Spliting a large hex image into multiple strings

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3 total messages Started by Desmond_Anderson Thu, 08 Jul 2004 15:58

#488

Author: Desmond_Anderson
Date: Thu, 08 Jul 2004 15:58

23 lines
1686 bytes

Hi,
  Currently I have my image routine calling a string of hex values for presentation. The problem is when the hex string is larger than the string limit. I would like to keep it that way but break it up into 1 to n strings and put each strings on the stack when needed bye the image routine. I know that I can put the data inline but it does not serve my purpose. Does anyone have an idea of how I can accomplish that?

example:
/_fileProc {
       gsave
       /RawData _dtachk /ASCIIHexDecode filter def
       /Data RawData << >> /DCTDecode filter def
        /DeviceRGB setcolorspace
         { << /ImageType 1 /Width 546 /Height 356 /ImageMatrix [ 546 0 0 -356 0 356 ] /DataSource Data /BitsPerComponent 8 /Decode [0 1 0 1 0 1] >> image
           Data closefile
           RawData flushfile
       } exec
      grestore
} def
/_dtachk {_dta _dta1 } def
/_dta {(hex string.... )} def
/_dta1 {(hex string ....>)} def
_fileProc showpage

If I call _dta alone, it works.

Desmond

Re: Spliting a large hex image into multiple strings

#489

Author: Helge_Blischke
Date: Thu, 08 Jul 2004 16:32

1 lines
860 bytes

You'd have to make up an array of hex strings and change your data source to be a procedure which consumes all strings in the array as needed.

Re: Spliting a large hex image into multiple strings

#490

Author: Desmond_Anderson
Date: Thu, 08 Jul 2004 18:00

21 lines
1499 bytes

Hi Blischke,
   Thanks for responding. I did some changes (example below) but it only process the first one. I am not great at this so could please explain to me how I can force it to call the procedure again.
example:
/_fileProc {
    % gsave
       /RawData _dtachk /ASCIIHexDecode filter def
       /Data RawData << >> /DCTDecode filter def
        /DeviceRGB setcolorspace
         { << /ImageType 1 /Width 546 /Height 356 /ImageMatrix [ 546 0 0 -356 0 356 ] /DataSource Data /BitsPerComponent 8 /Decode [0 1 0 1 0 1] >> image
           %Data closefile
           %RawData flushfile
         % pop
       } exec
     % grestore
} def
/idx 0 def
/_dtachk {_dta idx get /idx idx 1 add def} def
/_dta {[(hex string1.... )(hex string2.... >)]} def

Thanks again,
Desmond

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