diff options
Diffstat (limited to 'backend/djvu/djvu-document.c')
| -rw-r--r-- | backend/djvu/djvu-document.c | 478 |
1 files changed, 478 insertions, 0 deletions
diff --git a/backend/djvu/djvu-document.c b/backend/djvu/djvu-document.c new file mode 100644 index 0000000..ad18555 --- /dev/null +++ b/backend/djvu/djvu-document.c @@ -0,0 +1,478 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */ +/* + * Copyright (C) 2005, Nickolay V. Shmyrev <nshmyrev@yandex.ru> + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include "djvu-document.h" +#include "djvu-text.h" +#include "djvu-links.h" +#include "djvu-document-private.h" +#include "ev-document-thumbnails.h" +#include "ev-document-misc.h" +#include "ev-document-find.h" +#include "ev-document-links.h" + +#include <libdjvu/ddjvuapi.h> +#include <libdjvu/miniexp.h> +#include <gtk/gtk.h> +#include <gdk-pixbuf/gdk-pixbuf-core.h> +#include <glib/gunicode.h> +#include <string.h> + +#define SCALE_FACTOR 0.2 + +enum { + PROP_0, + PROP_TITLE +}; + +struct _DjvuDocumentClass +{ + GObjectClass parent_class; +}; + +typedef struct _DjvuDocumentClass DjvuDocumentClass; + +static void djvu_document_document_iface_init (EvDocumentIface *iface); +static void djvu_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface); +static void djvu_document_find_iface_init (EvDocumentFindIface *iface); +static void djvu_document_document_links_iface_init (EvDocumentLinksIface *iface); + +G_DEFINE_TYPE_WITH_CODE + (DjvuDocument, djvu_document, G_TYPE_OBJECT, + { + G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, djvu_document_document_iface_init); + G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, djvu_document_document_thumbnails_iface_init) + G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_FIND, djvu_document_find_iface_init); + G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_LINKS, djvu_document_document_links_iface_init); + }); + + +void +djvu_handle_events (DjvuDocument *djvu_document, int wait) +{ + ddjvu_context_t *ctx = djvu_document->d_context; + const ddjvu_message_t *msg; + if (!ctx) + return; + if (wait) + msg = ddjvu_message_wait (ctx); + while ((msg = ddjvu_message_peek (ctx))) { + switch (msg->m_any.tag) { + case DDJVU_ERROR: + g_warning ("DjvuLibre error: %s", + msg->m_error.message); + if (msg->m_error.filename) + g_warning ("DjvuLibre error: %s:%d", + msg->m_error.filename, + msg->m_error.lineno); + default: + break; + } + ddjvu_message_pop (ctx); + } +} + +static gboolean +djvu_document_load (EvDocument *document, + const char *uri, + GError **error) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + ddjvu_document_t *doc; + gchar *filename; + + /* FIXME: We could actually load uris */ + filename = g_filename_from_uri (uri, NULL, error); + if (!filename) + return FALSE; + + doc = ddjvu_document_create_by_filename (djvu_document->d_context, filename, TRUE); + + if (!doc) return FALSE; + + if (djvu_document->d_document) + ddjvu_document_release (djvu_document->d_document); + + djvu_document->d_document = doc; + + while (!ddjvu_document_decoding_done (djvu_document->d_document)) + djvu_handle_events(djvu_document, TRUE); + g_free (djvu_document->uri); + djvu_document->uri = g_strdup (uri); + + return TRUE; +} + + +static gboolean +djvu_document_save (EvDocument *document, + const char *uri, + GError **error) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + + return ev_xfer_uri_simple (djvu_document->uri, uri, error); +} + +int +djvu_document_get_n_pages (EvDocument *document) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + + g_return_val_if_fail (djvu_document->d_document, 0); + + return ddjvu_document_get_pagenum (djvu_document->d_document); +} + +static void +djvu_document_get_page_size (EvDocument *document, + int page, + double *width, + double *height) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + ddjvu_pageinfo_t info; + ddjvu_status_t r; + + g_return_if_fail (djvu_document->d_document); + + while ((r = ddjvu_document_get_pageinfo(djvu_document->d_document, page, &info)) < DDJVU_JOB_OK) + djvu_handle_events(djvu_document, TRUE); + + if (r >= DDJVU_JOB_FAILED) + djvu_handle_events(djvu_document, TRUE); + + *width = info.width * SCALE_FACTOR; + *height = info.height * SCALE_FACTOR; +} + +static GdkPixbuf * +djvu_document_render_pixbuf (EvDocument *document, + EvRenderContext *rc) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + GdkPixbuf *pixbuf; + GdkPixbuf *rotated_pixbuf; + + ddjvu_rect_t rrect; + ddjvu_rect_t prect; + ddjvu_page_t *d_page; + + double page_width, page_height; + + d_page = ddjvu_page_create_by_pageno (djvu_document->d_document, rc->page); + + while (!ddjvu_page_decoding_done (d_page)) + djvu_handle_events(djvu_document, TRUE); + + page_width = ddjvu_page_get_width (d_page) * rc->scale * SCALE_FACTOR; + page_height = ddjvu_page_get_height (d_page) * rc->scale * SCALE_FACTOR; + + pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, page_width, page_height); + + prect.x = 0; prect.y = 0; + prect.w = page_width; prect.h = page_height; + rrect = prect; + + ddjvu_page_render(d_page, DDJVU_RENDER_COLOR, + &prect, + &rrect, + djvu_document->d_format, + gdk_pixbuf_get_rowstride (pixbuf), + (gchar *)gdk_pixbuf_get_pixels (pixbuf)); + + rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation); + g_object_unref (pixbuf); + + return rotated_pixbuf; +} + +static void +djvu_document_finalize (GObject *object) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (object); + + if (djvu_document->d_document) + ddjvu_document_release (djvu_document->d_document); + + ddjvu_context_release (djvu_document->d_context); + ddjvu_format_release (djvu_document->d_format); + g_free (djvu_document->uri); + + G_OBJECT_CLASS (djvu_document_parent_class)->finalize (object); +} + +static void +djvu_document_class_init (DjvuDocumentClass *klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + + gobject_class->finalize = djvu_document_finalize; +} + +static gboolean +djvu_document_can_get_text (EvDocument *document) +{ + return TRUE; +} + + +static char * +djvu_document_get_text (EvDocument *document, int page, EvRectangle *rect) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + double width, height; + EvRectangle rectangle; + char* text; + + djvu_document_get_page_size (document, page, &width, &height); + rectangle.x1 = rect->x1 / SCALE_FACTOR; + rectangle.y1 = (height - rect->y2) / SCALE_FACTOR; + rectangle.x2 = rect->x2 / SCALE_FACTOR; + rectangle.y2 = (height - rect->y1) / SCALE_FACTOR; + + text = djvu_text_copy (djvu_document, page, &rectangle); + + if (text == NULL) + text = g_strdup (""); + + return text; +} + +static EvDocumentInfo * +djvu_document_get_info (EvDocument *document) +{ + EvDocumentInfo *info; + + info = g_new0 (EvDocumentInfo, 1); + + return info; +} + +static void +djvu_document_document_iface_init (EvDocumentIface *iface) +{ + iface->load = djvu_document_load; + iface->save = djvu_document_save; + iface->can_get_text = djvu_document_can_get_text; + iface->get_text = djvu_document_get_text; + iface->get_n_pages = djvu_document_get_n_pages; + iface->get_page_size = djvu_document_get_page_size; + iface->render_pixbuf = djvu_document_render_pixbuf; + iface->get_info = djvu_document_get_info; +} + +static void +djvu_document_thumbnails_get_dimensions (EvDocumentThumbnails *document, + gint page, + gint suggested_width, + gint *width, + gint *height) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + gdouble p_width, p_height; + gdouble page_ratio; + + djvu_document_get_page_size (EV_DOCUMENT(djvu_document), page, &p_width, &p_height); + + page_ratio = p_height / p_width; + *width = suggested_width; + *height = (gint) (suggested_width * page_ratio); + + return; +} + +static GdkPixbuf * +djvu_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document, + gint page, + gint rotation, + gint width, + gboolean border) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + GdkPixbuf *pixbuf, *rotated_pixbuf; + gint thumb_width, thumb_height; + + guchar *pixels; + + g_return_val_if_fail (djvu_document->d_document, NULL); + + djvu_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height); + + pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, + thumb_width, thumb_height); + gdk_pixbuf_fill (pixbuf, 0xffffffff); + pixels = gdk_pixbuf_get_pixels (pixbuf); + + while (ddjvu_thumbnail_status (djvu_document->d_document, page, 1) < DDJVU_JOB_OK) + djvu_handle_events(djvu_document, TRUE); + + ddjvu_thumbnail_render (djvu_document->d_document, page, + &thumb_width, &thumb_height, + djvu_document->d_format, + gdk_pixbuf_get_rowstride (pixbuf), + (gchar *)pixels); + + rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rotation); + g_object_unref (pixbuf); + + if (border) { + GdkPixbuf *tmp_pixbuf = rotated_pixbuf; + rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, 0, tmp_pixbuf); + g_object_unref (tmp_pixbuf); + } + + return rotated_pixbuf; +} + +static void +djvu_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface) +{ + iface->get_thumbnail = djvu_document_thumbnails_get_thumbnail; + iface->get_dimensions = djvu_document_thumbnails_get_dimensions; +} + +static void +djvu_document_init (DjvuDocument *djvu_document) +{ + djvu_document->d_context = ddjvu_context_create ("Evince"); + djvu_document->d_format = ddjvu_format_create (DDJVU_FORMAT_RGB24, 0, 0); + ddjvu_format_set_row_order (djvu_document->d_format,1); + + djvu_document->d_document = NULL; +} + +static void +djvu_document_find_begin (EvDocumentFind *document, + int page, + const char *search_string, + gboolean case_sensitive) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + + if (djvu_document->search && + strcmp (search_string, djvu_text_get_text (djvu_document->search)) == 0) + return; + + if (djvu_document->search) + djvu_text_free (djvu_document->search); + + djvu_document->search = djvu_text_new (djvu_document, + page, + case_sensitive, + search_string); +} + +static int +djvu_document_find_get_n_results (EvDocumentFind *document_find, int page) +{ + DjvuText *search = DJVU_DOCUMENT (document_find)->search; + + if (search) { + return djvu_text_n_results (search, page); + } else { + return 0; + } +} + +static gboolean +djvu_document_find_get_result (EvDocumentFind *document_find, + int page, + int n_result, + EvRectangle *rectangle) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document_find); + DjvuText *search = djvu_document->search; + EvRectangle *r; + double width, height; + + if (search == NULL) + return FALSE; + + r = djvu_text_get_result (search, page, n_result); + if (r == NULL) + return FALSE; + + djvu_document_get_page_size (EV_DOCUMENT (djvu_document), + page, &width, &height); + rectangle->x1 = r->x1 * SCALE_FACTOR; + rectangle->y1 = height - r->y2 * SCALE_FACTOR; + rectangle->x2 = r->x2 * SCALE_FACTOR; + rectangle->y2 = height - r->y1 * SCALE_FACTOR; + + return TRUE; +} + +static int +djvu_document_find_page_has_results (EvDocumentFind *document_find, + int page) +{ + DjvuText *search = DJVU_DOCUMENT (document_find)->search; + + return search && djvu_text_has_results (search, page); +} + +static double +djvu_document_find_get_progress (EvDocumentFind *document_find) +{ + DjvuText *search = DJVU_DOCUMENT (document_find)->search; + + if (search == NULL) { + return 0; + } + + return djvu_text_get_progress (search); +} + +static void +djvu_document_find_cancel (EvDocumentFind *document) +{ + DjvuDocument *djvu_document = DJVU_DOCUMENT (document); + + if (djvu_document->search) { + djvu_text_free (djvu_document->search); + djvu_document->search = NULL; + } +} + +static void +djvu_document_find_iface_init (EvDocumentFindIface *iface) +{ + iface->begin = djvu_document_find_begin; + iface->get_n_results = djvu_document_find_get_n_results; + iface->get_result = djvu_document_find_get_result; + iface->page_has_results = djvu_document_find_page_has_results; + iface->get_progress = djvu_document_find_get_progress; + iface->cancel = djvu_document_find_cancel; +} + +static GList * +djvu_document_links_get_links (EvDocumentLinks *document_links, + gint page) +{ + return djvu_links_get_links (document_links, page, SCALE_FACTOR); +} + +static void +djvu_document_document_links_iface_init (EvDocumentLinksIface *iface) +{ + iface->has_document_links = djvu_links_has_document_links; + iface->get_links_model = djvu_links_get_links_model; + iface->get_links = djvu_document_links_get_links; + iface->find_link_dest = djvu_links_find_link_dest; +} |