/usr/lib/python2.7/dist-packages/ginga/aggw/ImageViewAgg.py is in python-ginga 2.6.1-2.
This file is owned by root:root, with mode 0o644.
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# ImageViewAgg.py -- a backend for Ginga using the aggdraw library
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
import numpy
from io import BytesIO
import aggdraw as agg
from . import AggHelp
from ginga import ImageView
from ginga.aggw.CanvasRenderAgg import CanvasRenderer
try:
import PIL.Image as PILimage
have_PIL = True
except ImportError:
have_PIL = False
class ImageViewAggError(ImageView.ImageViewError):
pass
class ImageViewAgg(ImageView.ImageViewBase):
def __init__(self, logger=None, rgbmap=None, settings=None):
ImageView.ImageViewBase.__init__(self, logger=logger,
rgbmap=rgbmap,
settings=settings)
self.surface = None
self._rgb_order = 'RGBA'
self.renderer = CanvasRenderer(self)
def get_surface(self):
return self.surface
def render_image(self, rgbobj, dst_x, dst_y):
"""Render the image represented by (rgbobj) at dst_x, dst_y
in the pixel space.
"""
if self.surface is None:
return
canvas = self.surface
self.logger.debug("redraw surface")
# get window contents as a buffer and load it into the AGG surface
rgb_buf = self.getwin_buffer(order=self._rgb_order)
canvas.fromstring(rgb_buf)
# for debugging
#self.save_rgb_image_as_file('/tmp/temp.png', format='png')
def configure_surface(self, width, height):
# create agg surface the size of the window
self.surface = agg.Draw("RGBA", (width, height), 'black')
# inform the base class about the actual window size
self.configure(width, height)
def get_image_as_array(self):
if self.surface is None:
raise ImageViewAggError("No AGG surface defined")
# TODO: could these have changed between the time that self.surface
# was last updated?
wd, ht = self.get_window_size()
# Get agg surface as a numpy array
surface = self.get_surface()
arr8 = numpy.fromstring(surface.tostring(), dtype=numpy.uint8)
arr8 = arr8.reshape((ht, wd, 4))
return arr8
def get_image_as_buffer(self, output=None):
if self.surface is None:
raise ImageViewAggError("No AGG surface defined")
obuf = output
if obuf is None:
obuf = BytesIO()
surface = self.get_surface()
obuf.write(surface.tostring())
return obuf
def get_rgb_image_as_buffer(self, output=None, format='png', quality=90):
if not have_PIL:
raise ImageViewAggError("Please install PIL to use this method")
if self.surface is None:
raise ImageViewAggError("No AGG surface defined")
obuf = output
if obuf is None:
obuf = BytesIO()
# Get current surface as an array
arr8 = self.get_image_as_array()
# make a PIL image
image = PILimage.fromarray(arr8)
image.save(obuf, format=format, quality=quality)
if not (output is None):
return None
return obuf.getvalue()
def get_rgb_image_as_bytes(self, format='png', quality=90):
buf = self.get_rgb_image_as_buffer(format=format, quality=quality)
return buf
def save_rgb_image_as_file(self, filepath, format='png', quality=90):
if not have_PIL:
raise ImageViewAggError("Please install PIL to use this method")
if self.surface is None:
raise ImageViewAggError("No AGG surface defined")
with open(filepath, 'w') as out_f:
self.get_rgb_image_as_buffer(output=out_f, format=format,
quality=quality)
self.logger.debug("wrote %s file '%s'" % (format, filepath))
def update_image(self):
# subclass implements this method to actually update a widget
# from the agg surface
self.logger.warning("Subclass should override this method")
return False
def set_cursor(self, cursor):
# subclass implements this method to actually set a defined
# cursor on a widget
self.logger.warning("Subclass should override this method")
def reschedule_redraw(self, time_sec):
# subclass implements this method to call delayed_redraw() after
# time_sec
self.delayed_redraw()
def get_rgb_order(self):
return self._rgb_order
#END
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