Microsoft KB Archive/25335
INF: How to Correctly Set Up a Raster Display Device Driver ID Number: Q25335
2.00 2.03 2.10 3.00 WINDOWS
The following information describes how to set up a raster display device driver that will be able to draw on the screen, draw into main memory, and draw into main memory bitmaps.
The device must be declared to be a raster device, capable of drawing scanlines and polylines. Scanlines and polylines are required of all display drivers. The device driver must be capable of drawing scanlines and polylines into the following:
- Into the device’s screen.
- Into main memory: one plane, 1-bit-per-pixel bitmaps. The programmer can take the existing EGAHIBW sources to all of the routines (for example, BITBLT, OUTPUT, SCANLR, PIXEL, and so on) and call the code in them to accomplish the drawing into monochrome bitmaps. Remove the cursor-exclusion code in these routines to save space.
- Into main memory bitmaps that have the same color format as the device’s screen. The programmers must write their own routines to accomplish this nontrivial task. GDI cannot “magically” draw into bitmaps; it is left to the device driver to accomplish this task.
For more information on this topic, see sections 2.2.2, 2.2.3, and 2.13 of the “Microsoft Windows Device Driver Adaptation Guide.”