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224 lines
7.9 KiB
C++
224 lines
7.9 KiB
C++
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// contributor Siarhei Siamashka <siarhei.siamashka@gmail.com>
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#include "yuv_convert.h"
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#include "ycbcr_to_rgb565.h"
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#ifdef HAVE_YCBCR_TO_RGB565
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namespace mozilla {
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namespace gfx {
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# if defined(MOZILLA_MAY_SUPPORT_NEON)
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void __attribute((noinline)) yuv42x_to_rgb565_row_neon(uint16 *dst,
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const uint8 *y,
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const uint8 *u,
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const uint8 *v,
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int n,
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int oddflag)
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{
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static __attribute__((aligned(16))) uint16 acc_r[8] = {
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22840, 22840, 22840, 22840, 22840, 22840, 22840, 22840,
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};
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static __attribute__((aligned(16))) uint16 acc_g[8] = {
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17312, 17312, 17312, 17312, 17312, 17312, 17312, 17312,
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};
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static __attribute__((aligned(16))) uint16 acc_b[8] = {
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28832, 28832, 28832, 28832, 28832, 28832, 28832, 28832,
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};
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/*
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* Registers:
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* q0, q1 : d0, d1, d2, d3 - are used for initial loading of YUV data
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* q2 : d4, d5 - are used for storing converted RGB data
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* q3 : d6, d7 - are used for temporary storage
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*
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* q4-q7 - reserved
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*
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* q8, q9 : d16, d17, d18, d19 - are used for expanded Y data
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* q10 : d20, d21
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* q11 : d22, d23
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* q12 : d24, d25
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* q13 : d26, d27
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* q13, q14, q15 - various constants (#16, #149, #204, #50, #104, #154)
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*/
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asm volatile (
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".fpu neon\n"
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".macro convert_macroblock size\n"
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/* load up to 16 source pixels */
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".if \\size == 16\n"
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"pld [%[y], #64]\n"
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"pld [%[u], #64]\n"
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"pld [%[v], #64]\n"
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"vld1.8 {d1}, [%[y]]!\n"
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"vld1.8 {d3}, [%[y]]!\n"
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"vld1.8 {d0}, [%[u]]!\n"
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"vld1.8 {d2}, [%[v]]!\n"
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".elseif \\size == 8\n"
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"vld1.8 {d1}, [%[y]]!\n"
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"vld1.8 {d0[0]}, [%[u]]!\n"
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"vld1.8 {d0[1]}, [%[u]]!\n"
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"vld1.8 {d0[2]}, [%[u]]!\n"
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"vld1.8 {d0[3]}, [%[u]]!\n"
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"vld1.8 {d2[0]}, [%[v]]!\n"
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"vld1.8 {d2[1]}, [%[v]]!\n"
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"vld1.8 {d2[2]}, [%[v]]!\n"
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"vld1.8 {d2[3]}, [%[v]]!\n"
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".elseif \\size == 4\n"
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"vld1.8 {d1[0]}, [%[y]]!\n"
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"vld1.8 {d1[1]}, [%[y]]!\n"
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"vld1.8 {d1[2]}, [%[y]]!\n"
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"vld1.8 {d1[3]}, [%[y]]!\n"
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"vld1.8 {d0[0]}, [%[u]]!\n"
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"vld1.8 {d0[1]}, [%[u]]!\n"
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"vld1.8 {d2[0]}, [%[v]]!\n"
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"vld1.8 {d2[1]}, [%[v]]!\n"
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".elseif \\size == 2\n"
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"vld1.8 {d1[0]}, [%[y]]!\n"
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"vld1.8 {d1[1]}, [%[y]]!\n"
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"vld1.8 {d0[0]}, [%[u]]!\n"
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"vld1.8 {d2[0]}, [%[v]]!\n"
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".elseif \\size == 1\n"
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"vld1.8 {d1[0]}, [%[y]]!\n"
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"vld1.8 {d0[0]}, [%[u]]!\n"
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"vld1.8 {d2[0]}, [%[v]]!\n"
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".else\n"
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".error \"unsupported macroblock size\"\n"
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".endif\n"
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/* d1 - Y data (first 8 bytes) */
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/* d3 - Y data (next 8 bytes) */
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/* d0 - U data, d2 - V data */
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/* split even and odd Y color components */
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"vuzp.8 d1, d3\n" /* d1 - evenY, d3 - oddY */
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/* clip upper and lower boundaries */
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"vqadd.u8 q0, q0, q4\n"
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"vqadd.u8 q1, q1, q4\n"
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"vqsub.u8 q0, q0, q5\n"
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"vqsub.u8 q1, q1, q5\n"
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"vshr.u8 d4, d2, #1\n" /* d4 = V >> 1 */
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"vmull.u8 q8, d1, d27\n" /* q8 = evenY * 149 */
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"vmull.u8 q9, d3, d27\n" /* q9 = oddY * 149 */
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"vld1.16 {d20, d21}, [%[acc_r], :128]\n" /* q10 - initialize accumulator for red */
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"vsubw.u8 q10, q10, d4\n" /* red acc -= (V >> 1) */
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"vmlsl.u8 q10, d2, d28\n" /* red acc -= V * 204 */
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"vld1.16 {d22, d23}, [%[acc_g], :128]\n" /* q11 - initialize accumulator for green */
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"vmlsl.u8 q11, d2, d30\n" /* green acc -= V * 104 */
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"vmlsl.u8 q11, d0, d29\n" /* green acc -= U * 50 */
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"vld1.16 {d24, d25}, [%[acc_b], :128]\n" /* q12 - initialize accumulator for blue */
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"vmlsl.u8 q12, d0, d30\n" /* blue acc -= U * 104 */
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"vmlsl.u8 q12, d0, d31\n" /* blue acc -= U * 154 */
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"vhsub.s16 q3, q8, q10\n" /* calculate even red components */
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"vhsub.s16 q10, q9, q10\n" /* calculate odd red components */
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"vqshrun.s16 d0, q3, #6\n" /* right shift, narrow and saturate even red components */
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"vqshrun.s16 d3, q10, #6\n" /* right shift, narrow and saturate odd red components */
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"vhadd.s16 q3, q8, q11\n" /* calculate even green components */
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"vhadd.s16 q11, q9, q11\n" /* calculate odd green components */
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"vqshrun.s16 d1, q3, #6\n" /* right shift, narrow and saturate even green components */
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"vqshrun.s16 d4, q11, #6\n" /* right shift, narrow and saturate odd green components */
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"vhsub.s16 q3, q8, q12\n" /* calculate even blue components */
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"vhsub.s16 q12, q9, q12\n" /* calculate odd blue components */
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"vqshrun.s16 d2, q3, #6\n" /* right shift, narrow and saturate even blue components */
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"vqshrun.s16 d5, q12, #6\n" /* right shift, narrow and saturate odd blue components */
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"vzip.8 d0, d3\n" /* join even and odd red components */
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"vzip.8 d1, d4\n" /* join even and odd green components */
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"vzip.8 d2, d5\n" /* join even and odd blue components */
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"vshll.u8 q3, d0, #8\n\t"
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"vshll.u8 q8, d1, #8\n\t"
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"vshll.u8 q9, d2, #8\n\t"
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"vsri.u16 q3, q8, #5\t\n"
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"vsri.u16 q3, q9, #11\t\n"
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/* store pixel data to memory */
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".if \\size == 16\n"
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" vst1.16 {d6, d7}, [%[dst]]!\n"
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" vshll.u8 q3, d3, #8\n\t"
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" vshll.u8 q8, d4, #8\n\t"
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" vshll.u8 q9, d5, #8\n\t"
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" vsri.u16 q3, q8, #5\t\n"
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" vsri.u16 q3, q9, #11\t\n"
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" vst1.16 {d6, d7}, [%[dst]]!\n"
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".elseif \\size == 8\n"
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" vst1.16 {d6, d7}, [%[dst]]!\n"
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".elseif \\size == 4\n"
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" vst1.16 {d6}, [%[dst]]!\n"
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".elseif \\size == 2\n"
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" vst1.16 {d6[0]}, [%[dst]]!\n"
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" vst1.16 {d6[1]}, [%[dst]]!\n"
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".elseif \\size == 1\n"
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" vst1.16 {d6[0]}, [%[dst]]!\n"
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".endif\n"
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".endm\n"
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"vmov.u8 d8, #15\n" /* add this to U/V to saturate upper boundary */
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"vmov.u8 d9, #20\n" /* add this to Y to saturate upper boundary */
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"vmov.u8 d10, #31\n" /* sub this from U/V to saturate lower boundary */
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"vmov.u8 d11, #36\n" /* sub this from Y to saturate lower boundary */
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"vmov.u8 d26, #16\n"
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"vmov.u8 d27, #149\n"
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"vmov.u8 d28, #204\n"
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"vmov.u8 d29, #50\n"
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"vmov.u8 d30, #104\n"
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"vmov.u8 d31, #154\n"
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"cmp %[oddflag], #0\n"
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"beq 1f\n"
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"convert_macroblock 1\n"
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"sub %[n], %[n], #1\n"
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"1:\n"
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"subs %[n], %[n], #16\n"
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"blt 2f\n"
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"1:\n"
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"convert_macroblock 16\n"
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"subs %[n], %[n], #16\n"
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"bge 1b\n"
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"2:\n"
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"tst %[n], #8\n"
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"beq 3f\n"
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"convert_macroblock 8\n"
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"3:\n"
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"tst %[n], #4\n"
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"beq 4f\n"
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"convert_macroblock 4\n"
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"4:\n"
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"tst %[n], #2\n"
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"beq 5f\n"
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"convert_macroblock 2\n"
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"5:\n"
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"tst %[n], #1\n"
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"beq 6f\n"
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"convert_macroblock 1\n"
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"6:\n"
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".purgem convert_macroblock\n"
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: [y] "+&r" (y), [u] "+&r" (u), [v] "+&r" (v), [dst] "+&r" (dst), [n] "+&r" (n)
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: [acc_r] "r" (&acc_r[0]), [acc_g] "r" (&acc_g[0]), [acc_b] "r" (&acc_b[0]),
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[oddflag] "r" (oddflag)
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: "cc", "memory",
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"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
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"d8", "d9", "d10", "d11", /* "d12", "d13", "d14", "d15", */
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"d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
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"d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"
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);
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}
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# endif // MOZILLA_MAY_SUPPORT_NEON
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} // namespace gfx
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} // namespace mozilla
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#endif // HAVE_YCBCR_TO_RGB565
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