+/*
+ * Copyright (C) 20019 - The Geeqie Team
+ *
+ * Author: Colin Clark
+ *
+ * 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 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "main.h"
+
+#include "image-load.h"
+#include "image_load_djvu.h"
+
+#ifdef HAVE_DJVU
+
+#include <libdjvu/ddjvuapi.h>
+#include <libdjvu/miniexp.h>
+
+typedef struct _ImageLoaderDJVU ImageLoaderDJVU;
+struct _ImageLoaderDJVU {
+ ImageLoaderBackendCbAreaUpdated area_updated_cb;
+ ImageLoaderBackendCbSize size_cb;
+ ImageLoaderBackendCbAreaPrepared area_prepared_cb;
+ gpointer data;
+ GdkPixbuf *pixbuf;
+ guint requested_width;
+ guint requested_height;
+ gboolean abort;
+ gint page_num;
+ gint page_total;
+};
+
+static void free_buffer(guchar *pixels, gpointer data)
+{
+ g_free (pixels);;
+}
+
+static gboolean image_loader_djvu_load(gpointer loader, const guchar *buf, gsize count, GError **error)
+{
+ ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
+ ddjvu_context_t *ctx;
+ ddjvu_document_t *doc;
+ ddjvu_page_t *page;
+ ddjvu_rect_t rrect;
+ ddjvu_rect_t prect;
+ ddjvu_format_t *fmt;
+ gint width, height;
+ gint stride;
+ gboolean alpha = FALSE;
+ cairo_surface_t *surface;
+ gchar *pixels;
+
+ ctx = ddjvu_context_create(NULL);
+
+ doc = ddjvu_document_create(ctx, NULL, FALSE);
+
+ ddjvu_stream_write(doc, 0, buf, count );
+ while (!ddjvu_document_decoding_done(doc));
+
+ ld->page_total = ddjvu_document_get_pagenum(doc);
+
+ page = ddjvu_page_create_by_pageno(doc, ld->page_num);
+ while (!ddjvu_page_decoding_done(page));
+
+ fmt = ddjvu_format_create(DDJVU_FORMAT_RGB24, 0, 0);
+
+ width = ddjvu_page_get_width(page);
+ height = ddjvu_page_get_height(page);
+ stride = width * 4;
+
+ pixels = (gchar *)g_malloc(height * stride);
+
+ prect.x = 0;
+ prect.y = 0;
+ prect.w = width;
+ prect.h = height;
+ rrect = prect;
+
+ surface = cairo_image_surface_create_for_data((guchar *)pixels, CAIRO_FORMAT_RGB24, width, height, stride);
+
+ ddjvu_page_render(page, DDJVU_RENDER_COLOR, &prect, &rrect, fmt, stride, pixels);
+
+ ld->pixbuf = gdk_pixbuf_new_from_data(pixels, GDK_COLORSPACE_RGB, alpha, 8, width, height, stride, free_buffer, NULL);
+
+ ld->area_updated_cb(loader, 0, 0, width, height, ld->data);
+
+ cairo_surface_destroy(surface);
+ ddjvu_page_release(page);
+ ddjvu_document_release(doc);
+ ddjvu_context_release(ctx);
+
+ return TRUE;
+}
+
+static gpointer image_loader_djvu_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
+{
+ ImageLoaderDJVU *loader = g_new0(ImageLoaderDJVU, 1);
+ loader->area_updated_cb = area_updated_cb;
+ loader->size_cb = size_cb;
+ loader->area_prepared_cb = area_prepared_cb;
+ loader->data = data;
+ return (gpointer) loader;
+}
+
+static void image_loader_djvu_set_size(gpointer loader, int width, int height)
+{
+ ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
+ ld->requested_width = width;
+ ld->requested_height = height;
+}
+
+static GdkPixbuf* image_loader_djvu_get_pixbuf(gpointer loader)
+{
+ ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
+ return ld->pixbuf;
+}
+
+static gchar* image_loader_djvu_get_format_name(gpointer loader)
+{
+ return g_strdup("djvu");
+}
+
+static gchar** image_loader_djvu_get_format_mime_types(gpointer loader)
+{
+ static gchar *mime[] = {"image/vnd.djvu", NULL};
+ return g_strdupv(mime);
+}
+
+static void image_loader_djvu_set_page_num(gpointer loader, gint page_num)
+{
+ ImageLoader *il = (ImageLoader *) loader;
+ ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
+
+ ld->page_num = page_num;
+}
+
+static gint image_loader_djvu_get_page_total(gpointer loader)
+{
+ ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
+
+ return ld->page_total;
+}
+
+static gboolean image_loader_djvu_close(gpointer loader, GError **error)
+{
+ return TRUE;
+}
+
+static void image_loader_djvu_abort(gpointer loader)
+{
+ ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
+ ld->abort = TRUE;
+}
+
+static void image_loader_djvu_free(gpointer loader)
+{
+ ImageLoaderDJVU *ld = (ImageLoaderDJVU *) loader;
+ if (ld->pixbuf) g_object_unref(ld->pixbuf);
+ g_free(ld);
+}
+
+void image_loader_backend_set_djvu(ImageLoaderBackend *funcs)
+{
+ funcs->loader_new = image_loader_djvu_new;
+ funcs->set_size = image_loader_djvu_set_size;
+ funcs->load = image_loader_djvu_load;
+ funcs->write = NULL;
+ funcs->get_pixbuf = image_loader_djvu_get_pixbuf;
+ funcs->close = image_loader_djvu_close;
+ funcs->abort = image_loader_djvu_abort;
+ funcs->free = image_loader_djvu_free;
+ funcs->get_format_name = image_loader_djvu_get_format_name;
+ funcs->get_format_mime_types = image_loader_djvu_get_format_mime_types;
+ funcs->set_page_num = image_loader_djvu_set_page_num;
+ funcs->get_page_total = image_loader_djvu_get_page_total;
+}
+
+#endif
+/* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */