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"""
***************************************************************************
rgb2pct.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = "Victor Olaya"
__date__ = "August 2012"
__copyright__ = "(C) 2012, Victor Olaya"
import os
from qgis.PyQt.QtGui import QIcon
from qgis.core import (
QgsRasterFileWriter,
QgsProcessingException,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterNumber,
QgsProcessingParameterRasterDestination,
)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils
from processing.tools.system import isWindows
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class rgb2pct(GdalAlgorithm):
INPUT = "INPUT"
OUTPUT = "OUTPUT"
NCOLORS = "NCOLORS"
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterRasterLayer(self.INPUT, self.tr("Input layer"))
)
self.addParameter(
QgsProcessingParameterNumber(
self.NCOLORS,
self.tr("Number of colors"),
type=QgsProcessingParameterNumber.Type.Integer,
minValue=0,
maxValue=255,
defaultValue=2,
)
)
self.addParameter(
QgsProcessingParameterRasterDestination(self.OUTPUT, self.tr("RGB to PCT"))
)
def name(self):
return "rgbtopct"
def displayName(self):
return self.tr("RGB to PCT")
def group(self):
return self.tr("Raster conversion")
def groupId(self):
return "rasterconversion"
def icon(self):
return QIcon(
os.path.join(pluginPath, "images", "gdaltools", "24-to-8-bits.png")
)
def commandName(self):
return "rgb2pct"
def getConsoleCommands(self, parameters, context, feedback, executing=True):
out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
self.setOutputValue(self.OUTPUT, out)
raster = self.parameterAsRasterLayer(parameters, self.INPUT, context)
if raster is None:
raise QgsProcessingException(
self.invalidRasterError(parameters, self.INPUT)
)
input_details = GdalUtils.gdal_connection_details_from_layer(raster)
output_format = QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1])
if not output_format:
raise QgsProcessingException(self.tr("Output format is invalid"))
arguments = [
"-n",
str(self.parameterAsInt(parameters, self.NCOLORS, context)),
"-of",
output_format,
input_details.connection_string,
out,
]
if input_details.credential_options:
arguments.extend(input_details.credential_options_as_arguments())
return [
self.commandName() + (".bat" if isWindows() else ".py"),
GdalUtils.escapeAndJoin(arguments),
]
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