Use clipping to improve performance in the slower operations

The port to cairo is a lot slower (in a xo) than using the old
primitives. Previously we was painting all the screen in most of
the operations. This patch calculate and apply clip over most of them
and add comments "TODO: clip" in the remaining.

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>

1 files changed, 17 insertions, 20 deletions

diff --git a/Desenho.py b/Desenho.py
index f575b83..d7f08fa 100644
--- a/Desenho.py
+++ b/Desenho.py
@@ -98,6 +98,10 @@ class Desenho:
         self._rainbow_counter = 0
 
         self.points = []
+        self._last_points_used = self.points
+
+    def clear_control_points(self):
+        self._last_points_used = []
 
     def line(self, widget, coords, temp):
         """Draw line.
@@ -118,6 +122,7 @@ class Desenho:
         ctx.move_to(widget.oldx, widget.oldy)
         ctx.line_to(coords[0], coords[1])
         ctx.stroke()
+        # TODO: clip
         widget.queue_draw()
 
     def eraser(self, widget, coords, last):
@@ -172,7 +177,7 @@ class Desenho:
         widget.drawing_ctx.paint()
         widget.drawing_ctx.restore()
 
-        widget.queue_draw()
+        widget.queue_draw_area(dx, dy, width, height)
 
     def rainbow(self, widget, coords, last):
         """Paint with rainbow.
@@ -288,7 +293,7 @@ class Desenho:
         if last:
             self._draw_polygon(widget, True, False, self.points, False,
                     rounded)
-
+        self.clear_control_points()
         if last:
             x = min(coords[0], last[0])
             width = max(coords[0], last[0]) - x
@@ -297,8 +302,6 @@ class Desenho:
             # We add size to avoid drawing dotted lines
             widget.queue_draw_area(x - size, y - size,
                 width + size * 2, height + size * 2)
-        else:
-            widget.queue_draw()
 
     def square(self, widget, event, coords, temp, fill):
         """Draw a square.
@@ -309,21 +312,10 @@ class Desenho:
             @param  temp -- switch between drawing context and temp context
             @param  fill -- Fill object
         """
-        if temp == True:
-            ctx = widget.temp_ctx
-        else:
-            ctx = widget.drawing_ctx
 
         x, y, dx, dy, = self.adjust(widget, coords)
-
-        ctx.rectangle(x, y, dx, dy)
-        if fill == True:
-            ctx.set_source_rgba(*widget.tool['cairo_fill_color'])
-            ctx.fill_preserve()
-        ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
-        ctx.set_line_width(widget.tool['line size'])
-        ctx.stroke()
-        widget.queue_draw_area(x, y, dx, dy)
+        points = [(x, y), (x + dx, y), (x + dx, y + dy), (x, y + dy)]
+        self._draw_polygon(widget, temp, fill, points)
 
     def _draw_polygon(self, widget, temp, fill, points, closed=True,
             rounded=False):
@@ -359,7 +351,9 @@ class Desenho:
         ctx.set_line_width(widget.tool['line size'])
         ctx.stroke()
         ctx.restore()
-        widget.queue_draw()
+        self._last_points_used.extend(points)
+        area = widget.calculate_damaged_area(self._last_points_used)
+        widget.queue_draw_area(*area)
 
     def triangle(self, widget, coords, temp, fill):
         """Draw a triangle.
@@ -522,6 +516,7 @@ class Desenho:
         ctx.stroke()
         ctx.restore()
 
+        # TODO: clip
         widget.queue_draw()
 
     def circle(self, widget, coords, temp, fill):
@@ -554,6 +549,7 @@ class Desenho:
         ctx.set_source_rgba(*widget.tool['cairo_stroke_color'])
         ctx.stroke()
         ctx.restore()
+        # TODO: clip
         widget.queue_draw()
 
     def clear(self, widget):
@@ -628,7 +624,7 @@ class Desenho:
                 buf.set_text('')
 
             widget.enable_undo()
-
+            # TODO: clip
             widget.queue_draw()
 
     def selection(self, widget, coords):
@@ -640,6 +636,7 @@ class Desenho:
 
         x, y, dx, dy = self.adjust(widget, coords, True)
         widget.set_selection_bounds(x, y, dx, dy)
+        # TODO: clip
         widget.queue_draw()
 
     def move_selection(self, widget, coords):
@@ -754,7 +751,7 @@ class Desenho:
         widget.desenha = True
         # Display the polygon open in the temp canvas
         self._draw_polygon(widget, True, False, self.points, closed=False)
-        widget.queue_draw()
+        self.clear_control_points()
 
     def adjust(self, widget, coords, locked=False):
         width, height = widget.window.get_size()