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