How compile IJP (jpeg library) on Windows in CodeBlocks IDE

[barracuda]

Note, I am runnin x86 machine and Win XP.

Finally I have found library to work with jpeg images
Independent JPEG Group

In the install.txt I have read I need to create makefile but don't know how. There are already dome makefiles, eg. makefile.vc but I think I need file for codeblocks.

[Nominal Animal]

This belongs in the Windows board, not the C board.

[Elkvis]

I think you'll probably need to build it from the command line. Most library distributions like that aren't available with project files for a particular IDE. You may be able to import the makefile with code::blocks. I'm not really sure what capabilities it has in that respect, but it's possible that it has an option to create a project by importing a makefile.

[stahta01]

I think you'll probably need to build it from the command line. Most library distributions like that aren't available with project files for a particular IDE. You may be able to import the makefile with code::blocks. I'm not really sure what capabilities it has in that respect, but it's possible that it has an option to create a project by importing a makefile.

Code::Blocks (CB) does NOT have the ability to convert an makefile to a normal CB Project.
But, it does have a option to use a custom makefile CB project instead of doing a normal CB Project.

But, it is much easier and faster to compile the makefile on the command line.
And, then if you need to do it again to create a CB custom makefile project.

Newbies tend to fail on creating CB custom makefile projects.
But, the people who know both normal CB Projects and GNU makefiles have only slight problem doing it.


NOTE: I think CB only support GNU makefiles; but, it might support others. I have only tried GNU makefiles, myself.

Tim S.

[barracuda]

I am completely lost and don't know what to do. What option in CB? Where is it? I don't see any custom makefile project in New project. But CB does not have any command line as far as I know so how can I compile it on command line? There are some programs in MinGW\bin but I don't know if I can use them to compile project. I know only Visual Studio C++ which has command line (I don't have it installed].

Also I don't know which files I need for the project. There are also some testing files with examples.

[stahta01]

Ignore that CB exists!

Open an command line normally cmd.exe

Type the make command needed to make the library build.
NOTE: This requires you to read the library documentation and likely to know information about the compiler you plan to use.
NOTE: Code::Blocks is NOT a Compiler.

Edit: I am lazy, so, I would try GnuWin32 build and see if it works for me before trying to build the library myself.
http://gnuwin32.sourceforge.net/packages/jpeg.htm

Tim S.

[barracuda]

But I want the library from Independent jpeg Group:
Independent JPEG Group
Not sure if that is the library you linked. You linked 10 years old library, the library from IJG is updated 2014.

I have downloaded the make.exe and dependencies. What to do then? I would use gcc. Oops, now I have found:mingw32-make.exe file located in MinGW\bin

[barracuda]

I searched for binaries for newest version (9a) and found this page:
JPEGclub.org
but I did not find the *.dll or *.lib. The binaries contain only *.exe

Do you know some modern library, different from libjpeg which is not old like hell? Because libjpeg's latest release is version 6b of 27-Mar-1998 ...

Same author IJG realeses version 9a but I cannot find the libraries.

[Nominal Animal]

On x86, x86-64, and ARM architectures the libjpeg-turbo, a vectorized derivative of the IJG JPEG library, is usually more efficient, and that's what is installed in my Linux machine. It seems to be well maintained.

The latest version (January 2015) is 1.4.0, and the official downloads include sources, Linux packages, Mac OS X disk image for installation, as well as self-extracting archives for different compilers for Windows.

The library supports the same API as IJG JPEG library, but also supports a "turbo" API of it's own. Both are portable, since both these libraries are quite portable, so use the one you're more comfortable with.

In particular, the libjpeg-turbo-1.4.0-gcc.exe is a self-extracting archive for 32-bit GCC in Windows. If you do not want to execute it, you can also use 7zip to open it as an archive. (I checked on my Linux machine.) If you only want the static libraries (assuming you want to compile a static binary for ease of use), just grab the libjpeg.a and libturbojpeg.a files from the lib directory in the archive, and the header files from the include directory, and you're ready to go. Otherwise, check the documentation; I don't know the details on how to set up the dynamic libraries in Windows.

GCC needs -Iinclude compiler flag to point to the include files, and -Llib to point to the library files, and -static flag to compile a static binary. I don't know how you set those in Code::Blocks. However, if you create an empty project and it creates a Makefile, then check if you have a CFLAGS and LDFLAGS assignments near the beginning. Typically, you'll want something like

CFLAGS := -Wall -std=c99 -Ipathtoincludedirectory
LDFLAGS := -Lpathtolibrarydirectory -ljpeg -lturbojpeg

Hopefully a Windows user with Code::Blocks will help you setting up your project.

[barracuda]

Thanks, I will try it.

In the meanwhile I have successfully installed MingGW and MingGW shell and I have tried to compile the libjpeg 9a - seemed all works fine except that on the end of messaging after I used the command make I got few errors. I don't know how to import specific makefile, but it seems it auto-choosed some make file.

[barracuda]

I am trying to compile the jpeg-turbo library.

Which file do I need to add to linker?
\bin\libturbojpeg.dll
and
\lib\libturbojpeg.dll.a
to linker.
or the libjpeg?

When I use the libjpeg.dll and libjpeg.a with the example code I got error:
main.c|127|undefined reference to `put_scanline_someplace'|

Is this line:

put_scanline_someplace(buffer[0], row_stride); // args: pointer & sample count.

what I should change? And if yes, should not be there something like:
buffer[i]?

I am not sure how to solve this.

[Nominal Animal]

If you only want the static libraries (assuming you want to compile a static binary for ease of use), just grab the libjpeg.a and libturbojpeg.a files from the lib directory in the archive, and the header files from the include directory, and you're ready to go. Otherwise, check the documentation; I don't know the details on how to set up the dynamic libraries in Windows.

Let me put it in another words:

If you were compiling your own program, say myprog.c to a static binary, myprog.exe, and you had lib\libjpeg.a and lib\libturbojpeg.a and the library headers in include\,

gcc -Wall -O2 -static -Iinclude -Llib myprog.c -ljpeg -lturbojpeg -o myprog.exe

should do the trick.

I suspect, but don't know and don't even really want to know as I don't really care one way or another, but for a dynamic build in Windows you probably need bin\libjpeg.dll and bin\libturbojpeg.dll and the library headers in include\,

gcc -Wall -O2 -Iinclude -Lbin myprog.c -ljpeg -lturbojpeg -o myprog.exe

should work. I guess.

Again, that's just a straightforward guess. I only use Linux. Like I posted earlier, this is Windows stuff, and has nothing, really, to do with C.

[barracuda]

I successfully compiled the project. Thanks. Can I ask something about the library or is it prohibited?

[Nominal Animal]

Can I ask something about the library

Sure, go ahead.

or is it prohibited?

I only said that this thread belongs in the Windows board. Apparently the admins disagree, or they would have moved the thread.

[barracuda]

Nice. So my problem is that I don't know how to copy data to the buffer of the raster image.

// shorten a bit
int read_JPEG_file (char * filename, char * RGB_buffer); // declaration of reading
int main()
{
char * filename = "sourcefile.jpg";
char * RGB_buffer; // Final image
read_JPEG_file(filename, RGB_buffer); // read the image
    return 0;
}

// implementation here - shorten
...
  while (cinfo.output_scanline < cinfo.output_height) {
    // strcpy(RGB_buffer, const char *src ---> buffer); // cannot use buffer, it is not const
    // (void) jpeg_read_scanlines(&cinfo, buffer, 1);
...

So how copy the buffer, obviously I cannot use strcpy.

Subquestion: Is it possible to add or use HSV colorspace? Reading the image directly into HSV could save me a lot of memory resources later. Otherwise I would need to do the RGB-->HSV conversion later.