PaddleX/paddlex/modules/image_classification/dataset_checker/dataset_src/utils/visualizer.py

# copyright (c) 2024 PaddlePaddle Authors. All Rights Reserve.
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


import os
import numpy as np
import json
from pathlib import Path
from PIL import Image, ImageDraw, ImageFont

from ......utils.fonts import PINGFANG_FONT_FILE_PATH


def colormap(rgb=False):
    """
    Get colormap
    """
    color_list = np.array([
        0xFF, 0x00, 0x00, 0xCC, 0xFF, 0x00, 0x00, 0xFF, 0x66, 0x00, 0x66, 0xFF,
        0xCC, 0x00, 0xFF, 0xFF, 0x4D, 0x00, 0x80, 0xff, 0x00, 0x00, 0xFF, 0xB2,
        0x00, 0x1A, 0xFF, 0xFF, 0x00, 0xE5, 0xFF, 0x99, 0x00, 0x33, 0xFF, 0x00,
        0x00, 0xFF, 0xFF, 0x33, 0x00, 0xFF, 0xff, 0x00, 0x99, 0xFF, 0xE5, 0x00,
        0x00, 0xFF, 0x1A, 0x00, 0xB2, 0xFF, 0x80, 0x00, 0xFF, 0xFF, 0x00, 0x4D
    ]).astype(np.float32)
    color_list = (color_list.reshape((-1, 3)))
    if not rgb:
        color_list = color_list[:, ::-1]
    return color_list.astype('int32')


def font_colormap(color_index):
    """
    Get font colormap
    """
    dark = np.array([0x14, 0x0E, 0x35])
    light = np.array([0xFF, 0xFF, 0xFF])
    light_indexs = [0, 3, 4, 8, 9, 13, 14, 18, 19]
    if color_index in light_indexs:
        return light.astype('int32')
    else:
        return dark.astype('int32')


def draw_label(image, label, label_map_dict):
    """ Draw label on image """
    image = image.convert('RGB')
    image_size = image.size
    draw = ImageDraw.Draw(image)
    min_font_size = int(image_size[0] * 0.02)
    max_font_size = int(image_size[0] * 0.05)
    for font_size in range(max_font_size, min_font_size - 1, -1):
        font = ImageFont.truetype(
            PINGFANG_FONT_FILE_PATH, font_size, encoding="utf-8")
        text_width_tmp, text_height_tmp = draw.textsize(
            label_map_dict[int(label)], font)
        if text_width_tmp <= image_size[0]:
            break
        else:
            font = ImageFont.truetype(PINGFANG_FONT_FILE_PATH, min_font_size)
    color_list = colormap(rgb=True)
    color = tuple(color_list[0])
    font_color = tuple(font_colormap(3))
    text_width, text_height = draw.textsize(label_map_dict[int(label)], font)

    rect_left = 3
    rect_top = 3
    rect_right = rect_left + text_width + 3
    rect_bottom = rect_top + text_height + 6

    draw.rectangle(
        [(rect_left, rect_top), (rect_right, rect_bottom)], fill=color)

    text_x = rect_left + 3
    text_y = rect_top
    draw.text(
        (text_x, text_y),
        label_map_dict[int(label)],
        fill=font_color,
        font=font)

    return image