mlib_VideoColorRGBint_to_BGRAint

- convert RGB interleaved to BGRA interleaved

Synopsis

cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>

void mlib_VideoColorRGBint_to_BGRAint(mlib_u8 *bgra,
     const mlib_u8 *rgb, const mlib_u8 *a_array,
     mlib_u8 a_const, mlib_s32 w, mlib_s32 h,
     mlib_s32 dlb, mlib_s32 slb, mlib_s32 alb);

Description

The interleaved RGB stream and the A values are combined into an interleaved BGRA byte stream.

The alpha values for this function work in the following fashion:

• If the a_array pointer is not NULL, the values are taken from there. It has to have the at least 1/3 the dimension of the RGB buffer.

• If the a_array pointer is NULL, the alpha values for every pixel are set to a_const.

In other words, this function's inner loop works like this:

bgra[0] = rgb[2];
bgra[1] = rgb[1];
bgra[2] = rgb[0];
bgra[3] = (a_array == NULL) ? a_const : a_array[0];

Parameters

The function takes the following arguments:

bgra

Pointer to the output BGRA buffer.

rgb

Pointer to the input RGB buffer.

a_array

Pointer to the alpha buffer.

a_const

Constant alpha value.

w

Image width in pixels.

h

Image height in lines.

dlb

Linebytes of the output buffer.

slb

Linebytes of the input buffer.

alb

Linebytes of the alpha buffer.

Return Values

None.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

mlib_VideoColorRGBint_to_ABGRint(3MLIB), attributes(5)