e (bug 407059) Backed out changeset c940a2d399c4 (bug 407059) Backed out changeset 77593dd1b044 (bug 407059) Backed out changeset cfcbc731d4db (bug 407059) Backed out changeset d8244f3ecdcb (bug 407059)
107 lines
4.0 KiB
C++
107 lines
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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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#ifndef GFX_HARFBUZZSHAPER_H
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#define GFX_HARFBUZZSHAPER_H
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#include "gfxFont.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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/*
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* For HarfBuzz font callback functions, font_data is a ptr to a
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* FontCallbackData struct
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*/
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struct FontCallbackData {
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gfxHarfBuzzShaper *mShaper;
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gfxContext *mContext;
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};
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virtual bool ShapeText(gfxContext *aContext,
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const char16_t *aText,
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uint32_t aOffset,
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uint32_t aLength,
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int32_t aScript,
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gfxShapedText *aShapedText);
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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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hb_position_t GetGlyphHAdvance(gfxContext *aContext,
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hb_codepoint_t glyph) const;
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hb_position_t GetHKerning(uint16_t aFirstGlyph,
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uint16_t aSecondGlyph) const;
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protected:
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nsresult SetGlyphsFromRun(gfxContext *aContext,
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gfxShapedText *aShapedText,
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uint32_t aOffset,
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uint32_t aLength,
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const char16_t *aText,
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hb_buffer_t *aBuffer);
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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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uint32_t aAppUnitsPerDevUnit);
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// harfbuzz face object: we acquire a reference from the font entry
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// on shaper creation, and release it in our destructor
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hb_face_t *mHBFace;
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// size-specific font object, owned by the gfxHarfBuzzShaper
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hb_font_t *mHBFont;
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FontCallbackData mCallbackData;
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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 int32_t 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 int32_t mCmapFormat;
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mutable uint32_t mSubtableOffset;
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mutable uint32_t mUVSTableOffset;
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// Whether the font implements GetGlyph, or we should read tables
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// directly
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bool 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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bool mUseFontGlyphWidths;
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bool mInitialized;
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};
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#endif /* GFX_HARFBUZZSHAPER_H */
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