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implement pushStyle() and popStyle()

	save/restore all style related attributes (fill, stroke, ...)

--- a/api.c

+++ b/api.c

@@ -1,6 +1,7 @@

 #include "a.h"

 typedef struct Tmatrix Tmatrix;

+typedef struct Style Style;

 struct Tmatrix

 {

@@ -8,6 +9,16 @@

 	double angle;

 };

+struct Style

+{

+	int		nostroke;

+	int		strokecap;

+	Image	*stroke;

+	int		strokewidth;

+	int		nofill;

+	Image	*fill;

+};

+

 enum

 {

 	Crgb,

@@ -32,6 +43,8 @@

 Tmatrix tstack[255] = {0};

 int ntstack;

+Style sstack[255] = {0};

+int nsstack;

 void

 initstate(lua_State *L)

@@ -464,6 +477,36 @@

 	return 0;

 }

+int

+cpushstyle(lua_State *L)

+{

+	if(nsstack == nelem(sstack) - 1)

+		return luaL_error(L, "stack overflow");

+	sstack[nsstack].nostroke = nostroke;

+	sstack[nsstack].strokecap = strokecap;

+	sstack[nsstack].stroke = stroke;

+	sstack[nsstack].strokewidth = strokewidth;

+	sstack[nsstack].nofill = nofill;

+	sstack[nsstack].fill = fill;

+	nsstack++;

+	return 0;

+}

+

+int

+cpopstyle(lua_State *L)

+{

+	if(nsstack == 0)

+		return luaL_error(L, "stack underflow");

+	nsstack--;

+	nostroke = sstack[nsstack].nostroke;

+	strokecap = sstack[nsstack].strokecap;

+	stroke = sstack[nsstack].stroke;

+	strokewidth = sstack[nsstack].strokewidth;

+	nofill = sstack[nsstack].nofill;

+	fill = sstack[nsstack].fill;

+	return 0;

+}

+

 void

 registerfunc(lua_State *L, const char *name, int(*f)(lua_State*))

 {

@@ -505,5 +548,7 @@

 	registerfunc(L, "radians", cradians);

 	registerfunc(L, "pushMatrix", cpushmatrix);

 	registerfunc(L, "popMatrix", cpopmatrix);

+	registerfunc(L, "pushStyle", cpushstyle);

+	registerfunc(L, "popStyle", cpopstyle);

 }