Added warning on readme about additional function

also, kept NPatchInfo ctypes structure from being defined.

Author: overdev

README.md

@@ -216,6 +216,28 @@ vec['y'] = 20
 # vec[2:] = zw      # <--- not supported; will raise TypeError
 ```
 
+## Additional (feature) draw function: `draw_texture_npatch`
+
+The custom DLL installed by _raylib-py_ includes an not yet official drawing function and
+corresponding `NPatchInfo` helper structure:
+
+```python
+# draws an 3-patch (vertical, or horizontal) or 9-patch textured that stretches and
+# shrinks nicely.
+# Seq means any sequence type
+def draw_texture_npatch(texture: Texture2D, npatch_info: NPatchInfo,
+                        dest_rec: Union[Rectangle, Seq], origin: Union[Vector2, Seq],
+                        rotation: float, tint: Union[Color, Seq]) -> None:
+```
+
+At the moment (after _raylib_ v2.0.0), only the x86 custom DLL contains this function
+and, to enabled it, an specific `os.environ` key must be set:
+
+```python
+# set this before importing raylibpy (the value does not matter as long is a str type)
+os.environ['ENABLE_V2_0_0_FEATURE_DRAWTEXTURENPATCH'] = '1'
+```
+
 ## Building _raylib_ from source
 
 _raylib_ wiki pages contains information on how to build it on [Windows](https://github.com/raysan5/raylib/wiki/Working-on-Windows), [Mac](https://github.com/raysan5/raylib/wiki/Working-on-macOS), [Linux](https://github.com/raysan5/raylib/wiki/Working-on-GNU-Linux) and other platforms.

raylibpy/__init__.py

@@ -2081,47 +2081,50 @@ def __str__(self) -> str:
         return "(RENDERTEXTURE: {}w, {}h, texture: {}, depth: {})".format(self.width, self.height, self.texture, self.depth)
 
 
-class _NPatchInfo(Structure):
-    _fields_ = [
-        ('sourceRec', Rectangle),
-        ('left', c_int),
-        ('top', c_int),
-        ('right', c_int),
-        ('bottom', c_int),
-        ('type', c_int),
-    ]
-
-
-class NPatchInfo(_NPatchInfo):
-
-    def __init__(self, source_rec: 'Rectangle', left: int=1, top:int=1, right: int=1, bottom: int=1, npatch_type: Union[int, 'NPatchType']=0) -> None:
-        if npatch_type not in NPatchType:
-            npatch_type = {
+if ENABLE_V2_0_0_FEATURE_DRAWTEXTURENPATCH:
+    class _NPatchInfo(Structure):
+        _fields_ = [
+            ('sourceRec', Rectangle),
+            ('left', c_int),
+            ('top', c_int),
+            ('right', c_int),
+            ('bottom', c_int),
+            ('type', c_int),
+        ]
+
+    class NPatchInfo(_NPatchInfo):
+
+        def __init__(self, source_rec: 'Rectangle', left: int=1, top:int=1, right: int=1, bottom: int=1, npatch_type: Union[int, 'NPatchType']=0) -> None:
+            if npatch_type not in NPatchType:
+                npatch_type = {
+                    0: NPT_9PATCH,
+                    1: NPT_3PATCH_VERTICAL,
+                    2: NPT_3PATCH_VERTICAL
+                }.get(npatch_type, NPT_9PATCH)
+
+            super(NPatchInfo, self).__init__(source_rec, left, top, right, bottom, npatch_type)
+
+        def __str__(self) -> str:
+            """Textual representation."""
+            npt = {
                 0: NPT_9PATCH,
                 1: NPT_3PATCH_VERTICAL,
                 2: NPT_3PATCH_VERTICAL
-            }.get(npatch_type, NPT_9PATCH)
-
-        super(NPatchInfo, self).__init__(source_rec, left, top, right, bottom, npatch_type)
-
-    def __str__(self) -> str:
-        """Textual representation."""
-        npt = {
-            0: NPT_9PATCH,
-            1: NPT_3PATCH_VERTICAL,
-            2: NPT_3PATCH_VERTICAL
-        }.get(self.type, NPT_9PATCH).name
-        return "(NPATCHINFO: rec: {0.sourceRec}, ltrb: [{0.left}, {0.top}, {0.right}, {0.bottom}], type: {1})".format(self, npt)
-
-    def __repr__(self) -> str:
-        rc = repr(self.sourceRec)
-        npt = {
-            0: NPT_9PATCH,
-            1: NPT_3PATCH_VERTICAL,
-            2: NPT_3PATCH_VERTICAL
-        }.get(self.type, NPT_9PATCH).name
-        return "{0.__class__.__qualname__}({1}, {0.left}, {0.top}, {0.right}, {0.bottom}, {2})".format(self, rc, npt)
+            }.get(self.type, NPT_9PATCH).name
+            return "(NPATCHINFO: rec: {0.sourceRec}, ltrb: [{0.left}, {0.top}, {0.right}, {0.bottom}], type: {1})".format(self, npt)
 
+        def __repr__(self) -> str:
+            rc = repr(self.sourceRec)
+            npt = {
+                0: NPT_9PATCH,
+                1: NPT_3PATCH_VERTICAL,
+                2: NPT_3PATCH_VERTICAL
+            }.get(self.type, NPT_9PATCH).name
+            return "{0.__class__.__qualname__}({1}, {0.left}, {0.top}, {0.right}, {0.bottom}, {2})".format(self, rc, npt)
+else:
+    class NPatchInfo:
+        __slots__ = 'source_rec', 'left', 'top', 'right', 'bottom', 'type'
+        pass
 
 class CharInfo(Structure):
     _fields_ = [
@@ -4089,10 +4092,11 @@ def draw_texture_pro(texture: Texture2D, source_rec: Union[Rectangle, Seq], dest
     _rl.DrawTextureNPatch.argtypes = [Texture2D, NPatchInfo, Rectangle, Vector2, Float, Color]
     _rl.DrawTextureNPatch.restype = None
     def draw_texture_npatch(texture: Texture2D, npatch_info: NPatchInfo, dest_rec: Union[Rectangle, Seq], origin: Union[Vector2, Seq], rotation: float, tint: Union[Color, Seq]) -> None:
-        """Draw a part of a texture defined by a rectangle with 'pro' parameters"""
+        """Draws a textures that stretches and shrinks nicely."""
         return _rl.DrawNPatch(texture, npatch_info, _rect(dest_rec), _vec2(origin), _float(rotation), _color(tint))
 else:
     def draw_texture_npatch(*args, **kwargs) -> None:
+        """WARNING: THIS FUNCTION HAS NO EFFECT!"""
         pass
 
 # -----------------------------------------------------------------------------------