Rev Author Line No. Line
23 ovan 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.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 /* Ends C function definitions when using C++ */
101 #ifdef __cplusplus
102 }
103 #endif
104  
105 #endif                          /* _SDL_rotozoom_h */