/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-

 * 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(DrawTarget& aDrawTarget,

                                  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 */