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libqt5-qtbase/0001-Add-remote-print-queue-support.patch

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From f39caba21d60cb55d0c807dccd8af8578ed6c8e8 Mon Sep 17 00:00:00 2001
From: Antonio Larrosa <larrosa@kde.org>
Date: Tue, 6 Jun 2017 16:34:32 +0200
Subject: [PATCH] Add remote print queue support
Cups servers which announce themselves on avahi will be shown in
the printer dialog. This adds a delay the first time the print dialog
is opened in order to search for print queues . Because of this delay,
the remote print queue discovery is disabled by default and can be enabled
by setting the QT_ENABLE_PRINTER_DISCOVERY environment variable to 1.
The commit to Qt (which enabled the discovery by default) has
a Change-Id: Ib70715d331e8f380a3c9039011bb8521986652aa
---
.../printsupport/cups/qcupsprintengine.cpp | 35 ++++++-
.../printsupport/cups/qcupsprintersupport.cpp | 95 +++++++++++++++++--
.../printsupport/cups/qcupsprintersupport_p.h | 8 ++
.../printsupport/cups/qppdprintdevice.cpp | 30 +++++-
4 files changed, 157 insertions(+), 11 deletions(-)
diff --git a/src/plugins/printsupport/cups/qcupsprintengine.cpp b/src/plugins/printsupport/cups/qcupsprintengine.cpp
index 1f9cbc4565..522cfc81b6 100644
--- a/src/plugins/printsupport/cups/qcupsprintengine.cpp
+++ b/src/plugins/printsupport/cups/qcupsprintengine.cpp
@@ -48,6 +48,7 @@
#include <qbuffer.h>
#include "private/qcups_p.h" // Only needed for PPK_CupsOptions
#include <QtGui/qpagelayout.h>
+#include "qcupsprintersupport_p.h"
#include <cups/cups.h>
@@ -254,8 +255,40 @@ void QCupsPrintEnginePrivate::closePrintDevice()
const auto parts = printerName.splitRef(QLatin1Char('/'));
const auto printerOriginalName = parts.at(0);
cups_option_t* optPtr = cupsOptStruct.size() ? &cupsOptStruct.first() : 0;
- cupsPrintFile(printerOriginalName.toLocal8Bit().constData(), tempFile.toLocal8Bit().constData(),
+
+ bool fallbackToLocal = false;
+ cups_dest_t *cupsDest = NULL;
+
+ if (!qEnvironmentVariableIsSet("QT_ENABLE_PRINTER_DISCOVERY")) {
+ fallbackToLocal = true;
+ } else {
+ cupsDest = cupsGetDest(printerOriginalName.toLocal8Bit(), NULL, QCupsPrinterSupport::cupsPrintersCount(), QCupsPrinterSupport::cupsPrinters());
+ }
+
+ if (cupsDest) {
+ char resource[HTTP_MAX_URI];
+ http_t *http = cupsConnectDest (cupsDest, 0, -1, 0,
+ resource, sizeof (resource),
+ 0, 0);
+ if (http) {
+ char *name = strrchr (resource, '/');
+ qDebug() << "resource:" << resource << "," << name;
+ if (name)
+ cupsPrintFile2 (http, ++name, tempFile.toLocal8Bit().constData(),
title.toLocal8Bit().constData(), cupsOptStruct.size(), optPtr);
+ httpClose(http);
+ } else {
+ fallbackToLocal=true;
+ }
+ }
+ else {
+ fallbackToLocal=true;
+ }
+
+ if (fallbackToLocal) {
+ cupsPrintFile(printerOriginalName.toLocal8Bit().constData(), tempFile.toLocal8Bit().constData(),
+ title.toLocal8Bit().constData(), cupsOptStruct.size(), optPtr);
+ }
QFile::remove(tempFile);
}
diff --git a/src/plugins/printsupport/cups/qcupsprintersupport.cpp b/src/plugins/printsupport/cups/qcupsprintersupport.cpp
index 42a7a821f2..3fbfcd2425 100644
--- a/src/plugins/printsupport/cups/qcupsprintersupport.cpp
+++ b/src/plugins/printsupport/cups/qcupsprintersupport.cpp
@@ -61,6 +61,35 @@
# include <cups/language.h>
#endif
+typedef struct
+{
+ cups_dest_t *printers;
+ int num_printers;
+} EnumDestsContext;
+
+static int enum_dest_cb2 (void *user_data, unsigned flags, cups_dest_t *dest)
+{
+ EnumDestsContext *context = (EnumDestsContext *) user_data;
+ if ((flags & (CUPS_DEST_FLAGS_UNCONNECTED |
+ CUPS_DEST_FLAGS_REMOVED |
+ CUPS_DEST_FLAGS_ERROR |
+ CUPS_DEST_FLAGS_RESOLVING |
+ CUPS_DEST_FLAGS_CONNECTING |
+ CUPS_DEST_FLAGS_CANCELED)) == 0) {
+
+ context->num_printers = cupsCopyDest (dest, context->num_printers,
+ &context->printers);
+
+ // Also copy whether this is the local default /
+ cups_dest_t *the_dest;
+ the_dest = cupsGetDest(dest->name, dest->instance,
+ context->num_printers, context->printers);
+ the_dest->is_default = dest->is_default;
+ qDebug() << dest->name << "_" << dest->instance << "_" << context->num_printers;
+ }
+ return 1;
+}
+
QT_BEGIN_NAMESPACE
#if QT_CONFIG(dialogbuttonbox)
@@ -159,17 +188,35 @@ QPrintDevice QCupsPrinterSupport::createPrintDevice(const QString &id)
QStringList QCupsPrinterSupport::availablePrintDeviceIds() const
{
- QStringList list;
+/* // Reset cache disabled for now
+ if (qt_cups_printers) {
+ cupsFreeDests( qt_cups_num_printers, qt_cups_printers );
+ qt_cups_printers = NULL;
+ qt_cups_num_printers = 0;
+ }
+*/
cups_dest_t *dests;
- int count = cupsGetDests(&dests);
- list.reserve(count);
- for (int i = 0; i < count; ++i) {
+ bool enablePrinterDiscovery = qEnvironmentVariableIsSet("QT_ENABLE_PRINTER_DISCOVERY");
+ if (!enablePrinterDiscovery) {
+ qt_cups_num_printers = cupsGetDests(&dests);
+ } else {
+ if (qt_cups_num_printers == 0)
+ QCupsPrinterSupport::fillCupsPrinters();
+
+ dests = qt_cups_printers;
+ }
+ QStringList list;
+ list.reserve(qt_cups_num_printers);
+ for (int i = 0; i < qt_cups_num_printers; ++i) {
QString printerId = QString::fromLocal8Bit(dests[i].name);
if (dests[i].instance)
printerId += QLatin1Char('/') + QString::fromLocal8Bit(dests[i].instance);
list.append(printerId);
}
- cupsFreeDests(count, dests);
+ if (!enablePrinterDiscovery) {
+ cupsFreeDests(qt_cups_num_printers, dests);
+ }
+
return list;
}
@@ -182,8 +229,18 @@ QString QCupsPrinterSupport::staticDefaultPrintDeviceId()
{
QString printerId;
cups_dest_t *dests;
- int count = cupsGetDests(&dests);
- for (int i = 0; i < count; ++i) {
+
+ bool enablePrinterDiscovery = qEnvironmentVariableIsSet("QT_ENABLE_PRINTER_DISCOVERY");
+ if (!enablePrinterDiscovery) {
+ qt_cups_num_printers = cupsGetDests(&dests);
+ } else {
+ if (qt_cups_num_printers == 0)
+ QCupsPrinterSupport::fillCupsPrinters();
+
+ dests = qt_cups_printers;
+ }
+
+ for (int i = 0; i < qt_cups_num_printers; ++i) {
if (dests[i].is_default) {
printerId = QString::fromLocal8Bit(dests[i].name);
if (dests[i].instance) {
@@ -192,8 +249,30 @@ QString QCupsPrinterSupport::staticDefaultPrintDeviceId()
}
}
}
- cupsFreeDests(count, dests);
+ if (!enablePrinterDiscovery) {
+ cupsFreeDests(qt_cups_num_printers, dests);
+ }
return printerId;
}
+void QCupsPrinterSupport::fillCupsPrinters()
+{
+ EnumDestsContext context;
+ context.printers = 0;
+ context.num_printers = 0;
+
+ qDebug() << "begin enumerating printers";
+
+ cupsEnumDests(CUPS_DEST_FLAGS_NONE, 4000, NULL, 0, 0,
+ enum_dest_cb2, &context);
+
+ qDebug() << "end enumerating printers";
+ qt_cups_printers = context.printers;
+ qt_cups_num_printers = context.num_printers;
+}
+
+cups_dest_t *QCupsPrinterSupport::qt_cups_printers = NULL;
+int QCupsPrinterSupport::qt_cups_num_printers = 0;
+
+
QT_END_NAMESPACE
diff --git a/src/plugins/printsupport/cups/qcupsprintersupport_p.h b/src/plugins/printsupport/cups/qcupsprintersupport_p.h
index c2b4895c7f..9531a0c368 100644
--- a/src/plugins/printsupport/cups/qcupsprintersupport_p.h
+++ b/src/plugins/printsupport/cups/qcupsprintersupport_p.h
@@ -56,6 +56,8 @@
#include <QtCore/qstringlist.h>
+#include <cups/cups.h>
+
QT_BEGIN_NAMESPACE
class QCupsPrinterSupport : public QPlatformPrinterSupport
@@ -73,8 +75,14 @@ public:
static QString staticDefaultPrintDeviceId();
+ static void fillCupsPrinters();
+ static cups_dest_t *cupsPrinters() { return qt_cups_printers; };
+ static int cupsPrintersCount() { return qt_cups_num_printers; };
private:
QString cupsOption(int i, const QString &key) const;
+
+ static cups_dest_t *qt_cups_printers;
+ static int qt_cups_num_printers;
};
QT_END_NAMESPACE
diff --git a/src/plugins/printsupport/cups/qppdprintdevice.cpp b/src/plugins/printsupport/cups/qppdprintdevice.cpp
index 8bfa239dbe..b38a2081bc 100644
--- a/src/plugins/printsupport/cups/qppdprintdevice.cpp
+++ b/src/plugins/printsupport/cups/qppdprintdevice.cpp
@@ -65,10 +65,36 @@ QPpdPrintDevice::QPpdPrintDevice(const QString &id)
if (parts.size() > 1)
m_cupsInstance = parts.at(1).toUtf8();
+ bool enablePrinterDiscovery = qEnvironmentVariableIsSet("QT_ENABLE_PRINTER_DISCOVERY");
+
// Get the print instance and PPD file
- m_cupsDest = cupsGetNamedDest(CUPS_HTTP_DEFAULT, m_cupsName, m_cupsInstance.isNull() ? nullptr : m_cupsInstance.constData());
+ if (!enablePrinterDiscovery) {
+ m_cupsDest = cupsGetNamedDest(CUPS_HTTP_DEFAULT, m_cupsName, m_cupsInstance.isNull() ? nullptr : m_cupsInstance.constData());
+ } else {
+ cups_dest_t *cupsDest = cupsGetDest( m_cupsName,
+ (m_cupsInstance.isEmpty() ? nullptr : m_cupsInstance.data()),
+ QCupsPrinterSupport::cupsPrintersCount(),
+ QCupsPrinterSupport::cupsPrinters() );
+ cupsCopyDest(cupsDest, 0, &m_cupsDest);
+ }
if (m_cupsDest) {
- const char *ppdFile = cupsGetPPD(m_cupsName);
+ char resource[HTTP_MAX_URI];
+ http_t *http = NULL;
+ const char *ppdFile = NULL;
+
+ if (enablePrinterDiscovery) {
+ http = cupsConnectDest (m_cupsDest, 0, -1, 0,
+ resource, sizeof (resource),
+ 0, 0);
+ }
+ if (http) {
+ char *name = strrchr (resource, '/');
+ if (name)
+ ppdFile = cupsGetPPD2 (http, ++name);
+ httpClose(http);
+ } else {
+ ppdFile = cupsGetPPD(m_cupsName);
+ }
if (ppdFile) {
m_ppd = ppdOpenFile(ppdFile);
unlink(ppdFile);
--
2.36.1
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