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- Sample: MaskBlt Function Demonstration
-
- Summary:
-
- The MASKBLT sample is an easy-to-use demonstration of the
- MaskBlt Win32 API function. The program presents a dialog
- box on the top of the window; through this dialog box the
- user can manipulate the parameters to MaskBlt. In the main
- window, the source bitmap is displayed in the center third
- of the window, the monochrome bitmap mask is displayed in
- the right third of the window, and the destination bitmap is
- displayed on the left.
-
- More Information:
-
- The destination rectangle may be changed directly in the
- dialog box, or it may be changed by using the direct
- manipulation object in the left third of the window.
- Clicking and dragging the mouse in the upper-left corner
- moves the rectangle; clicking and dragging the mouse in the
- lower-right corner sizes the rectangle. The function
- requires only a starting point (not a rectangle) for the
- source and mask bitmaps. There is one additional direct
- manipulation object for the source and one for the mask.
- These objects may be moved by clicking and dragging with the
- mouse.
-
- The raster operation for the MaskBlt call may be changed by
- altering the values in the right most entry fields. The
- contents are interpreted to be in hexadecimal. There is a
- combo box directly beneath these entry fields that lists all
- of the standard raster operations. If the user selects a
- standard ROP from this combo box, its contents are copied
- into the ROP entry fields and are then used in the MaskBlt
- call.
-
- This sample provides clipboard support in the following manner.
- Hitting <ctrl>+<insert> will copy the destination image into the
- clipboard. Hitting <shift>+<insert> will copy a bitmap from the
- clipboard into the source region. Hitting <alt>+<insert> will
- do both; the destination image will be copied into the clipboard
- and then down to the source region.
-
- The following is a list of the Win32 API functions used in
- this sample:
-
- _lclose DPtoLP LineTo ReleaseCapture
- _lopen EndPaint LoadAccelerators ReleaseDC
- _lread FillRect LoadIcon SelectClipRgn
- AngleArc GetClassLong LoadCursor SelectObject
- BeginPaint GetClientRect LocalAlloc SendDlgItemMessage
- BitBlt GetClipboardData LocalFree SendMessage
- ClientToScreen GetClipBox LocalHandle SetCapture
- CloseClipBoard GetDC LPtoDP SetClipboardData
- CreateCompatibleBitmap GetDlgItemInt MaskBlt SetCursorPos
- CreateCompatibleDC GetDlgItemtext MessageBox SetDlgItemInt
- CreateDialog GetFileSize ModifyWorldTransform SetDlgItemText
- CreateDIBitmap GetMessage MoveToEx SetROP2
- CreatePen GetObject OpenClipboard SetViewportOrgEx
- CreateRectRgnIndirect GetStockObject OpenFile SetWindowPos
- CreateWindow GetViewportOrgEx PostMessage SetWorldTransform
- DeleteDC GetWorldTransform PostQuitMessage ShowWindow
- DeleteObject InvalidateRect PtInRect StretchBlt
- DispatchMessage IsWindow Rectangle
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