Program ScreenShots

Creating Screenshot Bitmaps inside of your Programs

Syntax: EightBit Minimum_Column%, Minimum_Row%, Maximum_Column%, Maximum_Row%, NewFileName$

The values of x1%, y%1, x2% and y2% can be any ON SCREEN area coordinates in the screen mode used.
You MUST subtract one when using the QB64 FULL SCREEN _WIDTH and _HEIGHT values! Otherwise POINT will return an Illegal function error! The maximum is one pixel less than the SCREEN resolution or the screen dimensions.
Both SUBs can be used in QB64 or Qbasic! The FourBit SUB takes about 8 seconds in QB.
FourBit SUB creates 4 BPP(16 color) and EightBit SUB creates 8 BPP(256 color) bitmaps.

QB64 Custom Screens

See the ThirtyTwoBit SUB routine to create QB64 screenshots of _NEWIMAGE screen pages or copy images loaded using _LOADIMAGE. Creates 256 or 24/32 bit color bitmaps using the QB64 image and page handles.

'----------------- Freeware by Bob Seguin 2003 -- (TheBOB) --------------------------| '| | '| ---- Decreased POINT time of 4 bit fullscreen to 8 seconds in Qbasic ---- | '| by Ted Weissgerber July, 2008 | '| - Add a special keypress to a game program to create a Screenshot - | '| | '--------------------------------- DEMO CODE ----------------------------------------- DO: CLS INPUT "ENTER Screen Mode 12 or 13 (0 quits): ", scrn% IF scrn% = 13 THEN SCREEN 13 '8 bit (256 colors) only LINE (0, 0)-(319, 199), 13, BF CIRCLE (160, 100), 50, 11 PAINT STEP(0, 0), 9, 11 Start! = TIMER EightBIT 0, 0, 319, 199, "Purple8" ELSEIF scrn% = 12 THEN SCREEN 12 '4 bit(16 colors) only LINE (0, 0)-(639, 479), 13, BF LINE (100, 100)-(500, 400), 12, BF CIRCLE (320, 240), 100, 11 PAINT STEP(0, 0), 9, 11 Start! = TIMER FourBIT 0, 0, 639, 479, "Purple4" '469, 239 ELSE : SYSTEM END IF Finish! = TIMER 'elapsed times valid for QB only PRINT "Elapsed time ="; Finish! - Start!; "secs."; "Press Escape to quit!" DO: K$ = INKEY$: LOOP UNTIL K$ <> "" LOOP UNTIL K$ = CHR$(27) SYSTEM '**************** End DEMO code ***********************

SUB EightBit (x1%, y1%, x2%, y2%, Filename$) 'SCREEN 13(256 color) bitmap maker 'NOTE: Adjust x2% = 319 and y2% = 199 for legal POINTs when fullscreen in SCREEN 13 DIM FileCOLORS%(1 TO 768) DIM Colors8%(255) IF x1% > x2% THEN SWAP x1%, x2% IF y1% > y2% THEN SWAP y1%, y2% IF INSTR(Filename$, ".BMP") = 0 THEN Filename$ = RTRIM$(LEFT$(Filename$, 8)) + ".BMP" END IF FileTYPE$ = "BM" Reserved1% = 0 Reserved2% = 0 OffsetBITS& = 1078 InfoHEADER& = 40 PictureWIDTH& = (x2% - x1%) + 1 PictureDEPTH& = (y2% - y1%) + 1 NumPLANES% = 1 BPP% = 8 Compression& = 0 WidthPELS& = 3780 DepthPELS& = 3780 NumCOLORS& = 256 IF (PictureWIDTH& AND 3) THEN ZeroPAD$ = SPACE$(4 - (x& AND 3)) ImageSIZE& = (PictureWIDTH& + LEN(ZeroPAD$)) * PictureDEPTH& FileSize& = ImageSIZE& + OffsetBITS& OUT &H3C7, 0 FOR n = 1 TO 768 STEP 3 FileCOLORS%(n) = INP(&H3C9) FileCOLORS%(n + 1) = INP(&H3C9) FileCOLORS%(n + 2) = INP(&H3C9) NEXT n f% = FREEFILE OPEN Filename$ FOR BINARY AS #f% PUT #f%, , FileTYPE$ PUT #f%, , FileSize& PUT #f%, , Reserved1% 'should be zero PUT #f%, , Reserved2% 'should be zero PUT #f%, , OffsetBITS& PUT #f%, , InfoHEADER& PUT #f%, , PictureWIDTH& PUT #f%, , PictureDEPTH& PUT #f%, , NumPLANES% PUT #f%, , BPP% PUT #f%, , Compression& PUT #f%, , ImageSIZE& PUT #f%, , WidthPELS& PUT #f%, , DepthPELS& PUT #f%, , NumCOLORS& PUT #f%, , SigCOLORS& '51 to 54 u$ = " " FOR n% = 1 TO 768 STEP 3 'PUT as BGR order colors Colr$ = CHR$(FileCOLORS%(n% + 2) * 4) PUT #f%, , Colr$ Colr$ = CHR$(FileCOLORS%(n% + 1) * 4) PUT #f%, , Colr$ Colr$ = CHR$(FileCOLORS%(n%) * 4) PUT #f%, , Colr$ PUT #f%, , u$ 'Unused byte NEXT n% FOR y = y2% TO y1% STEP -1 'place bottom up FOR x = x1% TO x2% a$ = CHR$(POINT(x, y)) Colors8%(ASC(a$)) = 1 PUT #f%, , a$ NEXT x PUT #f%, , ZeroPAD$ NEXT y FOR n = 0 TO 255 IF Colors8%(n) = 1 THEN SigCOLORS& = SigCOLORS& + 1 NEXT n PUT #f%, 51, SigCOLORS& CLOSE #f% END SUB

SUB FourBit (x1%, y1%, x2%, y2%, Filename$) ' SCREEN 12(16 color) bitmap maker 'fullscreen takes about 8 seconds in QB 'NOTE: Adjust x2% = 639 and y2% = 479 for legal POINTs when fullscreen in SCREEN 12 DIM FileCOLORS%(1 TO 48) DIM Colors4%(0 TO 15) IF x1% > x2% THEN SWAP x1%, x2% IF y1% > y2% THEN SWAP y1%, y2% IF INSTR(Filename$, ".BMP") = 0 THEN Filename$ = RTRIM$(LEFT$(Filename$, 8)) + ".BMP" END IF FileTYPE$ = "BM" Reserved1% = 0 Reserved2% = 0 OffsetBITS& = 118 InfoHEADER& = 40 PictureWIDTH& = (x2% - x1%) + 1 PictureDEPTH& = (y2% - y1%) + 1 NumPLANES% = 1 BPP% = 4 Compression& = 0 WidthPELS& = 3780 DepthPELS& = 3780 NumCOLORS& = 16 IF PictureWIDTH& MOD 8 <> 0 THEN ZeroPAD$ = SPACE$((8 - PictureWIDTH& MOD 8) \ 2) END IF ImageSIZE& = (((PictureWIDTH& + LEN(ZeroPAD$)) * PictureDEPTH&) + .1) / 2 FileSize& = ImageSIZE& + OffsetBITS& OUT &H3C7, 0 'start at color 0 FOR n = 1 TO 48 STEP 3 FileCOLORS%(n) = INP(&H3C9) FileCOLORS%(n + 1) = INP(&H3C9) FileCOLORS%(n + 2) = INP(&H3C9) NEXT n f% = FREEFILE OPEN Filename$ FOR BINARY AS #f% 'Header bytes PUT #f%, , FileTYPE$ '2 '1 to 2 PUT #f%, , FileSize& '4 PUT #f%, , Reserved1% 'should be zero '2 PUT #f%, , Reserved2% 'should be zero '2 PUT #f%, , OffsetBITS& '4 PUT #f%, , InfoHEADER& '4 PUT #f%, , PictureWIDTH& '4 PUT #f%, , PictureDEPTH& '4 PUT #f%, , NumPLANES% '2 PUT #f%, , BPP% '2 PUT #f%, , Compression& '4 PUT #f%, , ImageSIZE& '4 PUT #f%, , WidthPELS& '4 PUT #f%, , DepthPELS& '4 PUT #f%, , NumCOLORS& '4 PUT #f%, , SigCOLORS& '4 '51 - 54 u$ = " " 'unused byte FOR n% = 1 TO 46 STEP 3 'PUT as BGR order colors Colr$ = CHR$(FileCOLORS%(n% + 2) * 4) PUT #f%, , Colr$ Colr$ = CHR$(FileCOLORS%(n% + 1) * 4) PUT #f%, , Colr$ Colr$ = CHR$(FileCOLORS%(n%) * 4) PUT #f%, , Colr$ PUT #f, , u$ 'add Unused byte NEXT n% FOR y = y2% TO y1% STEP -1 'Place from bottom up FOR x = x1% TO x2% STEP 2 'nibble steps HiX = POINT(x, y): Colors4%(HiX) = 1 'added here LoX = POINT(x + 1, y): Colors4%(LoX) = 1 HiNIBBLE$ = HEX$(HiX) LoNIBBLE$ = HEX$(LoX) HexVAL$ = "&H" + HiNIBBLE$ + LoNIBBLE$ a$ = CHR$(VAL(HexVAL$)) PUT #f%, , a$ NEXT x PUT #f%, , ZeroPAD$ NEXT y FOR n = 0 TO 15 IF Colors4%(n) = 1 THEN SigCOLORS& = SigCOLORS& + 1 NEXT n PUT #f%, 51, SigCOLORS& CLOSE #f% 'BEEP 'optional sound not needed in QB64 as speed is fast END SUB