diff --git a/gtkarea/ui.h b/gtkarea/ui.h
index 387a7f1f..4cc6097d 100644
--- a/gtkarea/ui.h
+++ b/gtkarea/ui.h
@@ -55,8 +55,6 @@ enum uiDrawLineJoin {
 // so we're good to use it too!
 #define uiDrawDefaultMiterLimit 10.0
 
-// TODOs
-// - os x: FillPath/EOFillPath functions
 enum uiDrawFillMode {
 	uiDrawFillModeWinding,
 	// TODO rename to EvenOdd?
@@ -71,6 +69,7 @@ struct uiDrawStrokeParams {
 };
 
 void uiDrawBeginPathRGB(uiDrawContext *, uint8_t, uint8_t, uint8_t);
+// TODO verify these aren't alpha premultiplied anywhere
 void uiDrawBeginPathRGBA(uiDrawContext *, uint8_t, uint8_t, uint8_t, uint8_t);
 
 void uiDrawMoveTo(uiDrawContext *, intmax_t, intmax_t);
diff --git a/macarea/draw.c b/macarea/draw.c
new file mode 100644
index 00000000..87a620cc
--- /dev/null
+++ b/macarea/draw.c
@@ -0,0 +1,133 @@
+// 6 september 2015
+#include "area.h"
+
+struct uiDrawContext {
+	CGContextRef c;
+
+	BOOL useRGBA;
+	CGFloat r;
+	CGFloat g;
+	CGFloat b;
+	CGFloat a;
+};
+
+uiDrawContext *newContext(CGContextRef ctxt)
+{
+	uiDrawContext *c;
+
+	// TODO use uiNew
+	c = (uiDrawContext *) malloc(sizeof (uiDrawContext));
+	c->c = ctxt;
+	return c;
+}
+
+void uiDrawBeginPathRGB(uiDrawContext *c, uint8_t r, uint8_t g, uint8_t b)
+{
+	c->useRGB = YES;
+	c->r = ((CGFloat) r) / 255;
+	c->g = ((CGFloat) g) / 255;
+	c->b = ((CGFloat) b) / 255;
+	c->a = 1.0;
+	CGContextBeginPath(c->c);
+}
+
+void uiDrawBeginPathRGBA(uiDrawContext *c, uint8_t r, uint8_t g, uint8_t b, uint8_t a)
+{
+	c->useRGB = YES;
+	c->r = ((CGFloat) r) / 255;
+	c->g = ((CGFloat) g) / 255;
+	c->b = ((CGFloat) b) / 255;
+	c->a = ((CGFloat) a) / 255;
+	CGContextBeginPath(c->c);
+}
+
+void uiDrawMoveTo(uiDrawContext *c, intmax_t x, intmax_t y)
+{
+	CGContextMoveToPoint(c->c, x, y);
+}
+
+void uiDrawLineTo(uiDrawContext *c, intmax_t x, intmax_t y)
+{
+	CGContextAddLineToPoint(c->c, x, y);
+}
+
+void uiDrawRectangle(uiDrawContext *c, intmax_t x, intmax_t y, intmax_t width, intmax_t height)
+{
+	CGContextAddRect(c->c, TODO(x, y, width, height));
+}
+
+void uiDrawArcTo(uiDrawContext *c, intmax_t xCenter, intmax_t yCenter, intmax_t radius, double startAngle, double endAngle, int lineFromCurrentPointToStart)
+{
+	if (!lineFromCurrentPointToStart) {
+		// TODO
+	}
+	CGContextAddArc(c->c,
+		xCenter, yCenter,
+		radius,
+		startAngle, endAngle,
+		0);
+}
+
+void uiDrawBezierTo(uiDrawContext *c, intmax_t c1x, intmax_t c1y, intmax_t c2x, intmax_t c2y, intmax_t endX, intmax_t endY)
+{
+	CGContextAddCurveToPoint(c->c,
+		c1x, c1y,
+		c2x, c2y,
+		endX, endY);
+}
+
+void uiDrawCloseFigure(uiDrawContext *c)
+{
+	CGContextClosePath(c->c);
+}
+
+void uiDrawStroke(uiDrawContext *c, uiDrawStrokeParams *p)
+{
+	switch (p->Cap) {
+	case uiDrawLineCapFlat:
+		CGContextSetLineCap(c->c, kCGLineCapButt);
+		break;
+	case uiDrawLineCapRound:
+		CGContextSetLineCap(c->c, kCGLineCapRound);
+		break;
+	case uiDrawLineCapSquare:
+		CGContextSetLineCap(c->c, kCGLineCapSquare);
+		break;
+	}
+	switch (p->Join) {
+	case uiDrawLineJoinMiter:
+		CGContextSetLineJoin(c->cr, kCGLineJoinMiter);
+		CGContextSetMiterLimit(c->c, p->MiterLimit);
+		break;
+	case uiDrawLineJoinRound:
+		CGContextSetLineJoin(c->cr, kCGLineJoinRound);
+		break;
+	case uiDrawLineJoinBevel:
+		CGContextSetLineJoin(c->cr, kCGLineJoinBevel);
+		break;
+	}
+	CGContextSetLineWidth(c->c, p->Thickness);
+	if (c->useRGB)
+		CGContextSetRGBStrokeColor(c->c, c->r, c->g, c->b, c->a);
+	else {
+		// TODO
+	}
+	CGContextStrokePath(c->cr);
+}
+
+void uiDrawFill(uiDrawContext *c, uiDrawFillMode mode)
+{
+	if (c->useRGB)
+		CGContextSetRGBFillColor(c->c, c->r, c->g, c->b, c->a);
+	else {
+		// TODO
+	}
+	switch (mode) {
+	case uiDrawFillModeWinding:
+		CGContextFillPath(c->c);
+		break;
+	case uiDrawFillModeAlternate:
+		CGContextEOFillPath(c->c);
+		break;
+	}
+}
diff --git a/macarea/ui.h b/macarea/ui.h
new file mode 100644
index 00000000..4cc6097d
--- /dev/null
+++ b/macarea/ui.h
@@ -0,0 +1,138 @@
+// 4 september 2015
+
+typedef struct uiArea uiArea;
+typedef struct uiAreaHandler uiAreaHandler;
+typedef struct uiAreaDrawParams uiAreaDrawParams;
+
+typedef struct uiDrawContext uiDrawContext;
+
+struct uiAreaHandler {
+	void (*Draw)(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
+	uintmax_t (*HScrollMax)(uiAreaHandler *, uiArea *);
+	uintmax_t (*VScrollMax)(uiAreaHandler *, uiArea *);
+};
+
+struct uiAreaDrawParams {
+	uiDrawContext *Context;
+
+	intmax_t ClientWidth;
+	intmax_t ClientHeight;
+
+	intmax_t ClipX;
+	intmax_t ClipY;
+	intmax_t ClipWidth;
+	intmax_t ClipHeight;
+
+	int DPIX;
+	int DPIY;
+
+	intmax_t HScrollPos;
+	intmax_t VScrollPos;
+};
+
+// TODO proper sources
+// TODO dotting/dashing
+
+typedef struct uiDrawStrokeParams uiDrawStrokeParams;
+typedef enum uiDrawLineCap uiDrawLineCap;
+typedef enum uiDrawLineJoin uiDrawLineJoin;
+typedef enum uiDrawFillMode uiDrawFillMode;
+
+enum uiDrawLineCap {
+	uiDrawLineCapFlat,
+	uiDrawLineCapRound,
+	uiDrawLineCapSquare,
+};
+
+enum uiDrawLineJoin {
+	uiDrawLineJoinMiter,
+	uiDrawLineJoinRound,
+	uiDrawLineJoinBevel,
+};
+
+// this is the default for botoh cairo and GDI
+// Core Graphics doesn't explicitly specify a default, but NSBezierPath allows you to choose one, and this is the initial value
+// so we're good to use it too!
+#define uiDrawDefaultMiterLimit 10.0
+
+enum uiDrawFillMode {
+	uiDrawFillModeWinding,
+	// TODO rename to EvenOdd?
+	uiDrawFillModeAlternate,
+};
+
+struct uiDrawStrokeParams {
+	uiDrawLineCap Cap;
+	uiDrawLineJoin Join;
+	intmax_t Thickness;
+	double MiterLimit;
+};
+
+void uiDrawBeginPathRGB(uiDrawContext *, uint8_t, uint8_t, uint8_t);
+// TODO verify these aren't alpha premultiplied anywhere
+void uiDrawBeginPathRGBA(uiDrawContext *, uint8_t, uint8_t, uint8_t, uint8_t);
+
+void uiDrawMoveTo(uiDrawContext *, intmax_t, intmax_t);
+void uiDrawLineTo(uiDrawContext *, intmax_t, intmax_t);
+void uiDrawRectangle(uiDrawContext *, intmax_t, intmax_t, intmax_t, intmax_t);
+// notes: angles are both relative to 0 and go counterclockwise
+void uiDrawArcTo(uiDrawContext *, intmax_t, intmax_t, intmax_t, double, double, int);
+// TODO behavior when there is no initial point on Windows and OS X
+void uiDrawBezierTo(uiDrawContext *, intmax_t, intmax_t, intmax_t, intmax_t, intmax_t, intmax_t);
+void uiDrawCloseFigure(uiDrawContext *);
+
+void uiDrawStroke(uiDrawContext *, uiDrawStrokeParams *);
+void uiDrawFill(uiDrawContext *, uiDrawFillMode);
+
+// path functions
+// cairo			gdi						core graphics
+// move_to		MoveToEx				MoveToPoint
+// line_to			LineTo					AddLineToPoint
+// arc			Arc/ArcTo/AngleArc/Pie		AddArc/AddArcToPoint/AddEllipseInRect
+// arc_negative	Arc/ArcTo/AngleArc/Pie		AddArc/AddArcToPoint
+// curve_to		PolyBezier/PolyBezierTo		AddCurveToPoint
+// rectangle		Rectangle					AddRect
+// [arc functions?]	Chord					[arc functions?]
+// [combination]	RoundRect				[same way as cairo?]
+// [TODO pango]	TextOut/ExtTextOut			[TODO core text]
+// [TODO]		[TODO]					AddQuadCurveToPoint
+
+// on sources:
+// cairo:
+// - RGB
+// - RGBA
+// - images
+// - linear gradients, RGB or RGBA
+// - rounded gradients, RGB or RGBA
+// gdi:
+// - RGB
+// - hatches
+// - images
+// we can create a linear gradient image, but RGB only, and of finite size
+// core graphics:
+// - arbitrary patterns
+// - solid colors, arbitrary spaces
+// - shadows
+
+// arcs
+// cairo_arc/arc_negative
+// - parameters: center, radius, angle1 radians, angle2 radins
+// - if angle2 < angle1, TODO
+// - if angle2 > angle1, TODO
+// - line segment from current point to beginning of arc
+// - arc: clockwise, arc_negative: counterclockwise
+// - circular
+// GDI Arc/Pie
+// - parameters: bounding box, start point, end point
+// - current position not used/changed
+// - either clockwise or counterclockwise
+// - elliptical
+// GDI ArcTo
+// - same as Arc except line segment from current point to beginning of arc
+// - there does not appear to be a PieTo
+// GDI AngleArc
+// - parameters: center, radius, angle1 degrees, angle2 degrees
+// - line segment from current position to beginning of arc
+// - counterclockwise
+// - circular
+// - can be used to draw pies too; MSDN example demonstrates
diff --git a/winarea/ui.h b/winarea/ui.h
index 387a7f1f..4cc6097d 100644
--- a/winarea/ui.h
+++ b/winarea/ui.h
@@ -55,8 +55,6 @@ enum uiDrawLineJoin {
 // so we're good to use it too!
 #define uiDrawDefaultMiterLimit 10.0
 
-// TODOs
-// - os x: FillPath/EOFillPath functions
 enum uiDrawFillMode {
 	uiDrawFillModeWinding,
 	// TODO rename to EvenOdd?
@@ -71,6 +69,7 @@ struct uiDrawStrokeParams {
 };
 
 void uiDrawBeginPathRGB(uiDrawContext *, uint8_t, uint8_t, uint8_t);
+// TODO verify these aren't alpha premultiplied anywhere
 void uiDrawBeginPathRGBA(uiDrawContext *, uint8_t, uint8_t, uint8_t, uint8_t);
 
 void uiDrawMoveTo(uiDrawContext *, intmax_t, intmax_t);