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.TH SDL_PremultiplyAlpha 3 "SDL 3.2.8" "Simple Directmedia Layer" "SDL3 FUNCTIONS"
.SH NAME
SDL_PremultiplyAlpha \- Premultiply the alpha on a block of pixels\[char46]
.SH HEADER FILE
Defined in SDL3/SDL_surface\[char46]h

.SH SYNOPSIS
.nf
.B #include \(dqSDL3/SDL.h\(dq
.PP
.BI "bool SDL_PremultiplyAlpha(int width, int height, SDL_PixelFormat src_format, const void *src, int src_pitch, SDL_PixelFormat dst_format, void *dst, int dst_pitch, bool linear);
.fi
.SH DESCRIPTION
This is safe to use with src == dst, but not for other overlapping areas\[char46]

.SH FUNCTION PARAMETERS
.TP
.I width
the width of the block to convert, in pixels\[char46]
.TP
.I height
the height of the block to convert, in pixels\[char46]
.TP
.I src_format
an 
.BR SDL_PixelFormat
 value of the
.BR src
pixels format\[char46]
.TP
.I src
a pointer to the source pixels\[char46]
.TP
.I src_pitch
the pitch of the source pixels, in bytes\[char46]
.TP
.I dst_format
an 
.BR SDL_PixelFormat
 value of the
.BR dst
pixels format\[char46]
.TP
.I dst
a pointer to be filled in with premultiplied pixel data\[char46]
.TP
.I dst_pitch
the pitch of the destination pixels, in bytes\[char46]
.TP
.I linear
true to convert from sRGB to linear space for the alpha multiplication, false to do multiplication in sRGB space\[char46]
.SH RETURN VALUE
Returns true on success or false on failure; call

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

.SH AVAILABILITY
This function is available since SDL 3\[char46]2\[char46]0\[char46]