gds-render/output-renderers/external-renderer.c

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/*
* GDSII-Converter
* Copyright (C) 2018 Mario Hüttel <mario.huettel@gmx.net>
*
* This file is part of GDSII-Converter.
*
* GDSII-Converter is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* GDSII-Converter 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 GDSII-Converter. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file external-renderer.c
* @brief This file implements the dynamic library loading for the external rendering feature
* @author Mario Hüttel <mario.huettel@gmx.net>
*/
/**
* @addtogroup ExternalRenderer
* @{
*/
#include <dlfcn.h>
#include <stdio.h>
#include <gds-render/output-renderers/external-renderer.h>
struct _ExternalRenderer {
GdsOutputRenderer parent;
char *shared_object_path;
};
enum {
PROP_SO_PATH = 1, /**< @brief Shared object path property */
N_PROPERTIES /**< @brief Used to get property count */
};
G_DEFINE_TYPE(ExternalRenderer, external_renderer, GDS_RENDER_TYPE_OUTPUT_RENDERER)
/**
* @brief Execute render function in shared object to render the supplied cell
* @param toplevel_cell Cell to render
* @param layer_info_list Layer information (Color etc.)
* @param output_file Destination file
* @param so_path Path to shared object
* @return 0 if successful
*/
static int external_renderer_render_cell(struct gds_cell *toplevel_cell, GList *layer_info_list,
const char *output_file, double scale, const char *so_path)
{
int (*so_render_func)(struct gds_cell *, GList *, const char *, double) = NULL;
void *so_handle = NULL;
char *error_msg;
int ret = 0;
if (!so_path) {
g_error("Path to shared object not set!");
return -3000;
}
/* Check parameter sanity */
if (!output_file || !toplevel_cell || !layer_info_list)
return -3000;
/* Load shared object */
so_handle = dlopen(so_path, RTLD_LAZY);
if (!so_handle) {
g_error("Could not load external library '%s'\nDetailed error is:\n%s", so_path, dlerror());
return -2000;
}
/* Load symbol from library */
so_render_func = (int (*)(struct gds_cell *, GList *, const char *, double))dlsym(so_handle, EXTERNAL_LIBRARY_FUNCTION);
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error_msg = dlerror();
if (error_msg != NULL) {
g_error("Rendering function not found in library:\n%s\n", error_msg);
goto ret_close_so_handle;
}
/* Execute */
if (so_render_func)
ret = so_render_func(toplevel_cell, layer_info_list, output_file, scale);
ret_close_so_handle:
dlclose(so_handle);
return ret;
}
static int external_renderer_render_output(GdsOutputRenderer *renderer,
struct gds_cell *cell,
GList *layer_infos,
const char *output_file,
double scale)
{
ExternalRenderer *ext_renderer = GDS_RENDER_EXTERNAL_RENDERER(renderer);
return external_renderer_render_cell(cell, layer_infos, output_file, scale, ext_renderer->shared_object_path);
}
static void external_renderer_get_property(GObject *obj, guint property_id, GValue *value, GParamSpec *pspec)
{
ExternalRenderer *self;
self = GDS_RENDER_EXTERNAL_RENDERER(obj);
switch (property_id) {
case PROP_SO_PATH:
g_value_set_string(value, self->shared_object_path);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, property_id, pspec);
break;
}
}
static void external_renderer_set_property(GObject *obj, guint property_id, const GValue *value, GParamSpec *pspec)
{
ExternalRenderer *self;
self = GDS_RENDER_EXTERNAL_RENDERER(obj);
switch (property_id) {
case PROP_SO_PATH:
if (self->shared_object_path)
g_free(self->shared_object_path);
self->shared_object_path = g_value_dup_string(value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, property_id, pspec);
break;
}
}
static GParamSpec *external_renderer_properties[N_PROPERTIES] = {NULL};
static void external_renderer_class_init(ExternalRendererClass *klass)
{
GdsOutputRendererClass *inherited_parent_class;
GObjectClass *oclass;
inherited_parent_class = GDS_RENDER_OUTPUT_RENDERER_CLASS(klass);
oclass = G_OBJECT_CLASS(oclass);
/* Override virtual function */
inherited_parent_class->render_output = external_renderer_render_output;
/* Setup property callbacks */
oclass->set_property = external_renderer_set_property;
oclass->get_property = external_renderer_get_property;
/* Setup properties */
external_renderer_properties[PROP_SO_PATH] =
g_param_spec_string("shared-object-path",
"Shared object file path",
"Path to the shared object to search rendering function in.",
NULL,
G_PARAM_READWRITE);
g_object_class_install_properties(oclass, N_PROPERTIES, external_renderer_properties);
}
static void external_renderer_init(ExternalRenderer *self)
{
self->shared_object_path = NULL;
}
ExternalRenderer *external_renderer_new()
{
return g_object_new(GDS_RENDER_TYPE_EXTERNAL_RENDERER, NULL);
}
/** @} */