C版本
其实不用严格限制为C，C++也行。
注意，要测试之类的最好先安装GIMP和gimptool-2.0，两者都要。
sudo apt install gimp libgimp2.0-dev
然后，由于三篇原文已经由人翻译了，我这儿就只给出官方链接和翻译文章的的链接。
对了，这些教程只对2.0~2.10版本有用，对于库上最新的2.99或3.x版本没用。
官方链接：
How to write a GIMP plug-in，
How to write a GIMP plug-in, part II，
How to write a GIMP plug-in, part III。
API参考
翻译文章链接：
[翻译]如何编写GIMP插件(一)
[翻译]如何编写GIMP插件(二)
如何编写GIMP插件(三)
python版本和scheme版本
官方ppt：
GIMP Scripts and Plug-ins 2011
GIMP Scripts and Plug-ins 2010
python
也是分成主函数，运行函数和注册数据三大步。其中自然也报错位于菜单的哪一项。
#!/usr/bin/env python
# Hello World in GIMP Python
from gimpfu import *
def hello_world(initstr, font, size, color) :
# First do a quick sanity check on the font
if font == 'Comic Sans MS' :
initstr = "Comic Sans? Are you sure?"
# Make a new image. Size 10x10 for now -- we'll resize later.
img = gimp.Image(1, 1, RGB)
# Save the current foreground color:
pdb.gimp_context_push()
# Set the text color
gimp.set_foreground(color)
# Create a new text layer (-1 for the layer means create a new layer)
layer = pdb.gimp_text_fontname(img, None, 0, 0, initstr, 10,
True, size, PIXELS, font)
# Resize the image to the size of the layer
img.resize(layer.width, layer.height, 0, 0)
# Background layer.
# Can't add this first because we don't know the size of the text layer.
background = gimp.Layer(img, "Background", layer.width, layer.height,
RGB_IMAGE, 100, NORMAL_MODE)
background.fill(BACKGROUND_FILL)
img.add_layer(background, 1)
# Create a new image window
gimp.Display(img)
# Show the new image window
gimp.displays_flush()
# Restore the old foreground color:
pdb.gimp_context_pop()
register(
"python_fu_hello_world",
"Hello world image",
"Create a new image with your text string",
"Akkana Peck",
"Akkana Peck",
"2010",
"Hello world (Py)...",
"", # Create a new image, don't work on an existing one
[
(PF_STRING, "string", "Text string", 'Hello, world!'),
(PF_FONT, "font", "Font face", "Sans"),
(PF_SPINNER, "size", "Font size", 50, (1, 3000, 1)),
(PF_COLOR, "color", "Text color", (1.0, 0.0, 0.0))
],
[],
hello_world, menu="<Image>/File/Create")
main()
scheme版本
同样也是3大步，但是菜单注册单独出来了， main消失了，看起来像是直接执行定义的函数。
; "Hello, World" Test
;
; Creates an image with the text "Hello, World!"
; Copyright 2010, Akkana Peck
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
(define (script-fu-helloworld text font size colour)
(gimp-context-push)
(gimp-context-set-foreground colour)
(let* (
; initial image size is 10x10 -- we'll resize it later
(img (car (gimp-image-new 10 10 RGB)))
(dummy (gimp-image-undo-disable img))
(text-layer (car (gimp-text-fontname img -1 0 0 text 10
TRUE size PIXELS font)))
(width (car (gimp-drawable-width text-layer)))
(height (car (gimp-drawable-height text-layer)))
)
(gimp-image-resize img width height 0 0)
(gimp-image-undo-enable img)
(gimp-display-new img)
(gimp-context-pop)
))
(script-fu-register "script-fu-helloworld"
"_Hello World (SF)..."
"Creates an image with a user specified text string."
"Akkana Peck <akkana@shallowsky.com>"
"Akkana Peck"
"May, 2010"
""
SF-STRING "Text string" "Hello, World!"
SF-FONT "Font" "Sans"
SF-ADJUSTMENT "Font size (pixels)" '(100 2 1000 1 10 0 1)
SF-COLOR "Color" '(255 0 0)
)
(script-fu-menu-register "script-fu-helloworld"
"<Image>/File/Create")
源码阅读，关于MAIN宏
# define MAIN() \
int \
main (int argc, char *argv[]) \
{ \
return gimp_main (&PLUG_IN_INFO, argc, argv); \
}
gint gimp_main (const GimpPlugInInfo *info,
gint argc,
gchar *argv[]);
具体的函数定义：
gint
gimp_main (const GimpPlugInInfo *info,
gint argc,
gchar *argv[])
{
enum
{
ARG_PROGNAME,
ARG_GIMP,
ARG_READ_FD,
ARG_WRITE_FD,
ARG_MODE,
ARG_STACK_TRACE_MODE,
N_ARGS
};
gchar *basename;
const gchar *env_string;
gchar *debug_string;
#ifdef G_OS_WIN32
gint i, j, k;
/* Reduce risks */
{
typedef BOOL (WINAPI *t_SetDllDirectoryA) (LPCSTR lpPathName);
t_SetDllDirectoryA p_SetDllDirectoryA;
p_SetDllDirectoryA = (t_SetDllDirectoryA) GetProcAddress (GetModuleHandle ("kernel32.dll"),
"SetDllDirectoryA");
if (p_SetDllDirectoryA)
(*p_SetDllDirectoryA) ("");
}
/* On Windows, set DLL search path to $INSTALLDIR/bin so that GEGL
file operations can find their respective file library DLLs (such
as jasper, etc.) without needing to set external PATH. */
{
const gchar *install_dir;
gchar *bin_dir;
LPWSTR w_bin_dir;
int n;
w_bin_dir = NULL;
install_dir = gimp_installation_directory ();
bin_dir = g_build_filename (install_dir, "bin", NULL);
n = MultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS,
bin_dir, -1, NULL, 0);
if (n == 0)
goto out;
w_bin_dir = g_malloc_n (n + 1, sizeof (wchar_t));
n = MultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS,
bin_dir, -1,
w_bin_dir, (n + 1) * sizeof (wchar_t));
if (n == 0)
goto out;
SetDllDirectoryW (w_bin_dir);
out:
if (w_bin_dir)
g_free (w_bin_dir);
g_free (bin_dir);
}
#ifdef HAVE_EXCHNDL
/* Use Dr. Mingw (dumps backtrace on crash) if it is available. */
{
time_t t;
gchar *filename;
gchar *dir;
/* This has to be the non-roaming directory (i.e., the local
directory) as backtraces correspond to the binaries on this
system. */
dir = g_build_filename (g_get_user_data_dir (),
GIMPDIR, GIMP_USER_VERSION, "CrashLog",
NULL);
/* Ensure the path exists. */
g_mkdir_with_parents (dir, 0700);
time (&t);
filename = g_strdup_printf ("%s-crash-%" G_GUINT64_FORMAT ".txt",
g_get_prgname(), t);
plug_in_backtrace_path = g_build_filename (dir, filename, NULL);
g_free (filename);
g_free (dir);
/* Similar to core crash handling in app/signals.c, the order here
* is very important!
*/
if (! _prevExceptionFilter)
_prevExceptionFilter = SetUnhandledExceptionFilter (gimp_plugin_sigfatal_handler);
ExcHndlInit ();
ExcHndlSetLogFileNameA (plug_in_backtrace_path);
}
#endif
#ifndef _WIN64
{
typedef BOOL (WINAPI *t_SetProcessDEPPolicy) (DWORD dwFlags);
t_SetProcessDEPPolicy p_SetProcessDEPPolicy;
p_SetProcessDEPPolicy = GetProcAddress (GetModuleHandle ("kernel32.dll"),
"SetProcessDEPPolicy");
if (p_SetProcessDEPPolicy)
(*p_SetProcessDEPPolicy) (PROCESS_DEP_ENABLE|PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION);
}
#endif
/* Group all our windows together on the taskbar */
{
typedef HRESULT (WINAPI *t_SetCurrentProcessExplicitAppUserModelID) (PCWSTR lpPathName);
t_SetCurrentProcessExplicitAppUserModelID p_SetCurrentProcessExplicitAppUserModelID;
p_SetCurrentProcessExplicitAppUserModelID = (t_SetCurrentProcessExplicitAppUserModelID) GetProcAddress (GetModuleHandle ("shell32.dll"),
"SetCurrentProcessExplicitAppUserModelID");
if (p_SetCurrentProcessExplicitAppUserModelID)
(*p_SetCurrentProcessExplicitAppUserModelID) (L"gimp.GimpApplication");
}
/* Check for exe file name with spaces in the path having been split up
* by buggy NT C runtime, or something. I don't know why this happens
* on NT (including w2k), but not on w95/98.
*/
for (i = 1; i < argc; i++)
{
k = strlen (argv[i]);
if (k > 10)
{
if (g_ascii_strcasecmp (argv[i] + k - 4, ".exe") == 0)
{
/* Found the end of the executable name, most probably.
* Splice the parts of the name back together.
*/
GString *s;
s = g_string_new (argv[ARG_PROGNAME]);
for (j = 1; j <= i; j++)
{
s = g_string_append_c (s, ' ');
s = g_string_append (s, argv[j]);
}
argv[ARG_PROGNAME] = s->str;
/* Move rest of argv down */
for (j = 1; j < argc - i; j++)
argv[j] = argv[j + i];
argv[argc - i] = NULL;
argc -= i;
break;
}
}
}
#endif
g_assert (info != NULL);
PLUG_IN_INFO = *info;
if ((argc != N_ARGS) || (strcmp (argv[ARG_GIMP], "-gimp") != 0))
{
g_printerr ("%s is a GIMP plug-in and must be run by GIMP to be used\n",
argv[ARG_PROGNAME]);
return 1;
}
gimp_env_init (TRUE);
progname = argv[ARG_PROGNAME];
basename = g_path_get_basename (progname);
g_set_prgname (basename);
env_string = g_getenv ("GIMP_PLUGIN_DEBUG");
if (env_string)
{
const gchar *debug_messages;
debug_string = strchr (env_string, ',');
if (debug_string)
{
gint len = debug_string - env_string;
if ((strlen (basename) == len) &&
(strncmp (basename, env_string, len) == 0))
{
gimp_debug_flags =
g_parse_debug_string (debug_string + 1,
gimp_debug_keys,
G_N_ELEMENTS (gimp_debug_keys));
}
}
else if (strcmp (env_string, basename) == 0)
{
gimp_debug_flags = GIMP_DEBUG_DEFAULT;
}
/* make debug output visible by setting G_MESSAGES_DEBUG */
debug_messages = g_getenv ("G_MESSAGES_DEBUG");
if (debug_messages)
{
gchar *tmp = g_strconcat (debug_messages, ",LibGimp", NULL);
g_setenv ("G_MESSAGES_DEBUG", tmp, TRUE);
g_free (tmp);
}
else
{
g_setenv ("G_MESSAGES_DEBUG", "LibGimp", TRUE);
}
}
g_free (basename);
stack_trace_mode = (GimpStackTraceMode) CLAMP (atoi (argv[ARG_STACK_TRACE_MODE]),
GIMP_STACK_TRACE_NEVER,
GIMP_STACK_TRACE_ALWAYS);
#ifndef G_OS_WIN32
/* No use catching these on Win32, the user won't get any meaningful
* stack trace from glib anyhow. It's better to let Windows inform
* about the program error, and offer debugging if the plug-in
* has been built with MSVC, and the user has MSVC installed.
*/
gimp_signal_private (SIGHUP, gimp_plugin_sigfatal_handler, 0);
gimp_signal_private (SIGINT, gimp_plugin_sigfatal_handler, 0);
gimp_signal_private (SIGQUIT, gimp_plugin_sigfatal_handler, 0);
gimp_signal_private (SIGTERM, gimp_plugin_sigfatal_handler, 0);
gimp_signal_private (SIGABRT, gimp_plugin_sigfatal_handler, 0);
gimp_signal_private (SIGBUS, gimp_plugin_sigfatal_handler, 0);
gimp_signal_private (SIGSEGV, gimp_plugin_sigfatal_handler, 0);
gimp_signal_private (SIGFPE, gimp_plugin_sigfatal_handler, 0);
/* Ignore SIGPIPE from crashing Gimp */
gimp_signal_private (SIGPIPE, SIG_IGN, 0);
/* Restart syscalls interrupted by SIGCHLD */
gimp_signal_private (SIGCHLD, SIG_DFL, SA_RESTART);
#endif
#ifdef G_OS_WIN32
_readchannel = g_io_channel_win32_new_fd (atoi (argv[ARG_READ_FD]));
_writechannel = g_io_channel_win32_new_fd (atoi (argv[ARG_WRITE_FD]));
#else
_readchannel = g_io_channel_unix_new (atoi (argv[ARG_READ_FD]));
_writechannel = g_io_channel_unix_new (atoi (argv[ARG_WRITE_FD]));
#endif
g_io_channel_set_encoding (_readchannel, NULL, NULL);
g_io_channel_set_encoding (_writechannel, NULL, NULL);
g_io_channel_set_buffered (_readchannel, FALSE);
g_io_channel_set_buffered (_writechannel, FALSE);
g_io_channel_set_close_on_unref (_readchannel, TRUE);
g_io_channel_set_close_on_unref (_writechannel, TRUE);
gp_init ();
gimp_wire_set_writer (gimp_write);
gimp_wire_set_flusher (gimp_flush);
gimp_enums_init ();
/* initialize units */
{
GimpUnitVtable vtable;
vtable.unit_get_number_of_units = _gimp_unit_cache_get_number_of_units;
vtable.unit_get_number_of_built_in_units =
_gimp_unit_cache_get_number_of_built_in_units;
vtable.unit_new = _gimp_unit_cache_new;
vtable.unit_get_deletion_flag = _gimp_unit_cache_get_deletion_flag;
vtable.unit_set_deletion_flag = _gimp_unit_cache_set_deletion_flag;
vtable.unit_get_factor = _gimp_unit_cache_get_factor;
vtable.unit_get_digits = _gimp_unit_cache_get_digits;
vtable.unit_get_identifier = _gimp_unit_cache_get_identifier;
vtable.unit_get_symbol = _gimp_unit_cache_get_symbol;
vtable.unit_get_abbreviation = _gimp_unit_cache_get_abbreviation;
vtable.unit_get_singular = _gimp_unit_cache_get_singular;
vtable.unit_get_plural = _gimp_unit_cache_get_plural;
gimp_base_init (&vtable);
}
/* initialize i18n support */
setlocale (LC_ALL, "");
bindtextdomain (GETTEXT_PACKAGE"-libgimp", gimp_locale_directory ());
#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
bind_textdomain_codeset (GETTEXT_PACKAGE"-libgimp", "UTF-8");
#endif
/* set handler both for the "LibGimp" and "" domains */
{
const gchar * const log_domains[] =
{
"LibGimp",
"LibGimpBase",
"LibGimpColor",
"LibGimpConfig",
"LibGimpMath",
"LibGimpModule",
"LibGimpThumb",
"LibGimpWidgets"
};
gint i;
for (i = 0; i < G_N_ELEMENTS (log_domains); i++)
g_log_set_handler (log_domains[i],
G_LOG_LEVEL_MESSAGE,
gimp_message_func,
NULL);
g_log_set_handler (NULL,
G_LOG_LEVEL_MESSAGE,
gimp_message_func,
NULL);
}
if (gimp_debug_flags & GIMP_DEBUG_FATAL_WARNINGS)
{
GLogLevelFlags fatal_mask;
fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
g_log_set_always_fatal (fatal_mask);
g_log_set_handler (NULL,
G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL |
G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL,
gimp_fatal_func, NULL);
}
else
{
g_log_set_handler (NULL,
G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL,
gimp_fatal_func, NULL);
}
if (strcmp (argv[ARG_MODE], "-query") == 0)
{
if (PLUG_IN_INFO.init_proc)
gp_has_init_write (_writechannel, NULL);
if (gimp_debug_flags & GIMP_DEBUG_QUERY)
gimp_debug_stop ();
if (PLUG_IN_INFO.query_proc)
(* PLUG_IN_INFO.query_proc) ();
gimp_close ();
return EXIT_SUCCESS;
}
if (strcmp (argv[ARG_MODE], "-init") == 0)
{
if (gimp_debug_flags & GIMP_DEBUG_INIT)
gimp_debug_stop ();
if (PLUG_IN_INFO.init_proc)
(* PLUG_IN_INFO.init_proc) ();
gimp_close ();
return EXIT_SUCCESS;
}
if (gimp_debug_flags & GIMP_DEBUG_RUN)
gimp_debug_stop ();
else if (gimp_debug_flags & GIMP_DEBUG_PID)
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, "Here I am!");
temp_proc_ht = g_hash_table_new (g_str_hash, g_str_equal);
g_io_add_watch (_readchannel,
G_IO_ERR | G_IO_HUP,
gimp_plugin_io_error_handler,
NULL);
gimp_loop ();
return EXIT_SUCCESS;
}
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