gecko-dev/gfx/thebes/gfxFT2FontList.h

/* -*- 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_FT2FONTLIST_H
#define GFX_FT2FONTLIST_H

#include "mozilla/MemoryReporting.h"
#include "gfxPlatformFontList.h"
#include "mozilla/gfx/UnscaledFontFreeType.h"

namespace mozilla {
    namespace dom {
        class FontListEntry;
    };
};
using mozilla::dom::FontListEntry;

class FontNameCache;
typedef struct FT_FaceRec_* FT_Face;
class nsZipArchive;

class FT2FontEntry : public gfxFontEntry
{
public:
    FT2FontEntry(const nsAString& aFaceName) :
        gfxFontEntry(aFaceName),
        mFTFace(nullptr),
        mFontFace(nullptr),
        mFTFontIndex(0)
    {
    }

    ~FT2FontEntry();

    const nsString& GetName() const {
        return Name();
    }

    // create a font entry for a downloaded font
    static FT2FontEntry* 
    CreateFontEntry(const nsAString& aFontName,
                    uint16_t aWeight,
                    int16_t aStretch,
                    uint8_t aStyle,
                    const uint8_t* aFontData,
                    uint32_t aLength);

    // create a font entry representing an installed font, identified by
    // a FontListEntry; the freetype and cairo faces will not be instantiated
    // until actually needed
    static FT2FontEntry*
    CreateFontEntry(const FontListEntry& aFLE);

    // Create a font entry for a given freetype face; if it is an installed font,
    // also record the filename and index.
    // aFontData (if non-nullptr) is NS_Malloc'ed data that aFace depends on,
    // to be freed after the face is destroyed
    static FT2FontEntry* 
    CreateFontEntry(FT_Face aFace,
                    const char *aFilename, uint8_t aIndex,
                    const nsAString& aName,
                    const uint8_t* aFontData = nullptr);

    virtual gfxFont *CreateFontInstance(const gfxFontStyle *aFontStyle,
                                        bool aNeedsBold) override;

    // Create (if necessary) and return the cairo_font_face for this font.
    // This may fail and return null, so caller must be prepared to handle this.
    cairo_font_face_t *CairoFontFace();

    // Create a cairo_scaled_font for this face, with the given style.
    // This may fail and return null, so caller must be prepared to handle this.
    cairo_scaled_font_t *CreateScaledFont(const gfxFontStyle *aStyle);

    nsresult ReadCMAP(FontInfoData *aFontInfoData = nullptr) override;

    virtual hb_blob_t* GetFontTable(uint32_t aTableTag) override;

    virtual nsresult CopyFontTable(uint32_t aTableTag,
                                   nsTArray<uint8_t>& aBuffer) override;

    // Check for various kinds of brokenness, and set flags on the entry
    // accordingly so that we avoid using bad font tables
    void CheckForBrokenFont(gfxFontFamily *aFamily);

    virtual void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
                                        FontListSizes* aSizes) const override;
    virtual void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
                                        FontListSizes* aSizes) const override;

    FT_Face mFTFace;
    cairo_font_face_t *mFontFace;

    nsCString mFilename;
    uint8_t   mFTFontIndex;

    mozilla::WeakPtr<mozilla::gfx::UnscaledFont> mUnscaledFont;
};

class FT2FontFamily : public gfxFontFamily
{
public:
    // Flags to indicate whether a font should be "visible" in the global
    // font list (available for use in font-family), or "hidden" (available
    // only to support a matching data: URI used in @font-face).
    typedef enum {
        kVisible,
        kHidden
    } Visibility;

    FT2FontFamily(const nsAString& aName) :
        gfxFontFamily(aName) { }

    // Append this family's faces to the IPC fontlist
    void AddFacesToFontList(InfallibleTArray<FontListEntry>* aFontList,
                            Visibility aVisibility);
};

class gfxFT2FontList : public gfxPlatformFontList
{
public:
    gfxFT2FontList();
    virtual ~gfxFT2FontList();

    virtual gfxFontEntry* LookupLocalFont(const nsAString& aFontName,
                                          uint16_t aWeight,
                                          int16_t aStretch,
                                          uint8_t aStyle);

    virtual gfxFontEntry* MakePlatformFont(const nsAString& aFontName,
                                           uint16_t aWeight,
                                           int16_t aStretch,
                                           uint8_t aStyle,
                                           const uint8_t* aFontData,
                                           uint32_t aLength);

    void GetSystemFontList(InfallibleTArray<FontListEntry>* retValue);

    static gfxFT2FontList* PlatformFontList() {
        return static_cast<gfxFT2FontList*>(gfxPlatformFontList::PlatformFontList());
    }

    virtual void GetFontFamilyList(nsTArray<RefPtr<gfxFontFamily> >& aFamilyArray);

    void WillShutdown();

protected:
    typedef enum {
        kUnknown,
        kStandard
    } StandardFile;

    // initialize font lists
    virtual nsresult InitFontListForPlatform() override;

    void AppendFaceFromFontListEntry(const FontListEntry& aFLE,
                                     StandardFile aStdFile);

    void AppendFacesFromFontFile(const nsCString& aFileName,
                                 FontNameCache *aCache,
                                 StandardFile aStdFile,
                                 FT2FontFamily::Visibility aVisibility);

    void AppendFacesFromOmnijarEntry(nsZipArchive *aReader,
                                     const nsCString& aEntryName,
                                     FontNameCache *aCache,
                                     bool aJarChanged);

    // the defaults here are suitable for reading bundled fonts from omnijar
    void AppendFacesFromCachedFaceList(const nsCString& aFileName,
                                       const nsCString& aFaceList,
                                       StandardFile aStdFile = kStandard,
                                       FT2FontFamily::Visibility aVisibility =
                                           FT2FontFamily::kVisible);

    void AddFaceToList(const nsCString& aEntryName, uint32_t aIndex,
                       StandardFile aStdFile,
                       FT2FontFamily::Visibility aVisibility,
                       FT_Face aFace, nsCString& aFaceList);

    void FindFonts();

    void FindFontsInOmnijar(FontNameCache *aCache);

    void FindFontsInDir(const nsCString& aDir, FontNameCache* aFNC,
                        FT2FontFamily::Visibility aVisibility);

    virtual gfxFontFamily*
    GetDefaultFontForPlatform(const gfxFontStyle* aStyle) override;

    nsTHashtable<nsStringHashKey> mSkipSpaceLookupCheckFamilies;

private:
    FontFamilyTable mHiddenFontFamilies;

    mozilla::UniquePtr<FontNameCache> mFontNameCache;
    int64_t mJarModifiedTime;
    nsCOMPtr<nsIObserver> mObserver;
};

#endif /* GFX_FT2FONTLIST_H */