Fix Clang 3.3 warning on using an undefined inline function

Clang doesn't like forward-declared inline functions.

 qmetatype.h:70:29: error: inline function
      'qMetaTypeId<QtMetaTypePrivate::QPairVariantInterfaceImpl>' is not defined [-Werror,-Wundefined-inline]
 inline Q_DECL_CONSTEXPR int qMetaTypeId();
                            ^
 qmetatype.h:1463:30: note: used here
            const int toId = qMetaTypeId<QtMetaTypePrivate::QPairVariantInterfaceImpl>();
                             ^

Change-Id: I1454af5cce56512f0b3d63cfaf51a536207fc511
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Compile fix in qxcbwindow

There was a error: narrowing conversion of 'Myns::XEMBED_VERSION'
from 'unsigned int' to 'long int' inside { } [-Werror=narrowing]

Change-Id: I1e155870b0b632bfe5ffa9deac69c4f151f5aa23
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Make tst_qalgorithms compliant with the Standard

§24.4.1 [iterator.traits] of N3337 makes it *mandatory* to define the
various types

    std::iterator_traits<Iterator>::{value,pointer,...}

for any given iterator.

§24.4.1.2 makes it enough to define them within our iterator class.

Change-Id: I1305c8392d224889b09395e30ecc77b194020a15
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
qpluginloader: fix static build (on iOS)

Since the function locatePlugin is unused when
building Qt statically, the build fails on
iOS. This patch will ensure that we only define it
for shared builds.

Change-Id: Idf3c3246d3cac94a3c001cc261f326e9a396aa31
Reviewed-by: David Faure <david.faure@kdab.com>
qimagereader: fix build on iOS

Change-Id: Ia928e449ecec49988e0af69da0a7aded5bf36871
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
Rely solely on alphaMapBoundingBox in QTextureGlyphCache

We're currently adding a lot of transparent pixels to the cache,
wasting both memory and cpu cycles while drawing. AlphaMapBoundingBox
was introduced to return the exact same bounds as the alphaMapForGlyph
function so we should only rely on this instead of adding arbitrary
padding and margins all over the place.

Windows still has an arbitrary +4 in the its drawGDIGlyph() which
means batching will not work on windows, but at least now
other platforms do not need to suffer.

Change-Id: I714903fa195004400c09c3bf6570e46179775f09
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Remove undesired pixel padding of glyphs on windows.

The excessive padding has serious performance implications throughout
Qt and need to go. The original reason for having them was to fix
issues with GL text rendering and issues with unspecified OpenType
fonts. There have been several other changes to the glyph cache
since then and neither of the issues can be reproduced today.

Change-Id: I6de67598a079c296daf48be07cc5c2d67768c384
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>