B
    0\P8                 @   s   d Z ddlZddlmZ ddlmZmZ dZdZdZ	dZ
dZdZdZd	d
 Zd!ddZdd Zdd ZG dd deZG dd dejZG dd dejZG dd deZG dd deZeejedd  eejd ede ed e dS )"a  
Blizzard Mipmap Format (.blp)
Jerome Leclanche <jerome@leclan.ch>

The contents of this file are hereby released in the public domain (CC0)
Full text of the CC0 license:
  https://creativecommons.org/publicdomain/zero/1.0/

BLP1 files, used mostly in Warcraft III, are not fully supported.
All types of BLP2 files used in World of Warcraft are supported.

The BLP file structure consists of a header, up to 16 mipmaps of the
texture

Texture sizes must be powers of two, though the two dimensions do
not have to be equal; 512x256 is valid, but 512x200 is not.
The first mipmap (mipmap #0) is the full size image; each subsequent
mipmap halves both dimensions. The final mipmap should be 1x1.

BLP files come in many different flavours:
* JPEG-compressed (type == 0) - only supported for BLP1.
* RAW images (type == 1, encoding == 1). Each mipmap is stored as an
  array of 8-bit values, one per pixel, left to right, top to bottom.
  Each value is an index to the palette.
* DXT-compressed (type == 1, encoding == 2):
- DXT1 compression is used if alpha_encoding == 0.
  - An additional alpha bit is used if alpha_depth == 1.
  - DXT3 compression is used if alpha_encoding == 1.
  - DXT5 compression is used if alpha_encoding == 7.
    N)BytesIO   )Image	ImageFile         c             C   s*   | d? d@ d> | d? d@ d> | d@ d> fS )N      r      ?   r    )ir   r   1lib/python3.7/site-packages/PIL/BlpImagePlugin.py
unpack_5651   s    r   Fc          	   C   s  t | d }t t t t f}xt|D ]}|d }td| |\}}}t|\}	}
}t|\}}}x`tdD ]R}xJtdD ]<}|d@ }|d? }d}|dkr|	|
|  }}}n|dkr|||  }}}n|dkrB||krd|	 | d }d|
 | d }d| | d }n$|	| d }|
| d }|| d }nR|dkr||krd| |	 d }d| |
 d }d| | d }nd	\}}}}|r|| ||||g q|| |||g qW qvW q,W |S )
zE
    input: one "row" of data (i.e. will produce 4*width pixels)
       z<HHI   r   r      r   r   )r   r   r   r   )len	bytearrayrangestructunpack_fromr   extend)dataalphablocksretblockidxcolor0color1bitsr0g0b0r1g1b1jr   Zcontrolargbr   r   r   decode_dxt19   sD    



 r.   c          	   C   s  t | d }t t t t f}xt|D ]}|d }| ||d  }td|}td|d\}}td|d\}t|\}	}
}t|\}}}xFtdD ]8}d}x,tdD ]}d| | d	 }|| }|rd}|dL }nd
}|dM }|d9 }|d	d| |  ? d@ }|dkr.|	|
|  }}}n|dkrJ|||  }}}nv|d	krd	|	 | d }d	|
 | d }d	| | d }n:|dkrd	| |	 d }d	| |
 d }d	| | d }|| ||||g qW qW q,W |S )zE
    input: one "row" of data (i.e. will produce 4*width pixels)
       z<8Bz<HHr   z<I   r   Fr   T      r   r   r   )r   r   r   r   r   r   r   )r   r   r   r   r   r"   r    r!   coder#   r$   r%   r&   r'   r(   r)   Zhighr   alphacode_indexr*   
color_coder+   r,   r-   r   r   r   decode_dxt3p   sH    




"r6   c          	   C   s  t | d }t t t t f}xt|D ]}|d }| ||d  }td|\}}td|d}|d |d d> B |d d> B |d d	> B }|d
 |d d> B }	td|d\}
}td|d\}t|
\}}}t|\}}}xtdD ]}xtdD ]}dd| |  }|dkr2|	|? d@ }n0|dkrR|	d? |d> d@ B }n||d ? d@ }|d
krr|}nt|dkr|}nd||krd| | |d |  d }n<|dkrd
}n,|dkrd}nd| | |d |  d }|dd| |  ? d@ }|d
kr|||  }}}n|dkr6|||  }}}nv|dkrrd| | d }d| | d }d| | d }n:|dkrd| | d }d| | d }d| | d }|| ||||g qW qW q,W |S )zG
    input: one "row" of data (i.e. will produce 4 * width pixels)
    r/   z<BBz<6Br   r   r   r   r      r   r   z<HHz<Ir0   r   r1      r   )r   r   r   r   r   r   r   )r   r   r   r   r   Za0Za1r"   Z
alphacode1Z
alphacode2r    r!   r3   r#   r$   r%   r&   r'   r(   r)   r   r4   Z	alphacoder*   r5   r+   r,   r-   r   r   r   decode_dxt5   s^    ,










$r9   c               @   s   e Zd ZdS )BLPFormatErrorN)__name__
__module____qualname__r   r   r   r   r:      s   r:   c               @   s(   e Zd ZdZdZdZdd Zdd ZdS )	BlpImageFilez 
    Blizzard Mipmap Format
    ZBLPzBlizzard Mipmap Formatc             C   s|   | j d| _|   | jdkr,d}d| _n.| jdkrLd}| jrDdnd| _ntd| j |d	| j d
| jd
dffg| _d S )Nr   s   BLP1BLP1ZRGBs   BLP2BLP2ZRGBAzBad BLP magic %r)r   r   r   r   )	fpreadmagic_read_blp_headermode_blp_alpha_depthr:   sizetile)selfdecoderr   r   r   _open   s    

zBlpImageFile._openc             C   s   t d| jd\| _t d| jd\| _t d| jd\| _t d| jd\| _t d| jd\| _t d| jd| _	| j
dkrt d| jd\| _t d| jd\| _t d| jd	| _t d| jd	| _d S )
Nz<ir   z<br   z<IIr   s   BLP1z<16I@   )r   unpackrA   rB   _blp_compression_blp_encodingrF   _blp_alpha_encoding	_blp_mipsZ_sizerC   _blp_subtype_blp_offsets_blp_lengths)rI   r   r   r   rD   	  s    
zBlpImageFile._read_blp_headerN)r;   r<   r=   __doc__formatZformat_descriptionrK   rD   r   r   r   r   r>      s
   r>   c               @   s(   e Zd ZdZdd Zdd Zdd ZdS )	_BLPBaseDecoderTc             C   sR   y.| j d | j d| _|   |   W n tjk
rL   tdY nX dS )Nr   r   zTruncated Blp file)r   r   )	fdseekrB   rC   rD   _loadr   errorIOError)rI   bufferr   r   r   decode  s    z_BLPBaseDecoder.decodec          	   C   sf   g }x\t dD ]P}y td| jd\}}}}W n tjk
rJ   P Y nX |||||f qW |S )N   z<4Br   )r   r   rM   rX   rB   r[   append)rI   r   r   r-   r,   r+   r*   r   r   r   _read_palette)  s     z_BLPBaseDecoder._read_palettec             C   s   t d| jd\| _t d| jd\| _t d| jd\| _t d| jd\| _t d| jd\| _t d| jd| _	| j
dkrt d| jd\| _t d| jd\| _t d| jd	| _t d| jd	| _d S )
Nz<ir   z<br   z<IIr   s   BLP1z<16IrL   )r   rM   rX   rB   rN   rO   rF   rP   rQ   rG   rC   rR   rS   rT   )rI   r   r   r   rD   3  s    
z _BLPBaseDecoder._read_blp_headerN)r;   r<   r=   Z	_pulls_fdr^   ra   rD   r   r   r   r   rW     s   

rW   c               @   s   e Zd Zdd Zdd ZdS )BLP1Decoderc       	      C   s   | j tkr|   n| j dkr| jdkrt }|  }t| j| j	d }xVyt
d|d\}W n t
jk
r~   P Y nX || \}}}}||||g qNW | t| qtd| j ntd| j d S )Nr   )r   r   r   z<BzUnsupported BLP encoding %rzUnsupported BLP compression %r)rN   BLP_FORMAT_JPEG_decode_jpeg_streamrO   r   ra   r   rX   rB   rT   r   rM   r[   r   
set_as_rawbytesr:   )	rI   r   palette_dataoffsetr-   r,   r+   r*   r   r   r   rZ   H  s&    



zBLP1Decoder._loadc             C   s   ddl m} td| jd\}| j|}| j| jd | j   | j| jd }|| }t	|}||}|j
| _
|j| _|j| _d S )Nr   )JpegImageFilez<Ir   )ZPIL.JpegImagePluginrj   r   rM   rX   rB   rS   tellrT   r   rH   rA   rE   )rI   rj   Zjpeg_header_sizeZjpeg_headerr   Zimager   r   r   rd   c  s    zBLP1Decoder._decode_jpeg_streamN)r;   r<   r=   rZ   rd   r   r   r   r   rb   F  s   rb   c               @   s   e Zd Zdd ZdS )BLP2Decoderc             C   s:  |   }t }| j| jd  | jdkr| jtkrt| j	| j
d }xVytd|	d\}W n tjk
r~   P Y nX || \}}}}||||f qNW q(| jtkr
| jtkr&| jd d d d }	xLt| jd d d D ]2}
x,t| j	|	t| jdD ]}||7 }qW qW n| jtkr| jd d d d }	xt| jd d d D ]*}
x"t| j	|	D ]}||7 }qvW q`W nx| jtkr| jd d d d }	xTt| jd d d D ]*}
x"t| j	|	D ]}||7 }qW qW ntd	| j ntd
| j ntd| j | t| d S )Nr   r   z<Br   r   r   )r   r/   zUnsupported alpha encoding %rzUnknown BLP encoding %rzUnknown BLP compression %r)ra   r   rX   rY   rS   rN   rO   BLP_ENCODING_UNCOMPRESSEDr   rB   rT   r   rM   r[   r   BLP_ENCODING_DXTrP   BLP_ALPHA_ENCODING_DXT1rG   r   r.   boolrF   BLP_ALPHA_ENCODING_DXT3r6   BLP_ALPHA_ENCODING_DXT5r9   r:   re   rf   )rI   rg   r   rh   ri   r-   r,   r+   r*   ZlinesizeZybdr   r   r   rZ   t  sL    

zBLP2Decoder._loadN)r;   r<   r=   rZ   r   r   r   r   rl   r  s   rl   c             C   s   | d d dkS )Nr   )s   BLP1s   BLP2r   )pr   r   r   <lambda>  s    ru   z.blpr?   r@   )F)rU   r   ior    r   r   rc   rm   rn   Z"BLP_ENCODING_UNCOMPRESSED_RAW_BGRAro   rq   rr   r   r.   r6   r9   NotImplementedErrorr:   r>   Z	PyDecoderrW   rb   rl   Zregister_openrV   Zregister_extensionZregister_decoderr   r   r   r   <module>   s0   
75H+*,;