| /* |
| * Copyright (C) 2014 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. |
| */ |
| |
| #define ENTRY(f) .text; .align 4; .globl f; .type f,#function; f: .fnstart |
| #define END(f) .fnend; .size f, .-f; |
| |
| .eabi_attribute 25,1 @Tag_ABI_align8_preserved |
| .arm |
| |
| /* Perform the actual YuvToRGB conversion in a macro, from register to |
| * register. This macro will be called from within several different wrapper |
| * variants for different data layouts. Y data starts in q8, but with the even |
| * and odd bytes split into d16 and d17 respectively. U and V are in d20 |
| * and d21. Working constants are pre-loaded into q13-q15, and q3 is |
| * pre-loaded with a constant 0xff alpha channel. |
| * |
| * The complicated arithmetic is the result of refactoring the original |
| * equations to avoid 16-bit overflow without losing any precision. |
| */ |
| .macro yuvkern |
| vmov.i8 d15, #149 |
| |
| vmull.u8 q1, d16, d15 // g0 = y0 * 149 |
| vmull.u8 q5, d17, d15 // g1 = y1 * 149 |
| |
| vmov.i8 d14, #50 |
| vmov.i8 d15, #104 |
| vmull.u8 q8, d20, d14 // g2 = u * 50 + v * 104 |
| vmlal.u8 q8, d21, d15 |
| |
| vshr.u8 d14, d21, #1 |
| vaddw.u8 q0, q1, d14 // r0 = y0 * 149 + (v >> 1) |
| vaddw.u8 q4, q5, d14 // r1 = y1 * 149 + (v >> 1) |
| |
| vshll.u8 q7, d20, #2 |
| vadd.u16 q2, q1, q7 // b0 = y0 * 149 + (u << 2) |
| vadd.u16 q6, q5, q7 // b1 = y1 * 149 + (u << 2) |
| |
| vmov.i8 d14, #204 |
| vmov.i8 d15, #254 |
| vmull.u8 q11, d21, d14 // r2 = v * 204 |
| vmull.u8 q12, d20, d15 // b2 = u * 254 |
| |
| vhadd.u16 q0, q11 // r0 = (r0 + r2) >> 1 |
| vhadd.u16 q4, q11 // r1 = (r1 + r2) >> 1 |
| vqadd.u16 q1, q14 // g0 = satu16(g0 + (-16 * 149 + 128 * 50 + 128 * 104) >> 0) |
| vqadd.u16 q5, q14 // g1 = satu16(g1 + (-16 * 149 + 128 * 50 + 128 * 104) >> 0) |
| vhadd.u16 q2, q12 // b0 = (b0 + b2) >> 1 |
| vhadd.u16 q6, q12 // b1 = (b1 + b2) >> 1 |
| |
| vqsub.u16 q0, q13 // r0 = satu16(r0 - (16 * 149 + (128 >> 1) + 128 * 204) >> 1) |
| vqsub.u16 q4, q13 // r1 = satu16(r1 - (16 * 149 + (128 >> 1) + 128 * 204) >> 1) |
| vqsub.u16 q1, q8 // g0 = satu16(g0 - g2) |
| vqsub.u16 q5, q8 // g1 = satu16(g1 - g2) |
| vqsub.u16 q2, q15 // b0 = satu16(b0 - (16 * 149 + (128 << 2) + 128 * 254) >> 1) |
| vqsub.u16 q6, q15 // b1 = satu16(b1 - (16 * 149 + (128 << 2) + 128 * 254) >> 1) |
| |
| vqrshrn.u16 d0, q0, #6 |
| vqrshrn.u16 d1, q1, #7 |
| vqrshrn.u16 d2, q4, #6 |
| vqrshrn.u16 d3, q5, #7 |
| vqrshrn.u16 d4, q2, #6 |
| vqrshrn.u16 d5, q6, #6 |
| |
| vzip.u8 q0, q1 |
| vzip.u8 d4, d5 |
| .endm |
| |
| /* Define the wrapper code which will load and store the data, iterate the |
| * correct number of times, and safely handle the remainder at the end of the |
| * loop. Some sections of code are switched out depending on the data packing |
| * being handled. |
| */ |
| .macro wrap_line kernel, interleaved=0, swapuv=0 |
| |
| movw r5, #((16 * 149 + (128 >> 1) + 128 * 204) >> 1) |
| vdup.i16 q13, r5 |
| movw r5, #((-16 * 149 + 128 * 50 + 128 * 104) >> 0) |
| vdup.i16 q14, r5 |
| movw r5, #((16 * 149 + (128 << 2) + 128 * 254) >> 1) |
| vdup.i16 q15, r5 |
| |
| vmov.i8 q3, #0xff |
| |
| subs r2, #16 |
| bhs 1f |
| b 2f |
| |
| .align 4 |
| 1: vld2.u8 {d16,d17}, [r1]! |
| pld [r1, #256] |
| .if \interleaved |
| vld2.u8 {d20,d21}, [r3]! |
| .if \swapuv |
| vswp d20, d21 |
| .endif |
| pld [r3, #256] |
| .else |
| vld1.u8 d20, [r3]! |
| vld1.u8 d21, [r4]! |
| pld [r3, #128] |
| pld [r4, #128] |
| .endif |
| |
| \kernel |
| |
| subs r2, #16 |
| |
| vst4.u8 {d0,d2,d4,d6}, [r0]! |
| vst4.u8 {d1,d3,d5,d7}, [r0]! |
| |
| bhs 1b |
| |
| 2: adds r2, #16 |
| beq 2f |
| |
| /* To handle the tail portion of the data (something less than 16 |
| * bytes) load small power-of-two chunks into working registers. It |
| * doesn't matter where they end up in the register; the same process |
| * will store them back out using the same positions and the |
| * interaction between neighbouring pixels is constrained to odd |
| * boundaries where the load operations don't interfere. |
| */ |
| vmov.i8 q8, #0 |
| vmov.i8 q10, #0 |
| |
| tst r2, #8 |
| beq 1f |
| vld1.u8 d17, [r1]! |
| .if \interleaved |
| vld1.u8 d21, [r3]! |
| .else |
| vld1.u32 d20[1], [r3]! |
| vld1.u32 d21[1], [r4]! |
| .endif |
| |
| 1: tst r2, #4 |
| beq 1f |
| vld1.u32 d16[1], [r1]! |
| .if \interleaved |
| vld1.u32 d20[1], [r3]! |
| .else |
| vld1.u16 d20[1], [r3]! |
| vld1.u16 d21[1], [r4]! |
| .endif |
| 1: tst r2, #2 |
| beq 1f |
| vld1.u16 d16[1], [r1]! |
| .if \interleaved |
| vld1.u16 d20[1], [r3]! |
| .else |
| vld1.u8 d20[1], [r3]! |
| vld1.u8 d21[1], [r4]! |
| .endif |
| 1: tst r2, #1 |
| beq 1f |
| vld1.u8 d16[1], [r1]! |
| .if \interleaved |
| vld1.u16 d20[0], [r3]! |
| .else |
| vld1.u8 d20[0], [r3]! |
| vld1.u8 d21[0], [r4]! |
| .endif |
| |
| /* One small impediment in the process above is that some of the load |
| * operations can't perform byte-wise structure deinterleaving at the |
| * same time as loading only part of a register. So the data is loaded |
| * linearly and unpacked manually at this point if necessary. |
| */ |
| 1: vuzp.8 d16, d17 |
| .if \interleaved |
| vuzp.8 d20, d21 |
| .if \swapuv |
| vswp d20, d21 |
| .endif |
| .endif |
| |
| \kernel |
| |
| /* As above but with the output; structured stores for partial vectors |
| * aren't available, so the data is re-packed first and stored linearly. |
| */ |
| vzip.8 q0, q2 |
| vzip.8 q1, q3 |
| vzip.8 q0, q1 |
| vzip.8 q2, q3 |
| |
| 1: tst r2, #8 |
| beq 1f |
| vst1.u8 {d4,d5,d6,d7}, [r0]! |
| |
| 1: tst r2, #4 |
| beq 1f |
| vst1.u8 {d2,d3}, [r0]! |
| 1: tst r2, #2 |
| beq 1f |
| vst1.u8 d1, [r0]! |
| 1: tst r2, #1 |
| beq 2f |
| vst1.u32 d0[1], [r0]! |
| 2: |
| .endm |
| |
| |
| /* void rsdIntrinsicYuv2_K( |
| * void *out, // r0 |
| * void const *yin, // r1 |
| * void const *uin, // r2 |
| * void const *vin, // r3 |
| * size_t xstart, // [sp] |
| * size_t xend); // [sp+#4] |
| */ |
| ENTRY(rsdIntrinsicYuv2_K) |
| push {r4,r5} |
| ldr r5, [sp, #8] |
| mov r4, r3 |
| mov r3, r2 |
| ldr r2, [sp, #12] |
| |
| add r0, r5, LSL #2 |
| add r1, r5 |
| add r3, r5, LSR #1 |
| add r4, r5, LSR #1 |
| sub r2, r5 |
| |
| vpush {d8-d15} |
| |
| wrap_line yuvkern, 0 |
| |
| vpop {d8-d15} |
| pop {r4,r5} |
| bx lr |
| END(rsdIntrinsicYuv2_K) |
| |
| /* void rsdIntrinsicYuv_K( |
| * void *out, // r0 |
| * void const *yin, // r1 |
| * void const *uvin, // r2 |
| * size_t xstart, // r3 |
| * size_t xend); // [sp] |
| */ |
| ENTRY(rsdIntrinsicYuv_K) |
| push {r4,r5} |
| bic r4, r3, #1 |
| add r3, r2, r4 |
| ldr r2, [sp, #8] |
| |
| add r0, r4, LSL #2 |
| add r1, r4 |
| sub r2, r4 |
| |
| vpush {d8-d15} |
| |
| wrap_line yuvkern, 1, 1 |
| |
| vpop {d8-d15} |
| pop {r4,r5} |
| bx lr |
| END(rsdIntrinsicYuv_K) |
| |
| /* void rsdIntrinsicYuvR_K( |
| * void *out, // r0 |
| * void const *yin, // r1 |
| * void const *uvin, // r2 |
| * size_t xstart, // r3 |
| * size_t xend); // [sp] |
| */ |
| ENTRY(rsdIntrinsicYuvR_K) |
| push {r4,r5} |
| bic r4, r3, #1 |
| add r3, r2, r4 |
| ldr r2, [sp, #8] |
| |
| add r0, r4, LSL #2 |
| add r1, r4 |
| sub r2, r4 |
| |
| vpush {d8-d15} |
| |
| wrap_line yuvkern, 1 |
| |
| vpop {d8-d15} |
| pop {r4,r5} |
| bx lr |
| END(rsdIntrinsicYuvR_K) |
