Name
extgs:SetBlendMode -- set blend mode
Synopsis
status = extgs:SetBlendMode(bmode)
Function
extgs:SetBlendMode() sets the method of blending.

The bmode parameter must be one of the following constants:

 
#HPDF_BM_NORMAL
#HPDF_BM_MULTIPLY
#HPDF_BM_SCREEN
#HPDF_BM_OVERLAY
#HPDF_BM_DARKEN
#HPDF_BM_LIGHTEN
#HPDF_BM_COLOR_DODGE
#HPDF_BM_COLOR_BUM
#HPDF_BM_HARD_LIGHT
#HPDF_BM_SOFT_LIGHT
#HPDF_BM_DIFFERENCE
#HPDF_BM_EXCLUSHON

When extgs:SetBlendMode() succeeds, it returns #HPDF_OK. Otherwise, it returns an error code and the error handler is invoked.

Inputs
bmode
desired blend mode (see above for possible values)
Results
status
status code
Errors
#HPDF_INVALID_OBJECT - An invalid ExtGState handle was set.

#HPDF_EXT_GSTATE_READ_ONLY - The ExtGState object is read only.

#HPDF_EXT_GSTATE_OUT_OF_RANGE - An invalid value was set at value parameter.

#HPDF_FAILED_TO_ALLOC_MEM - Memory allocation failed.

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