diff options
Diffstat (limited to 'backend/dvi/dvi-document.c')
| -rw-r--r-- | backend/dvi/dvi-document.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/backend/dvi/dvi-document.c b/backend/dvi/dvi-document.c new file mode 100644 index 0000000..4de5e64 --- /dev/null +++ b/backend/dvi/dvi-document.c @@ -0,0 +1,376 @@ +/* -*- 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 <config.h> + +#include "dvi-document.h" +#include "ev-document-thumbnails.h" +#include "ev-document-misc.h" + +#include "mdvi.h" +#include "fonts.h" +#include "pixbuf-device.h" + +#include <gtk/gtk.h> +#include <glib/gi18n.h> + +GMutex *dvi_context_mutex = NULL; + +enum { + PROP_0, + PROP_TITLE +}; + +struct _DviDocumentClass +{ + GObjectClass parent_class; +}; + +struct _DviDocument +{ + GObject parent_instance; + + DviContext *context; + DviPageSpec *spec; + DviParams *params; + + /* To let document scale we should remember width and height */ + + double base_width; + double base_height; + + gchar *uri; +}; + +typedef struct _DviDocumentClass DviDocumentClass; + +static void dvi_document_document_iface_init (EvDocumentIface *iface); +static void dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface); +static void dvi_document_get_page_size (EvDocument *document, + int page, + double *width, + double *height); + +G_DEFINE_TYPE_WITH_CODE + (DviDocument, dvi_document, G_TYPE_OBJECT, + { + G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, dvi_document_document_iface_init); + G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init) + }); + +static gboolean +dvi_document_load (EvDocument *document, + const char *uri, + GError **error) +{ + gchar *filename; + DviDocument *dvi_document = DVI_DOCUMENT(document); + + filename = g_filename_from_uri (uri, NULL, error); + + if (!filename) { + g_set_error (error, + EV_DOCUMENT_ERROR, + EV_DOCUMENT_ERROR_INVALID, + _("File not available")); + return FALSE; + } + + g_mutex_lock (dvi_context_mutex); + if (dvi_document->context) + mdvi_destroy_context (dvi_document->context); + + dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename); + g_mutex_unlock (dvi_context_mutex); + + if (!dvi_document->context) { + g_set_error (error, + EV_DOCUMENT_ERROR, + EV_DOCUMENT_ERROR_INVALID, + _("DVI document has incorrect format")); + return FALSE; + } + + mdvi_pixbuf_device_init (&dvi_document->context->device); + + dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv + + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink; + + dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv + + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink; + + g_free (dvi_document->uri); + dvi_document->uri = g_strdup (uri); + + return TRUE; +} + + +static gboolean +dvi_document_save (EvDocument *document, + const char *uri, + GError **error) +{ + DviDocument *dvi_document = DVI_DOCUMENT (document); + + return ev_xfer_uri_simple (dvi_document->uri, uri, error); +} + +static int +dvi_document_get_n_pages (EvDocument *document) +{ + DviDocument *dvi_document = DVI_DOCUMENT (document); + return dvi_document->context->npages; +} + +static void +dvi_document_get_page_size (EvDocument *document, + int page, + double *width, + double *height) +{ + DviDocument * dvi_document = DVI_DOCUMENT (document); + + *width = dvi_document->base_width; + *height = dvi_document->base_height;; + + return; +} + +static GdkPixbuf * +dvi_document_render_pixbuf (EvDocument *document, + EvRenderContext *rc) +{ + GdkPixbuf *pixbuf; + GdkPixbuf *rotated_pixbuf; + + DviDocument *dvi_document = DVI_DOCUMENT(document); + + gint required_width, required_height; + gint proposed_width, proposed_height; + gint xmargin = 0, ymargin = 0; + + /* We should protect our context since it's not + * thread safe. The work to the future - + * let context render page independently + */ + g_mutex_lock (dvi_context_mutex); + + mdvi_setpage(dvi_document->context, rc->page); + + mdvi_set_shrink (dvi_document->context, + (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1, + (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1); + + required_width = dvi_document->base_width * rc->scale; + required_height = dvi_document->base_height * rc->scale; + proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv; + proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv; + + if (required_width >= proposed_width) + xmargin = (required_width - proposed_width) / 2; + if (required_height >= proposed_height) + ymargin = (required_height - proposed_height) / 2; + + mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin); + + mdvi_pixbuf_device_render (dvi_document->context); + + pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device); + + g_mutex_unlock (dvi_context_mutex); + + rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation); + g_object_unref (pixbuf); + + return rotated_pixbuf; +} + +static void +dvi_document_finalize (GObject *object) +{ + DviDocument *dvi_document = DVI_DOCUMENT(object); + + g_mutex_lock (dvi_context_mutex); + if (dvi_document->context) + { + mdvi_pixbuf_device_free (&dvi_document->context->device); + mdvi_destroy_context (dvi_document->context); + } + g_mutex_unlock (dvi_context_mutex); + + if (dvi_document->params) + g_free (dvi_document->params); + + g_free (dvi_document->uri); + + G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object); +} + + +static void +dvi_document_class_init (DviDocumentClass *klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + + gobject_class->finalize = dvi_document_finalize; + + mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI); + mdvi_register_fonts (); + + dvi_context_mutex = g_mutex_new (); +} + +static gboolean +dvi_document_can_get_text (EvDocument *document) +{ + return FALSE; +} + +static EvDocumentInfo * +dvi_document_get_info (EvDocument *document) +{ + EvDocumentInfo *info; + + info = g_new0 (EvDocumentInfo, 1); + + return info; +} + +static void +dvi_document_document_iface_init (EvDocumentIface *iface) +{ + iface->load = dvi_document_load; + iface->save = dvi_document_save; + iface->can_get_text = dvi_document_can_get_text; + iface->get_n_pages = dvi_document_get_n_pages; + iface->get_page_size = dvi_document_get_page_size; + iface->render_pixbuf = dvi_document_render_pixbuf; + iface->get_info = dvi_document_get_info; +} + +static void +dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document, + gint page, + gint suggested_width, + gint *width, + gint *height) +{ + DviDocument *dvi_document = DVI_DOCUMENT (document); + gdouble page_ratio; + + page_ratio = dvi_document->base_height / dvi_document->base_width; + *width = suggested_width; + *height = (gint) (suggested_width * page_ratio); + + return; +} + +static GdkPixbuf * +dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document, + gint page, + gint rotation, + gint width, + gboolean border) +{ + DviDocument *dvi_document = DVI_DOCUMENT (document); + GdkPixbuf *pixbuf; + GdkPixbuf *border_pixbuf; + GdkPixbuf *rotated_pixbuf; + gint thumb_width, thumb_height; + gint proposed_width, proposed_height; + + dvi_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height); + + g_mutex_lock (dvi_context_mutex); + + mdvi_setpage(dvi_document->context, page); + + mdvi_set_shrink (dvi_document->context, + (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width, + (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height); + + proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv; + proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv; + + if (border) { + mdvi_pixbuf_device_set_margins (&dvi_document->context->device, + MAX (thumb_width - proposed_width, 0) / 2, + MAX (thumb_height - proposed_height, 0) / 2); + } else { + mdvi_pixbuf_device_set_margins (&dvi_document->context->device, + MAX (thumb_width - proposed_width - 2, 0) / 2, + MAX (thumb_height - proposed_height - 2, 0) / 2); + } + + + mdvi_pixbuf_device_render (dvi_document->context); + pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device); + + g_mutex_unlock (dvi_context_mutex); + + 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 +dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface) +{ + iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail; + iface->get_dimensions = dvi_document_thumbnails_get_dimensions; +} + + +static void +dvi_document_init_params (DviDocument *dvi_document) +{ + dvi_document->params = g_new0 (DviParams, 1); + + dvi_document->params->dpi = MDVI_DPI; + dvi_document->params->vdpi = MDVI_VDPI; + dvi_document->params->mag = MDVI_MAGNIFICATION; + dvi_document->params->density = MDVI_DEFAULT_DENSITY; + dvi_document->params->gamma = MDVI_DEFAULT_GAMMA; + dvi_document->params->flags = MDVI_PARAM_ANTIALIASED; + dvi_document->params->hdrift = 0; + dvi_document->params->vdrift = 0; + dvi_document->params->hshrink = MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi); + dvi_document->params->vshrink = MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi); + dvi_document->params->orientation = MDVI_ORIENT_TBLR; + + dvi_document->spec = NULL; + + dvi_document->params->bg = 0xffffffff; + dvi_document->params->fg = 0xff000000; +} + +static void +dvi_document_init (DviDocument *dvi_document) +{ + dvi_document->context = NULL; + dvi_document_init_params (dvi_document); +} |