Memory getting weird using DrawBitMap
T Chap
Posts: 4,260
I grabbed a few parts from a large code. Can someone explain how the DrawBitMap line is overwriting a byte in VAR called ScreenMode to 0?
Thanks
Thanks
VAR
' plenty of longs, words, bytes here
Byte pwtimeout,fppause, plusminusval, test1, menumode, screenerase, ScreenMode, menuindex
Byte previouslockstate , currentlockstate, chksum
PUB somemethod
DrawBitmap(@graphic0_data, @graphics70_info) ' or other similar info
PRI DrawBitmap(pBitmap, pInfo)|c,i,j,BmpAddress,xPos, yPos, xSize, ySize,bpp,clr
bpp:=byte[pInfo++] '<<<<<<<<<<<< THIS IS WRITING SCREENMODE IN VAR TO 0 >>>>>>>>>>>>>>>>>
xSize:=byte[pInfo++]
ySize:=byte[pInfo++]
xPos:=byte[pInfo++]
yPos:=byte[pInfo++]
clr:=byte[pInfo++]
row:=yPos
col:=xPos
c:=0
BmpAddress:=pBitmap
repeat j from 0 to (ySize-1) step 2 '2
repeat i from 0 to (xSize-1)
screen[row * cols + col] := (clr<<1+1) << 10 + BmpAddress>>6 +c
screen[(row+1) * cols + col] := (clr<<1) << 10 + BmpAddress>>6 +c
c++
col++
row+=2
col:=xPos
DAT
UserCharEnd long '*******************************************************************
'bitmap size and location data
' bpp, width, height, x, y, clr
graphics1_info byte 1, 2, 4, 5, 13, 0 '1
graphics2_info byte 1, 2, 4, 5, 8, 0 '2
graphics3_info byte 1, 2, 4, 5, 3, 0 '2
graphics4_info byte 1, 2, 4, 10, 13, 0 '2
graphics5_info byte 1, 2, 4, 10, 8, 0 '2
graphics6_info byte 1, 2, 4, 10, 3, 0 '2
graphics7_info byte 1, 2, 4, 15, 13, 0 '2
graphics8_info byte 1, 2, 4, 15, 8, 0 '2
graphics9_info byte 1, 2, 4, 15, 3, 0 '2
graphics0_info byte 1, 2, 4, 20, 8, 0 '2
Comments
If so, I don't immediately see how that is possible, unless you are out of memory and the stack is corrupted or something...
DrawBitmap(@graphic0_data, @graphics60_info)
and the ScreenMode stays equal to 1 like it should.
But, if you use any of these it changes ScreenMode to 0:
DrawBitmap(@graphic0_data, @graphics61_info)
DrawBitmap(@graphic0_data, @graphics62_info)
DrawBitmap(@graphic0_data, @graphics63_info)
DrawBitmap(@graphic0_data, @graphics64_info)
DrawBitmap(@graphic0_data, @graphics65_info)
DrawBitmap(@graphic0_data, @graphics66_info)
DrawBitmap(@graphic0_data, @graphics67_info)
DrawBitmap(@graphic0_data, @graphics68_info)
DrawBitmap(@graphic0_data, @graphics69_info)
DrawBitmap(@graphic0_data, @graphics70_info)
Remove the line bpp:=byte[pInfo++] and ScreenMode is not affected.
Remove both the line bpp:=byte[pInfo++] AND xSize:=byte[pInfo++] and ScreenMode changes to some other number besides 0 or 1 which it is supposedly only allowed to be set to. Somehow the var is getting overwritten on in some cases of using @graphics70_info, but not others.
DAT padding LONG 7[16] UserCharStart long' ********************************************************* graphic1_data long file "1.dat" graphic2_data long file "2.dat" graphic3_data long file "3.dat" graphic4_data long file "4.dat" graphic5_data long file "5.dat" graphic6_data long file "6.dat" graphic7_data long file "7.dat" graphic8_data long file "8.dat" graphic9_data long file "9.dat" graphic0_data long file "0.dat" graphic15_data long file "plus.dat" graphic16_data long file "minus.dat" graphic20_data long file "dadologomask.dat" 'dado graphic21_data long file "dadologo1.dat" 'dado '''[[[[[[[ Group 1 ]]]]]]]]] { graphic39_data long file "enteradmin.dat" graphic40_data long file "menuoptions.dat" graphic41_data long file "togglescreen.dat" graphic42_data long file "changeadmin.dat" graphic43_data long file "changeuser.dat" graphic44_data long file "enterprint.dat" graphic45_data long file "deleteprint.dat" } '''[[[[[[[ Group 2 ]]]]]]]]] { graphic46_data long file "deleteallprints.dat" graphic47_data long file "setbeepvol.dat" graphic50_data long file "exitmenu.dat" graphic52_data long file "exitingmenu.dat" graphic53_data long file "accepted.dat" graphic54_data long file "enternewpw.dat" graphic56_data long file "acceptchange.dat" } '''[[[[[[[ Group 3 ]]]]]]]]] { graphic57_data long file "completed.dat" graphic58_data long file "placefinger.dat" graphic59_data long file "removefinger.dat" graphic60_data long file "alreadyexists.dat" graphic110_data long file "printaccepted.dat" graphic111_data long file "pleasewait.dat" graphic112_data long file "slotnumber.dat" } '''[[[[[[[ Group 4 ]]]]]]]]] { graphic113_data long file "enterslot.dat" graphic114_data long file "confirmdelete.dat" graphic115_data long file "printnotfound.dat" graphic122_data long file "autolockmenu.dat" graphic123_data long file "autolockicon.dat" graphic124_data long file "autolockiconmask.dat" graphic125_data long file "privacy.dat" } '''[[[[[[[[[ KEEP IN DAT ]]]]]]]]]] graphic51_data long file "menulistmask.dat" 'KEEP IN graphic55_data long file "numbermask.dat" 'KEEP IN graphic22_data long file "mainarrows1.dat" 'slide graphic23_data long file "arrowleft1.dat" 'arrow1 graphic24_data long file "arrowright1.dat" 'arrow2 graphic25_data long file "locksymbol1.dat" 'unlocked 'graphic26_data long 'file "locked.dat" ' "Locked" text option graphic27_data long file "led1.dat" 'led ''''''''''''''''''''''''''''''''''''''''''''''' graphic116_data long file "v0.dat" graphic117_data long file "v1.dat" graphic118_data long file "v2.dat" graphic119_data long file "v3.dat" graphic120_data long file "vmask.dat" '''''''''''''''''''''''''''''''''''''''''''''''''' graphic00_data long 0[704] 'file "2.dat" DAT ' GRAPHICS INFO UserCharEnd long '******************************************************************* 'bitmap size and location data ' bpp, width, height, x, y, clr graphics1_info byte 1, 2, 4, 5, 13, 0 '1 graphics2_info byte 1, 2, 4, 5, 8, 0 '2 graphics3_info byte 1, 2, 4, 5, 3, 0 '2 graphics4_info byte 1, 2, 4, 10, 13, 0 '2 graphics5_info byte 1, 2, 4, 10, 8, 0 '2 graphics6_info byte 1, 2, 4, 10, 3, 0 '2 graphics7_info byte 1, 2, 4, 15, 13, 0 '2 graphics8_info byte 1, 2, 4, 15, 8, 0 '2 graphics9_info byte 1, 2, 4, 15, 3, 0 '2 graphics0_info byte 1, 2, 4, 20, 8, 0 '2 graphics15_info byte 1, 2, 4, 20, 3, 0 '2 graphics16_info byte 1, 2, 4, 20, 13, 0 '2 graphics11_info byte 1, 2, 4, 27, 13, 0 '2 graphics12_info byte 1, 2, 4, 27, 8, 0 '2 graphics13_info byte 1, 2, 4, 27, 3, 0 '2 graphics20_info byte 1, 2, 4, 1, rows-3, 0 'dado logo mask graphics21_info byte 1, 2, 4, 1, rows-3, 0 'dado logo graphics22_info byte 1, 2, 4, 9, 8, 0 'main arrows graphics23_info byte 1, 1, 2, 20, 14, 0 'arrow1 graphics24_info byte 1, 1, 2, 20, 2, 0 'arrow2 graphics25_info byte 1, 1, 2, 26, 8, 0 'unlocked 'graphics26_info byte 1, 2, 6, cols-2, 0, 0 '"locked" graphics27_info byte 1, 1, 2, 26, 2, 2 '"GREEN LED" ***** graphics28_info byte 1, 1, 2, 26, 2, 1 '"RED LED" ***** graphics29_info byte 1, 1, 2, 26, 2, 0 'Blue LED = not connected ''''graphics30_info byte 1, 1, 4, 24, 14, 0 'menumask 'graphics33_info byte 1, 1, 2, 24, 14, 0 'scroll up arrow 'graphics34_info byte 1, 1, 2, 28, 14, 0 'scroll down arrow 'graphics35_info byte 1, 1, 2, 24, 14, 0 'scroll up arrowmask 'graphics36_info byte 1, 1, 2, 28, 14, 0 'scroll down arrowmask graphics39_info byte 1, 2, 10, 24, 4, 0 'Enter admin# graphics40_info byte 1, 2, 10, 24, 4, 0 'menu options graphics41_info byte 1, 2, 10, 24, 4, 0 'toggle screen graphics42_info byte 1, 2, 10, 24, 4, 0 'change admin graphics43_info byte 1, 2, 10, 24, 4, 0 'change user graphics44_info byte 1, 2, 10, 24, 4, 0 'enter new print graphics45_info byte 1, 2, 10, 24, 4, 0 'delete print graphics46_info byte 1, 2, 10, 24, 4, 0 'delete all prints graphics47_info byte 1, 2, 10, 24, 4, 0 'set beep vol graphics50_info byte 1, 2, 10, 24, 4, 0 'Exit menu graphics51_info byte 1, 2, 10, 24, 4, 0 'menulistmask graphics52_info byte 1, 2, 10, 24, 4, 0 'exiting menu graphics53_info byte 1, 2, 10, 24, 4, 0 'accepted pw graphics54_info byte 1, 2, 10, 24, 4, 0 'enter new pw graphics56_info byte 1, 2, 10, 24, 4, 0 'accept change? graphics57_info byte 1, 2, 10, 24, 4, 0 'completed! graphics58_info byte 1, 2, 10, 24, 4, 0 'place finger! graphics59_info byte 1, 2, 10, 24, 4, 0 'Remove Finger graphics60_info byte 1, 2, 10, 24, 4, 0 'Already Exists '''password enter char 1 graphics61_info byte 1, 2, 4, 28, 14, 0 '1 graphics62_info byte 1, 2, 4, 28, 14, 0 '2 graphics63_info byte 1, 2, 4, 28, 14, 0 '3 graphics64_info byte 1, 2, 4, 28, 14, 0 '4 graphics65_info byte 1, 2, 4, 28, 14, 0 '5 graphics66_info byte 1, 2, 4, 28, 14, 0 '6 graphics67_info byte 1, 2, 4, 28, 14, 0 '7 graphics68_info byte 1, 2, 4, 28, 14, 0 '8 graphics69_info byte 1, 2, 4, 28, 14, 0 '9 graphics70_info byte 1, 2, 4, 28, 14, 0 '0 graphics101_info byte 1, 2, 4, 28, 14, 0 '0 graphics102_info byte 1, 2, 4, 28, 10, 0 '0 graphics103_info byte 1, 2, 4, 28, 6, 0 '0 graphics104_info byte 1, 2, 4, 28, 2, 0 '0 'bitmap size and location data ' bpp, width, height, x, y, clr graphics110_info byte 1, 2, 10, 24, 4, 0 'printe accepted graphics111_info byte 1, 2, 10, 24, 4, 0 'please wait graphics112_info byte 1, 2, 10, 24, 4, 0 'slot number graphics113_info byte 1, 2, 10, 24, 4, 0 'enter slot # graphics114_info byte 1, 2, 10, 24, 4, 0 'confirm delete graphics115_info byte 1, 2, 10, 24, 4, 0 'print not found graphics116_info byte 1, 1, 2, 29, 16, 0 'volume graphics120_info byte 1, 2, 2, 23, 8, 0 'A graphics121_info byte 1, 2, 10, 24, 4, 0 'Enter admin# graphics123_info byte 1, 1, 4, 28, 14, 0 'autolockicon <<<<<resize graphics124_info byte 1, 1, 4, 28, 14, 0 'autolockiconmask <<<<<resize graphics125_info byte 1, 1, 4, 28, 15, 0 'privacy <<<<<resizeI see graphics #61...70 have a big x value and a big width...
Strange things may happen if it tries to draw a bitmap that is not entirely within the screen bounds...
(Btw, my memory gets weird using alcohol)
That is because, like the ROM font, it stores 2 tiles of 1 bit data into one 2-bit tile...
But, you don't have to draw the second tile in your app, you can tell it just to draw 1 tile and that should work fine.