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gimp/plug-ins/common/aa.c

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/**
* aa.c version 1.0
* A plugin that uses libaa (ftp://ftp.ta.jcu.cz/pub/aa) to save images as
* ASCII.
* NOTE: This plugin *requires* aalib 1.2 or later. Earlier versions will
* not work.
* Code copied from all over the GIMP source.
* Tim Newsome <nuisance@cmu.edu>
*/
/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <aalib.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/*
* Declare some local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gboolean save_aa (gint32 drawable_ID,
gchar *filename,
gint output_type);
static void gimp2aa (gint32 drawable_ID,
aa_context *context);
static gint type_dialog (gint selected);
static void type_dialog_toggle_update (GtkWidget *widget,
gpointer data);
/*
* Some global variables.
*/
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
/**
* Type the user selected. (Global for easier UI coding.)
*/
static gint selected_type = 0;
MAIN ()
static void
query (void)
{
static GimpParamDef save_args[] =
{
{GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive"},
{GIMP_PDB_IMAGE, "image", "Input image"},
{GIMP_PDB_DRAWABLE, "drawable", "Drawable to save"},
{GIMP_PDB_STRING, "filename", "The name of the file to save the image in"},
{GIMP_PDB_STRING, "raw_filename", "The name entered"},
{GIMP_PDB_STRING, "file_type", "File type to use"}
};
gimp_install_procedure ("file_aa_save",
"Saves grayscale image in various text formats",
"This plug-in uses aalib to save grayscale image "
"as ascii art into a variety of text formats",
"Tim Newsome <nuisance@cmu.edu>",
"Tim Newsome <nuisance@cmu.edu>",
"1997",
N_("ASCII art"),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (save_args), 0,
save_args, NULL);
gimp_plugin_menu_register ("file_aa_save", "<Save>");
gimp_register_file_handler_mime ("file_aa_save", "text/plain");
gimp_register_save_handler ("file_aa_save",
"txt,ansi,text",
"");
}
/**
* Searches aa_formats defined by aalib to find the index of the type
* specified by string.
* -1 means it wasn't found.
*/
static gint
get_type_from_string (const gchar *string)
{
gint type = 0;
aa_format **p = (aa_format **) aa_formats;
while (*p && strcmp ((*p)->formatname, string))
{
p++;
type++;
}
if (*p == NULL)
return -1;
return type;
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[2];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
gint output_type = 0;
gint32 image_ID;
gint32 drawable_ID;
GimpExportReturn export = GIMP_EXPORT_CANCEL;
INIT_I18N ();
/* Set us up to return a status. */
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
run_mode = param[0].data.d_int32;
image_ID = param[1].data.d_int32;
drawable_ID = param[2].data.d_int32;
/* eventually export the image */
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
case GIMP_RUN_WITH_LAST_VALS:
gimp_ui_init ("aa", FALSE);
export = gimp_export_image (&image_ID, &drawable_ID, "AA",
(GIMP_EXPORT_CAN_HANDLE_RGB |
GIMP_EXPORT_CAN_HANDLE_GRAY |
GIMP_EXPORT_CAN_HANDLE_ALPHA ));
if (export == GIMP_EXPORT_CANCEL)
{
values[0].data.d_status = GIMP_PDB_CANCEL;
return;
}
break;
default:
break;
}
if (! (gimp_drawable_is_rgb (drawable_ID) ||
gimp_drawable_is_gray (drawable_ID)))
{
status = GIMP_PDB_CALLING_ERROR;
}
if (status == GIMP_PDB_SUCCESS)
{
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data ("file_aa_save", &output_type);
output_type = type_dialog (output_type);
if (output_type < 0)
status = GIMP_PDB_CANCEL;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 6)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
output_type = get_type_from_string (param[5].data.d_string);
if (output_type < 0)
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data ("file_aa_save", &output_type);
break;
default:
break;
}
}
if (status == GIMP_PDB_SUCCESS)
{
if (save_aa (drawable_ID, param[3].data.d_string, output_type))
{
gimp_set_data ("file_aa_save", &output_type, sizeof (output_type));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
}
if (export == GIMP_EXPORT_EXPORT)
gimp_image_delete (image_ID);
values[0].data.d_status = status;
}
/**
* The actual save function. What it's all about.
* The image type has to be GRAY.
*/
static gboolean
save_aa (gint32 drawable_ID,
gchar *filename,
gint output_type)
{
aa_savedata savedata;
aa_context *context;
aa_format format = *aa_formats[output_type];
format.width = gimp_drawable_width (drawable_ID) / 2;
format.height = gimp_drawable_height (drawable_ID) / 2;
/* Get a libaa context which will save its output to filename. */
savedata.name = filename;
savedata.format = &format;
context = aa_init (&save_d, &aa_defparams, &savedata);
if (!context)
return FALSE;
gimp2aa (drawable_ID, context);
aa_flush (context);
aa_close (context);
return TRUE;
}
static void
gimp2aa (gint32 drawable_ID,
aa_context *context)
{
GimpDrawable *drawable;
GimpPixelRgn pixel_rgn;
aa_renderparams *renderparams;
gint width;
gint height;
gint x, y;
gint bpp;
guchar *buffer;
guchar *p;
drawable = gimp_drawable_get (drawable_ID);
width = aa_imgwidth (context);
height = aa_imgheight (context);
bpp = drawable->bpp;
gimp_tile_cache_ntiles ((width / gimp_tile_width ()) + 1);
gimp_pixel_rgn_init (&pixel_rgn,
drawable, 0, 0, width, height,
FALSE, FALSE);
buffer = g_new (guchar, width * bpp);
for (y = 0; y < height; y++)
{
gimp_pixel_rgn_get_row (&pixel_rgn, buffer, 0, y, width);
switch (bpp)
{
case 1: /* GRAY */
for (x = 0, p = buffer; x < width; x++, p++)
aa_putpixel (context, x, y, *p);
break;
case 2: /* GRAYA, blend over black */
for (x = 0, p = buffer; x < width; x++, p += 2)
aa_putpixel (context, x, y, (p[0] * (p[1] + 1)) >> 8);
break;
case 3: /* RGB */
for (x = 0, p = buffer; x < width; x++, p += 3)
aa_putpixel (context, x, y,
GIMP_RGB_INTENSITY (p[0], p[1], p[2]) + 0.5);
break;
case 4: /* RGBA, blend over black */
for (x = 0, p = buffer; x < width; x++, p += 4)
aa_putpixel (context, x, y,
((guchar) (GIMP_RGB_INTENSITY (p[0], p[1], p[2]) + 0.5)
* (p[3] + 1)) >> 8);
break;
default:
g_assert_not_reached ();
break;
}
}
g_free (buffer);
renderparams = aa_getrenderparams ();
renderparams->dither = AA_FLOYD_S;
aa_render (context, renderparams, 0, 0,
aa_scrwidth (context), aa_scrheight (context));
}
static gint
type_dialog (gint selected)
{
GtkWidget *dlg;
GtkWidget *toggle;
GtkWidget *frame;
GtkWidget *toggle_vbox;
GSList *group;
/* Create the actual window. */
dlg = gimp_dialog_new (_("Save as Text"), "aa",
NULL, 0,
gimp_standard_help_func, "file-aa-save",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
/* file save type */
frame = gimp_frame_new (_("Data Formatting"));
gtk_container_set_border_width (GTK_CONTAINER (frame), 12);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
toggle_vbox = gtk_vbox_new (FALSE, 6);
gtk_container_add (GTK_CONTAINER (frame), toggle_vbox);
group = NULL;
{
aa_format **p = (aa_format **) aa_formats;
gint current = 0;
while (*p != NULL)
{
toggle = gtk_radio_button_new_with_label (group, (*p)->formatname);
group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_vbox), toggle, FALSE, FALSE, 0);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (type_dialog_toggle_update),
(gpointer) (*p)->formatname);
if (current == selected)
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), TRUE);
p++;
current++;
}
}
gtk_widget_show (toggle_vbox);
gtk_widget_show (frame);
gtk_widget_show (dlg);
if (gimp_dialog_run (GIMP_DIALOG (dlg)) != GTK_RESPONSE_OK)
selected_type = -1;
gtk_widget_destroy (dlg);
return selected_type;
}
static void
type_dialog_toggle_update (GtkWidget *widget,
gpointer data)
{
selected_type = get_type_from_string ((const gchar *) data);
}
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