src/image_load_djvu.c

   1 /*
   2  * Copyright (C) 20019 - The Geeqie Team
   3  *
   4  * Author: Colin Clark
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include "main.h"
  22
  23 #include "image-load.h"
  24 #include "image_load_djvu.h"
  25
  26 #ifdef HAVE_DJVU
  27
  28 #include <libdjvu/ddjvuapi.h>
  29 #include <libdjvu/miniexp.h>
  30
  31 typedef struct _ImageLoaderDJVU ImageLoaderDJVU;
  32 struct _ImageLoaderDJVU {
  33         ImageLoaderBackendCbAreaUpdated area_updated_cb;
  34         ImageLoaderBackendCbSize size_cb;
  35         ImageLoaderBackendCbAreaPrepared area_prepared_cb;
  36         gpointer data;
  37         GdkPixbuf *pixbuf;
  38         guint requested_width;
  39         guint requested_height;
  40         gboolean abort;
  41         gint page_num;
  42         gint page_total;
  43 };
  44
  45 static void free_buffer(guchar *pixels, gpointer data)
  46 {
  47         g_free (pixels);;
  48 }
  49
  50 static gboolean image_loader_djvu_load(gpointer loader, const guchar *buf, gsize count, GError **error)
  51 {
  52         ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
  53         ddjvu_context_t *ctx;
  54         ddjvu_document_t *doc;
  55         ddjvu_page_t *page;
  56         ddjvu_rect_t rrect;
  57         ddjvu_rect_t prect;
  58         ddjvu_format_t *fmt;
  59         gint width, height;
  60         gint stride;
  61         gboolean alpha = FALSE;
  62         cairo_surface_t *surface;
  63         gchar *pixels;
  64
  65         ctx = ddjvu_context_create(NULL);
  66
  67         doc = ddjvu_document_create(ctx, NULL, FALSE);
  68
  69         ddjvu_stream_write(doc, 0, buf, count );
  70         while (!ddjvu_document_decoding_done(doc));
  71
  72         ld->page_total = ddjvu_document_get_pagenum(doc);
  73
  74         page = ddjvu_page_create_by_pageno(doc, ld->page_num);
  75         while (!ddjvu_page_decoding_done(page));
  76
  77         fmt = ddjvu_format_create(DDJVU_FORMAT_RGB24, 0, 0);
  78
  79         width = ddjvu_page_get_width(page);
  80         height = ddjvu_page_get_height(page);
  81         stride = width * 4;
  82
  83         pixels = (gchar *)g_malloc(height * stride);
  84
  85         prect.x = 0;
  86         prect.y = 0;
  87         prect.w = width;
  88         prect.h = height;
  89         rrect = prect;
  90
  91         surface = cairo_image_surface_create_for_data((guchar *)pixels, CAIRO_FORMAT_RGB24, width, height, stride);
  92
  93         ddjvu_page_render(page, DDJVU_RENDER_COLOR, &prect, &rrect, fmt, stride, pixels);
  94
  95         ld->pixbuf = gdk_pixbuf_new_from_data(pixels, GDK_COLORSPACE_RGB, alpha, 8, width, height, stride, free_buffer, NULL);
  96
  97         ld->area_updated_cb(loader, 0, 0, width, height, ld->data);
  98
  99         cairo_surface_destroy(surface);
 100         ddjvu_page_release(page);
 101         ddjvu_document_release(doc);
 102         ddjvu_context_release(ctx);
 103
 104         return TRUE;
 105 }
 106
 107 static gpointer image_loader_djvu_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
 108 {
 109         ImageLoaderDJVU *loader = g_new0(ImageLoaderDJVU, 1);
 110         loader->area_updated_cb = area_updated_cb;
 111         loader->size_cb = size_cb;
 112         loader->area_prepared_cb = area_prepared_cb;
 113         loader->data = data;
 114         return (gpointer) loader;
 115 }
 116
 117 static void image_loader_djvu_set_size(gpointer loader, int width, int height)
 118 {
 119         ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
 120         ld->requested_width = width;
 121         ld->requested_height = height;
 122 }
 123
 124 static GdkPixbuf* image_loader_djvu_get_pixbuf(gpointer loader)
 125 {
 126         ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
 127         return ld->pixbuf;
 128 }
 129
 130 static gchar* image_loader_djvu_get_format_name(gpointer loader)
 131 {
 132         return g_strdup("djvu");
 133 }
 134
 135 static gchar** image_loader_djvu_get_format_mime_types(gpointer loader)
 136 {
 137         static gchar *mime[] = {"image/vnd.djvu", NULL};
 138         return g_strdupv(mime);
 139 }
 140
 141 static void image_loader_djvu_set_page_num(gpointer loader, gint page_num)
 142 {
 143         ImageLoader *il = (ImageLoader *) loader;
 144         ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
 145
 146         ld->page_num = page_num;
 147 }
 148
 149 static gint image_loader_djvu_get_page_total(gpointer loader)
 150 {
 151         ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
 152
 153         return ld->page_total;
 154 }
 155
 156 static gboolean image_loader_djvu_close(gpointer loader, GError **error)
 157 {
 158         return TRUE;
 159 }
 160
 161 static void image_loader_djvu_abort(gpointer loader)
 162 {
 163         ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
 164         ld->abort = TRUE;
 165 }
 166
 167 static void image_loader_djvu_free(gpointer loader)
 168 {
 169         ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
 170         if (ld->pixbuf) g_object_unref(ld->pixbuf);
 171         g_free(ld);
 172 }
 173
 174 void image_loader_backend_set_djvu(ImageLoaderBackend *funcs)
 175 {
 176         funcs->loader_new = image_loader_djvu_new;
 177         funcs->set_size = image_loader_djvu_set_size;
 178         funcs->load = image_loader_djvu_load;
 179         funcs->write = NULL;
 180         funcs->get_pixbuf = image_loader_djvu_get_pixbuf;
 181         funcs->close = image_loader_djvu_close;
 182         funcs->abort = image_loader_djvu_abort;
 183         funcs->free = image_loader_djvu_free;
 184         funcs->get_format_name = image_loader_djvu_get_format_name;
 185         funcs->get_format_mime_types = image_loader_djvu_get_format_mime_types;
 186         funcs->set_page_num = image_loader_djvu_set_page_num;
 187         funcs->get_page_total = image_loader_djvu_get_page_total;
 188 }
 189
 190 #endif
 191 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */