lavu/opencl: apply misc cosmetics fixes

Split long lines, reindent code, add missing spaces between operators,
remove possibly confusing comment from av_opencl_buffer_read_image()
doxy, and use designated initializers for openclutils_class.

libavutil/opencl.h

@@ -67,7 +67,8 @@ AVOpenCLExternalEnv *av_opencl_alloc_external_env(void);
 /**
  * Free OpenCL external environment.
  *
- * @param ext_opencl_env pointer to OpenCL external environment created by av_opencl_alloc_external_env()
+ * @param ext_opencl_env pointer to OpenCL external environment
+ *                       created by av_opencl_alloc_external_env()
  */
 void av_opencl_free_external_env(AVOpenCLExternalEnv **ext_opencl_env);
 
@@ -83,8 +84,8 @@ void av_opencl_free_external_env(AVOpenCLExternalEnv **ext_opencl_env);
 int av_opencl_register_kernel_code(const char *kernel_code);
 
 /**
- * Initialize the run time OpenCL environment and compile the kernel code registered with
- * av_opencl_register_kernel_code().
+ * Initialize the run time OpenCL environment and compile the kernel
+ * code registered with av_opencl_register_kernel_code().
  *
  * Currently, the only accepted option is "build_options", used to set
  * options to compile registered kernels code. See reference "OpenCL
@@ -100,8 +101,8 @@ int av_opencl_register_kernel_code(const char *kernel_code);
 /**
  * Create kernel object in the specified kernel environment.
  *
- * @param env                 pointer to kernel environment which is filled with the environment,
- *                                   used to run the kernel
+ * @param env              pointer to kernel environment which is filled with
+ *                         the environment used to run the kernel
  * @param kernel_name      kernel function name
  * @return >=0 on success, a negative error code in case of failure
  */
@@ -160,11 +161,10 @@ int av_opencl_buffer_read(uint8_t *dst_buf, cl_mem src_cl_buf, size_t buf_size);
  */
 int av_opencl_buffer_write_image(cl_mem dst_cl_buf, size_t cl_buffer_size, int dst_cl_offset,
                                  uint8_t **src_data, int *plane_size, int plane_num);
+
 /**
  * Read image data from OpenCL buffer.
  *
- * src buffer is OpenCL buffer, dst buffer is frame buffer(data[0],data[1]....).
- *
  * @param dst_data           array of pointers to destination plane buffers
  * @param dst_plane_sizes    array of pointers to destination plane buffers
  * @param dst_plane_num      number of destination image planes
@@ -172,20 +172,22 @@ int av_opencl_buffer_write_image(cl_mem dst_cl_buf, size_t cl_buffer_size, int d
  * @param src_cl_buf_size    size in bytes of OpenCL buffer
  * @return >=0 on success, a negative error code in case of failure
  */
-
 int av_opencl_buffer_read_image(uint8_t **dst_data, int *plane_size, int plane_num,
                                 cl_mem src_cl_buf, size_t cl_buffer_size);
+
 /**
  * Release OpenCL buffer.
  *
- * @param cl_buf  pointer to OpenCL buffer to release, which was previously filled with av_opencl_buffer_create()
+ * @param cl_buf pointer to OpenCL buffer to release, which was
+ *               previously filled with av_opencl_buffer_create()
  */
 void av_opencl_buffer_release(cl_mem *cl_buf);
 
 /**
  * Release kernel object.
  *
- * @param env  kernel environment where the kernel object was created with av_opencl_create_kernel
+ * @param env kernel environment where the kernel object was created
+ *            with av_opencl_create_kernel()
  */
 void av_opencl_release_kernel(AVOpenCLKernelEnv *env);