effect.c

CC386 is a general-purpose 32-bit C compiler. It is not an optimizing compiler but given that the co

/* 
Copyright 2001-2003 Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  

You may contact the author at:

mailto::[e-mail]

or by snail mail at:

David Lindauer
850 Washburn Ave Apt 99
Louisville, KY 40222

 **********************************************************************

EFFECT.C holds basic code for getting the bitmaps on the toolbars and to
the left of the edit window to match the appropriate background colors.

 **********************************************************************

 */
#include <windows.h>
#include <ctype.h>

#define DSPDxax   0x00E20746L

#define RGBBLACK     RGB(0,0,0)
#define RGBWHITE     RGB(255,255,255)

VOID FAR PASCAL ChangeBitmapColorDC(HDC hdcBM, LPBITMAP lpBM, COLORREF rgbOld,
    COLORREF rgbNew);



/*************************************************************************
 *
 * ChangeBitmapColor()
 *
 *    This function translates the colors in a bitmap from one
 *    to another.
 *
 * Parameters:
 *
 *    HBITMAP hbmSrc  - Bitmap to process
 *    COLORREF rgbOld - Source color
 *    COLORREF rgbNew - Destination color
 *
 * Return value: none.
 *
 * History:   Date      Author      Reason
 *            6/10/91   CKindel     Created
 *            1/28/92   MarkBad     Split "Graying" functionality out into
 *                                    separate API, added palette param
 *
 *************************************************************************/

VOID ChangeBitmapColor(HBITMAP hbmSrc, COLORREF rgbOld, COLORREF rgbNew)
{
    HDC hDC;
    HDC hdcMem;
    BITMAP bmBits;

    if (hDC = GetDC(NULL))
    {
        if (hdcMem = CreateCompatibleDC(hDC))
        {
            //
            // Get the bitmap struct needed by ChangeBitmapColorDC()
            //
            GetObject(hbmSrc, sizeof(BITMAP), (LPSTR) &bmBits);

            //
            // Select our bitmap into the memory DC
            //
            hbmSrc = SelectObject(hdcMem, hbmSrc);

            //
            // Translate the sucker
            //
            ChangeBitmapColorDC(hdcMem, &bmBits, rgbOld, rgbNew);

            //
            // Unselect our bitmap before deleting the DC
            //
            hbmSrc = SelectObject(hdcMem, hbmSrc);

            DeleteDC(hdcMem);
        }

        ReleaseDC(NULL, hDC);
    }
} /* ChangeBitmapColor()  */


/*************************************************************************
 *
 * ChangeBitmapColorDC()
 *
 * This function makes all pixels in the given DC that have the
 * color rgbOld have the color rgbNew.  This function is used by
 * ChangeBitmapColor().
 *
 * Parameters:
 *
 * HDC hdcBM        - Memory DC containing bitmap
 * LPBITMAP lpBM    - Long pointer to bitmap structure from hdcBM
 * COLORREF rgbOld  - Source color
 * COLORREF rgbNew  - Destination color
 *
 * Return value: none.
 *
 * History:   Date      Author      Reason
 *            6/10/91   CKindel     Created
 *            1/23/92   MarkBad     Added big nifty comments which explain
 *                                  how this works, split bitmap graying 
 *                                  code out
 *
 *************************************************************************/

VOID FAR PASCAL ChangeBitmapColorDC(HDC hdcBM, LPBITMAP lpBM, COLORREF rgbOld,
    COLORREF rgbNew)
{
    HDC hdcMask;
    HBITMAP hbmMask, hbmOld;
    HBRUSH hbrOld;

    if (!lpBM)
        return ;

    //
    // if the bitmap is mono we have nothing to do
    //

    if (lpBM->bmPlanes == 1 && lpBM->bmBitsPixel == 1)
        return ;

    //
    // To perform the color switching, we need to create a monochrome 
    // "mask" which is the same size as our color bitmap, but has all 
    // pixels which match the old color (rgbOld) in the bitmap set to 1.  
    // 
    // We then use the ROP code "DSPDxax" to Blt our monochrome 
    // bitmap to the color bitmap.  "D" is the Destination color 
    // bitmap, "S" is the source monochrome bitmap, and "P" is the 
    // selected brush (which is set to the replacement color (rgbNew)).  
    // "x" and "a" represent the XOR and AND operators, respectively.
    // 
    // The DSPDxax ROP code can be explained as having the following 
    // effect:
    // 
    // "Every place the Source bitmap is 1, we want to replace the 
    // same location in our color bitmap with the new color.  All 
    // other colors we leave as is."
    // 
    // The truth table for DSPDxax is as follows:
    // 
    //       D S P Result
    //       - - - ------
    //       0 0 0   0
    //       0 0 1   0
    //       0 1 0   0
    //       0 1 1   1
    //       1 0 0   1
    //       1 0 1   1
    //       1 1 0   0
    //       1 1 1   1
    // 
    // (Even though the table is assuming monochrome D (Destination color), 
    // S (Source color), & P's (Pattern color), the results apply to color 
    // bitmaps also). 
    //
    // By examining the table, every place that the Source is 1 
    // (source bitmap contains a 1), the result is equal to the 
    // Pattern at that location.  Where S is zero, the result equals 
    // the Destination.  
    // 
    // See Section 11.2 (page 11-4) of the "Reference -- Volume 2" for more
    // information on the Termary Raster Operation codes.
    //

    if (hbmMask = CreateBitmap(lpBM->bmWidth, lpBM->bmHeight, 1, 1, NULL))
    {
        if (hdcMask = CreateCompatibleDC(hdcBM))
        {
            //
            // Select th mask bitmap into the mono DC
            //
            hbmOld = SelectObject(hdcMask, hbmMask);

            // 
            // Create the brush and select it into the source color DC --
            // this is our "Pattern" or "P" color in our DSPDxax ROP.
            //

            hbrOld = SelectObject(hdcBM, CreateSolidBrush(rgbNew));

            // 
            // To create the mask, we will use a feature of BitBlt -- when
            // converting from Color to Mono bitmaps, all Pixels of the
            // background colors are set to WHITE (1), and all other pixels
            // are set to BLACK (0).  So all pixels in our bitmap that are
            // rgbOld color, we set to 1.
            //

            SetBkColor(hdcBM, rgbOld);
            BitBlt(hdcMask, 0, 0, lpBM->bmWidth, lpBM->bmHeight, hdcBM, 0, 0,
                SRCCOPY);

            //
            // Where the mask is 1, lay down the brush, where it is 0, leave
            // the destination.
            //

            SetBkColor(hdcBM, RGBWHITE);
            SetTextColor(hdcBM, RGBBLACK);

            BitBlt(hdcBM, 0, 0, lpBM->bmWidth, lpBM->bmHeight, hdcMask, 0, 0,
                DSPDxax);

            SelectObject(hdcMask, hbmOld);

            hbrOld = SelectObject(hdcBM, hbrOld);
            DeleteObject(hbrOld);

            DeleteDC(hdcMask);
        }
        else
            return ;

        DeleteObject(hbmMask);
    }
    else
        return ;
} /* ChangeBitmapColorDC()  */