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/*
** Copyright 2015, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#ifdef DEBUG
#define DBG
#else
#define DBG #
#endif
/*
* blend one of 2 16bpp RGB pixels held in dreg selected by shift
* with the 32bpp ABGR pixel held in src and store the result in fb
*
* Assumes that the dreg data is little endian and that
* the the second pixel (shift==16) will be merged into
* the fb result
*
* Uses $a4,$t2,$t3,$t8
*/
.macro pixel dreg src fb shift
/*
* sA = s >> 24
* f = 0x100 - (sA + (sA>>7))
*/
srl $t3,\src,24
srl $t2,$t3,7
addu $t3,$t2
li $t2,0x100
subu $t3,$t2,$t3
/* red */
ext $t8,\dreg,\shift+6+5,5 # dst[\shift:15..11]
mul $t2,$t8,$t3
ext $a4,\dreg,\shift+5,6 # start green extraction dst[\shift:10..5]
ext $t8,\src,3,5 # src[7..3]
srl $t2,8
addu $t8,$t2
.if \shift!=0
sll $t8,\shift+11 # dst[\shift:15..11]
or \fb,$t8
.else
sll \fb,$t8,11
.endif
/* green */
mul $t8,$a4,$t3
ext $a4,\dreg,\shift,5 # start blue extraction dst[\shift:4..0]
ext $t2,\src,2+8,6 # src[15..10]
srl $t8,8
addu $t8,$t2
/* blue */
mul $a4,$a4,$t3
sll $t8, $t8, \shift+5 # finish green insertion dst[\shift:10..5]
or \fb, \fb, $t8
ext $t2,\src,(3+8+8),5
srl $t8,$a4,8
addu $t8,$t2
sll $t8, $t8, \shift
or \fb, \fb, $t8
.endm
.text
.balign 4
.global scanline_t32cb16blend_mips64
.ent scanline_t32cb16blend_mips64
scanline_t32cb16blend_mips64:
daddiu $sp, $sp, -40
DBG li $v0,0xffffffff
DBG li $v1,0
/* Align the destination if necessary */
and $a4,$a0,3
beqz $a4,aligned
/* as long as there is at least one pixel */
beqz $a2,done
lw $t0,($a1)
daddu $a0,2
daddu $a1,4
beqz $t0,1f
lhu $a7,-2($a0)
pixel $a7,$t0,$a5,0
sh $a5,-2($a0)
1: subu $a2,1
aligned:
/* Check to see if its worth unrolling the loop */
subu $a2,4
bltz $a2,tail
/* Process 4 pixels at a time */
fourpixels:
/* 1st pair of pixels */
lw $t0,0($a1)
lw $t1,4($a1)
daddu $a0,8
daddu $a1,16
/* both are zero, skip this pair */
or $a7,$t0,$t1
beqz $a7,1f
/* load the destination */
lw $a7,-8($a0)
pixel $a7,$t0,$a5,0
andi $a5, 0xFFFF
pixel $a7,$t1,$a5,16
sw $a5,-8($a0)
1:
/* 2nd pair of pixels */
lw $t0,-8($a1)
lw $t1,-4($a1)
/* both are zero, skip this pair */
or $a7,$t0,$t1
beqz $a7,1f
/* load the destination */
lw $a7,-4($a0)
pixel $a7,$t0,$a5,0
andi $a5, 0xFFFF
pixel $a7,$t1,$a5,16
sw $a5,-4($a0)
1: subu $a2,4
bgtz $a2,fourpixels
tail:
/* the pixel count underran, restore it now */
addu $a2,4
/* handle the last 0..3 pixels */
beqz $a2,done
onepixel:
lw $t0,($a1)
daddu $a0,2
daddu $a1,4
beqz $t0,1f
lhu $a7,-2($a0)
pixel $a7,$t0,$a5,0
sh $a5,-2($a0)
1: subu $a2,1
bnez $a2,onepixel
done:
DBG .set push
DBG .set mips32r2
DBG rdhwr $a0,$3
DBG mul $v0,$a0
DBG mul $v1,$a0
DBG .set pop
daddiu $sp, $sp, 40
j $ra
.end scanline_t32cb16blend_mips64
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