1109f115bd
Directive .align is arch-dependent, .balign is not. Change-Id: Ibf2097da29f743f2c87c79d2a88ce1abd0aa6227
87 lines
3.6 KiB
ArmAsm
87 lines
3.6 KiB
ArmAsm
/*
|
|
* Copyright (C) 2013 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
.text
|
|
.balign 0
|
|
|
|
.global scanline_col32cb16blend_arm64
|
|
|
|
//
|
|
// This function alpha blends a fixed color into a destination scanline, using
|
|
// the formula:
|
|
//
|
|
// d = s + (((a + (a >> 7)) * d) >> 8)
|
|
//
|
|
// where d is the destination pixel,
|
|
// s is the source color,
|
|
// a is the alpha channel of the source color.
|
|
//
|
|
|
|
// x0 = destination buffer pointer
|
|
// w1 = color value
|
|
// w2 = count
|
|
|
|
|
|
scanline_col32cb16blend_arm64:
|
|
|
|
lsr w5, w1, #24 // shift down alpha
|
|
mov w9, #0xff // create mask
|
|
add w5, w5, w5, lsr #7 // add in top bit
|
|
mov w4, #256 // create #0x100
|
|
sub w5, w4, w5 // invert alpha
|
|
and w10, w1, #0xff // extract red
|
|
and w12, w9, w1, lsr #8 // extract green
|
|
and w4, w9, w1, lsr #16 // extract blue
|
|
lsl w10, w10, #5 // prescale red
|
|
lsl w12, w12, #6 // prescale green
|
|
lsl w4, w4, #5 // prescale blue
|
|
lsr w9, w9, #2 // create dest green mask
|
|
|
|
1:
|
|
ldrh w8, [x0] // load dest pixel
|
|
subs w2, w2, #1 // decrement loop counter
|
|
lsr w6, w8, #11 // extract dest red
|
|
and w7, w9, w8, lsr #5 // extract dest green
|
|
and w8, w8, #0x1f // extract dest blue
|
|
|
|
madd w6, w6, w5, w10 // dest red * alpha + src red
|
|
madd w7, w7, w5, w12 // dest green * alpha + src green
|
|
madd w8, w8, w5, w4 // dest blue * alpha + src blue
|
|
|
|
lsr w6, w6, #8 // shift down red
|
|
lsr w7, w7, #8 // shift down green
|
|
lsl w6, w6, #11 // shift red into 565
|
|
orr w6, w6, w7, lsl #5 // shift green into 565
|
|
orr w6, w6, w8, lsr #8 // shift blue into 565
|
|
|
|
strh w6, [x0], #2 // store pixel to dest, update ptr
|
|
b.ne 1b // if count != 0, loop
|
|
|
|
ret
|
|
|
|
|
|
|