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私はmingw（gccバージョン4.5.2）を使用しています。

PNG や BMP などの特定のファイルを開くと、segfault が発生します。128x128 PNG では正常に動作していましたが、より大きなファイルでテストを開始すると、segfault が発生し始めました。ただし、TGA 形式に問題はありません。ライブラリがほとんどの部分で機能することは知っていますが、このようにクラッシュして書き込みが行われるかどうかがわからないのは良くありません。

gdb は、何が起こっているかについてのヒントを私に与えません。ソースから DevIL をコンパイルでき、デバッグ dll (スクリプト--enable-debug用configure) をコンパイルしましたが、png をサポートしていないようです (png12 ライブラリを取得する必要があるようです)。

GIMP で作成した ~2MB の BMP を開こうとしています。GDB を介して実行すると、セグメンテーション違反が発生することもありますが、ヒープで何かが発生していることを警告することもあります (これまでに見たことのない多くのもの)。これは gdb の実行ダンプです。で始まるすべての行%%%は、私のプログラムに固有の出力です。残りは gdb からのものです。

$ gdb ./entropy_unittest_disp.exe loadpngdisplay
GNU gdb (GDB) 7.2
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "mingw32".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from c:\Users\Steven\Dropbox\Programming\entropy_p5_makefile\cpp
\game/./entropy_unittest_disp.exe...done.
c:\Users\Steven\Dropbox\Programming\entropy_p5_makefile\cpp\game/loadpngdisplay:
 No such file or directory.
(gdb) r
Starting program: c:\Users\Steven\Dropbox\Programming\entropy_p5_makefile\cpp\ga
me/./entropy_unittest_disp.exe
[New Thread 23284.0x5bb4]
%%%UNIT TEST BUILD: INTERNAL USE ONLY. DO NOT DISTRIBUTE
%%%Compiled on Sep 11 2011 at 09:45:38
%%%argc = 1: Main.cpp:119
%%%argv:
%%%0: c:\Users\Steven\Dropbox\Programming\entropy_p5_makefile\cpp\game/./entropy_un
%%%ittest_disp.exe
%%%←[36mStarting Test ilWritePng, at Image.cpp:8←[0m
%%%rm: cannot lstat `output_il.png': No such file or directory
%%%ilGetError() = 1292: Image.cpp:25
%%%Completed Test ilWritePng in 0.033 seconds
%%%←[36mStarting Test loadPNGDisplay, at Image.cpp:31←[0m
[New Thread 23284.0x445c]
[New Thread 23284.0x1fd8]
[New Thread 23284.0x1424]
%%%Number of Joysticks detected: 2
%%%Opening Joystick: Harmonix Guitar for Xbox 360 (Controller)
[New Thread 23284.0x526c]
[New Thread 23284.0x5a70]
[New Thread 23284.0x1ae8]
[New Thread 23284.0x5908]
[New Thread 23284.0x5974]
%%%Using GLEW 1.5.8
%%%OpenGL Vendor: NVIDIA Corporation
%%%OpenGL Renderer: GeForce GTX 260/PCI/SSE2
%%%OpenGL Version: 3.3.0
warning: HEAP[entropy_unittest_disp.exe]:
warning: Invalid address specified to RtlFreeHeap( 00350000, 04000000 )


Program received signal SIGTRAP, Trace/breakpoint trap.
0x772e0475 in ntdll!TpWaitForAlpcCompletion ()
   from C:\Windows\system32\ntdll.dll
(gdb) where
#0  0x772e0475 in ntdll!TpWaitForAlpcCompletion ()
   from C:\Windows\system32\ntdll.dll
#1  0x0028f510 in ?? ()
#2  0x772a29c0 in ntdll!RtlCopyExtendedContext ()
   from C:\Windows\system32\ntdll.dll
#3  0x03fffff8 in ?? ()
#4  0x772e14cf in ntdll!TpQueryPoolStackInformation ()
   from C:\Windows\system32\ntdll.dll
#5  0x00350000 in ?? ()
#6  0x7729ab3a in ntdll!AlpcMaxAllowedMessageLength ()
   from C:\Windows\system32\ntdll.dll
#7  0x00350000 in ?? ()
#8  0x77243472 in ntdll!RtlLargeIntegerShiftRight ()
   from C:\Windows\system32\ntdll.dll
#9  0x03fffff8 in ?? ()
#10 0x766398cd in msvcrt!free () from C:\Windows\syswow64\msvcrt.dll
#11 0x00350000 in ?? ()
#12 0x6180129c in _mm_free (aligned_ptr=0x8230020)
    at c:/mingw/bin/../lib/gcc/mingw32/4.5.2/include/mm_malloc.h:71
#13 0x61801370 in DefaultFreeFunc (ptr=0x8230020)
    at ./../src-IL/src/il_alloc.c:127
#14 0x618012ee in ifree (Ptr=0x8230020) at ./../src-IL/src/il_alloc.c:99
#15 0x618149f8 in iPreCache (Size=592128) at ./../src-IL/src/il_files.c:550
#16 0x618148a2 in iReadFile (Buffer=0x8100017, Size=1, Number=2313)
    at ./../src-IL/src/il_files.c:499
#17 0x61808cf5 in ilReadUncompBmp (Header=0x28f829)
    at ./../src-IL/src/il_bmp.c:486
#18 0x61808410 in iLoadBitmapInternal () at ./../src-IL/src/il_bmp.c:250
#19 0x618082f3 in ilLoadBmpF (File=0x766d2960) at ./../src-IL/src/il_bmp.c:199
#20 0x618082ba in ilLoadBmp (FileName=0x4c25f1 "folder.bmp")
    at ./../src-IL/src/il_bmp.c:184
#21 0x61830bf0 in ilLoadImage (FileName=0x4c25f1 "folder.bmp")
    at ./../src-IL/src/il_io.c:1827
#22 0x0040f66c in SDLSystemloadPNGDisplayHelper::RunImpl (this=0x28fc10)
    at Image.cpp:40
#23 0x00461e74 in UnitTest::ExecuteTest<SDLSystemloadPNGDisplayHelper> (
    testObject=..., details=...) at ../include/UnitTest++/ExecuteTest.h:25
#24 0x0040f2cd in TestSDLSystemloadPNGDisplay::RunImpl (this=0x4e5cf8)
    at Image.cpp:31
#25 0x00463023 in UnitTest::ExecuteTest<UnitTest::Test> (testObject=...,
    details=...) at src/ExecuteTest.h:25
#26 0x0044198d in UnitTest::Test::Run (this=0x4e5cf8) at src/Test.cpp:34
#27 0x00441d9a in UnitTest::TestRunner::RunTest (this=0x28fedc,
    result=0x3517f0, curTest=0x4e5cf8, maxTestTimeInMs=0)
    at src/TestRunner.cpp:61
#28 0x00466b7e in UnitTest::TestRunner::RunTestsIf<UnitTest::True> (
    this=0x28fedc, list=..., suiteName=0x0, predicate=..., maxTestTimeInMs=0)
    at ../include/UnitTest++/TestRunner.h:40
#29 0x004014e3 in UnitTest::RunAllTestsVerbose () at Main.cpp:72
#30 0x0040167d in main (argc=1, argv=0x3531d8) at Main.cpp:126
(gdb) c
Continuing.
warning: HEAP[entropy_unittest_disp.exe]:
warning: Invalid address specified to RtlFreeHeap( 00350000, 04000000 )


Program received signal SIGTRAP, Trace/breakpoint trap.
0x772e0475 in ntdll!TpWaitForAlpcCompletion ()
   from C:\Windows\system32\ntdll.dll
(gdb) c
Continuing.
warning: HEAP[entropy_unittest_disp.exe]:
warning: Invalid address specified to RtlFreeHeap( 00350000, 04000000 )


Program received signal SIGTRAP, Trace/breakpoint trap.
0x772e0475 in ntdll!TpWaitForAlpcCompletion ()
   from C:\Windows\system32\ntdll.dll
(gdb)
Continuing.
warning: HEAP[entropy_unittest_disp.exe]:
warning: Invalid address specified to RtlFreeHeap( 00350000, 04000000 )


Program received signal SIGTRAP, Trace/breakpoint trap.
0x772e0475 in ntdll!TpWaitForAlpcCompletion ()
   from C:\Windows\system32\ntdll.dll
(gdb)
Continuing.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 23284.0x5974]
0x05064225 in nvoglv32!DrvGetProcAddress ()
   from C:\Windows\SysWOW64\nvoglv32.dll
(gdb)
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x05064225 in nvoglv32!DrvGetProcAddress ()
   from C:\Windows\SysWOW64\nvoglv32.dll
(gdb)
Continuing.

Program exited with code 030000000005.
(gdb)
The program is not being run.
(gdb) r
Starting program: c:\Users\Steven\Dropbox\Programming\entropy_p5_makefile\cpp\ga
me/./entropy_unittest_disp.exe
[New Thread 23428.0x49b8]
%%%UNIT TEST BUILD: INTERNAL USE ONLY. DO NOT DISTRIBUTE
%%%Compiled on Sep 11 2011 at 09:45:38
%%%argc = 1: Main.cpp:119
%%%argv:
%%%0: c:\Users\Steven\Dropbox\Programming\entropy_p5_makefile\cpp\game/./entropy_un
%%%ittest_disp.exe
%%%←[36mStarting Test ilWritePng, at Image.cpp:8←[0m

Program received signal SIGSEGV, Segmentation fault.
0x7723dfc4 in ntdll!LdrWx86FormatVirtualImage ()
   from C:\Windows\system32\ntdll.dll
(gdb) where
#0  0x7723dfc4 in ntdll!LdrWx86FormatVirtualImage ()
   from C:\Windows\system32\ntdll.dll
#1  0x1f002150 in ?? ()
#2  0x00000000 in ?? ()
(gdb)

テストilWritePngは、実際には .tga イメージ ファイルを書き込むだけです。そのテストはリリース dll (md5 = 59E291838AE2C88F5F71108E4845A84B) で問題なく動作しますが、コンパイルしたこのデバッグ ビルドにはさらに問題があります。

ドキュメントに目を通し、10 分ほどで DevIL を起動して実行できるようになったときは、とてもうれしかったです。私はそれが私に多くの仕事を節約するだろうと思った...

これにより、独自の画像ファイル形式を実装する必要があるかどうか疑問に思い始めています (PPM バイナリを使用して、圧縮ストリームを介して押し込みます)。

編集: ソースコード:

#include "Texture.h" // for Pixel struct
#include "Script.h" // for lua (quick and dirty shell access)
TEST_FIXTURE(ILSystem, ilWritePng) { // ILSystem calls ilInit(), ilShutDown() in ctor, dtor respectively
    ILuint image;
    ilGenImages(1,&image);
    CHECK(ilGetError()==0);
    ilBindImage(image);
    Pixel pixels[128*128];
    for (int i=0;i<128;++i) { for (int j=0;j<128;++j) {
        Pixel &p = pixels[i*128+j];
        p.b = 0; p.g = i; p.r = j; p.a = 0xff;
    }} // neat and simple test image, a greenish purplish gradient type thing.
    CHECK(ilTexImage(128,128,1,4,IL_BGRA, IL_UNSIGNED_BYTE,pixels));
    CHECK(ilGetError()==0);
    {
        LuaSystem l;
        l.dostring("os.execute(\"rm output_il.tga\")"); // delete that file
    }
    ilSaveImage("output_il.tga");
    PRINT_INT(ilGetError());
}

#ifdef LOAD_DISPLAY
#include "SDLOGL.h"
#include "Texture.h"
TEST_FIXTURE(SDLSystem, loadPNGDisplay) { // takes care of initing SDL and opengl context
    ILSystem s; // RAII = peace of mind
    // i can't use two fixtures in one unittest. but this does the same thing anyway.
    ILuint image;
    CHECK(ilGetError()==0);
    ilGenImages(1,&image);
    CHECK(ilGetError()==0);
    ilBindImage(image);
    CHECK(ilGetError()==0);
    ilLoadImage("folder.bmp");
    CHECK(ilGetError()==0);
    ILubyte *pixelData = ilGetData(); CHECK(pixelData);
    CHECK(ilGetError()==0);
    GLuint tex = loadImage32(pixelData,ilGetInteger(IL_IMAGE_WIDTH),ilGetInteger(IL_IMAGE_HEIGHT),0);
    // i do not know exactly how its encoded. but it seems like when loading pngs it is in RGBA format
    PRINT_INT(ilGetInteger(IL_FORMAT_MODE));
    CHECK(ilGetError()==0);
    initOrthoRender();
    drawTexture(tex);
    CHECK(glGetError()==0);
    SDL_GL_SwapBuffers();
    SLEEP(500);
}
#endif //LOAD_DISPLAY
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