SDL_rotozoom.h

/*
 * SDL_rotozoom - rotozoomer
 *
 * LGPL (c) A. Schiffler
 *
 */

#ifndef DEF_SDL_ROTOZOOM_H
#define DEF_SDL_ROTOZOOM_H

#ifndef M_PI
#define M_PI    3.141592654
#endif

#define SMOOTHING_OFF           0
#define SMOOTHING_ON            1

typedef struct tColorRGBA {
        Uint8 r;
        Uint8 g;
        Uint8 b;
        Uint8 a;
} tColorRGBA;

typedef struct tColorY {
        Uint8 y;
} tColorY;


/* 
 * rotozoomSurface()
 *
 * Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
 * 'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
 * then the destination 32bit surface is anti-aliased. If the surface is not 8bit
 * or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
 */

SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
SDL_Surface *rotozoomSurfaceXY (SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth);

/* Returns the size of the target surface for a rotozoomSurface() call */

void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth, int *dstheight);
void rotozoomSurfaceSizeXY(int width, int height, double angle, double zoomx, double zoomy, int *dstwidth, int *dstheight);

/* 
 * zoomSurface()
 *
 * Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
 * 'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
 * then the destination 32bit surface is anti-aliased. If the surface is not 8bit
 * or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
 */

SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);

/* Returns the size of the target surface for a zoomSurface() call */

void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);

#endif

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