Bitmap Functions
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4/8/2010
The Wxutil.h header file in the DirectShow base classes provides functions and macros to help convert between VIDEOINFOHEADER and BITMAPINFO structures.
| Programming element | Description |
|---|---|
Checks if the video image contains a color palette. |
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Finds the number of bits per pixel. |
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Finds the size (in bytes) needed to build a VIDEOINFOHEADER structure and related data. |
|
Finds the first palette entry in a VIDEOINFOHEADER structure. |
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Finds the size (in bytes) needed to hold an image. |
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Finds the GUID subtype for a given bitmap info header structure. |
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Finds the (debug) name for a given GUID subtype. |
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Finds the GUID subtype for a given bitmap header. |
These functions are made available to help manage VIDEOINFOHEADER structures, which are used throughout DirectShow to describe video data streams.
Although similar to the BITMAPINFO structure used in Microsoft® Win32® and existing multimedia, VIDEOINFOHEADER also 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. |