Move libraries into subdirectories for better selectivity when building.

[xonotic/xonotic.git] / misc / builddeps / win64 / sdl / share / man / man3 / SDL_DisplayFormatAlpha.3

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+.TH "SDL_DisplayFormatAlpha" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 
+.SH "NAME"
+SDL_DisplayFormatAlpha \- Convert a surface to the display format
+.SH "SYNOPSIS"
+.PP
+\fB#include "SDL\&.h"
+.sp
+\fBSDL_Surface *\fBSDL_DisplayFormatAlpha\fP\fR(\fBSDL_Surface *surface\fR);
+.SH "DESCRIPTION"
+.PP
+This function takes a surface and copies it to a new surface of the pixel format and colors of the video framebuffer plus an alpha channel, suitable for fast blitting onto the display surface\&. It calls \fISDL_ConvertSurface\fR
+.PP
+If you want to take advantage of hardware colorkey or alpha blit acceleration, you should set the colorkey and alpha value before calling this function\&.
+.PP
+This function can be used to convert a colourkey to an alpha channel, if the \fBSDL_SRCCOLORKEY\fP flag is set on the surface\&. The generated surface will then be transparent (alpha=0) where the pixels match the colourkey, and opaque (alpha=255) elsewhere\&.
+.SH "RETURN VALUE"
+.PP
+If the conversion fails or runs out of memory, it returns \fBNULL\fR
+.SH "SEE ALSO"
+.PP
+\fISDL_ConvertSurface\fR, \fISDL_SetAlpha\fR, \fISDL_SetColorKey\fR, \fISDL_DisplayFormat\fR, \fISDL_Surface\fR
+.\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01