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555 lines
20 KiB
C
555 lines
20 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_surface.h
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*
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* Header file for ::SDL_Surface definition and management functions.
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*/
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#ifndef SDL_surface_h_
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#define SDL_surface_h_
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#include "SDL_stdinc.h"
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#include "SDL_pixels.h"
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#include "SDL_rect.h"
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#include "SDL_blendmode.h"
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#include "SDL_rwops.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \name Surface flags
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*
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* These are the currently supported flags for the ::SDL_Surface.
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*
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* \internal
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* Used internally (read-only).
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*/
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/* @{ */
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#define SDL_SWSURFACE 0 /**< Just here for compatibility */
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#define SDL_PREALLOC 0x00000001 /**< Surface uses preallocated memory */
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#define SDL_RLEACCEL 0x00000002 /**< Surface is RLE encoded */
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#define SDL_DONTFREE 0x00000004 /**< Surface is referenced internally */
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#define SDL_SIMD_ALIGNED 0x00000008 /**< Surface uses aligned memory */
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/* @} *//* Surface flags */
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/**
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* Evaluates to true if the surface needs to be locked before access.
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*/
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#define SDL_MUSTLOCK(S) (((S)->flags & SDL_RLEACCEL) != 0)
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/**
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* \brief A collection of pixels used in software blitting.
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*
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* \note This structure should be treated as read-only, except for \c pixels,
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* which, if not NULL, contains the raw pixel data for the surface.
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*/
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typedef struct SDL_Surface
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{
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Uint32 flags; /**< Read-only */
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SDL_PixelFormat *format; /**< Read-only */
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int w, h; /**< Read-only */
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int pitch; /**< Read-only */
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void *pixels; /**< Read-write */
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/** Application data associated with the surface */
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void *userdata; /**< Read-write */
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/** information needed for surfaces requiring locks */
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int locked; /**< Read-only */
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void *lock_data; /**< Read-only */
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/** clipping information */
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SDL_Rect clip_rect; /**< Read-only */
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/** info for fast blit mapping to other surfaces */
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struct SDL_BlitMap *map; /**< Private */
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/** Reference count -- used when freeing surface */
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int refcount; /**< Read-mostly */
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} SDL_Surface;
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/**
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* \brief The type of function used for surface blitting functions.
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*/
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typedef int (SDLCALL *SDL_blit) (struct SDL_Surface * src, SDL_Rect * srcrect,
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struct SDL_Surface * dst, SDL_Rect * dstrect);
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/**
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* \brief The formula used for converting between YUV and RGB
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*/
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typedef enum
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{
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SDL_YUV_CONVERSION_JPEG, /**< Full range JPEG */
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SDL_YUV_CONVERSION_BT601, /**< BT.601 (the default) */
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SDL_YUV_CONVERSION_BT709, /**< BT.709 */
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SDL_YUV_CONVERSION_AUTOMATIC /**< BT.601 for SD content, BT.709 for HD content */
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} SDL_YUV_CONVERSION_MODE;
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/**
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* Allocate and free an RGB surface.
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*
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* If the depth is 4 or 8 bits, an empty palette is allocated for the surface.
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* If the depth is greater than 8 bits, the pixel format is set using the
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* flags '[RGB]mask'.
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*
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* If the function runs out of memory, it will return NULL.
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*
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* \param flags The \c flags are obsolete and should be set to 0.
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* \param width The width in pixels of the surface to create.
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* \param height The height in pixels of the surface to create.
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* \param depth The depth in bits of the surface to create.
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* \param Rmask The red mask of the surface to create.
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* \param Gmask The green mask of the surface to create.
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* \param Bmask The blue mask of the surface to create.
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* \param Amask The alpha mask of the surface to create.
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*/
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extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurface
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(Uint32 flags, int width, int height, int depth,
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Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
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/* !!! FIXME for 2.1: why does this ask for depth? Format provides that. */
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extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceWithFormat
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(Uint32 flags, int width, int height, int depth, Uint32 format);
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extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceFrom(void *pixels,
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int width,
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int height,
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int depth,
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int pitch,
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Uint32 Rmask,
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Uint32 Gmask,
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Uint32 Bmask,
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Uint32 Amask);
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extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceWithFormatFrom
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(void *pixels, int width, int height, int depth, int pitch, Uint32 format);
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extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface * surface);
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/**
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* \brief Set the palette used by a surface.
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*
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* \return 0, or -1 if the surface format doesn't use a palette.
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*
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* \note A single palette can be shared with many surfaces.
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*/
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extern DECLSPEC int SDLCALL SDL_SetSurfacePalette(SDL_Surface * surface,
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SDL_Palette * palette);
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/**
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* \brief Sets up a surface for directly accessing the pixels.
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*
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* Between calls to SDL_LockSurface() / SDL_UnlockSurface(), you can write
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* to and read from \c surface->pixels, using the pixel format stored in
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* \c surface->format. Once you are done accessing the surface, you should
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* use SDL_UnlockSurface() to release it.
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*
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* Not all surfaces require locking. If SDL_MUSTLOCK(surface) evaluates
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* to 0, then you can read and write to the surface at any time, and the
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* pixel format of the surface will not change.
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*
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* No operating system or library calls should be made between lock/unlock
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* pairs, as critical system locks may be held during this time.
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*
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* SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked.
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*
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* \sa SDL_UnlockSurface()
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*/
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extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface * surface);
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/** \sa SDL_LockSurface() */
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extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface * surface);
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/**
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* Load a surface from a seekable SDL data stream (memory or file).
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*
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* If \c freesrc is non-zero, the stream will be closed after being read.
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*
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* The new surface should be freed with SDL_FreeSurface().
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*
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* \return the new surface, or NULL if there was an error.
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*/
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extern DECLSPEC SDL_Surface *SDLCALL SDL_LoadBMP_RW(SDL_RWops * src,
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int freesrc);
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/**
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* Load a surface from a file.
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*
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* Convenience macro.
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*/
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#define SDL_LoadBMP(file) SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1)
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/**
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* Save a surface to a seekable SDL data stream (memory or file).
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*
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* Surfaces with a 24-bit, 32-bit and paletted 8-bit format get saved in the
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* BMP directly. Other RGB formats with 8-bit or higher get converted to a
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* 24-bit surface or, if they have an alpha mask or a colorkey, to a 32-bit
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* surface before they are saved. YUV and paletted 1-bit and 4-bit formats are
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* not supported.
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*
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* If \c freedst is non-zero, the stream will be closed after being written.
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*
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* \return 0 if successful or -1 if there was an error.
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*/
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extern DECLSPEC int SDLCALL SDL_SaveBMP_RW
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(SDL_Surface * surface, SDL_RWops * dst, int freedst);
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/**
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* Save a surface to a file.
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*
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* Convenience macro.
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*/
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#define SDL_SaveBMP(surface, file) \
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SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)
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/**
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* \brief Sets the RLE acceleration hint for a surface.
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*
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* \return 0 on success, or -1 if the surface is not valid
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*
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* \note If RLE is enabled, colorkey and alpha blending blits are much faster,
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* but the surface must be locked before directly accessing the pixels.
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*/
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extern DECLSPEC int SDLCALL SDL_SetSurfaceRLE(SDL_Surface * surface,
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int flag);
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/**
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* \brief Sets the color key (transparent pixel) in a blittable surface.
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*
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* \param surface The surface to update
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* \param flag Non-zero to enable colorkey and 0 to disable colorkey
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* \param key The transparent pixel in the native surface format
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*
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* \return 0 on success, or -1 if the surface is not valid
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*
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* You can pass SDL_RLEACCEL to enable RLE accelerated blits.
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*/
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extern DECLSPEC int SDLCALL SDL_SetColorKey(SDL_Surface * surface,
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int flag, Uint32 key);
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/**
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* \brief Returns whether the surface has a color key
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*
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* \return SDL_TRUE if the surface has a color key, or SDL_FALSE if the surface is NULL or has no color key
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasColorKey(SDL_Surface * surface);
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/**
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* \brief Gets the color key (transparent pixel) in a blittable surface.
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*
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* \param surface The surface to update
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* \param key A pointer filled in with the transparent pixel in the native
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* surface format
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*
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* \return 0 on success, or -1 if the surface is not valid or colorkey is not
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* enabled.
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*/
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extern DECLSPEC int SDLCALL SDL_GetColorKey(SDL_Surface * surface,
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Uint32 * key);
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/**
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* \brief Set an additional color value used in blit operations.
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*
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* \param surface The surface to update.
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* \param r The red color value multiplied into blit operations.
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* \param g The green color value multiplied into blit operations.
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* \param b The blue color value multiplied into blit operations.
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*
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* \return 0 on success, or -1 if the surface is not valid.
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*
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* \sa SDL_GetSurfaceColorMod()
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*/
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extern DECLSPEC int SDLCALL SDL_SetSurfaceColorMod(SDL_Surface * surface,
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Uint8 r, Uint8 g, Uint8 b);
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/**
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* \brief Get the additional color value used in blit operations.
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*
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* \param surface The surface to query.
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* \param r A pointer filled in with the current red color value.
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* \param g A pointer filled in with the current green color value.
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* \param b A pointer filled in with the current blue color value.
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*
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* \return 0 on success, or -1 if the surface is not valid.
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*
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* \sa SDL_SetSurfaceColorMod()
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*/
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extern DECLSPEC int SDLCALL SDL_GetSurfaceColorMod(SDL_Surface * surface,
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Uint8 * r, Uint8 * g,
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Uint8 * b);
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/**
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* \brief Set an additional alpha value used in blit operations.
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*
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* \param surface The surface to update.
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* \param alpha The alpha value multiplied into blit operations.
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*
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* \return 0 on success, or -1 if the surface is not valid.
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*
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* \sa SDL_GetSurfaceAlphaMod()
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*/
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extern DECLSPEC int SDLCALL SDL_SetSurfaceAlphaMod(SDL_Surface * surface,
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Uint8 alpha);
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/**
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* \brief Get the additional alpha value used in blit operations.
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*
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* \param surface The surface to query.
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* \param alpha A pointer filled in with the current alpha value.
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*
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* \return 0 on success, or -1 if the surface is not valid.
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*
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* \sa SDL_SetSurfaceAlphaMod()
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*/
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extern DECLSPEC int SDLCALL SDL_GetSurfaceAlphaMod(SDL_Surface * surface,
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Uint8 * alpha);
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/**
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* \brief Set the blend mode used for blit operations.
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*
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* \param surface The surface to update.
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* \param blendMode ::SDL_BlendMode to use for blit blending.
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*
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* \return 0 on success, or -1 if the parameters are not valid.
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*
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* \sa SDL_GetSurfaceBlendMode()
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*/
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extern DECLSPEC int SDLCALL SDL_SetSurfaceBlendMode(SDL_Surface * surface,
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SDL_BlendMode blendMode);
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/**
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* \brief Get the blend mode used for blit operations.
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*
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* \param surface The surface to query.
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* \param blendMode A pointer filled in with the current blend mode.
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*
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* \return 0 on success, or -1 if the surface is not valid.
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*
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* \sa SDL_SetSurfaceBlendMode()
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*/
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extern DECLSPEC int SDLCALL SDL_GetSurfaceBlendMode(SDL_Surface * surface,
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SDL_BlendMode *blendMode);
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/**
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* Sets the clipping rectangle for the destination surface in a blit.
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*
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* If the clip rectangle is NULL, clipping will be disabled.
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*
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* If the clip rectangle doesn't intersect the surface, the function will
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* return SDL_FALSE and blits will be completely clipped. Otherwise the
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* function returns SDL_TRUE and blits to the surface will be clipped to
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* the intersection of the surface area and the clipping rectangle.
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*
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* Note that blits are automatically clipped to the edges of the source
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* and destination surfaces.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface * surface,
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const SDL_Rect * rect);
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/**
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* Gets the clipping rectangle for the destination surface in a blit.
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*
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* \c rect must be a pointer to a valid rectangle which will be filled
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* with the correct values.
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*/
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extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface,
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SDL_Rect * rect);
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/*
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* Creates a new surface identical to the existing surface
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*/
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extern DECLSPEC SDL_Surface *SDLCALL SDL_DuplicateSurface(SDL_Surface * surface);
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/**
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* Creates a new surface of the specified format, and then copies and maps
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* the given surface to it so the blit of the converted surface will be as
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* fast as possible. If this function fails, it returns NULL.
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*
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* The \c flags parameter is passed to SDL_CreateRGBSurface() and has those
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* semantics. You can also pass ::SDL_RLEACCEL in the flags parameter and
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* SDL will try to RLE accelerate colorkey and alpha blits in the resulting
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* surface.
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*/
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extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface
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(SDL_Surface * src, const SDL_PixelFormat * fmt, Uint32 flags);
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extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurfaceFormat
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(SDL_Surface * src, Uint32 pixel_format, Uint32 flags);
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/**
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* \brief Copy a block of pixels of one format to another format
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*
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* \return 0 on success, or -1 if there was an error
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*/
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extern DECLSPEC int SDLCALL SDL_ConvertPixels(int width, int height,
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Uint32 src_format,
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const void * src, int src_pitch,
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Uint32 dst_format,
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void * dst, int dst_pitch);
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/**
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* Performs a fast fill of the given rectangle with \c color.
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*
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* If \c rect is NULL, the whole surface will be filled with \c color.
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*
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* The color should be a pixel of the format used by the surface, and
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* can be generated by the SDL_MapRGB() function.
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*
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* \return 0 on success, or -1 on error.
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*/
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extern DECLSPEC int SDLCALL SDL_FillRect
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(SDL_Surface * dst, const SDL_Rect * rect, Uint32 color);
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extern DECLSPEC int SDLCALL SDL_FillRects
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(SDL_Surface * dst, const SDL_Rect * rects, int count, Uint32 color);
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/**
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* Performs a fast blit from the source surface to the destination surface.
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*
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* This assumes that the source and destination rectangles are
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* the same size. If either \c srcrect or \c dstrect are NULL, the entire
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* surface (\c src or \c dst) is copied. The final blit rectangles are saved
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* in \c srcrect and \c dstrect after all clipping is performed.
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*
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* \return If the blit is successful, it returns 0, otherwise it returns -1.
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*
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* The blit function should not be called on a locked surface.
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*
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* The blit semantics for surfaces with and without blending and colorkey
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* are defined as follows:
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* \verbatim
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RGBA->RGB:
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Source surface blend mode set to SDL_BLENDMODE_BLEND:
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alpha-blend (using the source alpha-channel and per-surface alpha)
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SDL_SRCCOLORKEY ignored.
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Source surface blend mode set to SDL_BLENDMODE_NONE:
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copy RGB.
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if SDL_SRCCOLORKEY set, only copy the pixels matching the
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RGB values of the source color key, ignoring alpha in the
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comparison.
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RGB->RGBA:
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Source surface blend mode set to SDL_BLENDMODE_BLEND:
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alpha-blend (using the source per-surface alpha)
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Source surface blend mode set to SDL_BLENDMODE_NONE:
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copy RGB, set destination alpha to source per-surface alpha value.
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both:
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if SDL_SRCCOLORKEY set, only copy the pixels matching the
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source color key.
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RGBA->RGBA:
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Source surface blend mode set to SDL_BLENDMODE_BLEND:
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alpha-blend (using the source alpha-channel and per-surface alpha)
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SDL_SRCCOLORKEY ignored.
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Source surface blend mode set to SDL_BLENDMODE_NONE:
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copy all of RGBA to the destination.
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if SDL_SRCCOLORKEY set, only copy the pixels matching the
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RGB values of the source color key, ignoring alpha in the
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comparison.
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RGB->RGB:
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Source surface blend mode set to SDL_BLENDMODE_BLEND:
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alpha-blend (using the source per-surface alpha)
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Source surface blend mode set to SDL_BLENDMODE_NONE:
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copy RGB.
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both:
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if SDL_SRCCOLORKEY set, only copy the pixels matching the
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source color key.
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\endverbatim
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*
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* You should call SDL_BlitSurface() unless you know exactly how SDL
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* blitting works internally and how to use the other blit functions.
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*/
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#define SDL_BlitSurface SDL_UpperBlit
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/**
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* This is the public blit function, SDL_BlitSurface(), and it performs
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* rectangle validation and clipping before passing it to SDL_LowerBlit()
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*/
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extern DECLSPEC int SDLCALL SDL_UpperBlit
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(SDL_Surface * src, const SDL_Rect * srcrect,
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SDL_Surface * dst, SDL_Rect * dstrect);
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/**
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* This is a semi-private blit function and it performs low-level surface
|
|
* blitting only.
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|
*/
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|
extern DECLSPEC int SDLCALL SDL_LowerBlit
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|
(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);
|
|
|
|
#define SDL_BlitScaled SDL_UpperBlitScaled
|
|
|
|
/**
|
|
* This is the public scaled blit function, SDL_BlitScaled(), and it performs
|
|
* rectangle validation and clipping before passing it to SDL_LowerBlitScaled()
|
|
*/
|
|
extern DECLSPEC int SDLCALL SDL_UpperBlitScaled
|
|
(SDL_Surface * src, const SDL_Rect * srcrect,
|
|
SDL_Surface * dst, SDL_Rect * dstrect);
|
|
|
|
/**
|
|
* This is a semi-private blit function and it performs low-level surface
|
|
* scaled blitting only.
|
|
*/
|
|
extern DECLSPEC int SDLCALL SDL_LowerBlitScaled
|
|
(SDL_Surface * src, SDL_Rect * srcrect,
|
|
SDL_Surface * dst, SDL_Rect * dstrect);
|
|
|
|
/**
|
|
* \brief Set the YUV conversion mode
|
|
*/
|
|
extern DECLSPEC void SDLCALL SDL_SetYUVConversionMode(SDL_YUV_CONVERSION_MODE mode);
|
|
|
|
/**
|
|
* \brief Get the YUV conversion mode
|
|
*/
|
|
extern DECLSPEC SDL_YUV_CONVERSION_MODE SDLCALL SDL_GetYUVConversionMode(void);
|
|
|
|
/**
|
|
* \brief Get the YUV conversion mode, returning the correct mode for the resolution when the current conversion mode is SDL_YUV_CONVERSION_AUTOMATIC
|
|
*/
|
|
extern DECLSPEC SDL_YUV_CONVERSION_MODE SDLCALL SDL_GetYUVConversionModeForResolution(int width, int height);
|
|
|
|
/* Ends C function definitions when using C++ */
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#include "close_code.h"
|
|
|
|
#endif /* SDL_surface_h_ */
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|