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annotate dox/define_backend.h @ 1160:1a699dc00fa3

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Fix the issue of not removing node in old scene when switching scenes. - When a timeline is playing and crossing two scenes (tween block), nodes, for the old scene, in duplicate group must be removed. But, it is not. - It is fixed by checking if nodes, in the duplicate group, are also in the key frame next to the new scene. All nodes that is not in next key frame are remove.
author Thinker K.F. Li <thinker@codemud.net>
date Tue, 28 Dec 2010 13:35:34 +0800
parents 5dedeedf0408
children
rev   line source
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1f900a67bd38 Doc How to Define a Backend
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1 /*! \page backend How to Define a Backend
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2 *
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3 * A backend is factory to initialize environment to make
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4 * MadBufferfly available. A backend should provide resources
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5 * needed by MadButterfly, for example, to provide a surface
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6 * that will show everything drawing on it. It also translate and
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7 * relay input events, mouse or keyboard, to MadButterfly.
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8 * The tasks that a backend should do are listed following,
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9 * - tranlsate and relay mouse events to MadButterfly.
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10 * - to provide
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11 * - *_MB_new()/*_MB_free function to create and free a runtime.
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12 * - prepare a backend surface,
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13 * - prepare a front surface,
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14 * - *_MB_kbevents() to return a subject, for keyboard
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15 * events, associated with a runtime.
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16 * - translate and relay keyboard events to MadButterfly,
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17 * - *_MB_tman() to return a timer manager associated with
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18 * a runtime.
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19 * - to handle a timer, and relay timeout events to MadButterfly.
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20 * - *_MB_ob_factory() to return an observer factory.
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21 * - *_MB_img_ldr() to return an image loader.
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22 *
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23 * \section backend_mb_new_n_free *_MB_new()/*_MB_free()
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24 *
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25 * MadButterfly supposes that application programmers may create more
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26 * than one instance of MadButterfly to draw mutliple windows for an
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27 * application. So, we need you, backend developer, to provide a
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28 * *_MB_new()/*_MB_free() to create/free an instance respective.
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29 *
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30 * *_MB_new() should return an *_MB_runtime_t object to keep states of
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31 * an instance. The definition of *_MB_runtime_t is up to backend
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32 * developers.
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33 *
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34 * For each *_MB_runtime_t, backend should create a redraw manager,
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35 * a.k.a rdman, by calling malloc() and redraw_man_init(). For each
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36 * rdman, you should give it one or two surfaces. Rdman draws shapes
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37 * on first one, called 'cr' (should be changed), as an off-screen
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38 * buffer and copy it to 2nd one, called 'backend' surface, as an
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39 * on-screen buffer. For X, the 'backend' should be a window surface.
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40 * The reason of two surfaces are to prevent user from seeing
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41 * intermediate result of drawing procedure. You can also pass a NULL
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42 * pointer for 2nd surface if you dont care intermediate result, HW
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43 * accelerator is fast enough, or with HW dobule buffering.
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44 *
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45 * \section backend_kbevents Keyboard Events
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46 *
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47 * *_MB_kbevents() returns a subject (\see
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48 * http://en.wikipedia.org/wiki/Observer_pattern). Applications want
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49 * to receive keyboard events would register an observer on this
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50 * subject. A backend should translate keyboard events for
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51 * MadButterfly, and notify observers of this subject.
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52 * Subject-observer had implemented by MadBuffery.
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53 *
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54 * \section backend_timer Timer
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55 *
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56 * *_MB_tman() should return a timer manager, with type of mb_tman_t.
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57 * When an application want to get notified at some time later, it
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58 * would register a callback with the mb_tman_t. A backend should
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59 * call mb_tman_handle_timeout() at proper time. You can call
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60 * mb_tman_next_timeout() to get the time to call
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61 * mb_tman_handle_timeout() for next timeout. For nodejs or other
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62 * binding that has their-owned timer, you can skip *_MB_tman(). But,
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63 * C code need this one.
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64 *
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65 * \section backend_obfactory Observer Factory
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66 *
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67 * *_MB_ob_factory() returns an observer factory, ob_factory_t. It is
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68 * reponsible for creation of observers. Applications call observer
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69 * to allocate and free observers and subjects. ob_factory_t is
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70 * defined in mb_observer.h, there are 5 function pointers in it. You
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71 * can use functions of default implementation instead of new ones.
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72 *
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73 * \section backend_img_ldr Image Loader
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74 *
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75 * *_MB_img_ldr() returns an image loader, mb_img_ldr_t. A backend
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76 * developer can use the default implementation. He can also
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77 * implement a new one, but it should implement the interface defined
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78 * by mb_img_ldr_t and mb_img_data_t.
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79 *
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80 * \section backend_mouse_events Mouse Events
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81 *
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82 * A backend should also translate and relay mouse events to
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83 * MadButterfly. The mouse events should be dispatched by notifing
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84 * observers of the subject of a coord or shape of an rdman. The
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85 * backend developers can check handle_single_x_event() in X_supp.c
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86 * for how to dispatch mouse events.
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87 *
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88 * \see X_supp.c
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89 */