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gimp/libgimp/gimpvectorloadprocedure.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpvectorloadprocedure.c
* Copyright (C) 2024 Jehan
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <math.h>
#include "gimp.h"
#include "libgimpbase/gimpwire.h" /* FIXME kill this include */
#include "gimpvectorloadprocedure.h"
#include "gimppdb_pdb.h"
#include "gimpplugin-private.h"
#include "gimpprocedureconfig-private.h"
#include "libgimp-intl.h"
#define GIMP_VECTOR_LOAD_DEFAULT_PIXEL_DENSITY 300.0
/**
* GimpVectorLoadProcedure:
*
* A [class@Procedure] subclass that makes it easier to write load procedures
* for vector image formats.
*
* It automatically adds the standard arguments:
* ([enum@RunMode], [iface@Gio.File], int width, int height)
*
* and the standard return value: ( [class@Image] )
*
* It is possible to add additional arguments.
*
* When invoked via [method@Procedure.run], it unpacks these standard
* arguments and calls @run_func which is a [callback@RunImageFunc]. The
* [class@ProcedureConfig] of [callback@Gimp.RunVectorLoadFunc] contains
* additionally added arguments but also the arguments added by this class.
*/
struct _GimpVectorLoadProcedure
{
GimpLoadProcedure parent_instance;
GimpRunVectorLoadFunc run_func;
gpointer run_data;
GDestroyNotify run_data_destroy;
GimpExtractVectorFunc extract_func;
gpointer extract_data;
GDestroyNotify extract_data_destroy;
};
static void gimp_vector_load_procedure_constructed (GObject *object);
static void gimp_vector_load_procedure_finalize (GObject *object);
static void gimp_vector_load_procedure_install (GimpProcedure *procedure);
static GimpValueArray * gimp_vector_load_procedure_run (GimpProcedure *procedure,
const GimpValueArray *args);
G_DEFINE_FINAL_TYPE (GimpVectorLoadProcedure, gimp_vector_load_procedure, GIMP_TYPE_LOAD_PROCEDURE)
#define parent_class gimp_vector_load_procedure_parent_class
static void
gimp_vector_load_procedure_class_init (GimpVectorLoadProcedureClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpProcedureClass *procedure_class = GIMP_PROCEDURE_CLASS (klass);
object_class->constructed = gimp_vector_load_procedure_constructed;
object_class->finalize = gimp_vector_load_procedure_finalize;
procedure_class->install = gimp_vector_load_procedure_install;
procedure_class->run = gimp_vector_load_procedure_run;
}
static void
gimp_vector_load_procedure_init (GimpVectorLoadProcedure *procedure)
{
}
static void
gimp_vector_load_procedure_constructed (GObject *object)
{
GimpProcedure *procedure = GIMP_PROCEDURE (object);
G_OBJECT_CLASS (parent_class)->constructed (object);
gimp_procedure_add_int_argument (procedure, "width",
_("_Width (pixels)"),
"Width (in pixels) to load the image in. "
"(0 for the corresponding width per native ratio)",
0, GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE);
gimp_procedure_add_int_argument (procedure, "height",
_("_Height (pixels)"),
"Height (in pixels) to load the image in. "
"(0 for the corresponding height per native ratio)",
0, GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE);
gimp_procedure_add_boolean_argument (procedure, "keep-ratio",
_("_Keep aspect ratio"),
_("Force dimensions with aspect ratio"),
TRUE,
G_PARAM_READWRITE);
gimp_procedure_add_boolean_argument (procedure, "prefer-native-dimensions",
_("_Prefer native dimensions"),
_("Load and use dimensions from source file"),
FALSE,
G_PARAM_READWRITE);
/* Note: the "pixel-density" is saved in pixels per inch. "physical-unit"
* property is only there for display.
*/
gimp_procedure_add_double_aux_argument (procedure, "pixel-density",
_("Resolu_tion"),
_("Pixel Density: number of pixels per physical unit"),
GIMP_MIN_RESOLUTION, GIMP_MAX_RESOLUTION,
GIMP_VECTOR_LOAD_DEFAULT_PIXEL_DENSITY,
G_PARAM_READWRITE);
gimp_procedure_add_int_aux_argument (procedure, "physical-unit",
_("Unit"),
_("Physical unit"),
GIMP_UNIT_INCH, GIMP_UNIT_PICA, GIMP_UNIT_INCH,
G_PARAM_READWRITE);
}
static void
gimp_vector_load_procedure_finalize (GObject *object)
{
GimpVectorLoadProcedure *procedure = GIMP_VECTOR_LOAD_PROCEDURE (object);
if (procedure->run_data_destroy)
procedure->run_data_destroy (procedure->run_data);
if (procedure->extract_data_destroy)
procedure->extract_data_destroy (procedure->extract_data);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_vector_load_procedure_install (GimpProcedure *procedure)
{
GIMP_PROCEDURE_CLASS (parent_class)->install (procedure);
_gimp_pdb_set_file_proc_handles_vector (gimp_procedure_get_name (procedure));
}
static GimpValueArray *
gimp_vector_load_procedure_run (GimpProcedure *procedure,
const GimpValueArray *args)
{
GimpPlugIn *plug_in;
GimpVectorLoadProcedure *load_proc = GIMP_VECTOR_LOAD_PROCEDURE (procedure);
GimpValueArray *remaining;
GimpValueArray *return_values;
GimpProcedureConfig *config;
GimpImage *image = NULL;
GimpMetadata *metadata = NULL;
gchar *mimetype = NULL;
GError *error = NULL;
GimpVectorLoadData extracted_dimensions = { 0 };
gpointer data_for_run = NULL;
GDestroyNotify data_for_run_destroy = NULL;
GimpMetadataLoadFlags flags = GIMP_METADATA_LOAD_ALL;
GimpPDBStatusType status = GIMP_PDB_EXECUTION_ERROR;
GimpRunMode run_mode;
GFile *file;
gint width;
gint height;
gdouble resolution;
gint arg_offset = 0;
gint i;
run_mode = GIMP_VALUES_GET_ENUM (args, arg_offset++);
file = GIMP_VALUES_GET_FILE (args, arg_offset++);
width = GIMP_VALUES_GET_INT (args, arg_offset);
height = GIMP_VALUES_GET_INT (args, arg_offset + 1);
remaining = gimp_value_array_new (gimp_value_array_length (args) - arg_offset);
for (i = arg_offset; i < gimp_value_array_length (args); i++)
{
GValue *value = gimp_value_array_index (args, i);
gimp_value_array_append (remaining, value);
}
config = _gimp_procedure_create_run_config (procedure);
mimetype = (gchar *) gimp_file_procedure_get_mime_types (GIMP_FILE_PROCEDURE (procedure));
if (mimetype != NULL)
{
char *delim;
mimetype = g_strdup (mimetype);
mimetype = g_strstrip (mimetype);
delim = strstr (mimetype, ",");
if (delim)
*delim = '\0';
/* Though docs only writes about the list being comma-separated, our
* code apparently also split by spaces.
*/
delim = strstr (mimetype, " ");
if (delim)
*delim = '\0';
delim = strstr (mimetype, "\t");
if (delim)
*delim = '\0';
metadata = gimp_metadata_load_from_file (file, NULL);
g_free (mimetype);
}
else
{
flags = GIMP_METADATA_LOAD_NONE;
}
if (metadata == NULL)
metadata = gimp_metadata_new ();
_gimp_procedure_config_begin_run (config, image, run_mode, remaining);
g_object_get (config, "pixel-density", &resolution, NULL);
if (load_proc->extract_func)
{
gboolean extract_success;
extract_success = load_proc->extract_func (procedure, run_mode, file, metadata, config,
&extracted_dimensions,
&data_for_run, &data_for_run_destroy,
load_proc->extract_data, &error);
if (extract_success)
{
gdouble default_pixel_width = 0.0;
gdouble default_pixel_height = 0.0;
gdouble default_resolution = GIMP_VECTOR_LOAD_DEFAULT_PIXEL_DENSITY;
gdouble res_pixel_width = 0.0;
gdouble res_pixel_height = 0.0;
gboolean keep_ratio = TRUE;
gboolean prefer_native_dimension = FALSE;
g_object_get (config,
"keep-ratio", &keep_ratio,
"prefer-native-dimensions", &prefer_native_dimension,
NULL);
if (extracted_dimensions.width != 0 && extracted_dimensions.height != 0)
{
if (extracted_dimensions.pixel_density > 0.0 &&
extracted_dimensions.density_unit != GIMP_UNIT_PERCENT &&
extracted_dimensions.density_unit != GIMP_UNIT_PIXEL)
{
if (extracted_dimensions.density_unit == GIMP_UNIT_INCH)
{
resolution = extracted_dimensions.pixel_density;
}
else
{
resolution = extracted_dimensions.pixel_density / gimp_unit_get_factor (extracted_dimensions.density_unit);
}
default_resolution = resolution;
}
if (extracted_dimensions.width_unit == GIMP_UNIT_PIXEL ||
/* This is kinda bogus, but it at least gives ratio data. */
extracted_dimensions.width_unit == GIMP_UNIT_PERCENT)
{
default_pixel_width = extracted_dimensions.width;
res_pixel_width = (gint) default_pixel_width;
}
else
{
gdouble default_inch_width;
default_inch_width = extracted_dimensions.width / gimp_unit_get_factor (extracted_dimensions.width_unit);
default_pixel_width = default_inch_width * default_resolution;
res_pixel_width = (gint) ceil (default_inch_width * resolution);
}
if (extracted_dimensions.height_unit == GIMP_UNIT_PIXEL ||
extracted_dimensions.height_unit == GIMP_UNIT_PERCENT)
{
default_pixel_height = extracted_dimensions.height;
res_pixel_height = (gint) default_pixel_height;
}
else
{
gdouble default_inch_height;
default_inch_height = extracted_dimensions.height / gimp_unit_get_factor (extracted_dimensions.height_unit);
default_pixel_height = default_inch_height * default_resolution;
res_pixel_height = (gint) ceil (default_inch_height * resolution);
}
}
if (default_pixel_width != 0.0 && default_pixel_height != 0.0)
{
GParamSpec *spec;
if (prefer_native_dimension || (width == 0 && height == 0))
{
width = (gint) ceil (res_pixel_width);
height = (gint) ceil (res_pixel_height);
}
else if (keep_ratio || width == 0 || height == 0)
{
gdouble ratio;
ratio = default_pixel_width / default_pixel_height;
if (width == 0)
width = (gint) ceil (ratio * height);
else if (height == 0)
height = (gint) ceil (width / ratio);
else if (ratio * height <= width)
width = (gint) ceil (ratio * height);
else
height = (gint) ceil (width / ratio);
}
spec = g_object_class_find_property (G_OBJECT_GET_CLASS (config), "width");
G_PARAM_SPEC_INT (spec)->default_value = (gint) ceil (default_pixel_width);
spec = g_object_class_find_property (G_OBJECT_GET_CLASS (config), "height");
G_PARAM_SPEC_INT (spec)->default_value = (gint) ceil (default_pixel_height);
if (default_resolution != 0.0)
{
spec = g_object_class_find_property (G_OBJECT_GET_CLASS (config), "pixel-density");
G_PARAM_SPEC_DOUBLE (spec)->default_value = default_resolution;
}
}
if (width == 0 || height == 0)
{
/* If width or height are still 0, something was very wrong. */
g_set_error_literal (&error, GIMP_PLUG_IN_ERROR, 0,
_("dimensions could neither be extracted nor computed "
"from the vector image's data."));
}
}
g_prefix_error_literal (&error, _("Vector image loading plug-in failed: "));
}
/* One or both dimensions are still zero at this point. */
if (width == 0 || height == 0)
{
if (run_mode == GIMP_RUN_INTERACTIVE)
{
/* These values are utter-bogus but we just some value to start and
* let people select proper values in the interactive dialog.
*/
if (width != 0)
height = width;
else if (height != 0)
width = width;
else
width = height = 500;
}
else if (! error)
{
/* Except for interactive case where we can always ask interactively,
* non-interactive (including "with-last-vals") require valid values.
*/
g_set_error_literal (&error, GIMP_PLUG_IN_ERROR, 0,
_("Dimensions cannot be 0 and no native dimensions "
"could be extracted from the vector image."));
}
}
if (error)
{
return_values = gimp_procedure_new_return_values (procedure, status, error);
}
else
{
g_object_set (config,
"width", width,
"height", height,
"pixel-density", resolution,
NULL);
/* In future, when we'll have vector layers, a vector load proc should be
* able to advertize when it can return a vector layer, and when so, we
* can even bypass the dialog (by running non-interactively) and just use
* the defaults, unless it's all bogus.
*/
return_values = load_proc->run_func (procedure,
run_mode,
file, width, height,
extracted_dimensions,
metadata, &flags,
config,
data_for_run,
load_proc->run_data);
if (return_values != NULL &&
gimp_value_array_length (return_values) > 0 &&
G_VALUE_HOLDS_ENUM (gimp_value_array_index (return_values, 0)))
status = GIMP_VALUES_GET_ENUM (return_values, 0);
}
_gimp_procedure_config_end_run (config, status);
if (data_for_run_destroy)
data_for_run_destroy (data_for_run);
if (status == GIMP_PDB_SUCCESS)
{
if (gimp_value_array_length (return_values) < 2 ||
! GIMP_VALUE_HOLDS_IMAGE (gimp_value_array_index (return_values, 1)))
{
status = GIMP_PDB_EXECUTION_ERROR;
g_set_error (&error, GIMP_PLUG_IN_ERROR, 0,
_("This file loading plug-in returned SUCCESS as a status without an image. "
"This is a bug in the plug-in code. Contact the plug-in developer."));
gimp_value_array_unref (return_values);
return_values = gimp_procedure_new_return_values (procedure, status, error);
}
else
{
image = GIMP_VALUES_GET_IMAGE (return_values, 1);
}
}
if (image != NULL && metadata != NULL && flags != GIMP_METADATA_LOAD_NONE)
gimp_image_metadata_load_finish (image, NULL, metadata, flags);
/* This is debug printing to help plug-in developers figure out best
* practices.
*/
plug_in = gimp_procedure_get_plug_in (procedure);
if (G_OBJECT (config)->ref_count > 1 &&
_gimp_plug_in_manage_memory_manually (plug_in))
g_printerr ("%s: ERROR: the GimpProcedureConfig object was refed "
"by plug-in, it MUST NOT do that!\n", G_STRFUNC);
g_object_unref (config);
g_clear_object (&metadata);
gimp_value_array_unref (remaining);
return return_values;
}
/* public functions */
/**
* gimp_vector_load_procedure_new:
* @plug_in: a #GimpPlugIn.
* @name: the new procedure's name.
* @proc_type: the new procedure's #GimpPDBProcType.
* @run_func: the run function for the new procedure.
* @run_data: user data passed to @run_func.
* @run_data_destroy: (nullable): free function for @run_data, or %NULL.
*
* Creates a new load procedure named @name which will call @run_func
* when invoked.
*
* See gimp_procedure_new() for information about @proc_type.
*
* Returns: (transfer full): a new #GimpProcedure.
*
* Since: 3.0
**/
GimpProcedure *
gimp_vector_load_procedure_new (GimpPlugIn *plug_in,
const gchar *name,
GimpPDBProcType proc_type,
GimpExtractVectorFunc extract_func,
gpointer extract_data,
GDestroyNotify extract_data_destroy,
GimpRunVectorLoadFunc run_func,
gpointer run_data,
GDestroyNotify run_data_destroy)
{
GimpVectorLoadProcedure *procedure;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
g_return_val_if_fail (gimp_is_canonical_identifier (name), NULL);
g_return_val_if_fail (proc_type != GIMP_PDB_PROC_TYPE_INTERNAL, NULL);
g_return_val_if_fail (proc_type != GIMP_PDB_PROC_TYPE_EXTENSION, NULL);
g_return_val_if_fail (run_func != NULL, NULL);
procedure = g_object_new (GIMP_TYPE_VECTOR_LOAD_PROCEDURE,
"plug-in", plug_in,
"name", name,
"procedure-type", proc_type,
NULL);
procedure->run_func = run_func;
procedure->run_data = run_data;
procedure->run_data_destroy = run_data_destroy;
procedure->extract_func = extract_func;
procedure->extract_data = extract_data;
procedure->extract_data_destroy = extract_data_destroy;
return GIMP_PROCEDURE (procedure);
}
/**
* gimp_vector_load_procedure_extract_dimensions:
* @procedure: the associated #GimpVectorLoadProcedure.
* @file: a [iface@Gio.File] which can be processed by @procedure.
* @data: (out): the returned dimension data.
* @error: (out): the #GError in case of error.
*
* Extracts native or suggested dimensions from @file, which must be a vector
* file in the right format supported by @procedure. It is considered a
* programming error to pass a file of invalid format.
*
* Returns: %TRUE if dimensions could be extracted.
*/
gboolean
gimp_vector_load_procedure_extract_dimensions (GimpVectorLoadProcedure *procedure,
GFile *file,
GimpVectorLoadData *data,
GError **error)
{
gboolean extract_success = FALSE;
g_return_val_if_fail (GIMP_IS_VECTOR_LOAD_PROCEDURE (procedure), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (procedure->extract_func)
{
gchar *mimetype = NULL;
GimpMetadata *metadata = NULL;
gpointer data_for_run = NULL;
GDestroyNotify data_for_run_destroy = NULL;
mimetype = (gchar *) gimp_file_procedure_get_mime_types (GIMP_FILE_PROCEDURE (procedure));
if (mimetype != NULL)
{
char *delim;
mimetype = g_strdup (mimetype);
mimetype = g_strstrip (mimetype);
delim = strstr (mimetype, ",");
if (delim)
*delim = '\0';
/* Though docs only writes about the list being comma-separated, our
* code apparently also split by spaces.
*/
delim = strstr (mimetype, " ");
if (delim)
*delim = '\0';
delim = strstr (mimetype, "\t");
if (delim)
*delim = '\0';
metadata = gimp_metadata_load_from_file (file, NULL);
g_free (mimetype);
}
if (metadata == NULL)
metadata = gimp_metadata_new ();
extract_success = procedure->extract_func (GIMP_PROCEDURE (procedure),
GIMP_RUN_NONINTERACTIVE,
file, metadata, NULL,
data, &data_for_run, &data_for_run_destroy,
procedure->extract_data, error);
if (data_for_run_destroy)
data_for_run_destroy (data_for_run);
g_clear_object (&metadata);
}
return extract_success;
}
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