PARSEBIT.exe Directly Accesses the Bits of DIB Section

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After you build the sample, run it, and then load a large BMP file. Once the file is loaded into a DIB section, you have two options for displaying it: use the Windows GDI to convert it via a BitBlt() or use the code in the sample to convert it. Both of these options can be selected from the "Display" menu. After you make your selection, the program will time how long it takes to display the bitmap using the selected method. On Windows 95, the difference between the two methods will be minimal because Windows 95 uses a similar optimization. However, on Windows NT, you'll probably find that the code in the sample is quite a bit faster than the BitBlt() provided by the OS.

The following files are a part of the PARSEBIT sample:

• Palette.h Palette.C - Contains all of the functions relating to creating and manipulating Windows palettes.
• DIB.h DIB.c - Contains all of the code for loading and converting DIBs and DDBs
• FastBlt.h FastBlt.c - Contains the code for converting between high/true color and 8 bit per pixel DIB sections by walking the bits.
• FastDemo.c - Provides a simple demonstration of the functionality provided by the code in FastBlt().