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Cairo rendering for Qt5 #8771

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2abdcea
Qt5Cairo backend.
anntzer Jun 15, 2017
d4957ec
Qt4Cairo backend.
anntzer Jun 18, 2017
d2f2bc0
Update backends docs.
anntzer Jun 18, 2017
f884ffa
Update backends API docs.
anntzer Jun 18, 2017
bcb08e9
Let cairo track surface size; fix Pyside refcnt bug.
anntzer Jun 19, 2017
2eac3fa
Fix mandelbrot example.
anntzer Jun 20, 2017
138ba58
Make sure only one cairo binding is ever used; fix docs.
anntzer Jun 20, 2017
d96d104
No need to process_updates in gtk3.
anntzer Jul 23, 2017
5087c05
Qt dpi handling should be renderer-agnostic.
anntzer Aug 1, 2017
89a87d0
Fix vector output from cairo.
anntzer Aug 3, 2017
56854ae
In QtCairo, also save figures using cairo.
anntzer Aug 3, 2017
ab61783
Fix doc builds.
anntzer Aug 26, 2017
8946c38
Fix hidpi in qt5cairo.
anntzer Dec 29, 2017
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Fix vector output from cairo. 
Vector surfaces do not report their extents, so we need to pass them in
manually.
  • Loading branch information
@anntzer
anntzer committed Jan 9, 2018
commit 89a87d0be2064a42d8809f45dae131e5cca3663b
8 changes: 6 additions & 2 deletions lib/matplotlib/backends/backend_cairo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -106,7 +106,10 @@ def __init__(self, dpi):

def set_ctx_from_surface(self, surface):
self.gc.ctx = cairo.Context(surface)
self.set_width_height(surface.get_width(), surface.get_height())
# Although it may appear natural to automatically call
# `self.set_width_height(surface.get_width(), surface.get_height())`
# here (instead of having the caller do so separately), this would fail
# for PDF/PS/SVG surfaces, which have no way to report their extents.

def set_width_height(self, width, height):
self.width = width
Expand Down Expand Up @@ -441,9 +444,9 @@ def print_png(self, fobj, *args, **kwargs):
width, height = self.get_width_height()

renderer = RendererCairo(self.figure.dpi)
renderer.set_width_height(width, height)
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
renderer.set_ctx_from_surface(surface)
renderer.set_width_height(width, height)

self.figure.draw(renderer)
surface.write_to_png(fobj)
Expand Down Expand Up @@ -500,6 +503,7 @@ def _save(self, fo, fmt, **kwargs):
# surface.set_dpi() can be used
renderer = RendererCairo(self.figure.dpi)
renderer.set_ctx_from_surface(surface)
renderer.set_width_height(width_in_points, height_in_points)
ctx = renderer.gc.ctx

if orientation == 'landscape':
Expand Down
1 change: 1 addition & 0 deletions lib/matplotlib/backends/backend_qt5cairo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ def paintEvent(self, event):
surface = backend_cairo.cairo.ImageSurface(
backend_cairo.cairo.FORMAT_ARGB32, width, height)
self._renderer.set_ctx_from_surface(surface)
self._renderer.set_width_height(width, height)
self.figure.draw(self._renderer)
buf = surface.get_data()
qimage = QtGui.QImage(buf, width, height,
Expand Down