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133 lines
5.1 KiB
C++
133 lines
5.1 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 Mozilla Foundation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@mozilla.com>
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* Masayuki Nakano <masayuki@d-toybox.com>
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* Behdad Esfahbod <behdad@gnome.org>
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* Mats Palmgren <mats.palmgren@bredband.net>
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* Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
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* Takuro Ashie <ashie@clear-code.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_FT2UTILS_H
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#define GFX_FT2UTILS_H
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#include "cairo-ft.h"
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#include "gfxFT2FontBase.h"
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// Rounding and truncation functions for a FreeType fixed point number
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// (FT26Dot6) stored in a 32bit integer with high 26 bits for the integer
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// part and low 6 bits for the fractional part.
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#define FLOAT_FROM_26_6(x) ((x) / 64.0)
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#define FLOAT_FROM_16_16(x) ((x) / 65536.0)
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#define ROUND_26_6_TO_INT(x) ((x) >= 0 ? ((32 + (x)) >> 6) \
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: -((32 - (x)) >> 6))
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typedef struct FT_FaceRec_* FT_Face;
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class gfxFT2LockedFace {
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public:
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gfxFT2LockedFace(gfxFT2FontBase *aFont) :
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mGfxFont(aFont),
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mFace(cairo_ft_scaled_font_lock_face(aFont->CairoScaledFont()))
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{ }
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~gfxFT2LockedFace()
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{
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if (mFace) {
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cairo_ft_scaled_font_unlock_face(mGfxFont->CairoScaledFont());
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}
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}
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FT_Face get() { return mFace; };
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/**
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* Get the glyph id for a Unicode character representable by a single
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* glyph, or return zero if there is no such glyph. This does no caching,
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* so you probably want gfxFcFont::GetGlyph.
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*/
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PRUint32 GetGlyph(PRUint32 aCharCode);
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/**
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* Returns 0 if there is no variation selector cmap subtable.
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*/
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PRUint32 GetUVSGlyph(PRUint32 aCharCode, PRUint32 aVariantSelector);
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void GetMetrics(gfxFont::Metrics* aMetrics, PRUint32* aSpaceGlyph);
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PRBool GetFontTable(PRUint32 aTag, nsTArray<PRUint8>& aBuffer);
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// A scale factor for use in converting horizontal metrics from font units
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// to pixels.
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gfxFloat XScale()
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{
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if (NS_UNLIKELY(!mFace))
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return 0.0;
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const FT_Size_Metrics& ftMetrics = mFace->size->metrics;
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if (FT_IS_SCALABLE(mFace)) {
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// Prefer FT_Size_Metrics::x_scale to x_ppem as x_ppem does not
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// have subpixel accuracy.
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//
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// FT_Size_Metrics::x_scale is in 16.16 fixed point format. Its
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// (fractional) value is a factor that converts vertical metrics
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// from design units to units of 1/64 pixels, so that the result
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// may be interpreted as pixels in 26.6 fixed point format.
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return FLOAT_FROM_26_6(FLOAT_FROM_16_16(ftMetrics.x_scale));
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}
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// Not scalable.
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// FT_Size_Metrics doc says x_scale is "only relevant for scalable
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// font formats".
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return gfxFloat(ftMetrics.x_ppem) / gfxFloat(mFace->units_per_EM);
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}
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protected:
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/**
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* Get extents for a simple character representable by a single glyph.
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* The return value is the glyph id of that glyph or zero if no such glyph
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* exists. aExtents is only set when this returns a non-zero glyph id.
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*/
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PRUint32 GetCharExtents(char aChar, cairo_text_extents_t* aExtents);
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typedef FT_UInt (*CharVariantFunction)(FT_Face face,
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FT_ULong charcode,
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FT_ULong variantSelector);
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CharVariantFunction FindCharVariantFunction();
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nsRefPtr<gfxFT2FontBase> mGfxFont;
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FT_Face mFace;
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};
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#endif /* GFX_FT2UTILS_H */
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