include/SDL_pixels.h
author Edgar Simo <bobbens@gmail.com>
Mon, 04 Aug 2008 17:30:17 +0000
branchgsoc2008_force_feedback
changeset 2592 8152dd46fbe2
parent 2275 12ea0fdc0df2
child 2673 24a6b3588eac
permissions -rw-r--r--
Changed effect comparison a bit.

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/

/**
 * \file SDL_pixels.h
 *
 * Header for the enumerated pixel format definitions
 */

#ifndef _SDL_pixels_h
#define _SDL_pixels_h

#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#endif

/* Transparency definitions: These define alpha as the opacity of a surface */
#define SDL_ALPHA_OPAQUE 255
#define SDL_ALPHA_TRANSPARENT 0

enum
{                               /* Pixel type */
    SDL_PIXELTYPE_UNKNOWN,
    SDL_PIXELTYPE_INDEX1,
    SDL_PIXELTYPE_INDEX4,
    SDL_PIXELTYPE_INDEX8,
    SDL_PIXELTYPE_PACKED8,
    SDL_PIXELTYPE_PACKED16,
    SDL_PIXELTYPE_PACKED32,
    SDL_PIXELTYPE_ARRAYU8,
    SDL_PIXELTYPE_ARRAYU16,
    SDL_PIXELTYPE_ARRAYU32,
    SDL_PIXELTYPE_ARRAYF16,
    SDL_PIXELTYPE_ARRAYF32
};

enum
{                               /* bitmap pixel order, high bit -> low bit */
    SDL_BITMAPORDER_NONE,
    SDL_BITMAPORDER_4321,
    SDL_BITMAPORDER_1234
};
enum
{                               /* packed component order, high bit -> low bit */
    SDL_PACKEDORDER_NONE,
    SDL_PACKEDORDER_XRGB,
    SDL_PACKEDORDER_RGBX,
    SDL_PACKEDORDER_ARGB,
    SDL_PACKEDORDER_RGBA,
    SDL_PACKEDORDER_XBGR,
    SDL_PACKEDORDER_BGRX,
    SDL_PACKEDORDER_ABGR,
    SDL_PACKEDORDER_BGRA
};
enum
{                               /* array component order, low byte -> high byte */
    SDL_ARRAYORDER_NONE,
    SDL_ARRAYORDER_RGB,
    SDL_ARRAYORDER_RGBA,
    SDL_ARRAYORDER_ARGB,
    SDL_ARRAYORDER_BGR,
    SDL_ARRAYORDER_BGRA,
    SDL_ARRAYORDER_ABGR
};

enum
{                               /* Packed component layout */
    SDL_PACKEDLAYOUT_NONE,
    SDL_PACKEDLAYOUT_332,
    SDL_PACKEDLAYOUT_4444,
    SDL_PACKEDLAYOUT_1555,
    SDL_PACKEDLAYOUT_5551,
    SDL_PACKEDLAYOUT_565,
    SDL_PACKEDLAYOUT_8888,
    SDL_PACKEDLAYOUT_2101010,
    SDL_PACKEDLAYOUT_1010102
};

#define SDL_DEFINE_PIXELFOURCC(A, B, C, D) \
    ((A) | ((B) << 8) | ((C) << 16) | ((D) << 24))

#define SDL_DEFINE_PIXELFORMAT(type, order, layout, bits, bytes) \
    ((1 << 31) | ((type) << 24) | ((order) << 20) | ((layout) << 16) | \
     ((bits) << 8) | ((bytes) << 0))

#define SDL_PIXELTYPE(X)	(((X) >> 24) & 0x0F)
#define SDL_PIXELORDER(X)	(((X) >> 20) & 0x0F)
#define SDL_PIXELLAYOUT(X)	(((X) >> 16) & 0x0F)
#define SDL_BITSPERPIXEL(X)	(((X) >> 8) & 0xFF)
#define SDL_BYTESPERPIXEL(X)	(((X) >> 0) & 0xFF)

#define SDL_ISPIXELFORMAT_INDEXED(format)   \
    ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX1) || \
     (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX4) || \
     (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX8))

#define SDL_ISPIXELFORMAT_FOURCC(format)    \
    ((format) && !((format) & 0x80000000))

enum
{
    SDL_PIXELFORMAT_UNKNOWN,
    SDL_PIXELFORMAT_INDEX1LSB =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_1234, 0,
                               1, 0),
    SDL_PIXELFORMAT_INDEX1MSB =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_4321, 0,
                               1, 0),
    SDL_PIXELFORMAT_INDEX4LSB =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_1234, 0,
                               2, 0),
    SDL_PIXELFORMAT_INDEX4MSB =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_4321, 0,
                               2, 0),
    SDL_PIXELFORMAT_INDEX8 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX8, 0, 0, 8, 1),
    SDL_PIXELFORMAT_RGB332 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED8, SDL_PACKEDORDER_XRGB,
                               SDL_PACKEDLAYOUT_332, 8, 1),
    SDL_PIXELFORMAT_RGB444 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
                               SDL_PACKEDLAYOUT_4444, 12, 2),
    SDL_PIXELFORMAT_RGB555 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
                               SDL_PACKEDLAYOUT_1555, 15, 2),
    SDL_PIXELFORMAT_ARGB4444 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
                               SDL_PACKEDLAYOUT_4444, 16, 2),
    SDL_PIXELFORMAT_ARGB1555 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
                               SDL_PACKEDLAYOUT_1555, 16, 2),
    SDL_PIXELFORMAT_RGB565 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
                               SDL_PACKEDLAYOUT_565, 16, 2),
    SDL_PIXELFORMAT_RGB24 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_RGB, 0,
                               24, 3),
    SDL_PIXELFORMAT_BGR24 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_BGR, 0,
                               24, 3),
    SDL_PIXELFORMAT_RGB888 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XRGB,
                               SDL_PACKEDLAYOUT_8888, 24, 4),
    SDL_PIXELFORMAT_BGR888 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XBGR,
                               SDL_PACKEDLAYOUT_8888, 24, 4),
    SDL_PIXELFORMAT_ARGB8888 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
                               SDL_PACKEDLAYOUT_8888, 32, 4),
    SDL_PIXELFORMAT_RGBA8888 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_RGBA,
                               SDL_PACKEDLAYOUT_8888, 32, 4),
    SDL_PIXELFORMAT_ABGR8888 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ABGR,
                               SDL_PACKEDLAYOUT_8888, 32, 4),
    SDL_PIXELFORMAT_BGRA8888 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_BGRA,
                               SDL_PACKEDLAYOUT_8888, 32, 4),
    SDL_PIXELFORMAT_ARGB2101010 =
        SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
                               SDL_PACKEDLAYOUT_2101010, 32, 4),

    SDL_PIXELFORMAT_YV12 =      /* Planar mode: Y + V + U  (3 planes) */
        SDL_DEFINE_PIXELFOURCC('Y', 'V', '1', '2'),
    SDL_PIXELFORMAT_IYUV =      /* Planar mode: Y + U + V  (3 planes) */
        SDL_DEFINE_PIXELFOURCC('I', 'Y', 'U', 'V'),
    SDL_PIXELFORMAT_YUY2 =      /* Packed mode: Y0+U0+Y1+V0 (1 plane) */
        SDL_DEFINE_PIXELFOURCC('Y', 'U', 'Y', '2'),
    SDL_PIXELFORMAT_UYVY =      /* Packed mode: U0+Y0+V0+Y1 (1 plane) */
        SDL_DEFINE_PIXELFOURCC('U', 'Y', 'V', 'Y'),
    SDL_PIXELFORMAT_YVYU =      /* Packed mode: Y0+V0+Y1+U0 (1 plane) */
        SDL_DEFINE_PIXELFOURCC('Y', 'V', 'Y', 'U')
};

typedef struct SDL_Color
{
    Uint8 r;
    Uint8 g;
    Uint8 b;
    Uint8 unused;
} SDL_Color;
#define SDL_Colour SDL_Color

typedef struct SDL_Palette SDL_Palette;
typedef int (*SDL_PaletteChangedFunc) (void *userdata, SDL_Palette * palette);

typedef struct SDL_PaletteWatch
{
    SDL_PaletteChangedFunc callback;
    void *userdata;
    struct SDL_PaletteWatch *next;
} SDL_PaletteWatch;

struct SDL_Palette
{
    int ncolors;
    SDL_Color *colors;

    int refcount;
    SDL_PaletteWatch *watch;
};

/* Everything in the pixel format structure is read-only */
typedef struct SDL_PixelFormat
{
    SDL_Palette *palette;
    Uint8 BitsPerPixel;
    Uint8 BytesPerPixel;
    Uint8 Rloss;
    Uint8 Gloss;
    Uint8 Bloss;
    Uint8 Aloss;
    Uint8 Rshift;
    Uint8 Gshift;
    Uint8 Bshift;
    Uint8 Ashift;
    Uint32 Rmask;
    Uint32 Gmask;
    Uint32 Bmask;
    Uint32 Amask;
} SDL_PixelFormat;

/**
 * \fn SDL_bool SDL_PixelFormatEnumToMasks(Uint32 format, int *bpp, Uint32 * Rmask, Uint32 * Gmask, Uint32 * Bmask, Uint32 * Amask)
 *
 * \brief Convert one of the enumerated pixel formats to a bpp and RGBA masks.
 *
 * \return SDL_TRUE, or SDL_FALSE if the conversion wasn't possible.
 *
 * \sa SDL_MasksToPixelFormatEnum()
 */
extern DECLSPEC SDL_bool SDLCALL SDL_PixelFormatEnumToMasks(Uint32 format,
                                                            int *bpp,
                                                            Uint32 * Rmask,
                                                            Uint32 * Gmask,
                                                            Uint32 * Bmask,
                                                            Uint32 * Amask);

/**
 * \fn Uint32 SDL_MasksToPixelFormatEnum(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
 *
 * \brief Convert a bpp and RGBA masks to an enumerated pixel format.
 *
 * \return The pixel format, or SDL_PixelFormat_Unknown if the conversion wasn't possible.
 *
 * \sa SDL_PixelFormatEnumToMasks()
 */
extern DECLSPEC Uint32 SDLCALL SDL_MasksToPixelFormatEnum(int bpp,
                                                          Uint32 Rmask,
                                                          Uint32 Gmask,
                                                          Uint32 Bmask,
                                                          Uint32 Amask);

/**
 * \fn SDL_Palette *SDL_AllocPalette(int ncolors)
 *
 * \brief Create a palette structure with the specified number of color entries.
 *
 * \return A new palette, or NULL if there wasn't enough memory
 *
 * \note The palette entries are initialized to white.
 *
 * \sa SDL_FreePalette()
 */
extern DECLSPEC SDL_Palette *SDLCALL SDL_AllocPalette(int ncolors);

/**
 * \fn int SDL_AddPaletteWatch(SDL_Palette *palette, SDL_PaletteChangedFunc callback, void *userdata)
 *
 * \brief Add a callback function which is called when the palette changes.
 *
 * \sa SDL_DelPaletteWatch()
 */
extern DECLSPEC int SDLCALL SDL_AddPaletteWatch(SDL_Palette * palette,
                                                SDL_PaletteChangedFunc
                                                callback, void *userdata);

/**
 * \fn void SDL_DelPaletteWatch(SDL_Palette *palette, SDL_PaletteChangedFunc callback, void *userdata)
 *
 * \brief Remove a callback function previously added with SDL_AddPaletteWatch()
 *
 * \sa SDL_AddPaletteWatch()
 */
extern DECLSPEC void SDLCALL SDL_DelPaletteWatch(SDL_Palette * palette,
                                                 SDL_PaletteChangedFunc
                                                 callback, void *userdata);

/**
 * \fn int SDL_SetPaletteColors(SDL_Palette *palette, const SDL_Colors *colors, int firstcolor, int numcolors)
 *
 * \brief Set a range of colors in a palette.
 *
 * \param palette The palette to modify
 * \param colors An array of colors to copy into the palette
 * \param firstcolor The index of the first palette entry to modify
 * \param ncolors The number of entries to modify
 *
 * \return 0 on success, or -1 if not all of the colors could be set
 */
extern DECLSPEC int SDLCALL SDL_SetPaletteColors(SDL_Palette * palette,
                                                 const SDL_Color * colors,
                                                 int firstcolor, int ncolors);

/**
 * \fn void SDL_FreePalette(SDL_Palette *palette)
 *
 * \brief Free a palette created with SDL_AllocPalette()
 *
 * \sa SDL_AllocPalette()
 */
extern DECLSPEC void SDLCALL SDL_FreePalette(SDL_Palette * palette);

/**
 * \fn Uint32 SDL_MapRGB(const SDL_PixelFormat *format,
 *                       Uint8 r, Uint8 g, Uint8 b)
 *
 * \brief Maps an RGB triple to an opaque pixel value for a given pixel format
 *
 * \sa SDL_MapRGBA
 */
extern DECLSPEC Uint32 SDLCALL SDL_MapRGB(const SDL_PixelFormat * format,
                                          Uint8 r, Uint8 g, Uint8 b);

/**
 * \fn Uint32 SDL_MapRGBA(const SDL_PixelFormat *fmt,
 *                        Uint8 r, Uint8 g, Uint8 b, Uint8 a)
 *
 * \brief Maps an RGBA quadruple to a pixel value for a given pixel format
 *
 * \sa SDL_MapRGB
 */
extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(const SDL_PixelFormat * format,
                                           Uint8 r, Uint8 g, Uint8 b,
                                           Uint8 a);

/**
 * \fn void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * format,
 *                     Uint8 * r, Uint8 * g, Uint8 * b)
 *
 * \brief Maps a pixel value into the RGB components for a given pixel format
 *
 * \sa SDL_GetRGBA
 */
extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel,
                                        const SDL_PixelFormat * format,
                                        Uint8 * r, Uint8 * g, Uint8 * b);

/**
 * \fn void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * format,
 *                      Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
 *
 * \brief Maps a pixel value into the RGBA components for a given pixel format
 *
 * \sa SDL_GetRGB
 */
extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel,
                                         const SDL_PixelFormat * format,
                                         Uint8 * r, Uint8 * g, Uint8 * b,
                                         Uint8 * a);

/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"

#endif /* _SDL_pixels_h */

/* vi: set ts=4 sw=4 expandtab: */