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gimp/plug-ins/common/png.c

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/*
* "$Id$"
*
* Portable Network Graphics (PNG) plug-in for The GIMP -- an image
* manipulation program
*
* Copyright 1997-1998 Michael Sweet (mike@easysw.com) and
* Daniel Skarda (0rfelyus@atrey.karlin.mff.cuni.cz).
* and 1999-2000 Nick Lamb (njl195@zepler.org.uk)
*
* 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.
*
* Contents:
*
* main() - Main entry - just call gimp_main()...
* query() - Respond to a plug-in query...
* run() - Run the plug-in...
* load_image() - Load a PNG image into a new image window.
* respin_cmap() - Re-order a Gimp colormap for PNG tRNS
* save_image() - Save the specified image to a PNG file.
* save_compression_callback() - Update the image compression level.
* save_interlace_update() - Update the interlacing option.
* save_dialog() - Pop up the save dialog.
*
* Revision History:
*
* see ChangeLog
*/
#include "config.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include <png.h> /* PNG library definitions */
#include "libgimp/stdplugins-intl.h"
/*
* Constants...
*/
#define PLUG_IN_VERSION "1.3.4 - 03 September 2002"
#define SCALE_WIDTH 125
#define DEFAULT_GAMMA 2.20
#define RESPONSE_LOAD_DEFAULTS 1
#define RESPONSE_SAVE_DEFAULTS 2
#define PNG_DEFAULTS_PARASITE "png-save-defaults"
/*
* Structures...
*/
typedef struct
{
gboolean interlaced;
gboolean bkgd;
gboolean gama;
gboolean offs;
gboolean phys;
gboolean time;
gboolean comment;
gboolean save_transp_pixels;
gint compression_level;
}
PngSaveVals;
typedef struct
{
gboolean run;
GtkWidget *interlaced;
GtkWidget *bkgd;
GtkWidget *gama;
GtkWidget *offs;
GtkWidget *phys;
GtkWidget *time;
GtkWidget *comment;
GtkWidget *save_transp_pixels;
GtkObject *compression_level;
}
PngSaveGui;
/*
* Local functions...
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gint32 load_image (const gchar *filename,
gboolean interactive);
static gint save_image (const gchar *filename,
gint32 image_ID,
gint32 drawable_ID,
gint32 orig_image_ID);
static void respin_cmap (png_structp pp,
png_infop info,
guchar *remap,
gint32 image_ID,
GimpDrawable *drawable);
static gboolean save_dialog (gint32 image_ID,
gboolean alpha);
static void save_dialog_response (GtkWidget *widget,
gint response_id,
gpointer data);
static gboolean ia_has_transparent_pixels (guchar *pixels,
gint numpixels);
static int find_unused_ia_colour (guchar *pixels,
gint numpixels,
gint *colors);
static gboolean load_defaults (void);
static void save_defaults (void);
static void load_gui_defaults (PngSaveGui *pg);
/*
* Globals...
*/
GimpPlugInInfo PLUG_IN_INFO =
{
NULL,
NULL,
query,
run
};
PngSaveVals pngvals =
{
FALSE,
TRUE,
FALSE,
FALSE,
TRUE,
TRUE,
TRUE,
TRUE,
9
};
/*
* 'main()' - Main entry - just call gimp_main()...
*/
MAIN ()
/*
* 'query()' - Respond to a plug-in query...
*/
static void
query (void)
{
static GimpParamDef load_args[] = {
{GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive"},
{GIMP_PDB_STRING, "filename", "The name of the file to load"},
{GIMP_PDB_STRING, "raw_filename", "The name of the file to load"}
};
static GimpParamDef load_return_vals[] = {
{GIMP_PDB_IMAGE, "image", "Output image"}
};
#define COMMON_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 of the file to save the image in"}
#define OLD_CONFIG_ARGS \
{GIMP_PDB_INT32, "interlace", "Use Adam7 interlacing?"}, \
{GIMP_PDB_INT32, "compression", "Deflate Compression factor (0--9)"}, \
{GIMP_PDB_INT32, "bkgd", "Write bKGD chunk?"}, \
{GIMP_PDB_INT32, "gama", "Write gAMA chunk?"}, \
{GIMP_PDB_INT32, "offs", "Write oFFs chunk?"}, \
{GIMP_PDB_INT32, "phys", "Write pHYs chunk?"}, \
{GIMP_PDB_INT32, "time", "Write tIME chunk?"}
#define FULL_CONFIG_ARGS \
OLD_CONFIG_ARGS, \
{GIMP_PDB_INT32, "comment", "Write comment?"}, \
{GIMP_PDB_INT32, "svtrans", "Preserve color of transparent pixels?"}
static GimpParamDef save_args[] = {
COMMON_SAVE_ARGS,
OLD_CONFIG_ARGS
};
static GimpParamDef save_args2[] = {
COMMON_SAVE_ARGS,
FULL_CONFIG_ARGS
};
static GimpParamDef save_args_defaults[] = {
COMMON_SAVE_ARGS
};
static GimpParamDef save_get_defaults_return_vals[] = {
FULL_CONFIG_ARGS
};
static GimpParamDef save_args_set_defaults[] = {
FULL_CONFIG_ARGS
};
gimp_install_procedure ("file_png_load",
"Loads files in PNG file format",
"This plug-in loads Portable Network Graphics (PNG) files.",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>, Nick Lamb <njl195@zepler.org.uk>",
PLUG_IN_VERSION,
N_("PNG image"),
NULL,
GIMP_PLUGIN,
G_N_ELEMENTS (load_args),
G_N_ELEMENTS (load_return_vals),
load_args, load_return_vals);
gimp_register_file_handler_mime ("file_png_load", "image/png");
gimp_register_magic_load_handler ("file_png_load",
"png", "", "0,string,\211PNG\r\n\032\n");
gimp_install_procedure ("file_png_save",
"Saves files in PNG file format",
"This plug-in saves Portable Network Graphics (PNG) files.",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>, Nick Lamb <njl195@zepler.org.uk>",
PLUG_IN_VERSION,
N_("PNG image"),
"RGB*,GRAY*,INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (save_args), 0,
save_args, NULL);
gimp_register_file_handler_mime ("file_png_save", "image/png");
gimp_install_procedure ("file_png_save2",
"Saves files in PNG file format",
"This plug-in saves Portable Network Graphics (PNG) files. "
"This procedure adds 2 extra parameters to file_png_save that allows to control whether image comments are saved and whether transparent pixels are saved or nullified.",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>, Nick Lamb <njl195@zepler.org.uk>",
PLUG_IN_VERSION,
N_("PNG image"),
"RGB*,GRAY*,INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (save_args2), 0,
save_args2, NULL);
gimp_register_file_handler_mime ("file_png_save2", "image/png");
gimp_install_procedure ("file_png_save_defaults",
"Saves files in PNG file format",
"This plug-in saves Portable Network Graphics (PNG) files, using the default settings stored as a parasite.",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>, Nick Lamb <njl195@zepler.org.uk>",
PLUG_IN_VERSION,
N_("PNG image"),
"RGB*,GRAY*,INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (save_args_defaults), 0,
save_args_defaults, NULL);
gimp_register_file_handler_mime ("file_png_save_defaults", "image/png");
gimp_register_save_handler ("file_png_save_defaults", "png", "");
gimp_install_procedure ("file_png_get_defaults",
"Get the current set of defaults used by the PNG file save plug-in",
"This procedure returns the current set of defaults stored as a parasite for the PNG save plug-in. "
"These defaults are used to seed the UI, by the file_png_save_defaults procedure, and by gimp_file_save when it detects to use PNG.",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>, Nick Lamb <njl195@zepler.org.uk>",
PLUG_IN_VERSION,
NULL,
NULL,
GIMP_PLUGIN,
0, G_N_ELEMENTS (save_get_defaults_return_vals),
NULL, save_get_defaults_return_vals);
gimp_install_procedure ("file_png_set_defaults",
"Set the current set of defaults used by the PNG file save plug-in",
"This procedure set the current set of defaults stored as a parasite for the PNG save plug-in. "
"These defaults are used to seed the UI, by the file_png_save_defaults procedure, and by gimp_file_save when it detects to use PNG.",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>",
"Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>, Nick Lamb <njl195@zepler.org.uk>",
PLUG_IN_VERSION,
NULL,
NULL,
GIMP_PLUGIN,
G_N_ELEMENTS (save_args_set_defaults), 0,
save_args_set_defaults, NULL);
}
/*
* 'run()' - Run the plug-in...
*/
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[10];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
gint32 image_ID;
gint32 drawable_ID;
gint32 orig_image_ID;
GimpExportReturn export = GIMP_EXPORT_CANCEL;
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
if (strcmp (name, "file_png_load") == 0)
{
run_mode = param[0].data.d_int32;
image_ID = load_image (param[1].data.d_string,
run_mode == GIMP_RUN_INTERACTIVE);
if (image_ID != -1)
{
*nreturn_vals = 2;
values[1].type = GIMP_PDB_IMAGE;
values[1].data.d_image = image_ID;
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
}
else if (strcmp (name, "file_png_save") == 0 ||
strcmp (name, "file_png_save2") == 0 ||
strcmp (name, "file_png_save_defaults") == 0)
{
gboolean alpha;
run_mode = param[0].data.d_int32;
image_ID = orig_image_ID = param[1].data.d_int32;
drawable_ID = param[2].data.d_int32;
load_defaults ();
/* eventually export the image */
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
case GIMP_RUN_WITH_LAST_VALS:
gimp_ui_init ("png", FALSE);
export = gimp_export_image (&image_ID, &drawable_ID, "PNG",
(GIMP_EXPORT_CAN_HANDLE_RGB |
GIMP_EXPORT_CAN_HANDLE_GRAY |
GIMP_EXPORT_CAN_HANDLE_INDEXED |
GIMP_EXPORT_CAN_HANDLE_ALPHA));
if (export == GIMP_EXPORT_CANCEL)
{
*nreturn_vals = 1;
values[0].data.d_status = GIMP_PDB_CANCEL;
return;
}
break;
default:
break;
}
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/*
* Possibly retrieve data...
*/
gimp_get_data ("file_png_save", &pngvals);
alpha = gimp_drawable_has_alpha (drawable_ID);
/*
* If the image has no transparency, then there is usually
* no need to save a bKGD chunk. For more information, see:
* http://bugzilla.gnome.org/show_bug.cgi?id=92395
*/
if (! alpha)
pngvals.bkgd = FALSE;
/*
* Then acquire information with a dialog...
*/
if (! save_dialog (orig_image_ID, alpha))
status = GIMP_PDB_CANCEL;
break;
case GIMP_RUN_NONINTERACTIVE:
/*
* Make sure all the arguments are there!
*/
if (nparams != 5)
{
if (nparams != 12 && nparams != 14)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
pngvals.interlaced = param[5].data.d_int32;
pngvals.compression_level = param[6].data.d_int32;
pngvals.bkgd = param[7].data.d_int32;
pngvals.gama = param[8].data.d_int32;
pngvals.offs = param[9].data.d_int32;
pngvals.phys = param[10].data.d_int32;
pngvals.time = param[11].data.d_int32;
if (nparams == 14)
{
pngvals.comment = param[12].data.d_int32;
pngvals.save_transp_pixels = param[13].data.d_int32;
}
else
{
pngvals.comment = TRUE;
pngvals.save_transp_pixels = TRUE;
}
if (pngvals.compression_level < 0 ||
pngvals.compression_level > 9)
status = GIMP_PDB_CALLING_ERROR;
}
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/*
* Possibly retrieve data...
*/
gimp_get_data ("file_png_save", &pngvals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
if (save_image (param[3].data.d_string,
image_ID, drawable_ID, orig_image_ID))
{
gimp_set_data ("file_png_save", &pngvals, sizeof (pngvals));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
}
if (export == GIMP_EXPORT_EXPORT)
gimp_image_delete (image_ID);
}
else if (strcmp (name, "file_png_get_defaults") == 0)
{
load_defaults ();
*nreturn_vals = 9;
#define SET_VALUE(index, field) G_STMT_START { \
values[(index)].type = GIMP_PDB_INT32; \
values[(index)].data.d_int32 = pngvals.field; \
} G_STMT_END
SET_VALUE (1, interlaced);
SET_VALUE (2, compression_level);
SET_VALUE (3, bkgd);
SET_VALUE (4, gama);
SET_VALUE (5, offs);
SET_VALUE (6, phys);
SET_VALUE (7, time);
SET_VALUE (8, comment);
SET_VALUE (9, save_transp_pixels);
#undef SET_VALUE
}
else if (strcmp (name, "file_png_set_defaults") == 0)
{
if (nparams == 10)
{
pngvals.interlaced = param[1].data.d_int32;
pngvals.compression_level = param[2].data.d_int32;
pngvals.bkgd = param[3].data.d_int32;
pngvals.gama = param[4].data.d_int32;
pngvals.offs = param[5].data.d_int32;
pngvals.phys = param[6].data.d_int32;
pngvals.time = param[7].data.d_int32;
pngvals.comment = param[8].data.d_int32;
pngvals.save_transp_pixels = param[9].data.d_int32;
save_defaults ();
}
else
status = GIMP_PDB_CALLING_ERROR;
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
}
/* Try to find a colour in the palette which isn't actually
* used in the image, so that we can use it as the transparency
* index. Taken from gif.c */
static gint
find_unused_ia_colour (guchar *pixels,
gint numpixels,
gint *colors)
{
gint i;
gboolean ix_used[256];
gboolean trans_used = FALSE;
for (i = 0; i < *colors; i++)
{
ix_used[i] = FALSE;
}
for (i = 0; i < numpixels; i++)
{
/* If alpha is over a threshold, the colour index in the
* palette is taken. Otherwise, this pixel is transparent. */
if (pixels[i * 2 + 1] > 127)
ix_used[pixels[i * 2]] = TRUE;
else
trans_used = TRUE;
}
/* If there is no transparency, ignore alpha. */
if (trans_used == FALSE)
return -1;
for (i = 0; i < *colors; i++)
{
if (ix_used[i] == FALSE)
{
return i;
}
}
/* Couldn't find an unused colour index within the number of
bits per pixel we wanted. Will have to increment the number
of colours in the image and assign a transparent pixel there. */
if ((*colors) < 256)
{
(*colors)++;
return ((*colors) - 1);
}
return (-1);
}
/*
* 'load_image()' - Load a PNG image into a new image window.
*/
static gint32
load_image (const gchar *filename,
gboolean interactive)
{
int i, /* Looping var */
trns, /* Transparency present */
bpp, /* Bytes per pixel */
image_type, /* Type of image */
layer_type, /* Type of drawable/layer */
empty, /* Number of fully transparent indices */
num_passes, /* Number of interlace passes in file */
pass, /* Current pass in file */
tile_height, /* Height of tile in GIMP */
begin, /* Beginning tile row */
end, /* Ending tile row */
num; /* Number of rows to load */
FILE *fp; /* File pointer */
volatile gint32 image; /* Image -- preserved against setjmp() */
gint32 layer; /* Layer */
GimpDrawable *drawable; /* Drawable for layer */
GimpPixelRgn pixel_rgn; /* Pixel region for layer */
png_structp pp; /* PNG read pointer */
png_infop info; /* PNG info pointers */
guchar **pixels, /* Pixel rows */
*pixel; /* Pixel data */
gchar *progress; /* Title for progress display... */
guchar alpha[256], /* Index -> Alpha */
*alpha_ptr; /* Temporary pointer */
png_textp text;
gint num_texts;
/*
* PNG 0.89 and newer have a sane, forwards compatible constructor.
* Some SGI IRIX users will not have a new enough version though
*/
#if PNG_LIBPNG_VER > 88
pp = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info = png_create_info_struct (pp);
#else
pp = (png_structp) calloc (sizeof (png_struct), 1);
png_read_init (pp);
info = (png_infop) calloc (sizeof (png_info), 1);
#endif /* PNG_LIBPNG_VER > 88 */
if (setjmp (pp->jmpbuf))
{
g_message (_("Error while reading '%s'. File corrupted?"),
gimp_filename_to_utf8 (filename));
return image;
}
/* initialise image here, thus avoiding compiler warnings */
image = -1;
/*
* Open the file and initialize the PNG read "engine"...
*/
fp = fopen (filename, "rb");
if (fp == NULL)
{
g_message (_("Could not open '%s' for reading: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
gimp_quit ();
}
png_init_io (pp, fp);
progress = g_strdup_printf (_("Opening '%s'..."),
gimp_filename_to_utf8 (filename));
gimp_progress_init (progress);
g_free (progress);
/*
* Get the image dimensions and create the image...
*/
png_read_info (pp, info);
/*
* Latest attempt, this should be my best yet :)
*/
if (info->bit_depth == 16)
{
png_set_strip_16 (pp);
}
if (info->color_type == PNG_COLOR_TYPE_GRAY && info->bit_depth < 8)
{
png_set_expand (pp);
}
if (info->color_type == PNG_COLOR_TYPE_PALETTE && info->bit_depth < 8)
{
png_set_packing (pp);
}
/*
* Expand G+tRNS to GA, RGB+tRNS to RGBA
*/
if (info->color_type != PNG_COLOR_TYPE_PALETTE &&
(info->valid & PNG_INFO_tRNS))
{
png_set_expand (pp);
}
/*
* Turn on interlace handling... libpng returns just 1 (ie single pass)
* if the image is not interlaced
*/
num_passes = png_set_interlace_handling (pp);
/*
* Special handling for INDEXED + tRNS (transparency palette)
*/
#if PNG_LIBPNG_VER > 99
if (png_get_valid (pp, info, PNG_INFO_tRNS) &&
info->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_get_tRNS (pp, info, &alpha_ptr, &num, NULL);
/* Copy the existing alpha values from the tRNS chunk */
for (i = 0; i < num; ++i)
alpha[i] = alpha_ptr[i];
/* And set any others to fully opaque (255) */
for (i = num; i < 256; ++i)
alpha[i] = 255;
trns = 1;
}
else
{
trns = 0;
}
#else
trns = 0;
#endif /* PNG_LIBPNG_VER > 99 */
/*
* Update the info structures after the transformations take effect
*/
png_read_update_info (pp, info);
switch (info->color_type)
{
case PNG_COLOR_TYPE_RGB: /* RGB */
bpp = 3;
image_type = GIMP_RGB;
layer_type = GIMP_RGB_IMAGE;
break;
case PNG_COLOR_TYPE_RGB_ALPHA: /* RGBA */
bpp = 4;
image_type = GIMP_RGB;
layer_type = GIMP_RGBA_IMAGE;
break;
case PNG_COLOR_TYPE_GRAY: /* Grayscale */
bpp = 1;
image_type = GIMP_GRAY;
layer_type = GIMP_GRAY_IMAGE;
break;
case PNG_COLOR_TYPE_GRAY_ALPHA: /* Grayscale + alpha */
bpp = 2;
image_type = GIMP_GRAY;
layer_type = GIMP_GRAYA_IMAGE;
break;
case PNG_COLOR_TYPE_PALETTE: /* Indexed */
bpp = 1;
image_type = GIMP_INDEXED;
layer_type = GIMP_INDEXED_IMAGE;
break;
default: /* Aie! Unknown type */
g_message (_("Unknown color model in PNG file '%s'."),
gimp_filename_to_utf8 (filename));
return -1;
};
image = gimp_image_new (info->width, info->height, image_type);
if (image == -1)
{
g_message ("Could not create new image for '%s'",
gimp_filename_to_utf8 (filename));
gimp_quit ();
};
/*
* Create the "background" layer to hold the image...
*/
layer = gimp_layer_new (image, _("Background"), info->width, info->height,
layer_type, 100, GIMP_NORMAL_MODE);
gimp_image_add_layer (image, layer, 0);
/*
* Find out everything we can about the image resolution
* This is only practical with the new 1.0 APIs, I'm afraid
* due to a bug in libpng-1.0.6, see png-implement for details
*/
#if PNG_LIBPNG_VER > 99
if (png_get_valid (pp, info, PNG_INFO_gAMA))
{
GimpParasite *parasite;
gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
gdouble gamma;
png_get_gAMA (pp, info, &gamma);
g_ascii_dtostr (buf, sizeof (buf), gamma);
parasite = gimp_parasite_new ("gamma",
GIMP_PARASITE_PERSISTENT,
strlen (buf) + 1, buf);
gimp_image_parasite_attach (image, parasite);
gimp_parasite_free (parasite);
}
if (png_get_valid (pp, info, PNG_INFO_oFFs))
{
gint offset_x = png_get_x_offset_pixels (pp, info);
gint offset_y = png_get_y_offset_pixels (pp, info);
gimp_layer_set_offsets (layer, offset_x, offset_y);
if ((abs (offset_x) > info->width) || (abs (offset_y) > info->height))
{
if (interactive)
g_message (_("The PNG file specifies an offset that caused "
"the layer to be positioned outside the image."));
}
}
if (png_get_valid (pp, info, PNG_INFO_pHYs))
{
png_uint_32 xres;
png_uint_32 yres;
gint unit_type;
if (png_get_pHYs (pp, info, &xres, &yres, &unit_type))
{
switch (unit_type)
{
case PNG_RESOLUTION_UNKNOWN:
{
gdouble image_xres, image_yres;
gimp_image_get_resolution (image, &image_xres, &image_yres);
if (xres > yres)
image_xres = image_yres * (gdouble) xres / (gdouble) yres;
else
image_yres = image_xres * (gdouble) yres / (gdouble) xres;
gimp_image_set_resolution (image, image_xres, image_yres);
}
break;
case PNG_RESOLUTION_METER:
gimp_image_set_resolution (image,
(gdouble) xres * 0.0254,
(gdouble) yres * 0.0254);
break;
default:
break;
}
}
}
#endif /* PNG_LIBPNG_VER > 99 */
gimp_image_set_filename (image, filename);
/*
* Load the colormap as necessary...
*/
empty = 0; /* by default assume no full transparent palette entries */
if (info->color_type & PNG_COLOR_MASK_PALETTE)
{
#if PNG_LIBPNG_VER > 99
if (png_get_valid (pp, info, PNG_INFO_tRNS))
{
for (empty = 0; empty < 256 && alpha[empty] == 0; ++empty)
/* Calculates number of fully transparent "empty" entries */;
/* keep at least one entry */
empty = MIN (empty, info->num_palette - 1);
gimp_image_set_colormap (image, (guchar *) (info->palette + empty),
info->num_palette - empty);
}
else
{
gimp_image_set_colormap (image, (guchar *) info->palette,
info->num_palette);
}
#else
gimp_image_set_colormap (image, (guchar *) info->palette,
info->num_palette);
#endif /* PNG_LIBPNG_VER > 99 */
}
/*
* Get the drawable and set the pixel region for our load...
*/
drawable = gimp_drawable_get (layer);
gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0, drawable->width,
drawable->height, TRUE, FALSE);
/*
* Temporary buffer...
*/
tile_height = gimp_tile_height ();
pixel = g_new (guchar, tile_height * info->width * bpp);
pixels = g_new (guchar *, tile_height);
for (i = 0; i < tile_height; i++)
pixels[i] = pixel + info->width * info->channels * i;
for (pass = 0; pass < num_passes; pass++)
{
/*
* This works if you are only reading one row at a time...
*/
for (begin = 0, end = tile_height;
begin < info->height; begin += tile_height, end += tile_height)
{
if (end > info->height)
end = info->height;
num = end - begin;
if (pass != 0) /* to handle interlaced PiNGs */
gimp_pixel_rgn_get_rect (&pixel_rgn, pixel, 0, begin,
drawable->width, num);
png_read_rows (pp, pixels, NULL, num);
gimp_pixel_rgn_set_rect (&pixel_rgn, pixel, 0, begin,
drawable->width, num);
gimp_progress_update (((double) pass +
(double) end / (double) info->height) /
(double) num_passes);
};
};
png_read_end (pp, info);
if (png_get_text (pp, info, &text, &num_texts))
{
gchar *comment = NULL;
for (i = 0; i < num_texts && !comment; i++)
{
if (text->key == NULL || strcmp (text->key, "Comment"))
continue;
if (text->text_length > 0) /* tEXt */
{
comment = g_convert (text->text, -1,
"UTF-8", "ISO-8859-1",
NULL, NULL, NULL);
}
else if (g_utf8_validate (text->text, -1, NULL))
{ /* iTXt */
comment = g_strdup (text->text);
}
}
if (comment && *comment)
{
GimpParasite *parasite;
parasite = gimp_parasite_new ("gimp-comment",
GIMP_PARASITE_PERSISTENT,
strlen (comment) + 1, comment);
gimp_image_parasite_attach (image, parasite);
gimp_parasite_free (parasite);
}
g_free (comment);
}
/*
* Done with the file...
*/
png_read_destroy (pp, info, NULL);
g_free (pixel);
g_free (pixels);
free (pp);
free (info);
fclose (fp);
if (trns)
{
gimp_layer_add_alpha (layer);
drawable = gimp_drawable_get (layer);
gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0, drawable->width,
drawable->height, TRUE, FALSE);
pixel = g_new (guchar, tile_height * drawable->width * 2); /* bpp == 1 */
for (begin = 0, end = tile_height;
begin < drawable->height; begin += tile_height, end += tile_height)
{
if (end > drawable->height)
end = drawable->height;
num = end - begin;
gimp_pixel_rgn_get_rect (&pixel_rgn, pixel, 0, begin,
drawable->width, num);
for (i = 0; i < tile_height * drawable->width; ++i)
{
pixel[i * 2 + 1] = alpha[pixel[i * 2]];
pixel[i * 2] -= empty;
}
gimp_pixel_rgn_set_rect (&pixel_rgn, pixel, 0, begin,
drawable->width, num);
}
g_free (pixel);
}
/*
* Update the display...
*/
gimp_drawable_flush (drawable);
gimp_drawable_detach (drawable);
return (image);
}
/*
* 'save_image ()' - Save the specified image to a PNG file.
*/
static gint
save_image (const gchar *filename,
gint32 image_ID,
gint32 drawable_ID,
gint32 orig_image_ID)
{
int i, k, /* Looping vars */
bpp = 0, /* Bytes per pixel */
type, /* Type of drawable/layer */
num_passes, /* Number of interlace passes in file */
pass, /* Current pass in file */
tile_height, /* Height of tile in GIMP */
begin, /* Beginning tile row */
end, /* Ending tile row */
num; /* Number of rows to load */
FILE *fp; /* File pointer */
GimpDrawable *drawable; /* Drawable for layer */
GimpPixelRgn pixel_rgn; /* Pixel region for layer */
png_structp pp; /* PNG read pointer */
png_infop info; /* PNG info pointer */
gint num_colors; /* Number of colors in colormap */
gint offx, offy; /* Drawable offsets from origin */
guchar **pixels, /* Pixel rows */
*fixed, /* Fixed-up pixel data */
*pixel; /* Pixel data */
gchar *progress; /* Title for progress display... */
gdouble xres, yres; /* GIMP resolution (dpi) */
png_color_16 background; /* Background color */
png_time mod_time; /* Modification time (ie NOW) */
guchar red, green, blue; /* Used for palette background */
time_t cutime; /* Time since epoch */
struct tm *gmt; /* GMT broken down */
guchar remap[256]; /* Re-mapping for the palette */
png_textp text = NULL;
if (pngvals.comment)
{
GimpParasite *parasite;
parasite = gimp_image_parasite_find (orig_image_ID, "gimp-comment");
if (parasite)
{
gchar *comment = g_strndup (gimp_parasite_data (parasite),
gimp_parasite_data_size (parasite));
gimp_parasite_free (parasite);
text = g_new0 (png_text, 1);
text->key = "Comment";
#ifdef PNG_iTXt_SUPPORTED
text->compression = PNG_ITXT_COMPRESSION_NONE;
text->text = comment;
text->itxt_length = strlen (comment);
#else
text->compression = PNG_TEXT_COMPRESSION_NONE;
text->text = g_convert (comment, -1,
"ISO-8859-1", "UTF-8",
NULL, &text->text_length,
NULL);
#endif
if (!text->text)
{
g_free (text);
text = NULL;
}
}
}
/*
* PNG 0.89 and newer have a sane, forwards compatible constructor.
* Some SGI IRIX users will not have a new enough version though
*/
#if PNG_LIBPNG_VER > 88
pp = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info = png_create_info_struct (pp);
#else
pp = (png_structp) calloc (sizeof (png_struct), 1);
png_write_init (pp);
info = (png_infop) calloc (sizeof (png_info), 1);
#endif /* PNG_LIBPNG_VER > 88 */
if (setjmp (pp->jmpbuf))
{
g_message (_("Error while saving '%s'. Could not save image."),
gimp_filename_to_utf8 (filename));
return 0;
}
if (text)
png_set_text (pp, info, text, 1);
/*
* Open the file and initialize the PNG write "engine"...
*/
fp = fopen (filename, "wb");
if (fp == NULL)
{
g_message (_("Could not open '%s' for writing: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
return 0;
}
png_init_io (pp, fp);
progress = g_strdup_printf (_("Saving '%s'..."),
gimp_filename_to_utf8 (filename));
gimp_progress_init (progress);
g_free (progress);
/*
* Get the drawable for the current image...
*/
drawable = gimp_drawable_get (drawable_ID);
type = gimp_drawable_type (drawable_ID);
/*
* Set the image dimensions, bit depth, interlacing and compression
*/
png_set_compression_level (pp, pngvals.compression_level);
info->width = drawable->width;
info->height = drawable->height;
info->bit_depth = 8;
info->interlace_type = pngvals.interlaced;
/*
* Initialise remap[]
*/
for (i = 0; i < 256; i++)
remap[i] = i;
/*
* Set color type and remember bytes per pixel count
*/
switch (type)
{
case GIMP_RGB_IMAGE:
info->color_type = PNG_COLOR_TYPE_RGB;
bpp = 3;
break;
case GIMP_RGBA_IMAGE:
info->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
bpp = 4;
break;
case GIMP_GRAY_IMAGE:
info->color_type = PNG_COLOR_TYPE_GRAY;
bpp = 1;
break;
case GIMP_GRAYA_IMAGE:
info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
bpp = 2;
break;
case GIMP_INDEXED_IMAGE:
bpp = 1;
info->color_type = PNG_COLOR_TYPE_PALETTE;
info->valid |= PNG_INFO_PLTE;
info->palette =
(png_colorp) gimp_image_get_colormap (image_ID, &num_colors);
info->num_palette = num_colors;
break;
case GIMP_INDEXEDA_IMAGE:
bpp = 2;
info->color_type = PNG_COLOR_TYPE_PALETTE;
/* fix up transparency */
respin_cmap (pp, info, remap, image_ID, drawable);
break;
default:
g_message ("Image type can't be saved as PNG");
return 0;
};
/*
* Fix bit depths for (possibly) smaller colormap images
*/
if (info->valid & PNG_INFO_PLTE)
{
if (info->num_palette <= 2)
info->bit_depth = 1;
else if (info->num_palette <= 4)
info->bit_depth = 2;
else if (info->num_palette <= 16)
info->bit_depth = 4;
/* otherwise the default is fine */
}
/* All this stuff is optional extras, if the user is aiming for smallest
possible file size she can turn them all off */
#if PNG_LIBPNG_VER > 99
if (pngvals.bkgd)
{
GimpRGB color;
gimp_context_get_background (&color);
gimp_rgb_get_uchar (&color, &red, &green, &blue);
background.index = 0;
background.red = red;
background.green = green;
background.blue = blue;
background.gray = gimp_rgb_intensity_uchar (&color);
png_set_bKGD (pp, info, &background);
}
else
{
/* used to save_transp_pixels */
red = green = blue = 0;
}
if (pngvals.gama)
{
GimpParasite *parasite;
gdouble gamma = 1.0 / DEFAULT_GAMMA;
parasite = gimp_image_parasite_find (orig_image_ID, "gamma");
if (parasite)
{
gamma = g_ascii_strtod (gimp_parasite_data (parasite), NULL);
gimp_parasite_free (parasite);
}
png_set_gAMA (pp, info, gamma);
}
if (pngvals.offs)
{
gimp_drawable_offsets (drawable_ID, &offx, &offy);
if (offx != 0 || offy != 0)
{
png_set_oFFs (pp, info, offx, offy, PNG_OFFSET_PIXEL);
}
}
if (pngvals.phys)
{
gimp_image_get_resolution (orig_image_ID, &xres, &yres);
png_set_pHYs (pp, info, RINT (xres / 0.0254), RINT (yres / 0.0254),
PNG_RESOLUTION_METER);
}
if (pngvals.time)
{
cutime = time (NULL); /* time right NOW */
gmt = gmtime (&cutime);
mod_time.year = gmt->tm_year + 1900;
mod_time.month = gmt->tm_mon + 1;
mod_time.day = gmt->tm_mday;
mod_time.hour = gmt->tm_hour;
mod_time.minute = gmt->tm_min;
mod_time.second = gmt->tm_sec;
png_set_tIME (pp, info, &mod_time);
}
#endif /* PNG_LIBPNG_VER > 99 */
png_write_info (pp, info);
/*
* Turn on interlace handling...
*/
if (pngvals.interlaced)
num_passes = png_set_interlace_handling (pp);
else
num_passes = 1;
/*
* Convert unpacked pixels to packed if necessary
*/
if (info->color_type == PNG_COLOR_TYPE_PALETTE && info->bit_depth < 8)
png_set_packing (pp);
/*
* Allocate memory for "tile_height" rows and save the image...
*/
tile_height = gimp_tile_height ();
pixel = g_new (guchar, tile_height * drawable->width * bpp);
pixels = g_new (guchar *, tile_height);
for (i = 0; i < tile_height; i++)
pixels[i] = pixel + drawable->width * bpp * i;
gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0, drawable->width,
drawable->height, FALSE, FALSE);
for (pass = 0; pass < num_passes; pass++)
{
/* This works if you are only writing one row at a time... */
for (begin = 0, end = tile_height;
begin < drawable->height; begin += tile_height, end += tile_height)
{
if (end > drawable->height)
end = drawable->height;
num = end - begin;
gimp_pixel_rgn_get_rect (&pixel_rgn, pixel, 0, begin,
drawable->width, num);
/*if we are with a RGBA image and have to pre-multiply the alpha channel */
if (bpp == 4 && ! pngvals.save_transp_pixels)
{
for (i = 0; i < num; ++i)
{
fixed = pixels[i];
for (k = 0; k < drawable->width; ++k)
{
int aux;
aux = k << 2;
if (! fixed[aux + 3])
{
fixed[aux] = red;
fixed[aux + 1] = green;
fixed[aux + 2] = blue;
}
}
}
}
/* If we're dealing with a paletted image with
* transparency set, write out the remapped palette */
if (info->valid & PNG_INFO_tRNS)
{
for (i = 0; i < num; ++i)
{
fixed = pixels[i];
for (k = 0; k < drawable->width; ++k)
{
fixed[k] = (fixed[k*2+1] > 127) ?
remap[fixed[k*2]] :
0;
}
}
}
/* Otherwise if we have a paletted image and transparency
* couldn't be set, we ignore the alpha channel */
else if (info->valid & PNG_INFO_PLTE && bpp == 2)
{
for (i = 0; i < num; ++i)
{
fixed = pixels[i];
for (k = 0; k < drawable->width; ++k)
{
fixed[k] = fixed[k * 2];
}
}
}
png_write_rows (pp, pixels, num);
gimp_progress_update (((double) pass + (double) end /
(double) info->height) /
(double) num_passes);
};
};
png_write_end (pp, info);
png_write_destroy (pp);
g_free (pixel);
g_free (pixels);
/*
* Done with the file...
*/
if (text)
{
g_free (text->text);
g_free (text);
}
free (pp);
free (info);
fclose (fp);
return (1);
}
static gboolean
ia_has_transparent_pixels (guchar *pixels,
gint numpixels)
{
while (numpixels --)
{
if (pixels [1] <= 127)
return TRUE;
pixels += 2;
}
return FALSE;
}
static void
respin_cmap (png_structp pp,
png_infop info,
guchar * remap,
gint32 image_ID,
GimpDrawable * drawable)
{
static const guchar trans[] = { 0 };
gint colors;
guchar *before;
gint transparent;
gint cols, rows;
GimpPixelRgn pixel_rgn;
guchar *pixels;
gint numpixels;
before = gimp_image_get_colormap (image_ID, &colors);
/*
* Make sure there is something in the colormap.
*/
if (colors == 0)
{
before = g_new0 (guchar, 3);
colors = 1;
}
cols = drawable->width;
rows = drawable->height;
numpixels = cols * rows;
gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0,
drawable->width, drawable->height, FALSE, FALSE);
pixels = (guchar *) g_malloc (numpixels * 2);
gimp_pixel_rgn_get_rect (&pixel_rgn, pixels, 0, 0,
drawable->width, drawable->height);
/* Try to find an entry which isn't actually used in the
image, for a transparency index. */
#if PNG_LIBPNG_VER > 99
if (ia_has_transparent_pixels (pixels, numpixels))
{
transparent = find_unused_ia_colour (pixels, numpixels, &colors);
if (transparent != -1) /* we have a winner for a transparent
* index - do like gif2png and swap
* index 0 and index transparent */
{
png_color palette[256];
gint i;
png_set_tRNS (pp, info, (png_bytep) trans, 1, NULL);
/* Transform all pixels with a value = transparent to
* 0 and vice versa to compensate for re-ordering in palette
* due to png_set_tRNS() */
remap[0] = transparent;
remap[transparent] = 0;
/* Copy from index 0 to index transparent - 1 to index 1 to
* transparent of after, then from transparent+1 to colors-1
* unchanged, and finally from index transparent to index 0. */
for (i = 0; i < colors; i++)
{
palette[i].red = before[3 * remap[i]];
palette[i].green = before[3 * remap[i] + 1];
palette[i].blue = before[3 * remap[i] + 2];
}
png_set_PLTE (pp, info, palette, colors);
}
else
{
/* Inform the user that we couldn't losslessly save the
* transparency & just use the full palette */
g_message (_("Couldn't losslessly save transparency, "
"saving opacity instead."));
png_set_PLTE (pp, info, (png_colorp) before, colors);
}
}
else
png_set_PLTE (pp, info, (png_colorp) before, colors);
#else
info->valid |= PNG_INFO_PLTE;
info->palette = (png_colorp) before;
info->num_palette = colors;
#endif /* PNG_LIBPNG_VER > 99 */
g_free (pixels);
}
static gboolean
save_dialog (gint32 image_ID,
gboolean alpha)
{
PngSaveGui pg;
GtkWidget *dlg;
GtkWidget *table;
GtkWidget *toggle;
GtkObject *scale;
GimpParasite *parasite;
dlg = gimp_dialog_new (_("Save as PNG"), "png",
NULL, 0,
gimp_standard_help_func, "file-png-save-defaults",
_("_Load defaults"), RESPONSE_LOAD_DEFAULTS,
_("_Save defaults"), RESPONSE_SAVE_DEFAULTS,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
g_signal_connect (dlg, "response",
G_CALLBACK (save_dialog_response),
&pg);
g_signal_connect (dlg, "destroy",
G_CALLBACK (gtk_main_quit),
NULL);
table = gtk_table_new (9, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_container_set_border_width (GTK_CONTAINER (table), 12);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), table, TRUE, TRUE, 0);
gtk_widget_show (table);
pg.interlaced = toggle =
gtk_check_button_new_with_mnemonic (_("_Interlacing (Adam7)"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 0, 1, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
pngvals.interlaced);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&pngvals.interlaced);
pg.bkgd = toggle =
gtk_check_button_new_with_mnemonic (_("Save _background color"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 1, 2, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pngvals.bkgd);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update), &pngvals.bkgd);
pg.gama = toggle = gtk_check_button_new_with_mnemonic (_("Save _gamma"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 2, 3, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pngvals.gama);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update), &pngvals.gama);
pg.offs = toggle =
gtk_check_button_new_with_mnemonic (_("Save layer o_ffset"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 3, 4, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pngvals.offs);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&pngvals.offs);
pg.phys = toggle = gtk_check_button_new_with_mnemonic (_("Save _resolution"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 4, 5, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pngvals.phys);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update), &pngvals.phys);
pg.time = toggle =
gtk_check_button_new_with_mnemonic (_("Save creation _time"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 5, 6, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pngvals.time);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update), &pngvals.time);
pg.comment = toggle = gtk_check_button_new_with_mnemonic (_("Save comme_nt"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 6, 7, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), pngvals.comment);
gtk_widget_show (toggle);
parasite = gimp_image_parasite_find (image_ID, "gimp-comment");
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
pngvals.comment && parasite != NULL);
gtk_widget_set_sensitive (toggle, parasite != NULL);
gimp_parasite_free (parasite);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update), &pngvals.comment);
pg.save_transp_pixels = toggle =
gtk_check_button_new_with_mnemonic (_("Save color _values from transparent pixels"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 7, 8, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
alpha && pngvals.save_transp_pixels);
gtk_widget_set_sensitive (toggle, alpha);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&pngvals.save_transp_pixels);
pg.compression_level = scale =
gimp_scale_entry_new (GTK_TABLE (table), 0, 8,
_("Co_mpression level:"),
SCALE_WIDTH, 0,
pngvals.compression_level,
0.0, 9.0, 1.0, 1.0, 0, TRUE, 0.0, 0.0,
_("Choose a high compression level "
"for small file size"), NULL);
g_signal_connect (scale, "value_changed",
G_CALLBACK (gimp_int_adjustment_update),
&pngvals.compression_level);
gtk_widget_show (dlg);
pg.run = FALSE;
gtk_main ();
return pg.run;
}
static void
save_dialog_response (GtkWidget *widget,
gint response_id,
gpointer data)
{
PngSaveGui *pg = data;
switch (response_id)
{
case RESPONSE_LOAD_DEFAULTS:
load_gui_defaults (pg);
break;
case RESPONSE_SAVE_DEFAULTS:
save_defaults ();
break;
case GTK_RESPONSE_OK:
pg->run = TRUE;
default:
gtk_widget_destroy (widget);
break;
}
}
static gboolean
load_defaults (void)
{
GimpParasite *parasite;
gchar *def_str;
PngSaveVals tmpvals;
gint num_fields;
parasite = gimp_parasite_find (PNG_DEFAULTS_PARASITE);
if (! parasite)
return FALSE;
def_str = g_strndup (gimp_parasite_data (parasite),
gimp_parasite_data_size (parasite));
gimp_parasite_free (parasite);
num_fields = sscanf (def_str, "%d %d %d %d %d %d %d %d %d",
&tmpvals.interlaced,
&tmpvals.bkgd,
&tmpvals.gama,
&tmpvals.offs,
&tmpvals.phys,
&tmpvals.time,
&tmpvals.comment,
&tmpvals.save_transp_pixels,
&tmpvals.compression_level);
g_free (def_str);
if (num_fields == 9)
{
memcpy (&pngvals, &tmpvals, sizeof (tmpvals));
return TRUE;
}
else
{
return FALSE;
}
}
static void
save_defaults (void)
{
GimpParasite *parasite;
gchar *def_str;
def_str = g_strdup_printf ("%d %d %d %d %d %d %d %d %d",
pngvals.interlaced,
pngvals.bkgd,
pngvals.gama,
pngvals.offs,
pngvals.phys,
pngvals.time,
pngvals.comment,
pngvals.save_transp_pixels,
pngvals.compression_level);
parasite = gimp_parasite_new (PNG_DEFAULTS_PARASITE,
GIMP_PARASITE_PERSISTENT,
strlen (def_str), def_str);
gimp_parasite_attach (parasite);
gimp_parasite_free (parasite);
g_free (def_str);
}
static void
load_gui_defaults (PngSaveGui *pg)
{
if (! load_defaults ())
{
g_message (_("Could not load PNG defaults"));
return;
}
#define SET_ACTIVE(field) \
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (pg->field), pngvals.field)
SET_ACTIVE (interlaced);
SET_ACTIVE (bkgd);
SET_ACTIVE (gama);
SET_ACTIVE (offs);
SET_ACTIVE (phys);
SET_ACTIVE (time);
SET_ACTIVE (comment);
SET_ACTIVE (save_transp_pixels);
#undef SET_ACTIVE
gtk_adjustment_set_value (GTK_ADJUSTMENT (pg->compression_level),
pngvals.compression_level);
}
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