266 lines
14 KiB
C
266 lines
14 KiB
C
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// Copyright 2011 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 YUV to RGB upsampling functions.
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//
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// Author: mans@mansr.com (Mans Rullgard)
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// Based on SSE code by: somnath@google.com (Somnath Banerjee)
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#include "./dsp.h"
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#if defined(WEBP_USE_NEON)
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#include <assert.h>
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#include <arm_neon.h>
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#include <string.h>
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#include "./yuv.h"
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#ifdef FANCY_UPSAMPLING
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//-----------------------------------------------------------------------------
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// U/V upsampling
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// Loads 9 pixels each from rows r1 and r2 and generates 16 pixels.
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#define UPSAMPLE_16PIXELS(r1, r2, out) { \
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uint8x8_t a = vld1_u8(r1); \
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uint8x8_t b = vld1_u8(r1 + 1); \
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uint8x8_t c = vld1_u8(r2); \
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uint8x8_t d = vld1_u8(r2 + 1); \
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\
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uint16x8_t al = vshll_n_u8(a, 1); \
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uint16x8_t bl = vshll_n_u8(b, 1); \
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uint16x8_t cl = vshll_n_u8(c, 1); \
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uint16x8_t dl = vshll_n_u8(d, 1); \
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\
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uint8x8_t diag1, diag2; \
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uint16x8_t sl; \
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\
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/* a + b + c + d */ \
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sl = vaddl_u8(a, b); \
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sl = vaddw_u8(sl, c); \
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sl = vaddw_u8(sl, d); \
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\
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al = vaddq_u16(sl, al); /* 3a + b + c + d */ \
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bl = vaddq_u16(sl, bl); /* a + 3b + c + d */ \
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\
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al = vaddq_u16(al, dl); /* 3a + b + c + 3d */ \
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bl = vaddq_u16(bl, cl); /* a + 3b + 3c + d */ \
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\
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diag2 = vshrn_n_u16(al, 3); \
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diag1 = vshrn_n_u16(bl, 3); \
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\
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a = vrhadd_u8(a, diag1); \
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b = vrhadd_u8(b, diag2); \
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c = vrhadd_u8(c, diag2); \
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d = vrhadd_u8(d, diag1); \
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\
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{ \
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const uint8x8x2_t a_b = {{ a, b }}; \
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const uint8x8x2_t c_d = {{ c, d }}; \
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vst2_u8(out, a_b); \
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vst2_u8(out + 32, c_d); \
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} \
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}
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// Turn the macro into a function for reducing code-size when non-critical
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static void Upsample16Pixels(const uint8_t *r1, const uint8_t *r2,
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uint8_t *out) {
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UPSAMPLE_16PIXELS(r1, r2, out);
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}
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#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \
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uint8_t r1[9], r2[9]; \
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memcpy(r1, (tb), (num_pixels)); \
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memcpy(r2, (bb), (num_pixels)); \
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/* replicate last byte */ \
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memset(r1 + (num_pixels), r1[(num_pixels) - 1], 9 - (num_pixels)); \
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memset(r2 + (num_pixels), r2[(num_pixels) - 1], 9 - (num_pixels)); \
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Upsample16Pixels(r1, r2, out); \
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}
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//-----------------------------------------------------------------------------
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// YUV->RGB conversion
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static const int16_t kCoeffs[4] = { kYScale, kVToR, kUToG, kVToG };
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#define v255 vmov_n_u8(255)
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#define STORE_Rgb(out, r, g, b) do { \
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const uint8x8x3_t r_g_b = {{ r, g, b }}; \
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vst3_u8(out, r_g_b); \
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} while (0)
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#define STORE_Bgr(out, r, g, b) do { \
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const uint8x8x3_t b_g_r = {{ b, g, r }}; \
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vst3_u8(out, b_g_r); \
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} while (0)
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#define STORE_Rgba(out, r, g, b) do { \
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const uint8x8x4_t r_g_b_v255 = {{ r, g, b, v255 }}; \
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vst4_u8(out, r_g_b_v255); \
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} while (0)
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#define STORE_Bgra(out, r, g, b) do { \
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const uint8x8x4_t b_g_r_v255 = {{ b, g, r, v255 }}; \
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vst4_u8(out, b_g_r_v255); \
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} while (0)
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#define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) { \
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int i; \
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for (i = 0; i < N; i += 8) { \
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const int off = ((cur_x) + i) * XSTEP; \
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uint8x8_t y = vld1_u8((src_y) + (cur_x) + i); \
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uint8x8_t u = vld1_u8((src_uv) + i); \
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uint8x8_t v = vld1_u8((src_uv) + i + 16); \
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const int16x8_t yy = vreinterpretq_s16_u16(vsubl_u8(y, u16)); \
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const int16x8_t uu = vreinterpretq_s16_u16(vsubl_u8(u, u128)); \
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const int16x8_t vv = vreinterpretq_s16_u16(vsubl_u8(v, u128)); \
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int32x4_t yl = vmull_lane_s16(vget_low_s16(yy), cf16, 0); \
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int32x4_t yh = vmull_lane_s16(vget_high_s16(yy), cf16, 0); \
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const int32x4_t rl = vmlal_lane_s16(yl, vget_low_s16(vv), cf16, 1);\
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const int32x4_t rh = vmlal_lane_s16(yh, vget_high_s16(vv), cf16, 1);\
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int32x4_t gl = vmlsl_lane_s16(yl, vget_low_s16(uu), cf16, 2); \
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int32x4_t gh = vmlsl_lane_s16(yh, vget_high_s16(uu), cf16, 2); \
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const int32x4_t bl = vmovl_s16(vget_low_s16(uu)); \
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const int32x4_t bh = vmovl_s16(vget_high_s16(uu)); \
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gl = vmlsl_lane_s16(gl, vget_low_s16(vv), cf16, 3); \
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gh = vmlsl_lane_s16(gh, vget_high_s16(vv), cf16, 3); \
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yl = vmlaq_lane_s32(yl, bl, cf32, 0); \
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yh = vmlaq_lane_s32(yh, bh, cf32, 0); \
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/* vrshrn_n_s32() already incorporates the rounding constant */ \
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y = vqmovun_s16(vcombine_s16(vrshrn_n_s32(rl, YUV_FIX2), \
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vrshrn_n_s32(rh, YUV_FIX2))); \
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u = vqmovun_s16(vcombine_s16(vrshrn_n_s32(gl, YUV_FIX2), \
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vrshrn_n_s32(gh, YUV_FIX2))); \
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v = vqmovun_s16(vcombine_s16(vrshrn_n_s32(yl, YUV_FIX2), \
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vrshrn_n_s32(yh, YUV_FIX2))); \
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STORE_ ## FMT(out + off, y, u, v); \
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} \
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}
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#define CONVERT1(FUNC, XSTEP, N, src_y, src_uv, rgb, cur_x) { \
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int i; \
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for (i = 0; i < N; i++) { \
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const int off = ((cur_x) + i) * XSTEP; \
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const int y = src_y[(cur_x) + i]; \
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const int u = (src_uv)[i]; \
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const int v = (src_uv)[i + 16]; \
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FUNC(y, u, v, rgb + off); \
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} \
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}
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#define CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, uv, \
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top_dst, bottom_dst, cur_x, len) { \
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CONVERT8(FMT, XSTEP, len, top_y, uv, top_dst, cur_x) \
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if (bottom_y != NULL) { \
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CONVERT8(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x) \
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} \
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}
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#define CONVERT2RGB_1(FUNC, XSTEP, top_y, bottom_y, uv, \
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top_dst, bottom_dst, cur_x, len) { \
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CONVERT1(FUNC, XSTEP, len, top_y, uv, top_dst, cur_x); \
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if (bottom_y != NULL) { \
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CONVERT1(FUNC, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \
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} \
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}
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#define NEON_UPSAMPLE_FUNC(FUNC_NAME, FMT, XSTEP) \
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static void FUNC_NAME(const uint8_t *top_y, const uint8_t *bottom_y, \
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const uint8_t *top_u, const uint8_t *top_v, \
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const uint8_t *cur_u, const uint8_t *cur_v, \
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uint8_t *top_dst, uint8_t *bottom_dst, int len) { \
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int block; \
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/* 16 byte aligned array to cache reconstructed u and v */ \
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uint8_t uv_buf[2 * 32 + 15]; \
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uint8_t *const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \
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const int uv_len = (len + 1) >> 1; \
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/* 9 pixels must be read-able for each block */ \
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const int num_blocks = (uv_len - 1) >> 3; \
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const int leftover = uv_len - num_blocks * 8; \
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const int last_pos = 1 + 16 * num_blocks; \
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\
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const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \
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const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \
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\
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const int16x4_t cf16 = vld1_s16(kCoeffs); \
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const int32x2_t cf32 = vmov_n_s32(kUToB); \
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const uint8x8_t u16 = vmov_n_u8(16); \
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const uint8x8_t u128 = vmov_n_u8(128); \
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\
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/* Treat the first pixel in regular way */ \
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assert(top_y != NULL); \
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{ \
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const int u0 = (top_u[0] + u_diag) >> 1; \
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const int v0 = (top_v[0] + v_diag) >> 1; \
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VP8YuvTo ## FMT(top_y[0], u0, v0, top_dst); \
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} \
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if (bottom_y != NULL) { \
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const int u0 = (cur_u[0] + u_diag) >> 1; \
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const int v0 = (cur_v[0] + v_diag) >> 1; \
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VP8YuvTo ## FMT(bottom_y[0], u0, v0, bottom_dst); \
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} \
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\
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for (block = 0; block < num_blocks; ++block) { \
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UPSAMPLE_16PIXELS(top_u, cur_u, r_uv); \
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UPSAMPLE_16PIXELS(top_v, cur_v, r_uv + 16); \
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CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, r_uv, \
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top_dst, bottom_dst, 16 * block + 1, 16); \
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top_u += 8; \
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cur_u += 8; \
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top_v += 8; \
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cur_v += 8; \
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} \
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\
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UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv); \
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UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 16); \
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CONVERT2RGB_1(VP8YuvTo ## FMT, XSTEP, top_y, bottom_y, r_uv, \
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top_dst, bottom_dst, last_pos, len - last_pos); \
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}
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// NEON variants of the fancy upsampler.
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NEON_UPSAMPLE_FUNC(UpsampleRgbLinePairNEON, Rgb, 3)
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NEON_UPSAMPLE_FUNC(UpsampleBgrLinePairNEON, Bgr, 3)
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NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePairNEON, Rgba, 4)
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NEON_UPSAMPLE_FUNC(UpsampleBgraLinePairNEON, Bgra, 4)
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#endif // FANCY_UPSAMPLING
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#endif // WEBP_USE_NEON
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//------------------------------------------------------------------------------
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#ifdef FANCY_UPSAMPLING
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extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
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void WebPInitUpsamplersNEON(void) {
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#if defined(WEBP_USE_NEON)
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WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePairNEON;
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WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePairNEON;
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WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePairNEON;
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WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePairNEON;
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#endif // WEBP_USE_NEON
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}
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void WebPInitPremultiplyNEON(void) {
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#if defined(WEBP_USE_NEON)
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WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePairNEON;
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WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePairNEON;
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#endif // WEBP_USE_NEON
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}
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#else
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// this empty function is to avoid an empty .o
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void WebPInitPremultiplyNEON(void) {}
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#endif // FANCY_UPSAMPLING
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