Move win-agnostic parts of draw/drawregion to st.c

Introduces three functions to encapsulate X-specific behavior:
 * xdrawline: draws a portion of a single line (used by drawregion)
 * xbegindraw: called to prepare for drawing (will be useful for e.g.
   Wayland) and returns true if drawing should happen
 * xfinishdraw: called to finish drawing (used by draw)

Signed-off-by: Devin J. Pohly <djpohly@gmail.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/win.h b/win.h
index 1e08b16..6e662af 100644
--- a/win.h
+++ b/win.h
@@ -23,12 +23,12 @@ enum win_mode {
                           |MODE_MOUSEMANY,
 };
 
-void draw(void);
-void drawregion(int, int, int, int);
-
 void xbell(void);
 void xclipcopy(void);
+void xdrawcursor(void);
+void xdrawline(Line, int, int, int);
 void xhints(void);
+void xfinishdraw(void);
 void xloadcols(void);
 int xsetcolorname(int, const char *);
 void xsettitle(char *);
@@ -36,3 +36,4 @@ int xsetcursor(int);
 void xsetmode(int, unsigned int);
 void xsetpointermotion(int);
 void xsetsel(char *);
+int xstartdraw(void);