102 lines
3.4 KiB
Python
102 lines
3.4 KiB
Python
import base64
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import json
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import PIL.Image
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def create_zeroed_array(length):
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output=[]
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for _ in range(length):
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output.append(0)
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return output
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class Project:
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def __init__(self):
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self.chars={}
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self.char_res=(0,0)
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self.path=None
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self.export_path=None
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self.loaded=False
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self.modified=False
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def load(self,path):
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with open(path, "r", encoding="utf-8") as f:
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project_data = json.load(f)
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if not "char_width" in project_data or not "char_height" in project_data:
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raise AttributeError("Character metrics information not found")
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if not isinstance(project_data["char_width"],int) or not isinstance(project_data["char_height"],int):
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raise AttributeError("Invalid character metrics type, expected int")
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if not "chars" in project_data:
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raise AttributeError("Character data not found")
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if not isinstance(project_data["chars"],dict):
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raise AttributeError("Invalid character data type, expected object")
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self.chars=project_data["chars"]
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self.char_res=(project_data["char_width"],project_data["char_height"])
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self.path=path
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self.loaded=True
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def save(self,path):
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# save project data to file
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with open(path, "w", encoding="utf-8") as f:
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json.dump({
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"char_width": self.char_res[0],
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"char_height": self.char_res[1],
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"chars": self.chars
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}, f, indent=4, ensure_ascii=False)
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self.path=path
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self.loaded=True
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def export(self,path):
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chars = tuple(self.chars.items())
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# there will be 256 characters per page
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last_char_idx = len(chars) - 1
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page_res = (self.char_res[0] * 16,self.char_res[1] * 16)
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pages={}
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for char_idx, char in enumerate(chars):
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char_id=ord(char[0])
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page=char_id//256
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char_offset_in_page=char_id-page*256
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if not page in pages:
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pages[page] = create_zeroed_array(page_res[0]*page_res[1])
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char_bitmap=self.decode_char(char[0])
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char_x=char_offset_in_page%16*self.char_res[0]
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char_y=char_offset_in_page//16*self.char_res[1]
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# put char_bitmap onto page_img at correct position
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for i in range(len(char_bitmap)):
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x=i//self.char_res[1]+char_x
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y=i%self.char_res[1]+char_y
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pages[page][y*page_res[0]+x]=char_bitmap[i]
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## save page
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for page,page_data in pages.items():
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for x in range(len(page_data)):
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page_data[x]*=255
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page_img = PIL.Image.frombytes("L",page_res,bytes(page_data))
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page_img.save(f"{path}/page_{page}.png")
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self.export_path=path
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def decode_char(self,char):
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result=[0 for _ in range(self.char_res[0]*self.char_res[1])]
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pixels=base64.b64decode(self.chars[char].encode("ascii"))
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pixel_index=0
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for pixel in pixels:
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if pixel_index>=len(result):
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break
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for x in range(8):
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if pixel_index>=len(result):
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break
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result[pixel_index]=(pixel>>(7-x))&1
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pixel_index+=1
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return result
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def does_char_exist(self,c):
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return chr(c) in self.chars
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