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Backport PR #21294 on branch v3.5.x (Disable blitting on GTK4 backends) #21304

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Merged
merged 1 commit into from
Oct 7, 2021
Merged

Backport PR #21294 on branch v3.5.x (Disable blitting on GTK4 backends) #21304

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1 change: 1 addition & 0 deletions lib/matplotlib/backends/backend_gtk4.py
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,7 @@ def _mpl_to_gtk_cursor(mpl_cursor):

class FigureCanvasGTK4(Gtk.DrawingArea, FigureCanvasBase):
required_interactive_framework = "gtk4"
supports_blit = False
_timer_cls = TimerGTK4
_context_is_scaled = False

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56 changes: 12 additions & 44 deletions lib/matplotlib/backends/backend_gtk4agg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,67 +8,35 @@
from . import backend_agg, backend_gtk4
from .backend_cairo import cairo
from .backend_gtk4 import Gtk, _BackendGTK4
from matplotlib import transforms


class FigureCanvasGTK4Agg(backend_gtk4.FigureCanvasGTK4,
backend_agg.FigureCanvasAgg):
def __init__(self, figure):
backend_gtk4.FigureCanvasGTK4.__init__(self, figure)
self._bbox_queue = []

def on_draw_event(self, widget, ctx):
scale = self.device_pixel_ratio
allocation = self.get_allocation()
w = allocation.width * scale
h = allocation.height * scale

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
Gtk.render_background(
self.get_style_context(), ctx,
allocation.x, allocation.y,
allocation.width, allocation.height)

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)
image.set_device_scale(scale, scale)
ctx.set_source_surface(image, x / scale, y / scale)
ctx.paint()

if len(self._bbox_queue):
self._bbox_queue = []
buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
np.asarray(self.renderer.buffer_rgba()))
height, width, _ = buf.shape
image = cairo.ImageSurface.create_for_data(
buf.ravel().data, cairo.FORMAT_ARGB32, width, height)
image.set_device_scale(scale, scale)
ctx.set_source_surface(image, 0, 0)
ctx.paint()

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

scale = self.device_pixel_ratio
allocation = self.get_allocation()
x = int(bbox.x0 / scale)
y = allocation.height - int(bbox.y1 / scale)
width = (int(bbox.x1) - int(bbox.x0)) // scale
height = (int(bbox.y1) - int(bbox.y0)) // scale

self._bbox_queue.append(bbox)
self.queue_draw_area(x, y, width, height)

def draw(self):
backend_agg.FigureCanvasAgg.draw(self)
super().draw()
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