SDL_rotozoom.h

   1
   2 /*
   3
   4  SDL_rotozoom - rotozoomer
   5
   6  LGPL (c) A. Schiffler
   7
   8 */
   9
  10 #ifndef _SDL_rotozoom_h
  11 #define _SDL_rotozoom_h
  12
  13 #include <math.h>
  14
  15 /* Set up for C function definitions, even when using C++ */
  16 #ifdef __cplusplus
  17 extern "C" {
  18 #endif
  19
  20 #ifndef M_PI
  21 #define M_PI    3.141592654
  22 #endif
  23
  24 #include <SDL/SDL.h>
  25
  26 /* ---- Defines */
  27
  28 #define SMOOTHING_OFF           0
  29 #define SMOOTHING_ON            1
  30
  31 /* ---- Structures */
  32
  33     typedef struct tColorRGBA {
  34         Uint8 r;
  35         Uint8 g;
  36         Uint8 b;
  37         Uint8 a;
  38     } tColorRGBA;
  39
  40     typedef struct tColorY {
  41         Uint8 y;
  42     } tColorY;
  43
  44
  45 /* ---- Prototypes */
  46
  47 #ifdef WIN32
  48 #ifdef BUILD_DLL
  49 #define DLLINTERFACE __declspec(dllexport)
  50 #else
  51 #define DLLINTERFACE __declspec(dllimport)
  52 #endif
  53 #else
  54 #define DLLINTERFACE
  55 #endif
  56
  57 /*
  58
  59  rotozoomSurface()
  60
  61  Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
  62  'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
  63  then the destination 32bit surface is anti-aliased. If the surface is not 8bit
  64  or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
  65
  66 */
  67
  68     DLLINTERFACE SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
  69
  70     DLLINTERFACE SDL_Surface *rotozoomSurfaceXY
  71     (SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth);
  72
  73 /* Returns the size of the target surface for a rotozoomSurface() call */
  74
  75     DLLINTERFACE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth,
  76                                           int *dstheight);
  77
  78     DLLINTERFACE void rotozoomSurfaceSizeXY
  79     (int width, int height, double angle, double zoomx, double zoomy,
  80      int *dstwidth, int *dstheight);
  81
  82 /*
  83
  84  zoomSurface()
  85
  86  Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
  87  'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
  88  then the destination 32bit surface is anti-aliased. If the surface is not 8bit
  89  or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
  90
  91 */
  92
  93     DLLINTERFACE SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
  94
  95 /* Returns the size of the target surface for a zoomSurface() call */
  96
  97     DLLINTERFACE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);
  98
  99
 100 /*
 101     shrinkSurface()
 102
 103     Shrinks a 32bit or 8bit 'src' surface ti a newly created 'dst' surface.
 104     'factorx' and 'factory' are the shrinking ratios (i.e. 2=1/2 the size,
 105     3=1/3 the size, etc.) The destination surface is antialiased by averaging
 106     the source box RGBA or Y information. If the surface is not 8bit
 107     or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
 108 */
 109
 110     DLLINTERFACE SDL_Surface *shrinkSurface(SDL_Surface * src, int factorx, int factory);
 111
 112 /*
 113
 114     Other functions
 115
 116 */
 117
 118     DLLINTERFACE SDL_Surface* rotateSurface90Degrees(SDL_Surface* pSurf, int numClockwiseTurns);
 119
 120 /* Ends C function definitions when using C++ */
 121 #ifdef __cplusplus
 122 }
 123 #endif
 124
 125 #endif                          /* _SDL_rotozoom_h */