Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/matplotlib/backends/backend_gtk3agg.py

@@ -0,0 +1,86 @@
+import numpy as np
+
+from .. import cbook
+try:
+    from . import backend_cairo
+except ImportError as e:
+    raise ImportError('backend Gtk3Agg requires cairo') from e
+from . import backend_agg, backend_gtk3
+from .backend_cairo import cairo
+from .backend_gtk3 import Gtk, _BackendGTK3
+from matplotlib import transforms
+
+
+class FigureCanvasGTK3Agg(backend_gtk3.FigureCanvasGTK3,
+                          backend_agg.FigureCanvasAgg):
+    def __init__(self, figure):
+        backend_gtk3.FigureCanvasGTK3.__init__(self, figure)
+        self._bbox_queue = []
+
+    def on_draw_event(self, widget, ctx):
+        """GtkDrawable draw event, like expose_event in GTK 2.X."""
+        allocation = self.get_allocation()
+        w, h = allocation.width, allocation.height
+
+        if not len(self._bbox_queue):
+            Gtk.render_background(
+                self.get_style_context(), ctx,
+                allocation.x, allocation.y,
+                allocation.width, allocation.height)
+            bbox_queue = [transforms.Bbox([[0, 0], [w, h]])]
+        else:
+            bbox_queue = self._bbox_queue
+
+        ctx = backend_cairo._to_context(ctx)
+
+        for bbox in bbox_queue:
+            x = int(bbox.x0)
+            y = h - int(bbox.y1)
+            width = int(bbox.x1) - int(bbox.x0)
+            height = int(bbox.y1) - int(bbox.y0)
+
+            buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
+                np.asarray(self.copy_from_bbox(bbox)))
+            image = cairo.ImageSurface.create_for_data(
+                buf.ravel().data, cairo.FORMAT_ARGB32, width, height)
+            ctx.set_source_surface(image, x, y)
+            ctx.paint()
+
+        if len(self._bbox_queue):
+            self._bbox_queue = []
+
+        return False
+
+    def blit(self, bbox=None):
+        # If bbox is None, blit the entire canvas to gtk. Otherwise
+        # blit only the area defined by the bbox.
+        if bbox is None:
+            bbox = self.figure.bbox
+
+        allocation = self.get_allocation()
+        x = int(bbox.x0)
+        y = allocation.height - int(bbox.y1)
+        width = int(bbox.x1) - int(bbox.x0)
+        height = int(bbox.y1) - int(bbox.y0)
+
+        self._bbox_queue.append(bbox)
+        self.queue_draw_area(x, y, width, height)
+
+    def draw(self):
+        backend_agg.FigureCanvasAgg.draw(self)
+        super().draw()
+
+    def print_png(self, filename, *args, **kwargs):
+        # Do this so we can save the resolution of figure in the PNG file
+        agg = self.switch_backends(backend_agg.FigureCanvasAgg)
+        return agg.print_png(filename, *args, **kwargs)
+
+
+class FigureManagerGTK3Agg(backend_gtk3.FigureManagerGTK3):
+    pass
+
+
+@_BackendGTK3.export
+class _BackendGTK3Cairo(_BackendGTK3):
+    FigureCanvas = FigureCanvasGTK3Agg
+    FigureManager = FigureManagerGTK3Agg