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Code Issues 25 Releases Wiki Activity

Fixed #28576 -- Added color interpretation method to GDALBand.

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Niall Dalton 2017-09-18 20:39:36 -04:00 committed by Tim Graham
parent 52eb5b289e
commit 4fe6588da3
7 changed files with 55 additions and 1 deletions
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1
AUTHORS
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@ -591,6 +591,7 @@ answer newbie questions, and generally made Django that much better:
Nebojša Dorđević
Ned Batchelder <http://www.nedbatchelder.com/>
Nena Kojadin <nena@kiberpipa.org>
Niall Dalton <niall.dalton12@gmail.com>
Niall Kelly <duke.sam.vimes@gmail.com>
Nick Efford <nick@efford.org>
Nick Lane <nick.lane.au@gmail.com>

1
django/contrib/gis/gdal/prototypes/raster.py
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@ -75,6 +75,7 @@ get_band_index = int_output(std_call('GDALGetBandNumber'), [c_void_p])
get_band_description = const_string_output(std_call('GDALGetDescription'), [c_void_p])
get_band_ds = voidptr_output(std_call('GDALGetBandDataset'), [c_void_p])
get_band_datatype = int_output(std_call('GDALGetRasterDataType'), [c_void_p])
get_band_color_interp = int_output(std_call('GDALGetRasterColorInterpretation'), [c_void_p])
get_band_nodata_value = double_output(std_call('GDALGetRasterNoDataValue'), [c_void_p, POINTER(c_int)])
set_band_nodata_value = void_output(std_call('GDALSetRasterNoDataValue'), [c_void_p, c_double])
if GDAL_VERSION >= (2, 1):

11
django/contrib/gis/gdal/raster/band.py
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@ -6,7 +6,9 @@ from django.contrib.gis.gdal.raster.base import GDALRasterBase
from django.contrib.gis.shortcuts import numpy
from django.utils.encoding import force_text
from .const import GDAL_INTEGER_TYPES, GDAL_PIXEL_TYPES, GDAL_TO_CTYPES
from .const import (
GDAL_COLOR_TYPES, GDAL_INTEGER_TYPES, GDAL_PIXEL_TYPES, GDAL_TO_CTYPES,
)
class GDALBand(GDALRasterBase):
@ -168,6 +170,13 @@ class GDALBand(GDALRasterBase):
dtype = GDAL_PIXEL_TYPES[dtype]
return dtype
def color_interp(self, as_string=False):
"""Return the GDAL color interpretation for this band."""
color = capi.get_band_color_interp(self._ptr)
if as_string:
color = GDAL_COLOR_TYPES[color]
return color
def data(self, data=None, offset=None, size=None, shape=None, as_memoryview=False):
"""
Read or writes pixel values for this band. Blocks of data can

21
django/contrib/gis/gdal/raster/const.py
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@ -44,6 +44,27 @@ GDAL_RESAMPLE_ALGORITHMS = {
'Mode': 6,
}
# See http://www.gdal.org/gdal_8h.html#ace76452d94514561fffa8ea1d2a5968c
GDAL_COLOR_TYPES = {
0: 'GCI_Undefined', # Undefined, default value, i.e. not known
1: 'GCI_GrayIndex', # Greyscale
2: 'GCI_PaletteIndex', # Paletted
3: 'GCI_RedBand', # Red band of RGBA image
4: 'GCI_GreenBand', # Green band of RGBA image
5: 'GCI_BlueBand', # Blue band of RGBA image
6: 'GCI_AlphaBand', # Alpha (0=transparent, 255=opaque)
7: 'GCI_HueBand', # Hue band of HLS image
8: 'GCI_SaturationBand', # Saturation band of HLS image
9: 'GCI_LightnessBand', # Lightness band of HLS image
10: 'GCI_CyanBand', # Cyan band of CMYK image
11: 'GCI_MagentaBand', # Magenta band of CMYK image
12: 'GCI_YellowBand', # Yellow band of CMYK image
13: 'GCI_BlackBand', # Black band of CMLY image
14: 'GCI_YCbCr_YBand', # Y Luminance
15: 'GCI_YCbCr_CbBand', # Cb Chroma
16: 'GCI_YCbCr_CrBand', # Cr Chroma, also GCI_Max
}
# Fixed base path for buffer-based GDAL in-memory files.
VSI_FILESYSTEM_BASE_PATH = '/vsimem/'

16
docs/ref/contrib/gis/gdal.txt
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@ -1551,6 +1551,22 @@ blue.
``GDT_UInt32``, ``GDT_Int32``, ``GDT_Float32``, ``GDT_Float64``,
``GDT_CInt16``, ``GDT_CInt32``, ``GDT_CFloat32``, and ``GDT_CFloat64``.
.. method:: color_interp(as_string=False)
.. versionadded:: 2.0
The color interpretation for the band, as an integer between 0and 16.
If ``as_string`` is ``True``, the data type is returned as a string
with the following possible values:
``GCI_Undefined``, ``GCI_GrayIndex``, ``GCI_PaletteIndex``,
``GCI_RedBand``, ``GCI_GreenBand``, ``GCI_BlueBand``, ``GCI_AlphaBand``,
``GCI_HueBand``, ``GCI_SaturationBand``, ``GCI_LightnessBand``,
``GCI_CyanBand``, ``GCI_MagentaBand``, ``GCI_YellowBand``,
``GCI_BlackBand``, ``GCI_YCbCr_YBand``, ``GCI_YCbCr_CbBand``, and
``GCI_YCbCr_CrBand``. ``GCI_YCbCr_CrBand`` also represents ``GCI_Max``
because both correspond to the integer 16, but only ``GCI_YCbCr_CrBand``
is returned as a string.
.. method:: data(data=None, offset=None, size=None, shape=None)
The accessor to the pixel values of the ``GDALBand``. Returns the complete

4
docs/releases/2.0.txt
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@ -144,6 +144,10 @@ Minor features
GDAL's internal virtual filesystem. Rasters can now be :ref:`created from and
converted to binary data <gdal-raster-vsimem>` in-memory.
* The new :meth:`GDALBand.color_interp()
<django.contrib.gis.gdal.GDALBand.color_interp>` method returns the color
interpretation for the band.
:mod:`django.contrib.messages`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2
tests/gis_tests/gdal_tests/test_raster.py
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@ -562,6 +562,8 @@ class GDALBandTests(SimpleTestCase):
self.assertEqual(self.band.description, '')
self.assertEqual(self.band.datatype(), 1)
self.assertEqual(self.band.datatype(as_string=True), 'GDT_Byte')
self.assertEqual(self.band.color_interp(), 1)
self.assertEqual(self.band.color_interp(as_string=True), 'GCI_GrayIndex')
self.assertEqual(self.band.nodata_value, 15)
if numpy:
data = self.band.data()