/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
/*
+ * Copyright (C) 2009 Carlos Garcia Campos
* Copyright (C) 2004 Marco Pesenti Gritti
*
* This program is free software; you can redistribute it and/or modify
*
* 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
+#include <stdlib.h>
+#include <string.h>
+
#include "ev-document.h"
+#include "ev-document-misc.h"
+#include "synctex_parser.h"
+
+#define EV_DOCUMENT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), EV_TYPE_DOCUMENT, EvDocumentPrivate))
+
+typedef struct _EvPageSize
+{
+ gdouble width;
+ gdouble height;
+} EvPageSize;
+
+struct _EvDocumentPrivate
+{
+ gchar *uri;
+
+ gint n_pages;
+
+ gboolean uniform;
+ gdouble uniform_width;
+ gdouble uniform_height;
+
+ gdouble max_width;
+ gdouble max_height;
+ gdouble min_width;
+ gdouble min_height;
+ gint max_label;
+
+ gchar **page_labels;
+ EvPageSize *page_sizes;
+ EvDocumentInfo *info;
+
+ synctex_scanner_t synctex_scanner;
+};
+
+static gint _ev_document_get_n_pages (EvDocument *document);
+static void _ev_document_get_page_size (EvDocument *document,
+ EvPage *page,
+ double *width,
+ double *height);
+static gchar *_ev_document_get_page_label (EvDocument *document,
+ EvPage *page);
+static EvDocumentInfo *_ev_document_get_info (EvDocument *document);
+static gboolean _ev_document_support_synctex (EvDocument *document);
GMutex *ev_doc_mutex = NULL;
GMutex *ev_fc_mutex = NULL;
-EV_DEFINE_INTERFACE (EvDocument, ev_document, G_TYPE_OBJECT)
+G_DEFINE_ABSTRACT_TYPE (EvDocument, ev_document, G_TYPE_OBJECT)
GQuark
ev_document_error_quark (void)
return q;
}
+static EvPage *
+ev_document_impl_get_page (EvDocument *document,
+ gint index)
+{
+ return ev_page_new (index);
+}
+
+static EvDocumentInfo *
+ev_document_impl_get_info (EvDocument *document)
+{
+ return g_new0 (EvDocumentInfo, 1);
+}
+
static void
-ev_document_class_init (EvDocumentIface *klass)
+ev_document_finalize (GObject *object)
{
+ EvDocument *document = EV_DOCUMENT (object);
+
+ if (document->priv->uri) {
+ g_free (document->priv->uri);
+ document->priv->uri = NULL;
+ }
+
+ if (document->priv->page_sizes) {
+ g_free (document->priv->page_sizes);
+ document->priv->page_sizes = NULL;
+ }
+
+ if (document->priv->page_labels) {
+ gint i;
+
+ for (i = 0; i < document->priv->n_pages; i++) {
+ g_free (document->priv->page_labels[i]);
+ }
+ g_free (document->priv->page_labels);
+ document->priv->page_labels = NULL;
+ }
+
+ if (document->priv->info) {
+ ev_document_info_free (document->priv->info);
+ document->priv->info = NULL;
+ }
+
+ if (document->priv->synctex_scanner) {
+ synctex_scanner_free (document->priv->synctex_scanner);
+ document->priv->synctex_scanner = NULL;
+ }
+
+ G_OBJECT_CLASS (ev_document_parent_class)->finalize (object);
+}
+
+static void
+ev_document_init (EvDocument *document)
+{
+ document->priv = EV_DOCUMENT_GET_PRIVATE (document);
+
+ /* Assume all pages are the same size until proven otherwise */
+ document->priv->uniform = TRUE;
+}
+
+static void
+ev_document_class_init (EvDocumentClass *klass)
+{
+ GObjectClass *g_object_class = G_OBJECT_CLASS (klass);
+
+ g_type_class_add_private (g_object_class, sizeof (EvDocumentPrivate));
+
+ klass->get_page = ev_document_impl_get_page;
+ klass->get_info = ev_document_impl_get_info;
+ klass->get_backend_info = NULL;
+
+ g_object_class->finalize = ev_document_finalize;
}
GMutex *
* @error: a #GError location to store an error, or %NULL
*
* Loads @document from @uri.
- * On failure, @error is filled in.
+ *
+ * On failure, %FALSE is returned and @error is filled in.
+ * If the document is encrypted, EV_DEFINE_ERROR_ENCRYPTED is returned.
+ * If the backend cannot load the specific document, EV_DOCUMENT_ERROR_INVALID
+ * is returned. Other errors are possible too, depending on the backend
+ * used to load the document and the URI, e.g. #GIOError, #GFileError, and
+ * #GConvertError.
*
* Returns: %TRUE on success, or %FALSE on failure.
*/
const char *uri,
GError **error)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
gboolean retval;
-
- retval = iface->load (document, uri, error);
+ GError *err = NULL;
+
+ retval = klass->load (document, uri, &err);
+ if (!retval) {
+ if (err) {
+ g_propagate_error (error, err);
+ } else {
+ g_warning ("%s::EvDocument::load returned FALSE but did not fill in @error; fix the backend!\n",
+ G_OBJECT_TYPE_NAME (document));
+
+ /* So upper layers don't crash */
+ g_set_error_literal (error,
+ EV_DOCUMENT_ERROR,
+ EV_DOCUMENT_ERROR_INVALID,
+ "Internal error in backend");
+ }
+ } else {
+ gint i;
+ EvDocumentPrivate *priv = document->priv;
+
+ /* Cache some info about the document to avoid
+ * going to the backends since it requires locks
+ */
+ priv->uri = g_strdup (uri);
+ priv->n_pages = _ev_document_get_n_pages (document);
+
+ for (i = 0; i < priv->n_pages; i++) {
+ EvPage *page = ev_document_get_page (document, i);
+ gdouble page_width = 0;
+ gdouble page_height = 0;
+ EvPageSize *page_size;
+ gchar *page_label;
+
+ _ev_document_get_page_size (document, page, &page_width, &page_height);
+
+ if (i == 0) {
+ priv->uniform_width = page_width;
+ priv->uniform_height = page_height;
+ priv->max_width = priv->uniform_width;
+ priv->max_height = priv->uniform_height;
+ priv->min_width = priv->uniform_width;
+ priv->min_height = priv->uniform_height;
+ } else if (priv->uniform &&
+ (priv->uniform_width != page_width ||
+ priv->uniform_height != page_height)) {
+ /* It's a different page size. Backfill the array. */
+ int j;
+
+ priv->page_sizes = g_new0 (EvPageSize, priv->n_pages);
+
+ for (j = 0; j < i; j++) {
+ page_size = &(priv->page_sizes[j]);
+ page_size->width = priv->uniform_width;
+ page_size->height = priv->uniform_height;
+ }
+ priv->uniform = FALSE;
+ }
+ if (!priv->uniform) {
+ page_size = &(priv->page_sizes[i]);
+
+ page_size->width = page_width;
+ page_size->height = page_height;
+
+ if (page_width > priv->max_width)
+ priv->max_width = page_width;
+ if (page_width < priv->min_width)
+ priv->min_width = page_width;
+
+ if (page_height > priv->max_height)
+ priv->max_height = page_height;
+ if (page_height < priv->min_height)
+ priv->min_height = page_height;
+ }
+
+ page_label = _ev_document_get_page_label (document, page);
+ if (page_label) {
+ if (!priv->page_labels)
+ priv->page_labels = g_new0 (gchar *, priv->n_pages);
+
+ priv->page_labels[i] = page_label;
+ priv->max_label = MAX (priv->max_label,
+ g_utf8_strlen (page_label, 256));
+ }
+
+ g_object_unref (page);
+ }
+
+ priv->info = _ev_document_get_info (document);
+ if (_ev_document_support_synctex (document)) {
+ gchar *filename;
+
+ filename = g_filename_from_uri (uri, NULL, NULL);
+ if (filename != NULL) {
+ priv->synctex_scanner =
+ synctex_scanner_new_with_output_file (filename, NULL, 1);
+ g_free (filename);
+ }
+ }
+ }
return retval;
}
+/**
+ * ev_document_save:
+ * @document:
+ * @uri: the target URI
+ * @error: a #GError location to store an error, or %NULL
+ *
+ * Saves @document to @uri.
+ *
+ * Returns: %TRUE on success, or %FALSE on error with @error filled in
+ */
gboolean
ev_document_save (EvDocument *document,
const char *uri,
GError **error)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
- gboolean retval;
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
- retval = iface->save (document, uri, error);
+ return klass->save (document, uri, error);
+}
- return retval;
+EvPage *
+ev_document_get_page (EvDocument *document,
+ gint index)
+{
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
+
+ return klass->get_page (document, index);
}
-int
-ev_document_get_n_pages (EvDocument *document)
+static gboolean
+_ev_document_support_synctex (EvDocument *document)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
- gint retval;
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
- retval = iface->get_n_pages (document);
+ return klass->support_synctex ? klass->support_synctex (document) : FALSE;
+}
- return retval;
+gboolean
+ev_document_has_synctex (EvDocument *document)
+{
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
+
+ return document->priv->synctex_scanner != NULL;
}
-EvPage *
-ev_document_get_page (EvDocument *document,
- gint index)
+/**
+ * ev_document_synctex_backward_search:
+ * @document:
+ * @page: the target page
+ * @x:
+ * @y:
+ *
+ * Peforms a Synctex backward search to obtain the TeX input file, line and
+ * (possibly) column corresponding to the position (@x,@y) (in 72dpi
+ * coordinates) in the @page of @document.
+ *
+ * Returns: A pointer to the EvSourceLink structure that holds the result. @NULL if synctex
+ * is not enabled for the document or no result is found.
+ * The EvSourceLink pointer should be freed with g_free after it is used.
+ */
+EvSourceLink *
+ev_document_synctex_backward_search (EvDocument *document,
+ gint page_index,
+ gfloat x,
+ gfloat y)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
- EvPage *retval;
+ EvSourceLink *result = NULL;
+ synctex_scanner_t scanner;
+
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
+
+ scanner = document->priv->synctex_scanner;
+ if (!scanner)
+ return NULL;
+
+ if (synctex_edit_query (scanner, page_index + 1, x, y) > 0) {
+ synctex_node_t node;
+
+ /* We assume that a backward search returns either zero or one result_node */
+ node = synctex_next_result (scanner);
+ if (node != NULL) {
+ const gchar *filename;
+
+ filename = synctex_scanner_get_name (scanner, synctex_node_tag (node));
+
+ if (filename) {
+ result = g_new (EvSourceLink, 1);
+ result->filename = filename;
+ result->line = synctex_node_line (node);
+ result->col = synctex_node_column (node);
+ }
+ }
+ }
+
+ return result;
+}
- if (iface->get_page)
- retval = iface->get_page (document, index);
- else
- retval = ev_page_new (index);
+/**
+ * ev_document_synctex_forward_search:
+ * @document:
+ * @source_link:
+ *
+ * Peforms a Synctex forward search to obtain the area in the document
+ * corresponding to the position @line and @column number in the source Tex file
+ *
+ * Returns: An EvMapping with the page number and area corresponfing to
+ * the given line in the source file. It must be free with g_free when done
+ */
+EvMapping *
+ev_document_synctex_forward_search (EvDocument *document,
+ EvSourceLink *link)
+{
+ EvMapping *result = NULL;
+ synctex_scanner_t scanner;
- return retval;
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
+
+ scanner = document->priv->synctex_scanner;
+ if (!scanner)
+ return NULL;
+
+ if (synctex_display_query (scanner, link->filename, link->line, link->col) > 0) {
+ synctex_node_t node;
+ gint page;
+
+ if ((node = synctex_next_result (scanner))) {
+ result = g_new (EvMapping, 1);
+
+ page = synctex_node_page (node) - 1;
+ result->data = GINT_TO_POINTER (page);
+
+ result->area.x1 = synctex_node_box_visible_h (node);
+ result->area.y1 = synctex_node_box_visible_v (node) -
+ synctex_node_box_visible_height (node);
+ result->area.x2 = synctex_node_box_visible_width (node) + result->area.x1;
+ result->area.y2 = synctex_node_box_visible_depth (node) +
+ synctex_node_box_visible_height (node) + result->area.y1;
+ }
+ }
+
+ return result;
+}
+
+static gint
+_ev_document_get_n_pages (EvDocument *document)
+{
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
+
+ return klass->get_n_pages (document);
+}
+
+gint
+ev_document_get_n_pages (EvDocument *document)
+{
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), 0);
+
+ return document->priv->n_pages;
+}
+
+static void
+_ev_document_get_page_size (EvDocument *document,
+ EvPage *page,
+ double *width,
+ double *height)
+{
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
+
+ klass->get_page_size (document, page, width, height);
}
void
ev_document_get_page_size (EvDocument *document,
- EvPage *page,
+ gint page_index,
double *width,
double *height)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
+ g_return_if_fail (EV_IS_DOCUMENT (document));
+ g_return_if_fail (page_index >= 0 || page_index < document->priv->n_pages);
+
+ if (width)
+ *width = document->priv->uniform ?
+ document->priv->uniform_width :
+ document->priv->page_sizes[page_index].width;
+ if (height)
+ *height = document->priv->uniform ?
+ document->priv->uniform_height :
+ document->priv->page_sizes[page_index].height;
+}
- iface->get_page_size (document, page, width, height);
+static gchar *
+_ev_document_get_page_label (EvDocument *document,
+ EvPage *page)
+{
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
+
+ return klass->get_page_label ?
+ klass->get_page_label (document, page) : NULL;
}
-char *
+gchar *
ev_document_get_page_label (EvDocument *document,
- EvPage *page)
+ gint page_index)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
+ g_return_val_if_fail (page_index >= 0 || page_index < document->priv->n_pages, NULL);
- if (iface->get_page_label == NULL)
- return NULL;
+ return (document->priv->page_labels && document->priv->page_labels[page_index]) ?
+ g_strdup (document->priv->page_labels[page_index]) :
+ g_strdup_printf ("%d", page_index + 1);
+}
- return iface->get_page_label (document, page);
+static EvDocumentInfo *
+_ev_document_get_info (EvDocument *document)
+{
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
+
+ return klass->get_info (document);
}
EvDocumentInfo *
ev_document_get_info (EvDocument *document)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
- return iface->get_info (document);
+ return document->priv->info;
}
gboolean
-ev_document_has_attachments (EvDocument *document)
+ev_document_get_backend_info (EvDocument *document, EvDocumentBackendInfo *info)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
- if (iface->has_attachments == NULL)
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
+ if (klass->get_backend_info == NULL)
return FALSE;
-
- return iface->has_attachments (document);
+
+ return klass->get_backend_info (document, info);
}
-GList *
-ev_document_get_attachments (EvDocument *document)
+cairo_surface_t *
+ev_document_render (EvDocument *document,
+ EvRenderContext *rc)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
- GList *retval;
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
- if (iface->get_attachments == NULL)
- return NULL;
- retval = iface->get_attachments (document);
+ return klass->render (document, rc);
+}
- return retval;
+static GdkPixbuf *
+_ev_document_get_thumbnail (EvDocument *document,
+ EvRenderContext *rc)
+{
+ cairo_surface_t *surface;
+ GdkPixbuf *pixbuf;
+
+ surface = ev_document_render (document, rc);
+ pixbuf = ev_document_misc_pixbuf_from_surface (surface);
+ cairo_surface_destroy (surface);
+
+ return pixbuf;
}
-cairo_surface_t *
-ev_document_render (EvDocument *document,
- EvRenderContext *rc)
+GdkPixbuf *
+ev_document_get_thumbnail (EvDocument *document,
+ EvRenderContext *rc)
{
- EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
- cairo_surface_t *retval;
+ EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
- g_assert (iface->render);
+ if (klass->get_thumbnail)
+ return klass->get_thumbnail (document, rc);
- retval = iface->render (document, rc);
+ return _ev_document_get_thumbnail (document, rc);
+}
- return retval;
+const gchar *
+ev_document_get_uri (EvDocument *document)
+{
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
+
+ return document->priv->uri;
+}
+
+const gchar *
+ev_document_get_title (EvDocument *document)
+{
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
+
+ return (document->priv->info->fields_mask & EV_DOCUMENT_INFO_TITLE) ?
+ document->priv->info->title : NULL;
+}
+
+gboolean
+ev_document_is_page_size_uniform (EvDocument *document)
+{
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), TRUE);
+
+ return document->priv->uniform;
+}
+
+void
+ev_document_get_max_page_size (EvDocument *document,
+ gdouble *width,
+ gdouble *height)
+{
+ g_return_if_fail (EV_IS_DOCUMENT (document));
+
+ if (width)
+ *width = document->priv->max_width;
+ if (height)
+ *height = document->priv->max_height;
+}
+
+void
+ev_document_get_min_page_size (EvDocument *document,
+ gdouble *width,
+ gdouble *height)
+{
+ g_return_if_fail (EV_IS_DOCUMENT (document));
+
+ if (width)
+ *width = document->priv->min_width;
+ if (height)
+ *height = document->priv->min_height;
+}
+
+gboolean
+ev_document_check_dimensions (EvDocument *document)
+{
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
+
+ return (document->priv->max_width > 0 && document->priv->max_height > 0);
+}
+
+gint
+ev_document_get_max_label_len (EvDocument *document)
+{
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), -1);
+
+ return document->priv->max_label;
+}
+
+gboolean
+ev_document_has_text_page_labels (EvDocument *document)
+{
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
+
+ return document->priv->page_labels != NULL;
+}
+
+gboolean
+ev_document_find_page_by_label (EvDocument *document,
+ const gchar *page_label,
+ gint *page_index)
+{
+ gint i, page;
+ glong value;
+ gchar *endptr = NULL;
+ EvDocumentPrivate *priv = document->priv;
+
+ g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
+ g_return_val_if_fail (page_label != NULL, FALSE);
+ g_return_val_if_fail (page_index != NULL, FALSE);
+
+ /* First, look for a literal label match */
+ for (i = 0; priv->page_labels && i < priv->n_pages; i ++) {
+ if (priv->page_labels[i] != NULL &&
+ ! strcmp (page_label, priv->page_labels[i])) {
+ *page_index = i;
+ return TRUE;
+ }
+ }
+
+ /* Second, look for a match with case insensitively */
+ for (i = 0; priv->page_labels && i < priv->n_pages; i++) {
+ if (priv->page_labels[i] != NULL &&
+ ! strcasecmp (page_label, priv->page_labels[i])) {
+ *page_index = i;
+ return TRUE;
+ }
+ }
+
+ /* Next, parse the label, and see if the number fits */
+ value = strtol (page_label, &endptr, 10);
+ if (endptr[0] == '\0') {
+ /* Page number is an integer */
+ page = MIN (G_MAXINT, value);
+
+ /* convert from a page label to a page offset */
+ page --;
+ if (page >= 0 && page < priv->n_pages) {
+ *page_index = page;
+ return TRUE;
+ }
+ }
+
+ return FALSE;
}
/* EvDocumentInfo */
copy->ui_hints = info->ui_hints;
copy->permissions = info->permissions;
copy->n_pages = info->n_pages;
+ copy->license = ev_document_license_copy (info->license);
+
copy->fields_mask = info->fields_mask;
return copy;
g_free (info->producer);
g_free (info->linearized);
g_free (info->security);
-
+ ev_document_license_free (info->license);
+
g_free (info);
}
+/* EvDocumentLicense */
+EV_DEFINE_BOXED_TYPE (EvDocumentLicense, ev_document_license, ev_document_license_copy, ev_document_license_free)
+
+EvDocumentLicense *
+ev_document_license_new (void)
+{
+ return g_new0 (EvDocumentLicense, 1);
+}
+
+EvDocumentLicense *
+ev_document_license_copy (EvDocumentLicense *license)
+{
+ EvDocumentLicense *new_license;
+
+ if (!license)
+ return NULL;
+
+ new_license = ev_document_license_new ();
+
+ if (license->text)
+ new_license->text = g_strdup (license->text);
+ if (license->uri)
+ new_license->uri = g_strdup (license->uri);
+ if (license->web_statement)
+ new_license->web_statement = g_strdup (license->web_statement);
+
+ return new_license;
+}
+
+void
+ev_document_license_free (EvDocumentLicense *license)
+{
+ if (!license)
+ return;
+
+ g_free (license->text);
+ g_free (license->uri);
+ g_free (license->web_statement);
+
+ g_free (license);
+}
+
+const gchar *
+ev_document_license_get_text (EvDocumentLicense *license)
+{
+ return license->text;
+}
+
+const gchar *
+ev_document_license_get_uri (EvDocumentLicense *license)
+{
+ return license->uri;
+}
+
+const gchar *
+ev_document_license_get_web_statement (EvDocumentLicense *license)
+{
+ return license->web_statement;
+}
+
+/* EvRectangle */
+EV_DEFINE_BOXED_TYPE (EvRectangle, ev_rectangle, ev_rectangle_copy, ev_rectangle_free)
+
+EvRectangle *
+ev_rectangle_new (void)
+{
+ return g_new0 (EvRectangle, 1);
+}
+
+EvRectangle *
+ev_rectangle_copy (EvRectangle *rectangle)
+{
+ EvRectangle *new_rectangle;
+
+ g_return_val_if_fail (rectangle != NULL, NULL);
+
+ new_rectangle = g_new (EvRectangle, 1);
+ *new_rectangle = *rectangle;
+
+ return new_rectangle;
+}
+
+void
+ev_rectangle_free (EvRectangle *rectangle)
+{
+ g_free (rectangle);
+}
/* Compares two rects. returns 0 if they're equal */
#define EPSILON 0.0000001
https://www.fi.muni.cz/~kas/git / evince.git / blobdiff