AlphaCompColorKey
Performs color keying and alpha composition of two
images.
Syntax
IppStatus
ippiAlphaCompColorKey_8u_AC4R
(
const Ipp8u*
pSrc1
, int
src1Step
, Ipp8u
alpha1
, const Ipp8u*
pSrc2
, int
src2Step
, Ipp8u
alpha2
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
, Ipp8u
colorKey
[4], IppiAlphaType
alphaType
);
Include Files
ippi.h
Domain Dependencies
Headers:
ippcore.h
, ippvm.h
, ipps.h
Libraries:
ippcore.lib
, ippvm.lib
, ipps.lib
Parameters
- pSrc1,pSrc2
- Pointer to the source images ROI.
- src1Step, src2Step
- Distances in bytes between starts of consecutive lines in the source images.
- alpha1,alpha2
- Alpha value.
- pDst
- Pointer to the destination image ROI.
- dstStep
- Distance in bytes between starts of consecutive lines in the destination image.
- roiSize
- Size of the source and destination ROI in pixels.
- colorKey
- Array of color values.
- alphaType
- The type of composition to perform (without pre-multiplying). See Table“Possible Values of alphaType Parameter”for more details.
Description
This function operates with ROI (see Regions of Interest in Intel
IPP).
This function replaces all areas of the source image
pSrc1
containing the specified
key color colorKey
with
the corresponding pixels of the background image pSrc2
and additionally
performs alpha composition (see supported Table “Types of Image Compositing
Operations”
) in accordance with the parameter alphaType
. Note the alpha
channel in the pDst
is
not changed after color keying.The parameter
alphaType
should not be set to the values intended for operations
with pre-multiplying.Return Values
- ippStsNoErr
- Indicates no error. Any other value indicates an error.
- ippStsNullPtrErr
- Indicates an error condition if one of the specified pointers isNULL.
- ippStsSizeErr
- Indicates an error condition ifroiSizehas a field with a zero or negative value.
- ippStsStepErr
- Indicates an error condition if one of the step values is less than or equal to 0.
- ippStsAlphaTypeErr
- Indicates an error condition ifalphaTypespecifies the unsupported type of composition.