Creating Icons from Bitmaps: Difference between revisions

From QB64 Phoenix Edition Wiki
Jump to navigation Jump to search
No edit summary
No edit summary
 
(4 intermediate revisions by the same user not shown)
Line 1: Line 1:
----
----
<center>'''{{Text|Attention!! - This page is outdated and provided for reference and/or education only.|red}}'''</center>
<center>([[Historic Pages|Return to historic Table of Contents]])</center>
----
<center>Starting with '''QB64-PE v3.14.0''' Icon files (ICO) can be handled using [[_LOADIMAGE]] and [[_SAVEIMAGE]].</center>
----
----<br>
The following program can create a single icon from square bitmaps up to 128 X 128. Best to use sizes 32 X 32 or 64 X 64.
The following program can create a single icon from square bitmaps up to 128 X 128. Best to use sizes 32 X 32 or 64 X 64.


Line 31: Line 40:
{{Cl|GET}} 1, 1 + dat + 4, wide 'skip header size in BMP
{{Cl|GET}} 1, 1 + dat + 4, wide 'skip header size in BMP
{{Cl|SELECT CASE}} wide
{{Cl|SELECT CASE}} wide
   {{Cl|CASE}} {{Cl|IS}} < {{Cl|&H}}100: Byte = wide '< 256
   {{Cl|CASE IS}} < {{Cl|&H}}100: Byte = wide '< 256
   {{Cl|CASE}} {{Cl|&H}}100: Byte = 0
   {{Cl|CASE}} {{Cl|&H}}100: Byte = 0
   {{Cl|CASE ELSE}}: {{Cl|PRINT}} "bitmap is larger than 256 pixels.": {{Cl|END}}
   {{Cl|CASE ELSE}}: {{Cl|PRINT}} "bitmap is larger than 256 pixels.": {{Cl|END}}
Line 38: Line 47:
{{Cl|GET}} 1, , high
{{Cl|GET}} 1, , high
{{Cl|SELECT CASE}} high
{{Cl|SELECT CASE}} high
   {{Cl|CASE}} {{Cl|IS}} < {{Cl|&H}}100: Byte = high '< 256
   {{Cl|CASE IS}} < {{Cl|&H}}100: Byte = high '< 256
   {{Cl|CASE}} {{Cl|&H}}100: Byte = 0 '256 = 0
   {{Cl|CASE}} {{Cl|&H}}100: Byte = 0 '256 = 0
   {{Cl|CASE ELSE}}: {{Cl|PRINT}} "bitmap is larger than 256 pixels.": {{Cl|END}}
   {{Cl|CASE ELSE}}: {{Cl|PRINT}} "bitmap is larger than 256 pixels.": {{Cl|END}}
Line 80: Line 89:
{{Cl|SYSTEM}}
{{Cl|SYSTEM}}
{{CodeEnd}}
{{CodeEnd}}
{{Small|Adapted from code by Michael Calkins, Public domain, November 2011}}
{{Small|Adapted from code by Michael Calkins}}




Line 90: Line 99:




{{PageNavigation}}
{{PageReferences}}

Latest revision as of 13:26, 19 November 2024

Attention!! - This page is outdated and provided for reference and/or education only.
(Return to historic Table of Contents)
Starting with QB64-PE v3.14.0 Icon files (ICO) can be handled using _LOADIMAGE and _SAVEIMAGE.


The following program can create a single icon from square bitmaps up to 128 X 128. Best to use sizes 32 X 32 or 64 X 64. 


CONST dat = 14~&
DIM Dword AS _UNSIGNED LONG
DIM size AS _UNSIGNED LONG
DIM wide AS _UNSIGNED LONG
DIM high AS _UNSIGNED LONG
DIM Word AS _UNSIGNED INTEGER
DIM Byte AS _UNSIGNED _BYTE
DO
  LINE INPUT "Enter existing BMP file name to convert to icon: ", BMP$
LOOP UNTIL _FILEEXISTS(BMP$)
DO
  LINE INPUT "Enter ICO file name to create (must not exist): ", ICO$
LOOP UNTIL _FILEEXISTS(ICO$) = 0

OPEN BMP$ FOR BINARY ACCESS READ AS 1 'BITMAP name
OPEN ICO$ FOR OUTPUT AS 2 'destination icon name
CLOSE 2
OPEN ICO$ FOR BINARY AS 2
GET 1, 1 + 2, size 'skip "BM" in bitmap
size = size - 14 '14 bytes not used

Word = 0
PUT 2, 1, Word 'reserved
Word = 1
PUT 2, , Word 'resource id 1 as icon, 2 as cursor
PUT 2, , Word 'icon count in resource
GET 1, 1 + dat + 4, wide 'skip header size in BMP
SELECT CASE wide
  CASE IS < &H100: Byte = wide '< 256
  CASE &H100: Byte = 0
  CASE ELSE: PRINT "bitmap is larger than 256 pixels.": END
END SELECT
PUT 2, , Byte 'width
GET 1, , high
SELECT CASE high
  CASE IS < &H100: Byte = high '< 256
  CASE &H100: Byte = 0 '256 = 0
  CASE ELSE: PRINT "bitmap is larger than 256 pixels.": END
END SELECT
PUT 2, , Byte 'height
Byte = 0
GET 1, 1 + dat + 14, Word 'number of colors from BPP
IF Word < 8 THEN Byte = 2 ^ Word ELSE Byte = 0 '256 colors = 0, 4BPP = 16
PUT 2, , Byte 'num of colors
Byte = 0
Dword = 0
PUT 2, , Byte 'reserved as byte
PUT 2, , Dword 'reserved 2 hotspots = 0
Dword = size + (((wide * high) + 7) \ 8)
PUT 2, , Dword 'size of data
Dword = 22 '6 byte header + 16
PUT 2, , Dword 'offset

'copy bitmap header down 14 bytes, palette and image info, but double height
SEEK 1, 1 + dat 'BMP info header size
FOR Dword = 1 TO size 'actual BMP data from Header size on
  GET 1, , Byte
  IF Dword = 1 + 8 THEN
    Word = high * 2 ' 2 times height
    PUT 2, , Word
    Dword = Dword + 1
    GET 1, , Byte
  ELSE
    PUT 2, , Byte
  END IF
NEXT

'add null AND bitmask for full square image
Byte = 0
BitsOver& = wide MOD 32  'pad the AND mask for minimum of 4 byte width
IF BitsOver& THEN ANDpad& = (32 - BitsOver&) ELSE ANDpad& = 0
FOR Dword = 1 TO high * (wide + ANDpad&) \ 8
  PUT 2, , Byte
NEXT
CLOSE
SYSTEM
Adapted from code by Michael Calkins


See also


QB64 Programming References

Wiki Pages
Main Page with Articles and Tutorials
QB64 specific keywords (alphabetical)
Original QBasic keywords (alphabetical)
QB64 OpenGL keywords (alphabetical)
Keywords by Usage
Got a question about something?
Frequently Asked Questions about QB64
QB64 Phoenix Edition Community Forum
Links to other QBasic Sites:
Pete's QBasic Forum
Pete's QBasic Downloads
Retrieved from "https://qb64phoenix.com/qb64wiki/index.php?title=Creating_Icons_from_Bitmaps&oldid=9252"