gecko-dev/gfx/thebes/gfxFT2FontBase.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_FT2FONTBASE_H
#define GFX_FT2FONTBASE_H
#include "cairo.h"
#include "gfxContext.h"
#include "gfxFont.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/UnscaledFontFreeType.h"
#include "nsDataHashtable.h"
#include "nsHashKeys.h"
class gfxFT2FontBase : public gfxFont {
public:
gfxFT2FontBase(
const RefPtr<mozilla::gfx::UnscaledFontFreeType>& aUnscaledFont,
cairo_scaled_font_t* aScaledFont, gfxFontEntry* aFontEntry,
const gfxFontStyle* aFontStyle);
virtual ~gfxFT2FontBase();
uint32_t GetGlyph(uint32_t aCharCode);
void GetGlyphExtents(uint32_t aGlyph, cairo_text_extents_t* aExtents);
virtual uint32_t GetSpaceGlyph() override;
virtual bool ProvidesGetGlyph() const override { return true; }
virtual uint32_t GetGlyph(uint32_t unicode,
uint32_t variation_selector) override;
virtual bool ProvidesGlyphWidths() const override { return true; }
virtual int32_t GetGlyphWidth(uint16_t aGID) override;
virtual bool SetupCairoFont(DrawTarget* aDrawTarget) override;
virtual FontType GetType() const override { return FONT_TYPE_FT2; }
static void SetupVarCoords(FT_MM_Var* aMMVar,
const nsTArray<gfxFontVariation>& aVariations,
nsTArray<FT_Fixed>* aCoords);
private:
uint32_t GetCharExtents(char aChar, cairo_text_extents_t* aExtents);
uint32_t GetCharWidth(char aChar, gfxFloat* aWidth);
// Get advance of a single glyph from FreeType, and return true;
// or return false if we should fall back to getting the glyph
// extents from cairo instead.
bool GetFTGlyphAdvance(uint16_t aGID, int32_t* aWidth);
void InitMetrics();
protected:
virtual const Metrics& GetHorizontalMetrics() override;
uint32_t mSpaceGlyph;
Metrics mMetrics;
bool mEmbolden;
// For variation/multiple-master fonts, this will be an array of the values
// for each axis, as specified by mStyle.variationSettings (or the font's
// default for axes not present in variationSettings). Values here are in
// freetype's 16.16 fixed-point format, and clamped to the valid min/max
// range reported by the face.
nsTArray<FT_Fixed> mCoords;
mozilla::UniquePtr<nsDataHashtable<nsUint32HashKey, int32_t>> mGlyphWidths;
};
#endif /* GFX_FT2FONTBASE_H */