[Fixed] My PNG a splode (2.0.92)

[Risen]

I know I fed it a potentially strange PNG file (640x480, 2 color), imported as straight data, then called by a hudmessage. So, while this may be a case of "don't do that" I also remember randy saying a fatal error should always be reported.

Code: Select all

Code: ACCESS_VIOLATION
Tried to read address 00000141
Flags: 00000000
Address: 00000141

Windows NT 5.1 Build 2600 Service Pack 2

GS=0000  FS=003b  ES=0023  DS=0023
EAX=00000001  EBX=00000001  ECX=00000000  EDX=00000001
ESI=00000004  EDI=00000003
EBP=00000001  EIP=00000141  ESP=0012fac8  CS=001b  SS=0023
EFlags=00290246
 CF- PF+ AF- ZF+ SF- TF- IF+ DF- OF- NT- RF+ VM- AC- VI+ VP-

FPU State:
 ControlWord=027f StatusWord=4020 TagWord=ffff
 ErrorOffset=00000000
 ErrorSelector=00000000
 DataOffset=00000000
 DataSelector=ffff0000
 Cr0NpxState=00000000

MM0=0000000000000000
MM1=000000a7006b006b
MM2=0000f708f708f708
MM3=0000000000000000
MM4=0000000000000000
MM5=0000000400000003
MM6=0000000100000001
MM7=000000230012fac8

Running threads:
00000fe0 at 00000141*
00000fe8
00000fec
00000ffc
0000069c
00000718
00000690
00000178
00000184

Loaded modules:
00400000 - 00675fff  zdoom.exe
7c900000 - 7c9affff  ntdll.dll
7c800000 - 7c8f3fff  kernel32.dll
773d0000 - 774d1fff  COMCTL32.dll
77c10000 - 77c67fff  msvcrt.dll
77dd0000 - 77e6afff  ADVAPI32.dll
77e70000 - 77f00fff  RPCRT4.dll
77f10000 - 77f55fff  GDI32.dll
77d40000 - 77dcffff  USER32.dll
77f60000 - 77fd5fff  SHLWAPI.dll
71ad0000 - 71ad8fff  WSOCK32.dll
71ab0000 - 71ac6fff  WS2_32.dll
71aa0000 - 71aa7fff  WS2HELP.dll
76b40000 - 76b6cfff  WINMM.dll
10000000 - 10095fff  fmod.dll
77be0000 - 77bf4fff  MSACM32.dll
774e0000 - 7761bfff  ole32.dll
763b0000 - 763f8fff  comdlg32.dll
7c9c0000 - 7d1d3fff  SHELL32.dll
76f50000 - 76f57fff  wtsapi32.dll
76360000 - 7636ffff  WINSTA.dll
5b860000 - 5b8b3fff  NETAPI32.dll
77fe0000 - 77ff0fff  Secur32.dll
73f10000 - 73f6bfff  dsound.dll
77c00000 - 77c07fff  VERSION.dll
76c30000 - 76c5dfff  WINTRUST.dll
77a80000 - 77b13fff  CRYPT32.dll
77b20000 - 77b31fff  MSASN1.dll
76c90000 - 76cb7fff  IMAGEHLP.dll
72d20000 - 72d28fff  wdmaud.drv
72d10000 - 72d17fff  msacm32.drv
77bd0000 - 77bd6fff  midimap.dll
73ee0000 - 73ee3fff  KsUser.dll
76fd0000 - 7704efff  CLBCATQ.DLL
77120000 - 771abfff  OLEAUT32.dll
77050000 - 77114fff  COMRes.dll
6ce10000 - 6ce47fff  dinput8.dll
688f0000 - 688f8fff  HID.DLL
77920000 - 77a12fff  SETUPAPI.DLL
73760000 - 737a8fff  ddraw.dll
73bc0000 - 73bc5fff  DCIMAN32.dll

Bytes near EIP:
00000131: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
00000141: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
00000151: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

ZDoom version 2.0.92 "Stinkoman"

Command line:
 C:\old_D\Doom\60\zdoom.exe -iwad C:\old_D\Doom\doom2.wad -file D:\project\ze1\ZD1RES.WAD C:\old_D\Doom\60\tempmap.wad -map MAP01 -skill 3
IWAD: doom2.wad

Current map: MAP01

viewx = -33554432
viewy = 341
viewz = 343
viewangle = 1073741824

Possible call trace:
 00000141  BOOM
 004ee198  call [00642804]
 00485fc2  call 004edfd0
 00489ef8  call 00485600
 004ae8b6  call 00489d00
 004ae801  call [edx+0x18]
 004b1639  call 004ae5d0
 0041a74d  call 004190c0
 0041a758  call 0051056e
 004f8e93  call 004f89e0
 004b8e1e  call 004b1160
 00416b23  call [edx+0xc]
 00417a4f  call 004168d0
 0042cfc8  call 00409970
 0040af23  call 0040ae70
 0040af23  call 0040ae70
 004a1361  call 0040af10
 004a1463  call 0051056e
 0049e513  call 00417a80
 0049e825  call 0049e160
 00513a1a  call 0049e7b0
 005138ae  call 00511310
 00513896

Stack Contents:
0012fac8: 004ee198 00000001 0a32d890 00033330  ··N·······2·03··
0012fad8: 0000cccc 0012fb00 00000000 00000000  ················
0012fae8: 00485fc2 00000001 00000000 0a378fe9  ·_H···········7·
0012faf8: 000001e1 00beb337 0a6f11a8 03200000  ····7·····o··· ·
0012fb08: 00010000 00000000 00000320 0012fb00  ········ ·······
0012fb18: ffffffff 00000258 00000000 00000280  ····X···········
0012fb28: 00000000 00000320 00000002 01610048  ···· ·······H·a·
0012fb38: 00000000 00000000 000001e0 00000000  ················
0012fb48: 00000007 00489ef8 00c111c8 00000320  ······H····· ···
0012fb58: 00000000 00000000 8000138d 00000000  ················
0012fb68: 00000002 0012fbac 00000000 000001e0  ················
0012fb78: 00000000 0a345f60 00000000 0000000a  ····`_4·········
0012fb88: 00000000 00000280 00000000 004ae8b6  ··············J·
0012fb98: 00c111c8 0000000b 00000000 00000000  ················
0012fba8: 0a378fe8 80001396 00000280 80001397  ··7·············
0012fbb8: 000001e0 00000000 004ae801 00000000  ··········J·····
0012fbc8: 00000000 00000000 0012fc00 000001e0  ················
0012fbd8: 00000000 00394a78 0012fcdc 00000258  ····xJ9·····X···
0012fbe8: 00000000 00000001 0012fc00 00000258  ············X···
0012fbf8: 000001e0 406e0000 00c1c7f8 004b1639  ······n@····9·K·
0012fc08: 000001e0 00000001 00394a78 0012fcdc  ········xJ9·····
0012fc18: 00000001 00000000 00394a78 00000000  ········xJ9·····
0012fc28: 00000000 00000000 00000000 ffd9a000  ················
0012fc38: 61bcd604 1cc57bb8 0041a74d 61bcd604  ···a·{··M·A····a
0012fc48: 0041a758 00cb28f8 01010000 00010000  X·A··(··········
0012fc58: 004f8e93 0173b810 00170000 00206000  ··O···s······` ·
0012fc68: 00000000 61bcd604 00000000 0012fcdc  ·······a········
0012fc78: 00000000 00000000 1cc57bb8 004b8e1e  ·········{····K·
0012fc88: 00000001 0000026e 00000000 00416b23  ····n·······#kA·
0012fc98: 00000001 00000001 00c19a98 00000000  ················
0012fca8: 42b40000 6236d408 fffff7ad 00417a4f  ···B··6b····OzA·
0012fcb8: 0000026e 00c19a98 00000001 0042cfc8  n·············B·
0012fcc8: 00000000 0012fcb8 0012fe04 00521d45  ············E·R·
0012fcd8: 00000000 00000004 000000f8 0012fe6c  ············l···
0012fce8: 0000017e dc885d36 00bfcef0 129ed9e8  ~···6]··········
0012fcf8: f4dc2775 6d6f6f44 7475412e 616f6c6f  u'··Doom.Autoloa
0012fd08: 30360064 696b732f ff00736e 00902a15  d·60/skins···*··
0012fd18: 92ae8eb5 60e00d45 23d040c8 3fbdb38a  ····E··`·@·#···?
0012fd28: 3a20a03a ac534f58 8978216f 269023d5  :· :XOS·o!x··#·&
0012fd38: 36dbc112 775286c7 77605998 00000002  ···6··Rw·Y`w····
0012fd48: 00000001 00000002 1cc57bb8 0040af23  ·········{··#·@·
0012fd58: 0012fd64 00000002 1cc57bb8 0040af23  d········{··#·@·
0012fd68: 0012fd74 004a1361 005503c0 004a1463  t···a·J···U·c·J·
0012fd78: 00000094 00000005 00000001 00000a28  ············(···
0012fd88: 00000002 76726553 20656369 6b636150  ····Service Pack
0012fd98: 77003220 775289af 001597e0 8007000e   2·w··Rw········
0012fda8: 776059bc 774e4314 00000000 0012fdd8  ·Y`w·CNw········
0012fdb8: 77551c27 001597e0 7c80977b 0012fe00  '·Uw····{··|····
0012fdc8: 00000000 77605914 0012fdf8 774f43e3  ·····Y`w·····COw
0012fdd8: 00000001 00000000 00000002 00000000  ················
0012fde8: 00000000 0000026e 0000017e 00000002  ····n···~·······
0012fdf8: 0012fe08 00c57bb8 1cc57bb8 0012fe60  ·····{···{··`···
0012fe08: 00521d68 ffffffff 0049e513 ffffffff  h·R·······I·····
0012fe18: 7c80e00d 7ffda000 00000000 00000000  ···|···········
0012fe28: 0000026e 0000017e 00000001 000f4240  n···~·······@B··
0012fe38: 0012fe2c 00000020 00000276 00000000  ,··· ···v·······
0012fe48: 00400000 00400240 00400218 7c800000  ··@·@·@···@····|
0012fe58: 00400000 0012fe14 0012fe88 005232a0  ··@··········2R·
0012fe68: 00000000 0012fe98 0049e825 7c80b529  ········%·I·)··|
0012fe78: 00000000 7ffda000 0012fe74 0012f6ec  ·······t·······
0012fe88: 0012ffb0 00513658 0054fa48 00000000  ····X6Q·H·T·····
0012fe98: 0012ffc0 00513a1a 00400000 00000000  ·····:Q···@·····
0012fea8: 0015232d 00000005 00000094 00000005  -#··············
0012feb8: 00000001 00000a28 00000002 76726553  ····(·······Serv
0012fec8: 20656369 6b636150 b7003220 e2f78000  ice Pack 2······
0012fed8: e2f79000 e2f7a000 e2f7b000 e2f7c000  ················
0012fee8: e2f7d000 e2f7e000 e2f7f000 e2f80000  ················
0012fef8: e2f81000 e2f82000 e2f83000 e2f84000  ····· ···0···@··
0012ff08: e2f85000 e2f86000 81bd69d0 ff676980  ·P···`···i···ig·
0012ff18: 0001b454 00000001 00000015 00000000  T···············
0012ff28: 00000015 00001f78 8055ef80 b7670c48  ····x·····U·H·g·
0012ff38: 80549631 823f6000 005138ae 0012d2f4  1·T··`?··8Q·····
0012ff48: 00000018 7ffda000 00000044 00153600  ·······D····6··
0012ff58: 001535b0 00153660 00000000 00000000  ·5··`6··········
0012ff68: 00000000 00000000 00000000 00000000  ················
0012ff78: 00000000 00000001 00000005 00000000  ················
0012ff88: ffffffff ffffffff ffffffff 00000408  ················
0012ff98: 00000000 00000001 0015232d 00000000  ········-#······
0012ffa8: 0012feb0 8058a6b8 0012ffe0 00513658  ······X·····X6Q·
0012ffb8: 00597800 00000000 0012fff0 7c816d4f  ·xY·········Om·|
0012ffc8: 0012d2f4 00000018 7ffda000 8054b038  ···········8·T·
0012ffd8: 0012ffc8 81bd69d0 ffffffff 7c8399f3  ·····i·········|
0012ffe8: 7c816d58 00000000 00000000 00000000  Xm·|············
0012fff8: 00513896 00000000                    ·8Q·····

[randi]

Prompted by your post, I just got done adding support for loading 1, 2, and 4 bit PNG images. It works with my test image, but my test image didn't crash before I added the support either; it just looked garbled yet still recognizable. There might be something else causing it to crash with yours, though I doubt it. Probably fixed now.

[Risen]

On further inspection of the offending image, it appears to be a 2-color 8-bit PNG, not a 1-bit image.

It didn't display, but it didn't crash.
But, the not displaying thing could easily be my hudmessages using a different positioning scheme and expecting a different size image now.

[randi]

Well, if you decide your hudmessage is correct and it should display, can I see the image?

[GeeDougg]

Now why the HELL would someone make a 2-color 8-bit PNG...????

[Graf Zahl]

Because it compresses better???

[GeeDougg]

Nein. I believe a 2-bit would compress better than an 8-bit. Afterall, it's 2 bit, and only 2 colours are used, whereas with 8-bit you're not making use of 254 of the other colour....

[Graf Zahl]

But it still compresses better because a ZIP based compressor can detect redundancies much better if each pixel is its separate byte.

[GeeDougg]

Redundancies are "reduced", not removed. The data will still need to be there for when it's decompressed, (I.E., a shadow of the 256-colour map will still be there, and even if the compressio excludes that, it will still need to remember that the file was 256-colour, as opposed to, say, 4 colour.... And last time I checked, 256 is a bigger number than 4 (and has more characters). Also, AFAIK PNG files don't have zip-based compression....

[Graf Zahl]

Well, apparently you don't much about PNG's.

1. They use ZLIB for compression and that is the same algorithm that's used in ZIP files.
2. I have worked enough with this stuff and can tell you that in many cases an 8-bit PNG compresses better. For the simple reason that if you combine more than one pixel into one byte it will become much harder to detect redundant patterns of pixels. If they are shifted by one pixel from one line to the next with 8-bit format they will be recognized ans reduced to almost nothing. With a 2- or 4- bit format you will get completely different data that can't be packed further. And the less bits there are per pixel the more likely is it that patterns can't be detected.
And let's not forget that one compression stage in PNG is a Huffman packer which reduces the amount of bits needed for each byte in the source data. If you only have 2 different colors they will make up the majority of the source data and reduced to almost the same amount as in a 2-bit format (but much better compressed in the first stage) I can tell you for certain that compressing 17-color pictures always gives better results than using 16-color pictures. I have done that often enough to squeeze some space out of the cell-phone games I am developing.

[Risen]

Sorry for the delay on this, I was working on other parts and just recently got back to it. I don't have the previous image anymore, but here's one I do have. Also, here's a crash log for it from .94

Code: Select all

Code: ACCESS_VIOLATION
Tried to read address 00000100
Flags: 00000000
Address: 00000100

Windows NT 5.1 Build 2600 Service Pack 2

GS=0000  FS=003b  ES=0023  DS=0023
EAX=00000000  EBX=00000000  ECX=00000000  EDX=00000000
ESI=00000004  EDI=00000002
EBP=00000000  EIP=00000100  ESP=0012fb44  CS=001b  SS=0023
EFlags=00290246
 CF- PF+ AF- ZF+ SF- TF- IF+ DF- OF- NT- RF+ VM- AC- VI+ VP-

FPU State:
 ControlWord=027f StatusWord=0020 TagWord=ffff
 ErrorOffset=100126f4
 ErrorSelector=0158001b
 DataOffset=10047a04
 DataSelector=ffff0023
 Cr0NpxState=00000000

MM0=9fa6e90000000000
MM1=d79c218fe43e2800
MM2=924bc25bdf800000
MM3=8000000000000000
MM4=0000000000000000
MM5=0000000400000002
MM6=0000000000000000
MM7=000000230012fb44

Running threads:
00000560 at 00000100*
00000ab8
000008e8
000008b4
00000914
00000c94
000009cc
00000b90
000000a0

Loaded modules:
00400000 - 00678fff  zdoom.exe
7c900000 - 7c9affff  ntdll.dll
7c800000 - 7c8f3fff  kernel32.dll
773d0000 - 774d1fff  COMCTL32.dll
77c10000 - 77c67fff  msvcrt.dll
77dd0000 - 77e6afff  ADVAPI32.dll
77e70000 - 77f00fff  RPCRT4.dll
77f10000 - 77f55fff  GDI32.dll
77d40000 - 77dcffff  USER32.dll
77f60000 - 77fd5fff  SHLWAPI.dll
71ad0000 - 71ad8fff  WSOCK32.dll
71ab0000 - 71ac6fff  WS2_32.dll
71aa0000 - 71aa7fff  WS2HELP.dll
76b40000 - 76b6cfff  WINMM.dll
10000000 - 10095fff  fmod.dll
77be0000 - 77bf4fff  MSACM32.dll
774e0000 - 7761bfff  ole32.dll
763b0000 - 763f8fff  comdlg32.dll
7c9c0000 - 7d1d3fff  SHELL32.dll
76f50000 - 76f57fff  wtsapi32.dll
76360000 - 7636ffff  WINSTA.dll
5b860000 - 5b8b3fff  NETAPI32.dll
77fe0000 - 77ff0fff  Secur32.dll
73f10000 - 73f6bfff  dsound.dll
77c00000 - 77c07fff  VERSION.dll
76c30000 - 76c5dfff  WINTRUST.dll
77a80000 - 77b13fff  CRYPT32.dll
77b20000 - 77b31fff  MSASN1.dll
76c90000 - 76cb7fff  IMAGEHLP.dll
72d20000 - 72d28fff  wdmaud.drv
72d10000 - 72d17fff  msacm32.drv
77bd0000 - 77bd6fff  midimap.dll
73ee0000 - 73ee3fff  KsUser.dll
76fd0000 - 7704efff  CLBCATQ.DLL
77120000 - 771abfff  OLEAUT32.dll
77050000 - 77114fff  COMRes.dll
6ce10000 - 6ce47fff  dinput8.dll
688f0000 - 688f8fff  HID.DLL
77920000 - 77a12fff  SETUPAPI.DLL
73760000 - 737a8fff  ddraw.dll
73bc0000 - 73bc5fff  DCIMAN32.dll

Bytes near EIP:
000000f0: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
00000100: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
00000110: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

ZDoom version 2.0.94

Command line:
 D:\zdoom\zdoom.exe -iwad C:\old_D\Doom\doom2.wad -file D:\project\ze1\resource.wad D:\zdoom\tempmap.wad -map MAP11 -skill 3
IWAD: doom2.wad

Current map: MAP11

viewx = 273997226
viewy = 272
viewz = 274
viewangle = 3834226545

Possible call trace:
 00000100  BOOM
 004f0198  call [00645ddc]
 004873c2  call 004effd0
 0048b2f8  call 00486a00
 004b0146  call 0048b100
 004b0091  call [edx+0x18]
 004b3119  call 004afe60
 00416d6c  call 004b3080
 00417c9f  call 00416b00
 0042d278  call 00409ac0
 0040b0b3  call 0040b000
 0040b0b3  call 0040b000
 004a2841  call 0040b0a0
 004a2943  call 0051265e
 0049f9e3  call 00417cd0
 0049fcf5  call 0049f630
 00515b0a  call 0049fc80
 0051599e  call 00513400
 00515986

Stack Contents:
0012fb44: 004f0198 00000000 00c0c050 00040000  ··O·····P·······
0012fb54: 00010000 0012fb7c 00000000 00000000  ····|···········
0012fb64: 004873c2 00000001 00000000 00c22fb1  ·sH··········/··
0012fb74: 000001e1 0a4bfe19 0a70156c 02800000  ······K·l·p·····
0012fb84: 00010000 00000000 00000280 0012fb7c  ············|···
0012fb94: ffffffff 000001e0 00000000 00000280  ················
0012fba4: 00000000 00000280 00000002 00c5a008  ················
0012fbb4: 00000000 00000000 000001e0 00010000  ················
0012fbc4: ffffffff 0048b2f8 00c0cfb0 00000280  ······H·········
0012fbd4: 00000000 00000000 8000138d 00000000  ················
0012fbe4: 00000002 0012fc28 00000000 000001e0  ····(···········
0012fbf4: 00000000 0a4eb008 00000000 0000000a  ······N·········
0012fc04: 00000000 00000280 00000000 004b0146  ············F·K·
0012fc14: 00c0cfb0 0000000b 00000000 00000000  ················
0012fc24: 00c22fb0 80001396 00000280 80001397  ·/··············
0012fc34: 000001e0 00000000 004b0091 00000000  ··········K·····
0012fc44: 00000000 00000000 00000000 000001e0  ················
0012fc54: 000001e0 0a44bfa0 0012fcdc 00394650  ······D·····PF9·
0012fc64: 00000000 00000001 00000000 fffffffe  ················
0012fc74: 00000000 00000000 00befa98 004b3119  ·············1K·
0012fc84: 000001e0 0000026e 00000000 00000001  ····n···········
0012fc94: 00416d6c 00000001 00000001 0039a4a0  lmA···········9·
0012fca4: 00000000 42b40000 05b40686 ffffe994  ·······B········
0012fcb4: 00417c9f 0000026e 0039a4a0 00000001  ·|A·n·····9·····
0012fcc4: 0042d278 00000000 0012fcb8 0012fe04  x·B·············
0012fcd4: 00523e35 00000000 00000004 000000f8  5>R·············
0012fce4: 0012fe6c 0000017e cc458c60 00bf16b8  l···~···`·E·····
0012fcf4: 3d44dc3b 8db85bb3 6d6f6f44 7475412e  ;·D=·[··Doom.Aut
0012fd04: 616f6c6f d4000064 db58380b 208081eb  oload····8X···· 
0012fd14: 3e3b4017 62e20320 744f32d7 5061ae49  ·@;> ··b·2OtI·aP
0012fd24: efb9466a 47cbfbb1 f370db77 b31894ba  jF·····Gw·p·····
0012fd34: 8dbbf9bb b6941e60 775286c7 77605998  ····`·····Rw·Y`w
0012fd44: 00000002 00000001 00000002 68db70d3  ·············p·h
0012fd54: 0040b0b3 0012fd64 00000002 68db70d3  ··@·d········p·h
0012fd64: 0040b0b3 0012fd74 004a2841 005534f0  ··@·t···A(J··4U·
0012fd74: 004a2943 00000094 00000005 00000001  C)J·············
0012fd84: 00000a28 00000002 76726553 20656369  (·······Service 
0012fd94: 6b636150 77003220 775289af 001597a8  Pack 2·w··Rw····
0012fda4: 8007000e 776059bc 774e4314 00000000  ·····Y`w·CNw····
0012fdb4: 0012fdd8 77551c27 001597a8 7c80977b  ····'·Uw····{··|
0012fdc4: 0012fe00 00000000 77605914 0012fdf8  ·········Y`w····
0012fdd4: 774f43e3 00000001 00000000 00000002  ·COw············
0012fde4: 00000000 00000000 0000026e 0000017e  ········n···~···
0012fdf4: 00000002 0012fe08 00db70d3 68db70d3  ·········p···p·h
0012fe04: 0012fe60 00523e58 ffffffff 0049f9e3  `···X>R·······I·
0012fe14: ffffffff 7c80e00d 7ffd5000 00000000  ·······|·P·····
0012fe24: 00000000 0000026e 0000017e 00000001  ····n···~·······
0012fe34: 000f4240 0012fe2c 00000020 00000276  @B··,··· ···v···
0012fe44: 00000000 00400000 00400240 00400218  ······@·@·@···@·
0012fe54: 7c800000 00400000 0012fe14 0012fe88  ···|··@·········
0012fe64: 005253b0 00000000 0012fe98 0049fcf5  ·SR···········I·
0012fe74: 7c80b529 00000000 7ffd5000 0012fe74  )··|·····P·t···
0012fe84: 0012f768 0012ffb0 00515748 00552b90  h·······HWQ··+U·
0012fe94: 00000000 0012ffc0 00515b0a 00400000  ·········[Q···@·
0012fea4: 00000000 00152325 00000005 00000094  ····%#··········
0012feb4: 00000005 00000001 00000a28 00000002  ········(·······
0012fec4: 76726553 20656369 6b636150 00003220  Service Pack 2··
0012fed4: e308c000 e308d000 e308e000 e308f000  ················
0012fee4: e3090000 e3091000 e3092000 e3093000  ········· ···0··
0012fef4: e3094000 e3095000 e3096000 e3097000  ·@···P···`···p··
0012ff04: e3098000 ffffffff f8281c08 81a38da8  ··········(·····
0012ff14: 00000300 00018948 00000001 0000000d  ····H···········
0012ff24: 00000000 0000000d 0000208c 8055ef80  ········· ····U·
0012ff34: f8281c48 80549631 823f6000 0051599e  H·(·1·T··`?··YQ·
0012ff44: 0012d2f4 00000018 7ffd5000 00000044  ·········P·D···
0012ff54: 001535d8 00153588 00153638 00000000  ·5···5··86······
0012ff64: 00000000 00000000 00000000 00000000  ················
0012ff74: 00000000 00000000 00000001 00000005  ················
0012ff84: 00000000 ffffffff ffffffff ffffffff  ················
0012ff94: 00000408 00000000 00000001 00152325  ············%#··
0012ffa4: 00000000 0012feb0 8058a6b8 0012ffe0  ··········X·····
0012ffb4: 00515748 0059aa90 00000000 0012fff0  HWQ···Y·········
0012ffc4: 7c816d4f 0012d2f4 00000018 7ffd5000  Om·|·········P·
0012ffd4: 8054b038 0012ffc8 81a38da8 ffffffff  8·T·············
0012ffe4: 7c8399f3 7c816d58 00000000 00000000  ···|Xm·|········
0012fff4: 00000000 00515986 00000000           ·····YQ·····

[randi]

Can I assume from the file name that this is an interlaced PNG? I don't have support for that right now. Should I add it?

[Risen]

It's a series of black and transparent lines, intended to create an interlacing effect. I didn't interlace the graphic. (Though it's possible it got saved that way...)

[Csonicgo]

Can I assume from the file name that this is an interlaced PNG? I don't have support for that right now. Should I add it?

that would rock, please do.

[randi]

Fixed. The problem isn't that this is a PNG at all but that it has so many transparent regions per column. A standard Doom image would have crashed the same way, because it exceeds assumptions I made about the number of transparent areas that would need to be handled per column.

that would rock, please do.

Can I ask why? The only thing an interlaced PNG offers over a non-interlaced one is that it has better behavior when progressively displaying it in a web browser.