Mercurial > sdl-ios-xcode
view include/SDL_surface.h @ 3491:1192adfc6d52
Add error messages for failure cases
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 25 Nov 2009 06:00:00 +0000 |
parents | 147d6ef5be03 |
children | 0267b8b1595c |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 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_surface.h * * Header file for ::SDL_surface definition and management functions. */ #ifndef _SDL_surface_h #define _SDL_surface_h #include "SDL_stdinc.h" #include "SDL_pixels.h" #include "SDL_rect.h" #include "SDL_rwops.h" #include "begin_code.h" /* Set up for C function definitions, even when using C++ */ #ifdef __cplusplus /* *INDENT-OFF* */ extern "C" { /* *INDENT-ON* */ #endif /** * \name Surface flags * * These are the currently supported flags for the ::SDL_surface. * * \internal * Used internally (read-only). */ /*@{*/ #define SDL_PREALLOC 0x00000001 /**< Surface uses preallocated memory */ #define SDL_RLEACCEL 0x00000002 /**< Surface is RLE encoded */ /*@}*//*Surface flags*/ /** * Evaluates to true if the surface needs to be locked before access. */ #define SDL_MUSTLOCK(S) (((S)->flags & SDL_RLEACCEL) != 0) /** * \brief A collection of pixels used in software blitting. * * \note This structure should be treated as read-only, except for \c pixels, * which, if not NULL, contains the raw pixel data for the surface. */ typedef struct SDL_Surface { Uint32 flags; /**< Read-only */ SDL_PixelFormat *format; /**< Read-only */ int w, h; /**< Read-only */ int pitch; /**< Read-only */ void *pixels; /**< Read-write */ /** Application data associated with the surfade */ void *userdata; /**< Read-write */ /** information needed for surfaces requiring locks */ int locked; /**< Read-only */ void *lock_data; /**< Read-only */ /** clipping information */ SDL_Rect clip_rect; /**< Read-only */ /** info for fast blit mapping to other surfaces */ struct SDL_BlitMap *map; /**< Private */ /** format version, bumped at every change to invalidate blit maps */ unsigned int format_version; /**< Private */ /** Reference count -- used when freeing surface */ int refcount; /**< Read-mostly */ } SDL_Surface; /** * \brief The type of function used for surface blitting functions. */ typedef int (*SDL_blit) (struct SDL_Surface * src, SDL_Rect * srcrect, struct SDL_Surface * dst, SDL_Rect * dstrect); /** * Allocate and free an RGB surface (must be called after SDL_SetVideoMode). * * If the depth is 4 or 8 bits, an empty palette is allocated for the surface. * If the depth is greater than 8 bits, the pixel format is set using the * flags '[RGB]mask'. * * If the function runs out of memory, it will return NULL. * * \param flags The \c flags are obsolete and should be set to 0. */ extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurface (Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask); extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceFrom(void *pixels, int width, int height, int depth, int pitch, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask); extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface * surface); /** * \brief Set the palette used by a surface. * * \return 0, or -1 if the surface format doesn't use a palette. * * \note A single palette can be shared with many surfaces. */ extern DECLSPEC int SDLCALL SDL_SetSurfacePalette(SDL_Surface * surface, SDL_Palette * palette); /** * \brief Sets up a surface for directly accessing the pixels. * * Between calls to SDL_LockSurface() / SDL_UnlockSurface(), you can write * to and read from \c surface->pixels, using the pixel format stored in * \c surface->format. Once you are done accessing the surface, you should * use SDL_UnlockSurface() to release it. * * Not all surfaces require locking. If SDL_MUSTLOCK(surface) evaluates * to 0, then you can read and write to the surface at any time, and the * pixel format of the surface will not change. * * No operating system or library calls should be made between lock/unlock * pairs, as critical system locks may be held during this time. * * SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked. * * \sa SDL_UnlockSurface() */ extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface * surface); /** \sa SDL_LockSurface() */ extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface * surface); /** * Load a surface from a seekable SDL data source (memory or file). * * If \c freesrc is non-zero, the source will be closed after being read. * * The new surface should be freed with SDL_FreeSurface(). * * \return the new surface, or NULL if there was an error. */ extern DECLSPEC SDL_Surface *SDLCALL SDL_LoadBMP_RW(SDL_RWops * src, int freesrc); /** * Load a surface from a file. * * Convenience macro. */ #define SDL_LoadBMP(file) SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1) /** * Save a surface to a seekable SDL data source (memory or file). * * If \c freedst is non-zero, the source will be closed after being written. * * \return 0 if successful or -1 if there was an error. */ extern DECLSPEC int SDLCALL SDL_SaveBMP_RW (SDL_Surface * surface, SDL_RWops * dst, int freedst); /** * Save a surface to a file. * * Convenience macro. */ #define SDL_SaveBMP(surface, file) \ SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1) /** * \brief Sets the RLE acceleration hint for a surface. * * \return 0 on success, or -1 if the surface is not valid * * \note If RLE is enabled, colorkey and alpha blending blits are much faster, * but the surface must be locked before directly accessing the pixels. */ extern DECLSPEC int SDLCALL SDL_SetSurfaceRLE(SDL_Surface * surface, int flag); /** * \brief Sets the color key (transparent pixel) in a blittable surface. * * \param surface The surface to update * \param flag Non-zero to enable colorkey and 0 to disable colorkey * \param key The transparent pixel in the native surface format * * \return 0 on success, or -1 if the surface is not valid */ extern DECLSPEC int SDLCALL SDL_SetColorKey(SDL_Surface * surface, Uint32 flag, Uint32 key); /** * \brief Sets the color key (transparent pixel) in a blittable surface. * * \param surface The surface to update * \param key A pointer filled in with the transparent pixel in the native * surface format * * \return 0 on success, or -1 if the surface is not valid or colorkey is not * enabled. */ extern DECLSPEC int SDLCALL SDL_GetColorKey(SDL_Surface * surface, Uint32 * key); /** * \brief Set an additional color value used in blit operations. * * \param surface The surface to update. * \param r The red source color value multiplied into blit operations. * \param g The green source color value multiplied into blit operations. * \param b The blue source color value multiplied into blit operations. * * \return 0 on success, or -1 if the surface is not valid. * * \sa SDL_GetSurfaceColorMod() */ extern DECLSPEC int SDLCALL SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b); /** * \brief Get the additional color value used in blit operations. * * \param surface The surface to query. * \param r A pointer filled in with the source red color value. * \param g A pointer filled in with the source green color value. * \param b A pointer filled in with the source blue color value. * * \return 0 on success, or -1 if the surface is not valid. * * \sa SDL_SetSurfaceColorMod() */ extern DECLSPEC int SDLCALL SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b); /** * \brief Set an additional alpha value used in blit operations. * * \param surface The surface to update. * \param alpha The source alpha value multiplied into blit operations. * * \return 0 on success, or -1 if the surface is not valid. * * \sa SDL_GetSurfaceAlphaMod() */ extern DECLSPEC int SDLCALL SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha); /** * \brief Get the additional alpha value used in blit operations. * * \param surface The surface to query. * \param alpha A pointer filled in with the source alpha value. * * \return 0 on success, or -1 if the surface is not valid. * * \sa SDL_SetSurfaceAlphaMod() */ extern DECLSPEC int SDLCALL SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha); /** * \brief Set the blend mode used for blit operations. * * \param surface The surface to update. * \param blendMode ::SDL_BlendMode to use for blit blending. * * \return 0 on success, or -1 if the parameters are not valid. * * \sa SDL_GetSurfaceBlendMode() */ extern DECLSPEC int SDLCALL SDL_SetSurfaceBlendMode(SDL_Surface * surface, int blendMode); /** * \brief Get the blend mode used for blit operations. * * \param surface The surface to query. * \param blendMode A pointer filled in with the current blend mode. * * \return 0 on success, or -1 if the surface is not valid. * * \sa SDL_SetSurfaceBlendMode() */ extern DECLSPEC int SDLCALL SDL_GetSurfaceBlendMode(SDL_Surface * surface, int *blendMode); /** * \brief Set the scale mode used for blit operations. * * \param surface The surface to update. * \param scaleMode ::SDL_TextureScaleMode to use for blit scaling. * * \return 0 on success, or -1 if the surface is not valid or the scale mode is * not supported. * * \note If the scale mode is not supported, the closest supported mode is * chosen. Currently only ::SDL_TEXTURESCALEMODE_FAST is supported on * surfaces. * * \sa SDL_GetSurfaceScaleMode() */ extern DECLSPEC int SDLCALL SDL_SetSurfaceScaleMode(SDL_Surface * surface, int scaleMode); /** * \brief Get the scale mode used for blit operations. * * \param surface The surface to query. * \param scaleMode A pointer filled in with the current scale mode. * * \return 0 on success, or -1 if the surface is not valid. * * \sa SDL_SetSurfaceScaleMode() */ extern DECLSPEC int SDLCALL SDL_GetSurfaceScaleMode(SDL_Surface * surface, int *scaleMode); /** * Sets the clipping rectangle for the destination surface in a blit. * * If the clip rectangle is NULL, clipping will be disabled. * * If the clip rectangle doesn't intersect the surface, the function will * return SDL_FALSE and blits will be completely clipped. Otherwise the * function returns SDL_TRUE and blits to the surface will be clipped to * the intersection of the surface area and the clipping rectangle. * * Note that blits are automatically clipped to the edges of the source * and destination surfaces. */ extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface * surface, const SDL_Rect * rect); /** * Gets the clipping rectangle for the destination surface in a blit. * * \c rect must be a pointer to a valid rectangle which will be filled * with the correct values. */ extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface, SDL_Rect * rect); /** * Creates a new surface of the specified format, and then copies and maps * the given surface to it so the blit of the converted surface will be as * fast as possible. If this function fails, it returns NULL. * * The \c flags parameter is passed to SDL_CreateRGBSurface() and has those * semantics. You can also pass ::SDL_RLEACCEL in the flags parameter and * SDL will try to RLE accelerate colorkey and alpha blits in the resulting * surface. * * This function is used internally by SDL_DisplayFormat(). */ extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface (SDL_Surface * src, SDL_PixelFormat * fmt, Uint32 flags); /** * \brief Copy a block of pixels of one format to another format */ extern DECLSPEC int SDLCALL SDL_ConvertPixels(int width, int height, Uint32 src_format, const void * src, int src_pitch, Uint32 dst_format, void * dst, int dst_pitch); /** * Draws a point with \c color. * * The color should be a pixel of the format used by the surface, and * can be generated by the SDL_MapRGB() function. * * \return 0 on success, or -1 on error. */ extern DECLSPEC int SDLCALL SDL_DrawPoint (SDL_Surface * dst, int x, int y, Uint32 color); /** * Blends a point with an RGBA value. * * The color should be a pixel of the format used by the surface, and * can be generated by the SDL_MapRGB() function. * * \return 0 on success, or -1 on error. */ extern DECLSPEC int SDLCALL SDL_BlendPoint (SDL_Surface * dst, int x, int y, int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); /** * Draws a line with \c color. * * The color should be a pixel of the format used by the surface, and * can be generated by the SDL_MapRGB() function. * * \return 0 on success, or -1 on error. */ extern DECLSPEC int SDLCALL SDL_DrawLine (SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color); /** * Blends an RGBA value along a line. * * \return 0 on success, or -1 on error. */ extern DECLSPEC int SDLCALL SDL_BlendLine (SDL_Surface * dst, int x1, int y1, int x2, int y2, int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); /** * Performs a fast fill of the given rectangle with \c color. * * The given rectangle is clipped to the destination surface clip area * and the final fill rectangle is saved in the passed in pointer. * * If \c dstrect is NULL, the whole surface will be filled with \c color. * * The color should be a pixel of the format used by the surface, and * can be generated by the SDL_MapRGB() function. * * \return 0 on success, or -1 on error. */ extern DECLSPEC int SDLCALL SDL_FillRect (SDL_Surface * dst, SDL_Rect * dstrect, Uint32 color); /** * Blends an RGBA value into the given rectangle. * * The given rectangle is clipped to the destination surface clip area * and the final fill rectangle is saved in the passed in pointer. * * If \c dstrect is NULL, the whole surface will be filled with \c color. * * \return This function returns 0 on success, or -1 on error. */ extern DECLSPEC int SDLCALL SDL_BlendRect (SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); /** * Performs a fast blit from the source surface to the destination surface. * * This assumes that the source and destination rectangles are * the same size. If either \c srcrect or \c dstrect are NULL, the entire * surface (\c src or \c dst) is copied. The final blit rectangles are saved * in \c srcrect and \c dstrect after all clipping is performed. * * \return If the blit is successful, it returns 0, otherwise it returns -1. * * The blit function should not be called on a locked surface. * * The blit semantics for surfaces with and without alpha and colorkey * are defined as follows: * \verbatim RGBA->RGB: SDL_SRCALPHA set: alpha-blend (using alpha-channel). SDL_SRCCOLORKEY ignored. SDL_SRCALPHA not set: copy RGB. if SDL_SRCCOLORKEY set, only copy the pixels matching the RGB values of the source colour key, ignoring alpha in the comparison. RGB->RGBA: SDL_SRCALPHA set: alpha-blend (using the source per-surface alpha value); set destination alpha to opaque. SDL_SRCALPHA not set: copy RGB, set destination alpha to source per-surface alpha value. both: if SDL_SRCCOLORKEY set, only copy the pixels matching the source colour key. RGBA->RGBA: SDL_SRCALPHA set: alpha-blend (using the source alpha channel) the RGB values; leave destination alpha untouched. [Note: is this correct?] SDL_SRCCOLORKEY ignored. SDL_SRCALPHA not set: copy all of RGBA to the destination. if SDL_SRCCOLORKEY set, only copy the pixels matching the RGB values of the source colour key, ignoring alpha in the comparison. RGB->RGB: SDL_SRCALPHA set: alpha-blend (using the source per-surface alpha value). SDL_SRCALPHA not set: copy RGB. both: if SDL_SRCCOLORKEY set, only copy the pixels matching the source colour key. \endverbatim * * If either of the surfaces were in video memory, and the blit returns -2, * the video memory was lost, so it should be reloaded with artwork and * re-blitted: * @code * while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) { * while ( SDL_LockSurface(image) < 0 ) * Sleep(10); * -- Write image pixels to image->pixels -- * SDL_UnlockSurface(image); * } * @endcode * * This happens under DirectX 5.0 when the system switches away from your * fullscreen application. The lock will also fail until you have access * to the video memory again. * * You should call SDL_BlitSurface() unless you know exactly how SDL * blitting works internally and how to use the other blit functions. */ #define SDL_BlitSurface SDL_UpperBlit /** * This is the public blit function, SDL_BlitSurface(), and it performs * rectangle validation and clipping before passing it to SDL_LowerBlit() */ extern DECLSPEC int SDLCALL SDL_UpperBlit (SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect); /** * This is a semi-private blit function and it performs low-level surface * blitting only. */ extern DECLSPEC int SDLCALL SDL_LowerBlit (SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect); /** * \brief Perform a fast, low quality, stretch blit between two surfaces of the * same pixel format. * * \note This function uses a static buffer, and is not thread-safe. */ extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src, const SDL_Rect * srcrect, SDL_Surface * dst, const SDL_Rect * dstrect); /* Ends C function definitions when using C++ */ #ifdef __cplusplus /* *INDENT-OFF* */ } /* *INDENT-ON* */ #endif #include "close_code.h" #endif /* _SDL_surface_h */ /* vi: set ts=4 sw=4 expandtab: */