SDL_surface.c File Reference

#include "../SDL_internal.h"
#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_RLEaccel_c.h"
#include "SDL_pixels_c.h"

Include dependency graph for SDL_surface.c:

Go to the source code of this file.

Functions
	SDL_COMPILE_TIME_ASSERT (surface_size_assumptions, sizeof(int)==sizeof(Sint32)&&sizeof(size_t) >=sizeof(Sint32))
SDL_Surface *	SDL_CreateRGBSurface (Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
SDL_Surface *	SDL_CreateRGBSurfaceFrom (void *pixels, int width, int height, int depth, int pitch, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
int	SDL_SetSurfacePalette (SDL_Surface *surface, SDL_Palette *palette)
	Set the palette used by a surface. More...
int	SDL_SetSurfaceRLE (SDL_Surface *surface, int flag)
	Sets the RLE acceleration hint for a surface. More...
int	SDL_SetColorKey (SDL_Surface *surface, int flag, Uint32 key)
	Sets the color key (transparent pixel) in a blittable surface. More...
int	SDL_GetColorKey (SDL_Surface *surface, Uint32 *key)
	Gets the color key (transparent pixel) in a blittable surface. More...
static void	SDL_ConvertColorkeyToAlpha (SDL_Surface *surface)
int	SDL_SetSurfaceColorMod (SDL_Surface *surface, Uint8 r, Uint8 g, Uint8 b)
	Set an additional color value used in blit operations. More...
int	SDL_GetSurfaceColorMod (SDL_Surface *surface, Uint8 *r, Uint8 *g, Uint8 *b)
	Get the additional color value used in blit operations. More...
int	SDL_SetSurfaceAlphaMod (SDL_Surface *surface, Uint8 alpha)
	Set an additional alpha value used in blit operations. More...
int	SDL_GetSurfaceAlphaMod (SDL_Surface *surface, Uint8 *alpha)
	Get the additional alpha value used in blit operations. More...
int	SDL_SetSurfaceBlendMode (SDL_Surface *surface, SDL_BlendMode blendMode)
	Set the blend mode used for blit operations. More...
int	SDL_GetSurfaceBlendMode (SDL_Surface *surface, SDL_BlendMode *blendMode)
	Get the blend mode used for blit operations. More...
SDL_bool	SDL_SetClipRect (SDL_Surface *surface, const SDL_Rect *rect)
void	SDL_GetClipRect (SDL_Surface *surface, SDL_Rect *rect)
int	SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
int	SDL_UpperBlit (SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
int	SDL_UpperBlitScaled (SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
int	SDL_LowerBlitScaled (SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
int	SDL_LockSurface (SDL_Surface *surface)
	Sets up a surface for directly accessing the pixels. More...
void	SDL_UnlockSurface (SDL_Surface *surface)
SDL_Surface *	SDL_ConvertSurface (SDL_Surface *surface, const SDL_PixelFormat *format, Uint32 flags)
SDL_Surface *	SDL_ConvertSurfaceFormat (SDL_Surface *surface, Uint32 pixel_format, Uint32 flags)
static SDL_INLINE SDL_bool	SDL_CreateSurfaceOnStack (int width, int height, Uint32 pixel_format, void *pixels, int pitch, SDL_Surface *surface, SDL_PixelFormat *format, SDL_BlitMap *blitmap)
int	SDL_ConvertPixels (int width, int height, Uint32 src_format, const void *src, int src_pitch, Uint32 dst_format, void *dst, int dst_pitch)
	Copy a block of pixels of one format to another format. More...
void	SDL_FreeSurface (SDL_Surface *surface)

Function Documentation

SDL_COMPILE_TIME_ASSERT	(	surface_size_assumptions	,
		sizeof(int)	= =sizeof(Sint32)&&sizeof(size_t) >=sizeof(Sint32)
	)

static void SDL_ConvertColorkeyToAlpha ( SDL_Surface *  surface )

static

Definition at line 253 of file SDL_surface.c.

References SDL_PixelFormat::Amask, SDL_PixelFormat::BytesPerPixel, SDL_BlitInfo::colorkey, SDL_BlitInfo::flags, SDL_Surface::format, SDL_Surface::h, SDL_BlitMap::info, SDL_Surface::map, SDL_Surface::pitch, SDL_Surface::pixels, SDL_BLENDMODE_BLEND, SDL_COPY_COLORKEY, SDL_LockSurface(), SDL_SetColorKey(), SDL_SetSurfaceBlendMode(), SDL_UnlockSurface(), and SDL_Surface::w.

Referenced by SDL_ConvertSurface().

{
    int x, y;

    if (!surface) {
        return;
    }

    if (!(surface->map->info.flags & SDL_COPY_COLORKEY) ||
        !surface->format->Amask) {
        return;
    }

    SDL_LockSurface(surface);

    switch (surface->format->BytesPerPixel) {
    case 2:
        {
            Uint16 *row, *spot;
            Uint16 ckey = (Uint16) surface->map->info.colorkey;
            Uint16 mask = (Uint16) (~surface->format->Amask);

            /* Ignore alpha in colorkey comparison */
            ckey &= mask;
            row = (Uint16 *) surface->pixels;
            for (y = surface->h; y--;) {
                spot = row;
                for (x = surface->w; x--;) {
                    if ((*spot & mask) == ckey) {
                        *spot &= mask;
                    }
                    ++spot;
                }
                row += surface->pitch / 2;
            }
        }
        break;
    case 3:
        /* FIXME */
        break;
    case 4:
        {
            Uint32 *row, *spot;
            Uint32 ckey = surface->map->info.colorkey;
            Uint32 mask = ~surface->format->Amask;

            /* Ignore alpha in colorkey comparison */
            ckey &= mask;
            row = (Uint32 *) surface->pixels;
            for (y = surface->h; y--;) {
                spot = row;
                for (x = surface->w; x--;) {
                    if ((*spot & mask) == ckey) {
                        *spot &= mask;
                    }
                    ++spot;
                }
                row += surface->pitch / 4;
            }
        }
        break;
    }

    SDL_UnlockSurface(surface);

    SDL_SetColorKey(surface, 0, 0);
    SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
}

int SDL_ConvertPixels	(	int	width,
		int	height,
		Uint32	src_format,
		const void *	src,
		int	src_pitch,
		Uint32	dst_format,
		void *	dst,
		int	dst_pitch
	)

Copy a block of pixels of one format to another format.

Returns

0 on success, or -1 if there was an error

Definition at line 1035 of file SDL_surface.c.

References SDL_Rect::h, i, rect, SDL_BYTESPERPIXEL, SDL_CreateSurfaceOnStack(), SDL_InvalidParamError, SDL_ISPIXELFORMAT_FOURCC, SDL_LowerBlit(), SDL_memcpy, SDL_PIXELFORMAT_IYUV, SDL_PIXELFORMAT_NV12, SDL_PIXELFORMAT_NV21, SDL_PIXELFORMAT_UYVY, SDL_PIXELFORMAT_YUY2, SDL_PIXELFORMAT_YV12, SDL_PIXELFORMAT_YVYU, SDL_SetError, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

{
    SDL_Surface src_surface, dst_surface;
    SDL_PixelFormat src_fmt, dst_fmt;
    SDL_BlitMap src_blitmap, dst_blitmap;
    SDL_Rect rect;
    void *nonconst_src = (void *) src;

    /* Check to make sure we are blitting somewhere, so we don't crash */
    if (!dst) {
        return SDL_InvalidParamError("dst");
    }
    if (!dst_pitch) {
        return SDL_InvalidParamError("dst_pitch");
    }

    /* Fast path for same format copy */
    if (src_format == dst_format) {
        int bpp, i;

        if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
            switch (src_format) {
            case SDL_PIXELFORMAT_YUY2:
            case SDL_PIXELFORMAT_UYVY:
            case SDL_PIXELFORMAT_YVYU:
                bpp = 2;
                break;
            case SDL_PIXELFORMAT_YV12:
            case SDL_PIXELFORMAT_IYUV:
            case SDL_PIXELFORMAT_NV12:
            case SDL_PIXELFORMAT_NV21:
                bpp = 1;
                break;
            default:
                return SDL_SetError("Unknown FOURCC pixel format");
            }
        } else {
            bpp = SDL_BYTESPERPIXEL(src_format);
        }
        width *= bpp;

        for (i = height; i--;) {
            SDL_memcpy(dst, src, width);
            src = (Uint8*)src + src_pitch;
            dst = (Uint8*)dst + dst_pitch;
        }

        if (src_format == SDL_PIXELFORMAT_YV12 || src_format == SDL_PIXELFORMAT_IYUV) {
            /* U and V planes are a quarter the size of the Y plane */
            width /= 2;
            height /= 2;
            src_pitch /= 2;
            dst_pitch /= 2;
            for (i = height * 2; i--;) {
                SDL_memcpy(dst, src, width);
                src = (Uint8*)src + src_pitch;
                dst = (Uint8*)dst + dst_pitch;
            }
        } else if (src_format == SDL_PIXELFORMAT_NV12 || src_format == SDL_PIXELFORMAT_NV21) {
            /* U/V plane is half the height of the Y plane */
            height /= 2;
            for (i = height; i--;) {
                SDL_memcpy(dst, src, width);
                src = (Uint8*)src + src_pitch;
                dst = (Uint8*)dst + dst_pitch;
            }
        }
        return 0;
    }

    if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src,
                                  src_pitch,
                                  &src_surface, &src_fmt, &src_blitmap)) {
        return -1;
    }
    if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
                                  &dst_surface, &dst_fmt, &dst_blitmap)) {
        return -1;
    }

    /* Set up the rect and go! */
    rect.x = 0;
    rect.y = 0;
    rect.w = width;
    rect.h = height;
    return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
}

SDL_Surface* SDL_ConvertSurface	(	SDL_Surface *	src,
		const SDL_PixelFormat *	fmt,
		Uint32	flags
	)

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.

Definition at line 855 of file SDL_surface.c.

References SDL_BlitInfo::a, SDL_Color::a, SDL_PixelFormat::Amask, SDL_BlitInfo::b, SDL_Color::b, SDL_PixelFormat::BitsPerPixel, SDL_PixelFormat::Bmask, SDL_Surface::clip_rect, SDL_BlitInfo::colorkey, SDL_Palette::colors, SDL_BlitInfo::flags, SDL_Surface::format, SDL_BlitInfo::g, SDL_Color::g, SDL_PixelFormat::Gmask, SDL_Rect::h, SDL_Surface::h, i, SDL_BlitMap::info, SDL_Surface::map, SDL_Palette::ncolors, NULL, SDL_PixelFormat::palette, SDL_BlitInfo::r, SDL_Color::r, SDL_PixelFormat::Rmask, SDL_BLENDMODE_BLEND, SDL_ConvertColorkeyToAlpha(), SDL_COPY_BLEND, SDL_COPY_COLORKEY, SDL_COPY_MODULATE_ALPHA, SDL_COPY_RLE_ALPHAKEY, SDL_COPY_RLE_COLORKEY, SDL_COPY_RLE_DESIRED, SDL_CreateRGBSurface(), SDL_FALSE, SDL_GetRGBA, SDL_InvalidateMap(), SDL_LowerBlit(), SDL_MapRGBA, SDL_memcmp, SDL_memcpy, SDL_RLEACCEL, SDL_SetClipRect(), SDL_SetColorKey(), SDL_SetError, SDL_SetSurfaceBlendMode(), SDL_SetSurfaceRLE(), SDL_TRUE, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_ConvertSurfaceFormat().

{
    SDL_Surface *convert;
    Uint32 copy_flags;
    SDL_Color copy_color;
    SDL_Rect bounds;

    /* Check for empty destination palette! (results in empty image) */
    if (format->palette != NULL) {
        int i;
        for (i = 0; i < format->palette->ncolors; ++i) {
            if ((format->palette->colors[i].r != 0xFF) ||
                (format->palette->colors[i].g != 0xFF) ||
                (format->palette->colors[i].b != 0xFF))
                break;
        }
        if (i == format->palette->ncolors) {
            SDL_SetError("Empty destination palette");
            return (NULL);
        }
    }

    /* Create a new surface with the desired format */
    convert = SDL_CreateRGBSurface(flags, surface->w, surface->h,
                                   format->BitsPerPixel, format->Rmask,
                                   format->Gmask, format->Bmask,
                                   format->Amask);
    if (convert == NULL) {
        return (NULL);
    }

    /* Copy the palette if any */
    if (format->palette && convert->format->palette) {
        SDL_memcpy(convert->format->palette->colors,
                   format->palette->colors,
                   format->palette->ncolors * sizeof(SDL_Color));
        convert->format->palette->ncolors = format->palette->ncolors;
    }

    /* Save the original copy flags */
    copy_flags = surface->map->info.flags;
    copy_color.r = surface->map->info.r;
    copy_color.g = surface->map->info.g;
    copy_color.b = surface->map->info.b;
    copy_color.a = surface->map->info.a;
    surface->map->info.r = 0xFF;
    surface->map->info.g = 0xFF;
    surface->map->info.b = 0xFF;
    surface->map->info.a = 0xFF;
    surface->map->info.flags = 0;
    SDL_InvalidateMap(surface->map);

    /* Copy over the image data */
    bounds.x = 0;
    bounds.y = 0;
    bounds.w = surface->w;
    bounds.h = surface->h;
    SDL_LowerBlit(surface, &bounds, convert, &bounds);

    /* Clean up the original surface, and update converted surface */
    convert->map->info.r = copy_color.r;
    convert->map->info.g = copy_color.g;
    convert->map->info.b = copy_color.b;
    convert->map->info.a = copy_color.a;
    convert->map->info.flags =
        (copy_flags &
         ~(SDL_COPY_COLORKEY | SDL_COPY_BLEND
           | SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY |
           SDL_COPY_RLE_ALPHAKEY));
    surface->map->info.r = copy_color.r;
    surface->map->info.g = copy_color.g;
    surface->map->info.b = copy_color.b;
    surface->map->info.a = copy_color.a;
    surface->map->info.flags = copy_flags;
    SDL_InvalidateMap(surface->map);
    if (copy_flags & SDL_COPY_COLORKEY) {
        SDL_bool set_colorkey_by_color = SDL_FALSE;

        if (surface->format->palette) {
            if (format->palette &&
                surface->format->palette->ncolors <= format->palette->ncolors &&
                (SDL_memcmp(surface->format->palette->colors, format->palette->colors,
                  surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) {
                /* The palette is identical, just set the same colorkey */
                SDL_SetColorKey(convert, 1, surface->map->info.colorkey);
            } else if (format->Amask) {
                /* The alpha was set in the destination from the palette */
            } else {
                set_colorkey_by_color = SDL_TRUE;
            }
        } else {
            set_colorkey_by_color = SDL_TRUE;
        }

        if (set_colorkey_by_color) {
            /* Set the colorkey by color, which needs to be unique */
            Uint8 keyR, keyG, keyB, keyA;

            SDL_GetRGBA(surface->map->info.colorkey, surface->format, &keyR,
                        &keyG, &keyB, &keyA);
            SDL_SetColorKey(convert, 1,
                            SDL_MapRGBA(convert->format, keyR, keyG, keyB, keyA));
            /* This is needed when converting for 3D texture upload */
            SDL_ConvertColorkeyToAlpha(convert);
        }
    }
    SDL_SetClipRect(convert, &surface->clip_rect);

    /* Enable alpha blending by default if the new surface has an
     * alpha channel or alpha modulation */
    if ((surface->format->Amask && format->Amask) ||
        (copy_flags & (SDL_COPY_COLORKEY|SDL_COPY_MODULATE_ALPHA))) {
        SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND);
    }
    if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) {
        SDL_SetSurfaceRLE(convert, SDL_RLEACCEL);
    }

    /* We're ready to go! */
    return (convert);
}

SDL_Surface* SDL_ConvertSurfaceFormat	(	SDL_Surface *	surface,
		Uint32	pixel_format,
		Uint32	flags
	)

Definition at line 979 of file SDL_surface.c.

References NULL, SDL_AllocFormat, SDL_ConvertSurface(), SDL_FreeFormat, and SDL_INLINE.

{
    SDL_PixelFormat *fmt;
    SDL_Surface *convert = NULL;

    fmt = SDL_AllocFormat(pixel_format);
    if (fmt) {
        convert = SDL_ConvertSurface(surface, fmt, flags);
        SDL_FreeFormat(fmt);
    }
    return convert;
}

SDL_Surface* SDL_CreateRGBSurface	(	Uint32	flags,
		int	width,
		int	height,
		int	depth,
		Uint32	Rmask,
		Uint32	Gmask,
		Uint32	Bmask,
		Uint32	Amask
	)

Allocate and free an RGB surface.

If the depth is 4 or 8 bits, an empty palette is allocated for the surface. If the depth is greater than 8 bits, the pixel format is set using the flags '[RGB]mask'.

If the function runs out of memory, it will return NULL.

Parameters

flags	The flags are obsolete and should be set to 0.
width	The width in pixels of the surface to create.
height	The height in pixels of the surface to create.
depth	The depth in bits of the surface to create.
Rmask	The red mask of the surface to create.
Gmask	The green mask of the surface to create.
Bmask	The blue mask of the surface to create.
Amask	The alpha mask of the surface to create.

Definition at line 38 of file SDL_surface.c.

References SDL_Color::b, SDL_PixelFormat::BitsPerPixel, SDL_Palette::colors, SDL_Surface::format, SDL_PixelFormat::format, SDL_Color::g, SDL_Surface::h, SDL_Surface::map, SDL_Palette::ncolors, NULL, SDL_Surface::pitch, SDL_Surface::pixels, SDL_Color::r, SDL_Surface::refcount, SDL_AllocBlitMap(), SDL_AllocFormat, SDL_AllocPalette, SDL_BLENDMODE_BLEND, SDL_CalculatePitch(), SDL_calloc(), SDL_FreePalette, SDL_FreeSurface(), SDL_ISPIXELFORMAT_INDEXED, SDL_malloc, SDL_MasksToPixelFormatEnum, SDL_MAX_SINT32, SDL_memset, SDL_OutOfMemory, SDL_PIXELFORMAT_UNKNOWN, SDL_SetClipRect(), SDL_SetError, SDL_SetSurfaceBlendMode(), SDL_SetSurfacePalette(), void, and SDL_Surface::w.

Referenced by SDL_ConvertSurface(), and SDL_CreateRGBSurfaceFrom().

{
    SDL_Surface *surface;
    Uint32 format;

    /* The flags are no longer used, make the compiler happy */
    (void)flags;

    /* Get the pixel format */
    format = SDL_MasksToPixelFormatEnum(depth, Rmask, Gmask, Bmask, Amask);
    if (format == SDL_PIXELFORMAT_UNKNOWN) {
        SDL_SetError("Unknown pixel format");
        return NULL;
    }

    /* Allocate the surface */
    surface = (SDL_Surface *) SDL_calloc(1, sizeof(*surface));
    if (surface == NULL) {
        SDL_OutOfMemory();
        return NULL;
    }

    surface->format = SDL_AllocFormat(format);
    if (!surface->format) {
        SDL_FreeSurface(surface);
        return NULL;
    }
    surface->w = width;
    surface->h = height;
    surface->pitch = SDL_CalculatePitch(surface);
    SDL_SetClipRect(surface, NULL);

    if (SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) {
        SDL_Palette *palette =
            SDL_AllocPalette((1 << surface->format->BitsPerPixel));
        if (!palette) {
            SDL_FreeSurface(surface);
            return NULL;
        }
        if (palette->ncolors == 2) {
            /* Create a black and white bitmap palette */
            palette->colors[0].r = 0xFF;
            palette->colors[0].g = 0xFF;
            palette->colors[0].b = 0xFF;
            palette->colors[1].r = 0x00;
            palette->colors[1].g = 0x00;
            palette->colors[1].b = 0x00;
        }
        SDL_SetSurfacePalette(surface, palette);
        SDL_FreePalette(palette);
    }

    /* Get the pixels */
    if (surface->w && surface->h) {
        /* Assumptions checked in surface_size_assumptions assert above */
        Sint64 size = ((Sint64)surface->h * surface->pitch);
        if (size < 0 || size > SDL_MAX_SINT32) {
            /* Overflow... */
            SDL_FreeSurface(surface);
            SDL_OutOfMemory();
            return NULL;
        }

        surface->pixels = SDL_malloc((size_t)size);
        if (!surface->pixels) {
            SDL_FreeSurface(surface);
            SDL_OutOfMemory();
            return NULL;
        }
        /* This is important for bitmaps */
        SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
    }

    /* Allocate an empty mapping */
    surface->map = SDL_AllocBlitMap();
    if (!surface->map) {
        SDL_FreeSurface(surface);
        return NULL;
    }

    /* By default surface with an alpha mask are set up for blending */
    if (Amask) {
        SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
    }

    /* The surface is ready to go */
    surface->refcount = 1;
    return surface;
}

SDL_Surface* SDL_CreateRGBSurfaceFrom	(	void *	pixels,
		int	width,
		int	height,
		int	depth,
		int	pitch,
		Uint32	Rmask,
		Uint32	Gmask,
		Uint32	Bmask,
		Uint32	Amask
	)

Definition at line 134 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::h, NULL, SDL_Surface::pitch, SDL_Surface::pixels, SDL_CreateRGBSurface(), SDL_PREALLOC, SDL_SetClipRect(), and SDL_Surface::w.

{
    SDL_Surface *surface;

    surface =
        SDL_CreateRGBSurface(0, 0, 0, depth, Rmask, Gmask, Bmask, Amask);
    if (surface != NULL) {
        surface->flags |= SDL_PREALLOC;
        surface->pixels = pixels;
        surface->w = width;
        surface->h = height;
        surface->pitch = pitch;
        SDL_SetClipRect(surface, NULL);
    }
    return surface;
}

static SDL_INLINE SDL_bool SDL_CreateSurfaceOnStack ( int  width, int  height, Uint32  pixel_format, void *  pixels, int  pitch, SDL_Surface *  surface, SDL_PixelFormat *  format, SDL_BlitMap *  blitmap  )

static

Definition at line 997 of file SDL_surface.c.

References SDL_BlitInfo::a, SDL_BlitInfo::b, SDL_Surface::flags, SDL_Surface::format, SDL_BlitInfo::g, SDL_Surface::h, SDL_BlitMap::info, SDL_Surface::map, SDL_Surface::pitch, SDL_Surface::pixels, SDL_BlitInfo::r, SDL_Surface::refcount, SDL_FALSE, SDL_InitFormat(), SDL_ISPIXELFORMAT_INDEXED, SDL_PREALLOC, SDL_SetError, SDL_TRUE, SDL_zerop, and SDL_Surface::w.

Referenced by SDL_ConvertPixels().

{
    if (SDL_ISPIXELFORMAT_INDEXED(pixel_format)) {
        SDL_SetError("Indexed pixel formats not supported");
        return SDL_FALSE;
    }
    if (SDL_InitFormat(format, pixel_format) < 0) {
        return SDL_FALSE;
    }

    SDL_zerop(surface);
    surface->flags = SDL_PREALLOC;
    surface->format = format;
    surface->pixels = pixels;
    surface->w = width;
    surface->h = height;
    surface->pitch = pitch;
    /* We don't actually need to set up the clip rect for our purposes */
    /* SDL_SetClipRect(surface, NULL); */

    /* Allocate an empty mapping */
    SDL_zerop(blitmap);
    blitmap->info.r = 0xFF;
    blitmap->info.g = 0xFF;
    blitmap->info.b = 0xFF;
    blitmap->info.a = 0xFF;
    surface->map = blitmap;

    /* The surface is ready to go */
    surface->refcount = 1;
    return SDL_TRUE;
}

void SDL_FreeSurface

(

SDL_Surface *

surface

)

Definition at line 1129 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::format, SDL_Surface::locked, SDL_Surface::map, NULL, SDL_Surface::pixels, SDL_Surface::refcount, SDL_DONTFREE, SDL_free(), SDL_FreeBlitMap(), SDL_FreeFormat, SDL_PREALLOC, SDL_RLEACCEL, SDL_SetSurfacePalette(), SDL_UnlockSurface(), and SDL_UnRLESurface().

Referenced by SDL_CreateRGBSurface().

{
    if (surface == NULL) {
        return;
    }
    if (surface->flags & SDL_DONTFREE) {
        return;
    }
    if (--surface->refcount > 0) {
        return;
    }
    while (surface->locked > 0) {
        SDL_UnlockSurface(surface);
    }
    if (surface->flags & SDL_RLEACCEL) {
        SDL_UnRLESurface(surface, 0);
    }
    if (surface->format) {
        SDL_SetSurfacePalette(surface, NULL);
        SDL_FreeFormat(surface->format);
        surface->format = NULL;
    }
    if (surface->map != NULL) {
        SDL_FreeBlitMap(surface->map);
        surface->map = NULL;
    }
    if (!(surface->flags & SDL_PREALLOC)) {
        SDL_free(surface->pixels);
    }
    SDL_free(surface);
}

void SDL_GetClipRect	(	SDL_Surface *	surface,
		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.

Definition at line 494 of file SDL_surface.c.

References SDL_Surface::clip_rect.

{
    if (surface && rect) {
        *rect = surface->clip_rect;
    }
}

int SDL_GetColorKey	(	SDL_Surface *	surface,
		Uint32 *	key
	)

Gets the color key (transparent pixel) in a blittable surface.

Parameters

surface	The surface to update
key	A pointer filled in with the transparent pixel in the native surface format

Returns

0 on success, or -1 if the surface is not valid or colorkey is not enabled.

Definition at line 235 of file SDL_surface.c.

References SDL_BlitInfo::colorkey, SDL_BlitInfo::flags, SDL_BlitMap::info, SDL_Surface::map, and SDL_COPY_COLORKEY.

{
    if (!surface) {
        return -1;
    }

    if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) {
        return -1;
    }

    if (key) {
        *key = surface->map->info.colorkey;
    }
    return 0;
}

int SDL_GetSurfaceAlphaMod	(	SDL_Surface *	surface,
		Uint8 *	alpha
	)

Get the additional alpha value used in blit operations.

Parameters

surface	The surface to query.
alpha	A pointer filled in with the current alpha value.

Returns

0 on success, or -1 if the surface is not valid.

See also

SDL_SetSurfaceAlphaMod()

Definition at line 391 of file SDL_surface.c.

References SDL_BlitInfo::a, SDL_BlitMap::info, and SDL_Surface::map.

{
    if (!surface) {
        return -1;
    }

    if (alpha) {
        *alpha = surface->map->info.a;
    }
    return 0;
}

int SDL_GetSurfaceBlendMode	(	SDL_Surface *	surface,
		SDL_BlendMode *	blendMode
	)

Get the blend mode used for blit operations.

Parameters

surface	The surface to query.
blendMode	A pointer filled in with the current blend mode.

Returns

0 on success, or -1 if the surface is not valid.

See also

SDL_SetSurfaceBlendMode()

Definition at line 441 of file SDL_surface.c.

References SDL_Surface::map, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BLENDMODE_MOD, SDL_BLENDMODE_NONE, SDL_COPY_ADD, SDL_COPY_BLEND, and SDL_COPY_MOD.

{
    if (!surface) {
        return -1;
    }

    if (!blendMode) {
        return 0;
    }

    switch (surface->map->
            info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)) {
    case SDL_COPY_BLEND:
        *blendMode = SDL_BLENDMODE_BLEND;
        break;
    case SDL_COPY_ADD:
        *blendMode = SDL_BLENDMODE_ADD;
        break;
    case SDL_COPY_MOD:
        *blendMode = SDL_BLENDMODE_MOD;
        break;
    default:
        *blendMode = SDL_BLENDMODE_NONE;
        break;
    }
    return 0;
}

int SDL_GetSurfaceColorMod	(	SDL_Surface *	surface,
		Uint8 *	r,
		Uint8 *	g,
		Uint8 *	b
	)

Get the additional color value used in blit operations.

Parameters

surface	The surface to query.
r	A pointer filled in with the current red color value.
g	A pointer filled in with the current green color value.
b	A pointer filled in with the current blue color value.

Returns

0 on success, or -1 if the surface is not valid.

See also

SDL_SetSurfaceColorMod()

Definition at line 349 of file SDL_surface.c.

References SDL_BlitInfo::b, SDL_BlitInfo::g, SDL_BlitMap::info, SDL_Surface::map, and SDL_BlitInfo::r.

{
    if (!surface) {
        return -1;
    }

    if (r) {
        *r = surface->map->info.r;
    }
    if (g) {
        *g = surface->map->info.g;
    }
    if (b) {
        *b = surface->map->info.b;
    }
    return 0;
}

int SDL_LockSurface

(

SDL_Surface *

surface

)

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.

See also

SDL_UnlockSurface()

Definition at line 816 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::locked, SDL_RLEACCEL, and SDL_UnRLESurface().

Referenced by SDL_ConvertColorkeyToAlpha().

{
    if (!surface->locked) {
        /* Perform the lock */
        if (surface->flags & SDL_RLEACCEL) {
            SDL_UnRLESurface(surface, 1);
            surface->flags |= SDL_RLEACCEL;     /* save accel'd state */
        }
    }

    /* Increment the surface lock count, for recursive locks */
    ++surface->locked;

    /* Ready to go.. */
    return (0);
}

int SDL_LowerBlit	(	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.

Definition at line 513 of file SDL_surface.c.

References SDL_BlitMap::blit, SDL_BlitMap::dst, SDL_BlitMap::dst_palette_version, SDL_Surface::format, SDL_Surface::map, SDL_PixelFormat::palette, SDL_MapSurface(), SDL_BlitMap::src_palette_version, and SDL_Palette::version.

Referenced by SDL_ConvertPixels(), SDL_ConvertSurface(), SDL_LowerBlitScaled(), and SDL_UpperBlit().

{
    /* Check to make sure the blit mapping is valid */
    if ((src->map->dst != dst) ||
        (dst->format->palette &&
         src->map->dst_palette_version != dst->format->palette->version) ||
        (src->format->palette &&
         src->map->src_palette_version != src->format->palette->version)) {
        if (SDL_MapSurface(src, dst) < 0) {
            return (-1);
        }
        /* just here for debugging */
/*         printf */
/*             ("src = 0x%08X src->flags = %08X src->map->info.flags = %08x\ndst = 0x%08X dst->flags = %08X dst->map->info.flags = %08X\nsrc->map->blit = 0x%08x\n", */
/*              src, dst->flags, src->map->info.flags, dst, dst->flags, */
/*              dst->map->info.flags, src->map->blit); */
    }
    return (src->map->blit(src, srcrect, dst, dstrect));
}

int SDL_LowerBlitScaled	(	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 scaled blitting only.

Definition at line 789 of file SDL_surface.c.

References SDL_BlitInfo::flags, SDL_Surface::format, SDL_PixelFormat::format, SDL_BlitMap::info, SDL_Surface::map, SDL_COPY_ADD, SDL_COPY_BLEND, SDL_COPY_COLORKEY, SDL_COPY_MOD, SDL_COPY_MODULATE_ALPHA, SDL_COPY_MODULATE_COLOR, SDL_COPY_NEAREST, SDL_InvalidateMap(), SDL_ISPIXELFORMAT_INDEXED, SDL_LowerBlit(), and SDL_SoftStretch.

Referenced by SDL_UpperBlitScaled().

{
    static const Uint32 complex_copy_flags = (
        SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA |
        SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD |
        SDL_COPY_COLORKEY
    );

    if (!(src->map->info.flags & SDL_COPY_NEAREST)) {
        src->map->info.flags |= SDL_COPY_NEAREST;
        SDL_InvalidateMap(src->map);
    }

    if ( !(src->map->info.flags & complex_copy_flags) &&
         src->format->format == dst->format->format &&
         !SDL_ISPIXELFORMAT_INDEXED(src->format->format) ) {
        return SDL_SoftStretch( src, srcrect, dst, dstrect );
    } else {
        return SDL_LowerBlit( src, srcrect, dst, dstrect );
    }
}

SDL_bool SDL_SetClipRect	(	SDL_Surface *	surface,
		const SDL_Rect *	rect
	)

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.

Definition at line 470 of file SDL_surface.c.

References SDL_Surface::clip_rect, SDL_Rect::h, SDL_Surface::h, SDL_FALSE, SDL_IntersectRect, SDL_TRUE, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_ConvertSurface(), SDL_CreateRGBSurface(), and SDL_CreateRGBSurfaceFrom().

{
    SDL_Rect full_rect;

    /* Don't do anything if there's no surface to act on */
    if (!surface) {
        return SDL_FALSE;
    }

    /* Set up the full surface rectangle */
    full_rect.x = 0;
    full_rect.y = 0;
    full_rect.w = surface->w;
    full_rect.h = surface->h;

    /* Set the clipping rectangle */
    if (!rect) {
        surface->clip_rect = full_rect;
        return SDL_TRUE;
    }
    return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
}

int SDL_SetColorKey	(	SDL_Surface *	surface,
		int	flag,
		Uint32	key
	)

Sets the color key (transparent pixel) in a blittable surface.

Parameters

surface	The surface to update
flag	Non-zero to enable colorkey and 0 to disable colorkey
key	The transparent pixel in the native surface format

Returns

0 on success, or -1 if the surface is not valid

You can pass SDL_RLEACCEL to enable RLE accelerated blits.

Definition at line 190 of file SDL_surface.c.

References SDL_Color::a, SDL_BlitInfo::colorkey, SDL_Palette::colors, SDL_BlitInfo::flags, SDL_Surface::format, SDL_BlitMap::info, SDL_Surface::map, SDL_Palette::ncolors, SDL_PixelFormat::palette, SDL_ALPHA_OPAQUE, SDL_ALPHA_TRANSPARENT, SDL_COPY_COLORKEY, SDL_InvalidateMap(), SDL_InvalidParamError, SDL_RLEACCEL, SDL_SetSurfaceRLE(), and SDL_Palette::version.

Referenced by SDL_ConvertColorkeyToAlpha(), and SDL_ConvertSurface().

{
    int flags;

    if (!surface) {
        return SDL_InvalidParamError("surface");
    }

    if (surface->format->palette && key >= ((Uint32) surface->format->palette->ncolors)) {
        return SDL_InvalidParamError("key");
    }

    if (flag & SDL_RLEACCEL) {
        SDL_SetSurfaceRLE(surface, 1);
    }

    flags = surface->map->info.flags;
    if (flag) {
        surface->map->info.flags |= SDL_COPY_COLORKEY;
        surface->map->info.colorkey = key;
        if (surface->format->palette) {
            surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_TRANSPARENT;
            ++surface->format->palette->version;
            if (!surface->format->palette->version) {
                surface->format->palette->version = 1;
            }
        }
    } else {
        if (surface->format->palette) {
            surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_OPAQUE;
            ++surface->format->palette->version;
            if (!surface->format->palette->version) {
                surface->format->palette->version = 1;
            }
        }
        surface->map->info.flags &= ~SDL_COPY_COLORKEY;
    }
    if (surface->map->info.flags != flags) {
        SDL_InvalidateMap(surface->map);
    }

    return 0;
}

int SDL_SetSurfaceAlphaMod	(	SDL_Surface *	surface,
		Uint8	alpha
	)

Set an additional alpha value used in blit operations.

Parameters

surface	The surface to update.
alpha	The alpha value multiplied into blit operations.

Returns

0 on success, or -1 if the surface is not valid.

See also

SDL_GetSurfaceAlphaMod()

Definition at line 368 of file SDL_surface.c.

References SDL_BlitInfo::a, SDL_BlitInfo::flags, SDL_BlitMap::info, SDL_Surface::map, SDL_COPY_MODULATE_ALPHA, and SDL_InvalidateMap().

{
    int flags;

    if (!surface) {
        return -1;
    }

    surface->map->info.a = alpha;

    flags = surface->map->info.flags;
    if (alpha != 0xFF) {
        surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA;
    } else {
        surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
    }
    if (surface->map->info.flags != flags) {
        SDL_InvalidateMap(surface->map);
    }
    return 0;
}

int SDL_SetSurfaceBlendMode	(	SDL_Surface *	surface,
		SDL_BlendMode	blendMode
	)

Set the blend mode used for blit operations.

Parameters

surface	The surface to update.
blendMode	SDL_BlendMode to use for blit blending.

Returns

0 on success, or -1 if the parameters are not valid.

See also

SDL_GetSurfaceBlendMode()

Definition at line 404 of file SDL_surface.c.

References SDL_BlitInfo::flags, SDL_BlitMap::info, SDL_Surface::map, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BLENDMODE_MOD, SDL_BLENDMODE_NONE, SDL_COPY_ADD, SDL_COPY_BLEND, SDL_COPY_MOD, SDL_InvalidateMap(), and SDL_Unsupported.

Referenced by SDL_ConvertColorkeyToAlpha(), SDL_ConvertSurface(), and SDL_CreateRGBSurface().

{
    int flags, status;

    if (!surface) {
        return -1;
    }

    status = 0;
    flags = surface->map->info.flags;
    surface->map->info.flags &=
        ~(SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD);
    switch (blendMode) {
    case SDL_BLENDMODE_NONE:
        break;
    case SDL_BLENDMODE_BLEND:
        surface->map->info.flags |= SDL_COPY_BLEND;
        break;
    case SDL_BLENDMODE_ADD:
        surface->map->info.flags |= SDL_COPY_ADD;
        break;
    case SDL_BLENDMODE_MOD:
        surface->map->info.flags |= SDL_COPY_MOD;
        break;
    default:
        status = SDL_Unsupported();
        break;
    }

    if (surface->map->info.flags != flags) {
        SDL_InvalidateMap(surface->map);
    }

    return status;
}

int SDL_SetSurfaceColorMod	(	SDL_Surface *	surface,
		Uint8	r,
		Uint8	g,
		Uint8	b
	)

Set an additional color value used in blit operations.

Parameters

surface	The surface to update.
r	The red color value multiplied into blit operations.
g	The green color value multiplied into blit operations.
b	The blue color value multiplied into blit operations.

Returns

0 on success, or -1 if the surface is not valid.

See also

SDL_GetSurfaceColorMod()

Definition at line 323 of file SDL_surface.c.

References SDL_BlitInfo::b, SDL_BlitInfo::flags, SDL_BlitInfo::g, SDL_BlitMap::info, SDL_Surface::map, SDL_BlitInfo::r, SDL_COPY_MODULATE_COLOR, and SDL_InvalidateMap().

{
    int flags;

    if (!surface) {
        return -1;
    }

    surface->map->info.r = r;
    surface->map->info.g = g;
    surface->map->info.b = b;

    flags = surface->map->info.flags;
    if (r != 0xFF || g != 0xFF || b != 0xFF) {
        surface->map->info.flags |= SDL_COPY_MODULATE_COLOR;
    } else {
        surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
    }
    if (surface->map->info.flags != flags) {
        SDL_InvalidateMap(surface->map);
    }
    return 0;
}

int SDL_SetSurfacePalette	(	SDL_Surface *	surface,
		SDL_Palette *	palette
	)

Set the palette used by a surface.

Returns

0, or -1 if the surface format doesn't use a palette.

Note

A single palette can be shared with many surfaces.

Definition at line 155 of file SDL_surface.c.

References SDL_Surface::format, SDL_Surface::map, SDL_InvalidateMap(), SDL_SetError, and SDL_SetPixelFormatPalette.

Referenced by SDL_CreateRGBSurface(), and SDL_FreeSurface().

{
    if (!surface) {
        return SDL_SetError("SDL_SetSurfacePalette() passed a NULL surface");
    }
    if (SDL_SetPixelFormatPalette(surface->format, palette) < 0) {
        return -1;
    }
    SDL_InvalidateMap(surface->map);

    return 0;
}

int SDL_SetSurfaceRLE	(	SDL_Surface *	surface,
		int	flag
	)

Sets the RLE acceleration hint for a surface.

Returns

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.

Definition at line 169 of file SDL_surface.c.

References SDL_BlitInfo::flags, SDL_BlitMap::info, SDL_Surface::map, SDL_COPY_RLE_DESIRED, and SDL_InvalidateMap().

Referenced by SDL_ConvertSurface(), and SDL_SetColorKey().

{
    int flags;

    if (!surface) {
        return -1;
    }

    flags = surface->map->info.flags;
    if (flag) {
        surface->map->info.flags |= SDL_COPY_RLE_DESIRED;
    } else {
        surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED;
    }
    if (surface->map->info.flags != flags) {
        SDL_InvalidateMap(surface->map);
    }
    return 0;
}

void SDL_UnlockSurface

(

SDL_Surface *

surface

)

See also

SDL_LockSurface()

Definition at line 837 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::locked, SDL_RLEACCEL, and SDL_RLESurface().

Referenced by SDL_ConvertColorkeyToAlpha(), and SDL_FreeSurface().

{
    /* Only perform an unlock if we are locked */
    if (!surface->locked || (--surface->locked > 0)) {
        return;
    }

    /* Update RLE encoded surface with new data */
    if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
        surface->flags &= ~SDL_RLEACCEL;        /* stop lying */
        SDL_RLESurface(surface);
    }
}

int SDL_UpperBlit	(	SDL_Surface *	src,
		const SDL_Rect *	srcrect,
		SDL_Surface *	dst,
		SDL_Rect *	dstrect
	)

This is the public blit function, SDL_BlitSurface(), and it performs rectangle validation and clipping before passing it to SDL_LowerBlit()

Definition at line 536 of file SDL_surface.c.

References SDL_Surface::clip_rect, SDL_BlitInfo::flags, SDL_Rect::h, SDL_Surface::h, SDL_BlitMap::info, SDL_Surface::locked, SDL_Surface::map, NULL, SDL_COPY_NEAREST, SDL_InvalidateMap(), SDL_LowerBlit(), SDL_SetError, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

{
    SDL_Rect fulldst;
    int srcx, srcy, w, h;

    /* Make sure the surfaces aren't locked */
    if (!src || !dst) {
        return SDL_SetError("SDL_UpperBlit: passed a NULL surface");
    }
    if (src->locked || dst->locked) {
        return SDL_SetError("Surfaces must not be locked during blit");
    }

    /* If the destination rectangle is NULL, use the entire dest surface */
    if (dstrect == NULL) {
        fulldst.x = fulldst.y = 0;
        fulldst.w = dst->w;
        fulldst.h = dst->h;
        dstrect = &fulldst;
    }

    /* clip the source rectangle to the source surface */
    if (srcrect) {
        int maxw, maxh;

        srcx = srcrect->x;
        w = srcrect->w;
        if (srcx < 0) {
            w += srcx;
            dstrect->x -= srcx;
            srcx = 0;
        }
        maxw = src->w - srcx;
        if (maxw < w)
            w = maxw;

        srcy = srcrect->y;
        h = srcrect->h;
        if (srcy < 0) {
            h += srcy;
            dstrect->y -= srcy;
            srcy = 0;
        }
        maxh = src->h - srcy;
        if (maxh < h)
            h = maxh;

    } else {
        srcx = srcy = 0;
        w = src->w;
        h = src->h;
    }

    /* clip the destination rectangle against the clip rectangle */
    {
        SDL_Rect *clip = &dst->clip_rect;
        int dx, dy;

        dx = clip->x - dstrect->x;
        if (dx > 0) {
            w -= dx;
            dstrect->x += dx;
            srcx += dx;
        }
        dx = dstrect->x + w - clip->x - clip->w;
        if (dx > 0)
            w -= dx;

        dy = clip->y - dstrect->y;
        if (dy > 0) {
            h -= dy;
            dstrect->y += dy;
            srcy += dy;
        }
        dy = dstrect->y + h - clip->y - clip->h;
        if (dy > 0)
            h -= dy;
    }

    /* Switch back to a fast blit if we were previously stretching */
    if (src->map->info.flags & SDL_COPY_NEAREST) {
        src->map->info.flags &= ~SDL_COPY_NEAREST;
        SDL_InvalidateMap(src->map);
    }

    if (w > 0 && h > 0) {
        SDL_Rect sr;
        sr.x = srcx;
        sr.y = srcy;
        sr.w = dstrect->w = w;
        sr.h = dstrect->h = h;
        return SDL_LowerBlit(src, &sr, dst, dstrect);
    }
    dstrect->w = dstrect->h = 0;
    return 0;
}

int SDL_UpperBlitScaled	(	SDL_Surface *	src,
		const SDL_Rect *	srcrect,
		SDL_Surface *	dst,
		SDL_Rect *	dstrect
	)

This is the public scaled blit function, SDL_BlitScaled(), and it performs rectangle validation and clipping before passing it to SDL_LowerBlitScaled()

Definition at line 635 of file SDL_surface.c.

References SDL_Surface::clip_rect, SDL_Rect::h, SDL_Surface::h, SDL_Surface::locked, NULL, SDL_BlitSurface, SDL_floor, SDL_LowerBlitScaled(), SDL_SetError, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

{
    double src_x0, src_y0, src_x1, src_y1;
    double dst_x0, dst_y0, dst_x1, dst_y1;
    SDL_Rect final_src, final_dst;
    double scaling_w, scaling_h;
    int src_w, src_h;
    int dst_w, dst_h;

    /* Make sure the surfaces aren't locked */
    if (!src || !dst) {
        return SDL_SetError("SDL_UpperBlitScaled: passed a NULL surface");
    }
    if (src->locked || dst->locked) {
        return SDL_SetError("Surfaces must not be locked during blit");
    }

    if (NULL == srcrect) {
        src_w = src->w;
        src_h = src->h;
    } else {
        src_w = srcrect->w;
        src_h = srcrect->h;
    }

    if (NULL == dstrect) {
        dst_w = dst->w;
        dst_h = dst->h;
    } else {
        dst_w = dstrect->w;
        dst_h = dstrect->h;
    }

    if (dst_w == src_w && dst_h == src_h) {
        /* No scaling, defer to regular blit */
        return SDL_BlitSurface(src, srcrect, dst, dstrect);
    }

    scaling_w = (double)dst_w / src_w;
    scaling_h = (double)dst_h / src_h;

    if (NULL == dstrect) {
        dst_x0 = 0;
        dst_y0 = 0;
        dst_x1 = dst_w - 1;
        dst_y1 = dst_h - 1;
    } else {
        dst_x0 = dstrect->x;
        dst_y0 = dstrect->y;
        dst_x1 = dst_x0 + dst_w - 1;
        dst_y1 = dst_y0 + dst_h - 1;
    }

    if (NULL == srcrect) {
        src_x0 = 0;
        src_y0 = 0;
        src_x1 = src_w - 1;
        src_y1 = src_h - 1;
    } else {
        src_x0 = srcrect->x;
        src_y0 = srcrect->y;
        src_x1 = src_x0 + src_w - 1;
        src_y1 = src_y0 + src_h - 1;

        /* Clip source rectangle to the source surface */

        if (src_x0 < 0) {
            dst_x0 -= src_x0 * scaling_w;
            src_x0 = 0;
        }

        if (src_x1 >= src->w) {
            dst_x1 -= (src_x1 - src->w + 1) * scaling_w;
            src_x1 = src->w - 1;
        }

        if (src_y0 < 0) {
            dst_y0 -= src_y0 * scaling_h;
            src_y0 = 0;
        }

        if (src_y1 >= src->h) {
            dst_y1 -= (src_y1 - src->h + 1) * scaling_h;
            src_y1 = src->h - 1;
        }
    }

    /* Clip destination rectangle to the clip rectangle */

    /* Translate to clip space for easier calculations */
    dst_x0 -= dst->clip_rect.x;
    dst_x1 -= dst->clip_rect.x;
    dst_y0 -= dst->clip_rect.y;
    dst_y1 -= dst->clip_rect.y;

    if (dst_x0 < 0) {
        src_x0 -= dst_x0 / scaling_w;
        dst_x0 = 0;
    }

    if (dst_x1 >= dst->clip_rect.w) {
        src_x1 -= (dst_x1 - dst->clip_rect.w + 1) / scaling_w;
        dst_x1 = dst->clip_rect.w - 1;
    }

    if (dst_y0 < 0) {
        src_y0 -= dst_y0 / scaling_h;
        dst_y0 = 0;
    }

    if (dst_y1 >= dst->clip_rect.h) {
        src_y1 -= (dst_y1 - dst->clip_rect.h + 1) / scaling_h;
        dst_y1 = dst->clip_rect.h - 1;
    }

    /* Translate back to surface coordinates */
    dst_x0 += dst->clip_rect.x;
    dst_x1 += dst->clip_rect.x;
    dst_y0 += dst->clip_rect.y;
    dst_y1 += dst->clip_rect.y;

    final_src.x = (int)SDL_floor(src_x0 + 0.5);
    final_src.y = (int)SDL_floor(src_y0 + 0.5);
    final_src.w = (int)SDL_floor(src_x1 - src_x0 + 1.5);
    final_src.h = (int)SDL_floor(src_y1 - src_y0 + 1.5);

    final_dst.x = (int)SDL_floor(dst_x0 + 0.5);
    final_dst.y = (int)SDL_floor(dst_y0 + 0.5);
    final_dst.w = (int)SDL_floor(dst_x1 - dst_x0 + 1.5);
    final_dst.h = (int)SDL_floor(dst_y1 - dst_y0 + 1.5);

    if (final_dst.w < 0)
        final_dst.w = 0;
    if (final_dst.h < 0)
        final_dst.h = 0;

    if (dstrect)
        *dstrect = final_dst;

    if (final_dst.w == 0 || final_dst.h == 0 ||
        final_src.w <= 0 || final_src.h <= 0) {
        /* No-op. */
        return 0;
    }

    return SDL_LowerBlitScaled(src, &final_src, dst, &final_dst);
}