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.TH SDL_PremultiplyAlpha 3 "SDL 3.1.0" "SDL" "SDL3 FUNCTIONS"
.SH NAME
SDL_PremultiplyAlpha \- Premultiply the alpha on a block of pixels\[char46]
.SH SYNOPSIS
.nf
.B #include \(dqSDL3/SDL.h\(dq
.PP
.BI "int SDL_PremultiplyAlpha(int width, int height, SDL_PixelFormatEnum src_format, const void *src, int src_pitch, SDL_PixelFormatEnum dst_format, void *dst, int dst_pitch);
.fi
.SH DESCRIPTION
This is safe to use with src == dst, but not for other overlapping areas\[char46]

This function is currently only implemented for

.BR SDL_PIXELFORMAT_ARGB8888
\[char46]

.SH FUNCTION PARAMETERS
.TP
.I width
the width of the block to convert, in pixels
.TP
.I height
the height of the block to convert, in pixels
.TP
.I src_format
an 
.BR SDL_PixelFormatEnum
 value of the
.BR src
pixels format
.TP
.I src
a pointer to the source pixels
.TP
.I src_pitch
the pitch of the source pixels, in bytes
.TP
.I dst_format
an 
.BR SDL_PixelFormatEnum
 value of the
.BR dst
pixels format
.TP
.I dst
a pointer to be filled in with premultiplied pixel data
.TP
.I dst_pitch
the pitch of the destination pixels, in bytes
.SH RETURN VALUE
Returns 0 on success or a negative error code on failure; call

.BR SDL_GetError
() for more information\[char46]

.SH AVAILABILITY
This function is available since SDL 3\[char46]0\[char46]0\[char46]