Merge commit 'upstream/2.31.5.bzr424'

10 files changed, 933 insertions, 1110 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index e6654d0..8a4f587 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -29,6 +29,7 @@ simple_scan_CFLAGS = \
 simple_scan_LDADD = \
 	$(SIMPLE_SCAN_LIBS) \
 	-lsane \
+	-ljpeg \
 	-lm
 
 DISTCLEANFILES = \
diff --git a/src/Makefile.in b/src/Makefile.in
deleted file mode 100644
index 5665293..0000000
--- a/src/Makefile.in
+++ /dev/null
@@ -1,661 +0,0 @@
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-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
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-	-lm
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diff --git a/src/book.c b/src/book.c
index 1c1cc6e..387c7f0 100644
--- a/src/book.c
+++ b/src/book.c
@@ -9,16 +9,22 @@
  * license.
  */
 
+#include <stdio.h>
 #include <string.h>
 #include <math.h>
+#include <zlib.h>
+#include <jpeglib.h>
 #include <gdk/gdk.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <cairo/cairo-pdf.h>
 #include <cairo/cairo-ps.h>
-#include <unistd.h> // TEMP: Needed for close() in get_temporary_filename()
 
 #include "book.h"
 
+enum {
+    PROP_0,
+    PROP_NEEDS_SAVING
+};
 
 enum {
     PAGE_ADDED,
@@ -31,6 +37,8 @@ static guint signals[LAST_SIGNAL] = { 0, };
 struct BookPrivate
 {
     GList *pages;
+  
+    gboolean needs_saving;
 };
 
 G_DEFINE_TYPE (Book, book, G_TYPE_OBJECT);
@@ -57,17 +65,28 @@ book_clear (Book *book)
 }
 
 
+static void
+page_changed_cb (Page *page, Book *book)
+{
+    book_set_needs_saving (book, TRUE);
+}
+
+
 Page *
 book_append_page (Book *book, gint width, gint height, gint dpi, Orientation orientation)
 {
     Page *page;
 
     page = page_new ();
+    g_signal_connect (page, "image-changed", G_CALLBACK (page_changed_cb), book);
+    g_signal_connect (page, "crop-changed", G_CALLBACK (page_changed_cb), book);
     page_setup (page, width, height, dpi, orientation);
 
     book->priv->pages = g_list_append (book->priv->pages, page);
 
     g_signal_emit (book, signals[PAGE_ADDED], 0, page);
+  
+    book_set_needs_saving (book, TRUE);
 
     return page;
 }
@@ -76,10 +95,14 @@ book_append_page (Book *book, gint width, gint height, gint dpi, Orientation ori
 void
 book_delete_page (Book *book, Page *page)
 {
+    g_signal_handlers_disconnect_by_func (page, page_changed_cb, book);
+
     g_signal_emit (book, signals[PAGE_REMOVED], 0, page);
 
     book->priv->pages = g_list_remove (book->priv->pages, page);
     g_object_unref (page);
+
+    book_set_needs_saving (book, TRUE);
 }
 
 
@@ -218,160 +241,148 @@ book_save_ps (Book *book, GFile *file, GError **error)
 }
 
 
-// TEMP: Copied from simple-scan.c
-static GFile *
-get_temporary_file (const gchar *prefix, const gchar *extension)
+typedef struct
 {
-    gint fd;
-    GFile *file;
-    gchar *filename, *path;
-    GError *error = NULL;
+    int offset;
+    int n_objects;
+    GList *object_offsets;
+    GFileOutputStream *stream;
+} PDFWriter;
 
-    /* NOTE: I'm not sure if this is a 100% safe strategy to use g_file_open_tmp(), close and
-     * use the filename but it appears to work in practise */
 
-    filename = g_strdup_printf ("%s-XXXXXX.%s", prefix, extension);
-    fd = g_file_open_tmp (filename, &path, &error);
-    g_free (filename);
-    if (fd < 0) {
-        g_warning ("Error saving email attachment: %s", error->message);
-        g_clear_error (&error);
-        return NULL;
-    }
-    close (fd);
-  
-    file = g_file_new_for_path (path);
-    g_free (path);
+static PDFWriter *
+pdf_writer_new (GFileOutputStream *stream)
+{
+    PDFWriter *writer;
+    writer = g_malloc0 (sizeof (PDFWriter));
+    writer->stream = g_object_ref (stream);
+    return writer;
+}
 
-    return file;
+
+static void
+pdf_writer_free (PDFWriter *writer)
+{
+    g_object_unref (writer->stream);
+    g_list_free (writer->object_offsets);
+    g_free (writer);
 }
 
 
-static goffset
-get_file_size (GFile *file)
+static void
+pdf_write (PDFWriter *writer, const unsigned char *data, size_t length)
 {
-    GFileInfo *info;
-    goffset size = 0;
-  
-    info = g_file_query_info (file,
-                              G_FILE_ATTRIBUTE_STANDARD_SIZE,
-                              G_FILE_QUERY_INFO_NONE,
-                              NULL,
-                              NULL);
-    if (info) {
-        size = g_file_info_get_size (info);
-        g_object_unref (info);
-    }
+    g_output_stream_write_all (G_OUTPUT_STREAM (writer->stream), data, length, NULL, NULL, NULL);
+    writer->offset += length;
+}
+
 
-    return size;
+static void
+pdf_printf (PDFWriter *writer, const char *format, ...)
+{
+    va_list args;
+    gchar *string;
+
+    va_start (args, format);
+    string = g_strdup_vprintf (format, args);
+    va_end (args);
+    pdf_write (writer, (unsigned char *)string, strlen (string));
+
+    g_free (string);
 }
 
 
-static gboolean
-book_save_pdf_with_imagemagick (Book *book, GFile *file, GError **error)
+static int
+pdf_start_object (PDFWriter *writer)
 {
-    GList *iter;
-    GString *command_line;
-    gboolean result = TRUE;
-    gint exit_status = 0;
-    GFile *output_file = NULL;
-    GList *link, *temporary_files = NULL;
+    writer->n_objects++;
+    writer->object_offsets = g_list_append (writer->object_offsets, GINT_TO_POINTER (writer->offset));
+    return writer->n_objects;
+}
 
-    /* ImageMagick command to create a PDF */
-    command_line = g_string_new ("convert -adjoin");
 
-    /* Save each page to a file */
-    for (iter = book->priv->pages; iter && result; iter = iter->next) {
-        Page *page = iter->data;
-        GFile *jpeg_file, *tiff_file;
-        gchar *path, *resolution_command, *stdout_text = NULL, *stderr_text = NULL;
-        gint jpeg_size, tiff_size;
-
-        jpeg_file = get_temporary_file ("simple-scan", "jpg");
-        result = page_save (page, "jpeg", jpeg_file, error);
-        jpeg_size = get_file_size (jpeg_file);
-        temporary_files = g_list_append (temporary_files, jpeg_file);
-
-        tiff_file = get_temporary_file ("simple-scan", "tiff");
-        result = page_save (page, "tiff", tiff_file, error);
-        tiff_size = get_file_size (tiff_file);
-        temporary_files = g_list_append (temporary_files, tiff_file);
-
-        /* Use the smallest file */
-        if (jpeg_size < tiff_size)
-            path = g_file_get_path (jpeg_file);
-        else
-            path = g_file_get_path (tiff_file);
-
-        resolution_command = g_strdup_printf ("convert %s -density %d %s", path, page_get_dpi (page), path);
-        g_debug ("Executing ImageMagick command: %s", resolution_command);
-        result = g_spawn_command_line_sync (resolution_command, &stdout_text, &stderr_text, &exit_status, error);
-        if (result && exit_status != 0) {
-            g_warning ("ImageMagick returned error code %d, command line was: %s", exit_status, resolution_command);
-            g_warning ("stdout: %s", stdout_text);
-            g_warning ("stderr: %s", stderr_text);
-            result = FALSE;
-            g_set_error (error, BOOK_TYPE, 0,
-                         "ImageMagick returned error code %d\n"
-                         "\n"
-                         "Command line: %s\n"
-                         "Stdout: %s\n"
-                         "Stderr: %s",
-                         exit_status, resolution_command, stdout_text, stderr_text);
-        }
-        if (!result)
+static guchar *
+compress_zlib (guchar *data, size_t length, size_t *n_written)
+{
+    z_stream stream;
+    guchar *out_data;
+
+    out_data = g_malloc (sizeof (guchar) * length);
+
+    stream.zalloc = Z_NULL;
+    stream.zfree = Z_NULL;
+    stream.opaque = Z_NULL;
+    if (deflateInit (&stream, Z_BEST_COMPRESSION) != Z_OK)
+        return NULL;
+
+    stream.next_in = data;
+    stream.avail_in = length;
+    stream.next_out = out_data;
+    stream.avail_out = length;
+    while (stream.avail_in > 0) {
+        if (deflate (&stream, Z_FINISH) == Z_STREAM_ERROR)
             break;
-      
-        g_string_append_printf (command_line, " %s", path);
-        g_free (path);
     }
 
-    /* Use ImageMagick command to create a PDF */  
-    if (result) {
-        gchar *path, *stdout_text = NULL, *stderr_text = NULL;
-
-        output_file = get_temporary_file ("simple-scan", "pdf");
-        path = g_file_get_path (output_file);
-        g_string_append_printf (command_line, " %s", path);
-        g_free (path);
-
-        g_debug ("Executing ImageMagick command: %s", command_line->str);
-        result = g_spawn_command_line_sync (command_line->str, &stdout_text, &stderr_text, &exit_status, error);
-        if (result && exit_status != 0) {
-            g_warning ("ImageMagick returned error code %d, command line was: %s", exit_status, command_line->str);
-            g_warning ("stdout: %s", stdout_text);
-            g_warning ("stderr: %s", stderr_text);
-            result = FALSE;
-            g_set_error (error, BOOK_TYPE, 0,
-                         "ImageMagick returned error code %d\n"
-                         "\n"
-                         "Command line: %s\n"
-                         "Stdout: %s\n"
-                         "Stderr: %s",
-                         exit_status, command_line->str, stdout_text, stderr_text);
-        }
-        g_free (stdout_text);
-        g_free (stderr_text);
+    deflateEnd (&stream);
+
+    if (stream.avail_in > 0) {
+        g_free (out_data);
+        return NULL;
     }
 
-    /* Move to target URI */
-    if (result)
-        result = g_file_move (output_file, file, G_FILE_COPY_OVERWRITE, NULL, NULL, NULL, error);
-  
-    /* Delete page files */
-    for (link = temporary_files; link; link = link->next) {
-        GFile *f = link->data;
+    *n_written = length - stream.avail_out;
+
+    return out_data;
+}
 
-        g_file_delete (f, NULL, NULL);
-        g_object_unref (f);
+
+static void jpeg_init_cb (struct jpeg_compress_struct *info) {}
+static boolean jpeg_empty_cb (struct jpeg_compress_struct *info) { return TRUE; }
+static void jpeg_term_cb (struct jpeg_compress_struct *info) {}
+
+static guchar *
+compress_jpeg (GdkPixbuf *image, size_t *n_written)
+{
+    struct jpeg_compress_struct info;
+    struct jpeg_error_mgr jerr;
+    struct jpeg_destination_mgr dest_mgr;
+    int r;
+    guchar *pixels;
+    guchar *data;
+    size_t max_length;
+
+    info.err = jpeg_std_error (&jerr);
+    jpeg_create_compress (&info);
+
+    pixels = gdk_pixbuf_get_pixels (image);
+    info.image_width = gdk_pixbuf_get_width (image);
+    info.image_height = gdk_pixbuf_get_height (image);
+    info.input_components = 3;
+    info.in_color_space = JCS_RGB; /* TODO: JCS_GRAYSCALE? */
+    jpeg_set_defaults (&info);
+
+    max_length = info.image_width * info.image_height * info.input_components;
+    data = g_malloc (sizeof (guchar) * max_length);
+    dest_mgr.next_output_byte = data;
+    dest_mgr.free_in_buffer = max_length;
+    dest_mgr.init_destination = jpeg_init_cb;
+    dest_mgr.empty_output_buffer = jpeg_empty_cb;
+    dest_mgr.term_destination = jpeg_term_cb;
+    info.dest = &dest_mgr;
+
+    jpeg_start_compress (&info, TRUE);
+    for (r = 0; r < info.image_height; r++) {
+        JSAMPROW row[1];
+        row[0] = pixels + r * gdk_pixbuf_get_rowstride (image);
+        jpeg_write_scanlines (&info, row, 1);
     }
-    g_list_free (temporary_files);
+    jpeg_finish_compress (&info);
+    *n_written = max_length - dest_mgr.free_in_buffer;
 
-    if (output_file)
-        g_object_unref (output_file);
-    g_string_free (command_line, TRUE);
+    jpeg_destroy_compress (&info);
 
-    return result;
+    return data;
 }
 
 
@@ -379,43 +390,249 @@ static gboolean
 book_save_pdf (Book *book, GFile *file, GError **error)
 {
     GFileOutputStream *stream;
-    GList *iter;
-    cairo_surface_t *surface;
-    gchar *imagemagick_executable;
-  
-    /* Use ImageMagick if it is available as then we can compress the images */
-    imagemagick_executable = g_find_program_in_path ("convert");
-    if (imagemagick_executable) {
-        g_free (imagemagick_executable);
-        return book_save_pdf_with_imagemagick (book, file, error);
-    }
+    PDFWriter *writer;
+    int catalog_number, pages_number, info_number;
+    int xref_offset;
+    int i;
 
     stream = g_file_replace (file, NULL, FALSE, G_FILE_CREATE_NONE, NULL, error);
     if (!stream)
         return FALSE;
 
-    surface = cairo_pdf_surface_create_for_stream ((cairo_write_func_t) write_cairo_data,
-                                                   stream, 0, 0);
+    writer = pdf_writer_new (stream);
+    g_object_unref (stream);
 
-    for (iter = book->priv->pages; iter; iter = iter->next) {
-        Page *page = iter->data;
-        double width, height;
+    /* Header */
+    pdf_printf (writer, "%%PDF-1.3\n");
+  
+    /* Catalog */
+    catalog_number = pdf_start_object (writer);
+    pdf_printf (writer, "%d 0 obj\n", catalog_number);
+    pdf_printf (writer, "<<\n");
+    pdf_printf (writer, "/Type /Catalog\n");
+    pdf_printf (writer, "/Pages %d 0 R\n", catalog_number + 1);
+    pdf_printf (writer, ">>\n");
+    pdf_printf (writer, "endobj\n");
+
+    /* Pages */
+    pdf_printf (writer, "\n");
+    pages_number = pdf_start_object (writer);
+    pdf_printf (writer, "%d 0 obj\n", pages_number);
+    pdf_printf (writer, "<<\n");
+    pdf_printf (writer, "/Type /Pages\n");
+    pdf_printf (writer, "/Kids [");
+    for (i = 0; i < book_get_n_pages (book); i++) {
+        pdf_printf (writer, " %d 0 R", pages_number + 1 + (i*3));
+    }
+    pdf_printf (writer, " ]\n");
+    pdf_printf (writer, "/Count %d\n", book_get_n_pages (book));
+    pdf_printf (writer, ">>\n");
+    pdf_printf (writer, "endobj\n");
+
+    for (i = 0; i < book_get_n_pages (book); i++) {
+        int number, width, height, depth;
+        size_t data_length, compressed_length;
+        Page *page;
         GdkPixbuf *image;
-
+        guchar *pixels, *data, *compressed_data;
+        gchar *command;
+        const gchar *color_space, *filter = NULL;
+        float page_width, page_height;
+
+        page = book_get_page (book, i);
+        width = page_get_width (page);
+        height = page_get_height (page);
+        page_width = width * 72. / page_get_dpi (page);
+        page_height = height * 72. / page_get_dpi (page);
         image = page_get_cropped_image (page);
+        pixels = gdk_pixbuf_get_pixels (image);
+
+        if (page_is_color (page)) {
+            int row;
+
+            depth = 8;
+            color_space = "DeviceRGB";
+            data_length = height * width * 3 + 1;
+            data = g_malloc (sizeof (guchar) * data_length);
+            for (row = 0; row < height; row++) {
+                int x;
+                guchar *in_line, *out_line;
+
+                in_line = pixels + row * gdk_pixbuf_get_rowstride (image);
+                out_line = data + row * width * 3;
+                for (x = 0; x < width; x++) {
+                    guchar *in_p = in_line + x*3;
+                    guchar *out_p = out_line + x*3;
+
+                    out_p[0] = in_p[0];
+                    out_p[1] = in_p[1];
+                    out_p[2] = in_p[2];
+                }
+            }
+        }
+        else if (page_get_depth (page) == 1) {
+            int row, offset = 7;
+            guchar *write_ptr;
+
+            depth = 1;
+            color_space = "DeviceGray";
+            data_length = (height * width + 7) / 8;
+            data = g_malloc (sizeof (guchar) * data_length);
+            write_ptr = data;
+            write_ptr[0] = 0;
+            for (row = 0; row < height; row++) {
+                int x;
+                guchar *in_line;
+
+                in_line = pixels + row * gdk_pixbuf_get_rowstride (image);
+                for (x = 0; x < width; x++) {
+                    guchar *in_p = in_line + x*3;
+                    if (in_p[0])
+                        write_ptr[0] |= 1 << offset;
+                    offset--;
+                    if (offset < 0) {
+                        write_ptr++;
+                        write_ptr[0] = 0;
+                        offset = 7;
+                    }
+                }
+            }
+        }
+        else {
+            int row;
+
+            depth = 8;
+            color_space = "DeviceGray";
+            data_length = height * width + 1;
+            data = g_malloc (sizeof (guchar) * data_length);
+            for (row = 0; row < height; row++) {
+                int x;
+                guchar *in_line, *out_line;
+
+                in_line = pixels + row * gdk_pixbuf_get_rowstride (image);
+                out_line = data + row * width;
+                for (x = 0; x < width; x++) {
+                    guchar *in_p = in_line + x*3;
+                    guchar *out_p = out_line + x;
+
+                    out_p[0] = in_p[0];
+                }
+            }
+        }
 
-        width = gdk_pixbuf_get_width (image) * 72.0 / page_get_dpi (page);
-        height = gdk_pixbuf_get_height (image) * 72.0 / page_get_dpi (page);
-        cairo_pdf_surface_set_size (surface, width, height);
-        save_ps_pdf_surface (surface, image, page_get_dpi (page));
-        cairo_surface_show_page (surface);
-        
+        /* Compress data */
+        compressed_data = compress_zlib (data, data_length, &compressed_length);
+        if (compressed_data) {
+            /* Try if JPEG compression is better */
+            if (depth > 1) {
+                guchar *jpeg_data;
+                size_t jpeg_length;
+
+                jpeg_data = compress_jpeg (image, &jpeg_length);
+                if (jpeg_length < compressed_length) {
+                    filter = "DCTDecode";
+                    g_free (data);
+                    g_free (compressed_data);
+                    data = jpeg_data;
+                    data_length = jpeg_length;
+                }
+            }
+
+            if (!filter) {
+                filter = "FlateDecode";
+                g_free (data);
+                data = compressed_data;
+                data_length = compressed_length;
+            }
+        }
+
+        /* Page */
+        pdf_printf (writer, "\n");
+        number = pdf_start_object (writer);
+        pdf_printf (writer, "%d 0 obj\n", number);
+        pdf_printf (writer, "<<\n");
+        pdf_printf (writer, "/Type /Page\n");
+        pdf_printf (writer, "/Parent %d 0 R\n", pages_number);
+        pdf_printf (writer, "/Resources << /XObject << /Im%d %d 0 R >> >>\n", i, number+1);
+        pdf_printf (writer, "/MediaBox [ 0 0 %.2f %.2f ]\n", page_width, page_height);
+        pdf_printf (writer, "/Contents %d 0 R\n", number+2);
+        pdf_printf (writer, ">>\n");
+        pdf_printf (writer, "endobj\n");
+
+        /* Page image */
+        pdf_printf (writer, "\n");
+        number = pdf_start_object (writer);
+        pdf_printf (writer, "%d 0 obj\n", number);
+        pdf_printf (writer, "<<\n");
+        pdf_printf (writer, "/Type /XObject\n");
+        pdf_printf (writer, "/Subtype /Image\n");
+        pdf_printf (writer, "/Width %d\n", width);
+        pdf_printf (writer, "/Height %d\n", height);
+        pdf_printf (writer, "/ColorSpace /%s\n", color_space);
+        pdf_printf (writer, "/BitsPerComponent %d\n", depth);
+        pdf_printf (writer, "/Length %d\n", data_length);
+        if (filter)
+          pdf_printf (writer, "/Filter /%s\n", filter);
+        pdf_printf (writer, ">>\n");
+        pdf_printf (writer, "stream\n");
+        pdf_write (writer, data, data_length);
+        g_free (data);
+        pdf_printf (writer, "\n");
+        pdf_printf (writer, "endstream\n");
+        pdf_printf (writer, "endobj\n");      
+
+        /* Page contents */
+        command = g_strdup_printf ("q\n"
+                                   "%d 0 0 %d 0 0 cm\n"
+                                   "/Im%d Do\n"
+                                   "Q", width, height, i);
+        pdf_printf (writer, "\n");
+        number = pdf_start_object (writer);
+        pdf_printf (writer, "%d 0 obj\n", number);
+        pdf_printf (writer, "<<\n");
+        pdf_printf (writer, "/Length %d\n", strlen (command) + 1);
+        pdf_printf (writer, ">>\n");
+        pdf_printf (writer, "stream\n");
+        pdf_write (writer, (unsigned char *)command, strlen (command));
+        pdf_printf (writer, "\n");
+        pdf_printf (writer, "endstream\n");
+        pdf_printf (writer, "endobj\n");
+        g_free (command);
+                  
         g_object_unref (image);
     }
+  
+    /* Info */
+    pdf_printf (writer, "\n");
+    info_number = pdf_start_object (writer);
+    pdf_printf (writer, "%d 0 obj\n", info_number);
+    pdf_printf (writer, "<<\n");
+    pdf_printf (writer, "/Creator (Simple Scan " VERSION ")\n");
+    pdf_printf (writer, ">>\n");
+    pdf_printf (writer, "endobj\n");
+
+    /* Cross-reference table */
+    xref_offset = writer->offset;
+    pdf_printf (writer, "xref\n");
+    pdf_printf (writer, "1 %d\n", writer->n_objects);
+    GList *link;
+    for (link = writer->object_offsets; link != NULL; link = link->next) {
+        int offset = GPOINTER_TO_INT (link->data);
+        pdf_printf (writer, "%010d 0000 n\n", offset);
+    }
 
-    cairo_surface_destroy (surface);
-
-    g_object_unref (stream);
+    /* Trailer */
+    pdf_printf (writer, "trailer\n");
+    pdf_printf (writer, "<<\n");
+    pdf_printf (writer, "/Size %d\n", writer->n_objects);
+    pdf_printf (writer, "/Info %d 0 R\n", info_number);
+    pdf_printf (writer, "/Root %d 0 R\n", catalog_number);
+    pdf_printf (writer, ">>\n");
+    pdf_printf (writer, "startxref\n");
+    pdf_printf (writer, "%d\n", xref_offset);
+    pdf_printf (writer, "%%%%EOF\n");
+  
+    pdf_writer_free (writer);
 
     return TRUE;
 }
@@ -424,18 +641,79 @@ book_save_pdf (Book *book, GFile *file, GError **error)
 gboolean
 book_save (Book *book, const gchar *type, GFile *file, GError **error)
 {
+    gboolean result = FALSE;
+
     if (strcmp (type, "jpeg") == 0)
-        return book_save_multi_file (book, "jpeg", file, error);
+        result = book_save_multi_file (book, "jpeg", file, error);
     else if (strcmp (type, "png") == 0)
-        return book_save_multi_file (book, "png", file, error);
+        result = book_save_multi_file (book, "png", file, error);
     else if (strcmp (type, "tiff") == 0)
-        return book_save_multi_file (book, "tiff", file, error);    
+        result = book_save_multi_file (book, "tiff", file, error);    
     else if (strcmp (type, "ps") == 0)
-        return book_save_ps (book, file, error);    
+        result = book_save_ps (book, file, error);    
     else if (strcmp (type, "pdf") == 0)
-        return book_save_pdf (book, file, error);
-    else
-        return FALSE;
+        result = book_save_pdf (book, file, error);
+
+    return result;
+}
+
+
+void
+book_set_needs_saving (Book *book, gboolean needs_saving)
+{
+    gboolean needed_saving = book->priv->needs_saving;
+    book->priv->needs_saving = needs_saving;
+    if (needed_saving != needs_saving)
+        g_object_notify (G_OBJECT (book), "needs-saving");
+}
+
+
+gboolean
+book_get_needs_saving (Book *book)
+{
+    return book->priv->needs_saving;
+}
+
+
+static void
+book_set_property (GObject      *object,
+                   guint         prop_id,
+                   const GValue *value,
+                   GParamSpec   *pspec)
+{
+    Book *self;
+
+    self = BOOK (object);
+
+    switch (prop_id) {
+    case PROP_NEEDS_SAVING:
+        book_set_needs_saving (self, g_value_get_boolean (value));
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+        break;
+    }
+}
+
+
+static void
+book_get_property (GObject    *object,
+                   guint       prop_id,
+                   GValue     *value,
+                   GParamSpec *pspec)
+{
+    Book *self;
+
+    self = BOOK (object);
+
+    switch (prop_id) {
+    case PROP_NEEDS_SAVING:
+        g_value_set_boolean (value, book_get_needs_saving (self));
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+        break;
+    }
 }
 
 
@@ -453,8 +731,18 @@ book_class_init (BookClass *klass)
 {
     GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
+    object_class->get_property = book_get_property;
+    object_class->set_property = book_set_property;
     object_class->finalize = book_finalize;
 
+    g_object_class_install_property (object_class,
+                                     PROP_NEEDS_SAVING,
+                                     g_param_spec_boolean ("needs-saving",
+                                                           "needs-saving",
+                                                           "TRUE if this book needs saving",
+                                                           FALSE,
+                                                           G_PARAM_READWRITE));
+
     signals[PAGE_ADDED] =
         g_signal_new ("page-added",
                       G_TYPE_FROM_CLASS (klass),
diff --git a/src/book.h b/src/book.h
index 4e9e05e..f8fc747 100644
--- a/src/book.h
+++ b/src/book.h
@@ -57,4 +57,8 @@ Page *book_get_page (Book *book, gint page_number);
 
 gboolean book_save (Book *book, const gchar *type, GFile *file, GError **error);
 
+void book_set_needs_saving (Book *book, gboolean needs_saving);
+
+gboolean book_get_needs_saving (Book *book);
+
 #endif /* _BOOK_H_ */
diff --git a/src/page.c b/src/page.c
index 5888a46..655b43b 100644
--- a/src/page.c
+++ b/src/page.c
@@ -31,6 +31,9 @@ struct PagePrivate
     /* Number of rows in this page or -1 if currently unknown */
     gint rows;
 
+    /* Bit depth */
+    gint depth;
+
     /* Color profile */
     gchar *color_profile;
 
@@ -43,6 +46,9 @@ struct PagePrivate
     /* TRUE if have some page data */
     gboolean has_data;
 
+    /* TRUE if have color data */
+    gboolean is_color;
+
     /* Expected next scan row */
     gint scan_line;
 
@@ -179,6 +185,21 @@ gboolean page_has_data (Page *page)
 }
 
 
+gboolean page_is_color (Page *page)
+{
+    g_return_val_if_fail (page != NULL, FALSE);
+    return page->priv->is_color;
+}
+
+
+gint
+page_get_depth (Page *page)
+{
+    g_return_val_if_fail (page != NULL, 0);
+    return page->priv->depth;
+}
+
+
 gint page_get_scan_line (Page *page)
 {
     g_return_val_if_fail (page != NULL, -1);
@@ -191,7 +212,7 @@ set_pixel (ScanLine *line, gint n, gint x, guchar *pixel)
 {
     gint sample;
     guchar *data;
-  
+
     data = line->data + line->data_length * n;
 
     switch (line->format) {
@@ -231,6 +252,11 @@ parse_line (Page *page, ScanLine *line, gint n, gboolean *size_changed)
 
     line_number = line->number + n;
 
+    if (line->format != LINE_GRAY)
+        page->priv->is_color = TRUE;
+    if (line->depth > page->priv->depth)
+        page->priv->depth = line->depth;
+
     /* Extend image if necessary */
     while (line_number >= page_get_scan_height (page)) {
         GdkPixbuf *image;
diff --git a/src/page.h b/src/page.h
index b36fe32..25e3018 100644
--- a/src/page.h
+++ b/src/page.h
@@ -82,6 +82,10 @@ gboolean page_is_scanning (Page *page);
 
 gboolean page_has_data (Page *page);
 
+gboolean page_is_color (Page *page);
+
+gint page_get_depth (Page *page);
+
 gint page_get_scan_line (Page *page);
 
 void page_parse_scan_line (Page *page, ScanLine *line);
diff --git a/src/scanner.c b/src/scanner.c
index a8d09f9..8383f9f 100644
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -792,7 +792,7 @@ close_device (Scanner *scanner)
         g_debug ("sane_close ()");
         scanner->priv->handle = NULL;
     }
-  
+
     g_free (scanner->priv->buffer);
     scanner->priv->buffer = NULL;
 
@@ -1320,10 +1320,12 @@ do_read (Scanner *scanner)
                         n_to_read, &n_read);
     g_debug ("sane_read (%d) -> (%s, %d)", n_to_read, get_status_string (status), n_read);
 
-    /* End of variable length frame */
-    if (status == SANE_STATUS_EOF &&
-        scanner->priv->parameters.lines == -1 &&
-        scanner->priv->bytes_remaining == scanner->priv->parameters.bytes_per_line) {
+    /* Completed read */
+    if (status == SANE_STATUS_EOF) {
+        if (scanner->priv->parameters.lines > 0 && scanner->priv->line_count != scanner->priv->parameters.lines)
+            g_warning ("Scan completed with %d lines, expected %d lines", scanner->priv->parameters.lines, scanner->priv->parameters.lines);
+        if (scanner->priv->n_used > 0)
+            g_warning ("Scan complete with %d bytes of unused data", scanner->priv->n_used);
         do_complete_page (scanner);
         return;
     }
@@ -1344,6 +1346,7 @@ do_read (Scanner *scanner)
     /* Feed out lines */
     if (scanner->priv->n_used >= scanner->priv->parameters.bytes_per_line) {
         ScanLine *line;
+        int i, n_remaining;
 
         line = g_malloc(sizeof(ScanLine));
         switch (scanner->priv->parameters.format) {
@@ -1373,27 +1376,18 @@ do_read (Scanner *scanner)
         scanner->priv->buffer = NULL;
         scanner->priv->line_count += line->n_lines;
 
-        /* On last line */
-        if (scanner->priv->parameters.lines > 0 && scanner->priv->line_count >= scanner->priv->parameters.lines) {
-            emit_signal (scanner, GOT_LINE, line);
-            do_complete_page (scanner);
-        }
-        else {
-            int i, n_remaining;
-
-            /* Increase buffer size if did full read */
-            if (full_read)
-                scanner->priv->buffer_size += scanner->priv->parameters.bytes_per_line;
-
-            scanner->priv->buffer = g_malloc(sizeof(SANE_Byte) * scanner->priv->buffer_size);
-            n_remaining = scanner->priv->n_used - (line->n_lines * line->data_length);
-            scanner->priv->n_used = 0;
-            for (i = 0; i < n_remaining; i++) {
-                scanner->priv->buffer[i] = line->data[i + (line->n_lines * line->data_length)];
-                scanner->priv->n_used++;                
-            }
-            emit_signal (scanner, GOT_LINE, line);
+        /* Increase buffer size if did full read */
+        if (full_read)
+            scanner->priv->buffer_size += scanner->priv->parameters.bytes_per_line;
+
+        scanner->priv->buffer = g_malloc(sizeof(SANE_Byte) * scanner->priv->buffer_size);
+        n_remaining = scanner->priv->n_used - (line->n_lines * line->data_length);
+        scanner->priv->n_used = 0;
+        for (i = 0; i < n_remaining; i++) {
+            scanner->priv->buffer[i] = line->data[i + (line->n_lines * line->data_length)];
+            scanner->priv->n_used++;
         }
+        emit_signal (scanner, GOT_LINE, line);
     }
 }
 
diff --git a/src/simple-scan.c b/src/simple-scan.c
index b8c3962..54236ae 100644
--- a/src/simple-scan.c
+++ b/src/simple-scan.c
@@ -26,6 +26,8 @@
 
 static ScanDevice *default_device = NULL;
 
+static gboolean have_devices = FALSE;
+
 static GUdevClient *udev_client;
 
 static SimpleScan *ui;
@@ -62,6 +64,7 @@ update_scan_devices_cb (Scanner *scanner, GList *devices)
             devices_copy = g_list_prepend (devices_copy, default_device);
     }
 
+    have_devices = devices_copy != NULL;
     ui_set_scan_devices (ui, devices_copy);
   
     g_list_free (devices_copy);
@@ -261,7 +264,7 @@ scanner_failed_cb (Scanner *scanner, GError *error)
                        /* Title of error dialog when scan failed */
                        _("Failed to scan"),
                        error->message,
-                       TRUE);
+                       have_devices);
     }
 }
 
@@ -305,54 +308,6 @@ cancel_cb (SimpleScan *ui)
 }
 
 
-static gboolean
-save_book_by_extension (GFile *file, GError **error)
-{
-    gboolean result;
-    gchar *uri, *uri_lower;
-
-    uri = g_file_get_uri (file);
-    uri_lower = g_utf8_strdown (uri, -1);
-    if (g_str_has_suffix (uri_lower, ".pdf"))
-        result = book_save (book, "pdf", file, error);
-    else if (g_str_has_suffix (uri_lower, ".ps"))
-        result = book_save (book, "ps", file, error);
-    else if (g_str_has_suffix (uri_lower, ".png"))
-        result = book_save (book, "png", file, error);
-    else if (g_str_has_suffix (uri_lower, ".tif") || g_str_has_suffix (uri_lower, ".tiff"))
-        result = book_save (book, "tiff", file, error);
-    else
-        result = book_save (book, "jpeg", file, error);
-
-    g_free (uri);
-    g_free (uri_lower);
-
-    return result;
-}
-
-
-static void
-save_cb (SimpleScan *ui, const gchar *uri)
-{
-    GError *error = NULL;
-    GFile *file;
-
-    g_debug ("Saving to '%s'", uri);
-
-    file = g_file_new_for_uri (uri);
-    if (!save_book_by_extension (file, &error)) {
-        g_warning ("Error saving file: %s", error->message);
-        ui_show_error (ui,
-                       /* Title of error dialog when save failed */
-                       _("Failed to save file"),
-                       error->message,
-               FALSE);
-        g_error_free (error);
-    }
-    g_object_unref (file);
-}
-
-
 static gchar *
 get_temporary_filename (const gchar *prefix, const gchar *extension)
 {
@@ -625,7 +580,6 @@ main (int argc, char **argv)
     book = ui_get_book (ui);
     g_signal_connect (ui, "start-scan", G_CALLBACK (scan_cb), NULL);
     g_signal_connect (ui, "stop-scan", G_CALLBACK (cancel_cb), NULL);
-    g_signal_connect (ui, "save", G_CALLBACK (save_cb), NULL);
     g_signal_connect (ui, "email", G_CALLBACK (email_cb), NULL);
     g_signal_connect (ui, "quit", G_CALLBACK (quit_cb), NULL);
 
diff --git a/src/ui.c b/src/ui.c
index d67ee5e..0d23d25 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -28,7 +28,6 @@
 enum {
     START_SCAN,
     STOP_SCAN,
-    SAVE,
     EMAIL,
     QUIT,
     LAST_SIGNAL
@@ -43,7 +42,10 @@ struct SimpleScanPrivate
     GtkBuilder *builder;
 
     GtkWidget *window, *main_vbox;
+    GtkWidget *info_bar, *info_bar_image, *info_bar_label;
+    GtkWidget *info_bar_close_button, *info_bar_change_scanner_button;
     GtkWidget *page_delete_menuitem, *crop_rotate_menuitem;
+    GtkWidget *save_menuitem, *save_as_menuitem, *save_toolbutton;
     GtkWidget *stop_menuitem, *stop_toolbutton;
 
     GtkWidget *text_toolbar_menuitem, *text_menu_menuitem;
@@ -58,14 +60,18 @@ struct SimpleScanPrivate
     GtkTreeModel *device_model, *text_dpi_model, *photo_dpi_model, *page_side_model, *paper_size_model;
     gboolean setting_devices, user_selected_device;
 
+    gboolean have_error;
+    gchar *error_title, *error_text;
+    gboolean error_change_scanner_hint;
+
     Book *book;
+    gchar *book_uri;
+  
     BookView *book_view;
     gboolean updating_page_menu;
     gint default_page_width, default_page_height, default_page_dpi;
     Orientation default_page_orientation;
   
-    gboolean have_device_list;
-
     gchar *document_hint;
 
     gchar *default_file_name;
@@ -110,6 +116,22 @@ find_scan_device (SimpleScan *ui, const char *device, GtkTreeIter *iter)
 }
 
 
+static void
+show_error_dialog (SimpleScan *ui, const char *error_title, const char *error_text)
+{
+    GtkWidget *dialog;
+
+    dialog = gtk_message_dialog_new (GTK_WINDOW (ui->priv->window),
+                                     GTK_DIALOG_MODAL,
+                                     GTK_MESSAGE_WARNING,
+                                     GTK_BUTTONS_NONE,
+                                     "%s", error_title);
+    gtk_dialog_add_button (GTK_DIALOG (dialog), GTK_STOCK_CLOSE, 0);
+    gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog), "%s", error_text);
+    gtk_widget_destroy (dialog);
+}
+
+
 void
 ui_set_default_file_name (SimpleScan *ui, const gchar *default_file_name)
 {
@@ -154,6 +176,47 @@ device_combo_changed_cb (GtkWidget *widget, SimpleScan *ui)
 }
 
 
+static void
+update_info_bar (SimpleScan *ui)
+{
+    GtkMessageType type;
+    const gchar *title, *text, *image_id;
+    gchar *message;
+    gboolean show_close_button = FALSE;
+    gboolean show_change_scanner_button = FALSE;
+  
+    if (ui->priv->have_error)  {
+        type = GTK_MESSAGE_ERROR;
+        image_id = GTK_STOCK_DIALOG_ERROR;
+        title = ui->priv->error_title;
+        text = ui->priv->error_text;
+        show_close_button = TRUE;
+        show_change_scanner_button = ui->priv->error_change_scanner_hint;
+    }
+    else if (gtk_tree_model_iter_n_children (ui->priv->device_model, NULL) == 0) {
+        type = GTK_MESSAGE_WARNING;
+        image_id = GTK_STOCK_DIALOG_WARNING;
+        /* Warning displayed when no scanners are detected */
+        title = _("No scanners detected");
+        /* Hint to user on why there are no scanners detected */
+        text = _("Please check your scanner is connected and powered on");
+    }
+    else {
+        gtk_widget_hide (ui->priv->info_bar);
+        return;
+    }
+
+    gtk_info_bar_set_message_type (GTK_INFO_BAR (ui->priv->info_bar), type);
+    gtk_image_set_from_stock (GTK_IMAGE (ui->priv->info_bar_image), image_id, GTK_ICON_SIZE_DIALOG);
+    message = g_strdup_printf ("<big><b>%s</b></big>\n\n%s", title, text);
+    gtk_label_set_markup (GTK_LABEL (ui->priv->info_bar_label), message);
+    g_free (message);
+    gtk_widget_set_visible (ui->priv->info_bar_close_button, show_close_button);  
+    gtk_widget_set_visible (ui->priv->info_bar_change_scanner_button, show_change_scanner_button);
+    gtk_widget_show (ui->priv->info_bar);
+}
+
+
 void
 ui_set_scan_devices (SimpleScan *ui, GList *devices)
 {
@@ -222,18 +285,7 @@ ui_set_scan_devices (SimpleScan *ui, GList *devices)
 
     ui->priv->setting_devices = FALSE;
 
-    if (!ui->priv->have_device_list) {
-        ui->priv->have_device_list = TRUE;
-
-        if (!devices) {
-            ui_show_error (ui,
-                           /* Warning displayed when no scanners are detected */
-                           _("No scanners detected"),
-                           /* Hint to user on why there are no scanners detected */
-                           _("Please check your scanner is connected and powered on"),
-                           FALSE);
-        }
-    }
+    update_info_bar (ui);
 }
 
 
@@ -279,13 +331,272 @@ add_default_page (SimpleScan *ui)
 }
 
 
+static void
+on_file_type_changed (GtkTreeSelection *selection, GtkWidget *dialog)
+{
+    GtkTreeModel *model;
+    GtkTreeIter iter;
+    gchar *path, *filename, *extension, *new_filename;
+
+    if (!gtk_tree_selection_get_selected (selection, &model, &iter))
+        return;
+
+    gtk_tree_model_get (model, &iter, 1, &extension, -1);
+    path = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
+    filename = g_path_get_basename (path);
+
+    /* Replace extension */
+    if (g_strrstr (filename, "."))
+        new_filename = g_strdup_printf ("%.*s%s", (int)(g_strrstr (filename, ".") - filename), filename, extension);
+    else
+        new_filename = g_strdup_printf ("%s%s", filename, extension);
+    gtk_file_chooser_set_current_name (GTK_FILE_CHOOSER (dialog), new_filename);
+
+    g_free (path);
+    g_free (filename);
+    g_free (new_filename);
+    g_free (extension);
+}
+
+
+static gchar *
+choose_file_location (SimpleScan *ui)
+{
+    GtkWidget *dialog;
+    gint response;
+    GtkFileFilter *filter;
+    GtkWidget *expander, *file_type_view;
+    GtkListStore *file_type_store;
+    GtkTreeIter iter;
+    GtkTreeViewColumn *column;
+    const gchar *extension;
+    gchar *directory, *uri = NULL;
+    gint i;
+
+    struct
+    {
+        gchar *label, *extension;
+    } file_types[] =
+    {
+        /* Save dialog: Label for saving in PDF format */
+        { _("PDF (multi-page document)"), ".pdf" },
+        /* Save dialog: Label for saving in JPEG format */
+        { _("JPEG (compressed)"), ".jpg" },
+        /* Save dialog: Label for saving in PNG format */
+        { _("PNG (lossless)"), ".png" },
+        { NULL, NULL }
+    };
+
+    /* Get directory to save to */
+    directory = gconf_client_get_string (ui->priv->client, GCONF_DIR "/save_directory", NULL);
+    if (!directory || directory[0] == '\0') {
+        g_free (directory);
+        directory = g_strdup (g_get_user_special_dir (G_USER_DIRECTORY_DOCUMENTS));
+    }
+
+    dialog = gtk_file_chooser_dialog_new (/* Save dialog: Dialog title */
+                                          _("Save As..."),
+                                          GTK_WINDOW (ui->priv->window),
+                                          GTK_FILE_CHOOSER_ACTION_SAVE,
+                                          GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+                                          GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
+                                          NULL);
+    gtk_file_chooser_set_do_overwrite_confirmation (GTK_FILE_CHOOSER (dialog), TRUE);
+    gtk_file_chooser_set_local_only (GTK_FILE_CHOOSER (dialog), FALSE);
+    gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (dialog), directory);
+    gtk_file_chooser_set_current_name (GTK_FILE_CHOOSER (dialog), ui->priv->default_file_name);
+    g_free (directory);
+
+    /* Filter to only show images by default */
+    filter = gtk_file_filter_new ();
+    gtk_file_filter_set_name (filter,
+                              /* Save dialog: Filter name to show only image files */
+                              _("Image Files"));
+    gtk_file_filter_add_pixbuf_formats (filter);
+    gtk_file_filter_add_mime_type (filter, "application/pdf");
+    gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (dialog), filter);
+    filter = gtk_file_filter_new ();
+    gtk_file_filter_set_name (filter,
+                              /* Save dialog: Filter name to show all files */
+                              _("All Files"));
+    gtk_file_filter_add_pattern (filter, "*");
+    gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (dialog), filter);
+
+    expander = gtk_expander_new_with_mnemonic (/* */
+                                 _("Select File _Type"));
+    gtk_expander_set_spacing (GTK_EXPANDER (expander), 5);
+    gtk_file_chooser_set_extra_widget (GTK_FILE_CHOOSER (dialog), expander);
+  
+    extension = strstr (ui->priv->default_file_name, ".");
+    if (!extension)
+        extension = "";
+
+    file_type_store = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_STRING);
+    for (i = 0; file_types[i].label; i++) {
+        gtk_list_store_append (file_type_store, &iter);
+        gtk_list_store_set (file_type_store, &iter, 0, file_types[i].label, 1, file_types[i].extension, -1);
+    }
+
+    file_type_view = gtk_tree_view_new_with_model (GTK_TREE_MODEL (file_type_store));
+    gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (file_type_view), FALSE);
+    gtk_tree_view_set_rules_hint (GTK_TREE_VIEW (file_type_view), TRUE);
+    column = gtk_tree_view_column_new_with_attributes ("",
+                                                       gtk_cell_renderer_text_new (),
+                                                       "text", 0, NULL);
+    gtk_tree_view_append_column (GTK_TREE_VIEW (file_type_view), column);
+    gtk_container_add (GTK_CONTAINER (expander), file_type_view);
+
+    if (gtk_tree_model_get_iter_first (GTK_TREE_MODEL (file_type_store), &iter)) {
+        do {
+            gchar *e;
+            gtk_tree_model_get (GTK_TREE_MODEL (file_type_store), &iter, 1, &e, -1);
+            if (strcmp (extension, e) == 0)
+                gtk_tree_selection_select_iter (gtk_tree_view_get_selection (GTK_TREE_VIEW (file_type_view)), &iter);
+            g_free (e);
+        } while (gtk_tree_model_iter_next (GTK_TREE_MODEL (file_type_store), &iter));
+    }
+    g_signal_connect (gtk_tree_view_get_selection (GTK_TREE_VIEW (file_type_view)),
+                      "changed",
+                      G_CALLBACK (on_file_type_changed),
+                      dialog);
+
+    gtk_widget_show_all (expander);
+
+    response = gtk_dialog_run (GTK_DIALOG (dialog));
+
+    if (response == GTK_RESPONSE_ACCEPT)
+        uri = gtk_file_chooser_get_uri (GTK_FILE_CHOOSER (dialog));
+
+    gconf_client_set_string (ui->priv->client, GCONF_DIR "/save_directory",
+                             gtk_file_chooser_get_current_folder (GTK_FILE_CHOOSER (dialog)),
+                             NULL);
+
+    gtk_widget_destroy (dialog);
+
+    return uri;
+}
+
+
+static gboolean
+save_document (SimpleScan *ui, gboolean force_choose_location)
+{
+    gboolean result;
+    gchar *uri, *uri_lower;
+    GError *error = NULL;
+    GFile *file;
+  
+    if (ui->priv->book_uri && !force_choose_location)
+        uri = g_strdup (ui->priv->book_uri);
+    else
+        uri = choose_file_location (ui);
+    if (!uri)
+        return FALSE;
+
+    file = g_file_new_for_uri (uri);
+
+    g_debug ("Saving to '%s'", uri);
+
+    uri_lower = g_utf8_strdown (uri, -1);
+    if (g_str_has_suffix (uri_lower, ".pdf"))
+        result = book_save (ui->priv->book, "pdf", file, &error);
+    else if (g_str_has_suffix (uri_lower, ".ps"))
+        result = book_save (ui->priv->book, "ps", file, &error);
+    else if (g_str_has_suffix (uri_lower, ".png"))
+        result = book_save (ui->priv->book, "png", file, &error);
+    else if (g_str_has_suffix (uri_lower, ".tif") || g_str_has_suffix (uri_lower, ".tiff"))
+        result = book_save (ui->priv->book, "tiff", file, &error);
+    else
+        result = book_save (ui->priv->book, "jpeg", file, &error);
+
+    g_free (uri_lower);
+
+    if (result) {
+        g_free (ui->priv->book_uri);
+        ui->priv->book_uri = uri;
+        book_set_needs_saving (ui->priv->book, FALSE);
+    }
+    else {
+        g_free (uri);
+
+        g_warning ("Error saving file: %s", error->message);
+        ui_show_error (ui,
+                       /* Title of error dialog when save failed */
+                       _("Failed to save file"),
+                       error->message,
+                       FALSE);
+        g_clear_error (&error);
+    }
+
+    g_object_unref (file);
+
+    return result;
+}
+
+
+static gboolean
+prompt_to_save (SimpleScan *ui, const gchar *title, const gchar *discard_label)
+{
+    GtkWidget *dialog;
+    gint response;
+
+    if (!book_get_needs_saving (ui->priv->book))
+        return TRUE;
+
+    dialog = gtk_message_dialog_new (GTK_WINDOW (ui->priv->window),
+                                     GTK_DIALOG_MODAL,
+                                     GTK_MESSAGE_WARNING,
+                                     GTK_BUTTONS_NONE,
+                                     "%s", title);
+    gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog), "%s",
+                                              /* Text in dialog warning when a document is about to be lost*/
+                                              _("If you don't save, changes will be permanently lost."));
+    gtk_dialog_add_button (GTK_DIALOG (dialog), discard_label, GTK_RESPONSE_NO);
+    gtk_dialog_add_button (GTK_DIALOG (dialog), GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL);
+    gtk_dialog_add_button (GTK_DIALOG (dialog), GTK_STOCK_SAVE, GTK_RESPONSE_YES);
+
+    response = gtk_dialog_run (GTK_DIALOG (dialog));
+    gtk_widget_destroy (dialog);
+  
+    switch (response) {
+    case GTK_RESPONSE_YES:
+        if (save_document (ui, FALSE))
+            return TRUE;
+        else
+            return FALSE;
+    case GTK_RESPONSE_CANCEL:
+        return FALSE;
+    case GTK_RESPONSE_NO:      
+    default:
+        return TRUE;
+    }
+}
+
+
+static void
+clear_document (SimpleScan *ui)
+{
+    book_clear (ui->priv->book);
+    add_default_page (ui);
+    g_free (ui->priv->book_uri);
+    ui->priv->book_uri = NULL;
+    book_set_needs_saving (ui->priv->book, FALSE);
+    gtk_widget_set_sensitive (ui->priv->save_as_menuitem, FALSE);
+}
+
+
 void new_button_clicked_cb (GtkWidget *widget, SimpleScan *ui);
 G_MODULE_EXPORT
 void
 new_button_clicked_cb (GtkWidget *widget, SimpleScan *ui)
 {
-    book_clear (ui->priv->book);
-    add_default_page (ui);
+    if (!prompt_to_save (ui,
+                         /* Text in dialog warning when a document is about to be lost */
+                         _("Save current document?"),
+                         /* Button in dialog to create new document and discard unsaved document */
+                         _("Discard Changes")))
+        return;
+
+    clear_document (ui);
 }
 
 
@@ -633,11 +944,10 @@ show_page_cb (BookView *view, Page *page, SimpleScan *ui)
     g_object_unref (file);
 
     if (error) {
-        ui_show_error (ui,
-                       /* Error message display when unable to preview image */
-                       _("Unable to open image preview application"),
-                       error->message,
-                       FALSE);
+        show_error_dialog (ui,
+                           /* Error message display when unable to preview image */
+                           _("Unable to open image preview application"),
+                           error->message);
         g_clear_error (&error);
     }
 }
@@ -835,154 +1145,21 @@ page_delete_menuitem_activate_cb (GtkWidget *widget, SimpleScan *ui)
 }
 
 
-static void
-on_file_type_changed (GtkTreeSelection *selection, GtkWidget *dialog)
-{
-    GtkTreeModel *model;
-    GtkTreeIter iter;
-    gchar *path, *filename, *extension, *new_filename;
-
-    if (!gtk_tree_selection_get_selected (selection, &model, &iter))
-        return;
-
-    gtk_tree_model_get (model, &iter, 1, &extension, -1);
-    path = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
-    filename = g_path_get_basename (path);
-
-    /* Replace extension */
-    if (g_strrstr (filename, "."))
-        new_filename = g_strdup_printf ("%.*s%s", (int)(g_strrstr (filename, ".") - filename), filename, extension);
-    else
-        new_filename = g_strdup_printf ("%s%s", filename, extension);
-    gtk_file_chooser_set_current_name (GTK_FILE_CHOOSER (dialog), new_filename);
-
-    g_free (path);
-    g_free (filename);
-    g_free (new_filename);
-    g_free (extension);
-}
-
-
 void save_file_button_clicked_cb (GtkWidget *widget, SimpleScan *ui);
 G_MODULE_EXPORT
 void
 save_file_button_clicked_cb (GtkWidget *widget, SimpleScan *ui)
 {
-    GtkWidget *dialog;
-    gint response;
-    GtkFileFilter *filter;
-    GtkWidget *expander, *file_type_view;
-    GtkListStore *file_type_store;
-    GtkTreeIter iter;
-    GtkTreeViewColumn *column;
-    const gchar *extension;
-    gchar *directory;
-    gint i;
-
-    struct
-    {
-        gchar *label, *extension;
-    } file_types[] =
-    {
-        /* Save dialog: Label for saving in PDF format */
-        { _("PDF (multi-page document)"), ".pdf" },
-        /* Save dialog: Label for saving in JPEG format */
-        { _("JPEG (compressed)"), ".jpg" },
-        /* Save dialog: Label for saving in PNG format */
-        { _("PNG (lossless)"), ".png" },
-        { NULL, NULL }
-    };
-
-    /* Get directory to save to */
-    directory = gconf_client_get_string (ui->priv->client, GCONF_DIR "/save_directory", NULL);
-    if (!directory || directory[0] == '\0') {
-        g_free (directory);
-        directory = g_strdup (g_get_user_special_dir (G_USER_DIRECTORY_DOCUMENTS));
-    }
-
-    dialog = gtk_file_chooser_dialog_new (/* Save dialog: Dialog title */
-                                          _("Save As..."),
-                                          GTK_WINDOW (ui->priv->window),
-                                          GTK_FILE_CHOOSER_ACTION_SAVE,
-                                          GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
-                                          GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
-                                          NULL);
-    gtk_file_chooser_set_do_overwrite_confirmation (GTK_FILE_CHOOSER (dialog), TRUE);
-    gtk_file_chooser_set_local_only (GTK_FILE_CHOOSER (dialog), FALSE);
-    gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (dialog), directory);
-    gtk_file_chooser_set_current_name (GTK_FILE_CHOOSER (dialog), ui->priv->default_file_name);
-    g_free (directory);
-
-    /* Filter to only show images by default */
-    filter = gtk_file_filter_new ();
-    gtk_file_filter_set_name (filter,
-                              /* Save dialog: Filter name to show only image files */
-                              _("Image Files"));
-    gtk_file_filter_add_pixbuf_formats (filter);
-    gtk_file_filter_add_mime_type (filter, "application/pdf");
-    gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (dialog), filter);
-    filter = gtk_file_filter_new ();
-    gtk_file_filter_set_name (filter,
-                              /* Save dialog: Filter name to show all files */
-                              _("All Files"));
-    gtk_file_filter_add_pattern (filter, "*");
-    gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (dialog), filter);
-
-    expander = gtk_expander_new_with_mnemonic (/* */
-                                 _("Select File _Type"));
-    gtk_expander_set_spacing (GTK_EXPANDER (expander), 5);
-    gtk_file_chooser_set_extra_widget (GTK_FILE_CHOOSER (dialog), expander);
-  
-    extension = strstr (ui->priv->default_file_name, ".");
-    if (!extension)
-        extension = "";
-
-    file_type_store = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_STRING);
-    for (i = 0; file_types[i].label; i++) {
-        gtk_list_store_append (file_type_store, &iter);
-        gtk_list_store_set (file_type_store, &iter, 0, file_types[i].label, 1, file_types[i].extension, -1);
-    }
-
-    file_type_view = gtk_tree_view_new_with_model (GTK_TREE_MODEL (file_type_store));
-    gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (file_type_view), FALSE);
-    gtk_tree_view_set_rules_hint (GTK_TREE_VIEW (file_type_view), TRUE);
-    column = gtk_tree_view_column_new_with_attributes ("",
-                                                       gtk_cell_renderer_text_new (),
-                                                       "text", 0, NULL);
-    gtk_tree_view_append_column (GTK_TREE_VIEW (file_type_view), column);
-    gtk_container_add (GTK_CONTAINER (expander), file_type_view);
-
-    if (gtk_tree_model_get_iter_first (GTK_TREE_MODEL (file_type_store), &iter)) {
-        do {
-            gchar *e;
-            gtk_tree_model_get (GTK_TREE_MODEL (file_type_store), &iter, 1, &e, -1);
-            if (strcmp (extension, e) == 0)
-                gtk_tree_selection_select_iter (gtk_tree_view_get_selection (GTK_TREE_VIEW (file_type_view)), &iter);
-            g_free (e);
-        } while (gtk_tree_model_iter_next (GTK_TREE_MODEL (file_type_store), &iter));
-    }
-    g_signal_connect (gtk_tree_view_get_selection (GTK_TREE_VIEW (file_type_view)),
-                      "changed",
-                      G_CALLBACK (on_file_type_changed),
-                      dialog);
-
-    gtk_widget_show_all (expander);
-
-    response = gtk_dialog_run (GTK_DIALOG (dialog));
-    if (response == GTK_RESPONSE_ACCEPT) {
-        gchar *uri;
-
-        uri = gtk_file_chooser_get_uri (GTK_FILE_CHOOSER (dialog));
-        g_signal_emit (G_OBJECT (ui), signals[SAVE], 0, uri);
+    save_document (ui, FALSE);
+}
 
-        g_free (uri);
-    }
 
-    gconf_client_set_string (ui->priv->client, GCONF_DIR "/save_directory",
-                             gtk_file_chooser_get_current_folder (GTK_FILE_CHOOSER (dialog)),
-                             NULL);
-  
-    gtk_widget_destroy (dialog);
+void save_as_file_button_clicked_cb (GtkWidget *widget, SimpleScan *ui);
+G_MODULE_EXPORT
+void
+save_as_file_button_clicked_cb (GtkWidget *widget, SimpleScan *ui)
+{
+    save_document (ui, TRUE);
 }
 
 
@@ -1063,11 +1240,10 @@ help_contents_menuitem_activate_cb (GtkWidget *widget, SimpleScan *ui)
 
     if (error)
     {
-        ui_show_error (ui,
-                       /* Error message displayed when unable to launch help browser */
-                       _("Unable to open help file"),
-                       error->message,
-                      FALSE);
+        show_error_dialog (ui,
+                           /* Error message displayed when unable to launch help browser */
+                           _("Unable to open help file"),
+                           error->message);
         g_clear_error (&error);
     }
 }
@@ -1116,14 +1292,19 @@ about_menuitem_activate_cb (GtkWidget *widget, SimpleScan *ui)
 }
 
 
-static void
+static gboolean
 quit (SimpleScan *ui)
 {
     char *device;
     gint paper_width = 0, paper_height = 0;
     gint i;
 
-    // FIXME: Warn if document with unsaved changes
+    if (!prompt_to_save (ui,
+                         /* Text in dialog warning when a document is about to be lost */
+                         _("Save document before quitting?"),
+                         /* Button in dialog to quit and discard unsaved document */
+                         _("Quit without Saving")))
+        return FALSE;
 
     device = get_selected_device (ui);
     if (device) {
@@ -1151,6 +1332,8 @@ quit (SimpleScan *ui)
     gconf_client_set_int (ui->priv->client, GCONF_DIR "/page_dpi", ui->priv->default_page_dpi, NULL);
    
     g_signal_emit (G_OBJECT (ui), signals[QUIT], 0);
+
+    return TRUE;
 }
 
 
@@ -1177,6 +1360,24 @@ simple_scan_window_configure_event_cb (GtkWidget *widget, GdkEventConfigure *eve
 }
 
 
+static void
+info_bar_response_cb (GtkWidget *widget, gint response_id, SimpleScan *ui)
+{
+    if (response_id == 1) {
+        gtk_widget_grab_focus (ui->priv->device_combo);
+        gtk_window_present (GTK_WINDOW (ui->priv->preferences_dialog));
+    }
+    else {
+        ui->priv->have_error = FALSE;
+        g_free (ui->priv->error_title);
+        ui->priv->error_title = NULL;
+        g_free (ui->priv->error_text);
+        ui->priv->error_text = NULL;
+        update_info_bar (ui);      
+    }
+}
+
+
 gboolean simple_scan_window_window_state_event_cb (GtkWidget *widget, GdkEventWindowState *event, SimpleScan *ui);
 G_MODULE_EXPORT
 gboolean
@@ -1193,8 +1394,7 @@ G_MODULE_EXPORT
 gboolean
 window_delete_event_cb (GtkWidget *widget, GdkEvent *event, SimpleScan *ui)
 {
-    quit (ui);
-    return TRUE;
+    return !quit (ui);
 }
 
 
@@ -1290,10 +1490,21 @@ set_dpi_combo (GtkWidget *combo, gint default_dpi, gint current_dpi)
 
 
 static void
+needs_saving_cb (Book *book, GParamSpec *param, SimpleScan *ui)
+{
+    gtk_widget_set_sensitive (ui->priv->save_menuitem, book_get_needs_saving (book));
+    gtk_widget_set_sensitive (ui->priv->save_toolbutton, book_get_needs_saving (book));
+    if (book_get_needs_saving (book))
+        gtk_widget_set_sensitive (ui->priv->save_as_menuitem, TRUE);
+}
+
+
+static void
 ui_load (SimpleScan *ui)
 {
     GtkBuilder *builder;
     GError *error = NULL;
+    GtkWidget *hbox;
     GtkCellRenderer *renderer;
     gchar *device, *document_type, *scan_direction, *page_side;
     gint dpi, paper_width, paper_height;
@@ -1306,12 +1517,11 @@ ui_load (SimpleScan *ui)
     gtk_builder_add_from_file (builder, UI_DIR "simple-scan.ui", &error);
     if (error) {
         g_critical ("Unable to load UI: %s\n", error->message);
-        ui_show_error (ui,
-                       /* Title of dialog when cannot load required files */
-                       _("Files missing"),
-                       /* Description in dialog when cannot load required files */
-                       _("Please check your installation"),
-                       FALSE);
+        show_error_dialog (ui,
+                           /* Title of dialog when cannot load required files */
+                           _("Files missing"),
+                           /* Description in dialog when cannot load required files */
+                           _("Please check your installation"));
         exit (1);
     }
     gtk_builder_connect_signals (builder, ui);
@@ -1320,6 +1530,9 @@ ui_load (SimpleScan *ui)
     ui->priv->main_vbox = GTK_WIDGET (gtk_builder_get_object (builder, "main_vbox"));
     ui->priv->page_delete_menuitem = GTK_WIDGET (gtk_builder_get_object (builder, "page_delete_menuitem"));
     ui->priv->crop_rotate_menuitem = GTK_WIDGET (gtk_builder_get_object (builder, "crop_rotate_menuitem"));
+    ui->priv->save_menuitem = GTK_WIDGET (gtk_builder_get_object (builder, "save_menuitem"));
+    ui->priv->save_as_menuitem = GTK_WIDGET (gtk_builder_get_object (builder, "save_as_menuitem"));
+    ui->priv->save_toolbutton = GTK_WIDGET (gtk_builder_get_object (builder, "save_toolbutton"));
     ui->priv->stop_menuitem = GTK_WIDGET (gtk_builder_get_object (builder, "stop_scan_menuitem"));
     ui->priv->stop_toolbutton = GTK_WIDGET (gtk_builder_get_object (builder, "stop_toolbutton"));
 
@@ -1345,6 +1558,28 @@ ui_load (SimpleScan *ui)
     ui->priv->paper_size_combo = GTK_WIDGET (gtk_builder_get_object (builder, "paper_size_combo"));
     ui->priv->paper_size_model = gtk_combo_box_get_model (GTK_COMBO_BOX (ui->priv->paper_size_combo));
 
+    /* Add InfoBar (not supported in Glade) */
+    ui->priv->info_bar = gtk_info_bar_new ();
+    g_signal_connect (ui->priv->info_bar, "response", G_CALLBACK (info_bar_response_cb), ui);  
+    gtk_box_pack_start (GTK_BOX(ui->priv->main_vbox), ui->priv->info_bar, FALSE, TRUE, 0);
+    hbox = gtk_hbox_new (FALSE, 12);
+    gtk_container_add (GTK_CONTAINER (gtk_info_bar_get_content_area (GTK_INFO_BAR (ui->priv->info_bar))), hbox);
+    gtk_widget_show (hbox);
+
+    ui->priv->info_bar_image = gtk_image_new_from_stock (GTK_STOCK_DIALOG_WARNING, GTK_ICON_SIZE_DIALOG);
+    gtk_box_pack_start (GTK_BOX(hbox), ui->priv->info_bar_image, FALSE, TRUE, 0);
+    gtk_widget_show (ui->priv->info_bar_image);
+
+    ui->priv->info_bar_label = gtk_label_new (NULL);
+    gtk_misc_set_alignment (GTK_MISC (ui->priv->info_bar_label), 0.0, 0.5);
+    gtk_box_pack_start (GTK_BOX(hbox), ui->priv->info_bar_label, TRUE, TRUE, 0);
+    gtk_widget_show (ui->priv->info_bar_label);
+
+    ui->priv->info_bar_close_button = gtk_info_bar_add_button (GTK_INFO_BAR (ui->priv->info_bar), GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE);
+    ui->priv->info_bar_change_scanner_button = gtk_info_bar_add_button (GTK_INFO_BAR (ui->priv->info_bar),
+                                                                        /* Button in error infobar to open preferences dialog and change scanner */
+                                                                        _("Change _Scanner"), 1);
+
     GtkTreeIter iter;
     gtk_list_store_append (GTK_LIST_STORE (ui->priv->paper_size_model), &iter);
     gtk_list_store_set (GTK_LIST_STORE (ui->priv->paper_size_model), &iter, 0, 0, 1, 0, 2,
@@ -1451,6 +1686,8 @@ ui_load (SimpleScan *ui)
 
     if (book_get_n_pages (ui->priv->book) == 0)
         add_default_page (ui);
+    book_set_needs_saving (ui->priv->book, FALSE);
+    g_signal_connect (ui->priv->book, "notify::needs-saving", G_CALLBACK (needs_saving_cb), ui);
 }
 
 
@@ -1495,28 +1732,13 @@ ui_set_scanning (SimpleScan *ui, gboolean scanning)
 void
 ui_show_error (SimpleScan *ui, const gchar *error_title, const gchar *error_text, gboolean change_scanner_hint)
 {
-    GtkWidget *dialog;
-
-    dialog = gtk_message_dialog_new (GTK_WINDOW (ui->priv->window),
-                                     GTK_DIALOG_MODAL,
-                                     GTK_MESSAGE_WARNING,
-                                     GTK_BUTTONS_NONE,
-                                     "%s", error_title);
-    if (change_scanner_hint)
-        gtk_dialog_add_button (GTK_DIALOG (dialog),
-                               /* Button in error dialog to open prefereces dialog and change scanner */
-                               _("Change _Scanner"),
-                               1);
-    gtk_dialog_add_button (GTK_DIALOG (dialog), GTK_STOCK_CLOSE, 0);
-    gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog),
-                                              "%s", error_text);
-
-    if (gtk_dialog_run (GTK_DIALOG (dialog)) == 1) {
-        gtk_widget_grab_focus (ui->priv->device_combo);
-        gtk_window_present (GTK_WINDOW (ui->priv->preferences_dialog));        
-    }
-
-    gtk_widget_destroy (dialog);
+    ui->priv->have_error = TRUE;
+    g_free (ui->priv->error_title);
+    ui->priv->error_title = g_strdup (error_title);
+    g_free (ui->priv->error_text);
+    ui->priv->error_text = g_strdup (error_text);
+    ui->priv->error_change_scanner_hint = change_scanner_hint;
+    update_info_bar (ui);
 }
 
 
@@ -1606,14 +1828,6 @@ ui_class_init (SimpleScanClass *klass)
                       NULL, NULL,
                       g_cclosure_marshal_VOID__VOID,
                       G_TYPE_NONE, 0);
-    signals[SAVE] =
-        g_signal_new ("save",
-                      G_TYPE_FROM_CLASS (klass),
-                      G_SIGNAL_RUN_LAST,
-                      G_STRUCT_OFFSET (SimpleScanClass, save),
-                      NULL, NULL,
-                      g_cclosure_marshal_VOID__STRING,
-                      G_TYPE_NONE, 1, G_TYPE_STRING);
     signals[EMAIL] =
         g_signal_new ("email",
                       G_TYPE_FROM_CLASS (klass),
@@ -1650,5 +1864,5 @@ ui_init (SimpleScan *ui)
     ui->priv->document_hint = g_strdup ("photo");
     ui->priv->default_file_name = g_strdup (_("Scanned Document.pdf"));
     ui->priv->scanning = FALSE;
-    ui_load (ui);   
+    ui_load (ui);
 }
diff --git a/src/ui.h b/src/ui.h
index 41d551f..d43c187 100644
--- a/src/ui.h
+++ b/src/ui.h
@@ -36,7 +36,6 @@ typedef struct
 
     void (*start_scan) (SimpleScan *ui, ScanOptions *options);
     void (*stop_scan) (SimpleScan *ui);
-    void (*save) (SimpleScan *ui, const gchar *format);
     void (*email) (SimpleScan *ui, const gchar *profile);
     void (*quit) (SimpleScan *ui);
 } SimpleScanClass;