Dark Bit Factory & Gravity

PROGRAMMING => Freebasic => Topic started by: rdc on November 17, 2006

Title: Bitmap Color Extractor Hack
Post by: rdc on November 17, 2006

Here is the little bitmap color extractor I used in my POM program. As I said it is a hack, but seems to work (at least with the bitmaps I tried) but I won't say it will work with all of them. May be slow on large bitmaps, as it uses the Point function. It asks for graphic screen settings; these should be the same as your target program, otherwise the colors may be off. Only tested with 32 bit color depth. Feel free to hack away on this, it is Public Domain.

Code: [Select]

'Convert.bas
'Richard Clark
'Extracts the color information from a bitmap
'to an include file for use in an FB program.
'Using a graphic screen and the Point function.
'Do not compile with -s gui, as this uses the console screen
'for input.
'Public doman, use any way you like.
option explicit

dim as integer iw, ih, sw, sh, dp
dim as string iname, aname, oname
dim as integer x, y, i, fh, cnt

Input "Enter bitmap width";iw
Input "Enter bitmap height";ih
Input "Enter bitmap filename (including extension)";iname
Input "Enter output array name";aname
Input "Enter export file name (including extension)";oname
Input "Enter graphic screen width";sw
Input "Enter graphic screen height";sh
Input "Enter graphic screen depth";dp

if iw <= 0 or ih <= 0 then
    print "Width and height must be greater than zero."
    sleep
    end
end if
if len(iname) = 0 or len(aname) = 0 or len(oname) = 0 then
    print "No values given for filename, array name or output file name."
    sleep
    end
end if
if sw <= 0 or sh <= 0 or dp <= 0 then
    print "Screen dimensions and depth must be greater than zero."
    sleep
    end
end if
if len(dir(iname)) = 0 then
    print "Cannot find " & iname &"."
    sleep
    end
end if

fh = freefile
if open(oname for output as #fh) <> 0 then
    print "Cannot open output file."
    sleep
    end
end if

dim bmvals(iw * ih) as uinteger
screenres sw, sh, dp
if Screenptr = 0 then
    print "Cannot set graphic screen."
    sleep
    close fh
    end
end if

bload iname

'Print out header information
print #fh, "Const " & trim(aname) & "w = " & str(iw)
print #fh, "Const " & trim(aname) & "h = " & str(ih)
print #fh, "Dim Shared " & trim(aname) & "(" & str(iw * ih) & ") As UInteger = { _"
 
for x = 0 to iw - 1
    for y = 0 to ih - 1
        bmvals(x + y * iw) = point(x, y)
    next
next

for i = lbound(bmvals) to ubound(bmvals)
    cnt += 1
    if i = ubound(bmvals) then
        print #fh, "&h" & hex(bmvals(i)) & "}"
    else
        if cnt < 8 then
            print #fh, "&h" & hex(bmvals(i)) & ",";
        else
            print #fh, "&h" & hex(bmvals(i)) & ", _"
            cnt = 0
        end if
    end if
next
close fh
end

Example useage:

Code: [Select]

option explicit

#include "sand.bi"

dim as uinteger x, y

screenres 640, 480, 32

for x = 0 to sandw - 1
    for y = 0 to sandh - 1
        pset(x, y), sand(x + y * sandw)
    next
next


sleep
end


Title: Re: Bitmap Color Extractor Hack
Post by: Shockwave on November 18, 2006

This could be useful as there are times when a bitmap>256 colours is needed :) Thanks Rick.

Title: Re: Bitmap Color Extractor Hack
Post by: rdc on November 18, 2006

Thanks, man. I don't really use anything less than 32bit, so I didn't try it, but a quick test indicates that it only appears to work with 32bit mode depths. The depth input isn't really needed, so you could remove that from the program.