Included ARM NEON optimizations from pixman in Qt.

On the N900 16 bit text blending is 30 - 50 % faster, and ARGB32PM
on RGB16 image blending now runs in 1/10th of the time it used to.
We now make ARGB32PM the default pixmap format for alpha pixmaps instead
of ARGB8565PM which is unaligned and bad for performance.

The relevant numbers:

Mostly opaque pixels:
ARGB24 on ARGB24 using QPainter..................: 336,813033
ARGB32 on ARGB32 using QPainter.................: 18,419387

RGB16 on ARGB24 using QPainter..................: 167,301014
RGB16 on ARGB32 using QPainter..................: 17,279372

ARGB24 on RGB16 using QPainter..................: 35,100147
ARGB32PM on RGB16 using QPainter................: 15,924256

No opaque pixels:
ARGB24 on ARGB24 using QPainter..................: 412,190765
ARGB32 on ARGB32 using QPainter.................: 16,818389

RGB16 on ARGB24 using QPainter..................: 170,957878
RGB16 on ARGB32 using QPainter..................: 16,742984

ARGB24 on RGB16 using QPainter..................: 93,600482
ARGB32PM on RGB16 using QPainter................: 15,999310

So switching to ARGB32PM should give a boost in all areas.

Task-number: QTBUG-6684
Reviewed-by: Gunnar Sletta

1 files changed, 39 insertions, 0 deletions

diff --git a/doc/src/legal/3rdparty.qdoc b/doc/src/legal/3rdparty.qdoc
index d608038..8d0cd2a 100644
--- a/doc/src/legal/3rdparty.qdoc
+++ b/doc/src/legal/3rdparty.qdoc
@@ -454,4 +454,43 @@
     OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
 
     See \c src/3rdparty/webkit/JavaScriptCore/wtf/dtoa.cpp for license details.
+
+    \section1 Pixman (\c pixman) version 0.17.11
+
+    \e{pixman is a library that provides low-level pixel manipulation
+    features such as image compositing and trapezoid rasterization.} -- quoted
+    from \c src/3rdparty/pixman/README
+
+    We are only using the pixman-arm-neon-asm.h and pixman-arm-neon-asm.S
+    source files which have the following copyright and license header:
+
+    \hr
+
+    Copyright © 2009 Nokia Corporation
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice (including the next
+    paragraph) shall be included in all copies or substantial portions of the
+    Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+
+    Author:  Siarhei Siamashka (siarhei.siamashka@nokia.com)
+
+    \hr
+
+    See \c src/3rdparty/pixman/pixman-arm-neon-asm.h and
+    \c src/3rdparty/pixman/pixman-arm-neon-asm.S
 */