| Index: ppapi/api/ppb_var_array_buffer.idl
|
| ===================================================================
|
| --- ppapi/api/ppb_var_array_buffer.idl (revision 122520)
|
| +++ ppapi/api/ppb_var_array_buffer.idl (working copy)
|
| @@ -4,7 +4,8 @@
|
| */
|
|
|
| /**
|
| - * This file defines the <code>PPB_VarArrayBuffer</code> struct.
|
| + * This file defines the <code>PPB_VarArrayBuffer</code> struct providing
|
| + * a way to interact with JavaScript ArrayBuffers.
|
| */
|
|
|
| label Chrome {
|
| @@ -12,72 +13,85 @@
|
| };
|
|
|
| /**
|
| - * PPB_VarArrayBuffer API. This provides a way to interact with JavaScript
|
| - * ArrayBuffers, which represent a contiguous sequence of bytes. To manage the
|
| - * reference count for a VarArrayBuffer, please see PPB_Var. Note that
|
| - * these Vars are not part of the embedding page's DOM, and can only be shared
|
| - * with JavaScript via pp::Instance's PostMessage and HandleMessage functions.
|
| + * The <code>PPB_VarArrayBuffer</code> interface provides a way to interact
|
| + * with JavaScript ArrayBuffers, which represent a contiguous sequence of
|
| + * bytes. Use <code>PPB_Var</code> to manage the reference count for a
|
| + * <code>VarArrayBuffer</code>. Note that these Vars are not part of the
|
| + * embedding page's DOM, and can only be shared with JavaScript using the
|
| + * <code>PostMessage</code> and <code>HandleMessage</code> functions of
|
| + * <code>pp::Instance</code>.
|
| */
|
| [macro="PPB_VAR_ARRAY_BUFFER_INTERFACE"]
|
| interface PPB_VarArrayBuffer {
|
| /**
|
| - * Create a zero-initialized VarArrayBuffer.
|
| + * Create() creates a zero-initialized <code>VarArrayBuffer</code>.
|
| *
|
| - * @param[in] size_in_bytes The size of the ArrayBuffer that will be created.
|
| + * @param[in] size_in_bytes The size of the <code>ArrayBuffer</code> to
|
| + * be created.
|
| *
|
| - * @return A PP_Var which represents a VarArrayBuffer of the requested size
|
| - * with a reference count of 1.
|
| + * @return A <code>PP_Var</code> representing a <code>VarArrayBuffer</code>
|
| + * of the requested size and with a reference count of 1.
|
| */
|
| PP_Var Create([in] uint32_t size_in_bytes);
|
|
|
| /**
|
| - * Retrieves the length of the VarArrayBuffer in bytes. On success,
|
| - * byte_length is set to the length of the given ArrayBuffer var. On failure,
|
| - * byte_length is unchanged (this could happen, for instance, if the given
|
| - * PP_Var is not of type PP_VARTYPE_ARRAY_BUFFER). Note that ByteLength() will
|
| - * successfully retrieve the the size of an ArrayBuffer even if the
|
| - * ArrayBuffer is not currently mapped.
|
| + * ByteLength() retrieves the length of the <code>VarArrayBuffer</code> in
|
| + * bytes. On success, <code>byte_length</code> is set to the length of the
|
| + * given <code>ArrayBuffer</code> var. On failure, <code>byte_length</code>
|
| + * is unchanged (this could happen, for instance, if the given
|
| + * <code>PP_Var</code> is not of type <code>PP_VARTYPE_ARRAY_BUFFER</code>).
|
| + * Note that ByteLength() will successfully retrieve the size of an
|
| + * <code>ArrayBuffer</code> even if the <code>ArrayBuffer</code> is not
|
| + * currently mapped.
|
| *
|
| - * @param[in] array The ArrayBuffer whose length should be returned.
|
| + * @param[in] array The <code>ArrayBuffer</code> whose length should be
|
| + * returned.
|
| *
|
| * @param[out] byte_length A variable which is set to the length of the given
|
| - * ArrayBuffer on success.
|
| + * <code>ArrayBuffer</code> on success.
|
| *
|
| - * @return PP_TRUE on success, PP_FALSE on failure.
|
| + * @return <code>PP_TRUE</code> on success, <code>PP_FALSE</code> on failure.
|
| */
|
| PP_Bool ByteLength([in] PP_Var array, [out] uint32_t byte_length);
|
|
|
| /**
|
| - * Maps the ArrayBuffer in to the module's address space and returns a pointer
|
| - * to the beginning of the buffer for the given ArrayBuffer PP_Var. Note that
|
| - * calling Map() can be a relatively expensive operation. Use care when
|
| - * calling it in performance-critical code. For example, you should call it
|
| - * only once when looping over an ArrayBuffer:
|
| + * Map() maps the <code>ArrayBuffer</code> in to the module's address space
|
| + * and returns a pointer to the beginning of the buffer for the given
|
| + * <code>ArrayBuffer PP_Var</code>. Note that calling Map() can be a
|
| + * relatively expensive operation. Use care when calling it in
|
| + * performance-critical code. For example, you should call it only once when
|
| + * looping over an <code>ArrayBuffer</code>.
|
| *
|
| - * <code>
|
| - * char* data = (char*)(array_buffer_if.Map(array_buffer_var));
|
| - * uint32_t byte_length = 0;
|
| - * PP_Bool ok = array_buffer_if.ByteLength(array_buffer_var, &byte_length);
|
| - * if (!ok)
|
| - * return DoSomethingBecauseMyVarIsNotAnArrayBuffer();
|
| - * for (uint32_t i = 0; i < byte_length; ++i)
|
| - * data[i] = 'A';
|
| - * </code>
|
| + * <strong>Example:</strong>
|
| *
|
| - * @param[in] array The ArrayBuffer whose internal buffer should be returned.
|
| + * @code
|
| + * char* data = (char*)(array_buffer_if.Map(array_buffer_var));
|
| + * uint32_t byte_length = 0;
|
| + * PP_Bool ok = array_buffer_if.ByteLength(array_buffer_var, &byte_length);
|
| + * if (!ok)
|
| + * return DoSomethingBecauseMyVarIsNotAnArrayBuffer();
|
| + * for (uint32_t i = 0; i < byte_length; ++i)
|
| + * data[i] = 'A';
|
| + * @endcode
|
| *
|
| - * @return A pointer to the internal buffer for this ArrayBuffer. Returns NULL
|
| - * if the given PP_Var is not of type PP_VARTYPE_ARRAY_BUFFER.
|
| + * @param[in] array The <code>ArrayBuffer</code> whose internal buffer should
|
| + * be returned.
|
| + *
|
| + * @return A pointer to the internal buffer for this
|
| + * <code>ArrayBuffer</code>. Returns <code>NULL</code>
|
| + * if the given <code>PP_Var</code> is not of type
|
| + * <code>PP_VARTYPE_ARRAY_BUFFER</code>.
|
| */
|
| mem_t Map([in] PP_Var array);
|
|
|
| /**
|
| - * Unmaps the given ArrayBuffer var from the module address space. Use this if
|
| - * you want to save memory but might want to Map the buffer again later. The
|
| - * PP_Var remains valid and should still be released using PPB_Var when you
|
| - * are done with the ArrayBuffer.
|
| + * Unmap() unmaps the given <code>ArrayBuffer</code> var from the module
|
| + * address space. Use this if you want to save memory but might want to call
|
| + * Map() to map the buffer again later. The <code>PP_Var</code> remains valid
|
| + * and should still be released using <code>PPB_Var</code> when you are done
|
| + * with the <code>ArrayBuffer</code>.
|
| *
|
| - * @param[in] array The ArrayBuffer which should be released.
|
| + * @param[in] array The <code>ArrayBuffer</code> to be released.
|
| */
|
| void Unmap([in] PP_Var array);
|
| };
|
|
|