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author Thinker K.F. Li <thinker@codemud.net>
date Mon, 20 Sep 2010 22:43:43 +0800
parents 099d6f26dc05
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rev   line source
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1 /*! \page android Integrate MadButterfly with Android
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2 *
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3 * I think almost all technical guys know Android, the mobile OS
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4 * project from Google. Once I know Android, my first idea is it is
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5 * cool if Android programmers can be powered by MadButterfly.
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6 * MadButterfly is very feasible for a lot of programs running on
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7 * devices that Android be targeted for. This document is about how
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8 * the MadButterfly is integrated with Android and power Android
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9 * applications.
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10 *
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11 * \section android_jni Android Native Code
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12 *
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13 * Android applications are actually Java code running on Dalvik VM.
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14 * Although, Java bytecode was translated into Dalvik bytecode. JNI
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15 * is the bridge of bytecode and native code. Bytecode and native
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16 * code can access each other through JNI interface. So, we must
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17 * implement a set of JNI native function as the channel for
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18 * communication between Android applications and MadButterfly.
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19 * Following image is how the MadButterfly integrated with the
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20 * Android.
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21 *
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22 * \image html Android-int.png
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23 *
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24 * MB JNI is a set of JNI native static methods that expose
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25 * MadButterfly functions to Java code. Java application can call
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26 * native static methods of MB JNI to access functions provided by
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27 * MadButterfly.
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28 *
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29 * Android applications draw everything on Canvas obects (backed by a
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30 * surface). A canvas is actually a wrapper for a SkCanvas of Skia.
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31 * Drawing on a Canvas object means drawing on a SkCanvas object. To
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32 * draw on the screen, MadButterfly draws on the SkCanvas.
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33 *
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34 * The idea is to make MadButterfly as a View of Android UI.
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35 * SurfaceView is extended as MBView; the sub-type of View for showing
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36 * graphics generated by MadButterfly. The SurfaceView own a surface.
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37 * The surface is passed to MadButterfly as a SurfaceHolder. MB JNI
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38 * can get Canvas objects from the SurfaceHolder, and get associated
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39 * SkCanvas in turn. With SkCanvas objects, MadButterfly can draw for
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40 * the MBView object.
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41 *
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42 * \section android_mem Memory Management for Android JNI Interface
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43 *
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44 * Some memory allocated and returned by MadButterfly should be
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45 * managed by the application. These memory blocks should not be
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46 * freed until they are no more used by MadButterfly engine. It means
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47 * Android applications reponsible for managing memory blocks. To
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48 * simplify implmentation of MB JNI, MB JNI always return the address
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49 * of an allocated objects as a Java integer. Java code should
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50 * take care about these addresses, and call proper functions for
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51 * freeing objects specified by addresses at right time.
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52 *
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53 * A Java side framework should be designed to easy the work of
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54 * Android application programmers. The framework should take care of
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55 * tracking life-cycle of MadButterfly objects. The namespace of the
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56 * framework is 'org.madbutterfly'.
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57 *
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58 * \section android_jni _jni
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59 *
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60 * org.madbutterfly._jni class is the placeholder to collect JNI
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61 * native methods for all MadButterfly functions. All methods of _jni
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62 * are static. A method usually maps to a MadButterfly function. For
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63 * example, rdman_coord_new() mapes to the MadButterfly function with
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64 * the same name.
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65 *
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66 * The object returned by a MadButterfly function, for ex. returned
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67 * value of rdman_coord_new(), is casted to a int, the address of the
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68 * object. So, type of an argument or return value of an object is
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69 * declared as a int. For example,
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70 * \code
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71 * class _jni {
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72 * native static int rdman_coord_new(void);
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73 * }
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74 * \endcode
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75 * Java code should keep these integers carefully for maintaining
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76 * life-cycle of objects.
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77 *
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78 * MadButterfly provides only initial function for some objects,
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79 * application should allocate memory for these function by them-self.
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80 * For these function, a new JNI native method are used instead of
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81 * initial function. The new JNI method is responsible for allocating
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82 * memory and calling initial function. For example, redraw_man_new()
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83 * is defined as a JNI method instead of redraw_man_init().
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84 * \code
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85 * native static int redraw_man_new(Canvas cr, Canvas backend);
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86 * \endcode
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87 * First argument, rdman, of redraw_man_init() is replaced by a int
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88 * returned value of redraw_man_new(). cr and backend, mbe_t type by
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89 * MadButterfly, are, now, Canvas type by the JNI native method. The
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90 * implementation of the JNI native mothod would retrieves the
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91 * SkCanvas object, and casts it to mbe_t type.
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92 *
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93 * \section android_java_mb Java Likes MadButterfly
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94 *
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95 * Managing life-cycle for MadButterfly objects is not Java likes.
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96 * To provie a Java style interface for MadButterfly, a framework to
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97 * hide underlying life-cycle management is requried. Life-cycle is
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98 * one major responsibility of the framework, it should keep integers
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99 * of addresses of objects and free the associated resources with
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100 * correct JNI methods and at right time.
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101 *
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102 * For example, org.madbutterfly.redraw_man is the respective Java
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103 * class of redraw_man_t of MadButterfly engine. redraw_man has a
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104 * private member variable redraw_man._rdman_addr. It is the address
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105 * of the respective redraw_man_t object of MadButterfly. redraw_man
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106 * would call _jni.redraw_man_destroy() to release associated
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107 * resources and free the memory before it being recycled. So,
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108 * redraw_man.finalize() is defined for releasing resources. It would
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109 * be called before a redraw_man object being recycled.
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110 *
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111 * \section android_MBView MBView for Android MBView extends
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112 *
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113 * SurfaceView is a sub-class of View provided by Android. MBView
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114 * inherits SurfaceView to implement a View controlled by
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115 * MadButterfly. A MBView object owns a redraw_man, a.k.a
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116 * redraw_man_t of MadButterfly. Android application programmers
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117 * works on redraw_man to manipulate MadButterfly and changes content
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118 * showed by the MBView object. Android applications call
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119 * MBView.get_rdman() to retrieve the redraw_man object assocaited
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120 * with a MBView object. MadButterfly would draw the content of a
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121 * redraw_man object on the surface, inherited from the SurfaceView
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122 * class, associated with the MBView object.
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123 *
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124 */