api: path data size reduction (to 1 byte)

API Modification:
- enum class PathCommand -> enum class PathCommand : uint8_t
- enum class Result::Unknown (6) -> enum class Result::Unknown = 255

- typedef enum Tvg_Path_Command -> typedef uint8_t Tvg_Path_Command
- TVG_RESULT_UNKNOWN (6) -> TVG_RESULT_UNKNOWN = 255

inc/thorvg.h

@@ -85,7 +85,7 @@ enum class Result
     FailedAllocation,      ///< The value returned in case of unsuccessful memory allocation.
     MemoryCorruption,      ///< The value returned in the event of bad memory handling - e.g. failing in pointer releasing or casting
     NonSupport,            ///< The value returned in case of choosing unsupported engine features(options).
-    Unknown                ///< The value returned in all other cases.
+    Unknown = 255          ///< The value returned in all other cases.
 };
 
 
@@ -104,12 +104,9 @@ enum class ColorSpace : uint8_t
 
 
 /**
- * @brief Enumeration specifying the values of the path commands accepted by TVG.
+ * @brief Enumeration specifying the values of the path commands accepted by ThorVG.
- *
- * Not to be confused with the path commands from the svg path element (like M, L, Q, H and many others).
- * TVG interprets all of them and translates to the ones from the PathCommand values.
  */
-enum class PathCommand
+enum class PathCommand : uint8_t
 {
     Close = 0, ///< Ends the current sub-path and connects it with its initial point. This command doesn't expect any points.
     MoveTo,    ///< Sets a new initial point of the sub-path and a new current point. This command expects 1 point: the starting position.

src/bindings/capi/thorvg_capi.h

@@ -127,7 +127,7 @@ typedef enum {
     TVG_RESULT_FAILED_ALLOCATION,      ///< The value returned in case of unsuccessful memory allocation.
     TVG_RESULT_MEMORY_CORRUPTION,      ///< The value returned in the event of bad memory handling - e.g. failing in pointer releasing or casting
     TVG_RESULT_NOT_SUPPORTED,          ///< The value returned in case of choosing unsupported engine features(options).
-    TVG_RESULT_UNKNOWN                 ///< The value returned in all other cases.
+    TVG_RESULT_UNKNOWN = 255           ///< The value returned in all other cases.
 } Tvg_Result;
 
 
@@ -217,18 +217,16 @@ typedef enum {
  */
 
 /**
- * \brief Enumeration specifying the values of the path commands accepted by TVG.
+ * \brief Enumeration specifying the values of the path commands accepted by ThorVG.
- *
- * Not to be confused with the path commands from the svg path element (like M, L, Q, H and many others).
- * TVG interprets all of them and translates to the ones from the PathCommand values.
  */
-typedef enum {
+typedef uint8_t Tvg_Path_Command;
-    TVG_PATH_COMMAND_CLOSE = 0, ///< Ends the current sub-path and connects it with its initial point - corresponds to Z command in the svg path commands.
-    TVG_PATH_COMMAND_MOVE_TO,   ///< Sets a new initial point of the sub-path and a new current point - corresponds to M command in the svg path commands.
-    TVG_PATH_COMMAND_LINE_TO,   ///< Draws a line from the current point to the given point and sets a new value of the current point - corresponds to L command in the svg path commands.
-    TVG_PATH_COMMAND_CUBIC_TO   ///< Draws a cubic Bezier curve from the current point to the given point using two given control points and sets a new value of the current point - corresponds to C command in the svg path commands.
-} Tvg_Path_Command;
 
+enum {
+    TVG_PATH_COMMAND_CLOSE = 0,    ///< Ends the current sub-path and connects it with its initial point - corresponds to Z command in the svg path commands.
+    TVG_PATH_COMMAND_MOVE_TO,      ///< Sets a new initial point of the sub-path and a new current point - corresponds to M command in the svg path commands.
+    TVG_PATH_COMMAND_LINE_TO,      ///< Draws a line from the current point to the given point and sets a new value of the current point - corresponds to L command in the svg path commands.
+    TVG_PATH_COMMAND_CUBIC_TO      ///< Draws a cubic Bezier curve from the current point to the given point using two given control points and sets a new value of the current point - corresponds to C command in the svg path commands.
+};
 
 /**
  * \brief Enumeration determining the ending type of a stroke in the open sub-paths.