Bitmap Functions, Macros, and Data

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Windows Embedded CE 6.0 R3

4/8/2010

The Wxutil.h header file in the DirectShow base classes provides functions and macros to help convert between VIDEOINFOHEADERand BITMAPINFOstructures.

Programming element	Description
BIT_MASKS_MATCH	Compares the masks of two video images.
BITMASKS	Retrieves a pointer to the array of bitmasks for the specified VIDEOINFOHEADERstructure.
COLORS	Retrieves a pointer to an array of RGBQUADstructures that describes the color palette for the specified VIDEOINFOHEADERstructure.
DIBSIZE	Calculates the byte size of the specified bitmap
HEADER	Retrieves a pointer to the image data from the specified video image.
MPEG1_SEQUENCE_INFO	Retrieves the sequence header for the specified MPEG-1 video image.
PALETTISED	Checks if the video image's color palette is 8-bit or less.
PALETTE_ENTRIES	Returns the number of colors in the video image's palette.
RESET_MASKS	Clears the specified video image's bitmasks.
RESET_HEADER	Clears the specified video image.
RESET_PALETTE	Clears the specified video image's color palette.
SIZE_EGA_PALETTE	Calculates the size of the EGA (4-bit) color palette.
SIZE_MASKS	Calculates the size of the mask's color palette.
SIZE_MPEG1VIDEOINFO	Calculates the size of the specified MPEG-1 video image.
SIZE_PALETTE	Calculates the size of the 8-bit color palette.
SIZE_PREHEADER	Calculates the byte offset for the video image's bitmap information.
SIZE_VIDEOHEADER	Calculates the size of the video image.
TRUECOLOR	Retrieves a pointer to an array of TRUECOLORINFOstructures that describes the bitmasks and color palette for the specified VIDEOINFOHEADERstructure.

These functions are made available to help manage VIDEOINFOHEADERstructures, which are used throughout DirectShow to describe video data streams.

Although similar to the BITMAPINFOstructure used in Microsoft Win32® and existing multimedia, VIDEOINFOHEADERalso adds some new video-specific fields.

Global data	Description
bits555	Array of color bitmasks for an RGB 555 bitmap.
bits565	Array of color bitmasks for an RGB 565 bitmap.
bits888	Array of color bitmasks for an RGB 24-bit bitmap.

See Also

Reference