src/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 /*
  48
  49  rotozoomSurface()
  50
  51  Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
  52  'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
  53  then the destination 32bit surface is anti-aliased. If the surface is not 8bit
  54  or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
  55
  56 */
  57
  58      SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
  59
  60      SDL_Surface *rotozoomSurfaceXY
  61     (SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth);
  62
  63 /* Returns the size of the target surface for a rotozoomSurface() call */
  64
  65      void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth,
  66                                           int *dstheight);
  67
  68      void rotozoomSurfaceSizeXY
  69     (int width, int height, double angle, double zoomx, double zoomy,
  70      int *dstwidth, int *dstheight);
  71
  72 /*
  73
  74  zoomSurface()
  75
  76  Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
  77  'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
  78  then the destination 32bit surface is anti-aliased. If the surface is not 8bit
  79  or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
  80
  81 */
  82
  83      SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
  84
  85 /* Returns the size of the target surface for a zoomSurface() call */
  86
  87      void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);
  88
  89
  90 /*
  91     shrinkSurface()
  92
  93     Shrinks a 32bit or 8bit 'src' surface ti a newly created 'dst' surface.
  94     'factorx' and 'factory' are the shrinking ratios (i.e. 2=1/2 the size,
  95     3=1/3 the size, etc.) The destination surface is antialiased by averaging
  96     the source box RGBA or Y information. If the surface is not 8bit
  97     or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
  98 */
  99
 100      SDL_Surface *shrinkSurface(SDL_Surface * src, int factorx, int factory);
 101
 102 /*
 103
 104     Other functions
 105
 106 */
 107
 108      SDL_Surface* rotateSurface90Degrees(SDL_Surface* pSurf, int numClockwiseTurns);
 109
 110 /* Ends C function definitions when using C++ */
 111 #ifdef __cplusplus
 112 }
 113 #endif
 114
 115 #endif                          /* _SDL_rotozoom_h */