gfm.sdl2.sdlimage source code

1 module gfm.sdl2.sdlimage;
2 
3 import std..string;
4 
5 import derelict.util.exception,
6        derelict.sdl2.sdl,
7        derelict.sdl2.image;
8 
9 static if( __VERSION__ >= 2067 )
10     import std.experimental.logger;
11 else
12     import std.historical.logger;
13 
14 import gfm.sdl2.sdl,
15        gfm.sdl2.surface;
16 
17 /// Load images using SDL_image, a SDL companion library able to load various image formats.
18 final class SDLImage
19 {
20     public
21     {
22         /// Loads the SDL_image library.
23         /// SDL must be already initialized.
24         /// Throws: $(D SDL2Exception) on error.
25         this(SDL2 sdl2, int flags = IMG_INIT_JPG | IMG_INIT_PNG | IMG_INIT_TIF | IMG_INIT_WEBP)
26         {
27             _sdl2 = sdl2; // force loading of SDL first
28             _logger = sdl2._logger;
29             _SDLImageInitialized = false;
30 
31             try
32             {
33                 DerelictSDL2Image.load();
34             }
35             catch(DerelictException e)
36             {
37                 throw new SDL2Exception(e.msg);
38             }
39 
40             int inited = IMG_Init(flags);
41             _SDLImageInitialized = true;
42         }
43 
44         /// Releases the SDL resource.
45         ~this()
46         {
47             if (_SDLImageInitialized)
48             {
49                 debug ensureNotInGC("SDLImage");
50                 _SDLImageInitialized = false;
51                 IMG_Quit();
52             }
53         }
54         deprecated("Use .destroy instead") void close(){}
55 
56         /// Load an image.
57         /// Returns: A SDL surface with loaded content.
58         /// Throws: $(D SDL2Exception) on error.
59         SDL2Surface load(string path)
60         {
61             immutable(char)* pathz = toStringz(path);
62             SDL_Surface* surface = IMG_Load(pathz);
63             if (surface is null)
64                 throwSDL2ImageException("IMG_Load");
65 
66             return new SDL2Surface(_sdl2, surface, SDL2Surface.Owned.YES);
67         }
68     }
69 
70     private
71     {
72         Logger _logger;
73         SDL2 _sdl2;
74         bool _SDLImageInitialized;
75 
76         void throwSDL2ImageException(string callThatFailed)
77         {
78             string message = format("%s failed: %s", callThatFailed, getErrorString());
79             throw new SDL2Exception(message);
80         }
81 
82         const(char)[] getErrorString()
83         {
84             return fromStringz(IMG_GetError());
85         }
86     }
87 }