Icons as C header files. How can I change these?

[Laterix]

I just love sylpheed (http://sylpheed.sraoss.jp/en/) e-mail client, but the icons are butt ugly! So I want to change these icons. I downloaded the source package from the website and found out that icons are in /src/icons as xpm, png and h files. I can change the xpm-files and changes are applied after I compile the program.

If I change .png files these changes won't have any effect. Old icons are still used. It seems that there is a header file for each png file. For example stock_inbox.png and stock_inbox.h. So the application probably uses only those headers.

Now, my question is: How can I create a C-header file from PNG or is this even possible? I really want to change these icons. Hopefully someone can help me with this.

Here is the content of stock_inbox.h

/* GdkPixbuf RGBA C-Source image dump 1-byte-run-length-encoded */

#ifdef __SUNPRO_C
#pragma align 4 (stock_inbox)
#endif
#ifdef __GNUC__
static const guint8 stock_inbox[] __attribute__ ((__aligned__ (4))) =
#else
static const guint8 stock_inbox[] =
#endif
{ ""
/* Pixbuf magic (0x47646b50) */
"GdkP"
/* length: header (24) + pixel_data (703) */
"\0\0\2\327"
/* pixdata_type (0x2010002) */
"\2\1\0\2"
/* rowstride (64) */
"\0\0\0@"
/* width (16) */
"\0\0\0\20"
/* height (16) */
"\0\0\0\20"
/* pixel_data: */
"\206\0\0\0\0\1\0\0\0.\202\0\0\0\377\1\0\0\0\23\212 \0\0\0\0\7\0\0\0.\0"
"\0\0\377\245\236\222\377\335\333\326\377\366\366\3 65\377\0\0\0\377\0"
"\0\0\23\207\0\0\0\0\12\0\0\0.\0\0\0\377\252\244\23 1\377\343\341\336\377"
"\204|m\377+)$\377\256\250\235\377\364\363\362\377\ 0\0\0\377\0\0\0\23"
"\204\0\0\0\0\5\0\0\0.960\377\267\262\250\377\343\3 41\336\377\316\312"
"\303\377\202\15\14\12\377\6)'\"\377qk^\377\331\327\322\377\364\363\362"
"\377\0\0\0\377\0\0\0\23\203\0\0\0\0\16\0\0\0\377\3 72\372\371\377\310"
"\304\275\377\0\0\0\377\12\12\11\377\30\26\23\377FA 9\377xqc\377\204|m"
"\377\220\210y\377\341\336\332\377\364\363\362\377\ 0\0\0\377\0\0\0\23"
"\202\0\0\0\0\21\0\0\0\377\377\377\377\377\345\343\ 340\377FA9\377HC;\377"
"c]R\377xqc\377\207\177p\377\224\214}\377\234\225\207 \377\236\230\213"
"\377\341\336\332\377\364\363\362\377\0\0\0\377\0\0 \0\23\0\0\0\0\0\0\0"
"\377\202\377\377\377\377\15\345\343\340\377(&!\377c]R\377zse\377\217"
"\207x\377\235\226\210\377\240\232\215\377\241\233\ 216\377\244\235\221"
"\377\331\327\322\377\366\365\364\377\0\0\0\377\0\0 \0\23\211\0\0\0\377"
"\6\212\204z\377\245\236\222\377\250\241\225\377\25 2\244\231\377\341\336"
"\332\377\362\361\357\377\202\0\0\0\377\207\377\377 \377\377\13\0\0\0\377"
"qlc\377\210\203{\377\257\251\236\377\261\254\241\3 77\304\300\271\377"
"\331\327\322\377hhh\377\0\0\0\377\377\377\377\377\ 357\357\357\377\204"
"Ki\203\377\10\314\314\314\377\0\0\0\377hd\\\377\21 2\205|\377\272\266"
"\254\377\323\321\314\377\210\205\201\377WRH\377\20 2\0\0\0\377\1\377\377"
"\377\377\202\357\357\357\377\203Ki\203\377\6\314\3 14\314\377\0\0\0\377"
"d_V\377\270\265\256\377\223\220\213\377XUN\377\202 \0\0\0\377\4\0\0\0"
"4\0\0\0\377\377\377\377\377\357\357\357\377\204Ki\ 203\377\4\314\314\314"
"\377\0\0\0\377urk\377^ZT\377\202\0\0\0\377\1\0\0\0 C\202\0\0\0\0\2\0\0"
"\0\377\377\377\377\377\203Ki\203\377\3\357\357\357 \377Ki\203\377\314"
"\314\314\377\203\0\0\0\377\1\0\0\0C\204\0\0\0\0\4\ 0\0\0\377\377\377\377"
"\377\357\357\357\377Ki\203\377\203\357\357\357\377 \3\314\314\314\377"
"\0\0\0\377\0\0\0N\206\0\0\0\0\2\0\0\0\377\377\377\ 377\377\206\314\314"
"\314\377\1\30\30\30\377\207\0\0\0\0\202\0\0\0\377\ 1\11\11\11\377\206"
"\0\0\0\377\207\0\0\0\0"};

[WW]

The program gdk-pixbuf-csource (http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/gdk-pixbuf-csource.html) does this. Something like this should work:

$ gdk-pixbuf-csource myicon.png > myicon.h

Take a look at the gdk-pixbuf web page (http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/index.html) for more information.

[Laterix]

The program gdk-pixbuf-csource (http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/gdk-pixbuf-csource.html) does this. Something like this should work:

$ gdk-pixbuf-csource myicon.png > myicon.h

Take a look at the gdk-pixbuf web page (http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/index.html) for more information.
Thanks for the tip! This looks exactly what I was looking for.

[Laterix]

I got it to work. Thanks again.

I used commands like this to create those header files.

gdk-pixbuf-csource --build-list stock_mail-forward stock_mail-forward.png > stock_mail-forward.h

Sadly, I had to modify some of the headers after generation. For example in stock_mail-forward.h I had to change all stock_mail-forward to stock_mail_forward.

Just in case that someone else is interested to change these icons.

Here is a screenshot (http://users.utu.fi/ljtaim/pics/sylpheed.png) of what I achieved. I find it much more beautiful than the original look (http://sylpheed.sraoss.jp/images/sylpheed2-mainwindow.png).