include/SDL_pixels.h
author Sam Lantinga <slouken@libsdl.org>
Fri, 11 Mar 2011 08:49:20 -0800
changeset 5466 006883d5fa51
parent 5438 b705640cb34a
child 5535 96594ac5fd1a
permissions -rw-r--r--
Gamma support is back!

New API functions:
SDL_SetWindowBrightness()
SDL_GetWindowBrightness()
SDL_SetWindowGammaRamp()
SDL_GetWindowGammaRamp()
SDL_CalculateGammaRamp()
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2011 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 /**
    24  *  \file SDL_pixels.h
    25  *  
    26  *  Header for the enumerated pixel format definitions.
    27  */
    28 
    29 #ifndef _SDL_pixels_h
    30 #define _SDL_pixels_h
    31 
    32 #include "begin_code.h"
    33 /* Set up for C function definitions, even when using C++ */
    34 #ifdef __cplusplus
    35 /* *INDENT-OFF* */
    36 extern "C" {
    37 /* *INDENT-ON* */
    38 #endif
    39 
    40 /**
    41  *  \name Transparency definitions
    42  *  
    43  *  These define alpha as the opacity of a surface.
    44  */
    45 /*@{*/
    46 #define SDL_ALPHA_OPAQUE 255
    47 #define SDL_ALPHA_TRANSPARENT 0
    48 /*@}*/
    49 
    50 /** Pixel type. */
    51 enum
    52 {
    53     SDL_PIXELTYPE_UNKNOWN,
    54     SDL_PIXELTYPE_INDEX1,
    55     SDL_PIXELTYPE_INDEX4,
    56     SDL_PIXELTYPE_INDEX8,
    57     SDL_PIXELTYPE_PACKED8,
    58     SDL_PIXELTYPE_PACKED16,
    59     SDL_PIXELTYPE_PACKED32,
    60     SDL_PIXELTYPE_ARRAYU8,
    61     SDL_PIXELTYPE_ARRAYU16,
    62     SDL_PIXELTYPE_ARRAYU32,
    63     SDL_PIXELTYPE_ARRAYF16,
    64     SDL_PIXELTYPE_ARRAYF32
    65 };
    66 
    67 /** Bitmap pixel order, high bit -> low bit. */
    68 enum
    69 {
    70     SDL_BITMAPORDER_NONE,
    71     SDL_BITMAPORDER_4321,
    72     SDL_BITMAPORDER_1234
    73 };
    74 
    75 /** Packed component order, high bit -> low bit. */
    76 enum
    77 {
    78     SDL_PACKEDORDER_NONE,
    79     SDL_PACKEDORDER_XRGB,
    80     SDL_PACKEDORDER_RGBX,
    81     SDL_PACKEDORDER_ARGB,
    82     SDL_PACKEDORDER_RGBA,
    83     SDL_PACKEDORDER_XBGR,
    84     SDL_PACKEDORDER_BGRX,
    85     SDL_PACKEDORDER_ABGR,
    86     SDL_PACKEDORDER_BGRA
    87 };
    88 
    89 /** Array component order, low byte -> high byte. */
    90 enum
    91 {
    92     SDL_ARRAYORDER_NONE,
    93     SDL_ARRAYORDER_RGB,
    94     SDL_ARRAYORDER_RGBA,
    95     SDL_ARRAYORDER_ARGB,
    96     SDL_ARRAYORDER_BGR,
    97     SDL_ARRAYORDER_BGRA,
    98     SDL_ARRAYORDER_ABGR
    99 };
   100 
   101 /** Packed component layout. */
   102 enum
   103 {
   104     SDL_PACKEDLAYOUT_NONE,
   105     SDL_PACKEDLAYOUT_332,
   106     SDL_PACKEDLAYOUT_4444,
   107     SDL_PACKEDLAYOUT_1555,
   108     SDL_PACKEDLAYOUT_5551,
   109     SDL_PACKEDLAYOUT_565,
   110     SDL_PACKEDLAYOUT_8888,
   111     SDL_PACKEDLAYOUT_2101010,
   112     SDL_PACKEDLAYOUT_1010102
   113 };
   114 
   115 #define SDL_DEFINE_PIXELFOURCC(A, B, C, D) SDL_FOURCC(A, B, C, D)
   116 
   117 #define SDL_DEFINE_PIXELFORMAT(type, order, layout, bits, bytes) \
   118     ((1 << 31) | ((type) << 24) | ((order) << 20) | ((layout) << 16) | \
   119      ((bits) << 8) | ((bytes) << 0))
   120 
   121 #define SDL_PIXELTYPE(X)	(((X) >> 24) & 0x0F)
   122 #define SDL_PIXELORDER(X)	(((X) >> 20) & 0x0F)
   123 #define SDL_PIXELLAYOUT(X)	(((X) >> 16) & 0x0F)
   124 #define SDL_BITSPERPIXEL(X)	(((X) >> 8) & 0xFF)
   125 #define SDL_BYTESPERPIXEL(X) \
   126     (SDL_ISPIXELFORMAT_FOURCC(X) ? \
   127         ((((X) == SDL_PIXELFORMAT_YUY2) || \
   128           ((X) == SDL_PIXELFORMAT_UYVY) || \
   129           ((X) == SDL_PIXELFORMAT_YVYU)) ? 2 : 1) : (((X) >> 0) & 0xFF))
   130 
   131 #define SDL_ISPIXELFORMAT_INDEXED(format)   \
   132     (!SDL_ISPIXELFORMAT_FOURCC(format) && \
   133      ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX1) || \
   134       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX4) || \
   135       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX8)))
   136 
   137 #define SDL_ISPIXELFORMAT_ALPHA(format)   \
   138     (!SDL_ISPIXELFORMAT_FOURCC(format) && \
   139      ((SDL_PIXELORDER(format) == SDL_PACKEDORDER_ARGB) || \
   140       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_RGBA) || \
   141       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_ABGR) || \
   142       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_BGRA)))
   143 
   144 #define SDL_ISPIXELFORMAT_FOURCC(format)    \
   145     ((format) && !((format) & 0x80000000))
   146 
   147 /* Note: If you modify this list, update SDL_GetPixelFormatName() */
   148 enum
   149 {
   150     SDL_PIXELFORMAT_UNKNOWN,
   151     SDL_PIXELFORMAT_INDEX1LSB =
   152         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_4321, 0,
   153                                1, 0),
   154     SDL_PIXELFORMAT_INDEX1MSB =
   155         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_1234, 0,
   156                                1, 0),
   157     SDL_PIXELFORMAT_INDEX4LSB =
   158         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_4321, 0,
   159                                4, 0),
   160     SDL_PIXELFORMAT_INDEX4MSB =
   161         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_1234, 0,
   162                                4, 0),
   163     SDL_PIXELFORMAT_INDEX8 =
   164         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX8, 0, 0, 8, 1),
   165     SDL_PIXELFORMAT_RGB332 =
   166         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED8, SDL_PACKEDORDER_XRGB,
   167                                SDL_PACKEDLAYOUT_332, 8, 1),
   168     SDL_PIXELFORMAT_RGB444 =
   169         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
   170                                SDL_PACKEDLAYOUT_4444, 12, 2),
   171     SDL_PIXELFORMAT_RGB555 =
   172         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
   173                                SDL_PACKEDLAYOUT_1555, 15, 2),
   174     SDL_PIXELFORMAT_BGR555 =
   175         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR,
   176                                SDL_PACKEDLAYOUT_1555, 15, 2),
   177     SDL_PIXELFORMAT_ARGB4444 =
   178         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
   179                                SDL_PACKEDLAYOUT_4444, 16, 2),
   180     SDL_PIXELFORMAT_RGBA4444 =
   181         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_RGBA,
   182                                SDL_PACKEDLAYOUT_4444, 16, 2),
   183     SDL_PIXELFORMAT_ABGR4444 =
   184         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR,
   185                                SDL_PACKEDLAYOUT_4444, 16, 2),
   186     SDL_PIXELFORMAT_BGRA4444 =
   187         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_BGRA,
   188                                SDL_PACKEDLAYOUT_4444, 16, 2),
   189     SDL_PIXELFORMAT_ARGB1555 =
   190         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
   191                                SDL_PACKEDLAYOUT_1555, 16, 2),
   192     SDL_PIXELFORMAT_RGBA5551 =
   193         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_RGBA,
   194                                SDL_PACKEDLAYOUT_5551, 16, 2),
   195     SDL_PIXELFORMAT_ABGR1555 =
   196         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR,
   197                                SDL_PACKEDLAYOUT_1555, 16, 2),
   198     SDL_PIXELFORMAT_BGRA5551 =
   199         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_BGRA,
   200                                SDL_PACKEDLAYOUT_5551, 16, 2),
   201     SDL_PIXELFORMAT_RGB565 =
   202         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
   203                                SDL_PACKEDLAYOUT_565, 16, 2),
   204     SDL_PIXELFORMAT_BGR565 =
   205         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR,
   206                                SDL_PACKEDLAYOUT_565, 16, 2),
   207     SDL_PIXELFORMAT_RGB24 =
   208         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_RGB, 0,
   209                                24, 3),
   210     SDL_PIXELFORMAT_BGR24 =
   211         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_BGR, 0,
   212                                24, 3),
   213     SDL_PIXELFORMAT_RGB888 =
   214         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XRGB,
   215                                SDL_PACKEDLAYOUT_8888, 24, 4),
   216     SDL_PIXELFORMAT_BGR888 =
   217         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XBGR,
   218                                SDL_PACKEDLAYOUT_8888, 24, 4),
   219     SDL_PIXELFORMAT_ARGB8888 =
   220         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
   221                                SDL_PACKEDLAYOUT_8888, 32, 4),
   222     SDL_PIXELFORMAT_RGBA8888 =
   223         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_RGBA,
   224                                SDL_PACKEDLAYOUT_8888, 32, 4),
   225     SDL_PIXELFORMAT_ABGR8888 =
   226         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ABGR,
   227                                SDL_PACKEDLAYOUT_8888, 32, 4),
   228     SDL_PIXELFORMAT_BGRA8888 =
   229         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_BGRA,
   230                                SDL_PACKEDLAYOUT_8888, 32, 4),
   231     SDL_PIXELFORMAT_ARGB2101010 =
   232         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
   233                                SDL_PACKEDLAYOUT_2101010, 32, 4),
   234 
   235     SDL_PIXELFORMAT_YV12 =      /**< Planar mode: Y + V + U  (3 planes) */
   236         SDL_DEFINE_PIXELFOURCC('Y', 'V', '1', '2'),
   237     SDL_PIXELFORMAT_IYUV =      /**< Planar mode: Y + U + V  (3 planes) */
   238         SDL_DEFINE_PIXELFOURCC('I', 'Y', 'U', 'V'),
   239     SDL_PIXELFORMAT_YUY2 =      /**< Packed mode: Y0+U0+Y1+V0 (1 plane) */
   240         SDL_DEFINE_PIXELFOURCC('Y', 'U', 'Y', '2'),
   241     SDL_PIXELFORMAT_UYVY =      /**< Packed mode: U0+Y0+V0+Y1 (1 plane) */
   242         SDL_DEFINE_PIXELFOURCC('U', 'Y', 'V', 'Y'),
   243     SDL_PIXELFORMAT_YVYU =      /**< Packed mode: Y0+V0+Y1+U0 (1 plane) */
   244         SDL_DEFINE_PIXELFOURCC('Y', 'V', 'Y', 'U')
   245 };
   246 
   247 typedef struct SDL_Color
   248 {
   249     Uint8 r;
   250     Uint8 g;
   251     Uint8 b;
   252     Uint8 unused;
   253 } SDL_Color;
   254 #define SDL_Colour SDL_Color
   255 
   256 typedef struct SDL_Palette
   257 {
   258     int ncolors;
   259     SDL_Color *colors;
   260     Uint32 version;
   261     int refcount;
   262 } SDL_Palette;
   263 
   264 /**
   265  *  \note Everything in the pixel format structure is read-only.
   266  */
   267 typedef struct SDL_PixelFormat
   268 {
   269     Uint32 format;
   270     SDL_Palette *palette;
   271     Uint8 BitsPerPixel;
   272     Uint8 BytesPerPixel;
   273     Uint8 padding[2];
   274     Uint32 Rmask;
   275     Uint32 Gmask;
   276     Uint32 Bmask;
   277     Uint32 Amask;
   278     Uint8 Rloss;
   279     Uint8 Gloss;
   280     Uint8 Bloss;
   281     Uint8 Aloss;
   282     Uint8 Rshift;
   283     Uint8 Gshift;
   284     Uint8 Bshift;
   285     Uint8 Ashift;
   286     int refcount;
   287     struct SDL_PixelFormat *next;
   288 } SDL_PixelFormat;
   289 
   290 /**
   291  * \brief Get the human readable name of a pixel format
   292  */
   293 extern DECLSPEC const char* SDLCALL SDL_GetPixelFormatName(Uint32 format);
   294 
   295 /**
   296  *  \brief Convert one of the enumerated pixel formats to a bpp and RGBA masks.
   297  *  
   298  *  \return SDL_TRUE, or SDL_FALSE if the conversion wasn't possible.
   299  *  
   300  *  \sa SDL_MasksToPixelFormatEnum()
   301  */
   302 extern DECLSPEC SDL_bool SDLCALL SDL_PixelFormatEnumToMasks(Uint32 format,
   303                                                             int *bpp,
   304                                                             Uint32 * Rmask,
   305                                                             Uint32 * Gmask,
   306                                                             Uint32 * Bmask,
   307                                                             Uint32 * Amask);
   308 
   309 /**
   310  *  \brief Convert a bpp and RGBA masks to an enumerated pixel format.
   311  *  
   312  *  \return The pixel format, or ::SDL_PIXELFORMAT_UNKNOWN if the conversion 
   313  *          wasn't possible.
   314  *  
   315  *  \sa SDL_PixelFormatEnumToMasks()
   316  */
   317 extern DECLSPEC Uint32 SDLCALL SDL_MasksToPixelFormatEnum(int bpp,
   318                                                           Uint32 Rmask,
   319                                                           Uint32 Gmask,
   320                                                           Uint32 Bmask,
   321                                                           Uint32 Amask);
   322 
   323 /**
   324  *  \brief Create an SDL_PixelFormat structure from a pixel format enum.
   325  */
   326 extern DECLSPEC SDL_PixelFormat * SDLCALL SDL_AllocFormat(Uint32 pixel_format);
   327 
   328 /**
   329  *  \brief Free an SDL_PixelFormat structure.
   330  */
   331 extern DECLSPEC void SDLCALL SDL_FreeFormat(SDL_PixelFormat *format);
   332 
   333 /**
   334  *  \brief Create a palette structure with the specified number of color 
   335  *         entries.
   336  *  
   337  *  \return A new palette, or NULL if there wasn't enough memory.
   338  *  
   339  *  \note The palette entries are initialized to white.
   340  *  
   341  *  \sa SDL_FreePalette()
   342  */
   343 extern DECLSPEC SDL_Palette *SDLCALL SDL_AllocPalette(int ncolors);
   344 
   345 /**
   346  *  \brief Set the palette for a pixel format structure.
   347  */
   348 extern DECLSPEC int SDLCALL SDL_SetPixelFormatPalette(SDL_PixelFormat * format,
   349                                                       SDL_Palette *palette);
   350 
   351 /**
   352  *  \brief Set a range of colors in a palette.
   353  *  
   354  *  \param palette    The palette to modify.
   355  *  \param colors     An array of colors to copy into the palette.
   356  *  \param firstcolor The index of the first palette entry to modify.
   357  *  \param ncolors    The number of entries to modify.
   358  *  
   359  *  \return 0 on success, or -1 if not all of the colors could be set.
   360  */
   361 extern DECLSPEC int SDLCALL SDL_SetPaletteColors(SDL_Palette * palette,
   362                                                  const SDL_Color * colors,
   363                                                  int firstcolor, int ncolors);
   364 
   365 /**
   366  *  \brief Free a palette created with SDL_AllocPalette().
   367  *  
   368  *  \sa SDL_AllocPalette()
   369  */
   370 extern DECLSPEC void SDLCALL SDL_FreePalette(SDL_Palette * palette);
   371 
   372 /**
   373  *  \brief Maps an RGB triple to an opaque pixel value for a given pixel format.
   374  *  
   375  *  \sa SDL_MapRGBA
   376  */
   377 extern DECLSPEC Uint32 SDLCALL SDL_MapRGB(const SDL_PixelFormat * format,
   378                                           Uint8 r, Uint8 g, Uint8 b);
   379 
   380 /**
   381  *  \brief Maps an RGBA quadruple to a pixel value for a given pixel format.
   382  *  
   383  *  \sa SDL_MapRGB
   384  */
   385 extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(const SDL_PixelFormat * format,
   386                                            Uint8 r, Uint8 g, Uint8 b,
   387                                            Uint8 a);
   388 
   389 /**
   390  *  \brief Get the RGB components from a pixel of the specified format.
   391  *  
   392  *  \sa SDL_GetRGBA
   393  */
   394 extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel,
   395                                         const SDL_PixelFormat * format,
   396                                         Uint8 * r, Uint8 * g, Uint8 * b);
   397 
   398 /**
   399  *  \brief Get the RGBA components from a pixel of the specified format.
   400  *  
   401  *  \sa SDL_GetRGB
   402  */
   403 extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel,
   404                                          const SDL_PixelFormat * format,
   405                                          Uint8 * r, Uint8 * g, Uint8 * b,
   406                                          Uint8 * a);
   407 
   408 /**
   409  *  \brief Calculate a 256 entry gamma ramp for a gamma value.
   410  */
   411 extern DECLSPEC void SDLCALL SDL_CalculateGammaRamp(float gamma, Uint16 * ramp);
   412 
   413 
   414 /* Ends C function definitions when using C++ */
   415 #ifdef __cplusplus
   416 /* *INDENT-OFF* */
   417 }
   418 /* *INDENT-ON* */
   419 #endif
   420 #include "close_code.h"
   421 
   422 #endif /* _SDL_pixels_h */
   423 
   424 /* vi: set ts=4 sw=4 expandtab: */