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evince/libdocument/ev-document.c
Pablo Correa Gómez 273511ac39
libdocument: simplify freeing memory by better exploiting glib functions 
Mostly g_clear_object and g_clear_pointer. But also some small
simplifications depending on the context.
2023-03-24 09:58:48 +01:00

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/*
* Copyright (C) 2009 Carlos Garcia Campos
* Copyright (C) 2004 Marco Pesenti Gritti
* Copyright © 2018 Christian Persch
*
* 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 2, 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include "ev-document.h"
#include "ev-document-misc.h"
#include "synctex_parser.h"
enum {
PROP_0,
PROP_MODIFIED
};
typedef struct _EvPageSize
{
gdouble width;
gdouble height;
} EvPageSize;
struct _EvDocumentPrivate
{
gchar *uri;
guint64 file_size;
gboolean cache_loaded;
gint n_pages;
gboolean modified;
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_p synctex_scanner;
};
static guint64 _ev_document_get_size_gfile (GFile *file);
static guint64 _ev_document_get_size (const char *uri);
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);
static GMutex ev_doc_mutex;
static GMutex ev_fc_mutex;
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (EvDocument, ev_document, G_TYPE_OBJECT)
GQuark
ev_document_error_quark (void)
{
static GQuark q = 0;
if (q == 0)
q = g_quark_from_static_string ("ev-document-error-quark");
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 ev_document_info_new ();
}
static void
ev_document_finalize (GObject *object)
{
EvDocument *document = EV_DOCUMENT (object);
g_clear_pointer (&document->priv->uri, g_free);
g_clear_pointer (&document->priv->page_sizes, g_free);
g_clear_pointer (&document->priv->page_labels, g_strfreev);
g_clear_pointer (&document->priv->info, ev_document_info_free);
g_clear_pointer (&document->priv->synctex_scanner, synctex_scanner_free);
G_OBJECT_CLASS (ev_document_parent_class)->finalize (object);
}
static void
ev_document_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id) {
case PROP_MODIFIED:
ev_document_set_modified (EV_DOCUMENT (object),
g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
ev_document_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
EvDocument *document = EV_DOCUMENT (object);
switch (prop_id) {
case PROP_MODIFIED:
g_value_set_boolean (value, document->priv->modified);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
ev_document_init (EvDocument *document)
{
document->priv = ev_document_get_instance_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);
klass->get_page = ev_document_impl_get_page;
klass->get_info = ev_document_impl_get_info;
klass->get_backend_info = NULL;
g_object_class->get_property = ev_document_get_property;
g_object_class->set_property = ev_document_set_property;
g_object_class->finalize = ev_document_finalize;
g_object_class_install_property (g_object_class,
PROP_MODIFIED,
g_param_spec_boolean ("modified",
"Is modified",
"Whether the document has been modified",
FALSE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
}
/**
* ev_document_get_modified:
* @document: an #EvDocument
*
* Returns: %TRUE iff the document has been modified.
*
* You can monitor changes to the modification state by connecting to the
* notify::modified signal on @document.
*
* Since: 3.28
*/
gboolean
ev_document_get_modified (EvDocument *document)
{
g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
return document->priv->modified;
}
/**
* ev_document_set_modified:
* @document: an #EvDocument
* @modified: a boolean value to set the document as modified or not.
*
* Set the @document modification state as @modified.
*
* Since: 3.28
*/
void
ev_document_set_modified (EvDocument *document,
gboolean modified)
{
g_return_if_fail (EV_IS_DOCUMENT (document));
if (document->priv->modified != modified) {
document->priv->modified = modified;
g_object_notify (G_OBJECT (document), "modified");
}
}
void
ev_document_doc_mutex_lock (void)
{
g_mutex_lock (&ev_doc_mutex);
}
void
ev_document_doc_mutex_unlock (void)
{
g_mutex_unlock (&ev_doc_mutex);
}
gboolean
ev_document_doc_mutex_trylock (void)
{
return g_mutex_trylock (&ev_doc_mutex);
}
void
ev_document_fc_mutex_lock (void)
{
g_mutex_lock (&ev_fc_mutex);
}
void
ev_document_fc_mutex_unlock (void)
{
g_mutex_unlock (&ev_fc_mutex);
}
gboolean
ev_document_fc_mutex_trylock (void)
{
return g_mutex_trylock (&ev_fc_mutex);
}
static void
ev_document_setup_cache (EvDocument *document)
{
EvDocumentPrivate *priv = document->priv;
gboolean custom_page_labels = FALSE;
gint i;
/* Cache some info about the document to avoid
* going to the backends since it requires locks
*/
priv->cache_loaded = TRUE;
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 + 1);
if (!custom_page_labels) {
gchar *real_page_label;
real_page_label = g_strdup_printf ("%d", i + 1);
custom_page_labels = g_strcmp0 (real_page_label, page_label) != 0;
g_free (real_page_label);
}
priv->page_labels[i] = page_label;
priv->max_label = MAX (priv->max_label,
g_utf8_strlen (page_label, 256));
}
g_object_unref (page);
}
if (!custom_page_labels)
g_clear_pointer (&priv->page_labels, g_strfreev);
}
static void
ev_document_initialize_synctex (EvDocument *document,
const gchar *uri)
{
EvDocumentPrivate *priv = document->priv;
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);
}
}
}
/**
* ev_document_load_full:
* @document: a #EvDocument
* @uri: the document's URI
* @flags: flags from #EvDocumentLoadFlags
* @error: a #GError location to store an error, or %NULL
*
* Loads @document from @uri.
*
* 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.
*/
gboolean
ev_document_load_full (EvDocument *document,
const char *uri,
EvDocumentLoadFlags flags,
GError **error)
{
EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
gboolean retval;
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 {
document->priv->info = _ev_document_get_info (document);
document->priv->n_pages = _ev_document_get_n_pages (document);
if (!(flags & EV_DOCUMENT_LOAD_FLAG_NO_CACHE))
ev_document_setup_cache (document);
document->priv->uri = g_strdup (uri);
document->priv->file_size = _ev_document_get_size (uri);
ev_document_initialize_synctex (document, uri);
}
return retval;
}
/**
* ev_document_load:
* @document: a #EvDocument
* @uri: the document's URI
* @error: a #GError location to store an error, or %NULL
*
* Loads @document from @uri.
*
* 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. If the backend does not support the format for the document's
* contents, EV_DOCUMENT_ERROR_UNSUPPORTED_CONTENT 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.
*/
gboolean
ev_document_load (EvDocument *document,
const char *uri,
GError **error)
{
return ev_document_load_full (document, uri,
EV_DOCUMENT_LOAD_FLAG_NONE, error);
}
/**
* ev_document_load_stream:
* @document: a #EvDocument
* @stream: a #GInputStream
* @flags: flags from #EvDocumentLoadFlags
* @cancellable: (allow-none): a #GCancellable, or %NULL
* @error: (allow-none): a #GError location to store an error, or %NULL
*
* Synchronously loads the document from @stream.
* See ev_document_load() for more information.
*
* Returns: %TRUE if loading succeeded, or %FALSE on error with @error filled in
*
* Since: 3.6
*/
gboolean
ev_document_load_stream (EvDocument *document,
GInputStream *stream,
EvDocumentLoadFlags flags,
GCancellable *cancellable,
GError **error)
{
EvDocumentClass *klass;
g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
g_return_val_if_fail (G_IS_INPUT_STREAM (stream), FALSE);
g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
klass = EV_DOCUMENT_GET_CLASS (document);
if (!klass->load_stream) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
"Backend does not support loading from stream");
return FALSE;
}
if (!klass->load_stream (document, stream, flags, cancellable, error))
return FALSE;
document->priv->info = _ev_document_get_info (document);
document->priv->n_pages = _ev_document_get_n_pages (document);
if (!(flags & EV_DOCUMENT_LOAD_FLAG_NO_CACHE))
ev_document_setup_cache (document);
return TRUE;
}
/**
* ev_document_load_gfile:
* @document: a #EvDocument
* @file: a #GFile
* @flags: flags from #EvDocumentLoadFlags
* @cancellable: (allow-none): a #GCancellable, or %NULL
* @error: (allow-none): a #GError location to store an error, or %NULL
*
* Synchronously loads the document from @file.
* See ev_document_load() for more information.
*
* Returns: %TRUE if loading succeeded, or %FALSE on error with @error filled in
*
* Since: 3.6
*/
gboolean
ev_document_load_gfile (EvDocument *document,
GFile *file,
EvDocumentLoadFlags flags,
GCancellable *cancellable,
GError **error)
{
EvDocumentClass *klass;
g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
klass = EV_DOCUMENT_GET_CLASS (document);
if (!klass->load_gfile) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
"Backend does not support loading from GFile");
return FALSE;
}
if (!klass->load_gfile (document, file, flags, cancellable, error))
return FALSE;
document->priv->info = _ev_document_get_info (document);
document->priv->n_pages = _ev_document_get_n_pages (document);
if (!(flags & EV_DOCUMENT_LOAD_FLAG_NO_CACHE))
ev_document_setup_cache (document);
document->priv->uri = g_file_get_uri (file);
document->priv->file_size = _ev_document_get_size_gfile (file);
ev_document_initialize_synctex (document, document->priv->uri);
return TRUE;
}
/**
* ev_document_load_fd:
* @document: a #EvDocument
* @fd: a file descriptor
* @flags: flags from #EvDocumentLoadFlags
* @cancellable: (allow-none): a #GCancellable, or %NULL
* @error: (allow-none): a #GError location to store an error, or %NULL
*
* Synchronously loads the document from @fd, which must refer to
* a regular file.
*
* Note that this function takes ownership of @fd; you must not ever
* operate on it again. It will be closed automatically if the document
* is destroyed, or if this function returns %NULL.
*
* See ev_document_load() for more information.
*
* Returns: %TRUE if loading succeeded, or %FALSE on error with @error filled in
*
* Since: 42.0
*/
gboolean
ev_document_load_fd (EvDocument *document,
int fd,
EvDocumentLoadFlags flags,
GCancellable *cancellable,
GError **error)
{
EvDocumentClass *klass;
struct stat statbuf;
int fd_flags;
g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
g_return_val_if_fail (fd != -1, FALSE);
g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
klass = EV_DOCUMENT_GET_CLASS (document);
if (!klass->load_fd) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
"Backend does not support loading from file descriptor");
close (fd);
return FALSE;
}
if (fstat(fd, &statbuf) == -1 ||
(fd_flags = fcntl (fd, F_GETFL, &flags)) == -1) {
int errsv = errno;
g_set_error_literal (error, G_FILE_ERROR,
g_file_error_from_errno (errsv),
g_strerror (errsv));
close (fd);
return FALSE;
}
if (!S_ISREG(statbuf.st_mode)) {
g_set_error_literal (error, G_FILE_ERROR, G_FILE_ERROR_BADF,
"Not a regular file.");
close (fd);
return FALSE;
}
switch (fd_flags & O_ACCMODE) {
case O_RDONLY:
case O_RDWR:
break;
case O_WRONLY:
default:
g_set_error_literal (error, G_FILE_ERROR, G_FILE_ERROR_BADF,
"Not a readable file descriptor.");
close (fd);
return FALSE;
}
if (!klass->load_fd (document, fd, flags, cancellable, error))
return FALSE;
document->priv->info = _ev_document_get_info (document);
document->priv->n_pages = _ev_document_get_n_pages (document);
if (!(flags & EV_DOCUMENT_LOAD_FLAG_NO_CACHE))
ev_document_setup_cache (document);
return TRUE;
}
/**
* ev_document_save:
* @document: a #EvDocument
* @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)
{
EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
return klass->save (document, uri, error);
}
/**
* ev_document_get_page:
* @document: a #EvDocument
* @index: index of page
*
* Returns: (transfer full): Newly created #EvPage for the given index.
*/
EvPage *
ev_document_get_page (EvDocument *document,
gint index)
{
EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
return klass->get_page (document, index);
}
static gboolean
_ev_document_support_synctex (EvDocument *document)
{
EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
return klass->support_synctex ? klass->support_synctex (document) : FALSE;
}
gboolean
ev_document_has_synctex (EvDocument *document)
{
g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
return document->priv->synctex_scanner != NULL;
}
/**
* ev_document_synctex_backward_search:
* @document: a #EvDocument
* @page_index: the target page
* @x: X coordinate
* @y: Y coordinate
*
* 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)
{
EvSourceLink *result = NULL;
synctex_scanner_p 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_p node;
/* We assume that a backward search returns either zero or one result_node */
node = synctex_scanner_next_result (scanner);
if (node != NULL) {
const gchar *filename;
filename = synctex_scanner_get_name (scanner, synctex_node_tag (node));
if (filename) {
result = ev_source_link_new (filename,
synctex_node_line (node),
synctex_node_column (node));
}
}
}
return result;
}
/**
* ev_document_synctex_forward_search: (skip)
* @document: a #EvDocument
* @source_link: a #EvSourceLink
*
* Peforms a Synctex forward search to obtain the area in the document
* corresponding to the position (line and column in @source_link) in
* the source Tex file.
*
* Returns: An EvMapping with the page number and area corresponding 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_p scanner;
g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
scanner = document->priv->synctex_scanner;
if (!scanner)
return NULL;
/* Since 1.19, synctex_display_query has a fourth parameter,
* page-hint, which we set into a dummy number to not break the
* API. In synctex it is used to set the best results first
* given the page-hint
*/
if (synctex_display_query (scanner, link->filename, link->line, link->col, 0) > 0) {
synctex_node_p node;
gint page;
if ((node = synctex_scanner_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 guint64
_ev_document_get_size_gfile (GFile *file)
{
goffset size = 0;
GFileInfo *info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_SIZE,
G_FILE_QUERY_INFO_NONE, NULL, NULL);
if (info) {
size = g_file_info_get_size (info);
g_object_unref (info);
}
return size;
}
static guint64
_ev_document_get_size (const char *uri)
{
GFile *file = g_file_new_for_uri (uri);
guint64 size = _ev_document_get_size_gfile (file);
g_object_unref (file);
return size;
}
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);
}
/**
* ev_document_get_page_size:
* @document: a #EvDocument
* @page_index: index of page
* @width: (out) (allow-none): return location for the width of the page, or %NULL
* @height: (out) (allow-none): return location for the height of the page, or %NULL
*/
void
ev_document_get_page_size (EvDocument *document,
gint page_index,
double *width,
double *height)
{
EvDocumentPrivate *priv;
g_return_if_fail (EV_IS_DOCUMENT (document));
g_return_if_fail (page_index >= 0 || page_index < document->priv->n_pages);
priv = document->priv;
if (priv->cache_loaded) {
if (width)
*width = priv->uniform ?
priv->uniform_width :
priv->page_sizes[page_index].width;
if (height)
*height = priv->uniform ?
priv->uniform_height :
priv->page_sizes[page_index].height;
} else {
EvPage *page;
g_mutex_lock (&ev_doc_mutex);
page = ev_document_get_page (document, page_index);
_ev_document_get_page_size (document, page, width, height);
g_object_unref (page);
g_mutex_unlock (&ev_doc_mutex);
}
}
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;
}
gchar *
ev_document_get_page_label (EvDocument *document,
gint page_index)
{
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 (!document->priv->cache_loaded) {
EvPage *page;
gchar *page_label;
g_mutex_lock (&ev_doc_mutex);
page = ev_document_get_page (document, page_index);
page_label = _ev_document_get_page_label (document, page);
g_object_unref (page);
g_mutex_unlock (&ev_doc_mutex);
return page_label ? page_label : g_strdup_printf ("%d", page_index + 1);
}
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);
}
static EvDocumentInfo *
_ev_document_get_info (EvDocument *document)
{
EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
return klass->get_info (document);
}
/**
* ev_document_get_info:
* @document: a #EvDocument
*
* Returns the #EvDocumentInfo for the document.
*
* Returns: (transfer none): a #EvDocumentInfo
*/
EvDocumentInfo *
ev_document_get_info (EvDocument *document)
{
g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
return document->priv->info;
}
gboolean
ev_document_get_backend_info (EvDocument *document, EvDocumentBackendInfo *info)
{
EvDocumentClass *klass;
g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
klass = EV_DOCUMENT_GET_CLASS (document);
if (klass->get_backend_info == NULL)
return FALSE;
return klass->get_backend_info (document, info);
}
cairo_surface_t *
ev_document_render (EvDocument *document,
EvRenderContext *rc)
{
EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
return klass->render (document, rc);
}
static GdkPixbuf *
_ev_document_get_thumbnail (EvDocument *document,
EvRenderContext *rc)
{
cairo_surface_t *surface;
GdkPixbuf *pixbuf = NULL;
surface = ev_document_render (document, rc);
if (surface != NULL) {
pixbuf = ev_document_misc_pixbuf_from_surface (surface);
cairo_surface_destroy (surface);
}
return pixbuf;
}
/**
* ev_document_get_thumbnail:
* @document: an #EvDocument
* @rc: an #EvRenderContext
*
* Returns: (transfer full): a #GdkPixbuf
*/
GdkPixbuf *
ev_document_get_thumbnail (EvDocument *document,
EvRenderContext *rc)
{
EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
if (klass->get_thumbnail)
return klass->get_thumbnail (document, rc);
return _ev_document_get_thumbnail (document, rc);
}
/**
* ev_document_get_thumbnail_surface:
* @document: an #EvDocument
* @rc: an #EvRenderContext
*
* Returns: (transfer full): a #cairo_surface_t
*
* Since: 3.14
*/
cairo_surface_t *
ev_document_get_thumbnail_surface (EvDocument *document,
EvRenderContext *rc)
{
EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
if (klass->get_thumbnail_surface)
return klass->get_thumbnail_surface (document, rc);
return ev_document_render (document, rc);
}
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);
if (!document->priv->cache_loaded) {
g_mutex_lock (&ev_doc_mutex);
ev_document_setup_cache (document);
g_mutex_unlock (&ev_doc_mutex);
}
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 (!document->priv->cache_loaded) {
g_mutex_lock (&ev_doc_mutex);
ev_document_setup_cache (document);
g_mutex_unlock (&ev_doc_mutex);
}
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 (!document->priv->cache_loaded) {
g_mutex_lock (&ev_doc_mutex);
ev_document_setup_cache (document);
g_mutex_unlock (&ev_doc_mutex);
}
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);
if (!document->priv->cache_loaded) {
g_mutex_lock (&ev_doc_mutex);
ev_document_setup_cache (document);
g_mutex_unlock (&ev_doc_mutex);
}
return (document->priv->max_width > 0 && document->priv->max_height > 0);
}
guint64
ev_document_get_size (EvDocument *document)
{
g_return_val_if_fail (EV_IS_DOCUMENT (document), 0);
return document->priv->file_size;
}
gint
ev_document_get_max_label_len (EvDocument *document)
{
g_return_val_if_fail (EV_IS_DOCUMENT (document), -1);
if (!document->priv->cache_loaded) {
g_mutex_lock (&ev_doc_mutex);
ev_document_setup_cache (document);
g_mutex_unlock (&ev_doc_mutex);
}
return document->priv->max_label;
}
gboolean
ev_document_has_text_page_labels (EvDocument *document)
{
g_return_val_if_fail (EV_IS_DOCUMENT (document), FALSE);
if (!document->priv->cache_loaded) {
g_mutex_lock (&ev_doc_mutex);
ev_document_setup_cache (document);
g_mutex_unlock (&ev_doc_mutex);
}
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);
if (!document->priv->cache_loaded) {
g_mutex_lock (&ev_doc_mutex);
ev_document_setup_cache (document);
g_mutex_unlock (&ev_doc_mutex);
}
/* 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;
}
/* EvSourceLink */
G_DEFINE_BOXED_TYPE (EvSourceLink, ev_source_link, ev_source_link_copy, ev_source_link_free)
EvSourceLink *
ev_source_link_new (const gchar *filename,
gint line,
gint col)
{
EvSourceLink *link = g_slice_new (EvSourceLink);
link->filename = g_strdup (filename);
link->line = line;
link->col = col;
return link;
}
EvSourceLink *
ev_source_link_copy (EvSourceLink *link)
{
EvSourceLink *copy;
g_return_val_if_fail (link != NULL, NULL);
copy = g_slice_new (EvSourceLink);
*copy = *link;
copy->filename = g_strdup (link->filename);
return copy;
}
void
ev_source_link_free (EvSourceLink *link)
{
if (link == NULL)
return;
g_free (link->filename);
g_slice_free (EvSourceLink, link);
}
/* EvRectangle */
G_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
gint
ev_rect_cmp (EvRectangle *a,
EvRectangle *b)
{
if (a == b)
return 0;
if (a == NULL || b == NULL)
return 1;
return ! ((ABS (a->x1 - b->x1) < EPSILON) &&
(ABS (a->y1 - b->y1) < EPSILON) &&
(ABS (a->x2 - b->x2) < EPSILON) &&
(ABS (a->y2 - b->y2) < EPSILON));
}
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