| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2010 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 surface */ |
| 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. |
| * |
| * 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, |
| int flag, Uint32 key); |
| |
| /** |
| * \brief Gets 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. |
| */ |
| 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); |
| extern DECLSPEC int SDLCALL SDL_DrawPoints |
| (SDL_Surface * dst, const SDL_Point * points, int count, Uint32 color); |
| |
| /** |
| * Blends a point with an RGBA value. |
| * |
| * \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); |
| extern DECLSPEC int SDLCALL SDL_BlendPoints |
| (SDL_Surface * dst, const SDL_Point * points, int count, |
| 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); |
| extern DECLSPEC int SDLCALL SDL_DrawLines |
| (SDL_Surface * dst, const SDL_Point * points, int count, 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); |
| extern DECLSPEC int SDLCALL SDL_BlendLines |
| (SDL_Surface * dst, const SDL_Point * points, int count, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| |
| /** |
| * Draws the given rectangle with \c color. |
| * |
| * If \c rect is NULL, the whole surface will be outlined 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_DrawRect |
| (SDL_Surface * dst, const SDL_Rect * rect, Uint32 color); |
| extern DECLSPEC int SDLCALL SDL_DrawRects |
| (SDL_Surface * dst, const SDL_Rect ** rects, int count, Uint32 color); |
| |
| /** |
| * Blends an RGBA value into the outline of the given rectangle. |
| * |
| * If \c rect is NULL, the whole surface will have a blended outline. |
| * |
| * \return 0 on success, or -1 on error. |
| */ |
| extern DECLSPEC int SDLCALL SDL_BlendRect |
| (SDL_Surface * dst, const SDL_Rect * rect, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| extern DECLSPEC int SDLCALL SDL_BlendRects |
| (SDL_Surface * dst, const SDL_Rect ** rects, int count, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| |
| /** |
| * Performs a fast fill of the given rectangle with \c color. |
| * |
| * If \c rect 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, const SDL_Rect * rect, Uint32 color); |
| extern DECLSPEC int SDLCALL SDL_FillRects |
| (SDL_Surface * dst, const SDL_Rect ** rects, int count, Uint32 color); |
| |
| /** |
| * Blends an RGBA value into the given rectangle. |
| * |
| * If \c rect is NULL, the whole surface will be blended with the color. |
| * |
| * \return This function returns 0 on success, or -1 on error. |
| */ |
| extern DECLSPEC int SDLCALL SDL_BlendFillRect |
| (SDL_Surface * dst, const SDL_Rect * rect, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| extern DECLSPEC int SDLCALL SDL_BlendFillRects |
| (SDL_Surface * dst, const SDL_Rect ** rects, int count, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| |
| #if 0 |
| /** |
| * Draws the given circle 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_DrawCircle |
| (SDL_Surface * dst, int x, int y, int radius, Uint32 color); |
| |
| /** |
| * Blends an RGBA value into the outline of the given circle. |
| * |
| * \return 0 on success, or -1 on error. |
| */ |
| extern DECLSPEC int SDLCALL SDL_BlendCircle |
| (SDL_Surface * dst, int x, int y, int radius, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| |
| /** |
| * Fills the given circle 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_FillCircle |
| (SDL_Surface * dst, int x, int y, int radius, Uint32 color); |
| |
| /** |
| * Blends an RGBA value into the given circle. |
| * |
| * \return This function returns 0 on success, or -1 on error. |
| */ |
| extern DECLSPEC int SDLCALL SDL_BlendFillCircle |
| (SDL_Surface * dst, int x, int y, int radius, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| |
| /** |
| * Draws the given ellipse 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_DrawEllipse |
| (SDL_Surface * dst, int x, int y, int w, int h, Uint32 color); |
| |
| /** |
| * Blends an RGBA value into the outline of the given ellipse. |
| * |
| * \return 0 on success, or -1 on error. |
| */ |
| extern DECLSPEC int SDLCALL SDL_BlendEllipse |
| (SDL_Surface * dst, int x, int y, int w, int h, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| |
| /** |
| * Fills the given ellipse 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_FillEllipse |
| (SDL_Surface * dst, int x, int y, int w, int h, Uint32 color); |
| |
| /** |
| * Blends an RGBA value into the given ellipse. |
| * |
| * \return This function returns 0 on success, or -1 on error. |
| */ |
| extern DECLSPEC int SDLCALL SDL_BlendFillEllipse |
| (SDL_Surface * dst, int x, int y, int w, int h, |
| int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
| #endif // 0 |
| |
| /** |
| * 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: */ |
