Returns true if the mask is empty: i.e. it has an empty bounds. */

note: this can not be implemented with return approximately_equal(a.fY, fY) && approximately_equal(a.fX, fX); because that will not take the magnitude

returns true if (a <= b <= c) || (a >= b >= c)

Return the next verb in this iteration of the path. When all segments have been visited, return kDone_Verb. @param pts The p

Return the total size of the data pointer. Only defined if the length was specified in the constructor or in a call to reset(). */

Returns the specified SkScalar squared (x*x) */

The meaning of 'value' changes for the specific type of TiXmlNode. @verbatim Document: filename of the xml file Element: name of the element

Causes any deferred drawing to the device to be completed. */

< Call if getType() is not kEmpty to get the set operation used to combine this element.

* GetEventSet * @brief 获取SEventSet对象 * @return SEventSet * SEventSet对象指针 * * Describe */

* Shortcut for getUniformVariable(u).c_str() */

If this guy returns true, then chooseProc() must return a valid proc

** Make sure the database is open. If it is not, then open it. If ** the database fails to open, print an error message and exit. */

See #define SkAlphaMulAlpha(a, b) SkMulDiv255Round(a, b) in SkXfermode.cpp.

* Returns the RR's sub type. */

Write the data of a PNG chunk started with png_write_chunk_header(). * Note that multiple calls to this function are allowed, and that the * sum of

* Push an item onto the head of the list. * This method is *not* thread safe. */