1 /* 2 ** Copyright 2015, The Android Open Source Project 3 ** 4 ** Licensed under the Apache License, Version 2.0 (the "License"); 5 ** you may not use this file except in compliance with the License. 6 ** You may obtain a copy of the License at 7 ** 8 ** http://www.apache.org/licenses/LICENSE-2.0 9 ** 10 ** Unless required by applicable law or agreed to in writing, software 11 ** distributed under the License is distributed on an "AS IS" BASIS, 12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 ** See the License for the specific language governing permissions and 14 ** limitations under the License. 15 */ 16 17 #ifdef DEBUG 18 #define DBG 19 #else 20 #define DBG # 21 #endif 22 23 /* 24 * blend one of 2 16bpp RGB pixels held in dreg selected by shift 25 * with the 32bpp ABGR pixel held in src and store the result in fb 26 * 27 * Assumes that the dreg data is little endian and that 28 * the the second pixel (shift==16) will be merged into 29 * the fb result 30 * 31 * Uses $a4,$t2,$t3,$t8 32 */ 33 34 .macro pixel dreg src fb shift 35 /* 36 * sA = s >> 24 37 * f = 0x100 - (sA + (sA>>7)) 38 */ 39 srl $t3,\src,24 40 srl $t2,$t3,7 41 addu $t3,$t2 42 li $t2,0x100 43 subu $t3,$t2,$t3 44 45 /* red */ 46 ext $t8,\dreg,\shift+6+5,5 # dst[\shift:15..11] 47 mul $t2,$t8,$t3 48 ext $a4,\dreg,\shift+5,6 # start green extraction dst[\shift:10..5] 49 ext $t8,\src,3,5 # src[7..3] 50 srl $t2,8 51 addu $t8,$t2 52 .if \shift!=0 53 sll $t8,\shift+11 # dst[\shift:15..11] 54 or \fb,$t8 55 .else 56 sll \fb,$t8,11 57 .endif 58 59 /* green */ 60 mul $t8,$a4,$t3 61 ext $a4,\dreg,\shift,5 # start blue extraction dst[\shift:4..0] 62 ext $t2,\src,2+8,6 # src[15..10] 63 srl $t8,8 64 addu $t8,$t2 65 66 /* blue */ 67 mul $a4,$a4,$t3 68 sll $t8, $t8, \shift+5 # finish green insertion dst[\shift:10..5] 69 or \fb, \fb, $t8 70 ext $t2,\src,(3+8+8),5 71 srl $t8,$a4,8 72 addu $t8,$t2 73 sll $t8, $t8, \shift 74 or \fb, \fb, $t8 75 .endm 76 77 .text 78 .align 79 80 .global scanline_t32cb16blend_mips64 81 .ent scanline_t32cb16blend_mips64 82 scanline_t32cb16blend_mips64: 83 daddiu $sp, $sp, -40 84 DBG li $v0,0xffffffff 85 DBG li $v1,0 86 /* Align the destination if necessary */ 87 and $a4,$a0,3 88 beqz $a4,aligned 89 90 /* as long as there is at least one pixel */ 91 beqz $a2,done 92 93 lw $t0,($a1) 94 daddu $a0,2 95 daddu $a1,4 96 beqz $t0,1f 97 lhu $a7,-2($a0) 98 pixel $a7,$t0,$a5,0 99 sh $a5,-2($a0) 100 1: subu $a2,1 101 102 aligned: 103 /* Check to see if its worth unrolling the loop */ 104 subu $a2,4 105 bltz $a2,tail 106 107 /* Process 4 pixels at a time */ 108 fourpixels: 109 /* 1st pair of pixels */ 110 lw $t0,0($a1) 111 lw $t1,4($a1) 112 daddu $a0,8 113 daddu $a1,16 114 115 /* both are zero, skip this pair */ 116 or $a7,$t0,$t1 117 beqz $a7,1f 118 119 /* load the destination */ 120 lw $a7,-8($a0) 121 122 pixel $a7,$t0,$a5,0 123 andi $a5, 0xFFFF 124 pixel $a7,$t1,$a5,16 125 sw $a5,-8($a0) 126 127 1: 128 /* 2nd pair of pixels */ 129 lw $t0,-8($a1) 130 lw $t1,-4($a1) 131 132 /* both are zero, skip this pair */ 133 or $a7,$t0,$t1 134 beqz $a7,1f 135 136 /* load the destination */ 137 lw $a7,-4($a0) 138 139 pixel $a7,$t0,$a5,0 140 andi $a5, 0xFFFF 141 pixel $a7,$t1,$a5,16 142 sw $a5,-4($a0) 143 144 1: subu $a2,4 145 bgtz $a2,fourpixels 146 147 tail: 148 /* the pixel count underran, restore it now */ 149 addu $a2,4 150 151 /* handle the last 0..3 pixels */ 152 beqz $a2,done 153 onepixel: 154 lw $t0,($a1) 155 daddu $a0,2 156 daddu $a1,4 157 beqz $t0,1f 158 lhu $a7,-2($a0) 159 pixel $a7,$t0,$a5,0 160 sh $a5,-2($a0) 161 1: subu $a2,1 162 bnez $a2,onepixel 163 done: 164 DBG .set push 165 DBG .set mips32r2 166 DBG rdhwr $a0,$3 167 DBG mul $v0,$a0 168 DBG mul $v1,$a0 169 DBG .set pop 170 daddiu $sp, $sp, 40 171 j $ra 172 .end scanline_t32cb16blend_mips64 173
