cache-loader.c

Gqview,Linux下基于GTK+库写成的轻量级而能丰富的图像浏览程序。

/*
 * GQview
 * (C) 2005 John Ellis
 *
 * Author: John Ellis
 *
 * This software is released under the GNU General Public License (GNU GPL).
 * Please read the included file COPYING for more information.
 * This software comes with no warranty of any kind, use at your own risk!
 */

#include "gqview.h"
#include "cache-loader.h"

#include "exif.h"
#include "md5-util.h"
#include "ui_fileops.h"


static gboolean cache_loader_process(CacheLoader *cl);


static void cache_loader_done_cb(ImageLoader *il, gpointer data)
{
	CacheLoader *cl = data;

	cache_loader_process(cl);
}

static void cache_loader_error_cb(ImageLoader *il, gpointer data)
{
	CacheLoader *cl = data;

	cl->error = TRUE;
	cache_loader_done_cb(il, data);
}

static gboolean cache_loader_process(CacheLoader *cl)
{
	if (cl->todo_mask & CACHE_LOADER_SIMILARITY &&
	    !cl->cd->similarity)
		{
		GdkPixbuf *pixbuf;

		if (!cl->il && !cl->error)
			{
			cl->il = image_loader_new(cl->path);
			image_loader_set_error_func(cl->il, cache_loader_error_cb, cl);
			if (image_loader_start(cl->il, cache_loader_done_cb, cl))
				{
				return FALSE;
				}

			cl->error = TRUE;
			}

		pixbuf = image_loader_get_pixbuf(cl->il);
		if (pixbuf)
			{
			if (!cl->error)
				{
				ImageSimilarityData *sim;

				sim = image_sim_new_from_pixbuf(pixbuf);
				cache_sim_data_set_similarity(cl->cd, sim);
				image_sim_free(sim);

				cl->done_mask |= CACHE_LOADER_SIMILARITY;
				}

			/* we have the dimensions via pixbuf */
			if (!cl->cd->dimensions)
				{
				cache_sim_data_set_dimensions(cl->cd, gdk_pixbuf_get_width(pixbuf),
								      gdk_pixbuf_get_height(pixbuf));
				if (cl->todo_mask & CACHE_LOADER_DIMENSIONS)
					{
					cl->todo_mask &= ~CACHE_LOADER_DIMENSIONS;
					cl->done_mask |= CACHE_LOADER_DIMENSIONS;
					}
				}
			}

		image_loader_free(cl->il);
		cl->il = NULL;

		cl->todo_mask &= ~CACHE_LOADER_SIMILARITY;
		}
	else if (cl->todo_mask & CACHE_LOADER_DIMENSIONS &&
		 !cl->cd->dimensions)
		{
		if (!cl->error &&
		    image_load_dimensions(cl->path, &cl->cd->width, &cl->cd->height))
			{
			cl->cd->dimensions = TRUE;
			cl->done_mask |= CACHE_LOADER_DIMENSIONS;
			}
		else
			{
			cl->error = TRUE;
			}

		cl->todo_mask &= ~CACHE_LOADER_DIMENSIONS;
		}
	else if (cl->todo_mask & CACHE_LOADER_MD5SUM &&
		 !cl->cd->have_md5sum)
		{
		if (md5_get_digest_from_file_utf8(cl->path, cl->cd->md5sum))
			{
			cl->cd->have_md5sum = TRUE;
			cl->done_mask |= CACHE_LOADER_MD5SUM;
			}
		else
			{
			cl->error = TRUE;
			}

		cl->todo_mask &= ~CACHE_LOADER_MD5SUM;
		}
	else if (cl->todo_mask & CACHE_LOADER_DATE &&
		 !cl->cd->have_date)
		{
		time_t date = -1;
		ExifData *exif;

		exif = exif_read(cl->path);
		if (exif)
			{
			gchar *text;

			text = exif_get_data_as_text(exif, "fDateTime");
			if (text)
				{
				struct tm t = { 0 };

				if (sscanf(text, "%d:%d:%d %d:%d:%d", &t.tm_year, &t.tm_mon, &t.tm_mday,
					   &t.tm_hour, &t.tm_min, &t.tm_sec) == 6)
					{
					t.tm_year -= 1900;
					t.tm_mon -= 1;
					date = mktime(&t);
					}
				g_free(text);
				}
			exif_free(exif);
			}

		cl->cd->date = date;
		cl->cd->have_date = TRUE;

		cl->done_mask |= CACHE_LOADER_DATE;
		cl->todo_mask &= ~CACHE_LOADER_DATE;
		}
	else
		{
		/* done, save then call done function */
		if (enable_thumb_caching &&
		    cl->done_mask != CACHE_LOADER_NONE)
			{
			gchar *base;
			mode_t mode = 0755;

			base = cache_get_location(CACHE_TYPE_SIM, cl->path, FALSE, &mode);
			if (cache_ensure_dir_exists(base, mode))
				{
				g_free(cl->cd->path);
				cl->cd->path = cache_get_location(CACHE_TYPE_SIM, cl->path, TRUE, NULL);
				if (cache_sim_data_save(cl->cd))
					{
					filetime_set(cl->cd->path, filetime(cl->path));
					}
				}
			g_free(base);
			}

		cl->idle_id = -1;

		if (cl->done_func)
			{
			cl->done_func(cl, cl->error, cl->done_data);
			}

		return FALSE;
		}

	return TRUE;
}

static gboolean cache_loader_idle_cb(gpointer data)
{
	CacheLoader *cl = data;

	return cache_loader_process(cl);
}

CacheLoader *cache_loader_new(const gchar *path, CacheDataType load_mask,
			      CacheLoaderDoneFunc done_func, gpointer done_data)
{
	CacheLoader *cl;
	gchar *found;

	if (!path || !isfile(path)) return NULL;

	cl = g_new0(CacheLoader, 1);
	cl->path = g_strdup(path);

	cl->done_func = done_func;
	cl->done_data = done_data;

	found = cache_find_location(CACHE_TYPE_SIM, path);
	if (found && filetime(found) == filetime(path))
		{
		cl->cd = cache_sim_data_load(found);
		}
	g_free(found);

	if (!cl->cd) cl->cd = cache_sim_data_new();

	cl->todo_mask = load_mask;
	cl->done_mask = CACHE_LOADER_NONE;

	cl->il = NULL;
	cl->idle_id = g_idle_add(cache_loader_idle_cb, cl);

	cl->error = FALSE;

	return cl;
}

void cache_loader_free(CacheLoader *cl)
{
	if (!cl) return;

	if (cl->idle_id != -1)
		{
		g_source_remove(cl->idle_id);
		cl->idle_id = -1;
		}

	image_loader_free(cl->il);
	cache_sim_data_free(cl->cd);

	g_free(cl->path);
	g_free(cl);
}