Home > Community > Forums > Custom IC SKILL > How to create a BMP file using SKILL and Virtuoso ?

Email

* Required Fields

Recipients email * (separate multiple addresses with commas)

Your name *

Your email *

Message *

Contact Us

* Required Fields
First Name *

Last Name *

Email *

Company / Institution *

Comments: *

 How to create a BMP file using SKILL and Virtuoso ? 

Last post Mon, Jun 17 2013 1:50 PM by Andrew Beckett. 4 replies.
Started by BruceD 06 Sep 2012 10:37 AM. Topic has 4 replies and 1952 views
Page 1 of 1 (5 items)
Sort Posts:
  • Thu, Sep 6 2012 10:37 AM

    • BruceD
    • Not Ranked
    • Joined on Thu, Sep 6 2012
    • Posts 3
    • Points 45
    How to create a BMP file using SKILL and Virtuoso ? Reply

    Hello All

    This is my first topic here :) And i need your help for doing something a little bit tricky (to me!)

    I have a layout with let's say 2 layers. (to keep things simple.) overlapping a bunch of instances.

    Everytime layer1 or Layer2 is overlapping a part of the matrix , i calculate the percentage of covered area.

    I assume that if there is no overlap, my value is 255.

    If i have let's say 3%of coverage,  then my value will be(100%-3%)*255 = 247.

    Foreach instance in ly layout, i calculate the corresponding value of coverage. So my values can be from 0 to 255, if i have full coverage or not..

    I would like to create a BMP file (not XPM, not  XBM because i need the sequence RGB )  with those calculated values (0 to 255).

    But BMP is a binary format, so i need to convet the decimal values to ASCII chars and put that in a file.

    The command IntToChar works almost -- not for every decimal value (00 for example) and even if i can get a result with intToChar, i can not print it in a file using fprintf command :( 

    If someone can think about a smart way to create a BMP using Virtuoso (IPC ok, using another language) could you please help me with that? i'm unfortunately not "fluent" in perl or tcl. Any help is welcome!

    Thanks a lot guys for your help.

    Best,

    Bruce

     

    Filed under: , ,
    • Post Points: 20
  • Fri, Sep 7 2012 2:44 AM

    • marcelpreda
    • Top 150 Contributor
    • Joined on Tue, Jan 19 2010
    • Bucharest, Romania
    • Posts 44
    • Points 715
    Re: How to create a BMP file using SKILL and Virtuoso ? Reply

    Hi Bruce,

    I thing that a format like "%03d" used in [f]printf() function will solve your problem.

    E.g

    printf("%03d" 0)   -> 000

    printf("%03d" 12)  -> 012

     

    BR,

    Marcel

    • Post Points: 20
  • Fri, Sep 7 2012 3:37 AM

    Re: How to create a BMP file using SKILL and Virtuoso ? Reply

    Bruce,

    There is no direct support for writing binary files in Virtuoso. There's a side effect which appears to write a zero-byte into a file, but I have advised others against using this because it is definitely a side effect and wouldn't be guaranteed to keep working - intToChar is the closest though.

    My suggestion would be to write out a sequence of numbers (as hex) and then invoke an external program to convert to binary. For example this SKILL:

    hexfile=outfile("./hexfile")
    for(i 0 255
      fprintf(hexfile "%02x" i)
    )
    close(hexfile)

    and then this python program (I believe another AE has given you a Tcl way to do something similar):

    #!/usr/bin/env python
    # hexToBinary.py
    # convert a hex string to binary

    import sys
    import binascii

    # no error checking 'cos I'm lazy. Reads the
    # first file in ASCII hex, and writes out the second file
    # in binary
    hexfile = open(sys.argv[1],'r')
    binfile = open(sys.argv[2],'wb')
    hexdata=hexfile.read()
    bindata=binascii.a2b_hex(hexdata)
    binfile.write(bindata)
    binfile.close()
    hexfile.close()

    Then if I run:

    hexToBinary.py hexfile binfile
    hexdump -C binfile

    00000000  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
    00000010  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
    00000020  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
    00000030  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
    00000040  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
    00000050  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
    00000060  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
    00000070  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
    00000080  80 81 82 83 84 85 86 87  88 89 8a 8b 8c 8d 8e 8f  |................|
    00000090  90 91 92 93 94 95 96 97  98 99 9a 9b 9c 9d 9e 9f  |................|
    000000a0  a0 a1 a2 a3 a4 a5 a6 a7  a8 a9 aa ab ac ad ae af  |................|
    000000b0  b0 b1 b2 b3 b4 b5 b6 b7  b8 b9 ba bb bc bd be bf  |................|
    000000c0  c0 c1 c2 c3 c4 c5 c6 c7  c8 c9 ca cb cc cd ce cf  |................|
    000000d0  d0 d1 d2 d3 d4 d5 d6 d7  d8 d9 da db dc dd de df  |................|
    000000e0  e0 e1 e2 e3 e4 e5 e6 e7  e8 e9 ea eb ec ed ee ef  |................|
    000000f0  f0 f1 f2 f3 f4 f5 f6 f7  f8 f9 fa fb fc fd fe ff  |................|

    So you could write out each byte simply using %2x from SKILL, and then go through a simple converter to convert to binary. Pretty straightforward.

    Andrew.

     

    • Post Points: 20
  • Mon, Jun 17 2013 1:35 PM

    • serricat
    • Not Ranked
    • Joined on Mon, Jun 17 2013
    • Posts 1
    • Points 20
    Re: How to create a BMP file using SKILL and Virtuoso ? Reply

     HI Andrew,

     I am trying to do the same thing and I have been able to convert the hex file to binary format but I am unsure of how to generate the hex file so that it creates a bmp.  Do you have any idea of how to format the hex file for bmp format?

    Thanks,

    Heather

    • Post Points: 20
  • Mon, Jun 17 2013 1:50 PM

    Re: How to create a BMP file using SKILL and Virtuoso ? Reply

    Heather,

    I've not written anything to generate BMP files but the key would be understanding the format itself. A search in google reveals quite a few places with info including http://en.m.wikipedia.org/wiki/BMP_file_format

    Good luck!

    To be honest, if it was me, I'd use a language with a richer set of libraries for image generation (such as python) and then generate the info about the pixels in want from SKILL in some convenient form and use the image processing libraries under python to do the heavy lifting. That will make life considerably easier.  

    Regards,

    Andrew 

    • Post Points: 5
Page 1 of 1 (5 items)
Sort Posts:
Started by BruceD at 06 Sep 2012 10:37 AM. Topic has 4 replies.