Writing appl. generated graphics on hard disk

[Babak Sayyid Hosseini]

Dear DevIL users,

I am trying to export application generated graphics into a file and browsed
the corresponding DeVIL tutorial on http://openil.sourceforge.net/tuts/tut_5/index.htm :

<code>

ILubyte *Lump;
ILuint Size;
FILE *File;

File = fopen("monkey.tga", "rb");
fseek(File, 0, SEEK_END);
Size = ftell(File);

Lump = (ILubyte*)malloc(Size);
fseek(File, 0, SEEK_SET);
fread(Lump, 1, Size, File);
fclose(File);

ilLoadL(IL_TGA, Lump, Size);
free(Lump);

</code>

The above example loads graphics (+ file header) from a file into memory.
A subsequent ilSaveImage(..) will of course write the whole lump into a new file.

As one is typically not interested in setting up an image header for every supported
format though, we wanted to know whether there is a possibility to use a built in DevIL image
encoder and marshaller that sets up the corresponding image headers for a disired
image type automatically (or based on few parameters passed).

This is what we are willing to do (in code):

   ilInit();
   iluInit();
   ilutRenderer(ILUT_OPENGL);

   pluginImageID = 0;
   ilGenImages(1, &pluginImageID);
   ilBindImage(pluginImageID); 

   const unsigned char bufferWidth = 64;
   const unsigned char bufferHeight = 64;
   GLubyte buffer[bufferWidth][bufferHeight][4];
   int i, j, c;
   for (i = 0; i < bufferHeight; i++) {
      for (j = 0; j < bufferWidth; j++) {
         c = (((i & 0x8) == 0) ^((j & 0x8) == 0)) * 255;
         buffer[i][j][0] = (unsigned char) c;
         buffer[i][j][1] = (unsigned char) c;
         buffer[i][j][2] = (unsigned char) c;
         buffer[i][j][3] = (unsigned char) 128;
      }
   }

   ILboolean loadingSucceeded = ilLoadL(IL_WHATEVER_??, buffer, 64*64*4);
   ILenum errorType = ilGetError();
   const wchar_t* errorString = iluErrorString(errorType);

   const wchar_t* outputFilename = L"D:\\home\\babak\\DevIL_TestExport.png";
   ILboolean savingSuccedded = ilSaveImage(outputFilename);    
   

Thanks,

Babak Sayyid Hosseini

[Denton Woods]

You probably want to look at using ilTexImage for what you are trying instead of ilLoadL.

[Babak Sayyid Hosseini]

Thank you Denton,
the function does the job.

Regards,

Babak Sayyid Hosseini