imagecls.h

WIN32高级程序设计书附源码

/*
**  IMAGECLS.H
**  Header for ImageClass.
**
**  Author:     C A Marriott
**  Created:    19-FEB-93
*/


#if !defined IMAGECLASS

#define IMAGECLASS

//  Image formats:

const int FI_GIF        = 0;        // GIF
const int FI_DIB        = 1;        // DIB


//  Image class.

class ImageClass {

    HWND hWnd;                      // image window handle

    HMENU hMenu;                    // image menu handle.
    HMENU hMenuWindow;              // Window submenu handle.

    char achFileName[128];          // original filename
    int nFileFormat;                // original file format

    WORD nUpdateCount;              // count of image updates

    BOOL bDIBToDevice;              // blit image to device
    BOOL bImageValid;               // image is OK to draw

    HPALETTE hpalCurrent;           // handle to GDI palette for image
    HANDLE   hdibCurrent;           // handle to CF_DIB memory block
    HBITMAP  hbmCurrent;            // handle to current memory BITMAP

    // Private member functions:

    HBITMAP BitmapFromDib ( HANDLE hdib, HPALETTE hpal );
    HPALETTE CreateBIPalette ( LPBITMAPINFOHEADER lpbi );
    HPALETTE CreateDibPalette ( HANDLE hbi );
    BOOL DibBlt (HDC hdc, int x0, int y0, int dx, int dy, HANDLE hdib, int x1, int y1, LONG rop);
    BOOL DibInfo ( HANDLE hbi, LPBITMAPINFOHEADER lpbi );
    WORD DibNumColors( VOID FAR *pv );  // return number of colours in a DIB
    BOOL DrawBitmap ( HDC hdc, int x, int y, HBITMAP hbm, DWORD rop );
    void FreeData();                    // free all data
    void GetRealClientRect ( HWND hwnd, PRECT lprc );
    void IdentifyFileFormat();          // identify format of file
    DWORD lread (int fh, VOID FAR *pv, DWORD ul );  // read HUGE data from file
    HANDLE OpenDIB();                   // create memory DIB from file
    WORD PaletteSize( VOID FAR *pv );   // return size of palette
    BOOL ReadDIB();                     // top level DIB reading function
    HANDLE ReadDibBitmapInfo ( int );   // read DIB header information
    BOOL ReadGIF();                     // top level GIF reading function

    // Public member functions:

public:

    ImageClass( HWND, LPSTR );          // constructor - create image from file
    ~ImageClass();                      // destructor

    void Draw( HWND, HDC, int, int );   // draw image
    void GetImageDimensions( int *pWidth, int *pHeight );
    void Paint( HWND hWnd );            // respond to WM_PAINT message
    void PaletteChanged( HWND hWnd );   // respond to WM_PALETTECHANGED message
    int QueryNewPalette( HWND hWnd );   // respond to WM_QUERYNEWPALETTE message
    void SetCaption( HWND hWnd );       // set window caption
    void SetMenu( HWND );               // set menu
    void SetScrollRanges( HWND hwnd );  // set scroll bar ranges
    void SetWindowSize( HWND hWnd );    // size window to image
};


typedef ImageClass *PIMAGE;             // pointer to image
typedef ImageClass FAR *LPIMAGE;        // far pointer to image

#endif