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