118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
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/*
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SDL_rotozoom - rotozoomer
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LGPL (c) A. Schiffler
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*/
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#ifndef _SDL_rotozoom_h
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#define _SDL_rotozoom_h
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#include <math.h>
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef M_PI
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#define M_PI 3.141592654
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#endif
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#include "SDL.h"
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/* ---- Defines */
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#define SMOOTHING_OFF 0
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#define SMOOTHING_ON 1
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/* ---- Structures */
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typedef struct tColorRGBA {
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Uint8 r;
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Uint8 g;
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Uint8 b;
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Uint8 a;
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} tColorRGBA;
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typedef struct tColorY {
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Uint8 y;
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} tColorY;
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/* ---- Prototypes */
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#define DLLINTERFACE
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/*
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rotozoomSurface()
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Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
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'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
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then the destination 32bit surface is anti-aliased. If the surface is not 8bit
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or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
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*/
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DLLINTERFACE SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
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DLLINTERFACE SDL_Surface *rotozoomSurfaceXY
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(SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth);
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/* Returns the size of the target surface for a rotozoomSurface() call */
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DLLINTERFACE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth,
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int *dstheight);
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DLLINTERFACE void rotozoomSurfaceSizeXY
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(int width, int height, double angle, double zoomx, double zoomy,
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int *dstwidth, int *dstheight);
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/*
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zoomSurface()
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Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
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'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
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then the destination 32bit surface is anti-aliased. If the surface is not 8bit
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or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
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*/
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DLLINTERFACE SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
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/* Returns the size of the target surface for a zoomSurface() call */
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DLLINTERFACE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);
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/*
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shrinkSurface()
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Shrinks a 32bit or 8bit 'src' surface ti a newly created 'dst' surface.
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'factorx' and 'factory' are the shrinking ratios (i.e. 2=1/2 the size,
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3=1/3 the size, etc.) The destination surface is antialiased by averaging
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the source box RGBA or Y information. If the surface is not 8bit
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or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
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*/
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DLLINTERFACE SDL_Surface *shrinkSurface(SDL_Surface * src, int factorx, int factory);
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/*
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Other functions
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*/
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DLLINTERFACE SDL_Surface* rotateSurface90Degrees(SDL_Surface* pSurf, int numClockwiseTurns);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SDL_rotozoom_h */
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