QMacPrintEngine: Really set the printer resolution

As already reported in 2009 (Qt 4.6) QPrinter never actually set the
printer resolution. This change adds the necessary call to
PMPrinterSetOutputResolution (available since OS X 10.5).

[ChangeLog][QtPrintSupport][OS X] QMacPrintEngine now really sets the
printer resolution.

Task-number: QTBUG-7000
Change-Id: I3e851b62e1a7ed78564a8a6fd576b0a18d7eff63
Reviewed-by: Andy Shaw <andy.shaw@theqtcompany.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/tests/auto/printsupport/kernel/qprinter/tst_qprinter.cpp b/tests/auto/printsupport/kernel/qprinter/tst_qprinter.cpp
index aa72be3ea8..5e7a40d3b5 100644
--- a/tests/auto/printsupport/kernel/qprinter/tst_qprinter.cpp
+++ b/tests/auto/printsupport/kernel/qprinter/tst_qprinter.cpp
@@ -1628,7 +1628,24 @@ void tst_QPrinter::resolution()
         // Test set/get
         int expected = 333;
 #ifdef Q_OS_MAC
-        // Set resolution does nothing on OSX, see QTBUG-7000
+        // QMacPrintEngine chooses the closest supported resolution.
+        const QList<int> all_supported = native.supportedResolutions();
+        foreach (int supported, all_supported) {
+            // Test setting a supported resolution
+            int requested = supported;
+            native.setResolution(requested);
+            QCOMPARE(native.resolution(), requested);
+
+            // Test setting an unsupported resolution
+            do {
+                requested += 5;
+            } while (all_supported.contains(requested));
+            native.setResolution(requested);
+            int result = native.resolution();
+            QVERIFY(all_supported.contains(result));
+            QVERIFY(qAbs(result - requested) <= qAbs(supported - requested));
+        }
+
         expected = native.resolution();
 #endif // Q_OS_MAC
         native.setResolution(expected);