Add private API for conversion from QVideoFrame to QImage.

The Android plugin had a function to convert from NV21 to RGB32.
It's now moved to the Qt Multimedia library and it supports additional
source formats. It could be further improved with more SIMD code, it
could then become a public API.

Change-Id: Ibee349027048a263a1a7ea74dc51237f7747912c
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/src/multimedia/video/qvideoframeconversionhelper_sse2.cpp b/src/multimedia/video/qvideoframeconversionhelper_sse2.cpp
new file mode 100644
index 000000000..27689e5bb
--- /dev/null
+++ b/src/multimedia/video/qvideoframeconversionhelper_sse2.cpp
@@ -0,0 +1,83 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qvideoframeconversionhelper_p.h"
+
+#ifdef QT_COMPILER_SUPPORTS_SSE2
+
+QT_BEGIN_NAMESPACE
+
+void QT_FASTCALL qt_convert_BGRA32_to_ARGB32_sse2(const QVideoFrame &frame, uchar *output)
+{
+    FETCH_INFO_PACKED(frame)
+    MERGE_LOOPS(width, height, stride, 4)
+    quint32 *argb = reinterpret_cast<quint32*>(output);
+
+    const __m128i zero = _mm_setzero_si128();
+
+    for (int y = 0; y < height; ++y) {
+        const quint32 *bgra = reinterpret_cast<const quint32*>(src);
+
+        int x = 0;
+        ALIGN(16, argb, x, width) {
+            *argb = qConvertBGRA32ToARGB32(*bgra);
+            ++bgra;
+            ++argb;
+        }
+
+        for (; x < width - 3; x += 4) {
+            __m128i pixelData = _mm_loadu_si128(reinterpret_cast<const __m128i*>(bgra));
+            bgra += 4;
+            __m128i gaComponents = _mm_unpacklo_epi8(pixelData, zero);
+            __m128i brComponents = _mm_unpackhi_epi8(pixelData, zero);
+            gaComponents = _mm_shufflelo_epi16(_mm_shufflehi_epi16(gaComponents, _MM_SHUFFLE(0, 1, 2, 3)), _MM_SHUFFLE(0, 1, 2, 3)); // swap GA
+            brComponents = _mm_shufflelo_epi16(_mm_shufflehi_epi16(brComponents, _MM_SHUFFLE(0, 1, 2, 3)), _MM_SHUFFLE(0, 1, 2, 3)); // swap BR
+            pixelData = _mm_packus_epi16(gaComponents, brComponents);
+            _mm_store_si128(reinterpret_cast<__m128i*>(argb), pixelData);
+            argb += 4;
+        }
+
+        // leftovers
+        for (; x < width; ++x) {
+            *argb = qConvertBGRA32ToARGB32(*bgra);
+            ++bgra;
+            ++argb;
+        }
+
+        src += stride;
+    }
+}
+
+QT_END_NAMESPACE
+
+#endif