SDL2_rotozoom.h
Go to the documentation of this file.
/*
SDL2_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces
Copyright (C) 2012-2014 Andreas Schiffler
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.
Andreas Schiffler -- aschiffler at ferzkopp dot net
*/
#ifndef _SDL2_rotozoom_h
#define _SDL2_rotozoom_h
#include <math.h>
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795
#endif
#include "SDL.h"
/* ---- Defines */
#define SMOOTHING_OFF 0
#define SMOOTHING_ON 1
/* ---- Function Prototypes */
#ifdef _MSC_VER
# if defined(DLL_EXPORT) && !defined(LIBSDL2_GFX_DLL_IMPORT)
# define SDL2_ROTOZOOM_SCOPE __declspec(dllexport)
# else
# ifdef LIBSDL2_GFX_DLL_IMPORT
# define SDL2_ROTOZOOM_SCOPE __declspec(dllimport)
# endif
# endif
#endif
#ifndef SDL2_ROTOZOOM_SCOPE
# define SDL2_ROTOZOOM_SCOPE extern
#endif
/*
Rotozoom functions
*/
SDL2_ROTOZOOM_SCOPE SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
SDL2_ROTOZOOM_SCOPE SDL_Surface *rotozoomSurfaceXY
(SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth);
SDL2_ROTOZOOM_SCOPE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth,
int *dstheight);
SDL2_ROTOZOOM_SCOPE void rotozoomSurfaceSizeXY
(int width, int height, double angle, double zoomx, double zoomy,
int *dstwidth, int *dstheight);
/*
Zooming functions
*/
SDL2_ROTOZOOM_SCOPE SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
SDL2_ROTOZOOM_SCOPE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);
/*
Shrinking functions
*/
SDL2_ROTOZOOM_SCOPE SDL_Surface *shrinkSurface(SDL_Surface * src, int factorx, int factory);
/*
Specialized rotation functions
*/
SDL2_ROTOZOOM_SCOPE SDL_Surface* rotateSurface90Degrees(SDL_Surface* src, int numClockwiseTurns);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#endif /* _SDL2_rotozoom_h */
rotozoomSurface
SDL2_ROTOZOOM_SCOPE SDL_Surface * rotozoomSurface(SDL_Surface *src, double angle, double zoom, int smooth)
Rotates and zooms a surface and optional anti-aliasing.
Definition SDL2_rotozoom.c:1035
rotozoomSurfaceXY
SDL2_ROTOZOOM_SCOPE SDL_Surface * rotozoomSurfaceXY(SDL_Surface *src, double angle, double zoomx, double zoomy, int smooth)
Rotates and zooms a surface with different horizontal and vertival scaling factors and optional anti-...
Definition SDL2_rotozoom.c:1056
zoomSurfaceSize
SDL2_ROTOZOOM_SCOPE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight)
Calculates the size of the target surface for a zoomSurface() call.
Definition SDL2_rotozoom.c:1311
zoomSurface
SDL2_ROTOZOOM_SCOPE SDL_Surface * zoomSurface(SDL_Surface *src, double zoomx, double zoomy, int smooth)
Zoom a surface by independent horizontal and vertical factors with optional smoothing.
Definition SDL2_rotozoom.c:1361
rotozoomSurfaceSize
SDL2_ROTOZOOM_SCOPE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth, int *dstheight)
Returns the size of the resulting target surface for a rotozoomSurface() call.
Definition SDL2_rotozoom.c:1013
rotozoomSurfaceSizeXY
SDL2_ROTOZOOM_SCOPE void rotozoomSurfaceSizeXY(int width, int height, double angle, double zoomx, double zoomy, int *dstwidth, int *dstheight)
Returns the size of the resulting target surface for a rotozoomSurfaceXY() call.
Definition SDL2_rotozoom.c:996
SDL2_ROTOZOOM_SCOPE
#define SDL2_ROTOZOOM_SCOPE
Definition SDL2_rotozoom.h:70
shrinkSurface
SDL2_ROTOZOOM_SCOPE SDL_Surface * shrinkSurface(SDL_Surface *src, int factorx, int factory)
Shrink a surface by an integer ratio using averaging.
Definition SDL2_rotozoom.c:1512
rotateSurface90Degrees
SDL2_ROTOZOOM_SCOPE SDL_Surface * rotateSurface90Degrees(SDL_Surface *src, int numClockwiseTurns)
Rotates a 8/16/24/32 bit surface in increments of 90 degrees.
Definition SDL2_rotozoom.c:803