1 files changed, 101 insertions, 0 deletions
diff --git a/plugins/python/cglimpse/distro.py b/plugins/python/cglimpse/distro.py
new file mode 100644
index 0000000..5ffc523
--- /dev/null
+++ b/plugins/python/cglimpse/distro.py
@@ -0,0 +1,101 @@
+
+from .method import GlimpseMethod
+
+
+class ByteDistribution(GlimpseMethod):
+
+    def __init__(self, builder):
+        """Prepare a Shannon entropy display."""
+
+        super(ByteDistribution, self).__init__(builder)
+
+        button = builder.get_object('shannon_color')
+        button.connect('color-set', self._on_color_set)
+
+        self._on_color_set(button)
+
+        self._step = 0x80
+
+        self._v_legend = 'Quantity'
+        self._h_legend = 'Byte values'
+
+        self._x_range = [ 0, 0x20, 0x100 ]
+        self._y_range = [ 0, 25, 100 ]
+
+        self._values = {}
+
+
+    def _on_color_set(self, button):
+        """React on color chosen for the rendering."""
+
+        color = button.get_rgba()
+        self._color = [ color.red, color.green, color.blue, color.alpha ]
+        self._shadow_color = [ color.red * 0.5, color.green * 0.5, color.blue * 0.5, color.alpha ]
+
+
+    def format_legend(self, value, vert):
+        """Build the label used for a rule."""
+
+        if vert:
+            text = str(value)
+
+        else:
+
+            scale = [ ' kb', ' Mb', ' Gb', ' Tb' ]
+            suffix = ''
+
+            for i in range(len(scale)):
+
+                if value < 1024:
+                    break
+
+                value /= 1024
+                suffix = scale[i]
+
+            text = '%u%s' % (value, suffix)
+
+        return text
+
+
+    def update(self, data):
+        """Provide a description for the method."""
+
+        max_count = 0
+
+        self._values = {}
+
+        for i in range(256):
+            self._values[i] = 0
+
+        for b in data:
+
+            if b in self._values.keys():
+                self._values[b] += 1
+
+        for c in self._values.values():
+            if c > max_count:
+                max_count = c
+
+        self._y_range = [ 0, max_count / 4, max_count ]
+
+
+    def render(self, cr, area):
+        """Draw the bytes distribution for the current binary, if any."""
+
+        max_count = self._y_range[-1]
+
+        last_x = area[0]
+
+        cr.set_source_rgba(*self._shadow_color)
+        cr.set_source_rgba(*self._color)
+        cr.set_line_width(1)
+
+        for i in range(256):
+
+            x = area[0] + ((i + 1) * area[2]) / 256
+            h = (area[3] * self._values[i]) / max_count
+
+            cr.rectangle(last_x, area[1] + area[3] - h, x - last_x, h)
+            cr.fill()
+
+            last_x = x