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Using PangoCairo with PyGObject API [复制链接]

Rank: 4

发表于 2022-3-26 03:00:33 |显示全部楼层
本帖最后由 Seekladoom 于 2022-3-26 03:02 编辑

Source:
https://stackoverflow.com/questi ... -with-pygobject-api

I am porting a Python2 script that uses Pango for drawing text to a Cairo surface. It works fine using the old PyGtk API with the pangocairo package. My system (Debian Jesse) doesn't have Python3 packages for PyGtk and instead uses the newer Gtk+ libraries with the PyGObject API.

I want to create a pangocairo.CairoContext object but it seems to be missing in the new API. The PangoCairo package has a create_context() function but it generates a PangoContext object that doesn't have the methods I need.

So far I have this:
  1. import cairo
  2. from gi.repository import Pango
  3. from gi.repository import PangoCairo

  4. surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, 8, 8)
  5. ctx = cairo.Context(surf)
  6. pctx = PangoCairo.create_context(ctx) # Creates a PangoContext
  7. pctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL) # This fails
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The old Python2 code that works:
  1. import cairo
  2. import pango
  3. import pangocairo

  4. surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, 8, 8)
  5. ctx = cairo.Context(surf)
  6. pctx = pangocairo.CairoContext(ctx)
  7. pctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL)
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Does anyone have a solution for this? Is there any good documentation on how PangoCairo should be used with the new API?

Rank: 4

发表于 2022-3-26 03:02:47 |显示全部楼层
It looks like the library has been rearranged a bit. The Pango context (now Pango.Context) is retrieved from the Pango.Layout object now. Here is a working solution:
  1. import cairo
  2. from gi.repository import Pango
  3. from gi.repository import PangoCairo

  4. surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, 8, 8)
  5. ctx = cairo.Context(surf)
  6. layout = PangoCairo.create_layout(ctx)
  7. pctx = layout.get_context()

  8. fo = cairo.FontOptions()
  9. fo.set_antialias(cairo.ANTIALIAS_SUBPIXEL)
  10. PangoCairo.context_set_font_options(pctx, fo)
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