2 * Copyright (C) 20019 - The Geeqie Team
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.
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.
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.
23 #include "image-load.h"
24 #include "image-load-djvu.h"
28 #include <libdjvu/ddjvuapi.h>
29 #include <libdjvu/miniexp.h>
31 struct ImageLoaderDJVU {
32 ImageLoaderBackendCbAreaUpdated area_updated_cb;
33 ImageLoaderBackendCbSize size_cb;
34 ImageLoaderBackendCbAreaPrepared area_prepared_cb;
37 guint requested_width;
38 guint requested_height;
44 static void free_buffer(guchar *pixels, gpointer)
49 static gboolean image_loader_djvu_load(gpointer loader, const guchar *buf, gsize count, GError **)
51 auto ld = static_cast<ImageLoaderDJVU *>(loader);
53 ddjvu_document_t *doc;
60 gboolean alpha = FALSE;
61 cairo_surface_t *surface;
64 ctx = ddjvu_context_create(nullptr);
66 doc = ddjvu_document_create(ctx, nullptr, FALSE);
68 ddjvu_stream_write(doc, 0, reinterpret_cast<const char *>(buf), count );
69 while (!ddjvu_document_decoding_done(doc));
71 ld->page_total = ddjvu_document_get_pagenum(doc);
73 page = ddjvu_page_create_by_pageno(doc, ld->page_num);
74 while (!ddjvu_page_decoding_done(page));
76 fmt = ddjvu_format_create(DDJVU_FORMAT_RGB24, 0, nullptr);
78 width = ddjvu_page_get_width(page);
79 height = ddjvu_page_get_height(page);
82 pixels = static_cast<guchar *>(g_malloc(height * stride));
90 surface = cairo_image_surface_create_for_data(pixels, CAIRO_FORMAT_RGB24, width, height, stride);
92 ddjvu_page_render(page, DDJVU_RENDER_COLOR, &prect, &rrect, fmt, stride, reinterpret_cast<char *>(pixels));
95 * @FIXME implementation of rotation is not correct */
98 tmp1 = gdk_pixbuf_new_from_data(pixels, GDK_COLORSPACE_RGB, alpha, 8, width, height, stride, free_buffer, nullptr);
99 tmp2 = gdk_pixbuf_flip(tmp1, TRUE);
100 g_object_unref(tmp1);
102 ld->pixbuf = gdk_pixbuf_rotate_simple(tmp2,GDK_PIXBUF_ROTATE_UPSIDEDOWN);
104 ld->area_updated_cb(loader, 0, 0, width, height, ld->data);
107 cairo_surface_destroy(surface);
108 ddjvu_page_release(page);
109 ddjvu_document_release(doc);
110 ddjvu_context_release(ctx);
115 static gpointer image_loader_djvu_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
117 auto loader = g_new0(ImageLoaderDJVU, 1);
118 loader->area_updated_cb = area_updated_cb;
119 loader->size_cb = size_cb;
120 loader->area_prepared_cb = area_prepared_cb;
125 static void image_loader_djvu_set_size(gpointer loader, int width, int height)
127 auto ld = static_cast<ImageLoaderDJVU *>(loader);
128 ld->requested_width = width;
129 ld->requested_height = height;
132 static GdkPixbuf* image_loader_djvu_get_pixbuf(gpointer loader)
134 auto ld = static_cast<ImageLoaderDJVU *>(loader);
138 static gchar* image_loader_djvu_get_format_name(gpointer)
140 return g_strdup("djvu");
143 static gchar** image_loader_djvu_get_format_mime_types(gpointer)
145 static const gchar *mime[] = {"image/vnd.djvu", nullptr};
146 return g_strdupv(const_cast<gchar **>(mime));
149 static void image_loader_djvu_set_page_num(gpointer loader, gint page_num)
151 auto ld = static_cast<ImageLoaderDJVU *>(loader);
153 ld->page_num = page_num;
156 static gint image_loader_djvu_get_page_total(gpointer loader)
158 auto ld = static_cast<ImageLoaderDJVU *>(loader);
160 return ld->page_total;
163 static gboolean image_loader_djvu_close(gpointer, GError **)
168 static void image_loader_djvu_abort(gpointer loader)
170 auto ld = static_cast<ImageLoaderDJVU *>(loader);
174 static void image_loader_djvu_free(gpointer loader)
176 auto ld = static_cast<ImageLoaderDJVU *>(loader);
177 if (ld->pixbuf) g_object_unref(ld->pixbuf);
181 void image_loader_backend_set_djvu(ImageLoaderBackend *funcs)
183 funcs->loader_new = image_loader_djvu_new;
184 funcs->set_size = image_loader_djvu_set_size;
185 funcs->load = image_loader_djvu_load;
186 funcs->write = nullptr;
187 funcs->get_pixbuf = image_loader_djvu_get_pixbuf;
188 funcs->close = image_loader_djvu_close;
189 funcs->abort = image_loader_djvu_abort;
190 funcs->free = image_loader_djvu_free;
191 funcs->get_format_name = image_loader_djvu_get_format_name;
192 funcs->get_format_mime_types = image_loader_djvu_get_format_mime_types;
193 funcs->set_page_num = image_loader_djvu_set_page_num;
194 funcs->get_page_total = image_loader_djvu_get_page_total;
198 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */