gecko-dev/gfx/thebes/gfxDWriteFontList.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
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 * Software distributed under the License is distributed on an "AS IS" basis,
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Foundation code.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Bas Schouten <bschouten@mozilla.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#ifndef GFX_DWRITEFONTLIST_H
#define GFX_DWRITEFONTLIST_H

#include "gfxDWriteCommon.h"

#include "gfxFont.h"
#include "gfxUserFontSet.h"
#include "cairo-win32.h"

#include "gfxPlatformFontList.h"


/**
 * gfxDWriteFontFamily is a class that describes one of the fonts on the
 * users system.  It holds each gfxDWriteFontEntry (maps more directly to
 * a font face) which holds font type, charset info and character map info.
 */
class gfxDWriteFontEntry;

/**
 * \brief Class representing directwrite font family.
 */
class gfxDWriteFontFamily : public gfxFontFamily
{
public:
    /**
     * Constructs a new DWriteFont Family.
     *
     * \param aName Name identifying the family
     * \param aFamily IDWriteFontFamily object representing the directwrite
     * family object.
     */
    gfxDWriteFontFamily(const nsAString& aName, 
                               IDWriteFontFamily *aFamily)
      : gfxFontFamily(aName), mDWFamily(aFamily) {}
    virtual ~gfxDWriteFontFamily();
    
    virtual void FindStyleVariations();

    virtual void LocalizedName(nsAString& aLocalizedName); 
protected:
    /** This font family's directwrite fontfamily object */
    nsRefPtr<IDWriteFontFamily> mDWFamily;
};

/**
 * \brief Class representing DirectWrite FontEntry (a unique font style/family)
 */
class gfxDWriteFontEntry : public gfxFontEntry
{
public:
    /**
     * Constructs a font entry.
     *
     * \param aFaceName The name of the corresponding font face.
     * \param aFont DirectWrite font object
     */
    gfxDWriteFontEntry(const nsAString& aFaceName,
                              IDWriteFont *aFont) 
      : gfxFontEntry(aFaceName), mFont(aFont), mFontFile(nsnull)
    {
        mItalic = (aFont->GetStyle() == DWRITE_FONT_STYLE_ITALIC ||
                   aFont->GetStyle() == DWRITE_FONT_STYLE_OBLIQUE);
        mStretch = FontStretchFromDWriteStretch(aFont->GetStretch());
        PRUint16 weight = PR_ROUNDUP(aFont->GetWeight() - 50, 100);

        weight = NS_MAX<PRUint16>(100, weight);
        weight = NS_MIN<PRUint16>(900, weight);

        mWeight = weight;
    }

    /**
     * Constructs a font entry using a font. But with custom font values.
     * This is used for creating correct font entries for @font-face with local
     * font source.
     *
     * \param aFaceName The name of the corresponding font face.
     * \param aFont DirectWrite font object
     * \param aWeight Weight of the font
     * \param aStretch Stretch of the font
     * \param aItalic True if italic
     */
    gfxDWriteFontEntry(const nsAString& aFaceName,
                              IDWriteFont *aFont,
                              PRUint16 aWeight,
                              PRInt16 aStretch,
                              PRBool aItalic)
      : gfxFontEntry(aFaceName), mFont(aFont), mFontFile(nsnull)
    {
        mWeight = aWeight;
        mStretch = aStretch;
        mItalic = aItalic;
        mIsUserFont = PR_TRUE;
        mIsLocalUserFont = PR_TRUE;
    }

    /**
     * Constructs a font entry using a font file.
     *
     * \param aFaceName The name of the corresponding font face.
     * \param aFontFile DirectWrite fontfile object
     * \param aWeight Weight of the font
     * \param aStretch Stretch of the font
     * \param aItalic True if italic
     */
    gfxDWriteFontEntry(const nsAString& aFaceName,
                              IDWriteFontFile *aFontFile,
                              PRUint16 aWeight,
                              PRInt16 aStretch,
                              PRBool aItalic)
      : gfxFontEntry(aFaceName), mFont(nsnull), mFontFile(aFontFile)
    {
        mWeight = aWeight;
        mStretch = aStretch;
        mItalic = aItalic;
        mIsUserFont = PR_TRUE;
    }

    virtual ~gfxDWriteFontEntry();

    virtual PRBool IsSymbolFont();

    virtual nsresult GetFontTable(PRUint32 aTableTag,
                                  nsTArray<PRUint8>& aBuffer);

    nsresult ReadCMAP();
protected:
    friend class gfxDWriteFont;
    friend class gfxDWriteFontList;

    virtual gfxFont *CreateFontInstance(const gfxFontStyle *aFontStyle,
                                        PRBool aNeedsBold);
    
    nsresult CreateFontFace(
        IDWriteFontFace **aFontFace,
        DWRITE_FONT_SIMULATIONS aSimulations = DWRITE_FONT_SIMULATIONS_NONE);

    /**
     * A fontentry only needs to have either of these. If it has both only
     * the IDWriteFont will be used.
     */
    nsRefPtr<IDWriteFont> mFont;
    nsRefPtr<IDWriteFontFile> mFontFile;
    DWRITE_FONT_FACE_TYPE mFaceType;
};


class gfxDWriteFontList : public gfxPlatformFontList {
public:
    gfxDWriteFontList();

    static gfxDWriteFontList* PlatformFontList() {
        return static_cast<gfxDWriteFontList*>(sPlatformFontList);
    }

    virtual gfxFontEntry* GetDefaultFont(const gfxFontStyle* aStyle,
                                         PRBool& aNeedsBold);

    virtual gfxFontEntry* LookupLocalFont(const gfxProxyFontEntry *aProxyEntry,
                                          const nsAString& aFontName);

    virtual gfxFontEntry* MakePlatformFont(const gfxProxyFontEntry *aProxyEntry,
                                           const PRUint8 *aFontData,
                                           PRUint32 aLength);
    
    virtual PRBool ResolveFontName(const nsAString& aFontName,
                                   nsAString& aResolvedFontName);

    PRBool GetStandardFamilyName(const nsAString& aFontName,
                                 nsAString& aFamilyName);

private:
    friend class gfxDWriteFontFamily;

    // initialize font lists
    virtual void InitFontList();

    nsresult GetFontSubstitutes();

    /**
     * Fonts listed in the registry as substitutes but for which no actual
     * font family is found.
     */
    nsTArray<nsString> mNonExistingFonts;

    typedef nsDataHashtable<nsStringHashKey, nsRefPtr<gfxFontFamily> > FontTable;

    /**
     * Table of font substitutes, we grab this from the registry to get
     * alternative font names.
     */
    FontTable mFontSubstitutes;
};


#endif /* GFX_DWRITEFONTLIST_H */