308 lines
9.7 KiB
C
308 lines
9.7 KiB
C
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#ifndef __EXTRICON_H__
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#define __EXTRICON_H__
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///////////////////////////////////////////////////////////////////////////////
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/* File: extricon.h
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Description: Contains implementation of IExtractIcon for the font folder.
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This code provides icon identification for both TrueType and OpenType
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font files. The logic used is as follows:
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TrueType(1) DSIG? CFF? Icon
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------------ ------- ------- -----------
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yes no no TT
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yes no yes OTp
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yes yes no OTt
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yes yes yes OTp
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(1) Files must contain required TrueType tables to be considered
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a TrueType font file.
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This icon handler is used by both the shell and the font folder
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to display TrueType and OpenType font icons. It is designed to be
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easily extensible if support for dynamic icon identification is
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required in other fonts.
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Classes (indentation denotes inheritance):
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CFontIconHandler
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IconHandler
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TrueTypeIconHandler
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NOTE: The design is sort of in a state of limbo right now. Originally
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the idea was to support two types of OpenType icons along with
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the conventional TrueType and raster font icons. The OpenType
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icons were OTt and OTp with the 't' and 'p' meaning "TrueType"
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and "PostScript". Later we decided to only show the icons as
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"OT" without the subscript 't' or 'p'. The code still distinguishes
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the difference but we just use the same "OT" icon for both the
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OTt and OTp conditions. Make sense? Anyway, This OTt and OTp
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stuff may come back at a later date (GDI guys haven't decided)
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so I'm leaving that code in place. [brianau - 4/7/98]
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Revision History:
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Date Description Programmer
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-------- --------------------------------------------------- ----------
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06/13/97 Initial creation. BrianAu
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04/08/98 Removed OpenTypeIconHandler and folded it into BrianAu
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TrueTypeIconHandler. There's no need for the
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separation. Also added detection of "required"
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TrueType tables.
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*/
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///////////////////////////////////////////////////////////////////////////////
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//
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// Pure virtual base class for all types of icon handlers.
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//
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class IconHandler
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{
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public:
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//
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// Simple encapsulation of a mapped file for opening font files.
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//
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class MappedFile
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{
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public:
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MappedFile(VOID)
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: m_hFile(INVALID_HANDLE_VALUE),
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m_hFileMapping(INVALID_HANDLE_VALUE),
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m_pbBase(NULL) { }
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~MappedFile(VOID);
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HRESULT Open(LPCTSTR pszFile);
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VOID Close(VOID);
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LPBYTE Base(VOID)
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{ return m_pbBase; }
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private:
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HANDLE m_hFile;
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HANDLE m_hFileMapping;
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LPBYTE m_pbBase;
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//
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// Prevent copy.
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//
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MappedFile(const MappedFile& rhs);
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MappedFile& operator = (const MappedFile& rhs);
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};
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virtual ~IconHandler(VOID) { };
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//
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// Derived classes implement this to retrieve the index (ID) of the
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// desired icon in fontext.dll.
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//
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virtual INT GetIconIndex(LPCTSTR pszFileName) = 0;
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//
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// Derived classes implement this to retrieve the large and small
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// icons corresponding to an index. The index should be one returned
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// from GetIconIndex().
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//
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virtual HRESULT GetIcons(UINT iIconIndex, HICON *phiconLarge, HICON *phiconSmall) = 0;
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//
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// This static function creates an icon handler object of the proper
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// derived type for the font file extension specified in pszFileExt.
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//
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static IconHandler *Create(LPCTSTR pszFile);
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};
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/*
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//
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// This is a template for creating a new type of icon handler for
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// other types of font files.
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//
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// To create a new handler:
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// 1. Create new handler class from template below.
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// 2. Provide implementations for GetIconIndex and GetIcons.
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// 3. Load icons in constructor. See OpenTypeIconHandler as an example.
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// 4. Modify IconHandler::Create() to instantiate the new handler type.
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//
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class XXXXIconHandler : public IconHandler
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{
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public:
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XXXXIconHandler(VOID);
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virtual INT GetIconIndex(LPCTSTR pszFileName);
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virtual HRESULT GetIcons(UINT iIconIndex, HICON *phiconLarge, HICON *phiconSmall);
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private:
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static HICON m_hiconLarge;
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static HICON m_hiconSmall;
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};
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*/
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//
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// Icon handler for TrueType font files.
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//
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class TrueTypeIconHandler : public IconHandler
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{
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public:
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TrueTypeIconHandler(DWORD dwTables);
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~TrueTypeIconHandler(void);
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virtual INT GetIconIndex(LPCTSTR pszFileName);
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virtual HRESULT GetIcons(UINT iIconIndex, HICON *phiconLarge, HICON *phiconSmall);
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//
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// Scans TTF or OTF file identifying tables.
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// Used by TrueTypeIconHandler and any subclasses.
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//
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static BOOL GetFileTables(LPCTSTR pszFile, LPDWORD pfTables);
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enum TABLES {
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//
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// These are the only tables we're interested in.
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//
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TABLE_CFF = 0x00000001,
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TABLE_DSIG = 0x00000002,
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TABLE_HEAD = 0x00000004,
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TABLE_NAME = 0x00000008,
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TABLE_CMAP = 0x00000010,
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TABLE_HHEA = 0x00000020,
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TABLE_HMTX = 0x00000040,
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TABLE_OS2 = 0x00000080,
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TABLE_POST = 0x00000100,
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TABLE_GLYF = 0x00000200,
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TABLE_MAXP = 0x00000400,
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TABLE_LOCA = 0x00000800,
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TABLE_TTCF = 0x00001000 // this is a pseudo table.
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};
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static DWORD RequiredOpenTypeTables(void)
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{ return (TABLE_CMAP |
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TABLE_HEAD |
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TABLE_HHEA |
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TABLE_HMTX |
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TABLE_MAXP |
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TABLE_NAME |
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TABLE_POST |
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TABLE_OS2); }
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static DWORD RequiredTrueTypeTables(void)
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{ return (RequiredOpenTypeTables() |
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TABLE_GLYF |
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TABLE_LOCA); }
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protected:
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enum eIcons {iICON_LARGE_TT,
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iICON_SMALL_TT,
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iICON_LARGE_OTt,
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iICON_SMALL_OTt,
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iICON_LARGE_OTp,
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iICON_SMALL_OTp,
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iICON_LARGE_TTC,
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iICON_SMALL_TTC,
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MAX_ICONS };
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DWORD m_dwTables;
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HICON m_rghIcons[MAX_ICONS]; // Array of icon handles.
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private:
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static BOOL ReadFileTables(IconHandler::MappedFile& file, LPDWORD pfTables);
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static INT FilterReadFileTablesException(INT nException);
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HICON GetIcon(int iIcon);
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};
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//
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// Declaration for the DLL's icon handler.
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// This is the object that is instantiated whenever a client asks CLSID_FontExt
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// for IID_IExtractIcon or IID_IPersistFile.
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//
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class CFontIconHandler : public IExtractIconW,
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public IExtractIconA,
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public IPersistFile
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{
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public:
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CFontIconHandler(VOID);
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~CFontIconHandler(VOID);
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//
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// IUnknown methods.
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//
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STDMETHODIMP
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QueryInterface(
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REFIID riid,
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LPVOID *ppvOut);
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STDMETHODIMP_(ULONG)
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AddRef(
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VOID);
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STDMETHODIMP_(ULONG)
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Release(
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VOID);
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//
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// IExtractIconW methods.
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//
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STDMETHODIMP Extract(
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LPCWSTR pszFileW,
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UINT nIconIndex,
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HICON *phiconLarge,
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HICON *phiconSmall,
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UINT nIconSize);
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STDMETHODIMP GetIconLocation(
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UINT uFlags,
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LPWSTR szIconFileW,
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UINT cchMax,
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int *piIndex,
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UINT *pwFlags);
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//
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// IExtractIconA methods.
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//
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STDMETHODIMP Extract(
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LPCSTR pszFileA,
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UINT nIconIndex,
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HICON *phiconLarge,
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HICON *phiconSmall,
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UINT nIconSize);
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STDMETHODIMP GetIconLocation(
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UINT uFlags,
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LPSTR szIconFileA,
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UINT cchMax,
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int *piIndex,
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UINT *pwFlags);
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//
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// IPersist methods.
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//
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STDMETHODIMP GetClassID(
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CLSID *pClassID);
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//
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// IPersistFile methods.
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//
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STDMETHODIMP IsDirty(
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VOID);
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STDMETHODIMP Load(
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LPCOLESTR pszFileName,
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DWORD dwMode);
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STDMETHODIMP Save(
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LPCOLESTR pszFileName,
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BOOL fRemember);
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STDMETHODIMP SaveCompleted(
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LPCOLESTR pszFileName);
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STDMETHODIMP GetCurFile(
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LPOLESTR *ppszFileName);
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private:
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LONG m_cRef;
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TCHAR m_szFileName[MAX_PATH]; // Name of icon file.
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IconHandler *m_pHandler; // Ptr to type-specific handler.
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static TCHAR m_szFontExtDll[MAX_PATH]; // Path to FONTEXT.DLL
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INT GetIconIndex(VOID);
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HRESULT GetIcons(UINT iIconIndex, HICON *phiconLarge, HICON *phiconSmall);
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};
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#endif // __EXTRICON_H__
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