Documentation: C API comments in include/

include/c/sk_picture.h

Index: include/c/sk_picture.h
diff --git a/include/c/sk_picture.h b/include/c/sk_picture.h
index f062d32e6938e0cf1121e6e0f440487e293302e8..338b7d906ac8d75dfd8467bcd699e61806a7c8fc 100644
--- a/include/c/sk_picture.h
+++ b/include/c/sk_picture.h
@@ -15,16 +15,54 @@
 
 SK_C_PLUS_PLUS_BEGIN_GUARD
 
+/**
+    Create a new sk_picture_recorder_t.  Its resources should be
+    released with a call to sk_picture_recorder_delete().
+*/
 sk_picture_recorder_t* sk_picture_recorder_new();
+/**
+    Release the memory and other resources used by this
+    sk_picture_recorder_t.
+*/
 void sk_picture_recorder_delete(sk_picture_recorder_t*);
 
+/**
+   Returns the canvas that records the drawing commands
+
+   @param sk_rect_t* the cull rect used when recording this
+                     picture. Any drawing the falls outside of this
+                     rect is undefined, and may be drawn or it may not.
+*/
 sk_canvas_t* sk_picture_recorder_begin_recording(sk_picture_recorder_t*, const sk_rect_t*);
+/**
+    Signal that the caller is done recording. This invalidates the
+    canvas returned by begin_recording. Ownership of the sk_picture_t
+    is passed to the caller, who must call sk_picture_unref() when
+    they are done using it.  The returned picture is immutable.
+*/
 sk_picture_t* sk_picture_recorder_end_recording(sk_picture_recorder_t*);
 
+/**
+    Increment the reference count on the given sk_picture_t. Must be
+    balanced by a call to sk_picture_unref().
+*/
 void sk_picture_ref(sk_picture_t*);
+/**
+    Decrement the reference count. If the reference count is 1 before
+    the decrement, then release both the memory holding the
+    sk_picture_t and any resouces it may be managing.  New
+    sk_picture_t are created with a reference count of 1.
+*/
 void sk_picture_unref(sk_picture_t*);
 
+/**
+    Returns a non-zero value unique among all pictures.
+ */
 uint32_t sk_picture_get_unique_id(sk_picture_t*);
+
+/**
+    Return the cull rect specified when this picture was recorded.
+*/
 sk_rect_t sk_picture_get_bounds(sk_picture_t*);
 
 SK_C_PLUS_PLUS_END_GUARD