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/* libs/pixelflinger/t32cb16blend.S
**
** Copyright 2010, 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 $t0,$t6,$t7,$t8
*/
#if __mips==32 && __mips_isa_rev>=2
.macro pixel dreg src fb shift
/*
* sA = s >> 24
* f = 0x100 - (sA + (sA>>7))
*/
DBG .set noat
DBG rdhwr $at,$2
DBG .set at
srl $t7,\src,24
srl $t6,$t7,7
addu $t7,$t6
li $t6,0x100
subu $t7,$t6,$t7
/* red */
ext $t8,\dreg,\shift+6+5,5 # dst[\shift:15..11]
mul $t6,$t8,$t7
ext $t0,\dreg,\shift+5,6 # start green extraction dst[\shift:10..5]
ext $t8,\src,3,5 # src[7..3]
srl $t6,8
addu $t8,$t6
.if \shift!=0
sll $t8,\shift+11
or \fb,$t8
.else
sll \fb,$t8,11
.endif
/* green */
mul $t8,$t0,$t7
ext $t0,\dreg,\shift,5 # start blue extraction dst[\shift:4..0]
ext $t6,\src,2+8,6 # src[15..10]
srl $t8,8
addu $t8,$t6
/* blue */
mul $t0,$t0,$t7
sll $t8, $t8, \shift+5
or \fb, \fb, $t8
ext $t6,\src,(3+8+8),5
srl $t8,$t0,8
addu $t8,$t6
sll $t8, $t8, \shift
or \fb, \fb, $t8
DBG .set noat
DBG rdhwr $t8,$2
DBG subu $t8,$at
DBG sltu $at,$t8,$v0
DBG movn $v0,$t8,$at
DBG sgtu $at,$t8,$v1
DBG movn $v1,$t8,$at
DBG .set at
.endm
#else
.macro pixel dreg src fb shift
/*
* sA = s >> 24
* f = 0x100 - (sA + (sA>>7))
*/
DBG .set push
DBG .set noat
DBG .set mips32r2
DBG rdhwr $at,$2
DBG .set pop
srl $t7,\src,24
srl $t6,$t7,7
addu $t7,$t6
li $t6,0x100
subu $t7,$t6,$t7
/*
* red
* dR = (d >> (6 + 5)) & 0x1f;
* dR = (f*dR)>>8
* sR = (s >> ( 3)) & 0x1f;
* sR += dR
* fb |= sR << 11
*/
srl $t8,\dreg,\shift+6+5
.if \shift==0
and $t8,0x1f
.endif
mul $t8,$t8,$t7
srl $t6,\src,3
and $t6,0x1f
srl $t8,8
addu $t8,$t6
.if \shift!=0
sll $t8,\shift+11
or \fb,$t8
.else
sll \fb,$t8,11
.endif
/*
* green
* dG = (d >> 5) & 0x3f
* dG = (f*dG) >> 8
* sG = (s >> ( 8+2))&0x3F;
*/
srl $t8,\dreg,\shift+5
and $t8,0x3f
mul $t8,$t8,$t7
srl $t6,\src,8+2
and $t6,0x3f
srl $t8,8
addu $t8,$t6
sll $t8,\shift + 5
or \fb,$t8
/* blue */
.if \shift!=0
srl $t8,\dreg,\shift
and $t8,0x1f
.else
and $t8,\dreg,0x1f
.endif
mul $t8,$t8,$t7
srl $t6,\src,(8+8+3)
and $t6,0x1f
srl $t8,8
addu $t8,$t6
.if \shift!=0
sll $t8,\shift
.endif
or \fb,$t8
DBG .set push
DBG .set noat
DBG .set mips32r2
DBG rdhwr $t8,$2
DBG subu $t8,$at
DBG sltu $at,$t8,$v0
DBG movn $v0,$t8,$at
DBG sgtu $at,$t8,$v1
DBG movn $v1,$t8,$at
DBG .set pop
.endm
#endif
.text
.balign 4
.global scanline_t32cb16blend_mips
.ent scanline_t32cb16blend_mips
scanline_t32cb16blend_mips:
DBG li $v0,0xffffffff
DBG li $v1,0
/* Align the destination if necessary */
and $t0,$a0,3
beqz $t0,aligned
/* as long as there is at least one pixel */
beqz $a2,done
lw $t4,($a1)
addu $a0,2
addu $a1,4
beqz $t4,1f
lhu $t3,-2($a0)
pixel $t3,$t4,$t1,0
sh $t1,-2($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 $t4,0($a1)
lw $t5,4($a1)
addu $a0,8
addu $a1,16
/* both are zero, skip this pair */
or $t3,$t4,$t5
beqz $t3,1f
/* load the destination */
lw $t3,-8($a0)
pixel $t3,$t4,$t1,0
andi $t1, 0xFFFF
pixel $t3,$t5,$t1,16
sw $t1,-8($a0)
1:
/* 2nd pair of pixels */
lw $t4,-8($a1)
lw $t5,-4($a1)
/* both are zero, skip this pair */
or $t3,$t4,$t5
beqz $t3,1f
/* load the destination */
lw $t3,-4($a0)
pixel $t3,$t4,$t1,0
andi $t1, 0xFFFF
pixel $t3,$t5,$t1,16
sw $t1,-4($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 $t4,($a1)
addu $a0,2
addu $a1,4
beqz $t4,1f
lhu $t3,-2($a0)
pixel $t3,$t4,$t1,0
sh $t1,-2($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
j $ra
.end scanline_t32cb16blend_mips
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