http://bugs.winehq.com/show_bug.cgi?id=740
*** shadow/740 Fri May 31 13:26:39 2002 --- shadow/740.tmp.7952 Fri May 31 13:26:50 2002 *************** *** 251,253 **** --- 251,300 ----
------- Additional Comments From Speeddymon@yahoo.com 2002-05-31 13:26 ------- Adding Andriy to CC's + + ------- Additional Comments From Speeddymon@yahoo.com 2002-05-31 13:26 ------- + ok, I have some info on the problem... + + here is basically what happens: + + fgBits gets initialized ;) + fgBits gets set to zero + then things screw up... + + but you knew that I know, just keep reading... + + 2 lines below where fgBits gets set to zero, xmax gets set to whatever, + possibly zero, same with ymax... + + then we run a for on y=0 and compare it to ymax + inside there we run a for on x=0 and compare it to xmax... + then theres a switch that may be important to this bug + and then the crucial if (red+green+blue > threshold) + which is the only place that fgBits gets incremented before that divide by zero + error, so obviously 1 of 3 things is happening: + + 1) ymax is being set to zero and so the for fails + 2) xmax is being set to zero and so the for fails + 3) red+green+blue is not being set high enough to pass the threshold if + + and so fgBits++ isn't taking place... + + now that I have looked back up at the switch, I see that lo and behold: + + theChar = theImage[byteIndex++]; + red = theChar; + + and like david said above, the whole theImage array is failing... + + now, since I don't have access to a Linux box ATM (i have to go home to access + it) I can't add my own trace messages to see what is causing theImage to fail, + but it looks like either + + 1) byteIndex++ isn't working for some really weird reason + 2) byteIndex++ is working, but theImage[1] doesn't exist + 3) &theMask[ptr->nWidth/8 * ptr->nHeight]; isn't working... + + So... I will add my stuff tonight and try to post the results tomorrow.... + + all of this information is against the current mouse.c, not rev 1.2 which is + the first version with this problem... \ No newline at end of file