mlib_imagemulalpha(3mlib) [opensolaris man page]

mlib_ImageMulAlpha(3MLIB)				    mediaLib Library Functions					 mlib_ImageMulAlpha(3MLIB)

NAME

       mlib_ImageMulAlpha - alpha channel multiplication

SYNOPSIS

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

       mlib_status mlib_ImageMulAlpha(mlib_image *dst, const mlib_image *src,
	    mlib_s32 cmask);

DESCRIPTION

       The mlib_ImageMulAlpha() function multiplies color channels by the alpha channel on a pixel by pixel basis.

       For the MLIB_BYTE image, it uses the following equation:

	 dst[x][y][c] = src[x][y][c] * src[x][y][a] * 2**(-8)

       For the MLIB_SHORT image, it uses the following equation:

	 dst[x][y][c] = src[x][y][c] * src[x][y][a] * 2**(-15)

       For the MLIB_USHORT image, it uses the following equation:

	 dst[x][y][c] = src[x][y][c] * src[x][y][a] * 2**(-16)

       For the MLIB_INT image, it uses the following equation:

	 dst[x][y][c] = src[x][y][c] * src[x][y][a] * 2**(-31)

       where c and a are the indices for the color channels and the alpha channel, respectively, so c != a.

PARAMETERS

       The function takes the following arguments:

       dst	Pointer to destination image.

       src	Pointer to source image.

       cmask	Channel  mask  to indicate the alpha channel. Each bit of the mask represents a channel in the image. The channel corresponding to
		the 1 bit of cmask is the alpha channel.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageMulAlpha_Inp(3MLIB), mlib_ImageMulAlpha_Fp(3MLIB), mlib_ImageMulAlpha_Fp_Inp(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007						 mlib_ImageMulAlpha(3MLIB)

mlib_ImageBlendColor(3MLIB)				    mediaLib Library Functions				       mlib_ImageBlendColor(3MLIB)

NAME

       mlib_ImageBlendColor - blend an image and a color

SYNOPSIS

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

       mlib_status mlib_ImageBlendColor(mlib_image *dst, const mlib_image *src, const mlib_s32 *color, mlib_s32 cmask);

DESCRIPTION

       The mlib_ImageBlendColor() function blends an image and a color with the alpha channel.

       It uses the following equation:

       Cd = Cs*As + Cc*(1 - As)
       Ad = 1.0

       where, Cs and Cd are the RGB color components of the source and destination images, respectively. As and Ad are the alpha components of the
       source and destination images, respectively. Cc is the color component of the constant color.

       For MLIB_BYTE images, the alpha coefficients are in Q8 format. For MLIB_SHORT images, the alpha coefficients are in Q15 format and must	be
       positive.  For  MLIB_USHORT images, the alpha coefficients are in Q16 format. For MLIB_INT images, the alpha coefficients are in Q31 format
       and must be positive.

       The images can have two to four channels. The length of color array must not be less than the number of channels in the images.

PARAMETERS

       The function takes the following arguments:

       dst	       Pointer to destination image.

       src	       Pointer to source image.

       color	       Array of constant color components.

       cmask	       Channel mask to indicate the alpha channel. Each bit of cmask represents a channel in the image. The channel  corresponding
		       to the highest bit with value 1 is the alpha channel.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageBlendColor_Inp(3MLIB), mlib_ImageBlendColor_Fp(3MLIB), mlib_ImageBlendColor_Fp_Inp(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 				       mlib_ImageBlendColor(3MLIB)