Moved fixed point multiplication and rounding into an asm module.

git-svn-id: svn://svn.cc65.org/cc65/trunk@4447 b7a2c559-68d2-44c3-8de9-860c34a00d81

include/tgi.h

@@ -218,6 +218,14 @@ void __fastcall__ tgi_ellipse (int x, int y, unsigned char rx, unsigned char ry)
  * drawing color.
  */
 
+void __fastcall__ tgi_arc (int x, int y, unsigned char rx, unsigned char ry,
+                           unsigned sa, unsigned ea);
+/* Draw an ellipse arc with center at x/y and radii rx/ry using the current
+ * drawing color. The arc covers the angle between sa and ea (startangle and
+ * endangle), which must be in the range 0..360 (otherwise the function may
+ * bevave unextectedly).
+ */
+
 void __fastcall__ tgi_bar (int x1, int y1, int x2, int y2);
 /* Draw a bar (a filled rectangle) using the current color. */
 

include/tgi/tgi-kernel.h

@@ -44,7 +44,7 @@
 
 
 
-/* TGI kernel variables */              
+/* TGI kernel variables */
 extern void*   	        tgi_drv;       	/* Pointer to driver */
 extern unsigned char  	tgi_error;     	/* Last error code */
 extern unsigned char    tgi_gmode;      /* Flag: Graphics mode active */
@@ -68,6 +68,11 @@ extern unsigned         tgi_aspectratio;/* Aspect ratio as fixed point 8.8 */
 const char* __fastcall__ tgi_map_mode (unsigned char mode);
 /* Map a tgi mode to a driver name. Returns NULL if no driver available. */
 
+int __fastcall__ tgi_imulround (int rhs, int lhs);
+/* Helper function for functions using sine/cosine: Multiply two values, one
+ * being an 8.8 fixed point one, and return the rounded and scaled result.
+ */
+
 
 
 /* End of tgi-kernel.h */