Added SDL_RenderClear() as a fast method of clearing the screen to th…

…e drawing color.

Renamed SDL_RenderPoint() and SDL_RenderLine() to SDL_RenderDrawPoint() and SDL_RenderDrawLine().
Added API for rectangle drawing (as opposed to filling)
Added placeholder API functions for circles and ellipses ... I'm not sure whether these will stay.
Optimized software line drawing quite a bit.
Added support for Wu's anti-aliased line drawing, currently disabled by default.

include/SDL_compat.h

@@ -295,7 +295,9 @@ extern DECLSPEC int SDLCALL SDL_EnableKeyRepeat(int delay, int interval);
 extern DECLSPEC void SDLCALL SDL_GetKeyRepeat(int *delay, int *interval);
 extern DECLSPEC int SDLCALL SDL_EnableUNICODE(int enable);
 
-#define SDL_RenderFill  SDL_RenderRect
+#define SDL_RenderPoint SDL_RenderDrawPoint
+#define SDL_RenderLine SDL_RenderDrawLine
+#define SDL_RenderFill(X)  (X) ? SDL_RenderFillRect(X) : SDL_RenderClear()
 
 extern DECLSPEC int SDLCALL SDL_putenv(const char *variable);
 

include/SDL_surface.h

@@ -411,12 +411,9 @@ extern DECLSPEC int SDLCALL SDL_DrawPoints
 /**
  *  Blends a point with an RGBA value.
  *  
- *  The color should be a pixel of the format used by the surface, and 
- *  can be generated by the SDL_MapRGB() function.
- *  
  *  \return 0 on success, or -1 on error.
  */
-extern DECLSPEC int SDLCALL SDL_BlendDrawPoint
+extern DECLSPEC int SDLCALL SDL_BlendPoint
     (SDL_Surface * dst, int x, int y,
      int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
 extern DECLSPEC int SDLCALL SDL_BlendPoints
@@ -464,9 +461,9 @@ extern DECLSPEC int SDLCALL SDL_DrawRects
     (SDL_Surface * dst, const SDL_Rect ** rects, int count, Uint32 color);
 
 /**
- *  Blends the given rectangle with \c color.
+ *  Blends an RGBA value into the outline of the given rectangle.
  *  
- *  If \c rect is NULL, the whole surface will have a blended outline of \c color.
+ *  If \c rect is NULL, the whole surface will have a blended outline.
  *  
  *  \return 0 on success, or -1 on error.
  */
@@ -495,7 +492,7 @@ extern DECLSPEC int SDLCALL SDL_FillRects
 /**
  *  Blends an RGBA value into the given rectangle.
  *  
- *  If \c rect is NULL, the whole surface will be blended with \c color.
+ *  If \c rect is NULL, the whole surface will be blended with the color.
  *  
  *  \return This function returns 0 on success, or -1 on error.
  */
@@ -506,6 +503,88 @@ extern DECLSPEC int SDLCALL SDL_BlendFillRects
     (SDL_Surface * dst, const SDL_Rect ** rects, int count,
      int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
 
+#if 0
+/**
+ *  Draws the given circle with \c color.
+ *  
+ *  The color should be a pixel of the format used by the surface, and 
+ *  can be generated by the SDL_MapRGB() function.
+ *  
+ *  \return 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_DrawCircle
+    (SDL_Surface * dst, int x, int y, int radius, Uint32 color);
+
+/**
+ *  Blends an RGBA value into the outline of the given circle.
+ *  
+ *  \return 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_BlendCircle
+    (SDL_Surface * dst, int x, int y, int radius,
+     int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+
+/**
+ *  Fills the given circle with \c color.
+ *  
+ *  The color should be a pixel of the format used by the surface, and 
+ *  can be generated by the SDL_MapRGB() function.
+ *  
+ *  \return 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_FillCircle
+    (SDL_Surface * dst, int x, int y, int radius, Uint32 color);
+
+/**
+ *  Blends an RGBA value into the given circle.
+ *  
+ *  \return This function returns 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_BlendFillCircle
+    (SDL_Surface * dst, int x, int y, int radius,
+     int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+
+/**
+ *  Draws the given ellipse with \c color.
+ *  
+ *  The color should be a pixel of the format used by the surface, and 
+ *  can be generated by the SDL_MapRGB() function.
+ *  
+ *  \return 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_DrawEllipse
+    (SDL_Surface * dst, int x, int y, int w, int h, Uint32 color);
+
+/**
+ *  Blends an RGBA value into the outline of the given ellipse.
+ *  
+ *  \return 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_BlendEllipse
+    (SDL_Surface * dst, int x, int y, int w, int h,
+     int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+
+/**
+ *  Fills the given ellipse with \c color.
+ *  
+ *  The color should be a pixel of the format used by the surface, and 
+ *  can be generated by the SDL_MapRGB() function.
+ *  
+ *  \return 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_FillEllipse
+    (SDL_Surface * dst, int x, int y, int w, int h, Uint32 color);
+
+/**
+ *  Blends an RGBA value into the given ellipse.
+ *  
+ *  \return This function returns 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_BlendFillEllipse
+    (SDL_Surface * dst, int x, int y, int w, int h,
+     int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+#endif // 0
+
 /**
  *  Performs a fast blit from the source surface to the destination surface.
  *  

include/SDL_video.h

@@ -1137,6 +1137,11 @@ extern DECLSPEC int SDLCALL SDL_SetRenderDrawBlendMode(int blendMode);
  */
 extern DECLSPEC int SDLCALL SDL_GetRenderDrawBlendMode(int *blendMode);
 
+/**
+ *  \brief Clear the current rendering target with the drawing color
+ */
+extern DECLSPEC int SDLCALL SDL_RenderClear();
+
 /**
  *  \brief Draw a point on the current rendering target.
  *  
@@ -1145,7 +1150,7 @@ extern DECLSPEC int SDLCALL SDL_GetRenderDrawBlendMode(int *blendMode);
  *  
  *  \return 0 on success, or -1 if there is no rendering context current.
  */
-extern DECLSPEC int SDLCALL SDL_RenderPoint(int x, int y);
+extern DECLSPEC int SDLCALL SDL_RenderDrawPoint(int x, int y);
 
 /**
  *  \brief Draw some number of points on the current rendering target.
@@ -1155,8 +1160,8 @@ extern DECLSPEC int SDLCALL SDL_RenderPoint(int x, int y);
  *  
  *  \return 0 on success, or -1 if there is no rendering context current.
  */
-extern DECLSPEC int SDLCALL SDL_RenderPoints(const SDL_Point * points,
-                                             int count);
+extern DECLSPEC int SDLCALL SDL_RenderDrawPoints(const SDL_Point * points,
+                                                 int count);
 
 /**
  *  \brief Draw a line on the current rendering target.
@@ -1168,7 +1173,7 @@ extern DECLSPEC int SDLCALL SDL_RenderPoints(const SDL_Point * points,
  *  
  *  \return 0 on success, or -1 if there is no rendering context current.
  */
-extern DECLSPEC int SDLCALL SDL_RenderLine(int x1, int y1, int x2, int y2);
+extern DECLSPEC int SDLCALL SDL_RenderDrawLine(int x1, int y1, int x2, int y2);
 
 /**
  *  \brief Draw a series of connected lines on the current rendering target.
@@ -1178,18 +1183,37 @@ extern DECLSPEC int SDLCALL SDL_RenderLine(int x1, int y1, int x2, int y2);
  *  
  *  \return 0 on success, or -1 if there is no rendering context current.
  */
-extern DECLSPEC int SDLCALL SDL_RenderLines(const SDL_Point * points,
-                                            int count);
+extern DECLSPEC int SDLCALL SDL_RenderDrawLines(const SDL_Point * points,
+                                                int count);
+
+/**
+ *  \brief Draw a rectangle on the current rendering target with the drawing color.
+ *  
+ *  \param rect A pointer to the destination rectangle, or NULL to outline the entire rendering target.
+ *  
+ *  \return 0 on success, or -1 if there is no rendering context current.
+ */
+extern DECLSPEC int SDLCALL SDL_RenderDrawRect(const SDL_Rect * rect);
 
 /**
- *  \brief Fill the current rendering target with the drawing color.
+ *  \brief Draw some number of rectangles in the current rendering target with the drawing color.
+ *  
+ *  \param rects A pointer to an array of destination rectangles.
+ *  \param count The number of rectangles.
+ *  
+ *  \return 0 on success, or -1 if there is no rendering context current.
+ */
+extern DECLSPEC int SDLCALL SDL_RenderDrawRects(const SDL_Rect ** rect, int count);
+
+/**
+ *  \brief Fill a rectangle on the current rendering target with the drawing color.
  *  
  *  \param rect A pointer to the destination rectangle, or NULL for the entire 
  *              rendering target.
  *  
  *  \return 0 on success, or -1 if there is no rendering context current.
  */
-extern DECLSPEC int SDLCALL SDL_RenderRect(const SDL_Rect * rect);
+extern DECLSPEC int SDLCALL SDL_RenderFillRect(const SDL_Rect * rect);
 
 /**
  *  \brief Fill some number of rectangles in the current rendering target with the drawing color.
@@ -1199,7 +1223,37 @@ extern DECLSPEC int SDLCALL SDL_RenderRect(const SDL_Rect * rect);
  *  
  *  \return 0 on success, or -1 if there is no rendering context current.
  */
-extern DECLSPEC int SDLCALL SDL_RenderRects(const SDL_Rect ** rect, int count);
+extern DECLSPEC int SDLCALL SDL_RenderFillRects(const SDL_Rect ** rect, int count);
+
+#if 0
+/**
+ *  \brief Draw a circle on the current rendering target with the drawing color.
+ *  
+ *  \return 0 on success, or -1 if there is no rendering context current.
+ */
+extern DECLSPEC int SDLCALL SDL_RenderDrawCircle(int x, int y, int radius);
+
+/**
+ *  \brief Fill a circle on the current rendering target with the drawing color.
+ *  
+ *  \return 0 on success, or -1 if there is no rendering context current.
+ */
+extern DECLSPEC int SDLCALL SDL_RenderFillCircle(int x, int y, int radius);
+
+/**
+ *  \brief Draw an ellipse on the current rendering target with the drawing color.
+ *  
+ *  \return 0 on success, or -1 if there is no rendering context current.
+ */
+extern DECLSPEC int SDLCALL SDL_RenderDrawEllipse(int x, int y, int w, int h);
+
+/**
+ *  \brief Fill an ellipse on the current rendering target with the drawing color.
+ *  
+ *  \return 0 on success, or -1 if there is no rendering context current.
+ */
+extern DECLSPEC int SDLCALL SDL_RenderFillEllipse(int x, int y, int w, int h);
+#endif // 0
 
 /**
  *  \brief Copy a portion of the texture to the current rendering target.