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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/**
+ *  \file SDL_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_blendmode.h"
+#include "SDL_rwops.h"
+
+#include "begin_code.h"
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *  \name Surface flags
+ *
+ *  These are the currently supported flags for the ::SDL_Surface.
+ *
+ *  \internal
+ *  Used internally (read-only).
+ */
+/* @{ */
+#define SDL_SWSURFACE       0           /**< Just here for compatibility */
+#define SDL_PREALLOC        0x00000001  /**< Surface uses preallocated memory */
+#define SDL_RLEACCEL        0x00000002  /**< Surface is RLE encoded */
+#define SDL_DONTFREE        0x00000004  /**< Surface is referenced internally */
+#define SDL_SIMD_ALIGNED    0x00000008  /**< Surface uses aligned memory */
+/* @} *//* 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 */
+
+    /** list of BlitMap that hold a reference to this surface */
+    void *list_blitmap;         /**< Private */
+
+    /** clipping information */
+    SDL_Rect clip_rect;         /**< Read-only */
+
+    /** info for fast blit mapping to other surfaces */
+    struct SDL_BlitMap *map;    /**< 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 (SDLCALL *SDL_blit) (struct SDL_Surface * src, SDL_Rect * srcrect,
+                                 struct SDL_Surface * dst, SDL_Rect * dstrect);
+
+/**
+ * \brief The formula used for converting between YUV and RGB
+ */
+typedef enum
+{
+    SDL_YUV_CONVERSION_JPEG,        /**< Full range JPEG */
+    SDL_YUV_CONVERSION_BT601,       /**< BT.601 (the default) */
+    SDL_YUV_CONVERSION_BT709,       /**< BT.709 */
+    SDL_YUV_CONVERSION_AUTOMATIC    /**< BT.601 for SD content, BT.709 for HD content */
+} SDL_YUV_CONVERSION_MODE;
+
+/**
+ * Allocate a new RGB surface.
+ *
+ * If `depth` is 4 or 8 bits, an empty palette is allocated for the surface.
+ * If `depth` is greater than 8 bits, the pixel format is set using the
+ * [RGBA]mask parameters.
+ *
+ * The [RGBA]mask parameters are the bitmasks used to extract that color from
+ * a pixel. For instance, `Rmask` being 0xFF000000 means the red data is
+ * stored in the most significant byte. Using zeros for the RGB masks sets a
+ * default value, based on the depth. For example:
+ *
+ * ```c++
+ * SDL_CreateRGBSurface(0,w,h,32,0,0,0,0);
+ * ```
+ *
+ * However, using zero for the Amask results in an Amask of 0.
+ *
+ * By default surfaces with an alpha mask are set up for blending as with:
+ *
+ * ```c++
+ * SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND)
+ * ```
+ *
+ * You can change this by calling SDL_SetSurfaceBlendMode() and selecting a
+ * different `blendMode`.
+ *
+ * \param flags the flags are unused and should be set to 0
+ * \param width the width of the surface
+ * \param height the height of the surface
+ * \param depth the depth of the surface in bits
+ * \param Rmask the red mask for the pixels
+ * \param Gmask the green mask for the pixels
+ * \param Bmask the blue mask for the pixels
+ * \param Amask the alpha mask for the pixels
+ * \returns the new SDL_Surface structure that is created or NULL if it fails;
+ *          call SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_CreateRGBSurfaceFrom
+ * \sa SDL_CreateRGBSurfaceWithFormat
+ * \sa SDL_FreeSurface
+ */
+extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurface
+    (Uint32 flags, int width, int height, int depth,
+     Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
+
+
+/* !!! FIXME for 2.1: why does this ask for depth? Format provides that. */
+
+/**
+ * Allocate a new RGB surface with a specific pixel format.
+ *
+ * This function operates mostly like SDL_CreateRGBSurface(), except instead
+ * of providing pixel color masks, you provide it with a predefined format
+ * from SDL_PixelFormatEnum.
+ *
+ * \param flags the flags are unused and should be set to 0
+ * \param width the width of the surface
+ * \param height the height of the surface
+ * \param depth the depth of the surface in bits
+ * \param format the SDL_PixelFormatEnum for the new surface's pixel format.
+ * \returns the new SDL_Surface structure that is created or NULL if it fails;
+ *          call SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.5.
+ *
+ * \sa SDL_CreateRGBSurface
+ * \sa SDL_CreateRGBSurfaceFrom
+ * \sa SDL_FreeSurface
+ */
+extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceWithFormat
+    (Uint32 flags, int width, int height, int depth, Uint32 format);
+
+/**
+ * Allocate a new RGB surface with existing pixel data.
+ *
+ * This function operates mostly like SDL_CreateRGBSurface(), except it does
+ * not allocate memory for the pixel data, instead the caller provides an
+ * existing buffer of data for the surface to use.
+ *
+ * No copy is made of the pixel data. Pixel data is not managed automatically;
+ * you must free the surface before you free the pixel data.
+ *
+ * \param pixels a pointer to existing pixel data
+ * \param width the width of the surface
+ * \param height the height of the surface
+ * \param depth the depth of the surface in bits
+ * \param pitch the pitch of the surface in bytes
+ * \param Rmask the red mask for the pixels
+ * \param Gmask the green mask for the pixels
+ * \param Bmask the blue mask for the pixels
+ * \param Amask the alpha mask for the pixels
+ * \returns the new SDL_Surface structure that is created or NULL if it fails;
+ *          call SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_CreateRGBSurface
+ * \sa SDL_CreateRGBSurfaceWithFormat
+ * \sa SDL_FreeSurface
+ */
+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);
+
+/* !!! FIXME for 2.1: why does this ask for depth? Format provides that. */
+
+/**
+ * Allocate a new RGB surface with with a specific pixel format and existing
+ * pixel data.
+ *
+ * This function operates mostly like SDL_CreateRGBSurfaceFrom(), except
+ * instead of providing pixel color masks, you provide it with a predefined
+ * format from SDL_PixelFormatEnum.
+ *
+ * No copy is made of the pixel data. Pixel data is not managed automatically;
+ * you must free the surface before you free the pixel data.
+ *
+ * \param pixels a pointer to existing pixel data
+ * \param width the width of the surface
+ * \param height the height of the surface
+ * \param depth the depth of the surface in bits
+ * \param pitch the pitch of the surface in bytes
+ * \param format the SDL_PixelFormatEnum for the new surface's pixel format.
+ * \returns the new SDL_Surface structure that is created or NULL if it fails;
+ *          call SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.5.
+ *
+ * \sa SDL_CreateRGBSurfaceFrom
+ * \sa SDL_CreateRGBSurfaceWithFormat
+ * \sa SDL_FreeSurface
+ */
+extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceWithFormatFrom
+    (void *pixels, int width, int height, int depth, int pitch, Uint32 format);
+
+/**
+ * Free an RGB surface.
+ *
+ * It is safe to pass NULL to this function.
+ *
+ * \param surface the SDL_Surface to free.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_CreateRGBSurface
+ * \sa SDL_CreateRGBSurfaceFrom
+ * \sa SDL_LoadBMP
+ * \sa SDL_LoadBMP_RW
+ */
+extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface * surface);
+
+/**
+ * Set the palette used by a surface.
+ *
+ * A single palette can be shared with many surfaces.
+ *
+ * \param surface the SDL_Surface structure to update
+ * \param palette the SDL_Palette structure to use
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ */
+extern DECLSPEC int SDLCALL SDL_SetSurfacePalette(SDL_Surface * surface,
+                                                  SDL_Palette * palette);
+
+/**
+ * Set 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.
+ *
+ * \param surface the SDL_Surface structure to be locked
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_MUSTLOCK
+ * \sa SDL_UnlockSurface
+ */
+extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface * surface);
+
+/**
+ * Release a surface after directly accessing the pixels.
+ *
+ * \param surface the SDL_Surface structure to be unlocked
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_LockSurface
+ */
+extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface * surface);
+
+/**
+ * Load a BMP image from a seekable SDL data stream.
+ *
+ * The new surface should be freed with SDL_FreeSurface(). Not doing so will
+ * result in a memory leak.
+ *
+ * src is an open SDL_RWops buffer, typically loaded with SDL_RWFromFile.
+ * Alternitavely, you might also use the macro SDL_LoadBMP to load a bitmap
+ * from a file, convert it to an SDL_Surface and then close the file.
+ *
+ * \param src the data stream for the surface
+ * \param freesrc non-zero to close the stream after being read
+ * \returns a pointer to a new SDL_Surface structure or NULL if there was an
+ *          error; call SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_FreeSurface
+ * \sa SDL_RWFromFile
+ * \sa SDL_LoadBMP
+ * \sa SDL_SaveBMP_RW
+ */
+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 stream in BMP format.
+ *
+ * Surfaces with a 24-bit, 32-bit and paletted 8-bit format get saved in the
+ * BMP directly. Other RGB formats with 8-bit or higher get converted to a
+ * 24-bit surface or, if they have an alpha mask or a colorkey, to a 32-bit
+ * surface before they are saved. YUV and paletted 1-bit and 4-bit formats are
+ * not supported.
+ *
+ * \param surface the SDL_Surface structure containing the image to be saved
+ * \param dst a data stream to save to
+ * \param freedst non-zero to close the stream after being written
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_LoadBMP_RW
+ * \sa SDL_SaveBMP
+ */
+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)
+
+/**
+ * Set the RLE acceleration hint for a surface.
+ *
+ * If RLE is enabled, color key and alpha blending blits are much faster, but
+ * the surface must be locked before directly accessing the pixels.
+ *
+ * \param surface the SDL_Surface structure to optimize
+ * \param flag 0 to disable, non-zero to enable RLE acceleration
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitSurface
+ * \sa SDL_LockSurface
+ * \sa SDL_UnlockSurface
+ */
+extern DECLSPEC int SDLCALL SDL_SetSurfaceRLE(SDL_Surface * surface,
+                                              int flag);
+
+/**
+ * Returns whether the surface is RLE enabled
+ *
+ * It is safe to pass a NULL `surface` here; it will return SDL_FALSE.
+ *
+ * \param surface the SDL_Surface structure to query
+ * \returns SDL_TRUE if the surface is RLE enabled, SDL_FALSE otherwise.
+ *
+ * \since This function is available since SDL 2.0.14.
+ *
+ * \sa SDL_SetSurfaceRLE
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_HasSurfaceRLE(SDL_Surface * surface);
+
+/**
+ * Set the color key (transparent pixel) in a surface.
+ *
+ * The color key defines a pixel value that will be treated as transparent in
+ * a blit. For example, one can use this to specify that cyan pixels should be
+ * considered transparent, and therefore not rendered.
+ *
+ * It is a pixel of the format used by the surface, as generated by
+ * SDL_MapRGB().
+ *
+ * RLE acceleration can substantially speed up blitting of images with large
+ * horizontal runs of transparent pixels. See SDL_SetSurfaceRLE() for details.
+ *
+ * \param surface the SDL_Surface structure to update
+ * \param flag SDL_TRUE to enable color key, SDL_FALSE to disable color key
+ * \param key the transparent pixel
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitSurface
+ * \sa SDL_GetColorKey
+ */
+extern DECLSPEC int SDLCALL SDL_SetColorKey(SDL_Surface * surface,
+                                            int flag, Uint32 key);
+
+/**
+ * Returns whether the surface has a color key
+ *
+ * It is safe to pass a NULL `surface` here; it will return SDL_FALSE.
+ *
+ * \param surface the SDL_Surface structure to query
+ * \return SDL_TRUE if the surface has a color key, SDL_FALSE otherwise.
+ *
+ * \since This function is available since SDL 2.0.9.
+ *
+ * \sa SDL_SetColorKey
+ * \sa SDL_GetColorKey
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_HasColorKey(SDL_Surface * surface);
+
+/**
+ * Get the color key (transparent pixel) for a surface.
+ *
+ * The color key is a pixel of the format used by the surface, as generated by
+ * SDL_MapRGB().
+ *
+ * If the surface doesn't have color key enabled this function returns -1.
+ *
+ * \param surface the SDL_Surface structure to query
+ * \param key a pointer filled in with the transparent pixel
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitSurface
+ * \sa SDL_SetColorKey
+ */
+extern DECLSPEC int SDLCALL SDL_GetColorKey(SDL_Surface * surface,
+                                            Uint32 * key);
+
+/**
+ * Set an additional color value multiplied into blit operations.
+ *
+ * When this surface is blitted, during the blit operation each source color
+ * channel is modulated by the appropriate color value according to the
+ * following formula:
+ *
+ * `srcC = srcC * (color / 255)`
+ *
+ * \param surface the SDL_Surface structure to update
+ * \param r the red color value multiplied into blit operations
+ * \param g the green color value multiplied into blit operations
+ * \param b the blue color value multiplied into blit operations
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_GetSurfaceColorMod
+ * \sa SDL_SetSurfaceAlphaMod
+ */
+extern DECLSPEC int SDLCALL SDL_SetSurfaceColorMod(SDL_Surface * surface,
+                                                   Uint8 r, Uint8 g, Uint8 b);
+
+
+/**
+ * Get the additional color value multiplied into blit operations.
+ *
+ * \param surface the SDL_Surface structure to query
+ * \param r a pointer filled in with the current red color value
+ * \param g a pointer filled in with the current green color value
+ * \param b a pointer filled in with the current blue color value
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_GetSurfaceAlphaMod
+ * \sa SDL_SetSurfaceColorMod
+ */
+extern DECLSPEC int SDLCALL SDL_GetSurfaceColorMod(SDL_Surface * surface,
+                                                   Uint8 * r, Uint8 * g,
+                                                   Uint8 * b);
+
+/**
+ * Set an additional alpha value used in blit operations.
+ *
+ * When this surface is blitted, during the blit operation the source alpha
+ * value is modulated by this alpha value according to the following formula:
+ *
+ * `srcA = srcA * (alpha / 255)`
+ *
+ * \param surface the SDL_Surface structure to update
+ * \param alpha the alpha value multiplied into blit operations
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_GetSurfaceAlphaMod
+ * \sa SDL_SetSurfaceColorMod
+ */
+extern DECLSPEC int SDLCALL SDL_SetSurfaceAlphaMod(SDL_Surface * surface,
+                                                   Uint8 alpha);
+
+/**
+ * Get the additional alpha value used in blit operations.
+ *
+ * \param surface the SDL_Surface structure to query
+ * \param alpha a pointer filled in with the current alpha value
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_GetSurfaceColorMod
+ * \sa SDL_SetSurfaceAlphaMod
+ */
+extern DECLSPEC int SDLCALL SDL_GetSurfaceAlphaMod(SDL_Surface * surface,
+                                                   Uint8 * alpha);
+
+/**
+ * Set the blend mode used for blit operations.
+ *
+ * To copy a surface to another surface (or texture) without blending with the
+ * existing data, the blendmode of the SOURCE surface should be set to
+ * `SDL_BLENDMODE_NONE`.
+ *
+ * \param surface the SDL_Surface structure to update
+ * \param blendMode the SDL_BlendMode to use for blit blending
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_GetSurfaceBlendMode
+ */
+extern DECLSPEC int SDLCALL SDL_SetSurfaceBlendMode(SDL_Surface * surface,
+                                                    SDL_BlendMode blendMode);
+
+/**
+ * Get the blend mode used for blit operations.
+ *
+ * \param surface the SDL_Surface structure to query
+ * \param blendMode a pointer filled in with the current SDL_BlendMode
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_SetSurfaceBlendMode
+ */
+extern DECLSPEC int SDLCALL SDL_GetSurfaceBlendMode(SDL_Surface * surface,
+                                                    SDL_BlendMode *blendMode);
+
+/**
+ * Set the clipping rectangle for a surface.
+ *
+ * When `surface` is the destination of a blit, only the area within the clip
+ * rectangle is drawn into.
+ *
+ * Note that blits are automatically clipped to the edges of the source and
+ * destination surfaces.
+ *
+ * \param surface the SDL_Surface structure to be clipped
+ * \param rect the SDL_Rect structure representing the clipping rectangle, or
+ *             NULL to disable clipping
+ * \returns SDL_TRUE if the rectangle intersects the surface, otherwise
+ *          SDL_FALSE and blits will be completely clipped.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitSurface
+ * \sa SDL_GetClipRect
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface * surface,
+                                                 const SDL_Rect * rect);
+
+/**
+ * Get the clipping rectangle for a surface.
+ *
+ * When `surface` is the destination of a blit, only the area within the clip
+ * rectangle is drawn into.
+ *
+ * \param surface the SDL_Surface structure representing the surface to be
+ *                clipped
+ * \param rect an SDL_Rect structure filled in with the clipping rectangle for
+ *             the surface
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitSurface
+ * \sa SDL_SetClipRect
+ */
+extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface,
+                                             SDL_Rect * rect);
+
+/*
+ * Creates a new surface identical to the existing surface.
+ *
+ * The returned surface should be freed with SDL_FreeSurface().
+ *
+ * \param surface the surface to duplicate.
+ * \returns a copy of the surface, or NULL on failure; call SDL_GetError() for
+ *          more information.
+ */
+extern DECLSPEC SDL_Surface *SDLCALL SDL_DuplicateSurface(SDL_Surface * surface);
+
+/**
+ * Copy an existing surface to a new surface of the specified format.
+ *
+ * This function is used to optimize images for faster *repeat* blitting. This
+ * is accomplished by converting the original and storing the result as a new
+ * surface. The new, optimized surface can then be used as the source for
+ * future blits, making them faster.
+ *
+ * \param src the existing SDL_Surface structure to convert
+ * \param fmt the SDL_PixelFormat structure that the new surface is optimized
+ *            for
+ * \param flags the flags are unused and should be set to 0; this is a
+ *              leftover from SDL 1.2's API
+ * \returns the new SDL_Surface structure that is created or NULL if it fails;
+ *          call SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_AllocFormat
+ * \sa SDL_ConvertSurfaceFormat
+ * \sa SDL_CreateRGBSurface
+ */
+extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface
+    (SDL_Surface * src, const SDL_PixelFormat * fmt, Uint32 flags);
+
+/**
+ * Copy an existing surface to a new surface of the specified format enum.
+ *
+ * This function operates just like SDL_ConvertSurface(), but accepts an
+ * SDL_PixelFormatEnum value instead of an SDL_PixelFormat structure. As such,
+ * it might be easier to call but it doesn't have access to palette
+ * information for the destination surface, in case that would be important.
+ *
+ * \param src the existing SDL_Surface structure to convert
+ * \param pixel_format the SDL_PixelFormatEnum that the new surface is
+ *                     optimized for
+ * \param flags the flags are unused and should be set to 0; this is a
+ *              leftover from SDL 1.2's API
+ * \returns the new SDL_Surface structure that is created or NULL if it fails;
+ *          call SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_AllocFormat
+ * \sa SDL_ConvertSurface
+ * \sa SDL_CreateRGBSurface
+ */
+extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurfaceFormat
+    (SDL_Surface * src, Uint32 pixel_format, Uint32 flags);
+
+/**
+ * Copy a block of pixels of one format to another format.
+ *
+ * \param width the width of the block to copy, in pixels
+ * \param height the height of the block to copy, in pixels
+ * \param src_format an SDL_PixelFormatEnum value of the `src` pixels format
+ * \param src a pointer to the source pixels
+ * \param src_pitch the pitch of the source pixels, in bytes
+ * \param dst_format an SDL_PixelFormatEnum value of the `dst` pixels format
+ * \param dst a pointer to be filled in with new pixel data
+ * \param dst_pitch the pitch of the destination pixels, in bytes
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ */
+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);
+
+/**
+ * Premultiply the alpha on a block of pixels.
+ *
+ * This is safe to use with src == dst, but not for other overlapping areas.
+ *
+ * This function is currently only implemented for SDL_PIXELFORMAT_ARGB8888.
+ *
+ * \param width the width of the block to convert, in pixels
+ * \param height the height of the block to convert, in pixels
+ * \param src_format an SDL_PixelFormatEnum value of the `src` pixels format
+ * \param src a pointer to the source pixels
+ * \param src_pitch the pitch of the source pixels, in bytes
+ * \param dst_format an SDL_PixelFormatEnum value of the `dst` pixels format
+ * \param dst a pointer to be filled in with premultiplied pixel data
+ * \param dst_pitch the pitch of the destination pixels, in bytes
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.18.
+ */
+extern DECLSPEC int SDLCALL SDL_PremultiplyAlpha(int width, int height,
+                                                 Uint32 src_format,
+                                                 const void * src, int src_pitch,
+                                                 Uint32 dst_format,
+                                                 void * dst, int dst_pitch);
+
+/**
+ * Perform a fast fill of a rectangle with a specific color.
+ *
+ * `color` should be a pixel of the format used by the surface, and can be
+ * generated by SDL_MapRGB() or SDL_MapRGBA(). If the color value contains an
+ * alpha component then the destination is simply filled with that alpha
+ * information, no blending takes place.
+ *
+ * If there is a clip rectangle set on the destination (set via
+ * SDL_SetClipRect()), then this function will fill based on the intersection
+ * of the clip rectangle and `rect`.
+ *
+ * \param dst the SDL_Surface structure that is the drawing target
+ * \param rect the SDL_Rect structure representing the rectangle to fill, or
+ *             NULL to fill the entire surface
+ * \param color the color to fill with
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_FillRects
+ */
+extern DECLSPEC int SDLCALL SDL_FillRect
+    (SDL_Surface * dst, const SDL_Rect * rect, Uint32 color);
+
+/**
+ * Perform a fast fill of a set of rectangles with a specific color.
+ *
+ * `color` should be a pixel of the format used by the surface, and can be
+ * generated by SDL_MapRGB() or SDL_MapRGBA(). If the color value contains an
+ * alpha component then the destination is simply filled with that alpha
+ * information, no blending takes place.
+ *
+ * If there is a clip rectangle set on the destination (set via
+ * SDL_SetClipRect()), then this function will fill based on the intersection
+ * of the clip rectangle and `rect`.
+ *
+ * \param dst the SDL_Surface structure that is the drawing target
+ * \param rects an array of SDL_Rects representing the rectangles to fill.
+ * \param count the number of rectangles in the array
+ * \param color the color to fill with
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_FillRect
+ */
+extern DECLSPEC int SDLCALL SDL_FillRects
+    (SDL_Surface * dst, const SDL_Rect * rects, int count, Uint32 color);
+
+/* !!! FIXME: merge this documentation with the wiki */
+/**
+ *  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.
+ *
+ *  \returns 0 if the blit is successful, otherwise it returns -1.
+ *
+ *  The blit function should not be called on a locked surface.
+ *
+ *  The blit semantics for surfaces with and without blending and colorkey
+ *  are defined as follows:
+ *  \verbatim
+    RGBA->RGB:
+      Source surface blend mode set to SDL_BLENDMODE_BLEND:
+        alpha-blend (using the source alpha-channel and per-surface alpha)
+        SDL_SRCCOLORKEY ignored.
+      Source surface blend mode set to SDL_BLENDMODE_NONE:
+        copy RGB.
+        if SDL_SRCCOLORKEY set, only copy the pixels matching the
+        RGB values of the source color key, ignoring alpha in the
+        comparison.
+
+    RGB->RGBA:
+      Source surface blend mode set to SDL_BLENDMODE_BLEND:
+        alpha-blend (using the source per-surface alpha)
+      Source surface blend mode set to SDL_BLENDMODE_NONE:
+        copy RGB, set destination alpha to source per-surface alpha value.
+      both:
+        if SDL_SRCCOLORKEY set, only copy the pixels matching the
+        source color key.
+
+    RGBA->RGBA:
+      Source surface blend mode set to SDL_BLENDMODE_BLEND:
+        alpha-blend (using the source alpha-channel and per-surface alpha)
+        SDL_SRCCOLORKEY ignored.
+      Source surface blend mode set to SDL_BLENDMODE_NONE:
+        copy all of RGBA to the destination.
+        if SDL_SRCCOLORKEY set, only copy the pixels matching the
+        RGB values of the source color key, ignoring alpha in the
+        comparison.
+
+    RGB->RGB:
+      Source surface blend mode set to SDL_BLENDMODE_BLEND:
+        alpha-blend (using the source per-surface alpha)
+      Source surface blend mode set to SDL_BLENDMODE_NONE:
+        copy RGB.
+      both:
+        if SDL_SRCCOLORKEY set, only copy the pixels matching the
+        source color key.
+    \endverbatim
+ *
+ *  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
+
+/**
+ * Perform a fast blit from the source surface to the destination surface.
+ *
+ * SDL_UpperBlit() has been replaced by SDL_BlitSurface(), which is merely a
+ * macro for this function with a less confusing name.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitSurface
+ */
+extern DECLSPEC int SDLCALL SDL_UpperBlit
+    (SDL_Surface * src, const SDL_Rect * srcrect,
+     SDL_Surface * dst, SDL_Rect * dstrect);
+
+/**
+ * Perform low-level surface blitting only.
+ *
+ * This is a semi-private blit function and it performs low-level surface
+ * blitting, assuming the input rectangles have already been clipped.
+ *
+ * Unless you know what you're doing, you should be using SDL_BlitSurface()
+ * instead.
+ *
+ * \param src the SDL_Surface structure to be copied from
+ * \param srcrect the SDL_Rect structure representing the rectangle to be
+ *                copied, or NULL to copy the entire surface
+ * \param dst the SDL_Surface structure that is the blit target
+ * \param dstrect the SDL_Rect structure representing the rectangle that is
+ *                copied into
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitSurface
+ */
+extern DECLSPEC int SDLCALL SDL_LowerBlit
+    (SDL_Surface * src, SDL_Rect * srcrect,
+     SDL_Surface * dst, SDL_Rect * dstrect);
+
+
+/**
+ * Perform a fast, low quality, stretch blit between two surfaces of the same
+ * format.
+ *
+ * Please use SDL_BlitScaled() instead.
+ *
+ * \since This function is available since SDL 2.0.0.
+ */
+extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src,
+                                            const SDL_Rect * srcrect,
+                                            SDL_Surface * dst,
+                                            const SDL_Rect * dstrect);
+
+/**
+ * Perform bilinear scaling between two surfaces of the same format, 32BPP.
+ *
+ * \since This function is available since SDL 2.0.16.
+ */
+extern DECLSPEC int SDLCALL SDL_SoftStretchLinear(SDL_Surface * src,
+                                            const SDL_Rect * srcrect,
+                                            SDL_Surface * dst,
+                                            const SDL_Rect * dstrect);
+
+
+#define SDL_BlitScaled SDL_UpperBlitScaled
+
+/**
+ * Perform a scaled surface copy to a destination surface.
+ *
+ * SDL_UpperBlitScaled() has been replaced by SDL_BlitScaled(), which is
+ * merely a macro for this function with a less confusing name.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitScaled
+ */
+extern DECLSPEC int SDLCALL SDL_UpperBlitScaled
+    (SDL_Surface * src, const SDL_Rect * srcrect,
+    SDL_Surface * dst, SDL_Rect * dstrect);
+
+/**
+ * Perform low-level surface scaled blitting only.
+ *
+ * This is a semi-private function and it performs low-level surface blitting,
+ * assuming the input rectangles have already been clipped.
+ *
+ * \param src the SDL_Surface structure to be copied from
+ * \param srcrect the SDL_Rect structure representing the rectangle to be
+ *                copied
+ * \param dst the SDL_Surface structure that is the blit target
+ * \param dstrect the SDL_Rect structure representing the rectangle that is
+ *                copied into
+ * \returns 0 on success or a negative error code on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_BlitScaled
+ */
+extern DECLSPEC int SDLCALL SDL_LowerBlitScaled
+    (SDL_Surface * src, SDL_Rect * srcrect,
+    SDL_Surface * dst, SDL_Rect * dstrect);
+
+/**
+ * Set the YUV conversion mode
+ *
+ * \since This function is available since SDL 2.0.8.
+ */
+extern DECLSPEC void SDLCALL SDL_SetYUVConversionMode(SDL_YUV_CONVERSION_MODE mode);
+
+/**
+ * Get the YUV conversion mode
+ *
+ * \since This function is available since SDL 2.0.8.
+ */
+extern DECLSPEC SDL_YUV_CONVERSION_MODE SDLCALL SDL_GetYUVConversionMode(void);
+
+/**
+ * Get the YUV conversion mode, returning the correct mode for the resolution
+ * when the current conversion mode is SDL_YUV_CONVERSION_AUTOMATIC
+ *
+ * \since This function is available since SDL 2.0.8.
+ */
+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: */