/*
 * sample-document.c
 *
 * Copyright (C) 2012, Hodong Kim <cogniti@gmail.com>
 * Copyright (C) 2009, Juanjo Marín <juanj.marin@juntadeandalucia.es>
 * Copyright (C) 2004, Red Hat, Inc.
 *
 * sample-document.c is based on ev-poppler.cc
 * http://git.gnome.org/browse/evince/tree/backend/pdf/ev-poppler.cc
 *
 * 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
 */


#include "config.h"

#define GETTEXT_PACKAGE "evince-sample-backend"
#include <glib/gi18n-lib.h>
#include <example.h>

#include "sample-document.h"

struct _SampleDocument
{
    EvDocument       parent_instance;
    ExampleDocument *document;
};

struct _SampleDocumentClass
{
    EvDocumentClass parent_class;
};

EV_BACKEND_REGISTER (SampleDocument, sample_document)

static void
sample_document_init (SampleDocument *sample_document)
{
}

static void
sample_document_dispose (GObject *object)
{
    SampleDocument *sample_document = SAMPLE_DOCUMENT (object);

    if (sample_document->document) {
        g_object_unref (sample_document->document);
        sample_document->document = NULL;
    }

    G_OBJECT_CLASS (sample_document_parent_class)->dispose (object);
}

static gboolean
sample_document_load (EvDocument *document,
                      const char *uri,
                      GError    **error)
{
    SampleDocument *sample_document = SAMPLE_DOCUMENT (document);
    sample_document->document       = example_document_new_from_uri (uri, error);

    if (!sample_document->document) {
        return FALSE;
    }

    return TRUE;
}

static gint
sample_document_get_n_pages (EvDocument  *document)
{
    SampleDocument *sample_document = SAMPLE_DOCUMENT (document);
    return example_document_get_n_pages (sample_document->document);
}

static EvPage *
sample_document_get_page (EvDocument *document,
                          gint        index)
{
    SampleDocument *sample_document = SAMPLE_DOCUMENT (document);
    ExamplePage    *example_page;
    EvPage         *page;

    example_page = example_document_get_page (sample_document->document, index);
    page = ev_page_new (index);

    page->backend_page = (EvBackendPage)g_object_ref (example_page);
    page->backend_destroy_func = (EvBackendPageDestroyFunc)g_object_unref;
    g_object_unref (example_page);

    return page;
}

static void
sample_document_get_page_size (EvDocument *document,
                               EvPage     *page,
                               double     *width,
                               double     *height)
{
    g_return_if_fail (EXAMPLE_IS_PAGE (page->backend_page));
    example_page_get_size (EXAMPLE_PAGE (page->backend_page), width, height);
}

static cairo_surface_t *
sample_document_render (EvDocument      *document,
                        EvRenderContext *rc)
{
    ExamplePage     *example_page;
    gdouble          width_points, height_points;
    guint            width,        height;
    cairo_surface_t *surface;
    cairo_t         *cr;

    example_page = EXAMPLE_PAGE (rc->page->backend_page);

    example_page_get_size (example_page, &width_points, &height_points);

    if (rc->rotation == 90 || rc->rotation == 270) {
        width  = (guint) ((height_points * rc->scale) + 0.5);
        height = (guint) ((width_points  * rc->scale) + 0.5);
    } else {
        width  = (guint) ((width_points  * rc->scale) + 0.5);
        height = (guint) ((height_points * rc->scale) + 0.5);
    }

    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
                                          width, height);
    cr = cairo_create (surface);

    switch (rc->rotation) {
    case 90:
        cairo_translate (cr, width, 0);
        break;
    case 180:
        cairo_translate (cr, width, height);
        break;
    case 270:
        cairo_translate (cr, 0, height);
        break;
    default:
        cairo_translate (cr, 0, 0);
    }

    cairo_scale  (cr, rc->scale, rc->scale);
    cairo_rotate (cr, rc->rotation * G_PI / 180.0);
    example_page_render (example_page, cr);

    cairo_set_operator   (cr, CAIRO_OPERATOR_DEST_OVER);
    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
    cairo_paint          (cr);

    cairo_destroy (cr);

    return surface;
}

static void
sample_document_class_init (SampleDocumentClass *klass)
{
    GObjectClass    *gobject_class     = G_OBJECT_CLASS (klass);
    EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
    gobject_class->dispose = sample_document_dispose;

    ev_document_class->load          = sample_document_load;
    ev_document_class->get_n_pages   = sample_document_get_n_pages;
    ev_document_class->get_page      = sample_document_get_page;
    ev_document_class->get_page_size = sample_document_get_page_size;
    ev_document_class->render        = sample_document_render;
}