PRB: PaintRgn() Fills Incorrectly with Hatched Brushes

Last reviewed: November 2, 1995
Article ID: Q82169

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) for Windows version 3.1
Microsoft Win32 Application Programming Interface (API) included with:
```
    - Microsoft Windows 95 version 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.

Additional reference words: 3.10 4.00 95
KBCategory: kbgraphic kbprb
KBSubcategory: GdiDrw

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Last reviewed: November 2, 1995
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