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Diffstat (limited to 'dependencies/SDL/SDL_pixels.h')
| -rw-r--r-- | dependencies/SDL/SDL_pixels.h | 644 |
1 files changed, 644 insertions, 0 deletions
diff --git a/dependencies/SDL/SDL_pixels.h b/dependencies/SDL/SDL_pixels.h new file mode 100644 index 0000000..5d2c0c8 --- /dev/null +++ b/dependencies/SDL/SDL_pixels.h @@ -0,0 +1,644 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org> + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/** + * \file SDL_pixels.h + * + * Header for the enumerated pixel format definitions. + */ + +#ifndef SDL_pixels_h_ +#define SDL_pixels_h_ + +#include "SDL_stdinc.h" +#include "SDL_endian.h" + +#include "begin_code.h" +/* Set up for C function definitions, even when using C++ */ +#ifdef __cplusplus +extern "C" { +#endif + +/** + * \name Transparency definitions + * + * These define alpha as the opacity of a surface. + */ +/* @{ */ +#define SDL_ALPHA_OPAQUE 255 +#define SDL_ALPHA_TRANSPARENT 0 +/* @} */ + +/** Pixel type. */ +typedef enum +{ + 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 +} SDL_PixelType; + +/** Bitmap pixel order, high bit -> low bit. */ +typedef enum +{ + SDL_BITMAPORDER_NONE, + SDL_BITMAPORDER_4321, + SDL_BITMAPORDER_1234 +} SDL_BitmapOrder; + +/** Packed component order, high bit -> low bit. */ +typedef enum +{ + 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 +} SDL_PackedOrder; + +/** Array component order, low byte -> high byte. */ +/* !!! FIXME: in 2.1, make these not overlap differently with + !!! FIXME: SDL_PACKEDORDER_*, so we can simplify SDL_ISPIXELFORMAT_ALPHA */ +typedef enum +{ + SDL_ARRAYORDER_NONE, + SDL_ARRAYORDER_RGB, + SDL_ARRAYORDER_RGBA, + SDL_ARRAYORDER_ARGB, + SDL_ARRAYORDER_BGR, + SDL_ARRAYORDER_BGRA, + SDL_ARRAYORDER_ABGR +} SDL_ArrayOrder; + +/** Packed component layout. */ +typedef enum +{ + 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 +} SDL_PackedLayout; + +#define SDL_DEFINE_PIXELFOURCC(A, B, C, D) SDL_FOURCC(A, B, C, D) + +#define SDL_DEFINE_PIXELFORMAT(type, order, layout, bits, bytes) \ + ((1 << 28) | ((type) << 24) | ((order) << 20) | ((layout) << 16) | \ + ((bits) << 8) | ((bytes) << 0)) + +#define SDL_PIXELFLAG(X) (((X) >> 28) & 0x0F) +#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) \ + (SDL_ISPIXELFORMAT_FOURCC(X) ? \ + ((((X) == SDL_PIXELFORMAT_YUY2) || \ + ((X) == SDL_PIXELFORMAT_UYVY) || \ + ((X) == SDL_PIXELFORMAT_YVYU)) ? 2 : 1) : (((X) >> 0) & 0xFF)) + +#define SDL_ISPIXELFORMAT_INDEXED(format) \ + (!SDL_ISPIXELFORMAT_FOURCC(format) && \ + ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX1) || \ + (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX4) || \ + (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX8))) + +#define SDL_ISPIXELFORMAT_PACKED(format) \ + (!SDL_ISPIXELFORMAT_FOURCC(format) && \ + ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_PACKED8) || \ + (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_PACKED16) || \ + (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_PACKED32))) + +#define SDL_ISPIXELFORMAT_ARRAY(format) \ + (!SDL_ISPIXELFORMAT_FOURCC(format) && \ + ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYU8) || \ + (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYU16) || \ + (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYU32) || \ + (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYF16) || \ + (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYF32))) + +#define SDL_ISPIXELFORMAT_ALPHA(format) \ + ((SDL_ISPIXELFORMAT_PACKED(format) && \ + ((SDL_PIXELORDER(format) == SDL_PACKEDORDER_ARGB) || \ + (SDL_PIXELORDER(format) == SDL_PACKEDORDER_RGBA) || \ + (SDL_PIXELORDER(format) == SDL_PACKEDORDER_ABGR) || \ + (SDL_PIXELORDER(format) == SDL_PACKEDORDER_BGRA))) || \ + (SDL_ISPIXELFORMAT_ARRAY(format) && \ + ((SDL_PIXELORDER(format) == SDL_ARRAYORDER_ARGB) || \ + (SDL_PIXELORDER(format) == SDL_ARRAYORDER_RGBA) || \ + (SDL_PIXELORDER(format) == SDL_ARRAYORDER_ABGR) || \ + (SDL_PIXELORDER(format) == SDL_ARRAYORDER_BGRA)))) + +/* The flag is set to 1 because 0x1? is not in the printable ASCII range */ +#define SDL_ISPIXELFORMAT_FOURCC(format) \ + ((format) && (SDL_PIXELFLAG(format) != 1)) + +/* Note: If you modify this list, update SDL_GetPixelFormatName() */ +typedef enum +{ + SDL_PIXELFORMAT_UNKNOWN, + SDL_PIXELFORMAT_INDEX1LSB = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_4321, 0, + 1, 0), + SDL_PIXELFORMAT_INDEX1MSB = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_1234, 0, + 1, 0), + SDL_PIXELFORMAT_INDEX4LSB = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_4321, 0, + 4, 0), + SDL_PIXELFORMAT_INDEX4MSB = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_1234, 0, + 4, 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_XRGB4444 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB, + SDL_PACKEDLAYOUT_4444, 12, 2), + SDL_PIXELFORMAT_RGB444 = SDL_PIXELFORMAT_XRGB4444, + SDL_PIXELFORMAT_XBGR4444 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR, + SDL_PACKEDLAYOUT_4444, 12, 2), + SDL_PIXELFORMAT_BGR444 = SDL_PIXELFORMAT_XBGR4444, + SDL_PIXELFORMAT_XRGB1555 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB, + SDL_PACKEDLAYOUT_1555, 15, 2), + SDL_PIXELFORMAT_RGB555 = SDL_PIXELFORMAT_XRGB1555, + SDL_PIXELFORMAT_XBGR1555 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR, + SDL_PACKEDLAYOUT_1555, 15, 2), + SDL_PIXELFORMAT_BGR555 = SDL_PIXELFORMAT_XBGR1555, + SDL_PIXELFORMAT_ARGB4444 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB, + SDL_PACKEDLAYOUT_4444, 16, 2), + SDL_PIXELFORMAT_RGBA4444 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_RGBA, + SDL_PACKEDLAYOUT_4444, 16, 2), + SDL_PIXELFORMAT_ABGR4444 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR, + SDL_PACKEDLAYOUT_4444, 16, 2), + SDL_PIXELFORMAT_BGRA4444 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_BGRA, + SDL_PACKEDLAYOUT_4444, 16, 2), + SDL_PIXELFORMAT_ARGB1555 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB, + SDL_PACKEDLAYOUT_1555, 16, 2), + SDL_PIXELFORMAT_RGBA5551 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_RGBA, + SDL_PACKEDLAYOUT_5551, 16, 2), + SDL_PIXELFORMAT_ABGR1555 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR, + SDL_PACKEDLAYOUT_1555, 16, 2), + SDL_PIXELFORMAT_BGRA5551 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_BGRA, + SDL_PACKEDLAYOUT_5551, 16, 2), + SDL_PIXELFORMAT_RGB565 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB, + SDL_PACKEDLAYOUT_565, 16, 2), + SDL_PIXELFORMAT_BGR565 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR, + 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_XRGB8888 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XRGB, + SDL_PACKEDLAYOUT_8888, 24, 4), + SDL_PIXELFORMAT_RGB888 = SDL_PIXELFORMAT_XRGB8888, + SDL_PIXELFORMAT_RGBX8888 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_RGBX, + SDL_PACKEDLAYOUT_8888, 24, 4), + SDL_PIXELFORMAT_XBGR8888 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XBGR, + SDL_PACKEDLAYOUT_8888, 24, 4), + SDL_PIXELFORMAT_BGR888 = SDL_PIXELFORMAT_XBGR8888, + SDL_PIXELFORMAT_BGRX8888 = + SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_BGRX, + 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), + + /* Aliases for RGBA byte arrays of color data, for the current platform */ +#if SDL_BYTEORDER == SDL_BIG_ENDIAN + SDL_PIXELFORMAT_RGBA32 = SDL_PIXELFORMAT_RGBA8888, + SDL_PIXELFORMAT_ARGB32 = SDL_PIXELFORMAT_ARGB8888, + SDL_PIXELFORMAT_BGRA32 = SDL_PIXELFORMAT_BGRA8888, + SDL_PIXELFORMAT_ABGR32 = SDL_PIXELFORMAT_ABGR8888, +#else + SDL_PIXELFORMAT_RGBA32 = SDL_PIXELFORMAT_ABGR8888, + SDL_PIXELFORMAT_ARGB32 = SDL_PIXELFORMAT_BGRA8888, + SDL_PIXELFORMAT_BGRA32 = SDL_PIXELFORMAT_ARGB8888, + SDL_PIXELFORMAT_ABGR32 = SDL_PIXELFORMAT_RGBA8888, +#endif + + 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'), + SDL_PIXELFORMAT_NV12 = /**< Planar mode: Y + U/V interleaved (2 planes) */ + SDL_DEFINE_PIXELFOURCC('N', 'V', '1', '2'), + SDL_PIXELFORMAT_NV21 = /**< Planar mode: Y + V/U interleaved (2 planes) */ + SDL_DEFINE_PIXELFOURCC('N', 'V', '2', '1'), + SDL_PIXELFORMAT_EXTERNAL_OES = /**< Android video texture format */ + SDL_DEFINE_PIXELFOURCC('O', 'E', 'S', ' ') +} SDL_PixelFormatEnum; + +/** + * The bits of this structure can be directly reinterpreted as an integer-packed + * color which uses the SDL_PIXELFORMAT_RGBA32 format (SDL_PIXELFORMAT_ABGR8888 + * on little-endian systems and SDL_PIXELFORMAT_RGBA8888 on big-endian systems). + */ +typedef struct SDL_Color +{ + Uint8 r; + Uint8 g; + Uint8 b; + Uint8 a; +} SDL_Color; +#define SDL_Colour SDL_Color + +typedef struct SDL_Palette +{ + int ncolors; + SDL_Color *colors; + Uint32 version; + int refcount; +} SDL_Palette; + +/** + * \note Everything in the pixel format structure is read-only. + */ +typedef struct SDL_PixelFormat +{ + Uint32 format; + SDL_Palette *palette; + Uint8 BitsPerPixel; + Uint8 BytesPerPixel; + Uint8 padding[2]; + Uint32 Rmask; + Uint32 Gmask; + Uint32 Bmask; + Uint32 Amask; + Uint8 Rloss; + Uint8 Gloss; + Uint8 Bloss; + Uint8 Aloss; + Uint8 Rshift; + Uint8 Gshift; + Uint8 Bshift; + Uint8 Ashift; + int refcount; + struct SDL_PixelFormat *next; +} SDL_PixelFormat; + +/** + * Get the human readable name of a pixel format. + * + * \param format the pixel format to query + * \returns the human readable name of the specified pixel format or + * `SDL_PIXELFORMAT_UNKNOWN` if the format isn't recognized. + * + * \since This function is available since SDL 2.0.0. + */ +extern DECLSPEC const char* SDLCALL SDL_GetPixelFormatName(Uint32 format); + +/** + * Convert one of the enumerated pixel formats to a bpp value and RGBA masks. + * + * \param format one of the SDL_PixelFormatEnum values + * \param bpp a bits per pixel value; usually 15, 16, or 32 + * \param Rmask a pointer filled in with the red mask for the format + * \param Gmask a pointer filled in with the green mask for the format + * \param Bmask a pointer filled in with the blue mask for the format + * \param Amask a pointer filled in with the alpha mask for the format + * \returns SDL_TRUE on success or SDL_FALSE if the conversion wasn't + * possible; call SDL_GetError() for more information. + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_MasksToPixelFormatEnum + */ +extern DECLSPEC SDL_bool SDLCALL SDL_PixelFormatEnumToMasks(Uint32 format, + int *bpp, + Uint32 * Rmask, + Uint32 * Gmask, + Uint32 * Bmask, + Uint32 * Amask); + +/** + * Convert a bpp value and RGBA masks to an enumerated pixel format. + * + * This will return `SDL_PIXELFORMAT_UNKNOWN` if the conversion wasn't + * possible. + * + * \param bpp a bits per pixel value; usually 15, 16, or 32 + * \param Rmask the red mask for the format + * \param Gmask the green mask for the format + * \param Bmask the blue mask for the format + * \param Amask the alpha mask for the format + * \returns one of the SDL_PixelFormatEnum values + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_PixelFormatEnumToMasks + */ +extern DECLSPEC Uint32 SDLCALL SDL_MasksToPixelFormatEnum(int bpp, + Uint32 Rmask, + Uint32 Gmask, + Uint32 Bmask, + Uint32 Amask); + +/** + * Create an SDL_PixelFormat structure corresponding to a pixel format. + * + * Returned structure may come from a shared global cache (i.e. not newly + * allocated), and hence should not be modified, especially the palette. Weird + * errors such as `Blit combination not supported` may occur. + * + * \param pixel_format one of the SDL_PixelFormatEnum values + * \returns the new SDL_PixelFormat structure or NULL on failure; call + * SDL_GetError() for more information. + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_FreeFormat + */ +extern DECLSPEC SDL_PixelFormat * SDLCALL SDL_AllocFormat(Uint32 pixel_format); + +/** + * Free an SDL_PixelFormat structure allocated by SDL_AllocFormat(). + * + * \param format the SDL_PixelFormat structure to free + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_AllocFormat + */ +extern DECLSPEC void SDLCALL SDL_FreeFormat(SDL_PixelFormat *format); + +/** + * Create a palette structure with the specified number of color entries. + * + * The palette entries are initialized to white. + * + * \param ncolors represents the number of color entries in the color palette + * \returns a new SDL_Palette structure on success or NULL on failure (e.g. if + * there wasn't enough memory); call SDL_GetError() for more + * information. + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_FreePalette + */ +extern DECLSPEC SDL_Palette *SDLCALL SDL_AllocPalette(int ncolors); + +/** + * Set the palette for a pixel format structure. + * + * \param format the SDL_PixelFormat structure that will use the palette + * \param palette the SDL_Palette structure that will be used + * \returns 0 on success or a negative error code on failure; call + * SDL_GetError() for more information. + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_AllocPalette + * \sa SDL_FreePalette + */ +extern DECLSPEC int SDLCALL SDL_SetPixelFormatPalette(SDL_PixelFormat * format, + SDL_Palette *palette); + +/** + * Set a range of colors in a palette. + * + * \param palette the SDL_Palette structure to modify + * \param colors an array of SDL_Color structures to copy into the palette + * \param firstcolor the index of the first palette entry to modify + * \param ncolors the number of entries to modify + * \returns 0 on success or a negative error code if not all of the colors + * could be set; call SDL_GetError() for more information. + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_AllocPalette + * \sa SDL_CreateRGBSurface + */ +extern DECLSPEC int SDLCALL SDL_SetPaletteColors(SDL_Palette * palette, + const SDL_Color * colors, + int firstcolor, int ncolors); + +/** + * Free a palette created with SDL_AllocPalette(). + * + * \param palette the SDL_Palette structure to be freed + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_AllocPalette + */ +extern DECLSPEC void SDLCALL SDL_FreePalette(SDL_Palette * palette); + +/** + * Map an RGB triple to an opaque pixel value for a given pixel format. + * + * This function maps the RGB color value to the specified pixel format and + * returns the pixel value best approximating the given RGB color value for + * the given pixel format. + * + * 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). + * + * 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). + * + * \param format an SDL_PixelFormat structure describing the pixel format + * \param r the red component of the pixel in the range 0-255 + * \param g the green component of the pixel in the range 0-255 + * \param b the blue component of the pixel in the range 0-255 + * \returns a pixel value + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_GetRGB + * \sa SDL_GetRGBA + * \sa SDL_MapRGBA + */ +extern DECLSPEC Uint32 SDLCALL SDL_MapRGB(const SDL_PixelFormat * format, + Uint8 r, Uint8 g, Uint8 b); + +/** + * Map an RGBA quadruple to a pixel value for a given pixel format. + * + * This function maps the RGBA color value to the specified pixel format and + * returns the pixel value best approximating the given RGBA color value for + * the given pixel format. + * + * If the specified pixel format has no alpha component the alpha value will + * be ignored (as it will be in formats with a palette). + * + * If the format has a palette (8-bit) the index of the closest matching color + * in the palette will be returned. + * + * 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). + * + * \param format an SDL_PixelFormat structure describing the format of the + * pixel + * \param r the red component of the pixel in the range 0-255 + * \param g the green component of the pixel in the range 0-255 + * \param b the blue component of the pixel in the range 0-255 + * \param a the alpha component of the pixel in the range 0-255 + * \returns a pixel value + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_GetRGB + * \sa SDL_GetRGBA + * \sa SDL_MapRGB + */ +extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(const SDL_PixelFormat * format, + Uint8 r, Uint8 g, Uint8 b, + Uint8 a); + +/** + * Get RGB values from a pixel in the specified format. + * + * 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]). + * + * \param pixel a pixel value + * \param format an SDL_PixelFormat structure describing the format of the + * pixel + * \param r a pointer filled in with the red component + * \param g a pointer filled in with the green component + * \param b a pointer filled in with the blue component + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_GetRGBA + * \sa SDL_MapRGB + * \sa SDL_MapRGBA + */ +extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel, + const SDL_PixelFormat * format, + Uint8 * r, Uint8 * g, Uint8 * b); + +/** + * Get RGBA values from a pixel in the specified format. + * + * 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]). + * + * If the surface has no alpha component, the alpha will be returned as 0xff + * (100% opaque). + * + * \param pixel a pixel value + * \param format an SDL_PixelFormat structure describing the format of the + * pixel + * \param r a pointer filled in with the red component + * \param g a pointer filled in with the green component + * \param b a pointer filled in with the blue component + * \param a a pointer filled in with the alpha component + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_GetRGB + * \sa SDL_MapRGB + * \sa SDL_MapRGBA + */ +extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel, + const SDL_PixelFormat * format, + Uint8 * r, Uint8 * g, Uint8 * b, + Uint8 * a); + +/** + * Calculate a 256 entry gamma ramp for a gamma value. + * + * \param gamma a gamma value where 0.0 is black and 1.0 is identity + * \param ramp an array of 256 values filled in with the gamma ramp + * + * \since This function is available since SDL 2.0.0. + * + * \sa SDL_SetWindowGammaRamp + */ +extern DECLSPEC void SDLCALL SDL_CalculateGammaRamp(float gamma, Uint16 * ramp); + + +/* Ends C function definitions when using C++ */ +#ifdef __cplusplus +} +#endif +#include "close_code.h" + +#endif /* SDL_pixels_h_ */ + +/* vi: set ts=4 sw=4 expandtab: */ |