sistema_progs

thumbs.c (13918B)

---

 /* Copyright 2011 Bert Muennich
  *
  * This file is part of sxiv.
  *
  * sxiv 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.
  *
  * sxiv 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 sxiv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "sxiv.h"
 #define _THUMBS_CONFIG
 #include "config.h"
 
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <utime.h>
 
 #if HAVE_LIBEXIF
 #include <libexif/exif-data.h>
 void exif_auto_orientate(const fileinfo_t*);
 #endif
 Imlib_Image img_open(const fileinfo_t*);
 
 static char *cache_dir;
 
 char* tns_cache_filepath(const char *filepath)
 {
 	size_t len;
 	char *cfile = NULL;
 
 	if (*filepath != '/')
 		return NULL;
 	
 	if (strncmp(filepath, cache_dir, strlen(cache_dir)) != 0) {
 		/* don't cache images inside the cache directory! */
 		len = strlen(cache_dir) + strlen(filepath) + 2;
 		cfile = (char*) emalloc(len);
 		snprintf(cfile, len, "%s/%s", cache_dir, filepath + 1);
 	}
 	return cfile;
 }
 
 Imlib_Image tns_cache_load(const char *filepath, bool *outdated)
 {
 	char *cfile;
 	struct stat cstats, fstats;
 	Imlib_Image im = NULL;
 
 	if (stat(filepath, &fstats) < 0)
 		return NULL;
 
 	if ((cfile = tns_cache_filepath(filepath)) != NULL) {
 		if (stat(cfile, &cstats) == 0) {
 			if (cstats.st_mtime == fstats.st_mtime)
 				im = imlib_load_image(cfile);
 			else
 				*outdated = true;
 		}
 		free(cfile);
 	}
 	return im;
 }
 
 void tns_cache_write(Imlib_Image im, const char *filepath, bool force)
 {
 	char *cfile, *dirend;
 	struct stat cstats, fstats;
 	struct utimbuf times;
 	Imlib_Load_Error err;
 
 	if (options->private_mode)
 		return;
 
 	if (stat(filepath, &fstats) < 0)
 		return;
 
 	if ((cfile = tns_cache_filepath(filepath)) != NULL) {
 		if (force || stat(cfile, &cstats) < 0 ||
 		    cstats.st_mtime != fstats.st_mtime)
 		{
 			if ((dirend = strrchr(cfile, '/')) != NULL) {
 				*dirend = '\0';
 				if (r_mkdir(cfile) == -1) {
 					error(0, errno, "%s", cfile);
 					goto end;
 				}
 				*dirend = '/';
 			}
 			imlib_context_set_image(im);
 			if (imlib_image_has_alpha()) {
 				imlib_image_set_format("png");
 			} else {
 				imlib_image_set_format("jpg");
 				imlib_image_attach_data_value("quality", NULL, 90, NULL);
 			}
 			imlib_save_image_with_error_return(cfile, &err);
 			if (err)
 				goto end;
 			times.actime = fstats.st_atime;
 			times.modtime = fstats.st_mtime;
 			utime(cfile, &times);
 		}
 end:
 		free(cfile);
 	}
 }
 
 void tns_clean_cache(tns_t *tns)
 {
 	int dirlen;
 	char *cfile, *filename;
 	r_dir_t dir;
 
 	if (r_opendir(&dir, cache_dir, true) < 0) {
 		error(0, errno, "%s", cache_dir);
 		return;
 	}
 
 	dirlen = strlen(cache_dir);
 
 	while ((cfile = r_readdir(&dir, false)) != NULL) {
 		filename = cfile + dirlen;
 		if (access(filename, F_OK) < 0) {
 			if (unlink(cfile) < 0)
 				error(0, errno, "%s", cfile);
 		}
 		free(cfile);
 	}
 	r_closedir(&dir);
 }
 
 
 void tns_init(tns_t *tns, fileinfo_t *files, const int *cnt, int *sel,
               win_t *win)
 {
 	int len;
 	const char *homedir, *dsuffix = "";
 
 	if (cnt != NULL && *cnt > 0) {
 		tns->thumbs = (thumb_t*) emalloc(*cnt * sizeof(thumb_t));
 		memset(tns->thumbs, 0, *cnt * sizeof(thumb_t));
 	} else {
 		tns->thumbs = NULL;
 	}
 	tns->files = files;
 	tns->cnt = cnt;
 	tns->initnext = tns->loadnext = 0;
 	tns->first = tns->end = tns->r_first = tns->r_end = 0;
 	tns->sel = sel;
 	tns->win = win;
 	tns->dirty = false;
 
 	tns->zl = THUMB_SIZE;
 	tns_zoom(tns, 0);
 
 	if ((homedir = getenv("XDG_CACHE_HOME")) == NULL || homedir[0] == '\0') {
 		homedir = getenv("HOME");
 		dsuffix = "/.cache";
 	}
 	if (homedir != NULL) {
 		free(cache_dir);
 		len = strlen(homedir) + strlen(dsuffix) + 6;
 		cache_dir = (char*) emalloc(len);
 		snprintf(cache_dir, len, "%s%s/sxiv", homedir, dsuffix);
 	} else {
 		error(0, 0, "Cache directory not found");
 	}
 }
 
 CLEANUP void tns_free(tns_t *tns)
 {
 	int i;
 
 	if (tns->thumbs != NULL) {
 		for (i = 0; i < *tns->cnt; i++) {
 			if (tns->thumbs[i].im != NULL) {
 				imlib_context_set_image(tns->thumbs[i].im);
 				imlib_free_image();
 			}
 		}
 		free(tns->thumbs);
 		tns->thumbs = NULL;
 	}
 
 	free(cache_dir);
 	cache_dir = NULL;
 }
 
 Imlib_Image tns_scale_down(Imlib_Image im, int dim)
 {
 	int w, h;
 	float z, zw, zh;
 
 	imlib_context_set_image(im);
 	w = imlib_image_get_width();
 	h = imlib_image_get_height();
 	zw = (float) dim / (float) w;
 	zh = (float) dim / (float) h;
 	z = MIN(zw, zh);
 	z = MIN(z, 1.0);
 
 	if (z < 1.0) {
 		imlib_context_set_anti_alias(1);
 		im = imlib_create_cropped_scaled_image(0, 0, w, h,
 		                                       MAX(z * w, 1), MAX(z * h, 1));
 		if (im == NULL)
 			error(EXIT_FAILURE, ENOMEM, NULL);
 		imlib_free_image_and_decache();
 	}
 	return im;
 }
 
 bool tns_load(tns_t *tns, int n, bool force, bool cache_only)
 {
 	int maxwh = thumb_sizes[ARRLEN(thumb_sizes)-1];
 	bool cache_hit = false;
 	char *cfile;
 	thumb_t *t;
 	fileinfo_t *file;
 	Imlib_Image im = NULL;
 
 	if (n < 0 || n >= *tns->cnt)
 		return false;
 	file = &tns->files[n];
 	if (file->name == NULL || file->path == NULL)
 		return false;
 
 	t = &tns->thumbs[n];
 
 	if (t->im != NULL) {
 		imlib_context_set_image(t->im);
 		imlib_free_image();
 		t->im = NULL;
 	}
 
 	if (!force) {
 		if ((im = tns_cache_load(file->path, &force)) != NULL) {
 			imlib_context_set_image(im);
 			if (imlib_image_get_width() < maxwh &&
 			    imlib_image_get_height() < maxwh)
 			{
 				if ((cfile = tns_cache_filepath(file->path)) != NULL) {
 					unlink(cfile);
 					free(cfile);
 				}
 				imlib_free_image_and_decache();
 				im = NULL;
 			} else {
 				cache_hit = true;
 			}
 #if HAVE_LIBEXIF
 		} else if (!force && !options->private_mode) {
 			int pw = 0, ph = 0, w, h, x = 0, y = 0;
 			bool err;
 			float zw, zh;
 			ExifData *ed;
 			ExifEntry *entry;
 			ExifContent *ifd;
 			ExifByteOrder byte_order;
 			int tmpfd;
 			char tmppath[] = "/tmp/sxiv-XXXXXX";
 			Imlib_Image tmpim;
 
 			if ((ed = exif_data_new_from_file(file->path)) != NULL) {
 				if (ed->data != NULL && ed->size > 0 &&
 				    (tmpfd = mkstemp(tmppath)) >= 0)
 				{
 					err = write(tmpfd, ed->data, ed->size) != ed->size;
 					close(tmpfd);
 
 					if (!err && (tmpim = imlib_load_image(tmppath)) != NULL) {
 						byte_order = exif_data_get_byte_order(ed);
 						ifd = ed->ifd[EXIF_IFD_EXIF];
 						entry = exif_content_get_entry(ifd, EXIF_TAG_PIXEL_X_DIMENSION);
 						if (entry != NULL)
 							pw = exif_get_long(entry->data, byte_order);
 						entry = exif_content_get_entry(ifd, EXIF_TAG_PIXEL_Y_DIMENSION);
 						if (entry != NULL)
 							ph = exif_get_long(entry->data, byte_order);
 
 						imlib_context_set_image(tmpim);
 						w = imlib_image_get_width();
 						h = imlib_image_get_height();
 
 						if (pw > w && ph > h && (pw - ph >= 0) == (w - h >= 0)) {
 							zw = (float) pw / (float) w;
 							zh = (float) ph / (float) h;
 							if (zw < zh) {
 								pw /= zh;
 								x = (w - pw) / 2;
 								w = pw;
 							} else if (zw > zh) {
 								ph /= zw;
 								y = (h - ph) / 2;
 								h = ph;
 							}
 						}
 						if (w >= maxwh || h >= maxwh) {
 							if ((im = imlib_create_cropped_image(x, y, w, h)) == NULL)
 								error(EXIT_FAILURE, ENOMEM, NULL);
 						}
 						imlib_free_image_and_decache();
 					}
 					unlink(tmppath);
 				}
 				exif_data_unref(ed);
 			}
 #endif
 		}
 	}
 
 	if (im == NULL) {
 		if ((im = img_open(file)) == NULL)
 			return false;
 	}
 	imlib_context_set_image(im);
 
 	if (!cache_hit) {
 #if HAVE_LIBEXIF
 		exif_auto_orientate(file);
 #endif
 		im = tns_scale_down(im, maxwh);
 		imlib_context_set_image(im);
 		if (imlib_image_get_width() == maxwh || imlib_image_get_height() == maxwh)
 			tns_cache_write(im, file->path, true);
 	}
 
 	if (cache_only) {
 		imlib_free_image_and_decache();
 	} else {
 		t->im = tns_scale_down(im, thumb_sizes[tns->zl]);
 		imlib_context_set_image(t->im);
 		t->w = imlib_image_get_width();
 		t->h = imlib_image_get_height();
 		tns->dirty = true;
 	}
 	file->flags |= FF_TN_INIT;
 
 	if (n == tns->initnext)
 		while (++tns->initnext < *tns->cnt && ((++file)->flags & FF_TN_INIT));
 	if (n == tns->loadnext && !cache_only)
 		while (++tns->loadnext < tns->end && (++t)->im != NULL);
 
 	return true;
 }
 
 void tns_unload(tns_t *tns, int n)
 {
 	thumb_t *t;
 
 	if (n < 0 || n >= *tns->cnt)
 		return;
 
 	t = &tns->thumbs[n];
 
 	if (t->im != NULL) {
 		imlib_context_set_image(t->im);
 		imlib_free_image();
 		t->im = NULL;
 	}
 }
 
 void tns_check_view(tns_t *tns, bool scrolled)
 {
 	int r;
 
 	if (tns == NULL)
 		return;
 
 	tns->first -= tns->first % tns->cols;
 	r = *tns->sel % tns->cols;
 
 	if (scrolled) {
 		/* move selection into visible area */
 		if (*tns->sel >= tns->first + tns->cols * tns->rows)
 			*tns->sel = tns->first + r + tns->cols * (tns->rows - 1);
 		else if (*tns->sel < tns->first)
 			*tns->sel = tns->first + r;
 	} else {
 		/* scroll to selection */
 		if (tns->first + tns->cols * tns->rows <= *tns->sel) {
 			tns->first = *tns->sel - r - tns->cols * (tns->rows - 1);
 			tns->dirty = true;
 		} else if (tns->first > *tns->sel) {
 			tns->first = *tns->sel - r;
 			tns->dirty = true;
 		}
 	}
 }
 
 void tns_render(tns_t *tns)
 {
 	thumb_t *t;
 	win_t *win;
 	int i, cnt, r, x, y;
 
 	if (!tns->dirty)
 		return;
 
 	win = tns->win;
 	win_clear(win);
 	imlib_context_set_drawable(win->buf.pm);
 
 	tns->cols = MAX(1, win->w / tns->dim);
 	tns->rows = MAX(1, win->h / tns->dim);
 
 	if (*tns->cnt < tns->cols * tns->rows) {
 		tns->first = 0;
 		cnt = *tns->cnt;
 	} else {
 		tns_check_view(tns, false);
 		cnt = tns->cols * tns->rows;
 		if ((r = tns->first + cnt - *tns->cnt) >= tns->cols)
 			tns->first -= r - r % tns->cols;
 		if (r > 0)
 			cnt -= r % tns->cols;
 	}
 	r = cnt % tns->cols ? 1 : 0;
 	tns->x = x = (win->w - MIN(cnt, tns->cols) * tns->dim) / 2 + tns->bw + 3;
 	tns->y = y = (win->h - (cnt / tns->cols + r) * tns->dim) / 2 + tns->bw + 3;
 	tns->loadnext = *tns->cnt;
 	tns->end = tns->first + cnt;
 
 	for (i = tns->r_first; i < tns->r_end; i++) {
 		if ((i < tns->first || i >= tns->end) && tns->thumbs[i].im != NULL)
 			tns_unload(tns, i);
 	}
 	tns->r_first = tns->first;
 	tns->r_end = tns->end;
 
 	for (i = tns->first; i < tns->end; i++) {
 		t = &tns->thumbs[i];
 		if (t->im != NULL) {
 			t->x = x + (thumb_sizes[tns->zl] - t->w) / 2;
 			t->y = y + (thumb_sizes[tns->zl] - t->h) / 2;
 			imlib_context_set_image(t->im);
 			imlib_render_image_on_drawable_at_size(t->x, t->y, t->w, t->h);
 			if (tns->files[i].flags & FF_MARK)
 				tns_mark(tns, i, true);
 		} else {
 			tns->loadnext = MIN(tns->loadnext, i);
 		}
 		if ((i + 1) % tns->cols == 0) {
 			x = tns->x;
 			y += tns->dim;
 		} else {
 			x += tns->dim;
 		}
 	}
 	tns->dirty = false;
 	tns_highlight(tns, *tns->sel, true);
 }
 
 void tns_mark(tns_t *tns, int n, bool mark)
 {
 	if (n >= 0 && n < *tns->cnt && tns->thumbs[n].im != NULL) {
 		win_t *win = tns->win;
 		thumb_t *t = &tns->thumbs[n];
 		unsigned long col = win->bg.pixel;
 		int x = t->x + t->w, y = t->y + t->h;
 
 		win_draw_rect(win, x - 1, y + 1, 1, tns->bw, true, 1, col);
 		win_draw_rect(win, x + 1, y - 1, tns->bw, 1, true, 1, col);
 
 		if (mark)
 			col = win->fg.pixel;
 
 		win_draw_rect(win, x, y, tns->bw + 2, tns->bw + 2, true, 1, col);
 
 		if (!mark && n == *tns->sel)
 			tns_highlight(tns, n, true);
 	}
 }
 
 void tns_highlight(tns_t *tns, int n, bool hl)
 {
 	if (n >= 0 && n < *tns->cnt && tns->thumbs[n].im != NULL) {
 		win_t *win = tns->win;
 		thumb_t *t = &tns->thumbs[n];
 		unsigned long col = hl ? win->fg.pixel : win->bg.pixel;
 		int oxy = (tns->bw + 1) / 2 + 1, owh = tns->bw + 2;
 
 		win_draw_rect(win, t->x - oxy, t->y - oxy, t->w + owh, t->h + owh,
 		              false, tns->bw, col);
 
 		if (tns->files[n].flags & FF_MARK)
 			tns_mark(tns, n, true);
 	}
 }
 
 bool tns_move_selection(tns_t *tns, direction_t dir, int cnt)
 {
 	int old, max;
 
 	old = *tns->sel;
 	cnt = cnt > 1 ? cnt : 1;
 
 	switch (dir) {
 		case DIR_UP:
 			*tns->sel = MAX(*tns->sel - cnt * tns->cols, *tns->sel % tns->cols);
 			break;
 		case DIR_DOWN:
 			max = tns->cols * ((*tns->cnt - 1) / tns->cols) +
 			      MIN((*tns->cnt - 1) % tns->cols, *tns->sel % tns->cols);
 			*tns->sel = MIN(*tns->sel + cnt * tns->cols, max);
 			break;
 		case DIR_LEFT:
 			*tns->sel = MAX(*tns->sel - cnt, 0);
 			break;
 		case DIR_RIGHT:
 			*tns->sel = MIN(*tns->sel + cnt, *tns->cnt - 1);
 			break;
 	}
 
 	if (*tns->sel != old) {
 		tns_highlight(tns, old, false);
 		tns_check_view(tns, false);
 		if (!tns->dirty)
 			tns_highlight(tns, *tns->sel, true);
 	}
 	return *tns->sel != old;
 }
 
 bool tns_scroll(tns_t *tns, direction_t dir, bool screen)
 {
 	int d, max, old;
 
 	old = tns->first;
 	d = tns->cols * (screen ? tns->rows : 1);
 
 	if (dir == DIR_DOWN) {
 		max = *tns->cnt - tns->cols * tns->rows;
 		if (*tns->cnt % tns->cols != 0)
 			max += tns->cols - *tns->cnt % tns->cols;
 		tns->first = MIN(tns->first + d, max);
 	} else if (dir == DIR_UP) {
 		tns->first = MAX(tns->first - d, 0);
 	}
 
 	if (tns->first != old) {
 		tns_check_view(tns, true);
 		tns->dirty = true;
 	}
 	return tns->first != old;
 }
 
 bool tns_zoom(tns_t *tns, int d)
 {
 	int i, oldzl;
 
 	oldzl = tns->zl;
 	tns->zl += -(d < 0) + (d > 0);
 	tns->zl = MAX(tns->zl, 0);
 	tns->zl = MIN(tns->zl, ARRLEN(thumb_sizes)-1);
 
 	tns->bw = ((thumb_sizes[tns->zl] - 1) >> 5) + 1;
 	tns->bw = MIN(tns->bw, 4);
 	tns->dim = thumb_sizes[tns->zl] + 2 * tns->bw + 6;
 
 	if (tns->zl != oldzl) {
 		for (i = 0; i < *tns->cnt; i++)
 			tns_unload(tns, i);
 		tns->dirty = true;
 	}
 	return tns->zl != oldzl;
 }
 
 int tns_translate(tns_t *tns, int x, int y)
 {
 	int n;
 
 	if (x < tns->x || y < tns->y)
 		return -1;
 
 	n = tns->first + (y - tns->y) / tns->dim * tns->cols +
 	    (x - tns->x) / tns->dim;
 	if (n >= *tns->cnt)
 		n = -1;
 
 	return n;
 }