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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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## @file config_reader.py
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## @brief Reads and provides configuration values for the alpha-blending system.
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## @details
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## This module loads a JSON configuration file (`config.json`) and exposes
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## accessor methods that return typed values for physical projector parameters,
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## image metadata, blend settings, and runtime options.
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import json
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import os
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class ConfigReader(object):
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"""
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@brief A helper class for reading configuration values from config.json.
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@details
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The class loads parameters only once during initialization and provides
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getters which will be used by the MainAlphaBlender class.
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@see main_alpha_blender.py
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"""
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CONFIG_FILENAME = "config.json"
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def __init__(self):
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"""
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@brief This is the constructor and this loads config.json into memory if it exists.
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@details
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If the JSON file does not exist, default values will be used.
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"""
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self.__config = {}
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self._load_config()
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def _load_config(self):
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"""
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@brief Internal function to load JSON configuration.
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@details
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This function opens config.json (if present) and loads settings into a dictionary.
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For the missing files, this will not raise any error but defaults will be used instead.
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"""
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if not os.path.exists(self.CONFIG_FILENAME):
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print(f"Warning: {self.CONFIG_FILENAME} not found. Using defaults.")
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return
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with open(self.CONFIG_FILENAME, 'r') as f:
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self.__config = json.load(f)
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def getProjectedImageWidth(self):
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"""
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@brief This returns the physical width of the projected image.
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@details This is the width of *one* projector's image in centimeters.
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@return return Projected image width in float or 0 if not found or invalid.
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@see main_alpha_blender.py
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"""
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return float(self.__config.get("projected_image_width", 0))
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def getDistanceBetweenProjectors(self):
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"""
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@brief This returns the physical distance between projector lenses in centimeters.
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@details this is used to compute percentage of overlap between the two images.
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@return return Distance between projectors in float or 0 in case of wrong format.
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@see main_alpha_blender.py
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"""
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return float(self.__config.get("distance_between_projectors", 0))
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def getImageWidth(self):
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"""
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@brief this returns the pixel width of the input image.
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@return return the Pixel width (default 1920) in int.
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@see main_alpha_blender.py
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"""
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return int(self.__config.get("image_width", 1920))
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def getImageHeight(self):
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"""
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@brief this returns the pixel height of the input image.
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@return return the Pixel height (default 1080) in int.
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@see main_alpha_blender.py
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"""
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return int(self.__config.get("image_height", 1080))
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def getImageName(self):
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"""
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@brief this returns the file name of the image to process.
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@return return Input image path in string.
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@see main_alpha_blender.py
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"""
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return self.__config.get("image_name", "")
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def getSide(self):
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"""
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@brief This returns which projector side this instance represents.
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@details Valid values are `"left"` or `"right"`. Defaults to `"left"`.
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@return return the Blend side in lowercase in string i.e "left" or "right".
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@see main_alpha_blender.py
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"""
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return self.__config.get("side", "left").lower()
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def getGamma(self):
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"""
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@brief This returns the gamma value used for mask correction.
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@details Typical projector gamma is around 2.2.
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@return return Gamma value in float.
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@see main_alpha_blender.py
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"""
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return float(self.__config.get("gamma", 2.2))
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