ANativeWindow是个什么东西
公司经常组织一些培训,培训的都是些奇技淫巧。什么设计模式啦,开发策略啦,git啦,repo啦,另外就是培训一些开发流程的东东,例如CMMI啦。可是,却忘记了,程序员终究要归结到三个问题上:
1.解决什么问题?
2.为什么这样解决问题?
3.有没有更好的解决方案?
这些东东才是最核心的东东。但是却是一个程序员一辈子都无法完全掌握的东西。很多人以为写出了高难度的反射代码就是很牛,也有人认为利用C++模板来进行编程就多牛多牛,还有人觉得会写makefile文件,掌握了某种高难度语言很牛。但是我认为这些都不重要,重要的是要有思想。思考者比行动者在关键时候定大局。中国人的技术书籍缺乏的就是思想。在中国,可以肯定,没有几个人能写出像thinking in java这样的鸿篇巨著,更没有人能够超越 design pattern,来描述其思想。反之,像《自己动手写操作系统》,《21天学java》,《程序员的自我修养》,《面试宝典》,《C++面试一百例》, android内核开发要点等等等等一系列的书籍在中国却是层出不穷。为什么,因为缺乏思考,来不及思考,更或者懒得思考。然而,作为一名专业级的程序员,不思考就意味着退步,不学习就意味着淘汰。
这几天一直在思考ANativeWindow是个什么东西,今天终于找到了,代码贴出来,大家参考一下。
- struct ANativeWindow
- {
- #ifdef __cplusplus
- ANativeWindow()
- : flags(0), minSwapInterval(0), maxSwapInterval(0), xdpi(0), ydpi(0)
- {
- common.magic = ANDROID_NATIVE_WINDOW_MAGIC;
- common.version = sizeof(ANativeWindow);
- memset(common.reserved, 0, sizeof(common.reserved));
- }
- /* Implement the methods that sp<ANativeWindow> expects so that it
- can be used to automatically refcount ANativeWindow's. */
- void incStrong(const void* id) const {
- common.incRef(const_cast<android_native_base_t*>(&common));
- }
- void decStrong(const void* id) const {
- common.decRef(const_cast<android_native_base_t*>(&common));
- }
- #endif
- struct android_native_base_t common;
- /* flags describing some attributes of this surface or its updater */
- const uint32_t flags;
- /* min swap interval supported by this updated */
- const int minSwapInterval;
- /* max swap interval supported by this updated */
- const int maxSwapInterval;
- /* horizontal and vertical resolution in DPI */
- const float xdpi;
- const float ydpi;
- /* Some storage reserved for the OEM's driver. */
- intptr_t oem[4];
- /*
- * Set the swap interval for this surface.
- *
- * Returns 0 on success or -errno on error.
- */
- int (*setSwapInterval)(struct ANativeWindow* window,
- int interval);
- /*
- * Hook called by EGL to acquire a buffer. After this call, the buffer
- * is not locked, so its content cannot be modified. This call may block if
- * no buffers are available.
- *
- * The window holds a reference to the buffer between dequeueBuffer and
- * either queueBuffer or cancelBuffer, so clients only need their own
- * reference if they might use the buffer after queueing or canceling it.
- * Holding a reference to a buffer after queueing or canceling it is only
- * allowed if a specific buffer count has been set.
- *
- * Returns 0 on success or -errno on error.
- */
- int (*dequeueBuffer)(struct ANativeWindow* window,
- struct ANativeWindowBuffer** buffer);
- /*
- * hook called by EGL to lock a buffer. This MUST be called before modifying
- * the content of a buffer. The buffer must have been acquired with
- * dequeueBuffer first.
- *
- * Returns 0 on success or -errno on error.
- */
- int (*lockBuffer)(struct ANativeWindow* window,
- struct ANativeWindowBuffer* buffer);
- /*
- * Hook called by EGL when modifications to the render buffer are done.
- * This unlocks and post the buffer.
- *
- * The window holds a reference to the buffer between dequeueBuffer and
- * either queueBuffer or cancelBuffer, so clients only need their own
- * reference if they might use the buffer after queueing or canceling it.
- * Holding a reference to a buffer after queueing or canceling it is only
- * allowed if a specific buffer count has been set.
- *
- * Buffers MUST be queued in the same order than they were dequeued.
- *
- * Returns 0 on success or -errno on error.
- */
- int (*queueBuffer)(struct ANativeWindow* window,
- struct ANativeWindowBuffer* buffer);
- /*
- * hook used to retrieve information about the native window.
- *
- * Returns 0 on success or -errno on error.
- */
- int (*query)(const struct ANativeWindow* window,
- int what, int* value);
- /*
- * hook used to perform various operations on the surface.
- * (*perform)() is a generic mechanism to add functionality to
- * ANativeWindow while keeping backward binary compatibility.
- *
- * DO NOT CALL THIS HOOK DIRECTLY. Instead, use the helper functions
- * defined below.
- *
- * (*perform)() returns -ENOENT if the 'what' parameter is not supported
- * by the surface's implementation.
- *
- * The valid operations are:
- * NATIVE_WINDOW_SET_USAGE
- * NATIVE_WINDOW_CONNECT (deprecated)
- * NATIVE_WINDOW_DISCONNECT (deprecated)
- * NATIVE_WINDOW_SET_CROP
- * NATIVE_WINDOW_SET_BUFFER_COUNT
- * NATIVE_WINDOW_SET_BUFFERS_GEOMETRY (deprecated)
- * NATIVE_WINDOW_SET_BUFFERS_TRANSFORM
- * NATIVE_WINDOW_SET_BUFFERS_TIMESTAMP
- * NATIVE_WINDOW_SET_BUFFERS_DIMENSIONS
- * NATIVE_WINDOW_SET_BUFFERS_FORMAT
- * NATIVE_WINDOW_SET_SCALING_MODE
- * NATIVE_WINDOW_LOCK (private)
- * NATIVE_WINDOW_UNLOCK_AND_POST (private)
- * NATIVE_WINDOW_API_CONNECT (private)
- * NATIVE_WINDOW_API_DISCONNECT (private)
- *
- */
- int (*perform)(struct ANativeWindow* window,
- int operation, ... );
- /*
- * Hook used to cancel a buffer that has been dequeued.
- * No synchronization is performed between dequeue() and cancel(), so
- * either external synchronization is needed, or these functions must be
- * called from the same thread.
- *
- * The window holds a reference to the buffer between dequeueBuffer and
- * either queueBuffer or cancelBuffer, so clients only need their own
- * reference if they might use the buffer after queueing or canceling it.
- * Holding a reference to a buffer after queueing or canceling it is only
- * allowed if a specific buffer count has been set.
- */
- int (*cancelBuffer)(struct ANativeWindow* window,
- struct ANativeWindowBuffer* buffer);
- void* reserved_proc[2];
- };
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