dolphin/Externals/SDL/Include_1.3/SDL_surface.h
2010-06-16 01:14:18 +00:00

534 lines
20 KiB
C

/*
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
/* These are the currently supported flags for the SDL_surface */
/* Used internally (read-only) */
#define SDL_PREALLOC 0x00000001 /* Surface uses preallocated memory */
#define SDL_RLEACCEL 0x00000002 /* Surface is RLE encoded */
/* Evaluates to true if the surface needs to be locked before access */
#define SDL_MUSTLOCK(S) (((S)->flags & SDL_RLEACCEL) != 0)
/**
* \struct SDL_Surface
*
* \brief A collection of pixels used in software blitting
*
* \note This structure should be treated as read-only, except for '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;
/**
* \typedef SDL_blit
*
* \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.
*
* The '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);
/**
* \fn int SDL_SetSurfacePalette(SDL_Surface *surface, SDL_Palette *palette)
*
* \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);
/*
* SDL_LockSurface() sets up a surface for directly accessing the pixels.
* Between calls to SDL_LockSurface()/SDL_UnlockSurface(), you can write
* to and read from 'surface->pixels', using the pixel format stored in
* '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.
*/
extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface * surface);
extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface * surface);
/*
* Load a surface from a seekable SDL data source (memory or file.)
* If 'freesrc' is non-zero, the source will be closed after being read.
* Returns the new surface, or NULL if there was an error.
* The new surface should be freed with SDL_FreeSurface().
*/
extern DECLSPEC SDL_Surface *SDLCALL SDL_LoadBMP_RW(SDL_RWops * src,
int freesrc);
/* Convenience macro -- load a surface from a file */
#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 'freedst' is non-zero, the source will be closed after being written.
* Returns 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);
/* Convenience macro -- save a surface to a file */
#define SDL_SaveBMP(surface, file) \
SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)
/*
* \fn int SDL_SetSurfaceRLE(SDL_Surface *surface, int flag)
*
* \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);
/*
* \fn int 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 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);
/**
* \fn int SDL_SetSurfaceColorMod(SDL_Surface *surface, Uint8 r, Uint8 g, Uint8 b)
*
* \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);
/**
* \fn int SDL_GetSurfaceColorMod(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);
/**
* \fn int SDL_SetSurfaceAlphaMod(SDL_Surface *surface, Uint8 alpha)
*
* \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);
/**
* \fn int SDL_GetSurfaceAlphaMod(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);
/**
* \fn int SDL_SetSurfaceBlendMode(SDL_Surface *surface, int blendMode)
*
* \brief Set the blend mode used for blit operations
*
* \param surface The surface to update
* \param blendMode SDL_TextureBlendMode 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);
/**
* \fn int SDL_GetSurfaceBlendMode(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);
/**
* \fn int SDL_SetSurfaceScaleMode(SDL_Surface *surface, int scaleMode)
*
* \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);
/**
* \fn int SDL_GetSurfaceScaleMode(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.
* '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 '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);
/*
* This function draws a point with 'color'
* The color should be a pixel of the format used by the surface, and
* can be generated by the SDL_MapRGB() function.
* This function returns 0 on success, or -1 on error.
*/
extern DECLSPEC int SDLCALL SDL_DrawPoint
(SDL_Surface * dst, int x, int y, Uint32 color);
/*
* This function 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.
* This function returns 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);
/*
* This function draws a line with 'color'
* The color should be a pixel of the format used by the surface, and
* can be generated by the SDL_MapRGB() function.
* This function returns 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);
/*
* This function blends an RGBA value along a line
* This function returns 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);
/*
* This function performs a fast fill of the given rectangle with '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 'dstrect' is NULL, the whole surface will be filled with 'color'
* The color should be a pixel of the format used by the surface, and
* can be generated by the SDL_MapRGB() function.
* This function returns 0 on success, or -1 on error.
*/
extern DECLSPEC int SDLCALL SDL_FillRect
(SDL_Surface * dst, SDL_Rect * dstrect, Uint32 color);
/*
* This function 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 'dstrect' is NULL, the whole surface will be filled with 'color'
* 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);
/*
* This performs a fast blit from the source surface to the destination
* surface. It assumes that the source and destination rectangles are
* the same size. If either 'srcrect' or 'dstrect' are NULL, the entire
* surface (src or dst) is copied. The final blit rectangles are saved
* in 'srcrect' and 'dstrect' after all clipping is performed.
* 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:
*
* 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.
*
* 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:
while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
while ( SDL_LockSurface(image) < 0 )
Sleep(10);
-- Write image pixels to image->pixels --
SDL_UnlockSurface(image);
}
* 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);
/**
* \fn int SDL_SoftStretch(SDL_Surface * src, const SDL_Rect * srcrect, SDL_Surface * dst, const 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 */
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