我在 mingw（gcc 版本 4.5.2）。
打开某些文件（包括 PNG 和 BMP）时出现段错误。它在 128x128 PNG 上运行良好，但是当我开始使用更大的文件进行测试时，我开始遇到段错误。不过，TGA 格式没有问题。我知道该库大部分时间都在工作，但不知道它是否会决定像这样崩溃和烧毁并不好。
gdb 没有给我任何关于正在发生的事情的提示。我能够从源代码编译 DevIL，并编译了一个调试 dll（--enable-debug用于configure脚本），但它似乎不支持 png（似乎我需要一个 png12 库），但它并没有让我走得太远。
我正在尝试打开我在 GIMP 中制作的 ~2MB BMP。我通过 GDB 运行它，它有时会出现段错误，但有时它会警告堆上发生了一些事情（很多我以前从未见过的事情）。这是一个 gdb 运行转储。所有以我的程序开头的行%%%都是特定于我的程序的输出，其余的来自 gdb。
$ 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)
测试ilWritePng实际上只是让它编写一个 .tga 图像文件。该测试适用于发布 dll (md5 = 59E291838AE2C88F5F71108E4845A84B) 但我编译的这个调试版本有更多问题。
当我浏览文档并在大约 10 分钟内启动并运行 DevIL 时，我非常高兴。我想它会为我节省很多工作......
这让我开始怀疑我是否应该只实现自己的图像文件格式（我会使用 PPM 二进制文件并将其推入压缩流）。
编辑：源代码：
#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