sdl_maprgba(3) [redhat man page]

SDL_MapRGBA(3)							 SDL API Reference						    SDL_MapRGBA(3)

NAME

       SDL_MapRGBA- Map a RGBA color value to a pixel format.

SYNOPSIS

       #include "SDL.h"

       Uint32 SDL_MapRGBA(SDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

DESCRIPTION

       Maps the RGBA color value to the specified pixel format and returns the pixel value as a 32-bit int.

       If the format has a palette (8-bit) the index of the closest matching color in the palette will be returned.

       If the specified pixel format has no alpha component the alpha value will be ignored (as it will be in formats with a palette).

RETURN VALUE

       A  pixel  value	best approximating the given RGBA color value for a given pixel format. If the pixel format bpp (color depth) is less than
       32-bpp then the unused upper bits of the return value can safely be ignored (e.g., with a 16-bpp format the return value can be assigned to
       a Uint16, and similarly a Uint8 for an 8-bpp format).

SEE ALSO

       SDL_GetRGB, SDL_GetRGBA, SDL_MapRGB, SDL_PixelFormat

SDL
							      Tue 11 Sep 2001, 23:01						    SDL_MapRGBA(3)

pods::SDL::PixelFormat(3pm)				User Contributed Perl Documentation			       pods::SDL::PixelFormat(3pm)

NAME

       SDL::PixelFormat - Stores surface format information

   CATEGORY
       Core, Video, Structure

SYNOPSIS

	       my $surface = SDL::Surface->new( ...
	       $surface->format; #this returns the PixelFormat object attached to this surface

       PixelFormat is only created in a "SDL::Surface". This module only provides getters to the surface's pixelformat. Later on we will provide
       setting capability.

DESCRIPTION

       An "SDL::PixelFormat " stores surface format information

METHODS

   palette
	       $surface->format->palette;

       Returns the "SDL_Palette" and SDL::Palette of the format of the surface.

   BitsPerPixel
	       $surface->format->BitsPerPixel;

       The number of bits used to represent each pixel in a surface. Usually 8, 16, 24 or 32. (1 to 7 are not allowed when creating a surface or
       open a video mode

   BytesPerPixel
	       $surface->format->BytesPerPixel;

       The number of bytes used to represent each pixel in a surface. Usually one to four.

   [RGBA]loss
	       $surface->format->Rloss; #red   loss
	       $surface->format->Bloss; #blue  loss
	       $surface->format->Gloss; #green loss
	       $surface->format->Aloss; #alpha loss

       Precision loss of each color component (2[RGBA]loss)

   [RGBA]shift
	       $surface->format->Rshift; #red	shift
	       $surface->format->Bshift; #blue	shift
	       $surface->format->Gshift; #green shift
	       $surface->format->Ashift; #alpha shift

       Binary left shift of each color component in the pixel value

   [RGBA]mask
	       $surface->format->Rmask; #red   mask
	       $surface->format->Bmask; #blue  mask
	       $surface->format->Gmask; #green mask
	       $surface->format->Amask; #alpha mask

       Binary left shift of each color component in the pixel value

   colorkey
	       $surface->format->colorkey;

       Pixel value of transparent pixels.

   alpha
	       $surface->format->alpha;

       Overall surface alpha value

SEE ALSO

       SDL::Surface

AUTHORS

       See "AUTHORS" in SDL.

perl v5.14.2							    2012-05-28					       pods::SDL::PixelFormat(3pm)