1 /* libs/pixelflinger/t32cb16blend.S 2 ** 3 ** Copyright 2010, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #ifdef DEBUG 19 #define DBG 20 #else 21 #define DBG # 22 #endif 23 24 /* 25 * blend one of 2 16bpp RGB pixels held in dreg selected by shift 26 * with the 32bpp ABGR pixel held in src and store the result in fb 27 * 28 * Assumes that the dreg data is little endian and that 29 * the the second pixel (shift==16) will be merged into 30 * the fb result 31 * 32 * Uses $t0,$t6,$t7,$t8 33 */ 34 35 #if __mips==32 && __mips_isa_rev>=2 36 .macro pixel dreg src fb shift 37 /* 38 * sA = s >> 24 39 * f = 0x100 - (sA + (sA>>7)) 40 */ 41 DBG .set noat 42 DBG rdhwr $at,$2 43 DBG .set at 44 45 srl $t7,\src,24 46 srl $t6,$t7,7 47 addu $t7,$t6 48 li $t6,0x100 49 subu $t7,$t6,$t7 50 51 /* red */ 52 ext $t8,\dreg,\shift+6+5,5 # dst[\shift:15..11] 53 mul $t6,$t8,$t7 54 ext $t0,\dreg,\shift+5,6 # start green extraction dst[\shift:10..5] 55 ext $t8,\src,3,5 # src[7..3] 56 srl $t6,8 57 addu $t8,$t6 58 ins \fb,$t8,\shift+6+5,5 # dst[\shift:15..11] 59 60 /* green */ 61 mul $t8,$t0,$t7 62 ext $t0,\dreg,\shift,5 # start blue extraction dst[\shift:4..0] 63 ext $t6,\src,2+8,6 # src[15..10] 64 srl $t8,8 65 addu $t8,$t6 66 67 /* blue */ 68 mul $t0,$t0,$t7 69 ins \fb,$t8,\shift+5,6 # finish green insertion dst[\shift:10..5] 70 ext $t6,\src,(3+8+8),5 71 srl $t8,$t0,8 72 addu $t8,$t6 73 ins \fb,$t8,\shift,5 74 75 DBG .set noat 76 DBG rdhwr $t8,$2 77 DBG subu $t8,$at 78 DBG sltu $at,$t8,$v0 79 DBG movn $v0,$t8,$at 80 DBG sgtu $at,$t8,$v1 81 DBG movn $v1,$t8,$at 82 DBG .set at 83 .endm 84 85 #else 86 87 .macro pixel dreg src fb shift 88 /* 89 * sA = s >> 24 90 * f = 0x100 - (sA + (sA>>7)) 91 */ 92 DBG .set push 93 DBG .set noat 94 DBG .set mips32r2 95 DBG rdhwr $at,$2 96 DBG .set pop 97 98 srl $t7,\src,24 99 srl $t6,$t7,7 100 addu $t7,$t6 101 li $t6,0x100 102 subu $t7,$t6,$t7 103 104 /* 105 * red 106 * dR = (d >> (6 + 5)) & 0x1f; 107 * dR = (f*dR)>>8 108 * sR = (s >> ( 3)) & 0x1f; 109 * sR += dR 110 * fb |= sR << 11 111 */ 112 srl $t8,\dreg,\shift+6+5 113 .if \shift==0 114 and $t8,0x1f 115 .endif 116 mul $t8,$t8,$t7 117 srl $t6,\src,3 118 and $t6,0x1f 119 srl $t8,8 120 addu $t8,$t6 121 .if \shift!=0 122 sll $t8,\shift+11 123 or \fb,$t8 124 .else 125 sll \fb,$t8,11 126 .endif 127 128 /* 129 * green 130 * dG = (d >> 5) & 0x3f 131 * dG = (f*dG) >> 8 132 * sG = (s >> ( 8+2))&0x3F; 133 */ 134 srl $t8,\dreg,\shift+5 135 and $t8,0x3f 136 mul $t8,$t8,$t7 137 srl $t6,\src,8+2 138 and $t6,0x3f 139 srl $t8,8 140 addu $t8,$t6 141 sll $t8,\shift + 5 142 or \fb,$t8 143 144 /* blue */ 145 .if \shift!=0 146 srl $t8,\dreg,\shift 147 and $t8,0x1f 148 .else 149 and $t8,\dreg,0x1f 150 .endif 151 mul $t8,$t8,$t7 152 srl $t6,\src,(8+8+3) 153 and $t6,0x1f 154 srl $t8,8 155 addu $t8,$t6 156 .if \shift!=0 157 sll $t8,\shift 158 .endif 159 or \fb,$t8 160 DBG .set push 161 DBG .set noat 162 DBG .set mips32r2 163 DBG rdhwr $t8,$2 164 DBG subu $t8,$at 165 DBG sltu $at,$t8,$v0 166 DBG movn $v0,$t8,$at 167 DBG sgtu $at,$t8,$v1 168 DBG movn $v1,$t8,$at 169 DBG .set pop 170 .endm 171 #endif 172 173 .text 174 .align 175 176 .global scanline_t32cb16blend_mips 177 .ent scanline_t32cb16blend_mips 178 scanline_t32cb16blend_mips: 179 DBG li $v0,0xffffffff 180 DBG li $v1,0 181 /* Align the destination if necessary */ 182 and $t0,$a0,3 183 beqz $t0,aligned 184 185 /* as long as there is at least one pixel */ 186 beqz $a2,done 187 188 lw $t4,($a1) 189 addu $a0,2 190 addu $a1,4 191 beqz $t4,1f 192 lhu $t3,-2($a0) 193 pixel $t3,$t4,$t1,0 194 sh $t1,-2($a0) 195 1: subu $a2,1 196 197 aligned: 198 /* Check to see if its worth unrolling the loop */ 199 subu $a2,4 200 bltz $a2,tail 201 202 /* Process 4 pixels at a time */ 203 fourpixels: 204 /* 1st pair of pixels */ 205 lw $t4,0($a1) 206 lw $t5,4($a1) 207 addu $a0,8 208 addu $a1,16 209 210 /* both are zero, skip this pair */ 211 or $t3,$t4,$t5 212 beqz $t3,1f 213 214 /* load the destination */ 215 lw $t3,-8($a0) 216 217 pixel $t3,$t4,$t1,0 218 pixel $t3,$t5,$t1,16 219 sw $t1,-8($a0) 220 221 1: 222 /* 2nd pair of pixels */ 223 lw $t4,-8($a1) 224 lw $t5,-4($a1) 225 226 /* both are zero, skip this pair */ 227 or $t3,$t4,$t5 228 beqz $t3,1f 229 230 /* load the destination */ 231 lw $t3,-4($a0) 232 233 pixel $t3,$t4,$t1,0 234 pixel $t3,$t5,$t1,16 235 sw $t1,-4($a0) 236 237 1: subu $a2,4 238 bgtz $a2,fourpixels 239 240 tail: 241 /* the pixel count underran, restore it now */ 242 addu $a2,4 243 244 /* handle the last 0..3 pixels */ 245 beqz $a2,done 246 onepixel: 247 lw $t4,($a1) 248 addu $a0,2 249 addu $a1,4 250 beqz $t4,1f 251 lhu $t3,-2($a0) 252 pixel $t3,$t4,$t1,0 253 sh $t1,-2($a0) 254 1: subu $a2,1 255 bnez $a2,onepixel 256 done: 257 DBG .set push 258 DBG .set mips32r2 259 DBG rdhwr $a0,$3 260 DBG mul $v0,$a0 261 DBG mul $v1,$a0 262 DBG .set pop 263 j $ra 264 .end scanline_t32cb16blend_mips 265
