187 lines
6.9 KiB
C
187 lines
6.9 KiB
C
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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// NEON version of rescaling functions
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_NEON)
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#include <arm_neon.h>
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#include <assert.h>
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#include "./neon.h"
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#include "../utils/rescaler.h"
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#define ROUNDER (WEBP_RESCALER_ONE >> 1)
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#define MULT_FIX_C(x, y) (((uint64_t)(x) * (y) + ROUNDER) >> WEBP_RESCALER_RFIX)
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#define LOAD_32x4(SRC, DST) const uint32x4_t DST = vld1q_u32((SRC))
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#define LOAD_32x8(SRC, DST0, DST1) \
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LOAD_32x4(SRC + 0, DST0); \
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LOAD_32x4(SRC + 4, DST1)
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#define STORE_32x8(SRC0, SRC1, DST) do { \
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vst1q_u32((DST) + 0, SRC0); \
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vst1q_u32((DST) + 4, SRC1); \
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} while (0);
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#if (WEBP_RESCALER_RFIX == 32)
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#define MAKE_HALF_CST(C) vdupq_n_s32((int32_t)((C) >> 1))
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#define MULT_FIX(A, B) /* note: B is actualy scale>>1. See MAKE_HALF_CST */ \
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vreinterpretq_u32_s32(vqrdmulhq_s32(vreinterpretq_s32_u32((A)), (B)))
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#else
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#error "MULT_FIX/WEBP_RESCALER_RFIX need some more work"
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#endif
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static uint32x4_t Interpolate(const rescaler_t* const frow,
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const rescaler_t* const irow,
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uint32_t A, uint32_t B) {
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LOAD_32x4(frow, A0);
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LOAD_32x4(irow, B0);
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const uint64x2_t C0 = vmull_n_u32(vget_low_u32(A0), A);
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const uint64x2_t C1 = vmull_n_u32(vget_high_u32(A0), A);
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const uint64x2_t D0 = vmlal_n_u32(C0, vget_low_u32(B0), B);
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const uint64x2_t D1 = vmlal_n_u32(C1, vget_high_u32(B0), B);
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const uint32x4_t E = vcombine_u32(
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vrshrn_n_u64(D0, WEBP_RESCALER_RFIX),
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vrshrn_n_u64(D1, WEBP_RESCALER_RFIX));
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return E;
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}
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static void RescalerExportRowExpand(WebPRescaler* const wrk) {
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int x_out;
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uint8_t* const dst = wrk->dst;
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rescaler_t* const irow = wrk->irow;
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const int x_out_max = wrk->dst_width * wrk->num_channels;
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const int max_span = x_out_max & ~7;
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const rescaler_t* const frow = wrk->frow;
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const uint32_t fy_scale = wrk->fy_scale;
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const int32x4_t fy_scale_half = MAKE_HALF_CST(fy_scale);
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assert(!WebPRescalerOutputDone(wrk));
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assert(wrk->y_accum <= 0);
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assert(wrk->y_expand);
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assert(wrk->y_sub != 0);
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if (wrk->y_accum == 0) {
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for (x_out = 0; x_out < max_span; x_out += 8) {
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LOAD_32x4(frow + x_out + 0, A0);
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LOAD_32x4(frow + x_out + 4, A1);
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const uint32x4_t B0 = MULT_FIX(A0, fy_scale_half);
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const uint32x4_t B1 = MULT_FIX(A1, fy_scale_half);
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const uint16x4_t C0 = vmovn_u32(B0);
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const uint16x4_t C1 = vmovn_u32(B1);
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const uint8x8_t D = vmovn_u16(vcombine_u16(C0, C1));
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vst1_u8(dst + x_out, D);
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}
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for (; x_out < x_out_max; ++x_out) {
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const uint32_t J = frow[x_out];
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const int v = (int)MULT_FIX_C(J, fy_scale);
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assert(v >= 0 && v <= 255);
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dst[x_out] = v;
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}
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} else {
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const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub);
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const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B);
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for (x_out = 0; x_out < max_span; x_out += 8) {
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const uint32x4_t C0 =
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Interpolate(frow + x_out + 0, irow + x_out + 0, A, B);
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const uint32x4_t C1 =
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Interpolate(frow + x_out + 4, irow + x_out + 4, A, B);
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const uint32x4_t D0 = MULT_FIX(C0, fy_scale_half);
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const uint32x4_t D1 = MULT_FIX(C1, fy_scale_half);
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const uint16x4_t E0 = vmovn_u32(D0);
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const uint16x4_t E1 = vmovn_u32(D1);
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const uint8x8_t F = vmovn_u16(vcombine_u16(E0, E1));
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vst1_u8(dst + x_out, F);
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}
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for (; x_out < x_out_max; ++x_out) {
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const uint64_t I = (uint64_t)A * frow[x_out]
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+ (uint64_t)B * irow[x_out];
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const uint32_t J = (uint32_t)((I + ROUNDER) >> WEBP_RESCALER_RFIX);
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const int v = (int)MULT_FIX_C(J, fy_scale);
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assert(v >= 0 && v <= 255);
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dst[x_out] = v;
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}
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}
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}
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static void RescalerExportRowShrink(WebPRescaler* const wrk) {
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int x_out;
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uint8_t* const dst = wrk->dst;
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rescaler_t* const irow = wrk->irow;
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const int x_out_max = wrk->dst_width * wrk->num_channels;
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const int max_span = x_out_max & ~7;
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const rescaler_t* const frow = wrk->frow;
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const uint32_t yscale = wrk->fy_scale * (-wrk->y_accum);
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const uint32_t fxy_scale = wrk->fxy_scale;
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const uint32x4_t zero = vdupq_n_u32(0);
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const int32x4_t yscale_half = MAKE_HALF_CST(yscale);
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const int32x4_t fxy_scale_half = MAKE_HALF_CST(fxy_scale);
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assert(!WebPRescalerOutputDone(wrk));
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assert(wrk->y_accum <= 0);
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assert(!wrk->y_expand);
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if (yscale) {
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for (x_out = 0; x_out < max_span; x_out += 8) {
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LOAD_32x8(frow + x_out, in0, in1);
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LOAD_32x8(irow + x_out, in2, in3);
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const uint32x4_t A0 = MULT_FIX(in0, yscale_half);
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const uint32x4_t A1 = MULT_FIX(in1, yscale_half);
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const uint32x4_t B0 = vqsubq_u32(in2, A0);
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const uint32x4_t B1 = vqsubq_u32(in3, A1);
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const uint32x4_t C0 = MULT_FIX(B0, fxy_scale_half);
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const uint32x4_t C1 = MULT_FIX(B1, fxy_scale_half);
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const uint16x4_t D0 = vmovn_u32(C0);
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const uint16x4_t D1 = vmovn_u32(C1);
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const uint8x8_t E = vmovn_u16(vcombine_u16(D0, D1));
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vst1_u8(dst + x_out, E);
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STORE_32x8(A0, A1, irow + x_out);
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}
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for (; x_out < x_out_max; ++x_out) {
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const uint32_t frac = (uint32_t)MULT_FIX_C(frow[x_out], yscale);
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const int v = (int)MULT_FIX_C(irow[x_out] - frac, wrk->fxy_scale);
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assert(v >= 0 && v <= 255);
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dst[x_out] = v;
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irow[x_out] = frac; // new fractional start
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}
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} else {
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for (x_out = 0; x_out < max_span; x_out += 8) {
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LOAD_32x8(irow + x_out, in0, in1);
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const uint32x4_t A0 = MULT_FIX(in0, fxy_scale_half);
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const uint32x4_t A1 = MULT_FIX(in1, fxy_scale_half);
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const uint16x4_t B0 = vmovn_u32(A0);
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const uint16x4_t B1 = vmovn_u32(A1);
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const uint8x8_t C = vmovn_u16(vcombine_u16(B0, B1));
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vst1_u8(dst + x_out, C);
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STORE_32x8(zero, zero, irow + x_out);
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}
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for (; x_out < x_out_max; ++x_out) {
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const int v = (int)MULT_FIX_C(irow[x_out], fxy_scale);
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assert(v >= 0 && v <= 255);
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dst[x_out] = v;
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irow[x_out] = 0;
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}
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}
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}
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//------------------------------------------------------------------------------
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extern void WebPRescalerDspInitNEON(void);
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WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitNEON(void) {
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WebPRescalerExportRowExpand = RescalerExportRowExpand;
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WebPRescalerExportRowShrink = RescalerExportRowShrink;
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}
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#else // !WEBP_USE_NEON
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WEBP_DSP_INIT_STUB(WebPRescalerDspInitNEON)
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#endif // WEBP_USE_NEON
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