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Diffstat (limited to 'src/scanner.vala')
| -rw-r--r-- | src/scanner.vala | 1472 |
1 files changed, 1472 insertions, 0 deletions
diff --git a/src/scanner.vala b/src/scanner.vala new file mode 100644 index 0000000..02aa69d --- /dev/null +++ b/src/scanner.vala @@ -0,0 +1,1472 @@ +/* + * Copyright (C) 2009-2011 Canonical Ltd. + * Author: Robert Ancell <robert.ancell@canonical.com> + * + * 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. See http://www.gnu.org/copyleft/gpl.html the full text of the + * license. + */ + +/* TODO: Could indicate the start of the next page immediately after the last page is received (i.e. before the sane_cancel()) */ + +public class ScanDevice +{ + public string name; + public string label; +} + +public class ScanPageInfo +{ + /* Width, height in pixels */ + public int width; + public int height; + + /* Bit depth */ + public int depth; + + /* Number of colour channels */ + public int n_channels; + + /* Resolution */ + public double dpi; + + /* The device this page came from */ + public string device; +} + +public class ScanLine +{ + /* Line number */ + public int number; + + /* Number of lines in this packet */ + public int n_lines; + + /* Width in pixels and format */ + public int width; + public int depth; + + /* Channel for this line or -1 for all channels */ + public int channel; + + /* Raw line data */ + public uchar[] data; + public int data_length; +} + +public enum ScanMode +{ + DEFAULT, + COLOR, + GRAY, + LINEART +} + +public enum ScanType +{ + SINGLE, + ADF_FRONT, + ADF_BACK, + ADF_BOTH +} + +public class ScanOptions +{ + public int dpi; + public ScanMode scan_mode; + public int depth; + public ScanType type; + public int paper_width; + public int paper_height; +} + +private class ScanJob +{ + public string device; + public double dpi; + public ScanMode scan_mode; + public int depth; + public ScanType type; + public int page_width; + public int page_height; +} + +private class Request {} + +private class RequestRedetect : Request {} + +private class RequestCancel : Request {} + +private class RequestStartScan : Request +{ + public ScanJob job; +} + +private class RequestQuit : Request {} + +private class Credentials +{ + public string username; + public string password; +} + +private enum ScanState +{ + IDLE = 0, + REDETECT, + OPEN, + GET_OPTION, + START, + GET_PARAMETERS, + READ +} + +private class Notify +{ + public virtual void run (Scanner scanner) {} +} + +private class NotifyScanningChanged : Notify +{ + public override void run (Scanner scanner) { scanner.scanning_changed (); } +} + +private class NotifyUpdateDevices : Notify +{ + public NotifyUpdateDevices (owned List<ScanDevice> devices) { this.devices = (owned) devices; } + private List<ScanDevice> devices; + public override void run (Scanner scanner) { scanner.update_devices (devices); } +} + +private class NotifyRequestAuthorization : Notify +{ + public NotifyRequestAuthorization (string resource) { this.resource = resource; } + private string resource; + public override void run (Scanner scanner) { scanner.request_authorization (resource); } +} + +private class NotifyScanFailed : Notify +{ + public NotifyScanFailed (int error_code, string error_string) { this.error_code = error_code; this.error_string = error_string; } + private int error_code; + private string error_string; + public override void run (Scanner scanner) { scanner.scan_failed (error_code, error_string); } +} + +private class NotifyDocumentDone : Notify +{ + public override void run (Scanner scanner) { scanner.document_done (); } +} + +private class NotifyExpectPage : Notify +{ + public override void run (Scanner scanner) { scanner.expect_page (); } +} + +private class NotifyGotPageInfo : Notify +{ + public NotifyGotPageInfo (ScanPageInfo info) { this.info = info; } + private ScanPageInfo info; + public override void run (Scanner scanner) { scanner.got_page_info (info); } +} + +private class NotifyPageDone : Notify +{ + public override void run (Scanner scanner) { scanner.page_done (); } +} + +private class NotifyGotLine : Notify +{ + public NotifyGotLine (ScanLine line) { this.line = line; } + private ScanLine line; + public override void run (Scanner scanner) + { + scanner.got_line (line); + } +} + +public class Scanner +{ + /* Singleton object */ + private static Scanner scanner_object = null; + + /* Thread communicating with SANE */ + private unowned Thread<void*> thread; + + /* Queue of requests from main thread */ + private AsyncQueue<Request> request_queue; + + /* Queue of events to notify in main queue */ + private AsyncQueue<Notify> notify_queue; + + /* Queue of responses to authorization requests */ + private AsyncQueue<Credentials> authorize_queue; + + private string? default_device; + + private ScanState state; + private bool need_redetect; + + private List<ScanJob> job_queue; + + /* Handle to SANE device */ + private Sane.Handle handle; + private bool have_handle; + private string? current_device; + + private Sane.Parameters parameters; + + /* Last option read */ + private Sane.Int option_index; + + /* Option index for scan area */ + private Sane.Int br_x_option_index; + private Sane.Int br_y_option_index; + + /* Buffer for received line */ + private uchar[] buffer; + private int n_used; + + //private int bytes_remaining; + private int line_count; + private int pass_number; + private int page_number; + private int notified_page; + + private bool scanning; + + public signal void update_devices (List<ScanDevice> devices); + public signal void request_authorization (string resource); + public signal void expect_page (); + public signal void got_page_info (ScanPageInfo info); + public signal void got_line (ScanLine line); + public signal void scan_failed (int error_code, string error_string); + public signal void page_done (); + public signal void document_done (); + public signal void scanning_changed (); + + private Scanner () + { + request_queue = new AsyncQueue<Request> (); + notify_queue = new AsyncQueue<Notify> (); + authorize_queue = new AsyncQueue<Credentials> (); + } + + public static Scanner get_instance () + { + if (scanner_object == null) + scanner_object = new Scanner (); + return scanner_object; + } + + private bool notify_idle_cb () + { + var notification = notify_queue.pop (); + notification.run (this); + return false; + } + + private void notify (Notify notification) + { + notify_queue.push (notification); + Idle.add (notify_idle_cb); + } + + private void set_scanning (bool is_scanning) + { + if ((scanning && !is_scanning) || (!scanning && is_scanning)) + { + scanning = is_scanning; + scanning_changed (); + notify (new NotifyScanningChanged ()); + } + } + + private static int get_device_weight (string device) + { + /* NOTE: This is using trends in the naming of SANE devices, SANE should be able to provide this information better */ + + /* Use webcams as a last resort */ + if (device.has_prefix ("vfl:")) + return 2; + + /* Use locally connected devices first */ + if (device.contains ("usb")) + return 0; + + return 1; + } + + private static int compare_devices (ScanDevice device1, ScanDevice device2) + { + /* TODO: Should do some fuzzy matching on the last selected device and set that to the default */ + + var weight1 = get_device_weight (device1.name); + var weight2 = get_device_weight (device2.name); + if (weight1 != weight2) + return weight1 - weight2; + + return strcmp (device1.label, device2.label); + } + + private void do_redetect () + { + unowned Sane.Device[] device_list = null; + var status = Sane.get_devices (out device_list, false); + debug ("sane_get_devices () -> %s", Sane.status_to_string (status)); + if (status != Sane.Status.GOOD) + { + warning ("Unable to get SANE devices: %s", Sane.strstatus(status)); + need_redetect = false; + state = ScanState.IDLE; + return; + } + + List<ScanDevice> devices = null; + for (var i = 0; device_list[i] != null; i++) + { + debug ("Device: name=\"%s\" vendor=\"%s\" model=\"%s\" type=\"%s\"", + device_list[i].name, device_list[i].vendor, device_list[i].model, device_list[i].type); + + var scan_device = new ScanDevice (); + scan_device.name = device_list[i].name; + + /* Abbreviate HP as it is a long string and does not match what is on the physical scanner */ + var vendor = device_list[i].vendor; + if (vendor == "Hewlett-Packard") + vendor = "HP"; + + scan_device.label = "%s %s".printf (vendor, device_list[i].model); + /* Replace underscores in name */ + scan_device.label.replace ("_", " "); + + devices.append (scan_device); + } + + /* Sort devices by priority */ + devices.sort (compare_devices); + + need_redetect = false; + state = ScanState.IDLE; + + if (devices != null) + { + var device = devices.nth_data (0); + default_device = device.name; + } + else + default_device = null; + + notify (new NotifyUpdateDevices ((owned) devices)); + } + + private bool set_default_option (Sane.Handle handle, Sane.OptionDescriptor option, Sane.Int option_index) + { + /* Check if supports automatic option */ + if ((option.cap & Sane.Capability.AUTOMATIC) == 0) + return false; + + var status = Sane.control_option (handle, option_index, Sane.Action.SET_AUTO, null, null); + debug ("sane_control_option (%d, SANE_ACTION_SET_AUTO) -> %s", option_index, Sane.status_to_string (status)); + if (status != Sane.Status.GOOD) + warning ("Error setting default option %s: %s", option.name, Sane.strstatus(status)); + + return status == Sane.Status.GOOD; + } + + private void set_bool_option (Sane.Handle handle, Sane.OptionDescriptor option, Sane.Int option_index, bool value, out bool result) + { + return_if_fail (option.type == Sane.ValueType.BOOL); + + Sane.Bool v = (Sane.Bool) value; + var status = Sane.control_option (handle, option_index, Sane.Action.SET_VALUE, &v, null); + result = (bool) v; + debug ("sane_control_option (%d, SANE_ACTION_SET_VALUE, %s) -> (%s, %s)", option_index, value ? "SANE_TRUE" : "SANE_FALSE", Sane.status_to_string (status), result ? "SANE_TRUE" : "SANE_FALSE"); + } + + private void set_int_option (Sane.Handle handle, Sane.OptionDescriptor option, Sane.Int option_index, int value, out int result) + { + return_if_fail (option.type == Sane.ValueType.INT); + + Sane.Int v = (Sane.Int) value; + if (option.constraint_type == Sane.ConstraintType.RANGE) + { + if (option.constraint.range.quant != 0) + v *= option.constraint.range.quant; + if (v < option.constraint.range.min) + v = option.constraint.range.min; + if (v > option.constraint.range.max) + v = option.constraint.range.max; + } + else if (option.constraint_type == Sane.ConstraintType.WORD_LIST) + { + int distance = int.MAX, nearest = 0; + + /* Find nearest value to requested */ + for (var i = 0; i < option.constraint.word_list[0]; i++) + { + var x = (int) option.constraint.word_list[i+1]; + var d = (x - v).abs (); + if (d < distance) + { + distance = d; + nearest = x; + } + } + v = (Sane.Int) nearest; + } + + var status = Sane.control_option (handle, option_index, Sane.Action.SET_VALUE, &v, null); + debug ("sane_control_option (%d, SANE_ACTION_SET_VALUE, %d) -> (%s, %d)", option_index, value, Sane.status_to_string (status), v); + result = v; + } + + private void set_fixed_option (Sane.Handle handle, Sane.OptionDescriptor option, Sane.Int option_index, double value, out double result) + { + double v = value; + Sane.Fixed v_fixed; + + return_if_fail (option.type == Sane.ValueType.FIXED); + + if (option.constraint_type == Sane.ConstraintType.RANGE) + { + double min = Sane.UNFIX (option.constraint.range.min); + double max = Sane.UNFIX (option.constraint.range.max); + + if (v < min) + v = min; + if (v > max) + v = max; + } + else if (option.constraint_type == Sane.ConstraintType.WORD_LIST) + { + double distance = double.MAX, nearest = 0.0; + + /* Find nearest value to requested */ + for (var i = 0; i < option.constraint.word_list[0]; i++) + { + double x = Sane.UNFIX (option.constraint.word_list[i+1]); + if (Math.fabs (x - v) < distance) + { + distance = Math.fabs (x - v); + nearest = x; + } + } + v = nearest; + } + + v_fixed = Sane.FIX (v); + var status = Sane.control_option (handle, option_index, Sane.Action.SET_VALUE, &v_fixed, null); + debug ("sane_control_option (%d, SANE_ACTION_SET_VALUE, %f) -> (%s, %f)", option_index, value, Sane.status_to_string (status), Sane.UNFIX (v_fixed)); + + result = Sane.UNFIX (v_fixed); + } + + private bool set_string_option (Sane.Handle handle, Sane.OptionDescriptor option, Sane.Int option_index, string value, out string result) + { + return_val_if_fail (option.type == Sane.ValueType.STRING, false); + + var s = new char[option.size]; + var i = 0; + for (; i < (option.size - 1) && value[i] != '\0'; i++) + s[i] = value[i]; + s[i] = '\0'; + var status = Sane.control_option (handle, option_index, Sane.Action.SET_VALUE, s, null); + result = (string) s; + debug ("sane_control_option (%d, SANE_ACTION_SET_VALUE, \"%s\") -> (%s, \"%s\")", option_index, value, Sane.status_to_string (status), result); + + return status == Sane.Status.GOOD; + } + + private bool set_constrained_string_option (Sane.Handle handle, Sane.OptionDescriptor option, Sane.Int option_index, string[] values, out string result) + { + return_val_if_fail (option.type == Sane.ValueType.STRING, false); + return_val_if_fail (option.constraint_type == Sane.ConstraintType.STRING_LIST, false); + + for (var i = 0; values[i] != null; i++) + { + var j = 0; + for (; option.constraint.string_list[j] != null; j++) + { + if (values[i] == option.constraint.string_list[j]) + break; + } + + if (option.constraint.string_list[j] != null) + return set_string_option (handle, option, option_index, values[i], out result); + } + + return false; + } + + private void log_option (Sane.Int index, Sane.OptionDescriptor option) + { + var s = "Option %d:".printf (index); + + if (option.name != "") + s += " name='%s'".printf (option.name); + + if (option.title != "") + s += " title='%s'".printf (option.title); + + switch (option.type) + { + case Sane.ValueType.BOOL: + s += " type=bool"; + break; + case Sane.ValueType.INT: + s += " type=int"; + break; + case Sane.ValueType.FIXED: + s += " type=fixed"; + break; + case Sane.ValueType.STRING: + s += " type=string"; + break; + case Sane.ValueType.BUTTON: + s += " type=button"; + break; + case Sane.ValueType.GROUP: + s += " type=group"; + break; + default: + s += " type=%d".printf (option.type); + break; + } + + s += " size=%d".printf (option.size); + + switch (option.unit) + { + case Sane.Unit.NONE: + break; + case Sane.Unit.PIXEL: + s += " unit=pixels"; + break; + case Sane.Unit.BIT: + s += " unit=bits"; + break; + case Sane.Unit.MM: + s += " unit=mm"; + break; + case Sane.Unit.DPI: + s += " unit=dpi"; + break; + case Sane.Unit.PERCENT: + s += " unit=percent"; + break; + case Sane.Unit.MICROSECOND: + s += " unit=microseconds"; + break; + default: + s += " unit=%d".printf (option.unit); + break; + } + + switch (option.constraint_type) + { + case Sane.ConstraintType.RANGE: + if (option.type == Sane.ValueType.FIXED) + s += " min=%f, max=%f, quant=%d".printf (Sane.UNFIX (option.constraint.range.min), Sane.UNFIX (option.constraint.range.max), option.constraint.range.quant); + else + s += " min=%d, max=%d, quant=%d".printf (option.constraint.range.min, option.constraint.range.max, option.constraint.range.quant); + break; + case Sane.ConstraintType.WORD_LIST: + s += " values=["; + for (var i = 0; i < option.constraint.word_list[0]; i++) + { + if (i != 0) + s += ", "; + if (option.type == Sane.ValueType.INT) + s += "%d".printf (option.constraint.word_list[i+1]); + else + s += "%f".printf (Sane.UNFIX (option.constraint.word_list[i+1])); + } + s += "]"; + break; + case Sane.ConstraintType.STRING_LIST: + s += " values=["; + for (var i = 0; option.constraint.string_list[i] != null; i++) + { + if (i != 0) + s += ", "; + s += "\"%s\"".printf (option.constraint.string_list[i]); + } + s += "]"; + break; + default: + break; + } + + var cap = option.cap; + if (cap != 0) + { + s += " cap="; + if ((cap & Sane.Capability.SOFT_SELECT) != 0) + { + if (s != "") + s += ","; + s += "soft-select"; + cap &= ~Sane.Capability.SOFT_SELECT; + } + if ((cap & Sane.Capability.HARD_SELECT) != 0) + { + if (s != "") + s += ","; + s += "hard-select"; + cap &= ~Sane.Capability.HARD_SELECT; + } + if ((cap & Sane.Capability.SOFT_DETECT) != 0) + { + if (s != "") + s += ","; + s += "soft-detect"; + cap &= ~Sane.Capability.SOFT_DETECT; + } + if ((cap & Sane.Capability.EMULATED) != 0) + { + if (s != "") + s += ","; + s += "emulated"; + cap &= ~Sane.Capability.EMULATED; + } + if ((cap & Sane.Capability.AUTOMATIC) != 0) + { + if (s != "") + s += ","; + s += "automatic"; + cap &= ~Sane.Capability.AUTOMATIC; + } + if ((cap & Sane.Capability.INACTIVE) != 0) + { + if (s != "") + s += ","; + s += "inactive"; + cap &= ~Sane.Capability.INACTIVE; + } + if ((cap & Sane.Capability.ADVANCED) != 0) + { + if (s != "") + s += ","; + s += "advanced"; + cap &= ~Sane.Capability.ADVANCED; + } + /* Unknown capabilities */ + if (cap != 0) + { + if (s != "") + s += ","; + s += "%x".printf (cap); + } + } + + debug ("%s", s); + + if (option.desc != null) + debug (" Description: %s", option.desc); + } + + private static void authorization_cb (string resource, char[] username, char[] password) + { + scanner_object.notify (new NotifyRequestAuthorization (resource)); + + var credentials = scanner_object.authorize_queue.pop (); + for (var i = 0; credentials.username[i] != '\0' && i < Sane.MAX_USERNAME_LEN; i++) + username[i] = credentials.username[i]; + for (var i = 0; credentials.password[i] != '\0' && i < Sane.MAX_PASSWORD_LEN; i++) + password[i] = credentials.password[i]; + } + + public void authorize (string username, string password) + { + var credentials = new Credentials (); + credentials.username = username; + credentials.password = password; + authorize_queue.push (credentials); + } + + private void close_device () + { + if (have_handle) + { + Sane.cancel (handle); + debug ("sane_cancel ()"); + + Sane.close (handle); + debug ("sane_close ()"); + have_handle = false; + } + + buffer = null; + job_queue = null; + + set_scanning (false); + } + + private void fail_scan (int error_code, string error_string) + { + close_device (); + state = ScanState.IDLE; + notify (new NotifyScanFailed (error_code, error_string)); + } + + private bool handle_requests () + { + /* Redetect when idle */ + if (state == ScanState.IDLE && need_redetect) + state = ScanState.REDETECT; + + /* Process all requests */ + int request_count = 0; + while (true) + { + Request request; + if ((state == ScanState.IDLE && request_count == 0) || + request_queue.length () > 0) + request = request_queue.pop (); + else + return true; + + debug ("Processing request"); + request_count++; + + if (request is RequestStartScan) + { + var r = (RequestStartScan) request; + job_queue.append (r.job); + } + else if (request is RequestCancel) + { + fail_scan (Sane.Status.CANCELLED, "Scan cancelled - do not report this error"); + } + else if (request is RequestQuit) + { + close_device (); + return false; + } + } + } + + private void do_open () + { + var job = (ScanJob) job_queue.data; + + line_count = 0; + pass_number = 0; + page_number = 0; + notified_page = -1; + option_index = 0; + br_x_option_index = 0; + br_y_option_index = 0; + + if (job.device == null && default_device != null) + job.device = default_device; + + if (job.device == null) + { + warning ("No scan device available"); + fail_scan (0, + /* Error displayed when no scanners to scan with */ + _("No scanners available. Please connect a scanner.")); + return; + } + + /* See if we can use the already open device */ + if (have_handle) + { + if (current_device == job.device) + { + state = ScanState.GET_OPTION; + return; + } + + Sane.close (handle); + debug ("sane_close ()"); + have_handle = false; + } + + current_device = null; + + have_handle = false; + var status = Sane.open (job.device, out handle); + debug ("sane_open (\"%s\") -> %s", job.device, Sane.status_to_string (status)); + + if (status != Sane.Status.GOOD) + { + warning ("Unable to get open device: %s", Sane.strstatus (status)); + fail_scan (status, + /* Error displayed when cannot connect to scanner */ + _("Unable to connect to scanner")); + return; + } + have_handle = true; + + current_device = job.device; + state = ScanState.GET_OPTION; + } + + private void do_get_option () + { + var job = (ScanJob) job_queue.data; + + var option = Sane.get_option_descriptor (handle, option_index); + debug ("sane_get_option_descriptor (%d)", option_index); + var index = option_index; + option_index++; + + if (option == null) + { + /* Always use maximum scan area - some scanners default to using partial areas. This should be patched in sane-backends */ + if (br_x_option_index != 0) + { + option = Sane.get_option_descriptor (handle, br_x_option_index); + debug ("sane_get_option_descriptor (%d)", br_x_option_index); + if (option.constraint_type == Sane.ConstraintType.RANGE) + { + if (option.type == Sane.ValueType.FIXED) + set_fixed_option (handle, option, br_x_option_index, Sane.UNFIX (option.constraint.range.max), null); + else + set_int_option (handle, option, br_x_option_index, option.constraint.range.max, null); + } + } + if (br_y_option_index != 0) + { + option = Sane.get_option_descriptor (handle, br_y_option_index); + debug ("sane_get_option_descriptor (%d)", br_y_option_index); + if (option.constraint_type == Sane.ConstraintType.RANGE) + { + if (option.type == Sane.ValueType.FIXED) + set_fixed_option (handle, option, br_y_option_index, Sane.UNFIX (option.constraint.range.max), null); + else + set_int_option (handle, option, br_y_option_index, option.constraint.range.max, null); + } + } + + state = ScanState.START; + return; + } + + log_option (index, option); + + /* Ignore groups */ + if (option.type == Sane.ValueType.GROUP) + return; + + /* Option disabled */ + if ((option.cap & Sane.Capability.INACTIVE) != 0) + return; + + /* Some options are unnammed (e.g. Option 0) */ + if (option.name == null) + return; + + if (option.name == Sane.NAME_SCAN_RESOLUTION) + { + if (option.type == Sane.ValueType.FIXED) + set_fixed_option (handle, option, index, job.dpi, out job.dpi); + else + { + int dpi; + set_int_option (handle, option, index, (int) job.dpi, out dpi); + job.dpi = dpi; + } + } + else if (option.name == Sane.NAME_SCAN_SOURCE) + { + string[] flatbed_sources = + { + "Auto", + Sane.I18N ("Auto"), + "Flatbed", + Sane.I18N ("Flatbed"), + "FlatBed", + "Normal", + Sane.I18N ("Normal") + }; + + string[] adf_sources = + { + "Automatic Document Feeder", + Sane.I18N ("Automatic Document Feeder"), + "ADF", + "Automatic Document Feeder(left aligned)", /* Seen in the proprietary brother3 driver */ + "Automatic Document Feeder(centrally aligned)" /* Seen in the proprietary brother3 driver */ + }; + + string[] adf_front_sources = + { + "ADF Front", + Sane.I18N ("ADF Front") + }; + + string[] adf_back_sources = + { + "ADF Back", + Sane.I18N ("ADF Back") + }; + + string[] adf_duplex_sources = + { + "ADF Duplex", + Sane.I18N ("ADF Duplex") + }; + + switch (job.type) + { + case ScanType.SINGLE: + if (!set_default_option (handle, option, index)) + if (!set_constrained_string_option (handle, option, index, flatbed_sources, null)) + warning ("Unable to set single page source, please file a bug"); + break; + case ScanType.ADF_FRONT: + if (!set_constrained_string_option (handle, option, index, adf_front_sources, null)) + if (!!set_constrained_string_option (handle, option, index, adf_sources, null)) + warning ("Unable to set front ADF source, please file a bug"); + break; + case ScanType.ADF_BACK: + if (!set_constrained_string_option (handle, option, index, adf_back_sources, null)) + if (!set_constrained_string_option (handle, option, index, adf_sources, null)) + warning ("Unable to set back ADF source, please file a bug"); + break; + case ScanType.ADF_BOTH: + if (!set_constrained_string_option (handle, option, index, adf_duplex_sources, null)) + if (!set_constrained_string_option (handle, option, index, adf_sources, null)) + warning ("Unable to set duplex ADF source, please file a bug"); + break; + } + } + else if (option.name == "duplex") + { + if (option.type == Sane.ValueType.BOOL) + set_bool_option (handle, option, index, job.type == ScanType.ADF_BOTH, null); + } + else if (option.name == "batch-scan") + { + if (option.type == Sane.ValueType.BOOL) + set_bool_option (handle, option, index, job.type != ScanType.SINGLE, null); + } + else if (option.name == Sane.NAME_BIT_DEPTH) + { + if (job.depth > 0) + set_int_option (handle, option, index, job.depth, null); + } + else if (option.name == Sane.NAME_SCAN_MODE) + { + /* The names of scan modes often used in drivers, as taken from the sane-backends source */ + string[] color_scan_modes = + { + Sane.VALUE_SCAN_MODE_COLOR, + "Color", + "24bit Color" /* Seen in the proprietary brother3 driver */ + }; + string[] gray_scan_modes = + { + Sane.VALUE_SCAN_MODE_GRAY, + "Gray", + "Grayscale", + Sane.I18N ("Grayscale"), + "True Gray" /* Seen in the proprietary brother3 driver */ + }; + string[] lineart_scan_modes = + { + Sane.VALUE_SCAN_MODE_LINEART, + "Lineart", + "LineArt", + Sane.I18N ("LineArt"), + "Black & White", + Sane.I18N ("Black & White"), + "Binary", + Sane.I18N ("Binary"), + "Thresholded", + Sane.VALUE_SCAN_MODE_GRAY, + "Gray", + "Grayscale", + Sane.I18N ("Grayscale"), + "True Gray" /* Seen in the proprietary brother3 driver */ + }; + + switch (job.scan_mode) + { + case ScanMode.COLOR: + if (!set_constrained_string_option (handle, option, index, color_scan_modes, null)) + warning ("Unable to set Color mode, please file a bug"); + break; + case ScanMode.GRAY: + if (!set_constrained_string_option (handle, option, index, gray_scan_modes, null)) + warning ("Unable to set Gray mode, please file a bug"); + break; + case ScanMode.LINEART: + if (!set_constrained_string_option (handle, option, index, lineart_scan_modes, null)) + warning ("Unable to set Lineart mode, please file a bug"); + break; + default: + break; + } + } + /* Disable compression, we will compress after scanning */ + else if (option.name == "compression") + { + string[] disable_compression_names = + { + Sane.I18N ("None"), + Sane.I18N ("none"), + "None", + "none" + }; + + if (!set_constrained_string_option (handle, option, index, disable_compression_names, null)) + warning ("Unable to disable compression, please file a bug"); + } + else if (option.name == Sane.NAME_SCAN_BR_X) + br_x_option_index = index; + else if (option.name == Sane.NAME_SCAN_BR_Y) + br_y_option_index = index; + else if (option.name == Sane.NAME_PAGE_WIDTH) + { + if (job.page_width > 0.0) + { + if (option.type == Sane.ValueType.FIXED) + set_fixed_option (handle, option, index, job.page_width / 10.0, null); + else + set_int_option (handle, option, index, job.page_width / 10, null); + } + } + else if (option.name == Sane.NAME_PAGE_HEIGHT) + { + if (job.page_height > 0.0) + { + if (option.type == Sane.ValueType.FIXED) + set_fixed_option (handle, option, index, job.page_height / 10.0, null); + else + set_int_option (handle, option, index, job.page_height / 10, null); + } + } + + /* Test scanner options (hoping will not effect other scanners...) */ + if (current_device == "test") + { + if (option.name == "hand-scanner") + set_bool_option (handle, option, index, false, null); + else if (option.name == "three-pass") + set_bool_option (handle, option, index, false, null); + else if (option.name == "test-picture") + set_string_option (handle, option, index, "Color pattern", null); + else if (option.name == "read-delay") + set_bool_option (handle, option, index, true, null); + else if (option.name == "read-delay-duration") + set_int_option (handle, option, index, 200000, null); + } + } + + private void do_complete_document () + { + job_queue.remove_link (job_queue); + + state = ScanState.IDLE; + + /* Continue onto the next job */ + if (job_queue != null) + { + state = ScanState.OPEN; + return; + } + + /* Trigger timeout to close */ + // TODO + + notify (new NotifyDocumentDone ()); + set_scanning (false); + } + + private void do_start () + { + Sane.Status status; + + notify (new NotifyExpectPage ()); + + status = Sane.start (handle); + debug ("sane_start (page=%d, pass=%d) -> %s", page_number, pass_number, Sane.status_to_string (status)); + if (status == Sane.Status.GOOD) + state = ScanState.GET_PARAMETERS; + else if (status == Sane.Status.NO_DOCS) + do_complete_document (); + else + { + warning ("Unable to start device: %s", Sane.strstatus (status)); + fail_scan (status, + /* Error display when unable to start scan */ + _("Unable to start scan")); + } + } + + private void do_get_parameters () + { + var status = Sane.get_parameters (handle, out parameters); + debug ("sane_get_parameters () -> %s", Sane.status_to_string (status)); + if (status != Sane.Status.GOOD) + { + warning ("Unable to get device parameters: %s", Sane.strstatus (status)); + fail_scan (status, + /* Error displayed when communication with scanner broken */ + _("Error communicating with scanner")); + return; + } + + var job = (ScanJob) job_queue.data; + + debug ("Parameters: format=%s last_frame=%s bytes_per_line=%d pixels_per_line=%d lines=%d depth=%d", + Sane.frame_to_string (parameters.format), + parameters.last_frame ? "SANE_TRUE" : "SANE_FALSE", + parameters.bytes_per_line, + parameters.pixels_per_line, + parameters.lines, + parameters.depth); + + var info = new ScanPageInfo (); + info.width = parameters.pixels_per_line; + info.height = parameters.lines; + info.depth = parameters.depth; + /* Reduce bit depth if requested lower than received */ + // FIXME: This a hack and only works on 8 bit gray to 2 bit gray + if (parameters.depth == 8 && parameters.format == Sane.Frame.GRAY && job.depth == 2 && job.scan_mode == ScanMode.GRAY) + info.depth = job.depth; + info.n_channels = parameters.format == Sane.Frame.GRAY ? 1 : 3; + info.dpi = job.dpi; // FIXME: This is the requested DPI, not the actual DPI + info.device = current_device; + + if (page_number != notified_page) + { + notify (new NotifyGotPageInfo (info)); + notified_page = page_number; + } + + /* Prepare for read */ + var buffer_size = parameters.bytes_per_line + 1; /* Use +1 so buffer is not resized if driver returns one line per read */ + buffer = new uchar[buffer_size]; + n_used = 0; + line_count = 0; + pass_number = 0; + state = ScanState.READ; + } + + private void do_complete_page () + { + notify (new NotifyPageDone ()); + + var job = (ScanJob) job_queue.data; + + /* If multi-pass then scan another page */ + if (!parameters.last_frame) + { + pass_number++; + state = ScanState.START; + return; + } + + /* Go back for another page */ + if (job.type != ScanType.SINGLE) + { + page_number++; + pass_number = 0; + notify (new NotifyPageDone ()); + state = ScanState.START; + return; + } + + Sane.cancel (handle); + debug ("sane_cancel ()"); + + do_complete_document (); + } + + private void do_read () + { + var job = (ScanJob) job_queue.data; + + /* Read as many bytes as we expect */ + var n_to_read = buffer.length - n_used; + + Sane.Int n_read; + var b = (uchar *) buffer; + var status = Sane.read (handle, (uint8[]) (b + n_used), (Sane.Int) n_to_read, out n_read); + debug ("sane_read (%d) -> (%s, %d)", n_to_read, Sane.status_to_string (status), n_read); + + /* Completed read */ + if (status == Sane.Status.EOF) + { + if (parameters.lines > 0 && line_count != parameters.lines) + warning ("Scan completed with %d lines, expected %d lines", parameters.lines, parameters.lines); + if (n_used > 0) + warning ("Scan complete with %d bytes of unused data", n_used); + do_complete_page (); + return; + } + + /* Communication error */ + if (status != Sane.Status.GOOD) + { + warning ("Unable to read frame from device: %s", Sane.strstatus (status)); + fail_scan (status, + /* Error displayed when communication with scanner broken */ + _("Error communicating with scanner")); + return; + } + + bool full_read = false; + if (n_used == 0 && n_read == buffer.length) + full_read = true; + n_used += n_read; + + /* Feed out lines */ + if (n_used >= parameters.bytes_per_line) + { + var line = new ScanLine (); + switch (parameters.format) + { + case Sane.Frame.GRAY: + line.channel = 0; + break; + case Sane.Frame.RGB: + line.channel = -1; + break; + case Sane.Frame.RED: + line.channel = 0; + break; + case Sane.Frame.GREEN: + line.channel = 1; + break; + case Sane.Frame.BLUE: + line.channel = 2; + break; + } + line.width = parameters.pixels_per_line; + line.depth = parameters.depth; + line.data = (owned) buffer; + line.data_length = parameters.bytes_per_line; + line.number = line_count; + line.n_lines = n_used / line.data_length; + + line_count += line.n_lines; + + /* Increase buffer size if did full read */ + var buffer_size = buffer.length; + if (full_read) + buffer_size += parameters.bytes_per_line; + + buffer = new uchar[buffer_size]; + var n_remaining = n_used - (line.n_lines * line.data_length); + n_used = 0; + for (var i = 0; i < n_remaining; i++) + { + buffer[i] = line.data[i + (line.n_lines * line.data_length)]; + n_used++; + } + + /* Reduce bit depth if requested lower than received */ + // FIXME: This a hack and only works on 8 bit gray to 2 bit gray + if (parameters.depth == 8 && parameters.format == Sane.Frame.GRAY && + job.depth == 2 && job.scan_mode == ScanMode.GRAY) + { + uchar block = 0; + var write_offset = 0; + var block_shift = 6; + for (var i = 0; i < line.n_lines; i++) + { + var offset = i * line.data_length; + for (var x = 0; x < line.width; x++) + { + var p = line.data[offset + x]; + + uchar sample; + if (p >= 192) + sample = 3; + else if (p >= 128) + sample = 2; + else if (p >= 64) + sample = 1; + else + sample = 0; + + block |= sample << block_shift; + if (block_shift == 0) + { + line.data[write_offset] = block; + write_offset++; + block = 0; + block_shift = 6; + } + else + block_shift -= 2; + } + + /* Finish each line on a byte boundary */ + if (block_shift != 6) + { + line.data[write_offset] = block; + write_offset++; + block = 0; + block_shift = 6; + } + } + + line.data_length = (line.width * 2 + 7) / 8; + } + + notify (new NotifyGotLine (line)); + } + } + + private void* scan_thread () + { + state = ScanState.IDLE; + + Sane.Int version_code; + var status = Sane.init (out version_code, authorization_cb); + debug ("sane_init () -> %s", Sane.status_to_string (status)); + if (status != Sane.Status.GOOD) + { + warning ("Unable to initialize SANE backend: %s", Sane.strstatus(status)); + return null; + } + debug ("SANE version %d.%d.%d", + Sane.VERSION_MAJOR(version_code), + Sane.VERSION_MINOR(version_code), + Sane.VERSION_BUILD(version_code)); + + /* Scan for devices on first start */ + redetect (); + + while (handle_requests ()) + { + switch (state) + { + case ScanState.IDLE: + if (job_queue != null) + { + set_scanning (true); + state = ScanState.OPEN; + } + break; + case ScanState.REDETECT: + do_redetect (); + break; + case ScanState.OPEN: + do_open (); + break; + case ScanState.GET_OPTION: + do_get_option (); + break; + case ScanState.START: + do_start (); + break; + case ScanState.GET_PARAMETERS: + do_get_parameters (); + break; + case ScanState.READ: + do_read (); + break; + } + } + + return null; + } + + public void start () + { + try + { + thread = Thread.create<void*> (scan_thread, true); + } + catch (Error e) + { + critical ("Unable to create thread: %s", e.message); + } + } + + public void redetect () + { + if (need_redetect) + return; + need_redetect = true; + + debug ("Requesting redetection of scan devices"); + + request_queue.push (new RequestRedetect ()); + } + + public bool is_scanning () + { + return scanning; + } + + private string get_scan_mode_string (ScanMode mode) + { + switch (mode) + { + case ScanMode.DEFAULT: + return "ScanMode.DEFAULT"; + case ScanMode.COLOR: + return "ScanMode.COLOR"; + case ScanMode.GRAY: + return "ScanMode.GRAY"; + case ScanMode.LINEART: + return "ScanMode.LINEART"; + default: + return "%d".printf (mode); + } + } + + private string get_scan_type_string (ScanType type) + { + switch (type) + { + case ScanType.SINGLE: + return "ScanType.SINGLE"; + case ScanType.ADF_FRONT: + return "ScanType.ADF_FRONT"; + case ScanType.ADF_BACK: + return "ScanType.ADF_BACK"; + case ScanType.ADF_BOTH: + return "ScanType.ADF_BOTH"; + default: + return "%d".printf (type); + } + } + + public void scan (string? device, ScanOptions options) + { + debug ("Scanner.scan (\"%s\", dpi=%d, scan_mode=%s, depth=%d, type=%s, paper_width=%d, paper_height=%d)", + device != null ? device : "(null)", options.dpi, get_scan_mode_string (options.scan_mode), options.depth, + get_scan_type_string (options.type), options.paper_width, options.paper_height); + var request = new RequestStartScan (); + request.job = new ScanJob (); + request.job.device = device; + request.job.dpi = options.dpi; + request.job.scan_mode = options.scan_mode; + request.job.depth = options.depth; + request.job.type = options.type; + request.job.page_width = options.paper_width; + request.job.page_height = options.paper_height; + request_queue.push (request); + } + + public void cancel () + { + request_queue.push (new RequestCancel ()); + } + + public void free () + { + debug ("Stopping scan thread"); + + request_queue.push (new RequestQuit ()); + + if (thread != null) + thread.join (); + + Sane.exit (); + debug ("sane_exit ()"); + } +} |