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fortran66のブログ

fortran について書きます。

BMP to AA プログラム 再

以前 BMP 画像を ASCII ART に直すプログラムを作りましたが、それを改良します。
fortran66.hatenablog.com

  • 改良点1

以前は横幅が4の倍数である必要がありましたが、任意幅に対応しました。

  • 改良点2

白ベタ、黒ベタになる部分を輝度に比例した出力になるようにしました。

入力データ

BMP に直す必要があります。
f:id:fortran66:20160526011539j:plain

出力例

例1

入力画像
f:id:fortran66:20160526011649j:plain
出力画像
f:id:fortran66:20160526011500p:plain

例2

入出力画像
f:id:fortran66:20160526012518j:plainf:id:fortran66:20160526012454p:plain

プログラム

手抜きで直しましたw
白べたは M 黒ベタは空白になるので、それが出たマスを luminosity に応じて別の文字に置き換えます。つまり、輪郭部分はドットの形状に合わせた文字となり、内部のべた部分は luminosity に依存した明暗が付きます。

    module m_bmp
      implicit none
      type :: t_bmp_file_header
        sequence  
        character(2) :: bfType = 'BM' ! BitMap
        integer(4)   :: bfSize          ! file size in bytes
        integer(2)   :: bfReserved1 = 0 ! always 0
        integer(2)   :: bfReserved2 = 0 ! always 0
        integer(4)   :: bfOffBits
      end type t_bmp_file_header
      
      type :: t_bmp_info_header
        sequence
        integer(4) :: biSize    = Z'28' ! size of bmp_info_header ; 40bytes 
        integer(4) :: biWidth
        integer(4) :: biHeight
        integer(2) :: biPlanes  = 1 ! always 1
        integer(2) :: biBitCount
        integer(4) :: biCompression   = 0 ! 0:nocompression, 1:8bitRLE, 2:4bitRLE, 3:bitfield
        integer(4) :: biSizeImage
        integer(4) :: biXPelsPerMeter = 3780 ! 96dpi
        integer(4) :: biYPelsPerMeter = 3780 ! 96dpi 
        integer(4) :: biClrUsed       = 0
        integer(4) :: biClrImportant  = 0 
      end type t_bmp_info_header
      
      type :: t_rgb
        sequence
        character :: r, g, b
      end type t_rgb 
      
      type :: t_bmp
        type(t_rgb), allocatable :: rgb(:, :)
      contains 
        procedure :: rd => rd_bmp
      end type  
    contains   
      subroutine rd_bmp(bmp, fn)
        class(t_bmp), intent(out) :: bmp
        character(len = *), intent(in) :: fn
        type(t_bmp_file_header) :: bmp_file_header
        type(t_bmp_info_header) :: bmp_info_header
        integer :: i, j
        character :: dummy
        open(9, file = fn//'.bmp', access = 'stream', status = 'unknown')
        read(9) bmp_file_header, bmp_info_header
        allocate( bmp%rgb(bmp_info_header%biWidth, bmp_info_header%biHeight) )
        read(9) (bmp%rgb(:, i), (dummy, j = 1, mod(bmp_info_header%biWidth, 4)), i = 1, bmp_info_header%biHeight)
        close(9)
      end subroutine rd_bmp  
    end module m_bmp
    
    module m_font
      use m_bmp 
      implicit none
      integer, parameter :: mx = 4, my = 8
      character(len = *), parameter :: font_name = 'font4x8' 
      
      type :: t_bmp_array
        type(t_bmp), allocatable :: bmp(:, :)  
      end type t_bmp_array 
    contains
      subroutine rd_font(font)
        type(t_bmp_array), intent(out) :: font
        call rd_and_chop(font, font_name)
      end subroutine rd_font
    
      subroutine rd_and_chop(pic, fn)
        type(t_bmp_array), intent(out) :: pic
        character(len = *), intent(in) :: fn
        type(t_bmp) :: bmp 
        integer :: ix, iy, kx, ky  
        call bmp%rd(fn)
        associate(nx => size(bmp%rgb, 1) / mx, ny => size(bmp%rgb, 2) / my)
          allocate(pic%bmp(nx, ny))
          do ix = 1, nx
            do iy = 1, ny
              kx = (ix - 1) * mx + 1 
              ky = (iy - 1) * my + 1    
              pic%bmp(ix, iy)%rgb = bmp%rgb(kx:kx + mx - 1, ky:ky + my - 1)
            end do
          end do  
        end associate  
      end subroutine rd_and_chop

      pure elemental character function to_aa(ft, font)
        type(t_bmp      ), intent(in) :: ft                
        type(t_bmp_array), intent(in) :: font
        to_aa = char_font( minloc( distance(ft, font%bmp) ) ) ! find min. from font-array
      contains
        pure elemental integer function distance(ft1, ft0) 
          type(t_bmp), intent(in) :: ft1, ft0
          real, parameter :: f = 1.5 ! f empirical parameter  0.5~2.0
          distance = sum( (  iachar(ft1%rgb%r) + iachar(ft1%rgb%g) + iachar(ft1%rgb%b)  &
                      - f * (iachar(ft0%rgb%r) + iachar(ft0%rgb%g) + iachar(ft0%rgb%b)) )**2 )
        end function distance   
        
        pure character function char_font(ipos)
          integer, intent(in) :: ipos(2)
          associate(nx => size(font%bmp, 1), ny => size(font%bmp, 2))
            char_font = achar( ipos(1) + (ny - ipos(2)) * nx - 1 + x'20' )  
          end associate  
        end function char_font
      end function to_aa
    
      pure elemental character function adjust(ft, chars)
        type(t_bmp), intent(in) :: ft                
        character (len = *), intent(in) :: chars 
        integer :: k
        k = luminosity(ft) * len(chars) / 256 / size(ft%rgb) + 1
        adjust = chars(k:k) 
      contains
        pure elemental integer function luminosity(ft) 
          type(t_bmp), intent(in) :: ft
          real, parameter :: fr = 0.3, fg = 0.6, fb = 0.1 ! luminosity factor
          luminosity = sum( fr * iachar(ft%rgb%r) + fg * iachar(ft%rgb%g) + fb * iachar(ft%rgb%b) )
        end function luminosity
      end function adjust
    end module m_font
    
    program BMP_to_AA
      use m_font
      implicit none
      character, allocatable :: aa(:, :)
! make ASCII ART      
      block 
        type(t_bmp_array) :: font, pic 
        call rd_font(font) 
        call rd_and_chop(pic, 'tktt')
        aa = to_aa(pic%bmp, font)
        where (aa == 'M') aa = adjust(pic%bmp, '***===&$#M') ! white gradation
        where (aa == ' ') aa = adjust(pic%bmp, '   .,`''"-:;'  ) ! black gradation
      end block  
! output to console
      block 
        integer :: iy  
        do iy = size(aa, 2), 1, -1       
          print '(*(g0))', aa(:, iy)
        end do
      end block  
    end program BMP_to_AA

おまけ

出力2の文字データ

MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#####MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM$F~~.   ..~W~~~"W$#MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMW~            .      .~W#MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMMM#~              ..         .~$MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMMF                 .           .~$MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMW'                              ...~#MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMW'                             ......,$MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMW                                ......,$MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMW'                                .......,##MMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMM@'                                .........(####MMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMM#'               ...    .   . .   ..........,######MMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMF               .....       .   .  ..........&#######MMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMM@               ....                   .......~########MMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMF              ..,..                   ... ...,#########MMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMW               ...                       ......$#########MMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMM#]            ,>F"'',z,      ,             .. ...(#########MMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMM#'          .`___]_  g"=ggg&&&g______      ......($#########MMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMM#W          .q&&&&&&&&&g&&&$##$&W~~~~~"a,   .. ...`$##########MMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMM##F          ,&$$$$$$$$$$$$$####$&&mg_&,.,     ....,$##########MMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMM##'          (&$$#######$$$$#M###$$&&&&&&r     .....&###########MMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMM##$'          (&$$$####$$&&$#############$=    . ....(###########MMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMM##@.          ,&&$$$$$$&&$&$#M##$$#######$W     . ...`$##########MMMMMMMMMMMMMMMM
MMMMMMMMMMMMMM###F.          .=&&$$&&$&&~~&&$$$$$$#####$&'    ..... ,$###########MMMMMMMMMMMMMMM
MMMMMMMMMMMMMM###L.          .(&&&F&&$$$$$&&&&$#$&$$$$$&F        .. .($############MMMMMMMM###MM
MMMMMMMMMMMMMM##$N'           `&&&g,~~~WW$$#####$&&$$&&~       . .. .~$##################$E=&$##
MMMMMMMMMMMMM###$(.           ,=&&&&g===$&&&g_~$g&&&&='        .... .,&$#################&&$g&$$
MMMMMMMMMMMM####$&            .`=&&&&&&&&&&&&$$$$&&&~'    .    ....  ,($$################$&##&@W
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MMMMMMMM########$@            .  ....,~~~~~~,,,._..              ..   ,`&$$$$###########$$$$$&&$
MMMMMMMM########$F             ...,,,,,,````__&$$&,.           .  .   .`&####MMMM#########$$$$$&
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MMMMMM##MMMM###'         .$$$$$#MMMMMMMMMMMMMMMM#$$$=.'                j.,#MMMMMMMMMMMMMMMMMMMM#
MMMMMMM##MMM##F         .j&$$###MMMMMMMMMMMMMMM##$$&&).               .=.,#MMMMMMMMMMMMMMMMMMMMM
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####MMM##MMM#F         ,,&$$#MMMMMMMMMMMMMMMMM#MM#$$&'                d&&@$MMMMMMMMMMMMMMMMMMMMM
#####MM#MMM#$         ._U$##MM#MMMMMMMMMMMMMMMMM##$$$                .$$#$$MMMMMMMMMMMMMMMMMMMMM
#####MM#MMM#F         _&D$MMMMMMMMMMMMMMMMMMMMMM###&'                ,##M#$MMMMMMMMMMMMMMMMMMMMM
######MMMM#@         ,&&$#MMMMMMMMMMMMMMMMMMMMMMM#$&'                d#MM##MMMMMM##MMMMMMMMMMMMM
######MMM##F        .,$$#MMMMMMMMMMMMMMMMMMMMMMMM#$r                .$MMMMMMMMMMMM#MMMMMMMMMMMMM
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########$$$#######MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#&_q&{.__,gg#MMMMMMMMMMMMMMMMMMMM#&&&&&$$#MMM#M
########$$$$###MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#$##g$$$#MMMMMMMMMMMMMMMMMMMMMMMM$$$$$&&$$#MMM
########$$$&$###MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM$$$$$$$$$$$#M
#########$$$&$###MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#$$$$$$$$$$$$$
#########$$$&&####MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM$$$$$$$$####$
#########$$$&&&#####MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#############
##########$$$&=&#####MMMMMMMMMMMMMMMMMMMMMMM#MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#############
##########$$$&&=&$##M#MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#############
##########$$$&&&&&##M###MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#############
###########$$$&&&N######MM##MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM#############
###########$$&&&&&#######MMMM#MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM##########MMMM
###########$$$&&&&$#######MMM#MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM########MMMMM
##############$gggg#####MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
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