SaveIcon32

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The following Icon creation procedure was adapted from Galleon's SAVEIMAGE sup-procedure that creates 8 BPP or 32 bit bitmaps:


NOTE: QB64 cannot use Icon Images or Icons as the _ICON in the TITLE bar!

DO LINE INPUT "Use 8 bit(256 colors) or 32 bit image? ", bit$ clrmode% = VAL(bit$) LOOP UNTIL clrmode% = 8 OR clrmode% = 32 IF clrmode% = 8 THEN clrmode% = 256 LOCATE 10, 10: PRINT "Do you wish to make black transparent? (Y/N) "; K$ = INPUT$(1): PRINT K$ IF UCASE$(K$) = "Y" THEN mode% = 1 _DELAY 1 SCREEN _NEWIMAGE(640, 480, clrmode%) DO LOCATE 10, 10: LINE INPUT "Enter the icon size to use(multiple of 16): ", sz$ size& = VAL(sz$) LOOP UNTIL size& MOD 16 = 0 AND size& >= 16 AND size& <= 128 DO LOCATE 10, 10: LINE INPUT "Enter the image file name to convert to an icon: ", BMP$ CLS LOOP UNTIL _FILEEXISTS(BMP$) img& = _LOADIMAGE(BMP$) IF img& = -1 OR img& = 0 THEN LOCATE 15, 25: PRINT "Image failed to load!": END IF mode% = 0 THEN CLS , _RGB(255, 255, 255) IF clrmode% = 256 THEN _COPYPALETTE (img&) _PUTIMAGE (0, 0)-(size& - 1, size& - 1), img&, 0 '(31, 31), img&, 0 '<<<<<<<<<<< LOCATE 20, 10: PRINT "Do you want to make an icon out of the image? (Y/N) "; K$ = INPUT$(1): PRINT K$ IF UCASE$(K$) <> "Y" THEN END SaveFile$ = LEFT$(BMP$, INSTR(BMP$, ".")) + "ico" SaveIcon32 img&, size&, mode%, SaveFile$ END ' --------------------------------------------------------- SUB SaveIcon32 (image AS LONG, size AS LONG, mode AS INTEGER, filename AS STRING) bytesperpixel& = _PIXELSIZE(image&) IF bytesperpixel& = 0 THEN PRINT "Text modes unsupported!": END IF bytesperpixel& = 1 THEN bpp& = 8 ELSE bpp& = 24 '256 or 32 bit color IF size& MOD 16 OR size& < 16 OR size& > 128 THEN PRINT "Size not supported!": END x& = size& 'supports sizes from 16 to 128 only! y& = size& 'Headers: icon count width depth colors cursor hotspots size - offset b$= MKI$(0)+MKI$(1)+MKI$(1)+CHR$(x&)+CHR$(y&)+CHR$(0)+CHR$(0)+MKI$(0)+MKI$(0)+"????"+MKL$(22) _ +MKL$(40)+MKL$(x&)+MKL$(2 * y&)+MKI$(1)+MKI$(bpp&)+MKL$(0)+"????" + STRING$(16, 0) 'BMP size width double height plane BPP raw size IF bytesperpixel& = 1 THEN FOR c& = 0 TO 255 ' read BGR color settings from image + 1 byte spacer(CHR$(0)) cv& = _PALETTECOLOR(c&, image&) ' color attribute to read. b$ = b$ + CHR$(_BLUE32(cv&)) + CHR$(_GREEN32(cv&)) + CHR$(_RED32(cv&)) + CHR$(0) 'spacer NEXT END IF lastsource& = _SOURCE _SOURCE 0 'set source as program screen. Do NOT use loaded image handle as size has changed! IF ((x& * 3) MOD 4) THEN padder$ = STRING$(4 - ((x& * 3) MOD 4), 0) FOR py& = y& - 1 TO 0 STEP -1 ' read target image pixel color data r$ = "" FOR px& = 0 TO x& - 1 c& = POINT(px&, py&) IF bytesperpixel& = 1 THEN r$ = r$ + CHR$(c&) ELSE r$ = r$ + LEFT$(MKL$(c&), 3) NEXT px& d$ = d$ + r$ + padder$ NEXT py& IF (x& MOD 32) THEN bitpad& = 32 - (x& MOD 32) 'padder bits when not multiples of 32 IF mode% THEN 'make black pixels white in AND mask so they become transparent FOR py& = y& - 1 TO 0 STEP -1 'read image to find black pixels px& = 0 DO: byte% = 0 FOR bit% = 7 TO 0 STEP -1 'change transparent color to suit your needs byte% = 2 * byte% - (POINT(px&, py&) = _RGB(0, 0, 0)) 'bitpacking adds 1 when true px& = px& + 1 NEXT a$ = a$ + CHR$(byte%) LOOP WHILE px& < x& - 1 IF bitpad& THEN a$ = a$ + STRING$((bitpad& + 7) \ 8, 0) 'add padder at end of row when necessary NEXT ELSE a$ = STRING$(y& * ((x& + bitpad& + 7) \ 8), 0) 'totally black AND mask END IF d$ = d$ + a$ _SOURCE lastsource& MID$(b$, 43, 4) = MKL$(LEN(d$)) 'raw image size with AND mask b$ = b$ + d$ ' total file data bytes to create file MID$(b$, 15, 4) = MKL$(LEN(b$) - 22) ' size of data file minus Entry header offset IF LCASE$(RIGHT$(filename$, 4)) <> ".ico" THEN ext$ = ".ico" f& = FREEFILE OPEN filename$ + ext$ FOR OUTPUT AS #f&: CLOSE #f& ' erases an existing file OPEN filename$ + ext$ FOR BINARY AS #f& PUT #f&, , b$ CLOSE #f& END SUB

Code by Ted Weissgerber
Explanation: The icons created can have a full black AND mask for a solid square image when mode% is zero. If mode% is a value other than 0, the AND mask routine looks for black pixels and sets the background pixel on for transparency. Icons with dimensions that are not a multiple of 32 would require padding. In the header, ???? is later replaced with size data. If the image is 24/32 BPP, the size of the XOR image data will triple because each pixel uses 3 bytes for red, green and blue values up to 255.
To create .CUR cursor files change the second value from 1 to 2 and set the 2 cursor click hotspot offset INTEGER values.
Note: Icon sizes that are not multiples of 32 require AND mask width padding to multiples of 4 bytes!

IF Width MOD 32 THEN ANDpad% = 32 - (Width MOD 32) 'bits, divide by 8 to get bytes

Icons that are 16 X 16 or 48 X 48 require 2 padder bytes to be added at the end of each row increasing data size by 32 and 96.


See also:



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