Optimized scaled/transformed image blending for ARGB32PM and RGB16 on RGB16.

Before:
:/traces/qmlphoneconcept.trace, iterations: 5, frames: 48, min(ms):
1207, median(ms): 1212, stddev: 0,165153 %, max(fps): 39,768020

After:
traces/qmlphoneconcept.trace, iterations: 3, frames: 48, min(ms): 884,
median(ms): 886, stddev: 0,383097 %, max(fps): 54,298643

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

1 files changed, 192 insertions, 0 deletions

diff --git a/src/gui/painting/qdrawhelper_neon_asm.S b/src/gui/painting/qdrawhelper_neon_asm.S
new file mode 100644
index 0000000..9992817
--- /dev/null
+++ b/src/gui/painting/qdrawhelper_neon_asm.S
@@ -0,0 +1,192 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/* Prevent the stack from becoming executable for no reason... */
+#if defined(__linux__) && defined(__ELF__)
+.section .note.GNU-stack,"",%progbits
+#endif
+
+.text
+.fpu neon
+.arch armv7a
+.altmacro
+
+/* void blend_8_pixels_argb32_on_rgb16_neon(quint16 *dst, const quint32 *src, int const_alpha) */
+
+    .func blend_8_pixels_argb32_on_rgb16_neon
+    .global blend_8_pixels_argb32_on_rgb16_neon
+    /* For ELF format also set function visibility to hidden */
+#ifdef __ELF__
+    .hidden blend_8_pixels_argb32_on_rgb16_neon
+    .type blend_8_pixels_argb32_on_rgb16_neon, %function
+#endif
+blend_8_pixels_argb32_on_rgb16_neon:
+    vld4.8      { d0, d1, d2, d3 }, [r1]
+    vld1.16     { d4, d5 }, [r0]
+
+    cmp         r2, #256
+    beq         .blend_32_inner
+
+    vdup.8      d6, r2
+
+    /* multiply by const_alpha */
+    vmull.u8    q8,   d6, d0
+    vmull.u8    q9,   d6, d1
+    vmull.u8    q10,  d6, d2
+    vmull.u8    q11,  d6, d3
+
+    vshrn.u16   d0,  q8, #8
+    vshrn.u16   d1,  q9, #8
+    vshrn.u16   d2, q10, #8
+    vshrn.u16   d3, q11, #8
+
+.blend_32_inner:
+    /* convert 8 r5g6b5 pixel data from {d4, d5} to planar 8-bit format
+       and put data into d6 - red, d7 - green, d30 - blue */
+    vshrn.u16   d6, q2, #8
+    vshrn.u16   d7, q2, #3
+    vsli.u16    q2, q2, #5
+    vsri.u8     d6, d6, #5
+    vmvn.8      d3, d3
+    vsri.u8     d7, d7, #6
+    vshrn.u16   d30, q2, #2
+
+    pld [r0, #128]
+
+    /* now do alpha blending, storing results in 8-bit planar format
+       into d16 - red, d19 - green, d18 - blue */
+    vmull.u8    q10, d3, d6
+    vmull.u8    q11, d3, d7
+    vmull.u8    q12, d3, d30
+    vrshr.u16   q13, q10, #8
+    vrshr.u16   q3,  q11, #8
+    vrshr.u16   q15, q12, #8
+    vraddhn.u16 d20, q10, q13
+    vraddhn.u16 d23, q11, q3
+    vraddhn.u16 d22, q12, q15
+    vqadd.u8    d16, d2, d20
+    vqadd.u8    q9, q0, q11
+    /* convert the result to r5g6b5 and store it into {d28, d29} */
+    vshll.u8    q14, d16, #8
+    vshll.u8    q8, d19, #8
+    vshll.u8    q9, d18, #8
+    vsri.u16    q14, q8, #5
+    vsri.u16    q14, q9, #11
+
+    vst1.16     { d28, d29 }, [r0]
+
+    bx          lr
+
+    .endfunc
+
+/* void blend_8_pixels_rgb16_on_rgb16_neon(quint16 *dst, const quint16 *src, int const_alpha) */
+
+    .func blend_8_pixels_rgb16_on_rgb16_neon
+    .global blend_8_pixels_rgb16_on_rgb16_neon
+    /* For ELF format also set function visibility to hidden */
+#ifdef __ELF__
+    .hidden blend_8_pixels_rgb16_on_rgb16_neon
+    .type blend_8_pixels_rgb16_on_rgb16_neon, %function
+#endif
+blend_8_pixels_rgb16_on_rgb16_neon:
+    vld1.16     { d0, d1 }, [r0]
+    vld1.16     { d2, d3 }, [r1]
+
+    rsb         r3, r2, #256
+    vdup.8      d4, r2
+    vdup.8      d5, r3
+
+    /* convert 8 r5g6b5 pixel data from {d0, d1} to planar 8-bit format
+       and put data into d6 - red, d7 - green, d30 - blue */
+    vshrn.u16   d6,  q0,  #8
+    vshrn.u16   d7,  q0,  #3
+    vsli.u16    q0,  q0,  #5
+    vsri.u8     d6,  d6,  #5
+    vsri.u8     d7,  d7,  #6
+    vshrn.u16   d30, q0,  #2
+
+    /* same from {d2, d3} into {d26, d27, d28} */
+    vshrn.u16   d26, q1,  #8
+    vshrn.u16   d27, q1,  #3
+    vsli.u16    q1,  q1,  #5
+    vsri.u8     d26, d26, #5
+    vsri.u8     d27, d27, #6
+    vshrn.u16   d28, q1,  #2
+
+    /* multiply dst by inv const_alpha */
+    vmull.u8    q10, d5,  d6
+    vmull.u8    q11, d5,  d7
+    vmull.u8    q12, d5,  d30
+
+    vshrn.u16   d6,  q10, #8
+    vshrn.u16   d7,  q11, #8
+    vshrn.u16   d30, q12, #8
+
+    /* multiply src by const_alpha */
+    vmull.u8    q10,  d4, d26
+    vmull.u8    q11,  d4, d27
+    vmull.u8    q12,  d4, d28
+
+    vshrn.u16   d26, q10, #8
+    vshrn.u16   d27, q11, #8
+    vshrn.u16   d28, q12, #8
+
+    /* preload dst + 128 */
+    pld [r0, #128]
+
+    /* add components, storing results in 8-bit planar format
+       into d16 - red, d19 - green, d18 - blue */
+    vadd.u8     d16, d26, d6
+    vadd.u8     d19, d27, d7
+    vadd.u8     d18, d28, d30
+
+    /* convert the result to r5g6b5 and store it into {d28, d29} */
+    vshll.u8    q14, d16, #8
+    vshll.u8    q8,  d19, #8
+    vshll.u8    q9,  d18, #8
+    vsri.u16    q14,  q8, #5
+    vsri.u16    q14,  q9, #11
+
+    vst1.16     { d28, d29 }, [r0]
+
+    bx          lr
+
+    .endfunc