1 /* 2 3 SDL2_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces 4 5 Copyright (C) 2001-2012 Andreas Schiffler 6 7 This software is provided 'as-is', without any express or implied 8 warranty. In no event will the authors be held liable for any damages 9 arising from the use of this software. 10 11 Permission is granted to anyone to use this software for any purpose, 12 including commercial applications, and to alter it and redistribute it 13 freely, subject to the following restrictions: 14 15 1. The origin of this software must not be misrepresented; you must not 16 claim that you wrote the original software. If you use this software 17 in a product, an acknowledgment in the product documentation would be 18 appreciated but is not required. 19 20 2. Altered source versions must be plainly marked as such, and must not be 21 misrepresented as being the original software. 22 23 3. This notice may not be removed or altered from any source 24 distribution. 25 26 Andreas Schiffler -- aschiffler at ferzkopp dot net 27 28 */ 29 30 #ifndef _SDL2_rotozoom_h 31 #define _SDL2_rotozoom_h 32 33 #include <math.h> 34 35 /* Set up for C function definitions, even when using C++ */ 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 #ifndef M_PI 41 #define M_PI 3.1415926535897932384626433832795 42 #endif 43 44 #include "SDL.h" 45 46 /* ---- Defines */ 47 48 /*! 49 \brief Disable anti-aliasing (no smoothing). 50 */ 51 #define SMOOTHING_OFF 0 52 53 /*! 54 \brief Enable anti-aliasing (smoothing). 55 */ 56 #define SMOOTHING_ON 1 57 58 /* ---- Function Prototypes */ 59 60 #ifdef _MSC_VER 61 # if defined(DLL_EXPORT) && !defined(LIBSDL2_GFX_DLL_IMPORT) 62 # define SDL2_ROTOZOOM_SCOPE __declspec(dllexport) 63 # else 64 # ifdef LIBSDL2_GFX_DLL_IMPORT 65 # define SDL2_ROTOZOOM_SCOPE __declspec(dllimport) 66 # endif 67 # endif 68 #endif 69 #ifndef SDL2_ROTOZOOM_SCOPE 70 # define SDL2_ROTOZOOM_SCOPE extern 71 #endif 72 73 /* 74 75 Rotozoom functions 76 77 */ 78 79 SDL2_ROTOZOOM_SCOPE SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth); 80 81 SDL2_ROTOZOOM_SCOPE SDL_Surface *rotozoomSurfaceXY 82 (SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth); 83 84 85 SDL2_ROTOZOOM_SCOPE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth, 86 int *dstheight); 87 88 SDL2_ROTOZOOM_SCOPE void rotozoomSurfaceSizeXY 89 (int width, int height, double angle, double zoomx, double zoomy, 90 int *dstwidth, int *dstheight); 91 92 /* 93 94 Zooming functions 95 96 */ 97 98 SDL2_ROTOZOOM_SCOPE SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth); 99 100 SDL2_ROTOZOOM_SCOPE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight); 101 102 /* 103 104 Shrinking functions 105 106 */ 107 108 SDL2_ROTOZOOM_SCOPE SDL_Surface *shrinkSurface(SDL_Surface * src, int factorx, int factory); 109 110 /* 111 112 Specialized rotation functions 113 114 */ 115 116 SDL2_ROTOZOOM_SCOPE SDL_Surface* rotateSurface90Degrees(SDL_Surface* src, int numClockwiseTurns); 117 118 /* Ends C function definitions when using C++ */ 119 #ifdef __cplusplus 120 } 121 #endif 122 123 #endif /* _SDL2_rotozoom_h */ 124