PRB: PaintRgn() Fills Incorrectly with Hatched Brushes

• Microsoft Windows Software Development Kit (SDK) 3.1
• Microsoft Win32 Application Programming Interface (API), used with:
  • Microsoft Windows 95
  • Microsoft Windows NT 4.0

SYMPTOMS

When the TRANSPARENT background mode and a mapping mode other than MM_TEXT are selected and an application calls the PaintRgn() API to fill a complex region with a hatched brush, a disconnected pattern results.

CAUSE

The Windows Graphics Device Interface (GDI) draws a complex region by filling the individual rectangles that make up the region. The code to compute the position of each rectangle on the screen fails when the screen coordinates are not in units of pixels. The error is visible when a hatched brush style is used in TRANSPARENT mode.

RESOLUTION

When a hatched brush and TRANSPARENT background mode are required, use the MM_TEXT mapping mode.

STATUS

This behavior is by design.

Additional query words: 3.10 4.00 win16sdk

Keywords : kbNTOS400 kbSDKWin32 kbWinOS95
Version : WINDOWS:3.1,95; winnt:4.0
Platform : WINDOWS winnt
Issue type : kbprb