🚀 go-pugleaf

"Renald Yazmir" <renald@partmaker.com> wrote in message 
news:47e13843@newsgroups.borland.com...

> The code below works ok if when I draw transparent pict in the
> child window. When I use it to draw pict on the menu it does
> not draw at all.

Your drawing code expects an HWND as input, from which an HDC is retreived. 
But menu items do not have an HWND of their own.  You need to change your 
code to draw onto the HDC that the DRAWITEMSTRUCT provides to you, ie:

    draw_transparent_picture_hwnd(lpdis->hDC, PICT_SAVE, &menu_rect, RGB(0, 
128, 128));

    void draw_transparent_picture(HDC hdc, int pictid, RECT *rct, COLORREF 
picture_background_color)
    {
        BITMAP bitmap;
        COLORREF crOldBack   = 0;
        HDC dcImage     = NULL;
        HDC dcTrans     = NULL;
        HBITMAP pOldBitmapImage  = NULL;
        HBITMAP bitmapTrans   = NULL;
        HBITMAP pOldBitmapTrans  = NULL;
        HBITMAP hBitmap    = NULL;
        HDC hMemDC     = NULL;

        hMemDC = CreateCompatibleDC(hDC);
        if( hMemDC == NULL )
            return;

        hBitmap = LoadBitmap(res_lib, MAKEINTRESOURCE(pictid));
        if( hBitmap == NULL )
            return;

        crOldBack = SetBkColor(hdc, RGB(255, 255, 255));

        // Create two memory dcs for the image and the mask
        dcImage = CreateCompatibleDC(hdc);
        dcTrans = CreateCompatibleDC(hdc);

        // Select the image into the appropriate dc
        pOldBitmapImage = (HBITMAP) SelectObject(dcImage, hBitmap);

        // Create the mask bitmap
        GetObject(hBitmap, sizeof(BITMAP), &bitmap);
        bitmapTrans = CreateBitmap(bitmap.bmWidth, bitmap.bmHeight, 1, 1, 
NULL);

        // Select the mask bitmap into the appropriate dc
        pOldBitmapTrans = (HBITMAP) SelectObject(dcTrans, bitmapTrans);

        // Build mask based on transparent colour
        SetBkColor(dcImage, picture_background_color);
        BitBlt(dcTrans, 0, 0, bitmap.bmWidth, bitmap.bmHeight, dcImage, 0, 
0, SRCCOPY);

        // Do the work - True Mask method - cool if not actual display
        BitBlt(hdc, rct->left, rct->top, bitmap.bmWidth, bitmap.bmHeight, 
dcImage, 0, 0, SRCINVERT);
        BitBlt(hdc, rct->left, rct->top, bitmap.bmWidth, bitmap.bmHeight, 
dcTrans, 0, 0, SRCAND);
        BitBlt(hdc, rct->left, rct->top, bitmap.bmWidth, bitmap.bmHeight, 
dcImage, 0, 0, SRCINVERT);

        // Restore settings
        SelectObject(dcImage, pOldBitmapImage);
        SelectObject(dcTrans, pOldBitmapTrans);
        SetBkColor(hdc, crOldBack);

        DeleteDC (hMemDC);
        DeleteDC (dcImage);
        DeleteDC (dcTrans);
    }


Gambit