src/front_card_image.py

from PIL import Image, ImageDraw, ImageFont
from io import BytesIO

from src.constants import front_card_img_dict

# Pixel position information for each area of the card image
# Picture
PICTURE_LT_XY = (65, 188)
PICTURE_RB_XY = (802, 925)
PICTURE_SIZE = (PICTURE_RB_XY[0] - PICTURE_LT_XY[0], PICTURE_RB_XY[1] - PICTURE_LT_XY[1])

# Title
# Create some margin
TITLE_LT_XY = (65, 45) 
TITLE_RB_XY = (647, 132)
TITLE_SIZE = (TITLE_RB_XY[0] - TITLE_LT_XY[0], TITLE_RB_XY[1] - TITLE_LT_XY[1])

# Main Body of Description
DESCRIPTION_LT_XY = (46, 972)
DESCRIPTION_RB_XY = (810, 1174)
DESCRIPTION_SIZE = (DESCRIPTION_RB_XY[0] - DESCRIPTION_LT_XY[0], DESCRIPTION_RB_XY[1] - DESCRIPTION_LT_XY[1])

# Font information
# Ming Typeface
font_selif_path = 'data/fonts/SourceHanSerif-Bold.otf'
# Gothic Typeface
font_sanselif_path = 'data/fonts/SourceHanSans-Bold.otf'

def crop_center(pil_img, crop_width, crop_height):
    img_width, img_height = pil_img.size
    return pil_img.crop(((img_width - crop_width) // 2,
                         (img_height - crop_height) // 2,
                         (img_width + crop_width) // 2,
                         (img_height + crop_height) // 2))
    
def crop_max_square(pil_img):
    return crop_center(pil_img, min(pil_img.size), min(pil_img.size))
    
def create_card_image(card_frame_bytearray, img_bytearray, option_dict):

    # Loading and Cropping of Picture
    picture_img = Image.open(img_bytearray)
    picture_img = crop_max_square(picture_img)
    picture_img = picture_img.resize(PICTURE_SIZE)

    # Loading of Card Frame
    card_img = Image.open(card_frame_bytearray)

    # Embedding a Picture in the Card
    card_img.paste(picture_img, PICTURE_LT_XY)

    ## Preparing for editting the card image
    card_imgdraw = ImageDraw.Draw(card_img)

    # Embedding the Title
    # (Support for multiple lines if needed)
    title_font_size = 100
    while True:
        title_font = ImageFont.truetype(font_selif_path, title_font_size)
        title_bbox = card_imgdraw.textbbox(TITLE_LT_XY , option_dict['タイトル'], title_font)
        
        if (title_bbox[2] <= TITLE_RB_XY[0] and title_bbox[3] <= TITLE_RB_XY[1]) or title_font_size <= 30:
            break
        title_font_size -= 1

    card_imgdraw.text((TITLE_LT_XY[0], int((TITLE_LT_XY[1] + TITLE_RB_XY[1]) / 2)), option_dict['タイトル'], fill='black', font=title_font, anchor='lm')

    # Embedding the Description Text
    description_font = ImageFont.truetype(font_sanselif_path, 40)

    description_list = []
    description_length = len(option_dict['説明文'])
    temp_start = 0
    for i in range(description_length):
        temp_end = i
        description_line_bbox = card_imgdraw.textbbox((0, 0), option_dict['説明文'][temp_start:temp_end+1], description_font)
        if description_line_bbox[2] > DESCRIPTION_SIZE[0]:
            description_list.append(option_dict['説明文'][temp_start:temp_end])
            temp_start = i

    description_list.append(option_dict['説明文'][temp_start:])
    description_display = '\n'.join(description_list)

    card_imgdraw.text(DESCRIPTION_LT_XY, description_display, fill='black', font=description_font)

    # Outputting Binary Data
    output_img_bytearray = BytesIO()
    card_img.convert('RGB').save(output_img_bytearray, "JPEG", quality=95)
    output_img_bytearray.seek(0) # Seek to the beginning of the image, otherwise it results in empty data

    return output_img_bytearray