John Hunter wrote:
> It is useful to store the final pixel buffer (eg in a PNG) as RGBA
> because some people like to have some parts of their figure
> transparent to composite the figure with other images.
fair enough, and that's probably a really cool feature when you need it!
ken wrote:
> I was talking about the image-from-a-buffer business not helping us
> with WX 2.4/2.6 due to the RGBA to RGB conversion.
But it looks like RendererAgg has this a agg.tostring_rgb() method, so
we should be able to do change :
image.SetData(agg.tostring_rgb())
to
image.SetDataBuffer(agg.tostring_rgb())
If we make sure to keepthe string around. I haven't looked at your C++
code, but does it do something faster than RendererAgg.tostring_rgb() ?
Another thing that would be nice (for all Agg back-ends, I imagine), is
if we could replace this:
# agg => rgb -> image => bitmap => clipped bitmap => image
return wx.ImageFromBitmap(_clipped_image_as_bitmap(image, bbox))
with a RendererAgg._clipped_tostring_rgb(bbox)
So that we don't copy a bunch of RGB data we don't need.
even if we don't do that, I think
_clipped_image_as_bitmap()
could use wx.Image.GetSubImage(), rather than creating a bimtp of the
whole thing and blitting. untested code:
def _clipped_image_as_bitmap(image, bbox):
"""
Convert the region of a wx.Image described by bbox to a wx.Bitmap.
"""
l, b, width, height = bbox.get_bounds()
return wx.BitmapFromImage(image.GetSubImage(wxRect((l,b),(w,h))))
> RendererAgg appears to already have a buffer_rgba() method.
So we're all set for wxPython 2.7 -- very nice! I hope it doesn't make a
copy.
Is there a numpy_array_rgba method -- that could be nice, and would work
as a buffer, too. Maybe when we are ready to dump Numeric and numarray.
-Chris
--
Christopher Barker, Ph.D.
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