ANativeWindow是个什么东西
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发布时间：2022-05-16 03:58
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时间：2023-08-03 11:14
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, ... );
