dc.h

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//
// $Id: dc.h,v 1.6 2000/07/26 07:43:06 weiym Exp $
//
// dc.h: this head file declares all 
// internal types and data of GDI module.
//
// Copyright (c) 1999, 2000, Mr. Wei Yongming.
//

#ifndef _DC_H
    #define _DC_H
    
#ifdef __cplusplus
extern "C" {
#endif  /* __cplusplus */

#define DCSLOTNUMBER        20

// Device Context
typedef struct
{
    short DataType;  // the data type, always be TYPE_HDC
    short DCType;    // the dc type
        
    BOOL inuse;
    HWND hwnd;

    // graphics context
    GAL_GC gc;

    // background color and mode.
    gal_pixel bkcolor;
    int bkmode;

    // brush attributes
    int brushtype;
    gal_pixel brushcolor;
    POINT BrushOrig;

    // pen attributes
    int pentype;
    gal_pixel pencolor;
    POINT CurPenPos;

    // device rect
    BOOL bIsClient;
    RECT DevRC;

    // text attibutes
    gal_pixel textcolor;
    PLOGFONT pLogFont;
    int nDefTabStop;
    POINT CurTextPos;
    int cExtra;     // Character extra
    int alExtra;    // Above line extra
    int blExtra;    // Bellow line extra

    // mappping mode and relative parameters.
    int mapmode;
    POINT ViewOrig;
    POINT ViewExtent;
    POINT WindowOrig;
    POINT WindowExtent;

    // clip region information
    CLIPRGN  lcrgn;
    CLIPRGN  ecrgn;

    PGCRINFO pGCRInfo;
    int      oldage;
}DC;
typedef DC* PDC;

extern DC ScreenDC;

// This function convert HDC to PDC.
static inline PDC dc_HDC2PDC(HDC hdc)
{
    if(hdc == HDC_SCREEN)
        return &ScreenDC;

    return (PDC) hdc;
}

static inline BOOL dc_IsMemHDC(HDC hdc)
{
    if(hdc == HDC_SCREEN) return FALSE;
    return (((PDC)hdc)->DCType == TYPE_MEMDC);
}

static inline BOOL dc_IsScreenHDC(HDC hdc)
{
    return (hdc == HDC_SCREEN);
}

static inline BOOL dc_IsGeneralHDC(HDC hdc)
{
    if(hdc == HDC_SCREEN) return FALSE;
    return (((PDC)hdc)->DCType == TYPE_GENDC);
}

static inline BOOL dc_IsMemDC(PDC pdc)
{
    return (pdc->DCType == TYPE_MEMDC);
}

static inline BOOL dc_IsScreenDC(PDC pdc)
{
    return (pdc->DCType == TYPE_SCRDC);
}

static inline BOOL dc_IsGeneralDC(PDC pdc)
{
    return (pdc->DCType == TYPE_GENDC);
}

static inline BOOL dc_IsVisible (PDC pdc)
{
    PMAINWIN pParent;
    
    if (pdc->DCType != TYPE_GENDC)
        return TRUE;
    
    if (pdc->hwnd == HWND_DESKTOP)
        return TRUE;

    pParent = ((PMAINWIN)(pdc->hwnd))->pMainWin;

    if (pParent && !(pParent->dwStyle & WS_VISIBLE))
        return FALSE;

    return ((PMAINWIN)(pdc->hwnd))->dwStyle & WS_VISIBLE;
}

static inline void coor_LP2SP(PDC pdc, int* x, int* y)
{
    if(pdc == &ScreenDC)
        return;

    if (pdc->mapmode == MM_TEXT) {
        *x += pdc->DevRC.left;
        *y += pdc->DevRC.top;
    }
    else {
        *x = pdc->DevRC.left + (*x - pdc->WindowOrig.x)
             * pdc->ViewExtent.x / pdc->WindowExtent.x
             + pdc->ViewOrig.x;

        *y = pdc->DevRC.top + (*y - pdc->WindowOrig.y)
             * pdc->ViewExtent.y / pdc->WindowExtent.y
             + pdc->ViewOrig.y;
    }
}

static inline void coor_SP2LP(PDC pdc, int* x, int* y)
{
    if(pdc == &ScreenDC)
        return;

    *x -= pdc->DevRC.left;
    *y -= pdc->DevRC.top;

    if (pdc->mapmode != MM_TEXT) {
        *x = (*x - pdc->ViewOrig.x)
             * pdc->WindowExtent.x / pdc->ViewExtent.x
             + pdc->WindowOrig.x;

        *y = (*y - pdc->ViewOrig.y)
             * pdc->WindowExtent.y / pdc->ViewExtent.y
             + pdc->WindowOrig.y;
    }
}

static inline void extent_x_LP2SP (PDC pdc, int* extent)
{
    if (pdc == &ScreenDC || pdc->mapmode == MM_TEXT)
        return;

    *extent = *extent * pdc->ViewExtent.x / pdc->WindowExtent.x;
}

static inline void extent_x_SP2LP (PDC pdc, int* extent)
{
    if (pdc == &ScreenDC || pdc->mapmode == MM_TEXT)
        return;

    *extent = *extent * pdc->WindowExtent.x / pdc->ViewExtent.x;
}

static inline void extent_y_LP2SP (PDC pdc, int* extent)
{
    if (pdc == &ScreenDC || pdc->mapmode == MM_TEXT)
        return;

    *extent = *extent * pdc->ViewExtent.y / pdc->WindowExtent.y;
}

static inline void extent_y_SP2LP (PDC pdc, int* extent)
{
    if (pdc == &ScreenDC || pdc->mapmode == MM_TEXT)
        return;

    *extent = *extent * pdc->WindowExtent.y / pdc->ViewExtent.y;
}

#ifdef __cplusplus
}
#endif  /* __cplusplus */

#endif // _DC_H