Source code
Revision control
Copy as Markdown
Other Tools
// Copyright 2011 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// NEON version of YUV to RGB upsampling functions.
//
// Author: mans@mansr.com (Mans Rullgard)
// Based on SSE code by: somnath@google.com (Somnath Banerjee)
#include "src/dsp/dsp.h"
#if defined(WEBP_USE_NEON)
#include <assert.h>
#include <arm_neon.h>
#include <string.h>
#include "src/dsp/neon.h"
#include "src/dsp/yuv.h"
#ifdef FANCY_UPSAMPLING
//-----------------------------------------------------------------------------
// U/V upsampling
// Loads 9 pixels each from rows r1 and r2 and generates 16 pixels.
#define UPSAMPLE_16PIXELS(r1, r2, out) do { \
const uint8x8_t a = vld1_u8(r1 + 0); \
const uint8x8_t b = vld1_u8(r1 + 1); \
const uint8x8_t c = vld1_u8(r2 + 0); \
const uint8x8_t d = vld1_u8(r2 + 1); \
/* a + b + c + d */ \
const uint16x8_t ad = vaddl_u8(a, d); \
const uint16x8_t bc = vaddl_u8(b, c); \
const uint16x8_t abcd = vaddq_u16(ad, bc); \
/* 3a + b + c + 3d */ \
const uint16x8_t al = vaddq_u16(abcd, vshlq_n_u16(ad, 1)); \
/* a + 3b + 3c + d */ \
const uint16x8_t bl = vaddq_u16(abcd, vshlq_n_u16(bc, 1)); \
\
const uint8x8_t diag2 = vshrn_n_u16(al, 3); \
const uint8x8_t diag1 = vshrn_n_u16(bl, 3); \
\
const uint8x8_t A = vrhadd_u8(a, diag1); \
const uint8x8_t B = vrhadd_u8(b, diag2); \
const uint8x8_t C = vrhadd_u8(c, diag2); \
const uint8x8_t D = vrhadd_u8(d, diag1); \
\
uint8x8x2_t A_B, C_D; \
INIT_VECTOR2(A_B, A, B); \
INIT_VECTOR2(C_D, C, D); \
vst2_u8(out + 0, A_B); \
vst2_u8(out + 32, C_D); \
} while (0)
// Turn the macro into a function for reducing code-size when non-critical
static void Upsample16Pixels_NEON(const uint8_t* r1, const uint8_t* r2,
uint8_t* out) {
UPSAMPLE_16PIXELS(r1, r2, out);
}
#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \
uint8_t r1[9], r2[9]; \
memcpy(r1, (tb), (num_pixels)); \
memcpy(r2, (bb), (num_pixels)); \
/* replicate last byte */ \
memset(r1 + (num_pixels), r1[(num_pixels) - 1], 9 - (num_pixels)); \
memset(r2 + (num_pixels), r2[(num_pixels) - 1], 9 - (num_pixels)); \
Upsample16Pixels_NEON(r1, r2, out); \
}
//-----------------------------------------------------------------------------
// YUV->RGB conversion
// note: we represent the 33050 large constant as 32768 + 282
static const int16_t kCoeffs1[4] = { 19077, 26149, 6419, 13320 };
#define v255 vdup_n_u8(255)
#define STORE_Rgb(out, r, g, b) do { \
uint8x8x3_t r_g_b; \
INIT_VECTOR3(r_g_b, r, g, b); \
vst3_u8(out, r_g_b); \
} while (0)
#define STORE_Bgr(out, r, g, b) do { \
uint8x8x3_t b_g_r; \
INIT_VECTOR3(b_g_r, b, g, r); \
vst3_u8(out, b_g_r); \
} while (0)
#define STORE_Rgba(out, r, g, b) do { \
uint8x8x4_t r_g_b_v255; \
INIT_VECTOR4(r_g_b_v255, r, g, b, v255); \
vst4_u8(out, r_g_b_v255); \
} while (0)
#define STORE_Bgra(out, r, g, b) do { \
uint8x8x4_t b_g_r_v255; \
INIT_VECTOR4(b_g_r_v255, b, g, r, v255); \
vst4_u8(out, b_g_r_v255); \
} while (0)
#define STORE_Argb(out, r, g, b) do { \
uint8x8x4_t v255_r_g_b; \
INIT_VECTOR4(v255_r_g_b, v255, r, g, b); \
vst4_u8(out, v255_r_g_b); \
} while (0)
#if (WEBP_SWAP_16BIT_CSP == 0)
#define ZIP_U8(lo, hi) vzip_u8((lo), (hi))
#else
#define ZIP_U8(lo, hi) vzip_u8((hi), (lo))
#endif
#define STORE_Rgba4444(out, r, g, b) do { \
const uint8x8_t rg = vsri_n_u8(r, g, 4); /* shift g, insert r */ \
const uint8x8_t ba = vsri_n_u8(b, v255, 4); /* shift a, insert b */ \
const uint8x8x2_t rgba4444 = ZIP_U8(rg, ba); \
vst1q_u8(out, vcombine_u8(rgba4444.val[0], rgba4444.val[1])); \
} while (0)
#define STORE_Rgb565(out, r, g, b) do { \
const uint8x8_t rg = vsri_n_u8(r, g, 5); /* shift g and insert r */ \
const uint8x8_t g1 = vshl_n_u8(g, 3); /* pre-shift g: 3bits */ \
const uint8x8_t gb = vsri_n_u8(g1, b, 3); /* shift b and insert g */ \
const uint8x8x2_t rgb565 = ZIP_U8(rg, gb); \
vst1q_u8(out, vcombine_u8(rgb565.val[0], rgb565.val[1])); \
} while (0)
#define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) do { \
int i; \
for (i = 0; i < N; i += 8) { \
const int off = ((cur_x) + i) * XSTEP; \
const uint8x8_t y = vld1_u8((src_y) + (cur_x) + i); \
const uint8x8_t u = vld1_u8((src_uv) + i + 0); \
const uint8x8_t v = vld1_u8((src_uv) + i + 16); \
const int16x8_t Y0 = vreinterpretq_s16_u16(vshll_n_u8(y, 7)); \
const int16x8_t U0 = vreinterpretq_s16_u16(vshll_n_u8(u, 7)); \
const int16x8_t V0 = vreinterpretq_s16_u16(vshll_n_u8(v, 7)); \
const int16x8_t Y1 = vqdmulhq_lane_s16(Y0, coeff1, 0); \
const int16x8_t R0 = vqdmulhq_lane_s16(V0, coeff1, 1); \
const int16x8_t G0 = vqdmulhq_lane_s16(U0, coeff1, 2); \
const int16x8_t G1 = vqdmulhq_lane_s16(V0, coeff1, 3); \
const int16x8_t B0 = vqdmulhq_n_s16(U0, 282); \
const int16x8_t R1 = vqaddq_s16(Y1, R_Rounder); \
const int16x8_t G2 = vqaddq_s16(Y1, G_Rounder); \
const int16x8_t B1 = vqaddq_s16(Y1, B_Rounder); \
const int16x8_t R2 = vqaddq_s16(R0, R1); \
const int16x8_t G3 = vqaddq_s16(G0, G1); \
const int16x8_t B2 = vqaddq_s16(B0, B1); \
const int16x8_t G4 = vqsubq_s16(G2, G3); \
const int16x8_t B3 = vqaddq_s16(B2, U0); \
const uint8x8_t R = vqshrun_n_s16(R2, YUV_FIX2); \
const uint8x8_t G = vqshrun_n_s16(G4, YUV_FIX2); \
const uint8x8_t B = vqshrun_n_s16(B3, YUV_FIX2); \
STORE_ ## FMT(out + off, R, G, B); \
} \
} while (0)
#define CONVERT1(FUNC, XSTEP, N, src_y, src_uv, rgb, cur_x) { \
int i; \
for (i = 0; i < N; i++) { \
const int off = ((cur_x) + i) * XSTEP; \
const int y = src_y[(cur_x) + i]; \
const int u = (src_uv)[i]; \
const int v = (src_uv)[i + 16]; \
FUNC(y, u, v, rgb + off); \
} \
}
#define CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, uv, \
top_dst, bottom_dst, cur_x, len) { \
CONVERT8(FMT, XSTEP, len, top_y, uv, top_dst, cur_x); \
if (bottom_y != NULL) { \
CONVERT8(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \
} \
}
#define CONVERT2RGB_1(FUNC, XSTEP, top_y, bottom_y, uv, \
top_dst, bottom_dst, cur_x, len) { \
CONVERT1(FUNC, XSTEP, len, top_y, uv, top_dst, cur_x); \
if (bottom_y != NULL) { \
CONVERT1(FUNC, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \
} \
}
#define NEON_UPSAMPLE_FUNC(FUNC_NAME, FMT, XSTEP) \
static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \
const uint8_t* top_u, const uint8_t* top_v, \
const uint8_t* cur_u, const uint8_t* cur_v, \
uint8_t* top_dst, uint8_t* bottom_dst, int len) { \
int block; \
/* 16 byte aligned array to cache reconstructed u and v */ \
uint8_t uv_buf[2 * 32 + 15]; \
uint8_t* const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \
const int uv_len = (len + 1) >> 1; \
/* 9 pixels must be read-able for each block */ \
const int num_blocks = (uv_len - 1) >> 3; \
const int leftover = uv_len - num_blocks * 8; \
const int last_pos = 1 + 16 * num_blocks; \
\
const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \
const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \
\
const int16x4_t coeff1 = vld1_s16(kCoeffs1); \
const int16x8_t R_Rounder = vdupq_n_s16(-14234); \
const int16x8_t G_Rounder = vdupq_n_s16(8708); \
const int16x8_t B_Rounder = vdupq_n_s16(-17685); \
\
/* Treat the first pixel in regular way */ \
assert(top_y != NULL); \
{ \
const int u0 = (top_u[0] + u_diag) >> 1; \
const int v0 = (top_v[0] + v_diag) >> 1; \
VP8YuvTo ## FMT(top_y[0], u0, v0, top_dst); \
} \
if (bottom_y != NULL) { \
const int u0 = (cur_u[0] + u_diag) >> 1; \
const int v0 = (cur_v[0] + v_diag) >> 1; \
VP8YuvTo ## FMT(bottom_y[0], u0, v0, bottom_dst); \
} \
\
for (block = 0; block < num_blocks; ++block) { \
UPSAMPLE_16PIXELS(top_u, cur_u, r_uv); \
UPSAMPLE_16PIXELS(top_v, cur_v, r_uv + 16); \
CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, r_uv, \
top_dst, bottom_dst, 16 * block + 1, 16); \
top_u += 8; \
cur_u += 8; \
top_v += 8; \
cur_v += 8; \
} \
\
UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv); \
UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 16); \
CONVERT2RGB_1(VP8YuvTo ## FMT, XSTEP, top_y, bottom_y, r_uv, \
top_dst, bottom_dst, last_pos, len - last_pos); \
}
// NEON variants of the fancy upsampler.
NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePair_NEON, Rgba, 4)
NEON_UPSAMPLE_FUNC(UpsampleBgraLinePair_NEON, Bgra, 4)
#if !defined(WEBP_REDUCE_CSP)
NEON_UPSAMPLE_FUNC(UpsampleRgbLinePair_NEON, Rgb, 3)
NEON_UPSAMPLE_FUNC(UpsampleBgrLinePair_NEON, Bgr, 3)
NEON_UPSAMPLE_FUNC(UpsampleArgbLinePair_NEON, Argb, 4)
NEON_UPSAMPLE_FUNC(UpsampleRgba4444LinePair_NEON, Rgba4444, 2)
NEON_UPSAMPLE_FUNC(UpsampleRgb565LinePair_NEON, Rgb565, 2)
#endif // WEBP_REDUCE_CSP
//------------------------------------------------------------------------------
// Entry point
extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
extern void WebPInitUpsamplersNEON(void);
WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersNEON(void) {
WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair_NEON;
WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair_NEON;
WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair_NEON;
WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair_NEON;
#if !defined(WEBP_REDUCE_CSP)
WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair_NEON;
WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair_NEON;
WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair_NEON;
WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair_NEON;
WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair_NEON;
WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair_NEON;
WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair_NEON;
#endif // WEBP_REDUCE_CSP
}
#endif // FANCY_UPSAMPLING
#endif // WEBP_USE_NEON
#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_NEON))
WEBP_DSP_INIT_STUB(WebPInitUpsamplersNEON)
#endif