Frequently Asked Questions
How many colors will my display mode support
Question:
How do I find the number of colors the current display mode
supports?
Answer:
You can find the color depth of a display context in the following
manner:
GetDeviceCaps(Form1.Canvas.Handle, BITSPIXEL) *
GetDeviceCaps(Form1.Canvas.Handle, PLANES)
Will give you the total number of bits used to color a pixel. possible
Return values of:
1 = 2 colors bpp
4 = 16 colors bpp
8 = 256 colors bpp
15 = 32768 colors (will return 16 on most drivers) bpp
16 = 65535 colors bpp
24 = 16,777,216 colors bpp
32 = 16,777,216 colors (same as 24) bpp
You can use:
NumberOfColors := (1 shl
(GetDeviceCaps(Form1.Canvas.Handle, BITSPIXEL) *
GetDeviceCaps(Form1.Canvas.Handle, PLANES));
to calculate the total number of colors.
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