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Commit5b74696

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Merge pull request#5718 from mdboom/image-interpolation
Rewrite of image infrastructure
2 parents18169b2 +c9b2425 commit5b74696

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@@ -0,0 +1,8 @@
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Change in the ``draw_image`` backend API
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----------------------------------------
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The ``draw_image`` method implemented by backends has changed its interface.
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This change is only relevant if the backend declares that it is able
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to transform images by returning ``True`` from ``option_scale_image``.
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See the ``draw_image`` docstring for more information.
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Improved image support
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----------------------
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Prior to version 2.0, matplotlib resampled images by first applying
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the color map and then resizing the result. Since the resampling was
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performed on the colored image, this introduced colors in the output
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image that didn't actually exist in the color map. Now, images are
8+
resampled first (and entirely in floating-point, if the input image is
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floating-point), and then the color map is applied.
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11+
In order to make this important change, the image handling code was
12+
almost entirely rewritten. As a side effect, image resampling uses
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less memory and fewer datatype conversions than before.
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The experimental private feature where one could "skew" an image by
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setting the private member ``_image_skew_coordinate`` has been
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removed. Instead, images will obey the transform of the axes on which
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they are drawn.

‎doc/users/whats_new/rcparams.rst‎

Lines changed: 12 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -19,10 +19,20 @@ Configuration (rcParams)
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|`svg.hashsalt`| see note|
2020
+----------------------------+--------------------------------------------------+
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22-
``svg.hashsalt``
23-
````````````````
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Added``svg.hashsalt`` key to rcParams
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```````````````````````````````````````
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2525
If ``svg.hashsalt`` is ``None`` (which it is by default), the svg
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backend uses ``uuid4`` to generate the hash salt. If it is not
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``None``, it must be a string that is used as the hash salt instead of
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``uuid4``. This allows for deterministic SVG output.
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Removed the ``svg.image_noscale`` rcParam
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`````````````````````````````````````````
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As a result of the extensive changes to image handling, the
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``svg.image_noscale`` rcParam has been removed. The same
36+
functionality may be achieved by setting ``interpolation='none'`` on
37+
individual images or globally using the ``image.interpolation``
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rcParam.

‎examples/api/demo_affine_image.py‎

100755100644
Lines changed: 4 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,3 @@
1-
#!/usr/bin/env python
2-
3-
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"""
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For the backends that supports draw_image with optional affine
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transform (e.g., agg, ps backend), the image of the output should
@@ -24,22 +21,15 @@ def get_image():
2421
returnZ
2522

2623

27-
defimshow_affine(ax,z,*kl,**kwargs):
28-
im=ax.imshow(z,*kl,**kwargs)
29-
x1,x2,y1,y2=im.get_extent()
30-
im._image_skew_coordinate= (x2,y1)
31-
returnim
32-
33-
3424
if1:
3525

3626
# image rotation
3727

38-
fig,(ax1,ax2)=plt.subplots(1,2)
28+
fig,ax1=plt.subplots(1,1)
3929
Z=get_image()
40-
im1=imshow_affine(ax1,Z,interpolation='none',
41-
origin='lower',
42-
extent=[-2,4,-3,2],clip_on=True)
30+
im1=ax1.imshow(Z,interpolation='none',
31+
origin='lower',
32+
extent=[-2,4,-3,2],clip_on=True)
4333

4434
trans_data2=mtransforms.Affine2D().rotate_deg(30)+ax1.transData
4535
im1.set_transform(trans_data2)
@@ -53,13 +43,3 @@ def imshow_affine(ax, z, *kl, **kwargs):
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5444
ax1.set_xlim(-3,5)
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ax1.set_ylim(-4,4)
56-
57-
# image skew
58-
59-
im2=ax2.imshow(Z,interpolation='none',
60-
origin='lower',
61-
extent=[-2,4,-3,2],clip_on=True)
62-
im2._image_skew_coordinate= (3,-2)
63-
64-
plt.show()
65-
#plt.savefig("demo_affine_image")

‎examples/images_contours_and_fields/interpolation_methods.py‎

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@@ -18,6 +18,7 @@
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'spline36','hanning','hamming','hermite','kaiser','quadric',
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'catrom','gaussian','bessel','mitchell','sinc','lanczos']
2020

21+
np.random.seed(0)
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grid=np.random.rand(4,4)
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2324
fig,axes=plt.subplots(3,6,figsize=(12,6),
@@ -26,7 +27,7 @@
2627
fig.subplots_adjust(hspace=0.3,wspace=0.05)
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2829
forax,interp_methodinzip(axes.flat,methods):
29-
ax.imshow(grid,interpolation=interp_method)
30+
ax.imshow(grid,interpolation=interp_method,cmap='viridis')
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ax.set_title(interp_method)
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plt.show()

‎examples/pylab_examples/demo_annotation_box.py‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -48,6 +48,7 @@
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arr=np.arange(100).reshape((10,10))
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im=OffsetImage(arr,zoom=2)
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im.image.axes=ax
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5253
ab=AnnotationBbox(im,xy,
5354
xybox=(-50.,50.),
@@ -62,9 +63,10 @@
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frommatplotlib._pngimportread_png
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fn=get_sample_data("grace_hopper.png",asfileobj=False)
65-
arr_lena=read_png(fn)
66+
arr_img=read_png(fn)
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67-
imagebox=OffsetImage(arr_lena,zoom=0.2)
68+
imagebox=OffsetImage(arr_img,zoom=0.2)
69+
imagebox.image.axes=ax
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ab=AnnotationBbox(imagebox,xy,
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xybox=(120.,-80.),

‎extern/agg24-svn/include/agg_span_image_filter_gray.h‎

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Original file line numberDiff line numberDiff line change
@@ -490,7 +490,7 @@ namespace agg
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fg_ptr = (const value_type*)base_type::source().next_y();
491491
}
492492

493-
fg>>=image_filter_shift;
493+
fg=color_type::downshift(fg,image_filter_shift);
494494
if(fg <0) fg =0;
495495
if(fg >color_type::full_value()) fg =color_type::full_value();
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span->v = (value_type)fg;

‎lib/matplotlib/__init__.py‎

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@@ -847,6 +847,7 @@ def matplotlib_fname():
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'savefig.extension': ('savefig.format',lambdax:x,None),
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'axes.color_cycle': ('axes.prop_cycle',lambdax:cycler('color',x),
849849
lambdax: [c.get('color',None)forcinx]),
850+
'svg.image_noscale': ('image.interpolation',None,None),
850851
}
851852

852853
_deprecated_ignore_map= {

‎lib/matplotlib/axes/_base.py‎

Lines changed: 1 addition & 44 deletions
Original file line numberDiff line numberDiff line change
@@ -2323,15 +2323,6 @@ def draw(self, renderer=None, inframe=False):
23232323
artists.remove(self._left_title)
23242324
artists.remove(self._right_title)
23252325

2326-
# add images to dsu if the backend supports compositing.
2327-
# otherwise, does the manual compositing without adding images to dsu.
2328-
iflen(self.images)<=1orrenderer.option_image_nocomposite():
2329-
_do_composite=False
2330-
else:
2331-
_do_composite=True
2332-
foriminself.images:
2333-
artists.remove(im)
2334-
23352326
ifself.figure.canvas.is_saving():
23362327
dsu= [(a.zorder,a)forainartists]
23372328
else:
@@ -2356,46 +2347,12 @@ def draw(self, renderer=None, inframe=False):
23562347
ifself.axisonandself._frameon:
23572348
self.patch.draw(renderer)
23582349

2359-
if_do_composite:
2360-
# make a composite image, blending alpha
2361-
# list of (mimage.Image, ox, oy)
2362-
2363-
zorder_images= [(im.zorder,im)foriminself.images
2364-
ifim.get_visible()]
2365-
zorder_images.sort(key=lambdax:x[0])
2366-
2367-
mag=renderer.get_image_magnification()
2368-
ims= [(im.make_image(mag),0,0,im.get_alpha())
2369-
forz,iminzorder_images]
2370-
2371-
l,b,r,t=self.bbox.extents
2372-
width=int(mag* ((np.round(r)+0.5)- (np.round(l)-0.5)))
2373-
height=int(mag* ((np.round(t)+0.5)- (np.round(b)-0.5)))
2374-
im=mimage.from_images(height,
2375-
width,
2376-
ims)
2377-
2378-
im.is_grayscale=False
2379-
l,b,w,h=self.bbox.bounds
2380-
# composite images need special args so they will not
2381-
# respect z-order for now
2382-
2383-
gc=renderer.new_gc()
2384-
gc.set_clip_rectangle(self.bbox)
2385-
gc.set_clip_path(mtransforms.TransformedPath(
2386-
self.patch.get_path(),
2387-
self.patch.get_transform()))
2388-
2389-
renderer.draw_image(gc,round(l),round(b),im)
2390-
gc.restore()
2391-
23922350
ifdsu_rasterized:
23932351
forzorder,aindsu_rasterized:
23942352
a.draw(renderer)
23952353
renderer.stop_rasterizing()
23962354

2397-
forzorder,aindsu:
2398-
a.draw(renderer)
2355+
mimage._draw_list_compositing_images(renderer,self,dsu)
23992356

24002357
renderer.close_group('axes')
24012358
self._cachedRenderer=renderer

‎lib/matplotlib/backend_bases.py‎

Lines changed: 9 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -515,7 +515,7 @@ def get_image_magnification(self):
515515
"""
516516
return1.0
517517

518-
defdraw_image(self,gc,x,y,im):
518+
defdraw_image(self,gc,x,y,im,trans=None):
519519
"""
520520
Draw the image instance into the current axes;
521521
@@ -531,7 +531,14 @@ def draw_image(self, gc, x, y, im):
531531
is the distance from bottom
532532
533533
*im*
534-
the :class:`matplotlib._image.Image` instance
534+
An NxMx4 array of RGBA pixels (of dtype uint8).
535+
536+
*trans*
537+
If the concrete backend is written such that
538+
`option_scale_image` returns `True`, an affine
539+
transformation may also be passed to `draw_image`. The
540+
backend should apply the transformation to the image
541+
before applying the translation of `x` and `y`.
535542
"""
536543
raiseNotImplementedError
537544

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