QOpenGLTextureBlitter

private api, but useful for 2d gui code that suddenly finds itself
needing to get a set of textures onto some fbo

I didn't want to include ARB_copy_image since it looks like its from
texture/renderbuffer -> texture/renderbuffer while this class implies
texture -> write fbo. We could wrap ARB_copy_image in QOpenGLTexture or
some other class or we can add it later.

I have not added any QOpenGLTexture functions since this class opperates
on the GLuint identifier. We can add overloads later.

Change-Id: I3e565b33466c1c183a249a33c3e82c6786debd55
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
WinRT: Fix use of std::thread in QThread

Don't delete the thread object without detaching it, use detach()
instead of CloseHandle(), and avoid a double-delete.

Change-Id: Ia169a96fb32805e06abe099c3c35e97ce485f088
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Export optimized premultiply and unpremultiply methods

This patch optimizes the unpremultiply method further by using a
lookup table to avoid any divisions at all.

The opportunity is taken to export both premultiply and unpremultiply
since they are commonly used methods relevant to the exported QRgb type
that can be both premultiplied and unpremultipled ARGB.

[ChangeLog][QtGui][QColor] Exported highly optimized methods for
premultiply and unpremultiply of QRgb values.

Change-Id: I658bcf57b0bc73c34c1765b64617d43b63ae820b
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>
Cocoa: Neuter -[QNSView cancelOperation:] for normal windows

QNSWindow inherits QNSPanel regardless of the kind of QWindow. With
NSPanels, pressing escape is equivalent to dismissing the panel.
That is not the behavior we aim at for normal toplevel QWindows.

Task-number: QTBUG-36694
Change-Id: I1a1c138183cc43c968249442021f334cd37f7ce0
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Cocoa: Add setNSToolbar(QWindow *, NSToolBar *)

Calling this function associates the given native
toolbar with the QWindow. QWindow will then set
it on the native NSWindow at the appropriate time
during window creation.

Change-Id: I2a50f79b2a0453cc739f8d68e965e37b95998083
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>