mirror of
https://github.com/webmproject/libwebp.git
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301 lines
16 KiB
C
301 lines
16 KiB
C
// 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 "./neon.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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uint8x8x2_t a_b, c_d; \
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INIT_VECTOR2(a_b, a, b); \
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INIT_VECTOR2(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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// note: we represent the 33050 large constant as 32768 + 282
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static const int16_t kCoeffs1[4] = { 19077, 26149, 6419, 13320 };
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#define v255 vdup_n_u8(255)
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#define v_0x0f vdup_n_u8(15)
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#define STORE_Rgb(out, r, g, b) do { \
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uint8x8x3_t r_g_b; \
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INIT_VECTOR3(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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uint8x8x3_t b_g_r; \
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INIT_VECTOR3(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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uint8x8x4_t r_g_b_v255; \
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INIT_VECTOR4(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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uint8x8x4_t b_g_r_v255; \
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INIT_VECTOR4(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 STORE_Argb(out, r, g, b) do { \
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uint8x8x4_t v255_r_g_b; \
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INIT_VECTOR4(v255_r_g_b, v255, r, g, b); \
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vst4_u8(out, v255_r_g_b); \
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} while (0)
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#if !defined(WEBP_SWAP_16BIT_CSP)
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#define ZIP_U8(lo, hi) vzip_u8((lo), (hi))
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#else
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#define ZIP_U8(lo, hi) vzip_u8((hi), (lo))
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#endif
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#define STORE_Rgba4444(out, r, g, b) do { \
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const uint8x8_t r1 = vshl_n_u8(vshr_n_u8(r, 4), 4); /* 4bits */ \
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const uint8x8_t g1 = vshr_n_u8(g, 4); \
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const uint8x8_t ba = vorr_u8(b, v_0x0f); \
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const uint8x8_t rg = vorr_u8(r1, g1); \
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const uint8x8x2_t rgba4444 = ZIP_U8(rg, ba); \
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vst1q_u8(out, vcombine_u8(rgba4444.val[0], rgba4444.val[1])); \
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} while (0)
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#define STORE_Rgb565(out, r, g, b) do { \
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const uint8x8_t r1 = vshl_n_u8(vshr_n_u8(r, 3), 3); /* 5bits */ \
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const uint8x8_t g1 = vshr_n_u8(g, 5); /* upper 3bits */\
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const uint8x8_t g2 = vshl_n_u8(vshr_n_u8(g, 2), 5); /* lower 3bits */\
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const uint8x8_t b1 = vshr_n_u8(b, 3); /* 5bits */ \
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const uint8x8_t rg = vorr_u8(r1, g1); \
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const uint8x8_t gb = vorr_u8(g2, b1); \
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const uint8x8x2_t rgb565 = ZIP_U8(rg, gb); \
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vst1q_u8(out, vcombine_u8(rgb565.val[0], rgb565.val[1])); \
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} while (0)
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#define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) do { \
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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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const uint8x8_t y = vld1_u8((src_y) + (cur_x) + i); \
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const uint8x8_t u = vld1_u8((src_uv) + i + 0); \
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const uint8x8_t v = vld1_u8((src_uv) + i + 16); \
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const int16x8_t Y0 = vreinterpretq_s16_u16(vshll_n_u8(y, 7)); \
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const int16x8_t U0 = vreinterpretq_s16_u16(vshll_n_u8(u, 7)); \
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const int16x8_t V0 = vreinterpretq_s16_u16(vshll_n_u8(v, 7)); \
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const int16x8_t Y1 = vqdmulhq_lane_s16(Y0, coeff1, 0); \
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const int16x8_t R0 = vqdmulhq_lane_s16(V0, coeff1, 1); \
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const int16x8_t G0 = vqdmulhq_lane_s16(U0, coeff1, 2); \
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const int16x8_t G1 = vqdmulhq_lane_s16(V0, coeff1, 3); \
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const int16x8_t B0 = vqdmulhq_n_s16(U0, 282); \
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const int16x8_t R1 = vqaddq_s16(Y1, R_Rounder); \
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const int16x8_t G2 = vqaddq_s16(Y1, G_Rounder); \
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const int16x8_t B1 = vqaddq_s16(Y1, B_Rounder); \
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const int16x8_t R2 = vqaddq_s16(R0, R1); \
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const int16x8_t G3 = vqaddq_s16(G0, G1); \
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const int16x8_t B2 = vqaddq_s16(B0, B1); \
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const int16x8_t G4 = vqsubq_s16(G2, G3); \
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const int16x8_t B3 = vqaddq_s16(B2, U0); \
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const uint8x8_t R = vqshrun_n_s16(R2, YUV_FIX2); \
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const uint8x8_t G = vqshrun_n_s16(G4, YUV_FIX2); \
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const uint8x8_t B = vqshrun_n_s16(B3, YUV_FIX2); \
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STORE_ ## FMT(out + off, R, G, B); \
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} \
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} while (0)
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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 coeff1 = vld1_s16(kCoeffs1); \
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const int16x8_t R_Rounder = vdupq_n_s16(-14234); \
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const int16x8_t G_Rounder = vdupq_n_s16(8708); \
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const int16x8_t B_Rounder = vdupq_n_s16(-17685); \
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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(UpsampleRgbLinePair, Rgb, 3)
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NEON_UPSAMPLE_FUNC(UpsampleBgrLinePair, Bgr, 3)
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NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePair, Rgba, 4)
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NEON_UPSAMPLE_FUNC(UpsampleBgraLinePair, Bgra, 4)
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NEON_UPSAMPLE_FUNC(UpsampleArgbLinePair, Argb, 4)
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NEON_UPSAMPLE_FUNC(UpsampleRgba4444LinePair, Rgba4444, 2)
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NEON_UPSAMPLE_FUNC(UpsampleRgb565LinePair, Rgb565, 2)
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//------------------------------------------------------------------------------
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// Entry point
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extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
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extern void WebPInitUpsamplersNEON(void);
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WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersNEON(void) {
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WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair;
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WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
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WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair;
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WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
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WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
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WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
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WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
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WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
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WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
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WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
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WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
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}
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#endif // FANCY_UPSAMPLING
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#endif // WEBP_USE_NEON
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#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_NEON))
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WEBP_DSP_INIT_STUB(WebPInitUpsamplersNEON)
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#endif
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