windows-server-2003/windows/advcore/gdiplus/engine/gpmf3216/preamble.c

/*****************************************************************************
*
* Preamble - Preamble routines for MF3216
*
* Date: 7/18/91
* Author: Jeffrey Newman (c-jeffn)
*
* Copyright 1991 Microsoft Corp
*****************************************************************************/


#include "precomp.h"
#pragma hdrstop

BOOL bSetWindowOrgAndExtToFrame(PLOCALDC pLocalDC, RECTL frame);
extern fnSetVirtualResolution pfnSetVirtualResolution;

BOOL GetFrameBounds(PLOCALDC pLocalDC, PENHMETAHEADER pmf32header, RECTL *frameOut)
{

    FLOAT ecxPpmmPlay,        // cx pixels per millimeter play
          ecyPpmmPlay,        // cy pixels per millimeter play
          ecx01PpmmPlay,      // cx pixels per .01 millimeter play
          ecy01PpmmPlay,      // cy pixels per .01 millimeter play
          ecxPelsFrame,       // cx play-time frame in device units
          ecyPelsFrame,       // cy play-time frame in device units
          exPelsFrame,        // x play-time frame in device units
          eyPelsFrame ;       // y play-time frame in device units

    INT cxFrame,            // cx Picture Frame
        cyFrame,            // cy Picture Frame
        xFrame,             // x Picture Frame
        yFrame ;            // y Picture Frame

    SIZEL   szlFrame ;
    POINTL  ptlFrame ;

    ASSERT(frameOut != NULL);
    // Calculate the play-time (reference) pixels per millimeter.

    ecxPpmmPlay = (FLOAT) pLocalDC->cxPlayDevPels / (FLOAT) pLocalDC->cxPlayDevMM ;
    ecyPpmmPlay = (FLOAT) pLocalDC->cyPlayDevPels / (FLOAT) pLocalDC->cyPlayDevMM ;

    // Scale the pixels per millimeter to pixels per .01 millimeters.

    ecx01PpmmPlay = ecxPpmmPlay / 100.0f ;
    ecy01PpmmPlay = ecyPpmmPlay / 100.0f ;

    // Pickup the fram origin

    xFrame = pmf32header->rclFrame.left ;
    yFrame = pmf32header->rclFrame.top ;

    // Translate the frame origin to play-time-device units.

    exPelsFrame = ecx01PpmmPlay * (FLOAT) xFrame ;
    eyPelsFrame = ecy01PpmmPlay * (FLOAT) yFrame ;

    // Convert the Frame origin to play-time-page units.
    // (aka reference-logical units.)

    ptlFrame.x = (LONG) (exPelsFrame * pLocalDC->xformPDevToPPage.eM11 + 0.5f);
    ptlFrame.y = (LONG) (eyPelsFrame * pLocalDC->xformPDevToPPage.eM22 + 0.5f);

    if (!bCoordinateOverflowTest((PLONG) &ptlFrame, 2))
        return(FALSE);

    // Calculate the Frame width and height.

    cxFrame = pmf32header->rclFrame.right - pmf32header->rclFrame.left ;
    cyFrame = pmf32header->rclFrame.bottom - pmf32header->rclFrame.top ;

    if (cxFrame < 0)
    {
        ptlFrame.x += cxFrame;
        cxFrame = -cxFrame;
    }
    if (cyFrame < 0)
    {
        ptlFrame.y += cyFrame;
        cyFrame = -cyFrame;
    }

    // Convert the frame width and height into play-time-device units.
    // (aka reference-device units.)

    ecxPelsFrame = ecx01PpmmPlay * (FLOAT) cxFrame ;
    ecyPelsFrame = ecy01PpmmPlay * (FLOAT) cyFrame ;

    // Translate the play-time device units into play-time-page units.
    // (aka reference-device to reference-logical units.)
    // This is an identity transform for MM_ANISOTROPIC mode.  For other
    // fixed mapping modes, the SetWindowExt record has no effect.
    // The Frame is Inclusive-Inclusive so add 1 to make the WindowExt
    // Inclusive-Exclusive

    szlFrame.cx = (LONG) (ecxPelsFrame + 1.5f);
    szlFrame.cy = (LONG) (ecyPelsFrame + 1.5f);
    if (!bCoordinateOverflowTest((PLONG) &szlFrame, 2))
        return(FALSE);


    frameOut->left   = ptlFrame.x;
    frameOut->top    = ptlFrame.y;
    frameOut->right  = szlFrame.cx + ptlFrame.x;
    frameOut->bottom = szlFrame.cy + ptlFrame.y;
    return(TRUE);
}

/*----------------------------------------------------------------------------
*  DoHeader -  Emit the Win16 metafile header
*---------------------------------------------------------------------------*/
BOOL APIENTRY DoHeader(PLOCALDC pLocalDC, PENHMETAHEADER pemfheader)
{
    BOOL        b ;

    RECTL frameBounds;
    b = bInitHandleTableManager(pLocalDC, pemfheader) ;
    if (b == FALSE)
        goto error_exit ;

    b = bInitXformMatrices(pLocalDC, pemfheader, &frameBounds) ;
    if (b == FALSE)
        goto error_exit ;

    if (pfnSetVirtualResolution == NULL)
    {
        INT swap;
        // On Win9x create the helper DC here
        pLocalDC->hdcHelper = CreateCompatibleDC (NULL);
        if (pLocalDC->hdcHelper == (HDC) 0)
        {
            return FALSE;
        }

        pLocalDC->hbmpMem = CreateCompatibleBitmap(pLocalDC->hdcHelper,
            frameBounds.right - frameBounds.left,
            frameBounds.bottom - frameBounds.top);
        if (pLocalDC->hbmpMem == (HBITMAP) 0)
        {
            return FALSE;
        }

        SelectObject(pLocalDC->hdcHelper, pLocalDC->hbmpMem);
        frameBounds.right -= frameBounds.left;
        frameBounds.bottom -= frameBounds.top;
        frameBounds.left = frameBounds.top = 0;
    }

    // The metafile will always be memory based.

    pLocalDC->mf16Header.mtType    = MEMORYMETAFILE ;
    pLocalDC->mf16Header.mtVersion = 0x300 ;    // magic number for Win3.0
    pLocalDC->mf16Header.mtHeaderSize = sizeof (METAHEADER) / 2 ;

    // Init fields to 0.  They will be updated at the end of translation.

    pLocalDC->mf16Header.mtSize      = 0 ;
    pLocalDC->mf16Header.mtNoObjects = 0 ;
    pLocalDC->mf16Header.mtMaxRecord = 0 ;      // NOTE: We need a max record size.
    pLocalDC->mf16Header.mtNoParameters = 0 ;

    // Emit the MF16 metafile header to the metafile.

    b = bEmit(pLocalDC, &pLocalDC->mf16Header, sizeof(METAHEADER)) ;
    if (b == FALSE)
        goto error_exit ;

    if (pLocalDC->flags & INCLUDE_W32MF_COMMENT)
    {
        b = bHandleWin32Comment(pLocalDC) ;
        if (b == FALSE)
            goto error_exit ;
    }

    // Prepare the transform for the 16-bit metafile.  See comments in
    // xforms.c.

    // Emit the Win16 MapMode record

    b = bEmitWin16SetMapMode(pLocalDC, LOWORD(pLocalDC->iMapMode)) ;
    if (b == FALSE)
        goto error_exit ;

    // Set the Win16 metafile WindowExt to the size of the frame
    // in play-time device units.

    b = bSetWindowOrgAndExtToFrame(pLocalDC, frameBounds) ;
    if (b == FALSE)
    {
        RIPS("MF3216: DoHeader, bSetWindowOrgAndExtToFrame failure\n") ;
        goto error_exit ;
    }

error_exit:
    return(b) ;
}



/*----------------------------------------------------------------------------
* Calculate and Emit into the Win16 metafile a Window origin
* and extent drawing order
* that will set the Window Origin and Extent to the size of the picture  frame in
* play-time-page (reference-logical) units.
*---------------------------------------------------------------------------*/
BOOL bSetWindowOrgAndExtToFrame(PLOCALDC pLocalDC, RECTL frame)
{
    // Set the Window origin.

    if (!bEmitWin16SetWindowOrg(pLocalDC,
        (SHORT) frame.left,
        (SHORT) frame.top))
    {
        RIPS("MF3216: bEmitWin16SetWindowOrg failed\n") ;
        return(FALSE);
    }

    if (!bEmitWin16SetWindowExt(pLocalDC,
        (SHORT) (frame.right - frame.left),
        (SHORT) (frame.bottom - frame.top)))
    {
        RIPS("MF3216: bEmitWin16SetWindowExt failed\n") ;
        return(FALSE);
    }
    return(TRUE);
}


/*----------------------------------------------------------------------------
*  UpdateMf16Header - Update the metafile header with the:
*             metafile size,
*             number of objects,
*             the max record size.
*---------------------------------------------------------------------------*/
BOOL bUpdateMf16Header(PLOCALDC pLocalDC)
{
    BOOL    b ;
    INT     iCpTemp ;

    // Fill in the missing info in the Win16 metafile header.

    pLocalDC->mf16Header.mtSize      = pLocalDC->ulBytesEmitted / 2 ;
    pLocalDC->mf16Header.mtNoObjects = (WORD) (pLocalDC->nObjectHighWaterMark + 1) ;
    pLocalDC->mf16Header.mtMaxRecord = pLocalDC->ulMaxRecord ;

    // Reset the output buffer index to the beginning of the buffer.

    iCpTemp = pLocalDC->ulBytesEmitted ;
    pLocalDC->ulBytesEmitted = 0 ;

    // re-emit the Win16 metafile header.

    b = bEmit(pLocalDC, &pLocalDC->mf16Header, (DWORD) sizeof (pLocalDC->mf16Header)) ;

    pLocalDC->ulBytesEmitted = iCpTemp ;

    return (b) ;

}