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SDLmm_PixelFormat

NAME

SDLmm::PixelFormat -

SYNOPSIS

#include <sdlmm_pixelformat.h>

Public Methods

PixelFormat (SDL_PixelFormat *pixelformat)
Constructor from an SDL_PixelFormat*.
virtual ~PixelFormat ()
The destructor.
Uint8 BitsPerPixel () const

Uint8 BytesPerPixel () const

Uint8 Rshift () const

Uint8 Gshift () const

Uint8 Bshift () const

Uint8 Rloss () const

Uint8 Gloss () const

Uint8 Bloss () const

Uint8 Aloss () const

Uint32 Rmask () const

Uint32 Gmask () const

Uint32 Bmask () const

Uint32 Amask () const

Color colorkey () const

Uint8 alpha () const

SDL_Palette* palette () const

Color MapRGB (Uint8 r, Uint8 g, Uint8 b) const
Map a RGB color value to a pixel format.
Color MapRGB (const ColorRGB &colorrgb) const

Color MapRGBA (Uint8 r, Uint8 g, Uint8 b, Uint8 a) const
Map a RGBA color value to a pixel format.
Color MapRGBA (const ColorRGBA &colorrgba) const

void GetRGB (Color pixel, Uint8 &r, Uint8 &g, Uint8 &b) const
Get RGB values from a pixel in the pixel format of this PixelFormat.
const ColorRGB GetRGB (Color pixel) const

void GetRGBA (Color pixel, Uint8 &r, Uint8 &g, Uint8 &b, Uint8 &a) const
Get RGBA values from a pixel in the pixel format of this PixelFormat.
const ColorRGBA GetRGBA (Color pixel) const

Informational methods

bool valid () const
Returns true if this PixelFormat is initialized, false otherwise.

Protected Attributes

SDL_PixelFormat* me
The actual SDL_PixelFormat for this PixelFormat.

DETAILED DESCRIPTION

Author: Adam Gates

CONSTRUCTOR & DESTRUCTOR DOCUMENTATION

SDLmm::PixelFormat::PixelFormat (SDL_PixelFormat * pixelformat) [inline, explicit]

Constructor from an SDL_PixelFormat*.

This creates a new PixelFormat object from an existing SDL_PixelFormat. It's very important not to free the original pixel format since that will cause problems. Use with caution.

SDLmm::PixelFormat::~PixelFormat () [inline, virtual]

The destructor.

MEMBER FUNCTION DOCUMENTATION

Uint8 SDLmm::PixelFormat::Aloss () const [inline]

Uint32 SDLmm::PixelFormat::Amask () const [inline]

Uint8 SDLmm::PixelFormat::BitsPerPixel () const [inline]

Uint8 SDLmm::PixelFormat::Bloss () const [inline]

Uint32 SDLmm::PixelFormat::Bmask () const [inline]

Uint8 SDLmm::PixelFormat::Bshift () const [inline]

Uint8 SDLmm::PixelFormat::BytesPerPixel () const [inline]

const ColorRGB SDLmm::PixelFormat::GetRGB (Color pixel) const [inline]

void SDLmm::PixelFormat::GetRGB (Color pixel, Uint8 & r, Uint8 & g, Uint8 & b) const

Get RGB values from a pixel in the pixel format of this PixelFormat.

This function uses the entire 8-bit [0..255] range when converting color components from pixel formats with less than 8-bits per RGB component (e.g., a completely white pixel in 16-bit RGB565 format would return [0xff, 0xff, 0xff] not [0xf8, 0xfc, 0xf8]).

Parameters:

pixel

the pixel value

r, g, b

references to integers where the RGB result will be stored.

See also: GetRGBA, MapRGB, MapRGBA

const ColorRGBA SDLmm::PixelFormat::GetRGBA (Color pixel) const [inline]

void SDLmm::PixelFormat::GetRGBA (Color pixel, Uint8 & r, Uint8 & g, Uint8 & b, Uint8 & a) const

Get RGBA values from a pixel in the pixel format of this PixelFormat.

This function uses the entire 8-bit [0..255] range when converting color components from pixel formats with less than 8-bits per RGB component (e.g., a completely white pixel in 16-bit RGB565 format would return [0xff, 0xff, 0xff] not [0xf8, 0xfc, 0xf8]).

Note: If the PixelFormat has no alpha component, the alpha will be returned as 0xff (100% opaque).

Parameters:

pixel

the pixel value

r, g, b, a

references to integers where the RGBA result will be stored.

See also: GetRGB, MapRGB, MapRGBA

Uint8 SDLmm::PixelFormat::Gloss () const [inline]

Uint32 SDLmm::PixelFormat::Gmask () const [inline]

Uint8 SDLmm::PixelFormat::Gshift () const [inline]

Color SDLmm::PixelFormat::MapRGB (const ColorRGB & colorrgb) const [inline]

Color SDLmm::PixelFormat::MapRGB (Uint8 r, Uint8 g, Uint8 b) const

Map a RGB color value to a pixel format.

Maps the RGB color value to this PixelFormat's 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 an alpha component it will be returned as all 1 bits (fully opaque).

Returns: A pixel value best approximating the given RGB 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).

Parameters:

r, g, b

the RGB values.

See also: GetRGB, GetRGBA, MapRGBA

Color SDLmm::PixelFormat::MapRGBA (const ColorRGBA & colorrgba) const [inline]

Color SDLmm::PixelFormat::MapRGBA (Uint8 r, Uint8 g, Uint8 b, Uint8 a) const

Map a RGBA color value to a pixel format.

Maps the RGBA color value to this PixelFormat's 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).

Returns: 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).

Parameters:

r, g, b, a

the RGBA values.

See also: GetRGB, GetRGBA, MapRGB

Uint8 SDLmm::PixelFormat::Rloss () const [inline]

Uint32 SDLmm::PixelFormat::Rmask () const [inline]

Uint8 SDLmm::PixelFormat::Rshift () const [inline]

Uint8 SDLmm::PixelFormat::alpha () const [inline]

Color SDLmm::PixelFormat::colorkey () const [inline]

SDL_Palette * SDLmm::PixelFormat::palette () const [inline]

bool SDLmm::PixelFormat::valid () const [inline]

Returns true if this PixelFormat is initialized, false otherwise.

Warning: Using an uninitialzied PixelFormat can cause many problems.

MEMBER DATA DOCUMENTATION

SDL_PixelFormat * SDLmm::PixelFormat::me [protected]

The actual SDL_PixelFormat for this PixelFormat.

AUTHOR

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