333 lines
12 KiB
C
333 lines
12 KiB
C
// Copyright 2014 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 variant of methods for lossless decoder
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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 "./lossless.h"
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#include "./neon.h"
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//------------------------------------------------------------------------------
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// Colorspace conversion functions
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#if !defined(WORK_AROUND_GCC)
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// gcc 4.6.0 had some trouble (NDK-r9) with this code. We only use it for
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// gcc-4.8.x at least.
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static void ConvertBGRAToRGBA(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~15);
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for (; src < end; src += 16) {
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uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
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// swap B and R. (VSWP d0,d2 has no intrinsics equivalent!)
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const uint8x16_t tmp = pixel.val[0];
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pixel.val[0] = pixel.val[2];
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pixel.val[2] = tmp;
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vst4q_u8(dst, pixel);
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dst += 64;
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}
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VP8LConvertBGRAToRGBA_C(src, num_pixels & 15, dst); // left-overs
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}
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static void ConvertBGRAToBGR(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~15);
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for (; src < end; src += 16) {
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const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
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const uint8x16x3_t tmp = { { pixel.val[0], pixel.val[1], pixel.val[2] } };
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vst3q_u8(dst, tmp);
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dst += 48;
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}
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VP8LConvertBGRAToBGR_C(src, num_pixels & 15, dst); // left-overs
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}
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static void ConvertBGRAToRGB(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~15);
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for (; src < end; src += 16) {
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const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
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const uint8x16x3_t tmp = { { pixel.val[2], pixel.val[1], pixel.val[0] } };
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vst3q_u8(dst, tmp);
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dst += 48;
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}
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VP8LConvertBGRAToRGB_C(src, num_pixels & 15, dst); // left-overs
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}
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#else // WORK_AROUND_GCC
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// gcc-4.6.0 fallback
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static const uint8_t kRGBAShuffle[8] = { 2, 1, 0, 3, 6, 5, 4, 7 };
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static void ConvertBGRAToRGBA(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~1);
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const uint8x8_t shuffle = vld1_u8(kRGBAShuffle);
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for (; src < end; src += 2) {
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const uint8x8_t pixels = vld1_u8((uint8_t*)src);
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vst1_u8(dst, vtbl1_u8(pixels, shuffle));
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dst += 8;
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}
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VP8LConvertBGRAToRGBA_C(src, num_pixels & 1, dst); // left-overs
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}
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static const uint8_t kBGRShuffle[3][8] = {
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{ 0, 1, 2, 4, 5, 6, 8, 9 },
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{ 10, 12, 13, 14, 16, 17, 18, 20 },
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{ 21, 22, 24, 25, 26, 28, 29, 30 }
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};
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static void ConvertBGRAToBGR(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~7);
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const uint8x8_t shuffle0 = vld1_u8(kBGRShuffle[0]);
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const uint8x8_t shuffle1 = vld1_u8(kBGRShuffle[1]);
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const uint8x8_t shuffle2 = vld1_u8(kBGRShuffle[2]);
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for (; src < end; src += 8) {
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uint8x8x4_t pixels;
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INIT_VECTOR4(pixels,
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vld1_u8((const uint8_t*)(src + 0)),
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vld1_u8((const uint8_t*)(src + 2)),
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vld1_u8((const uint8_t*)(src + 4)),
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vld1_u8((const uint8_t*)(src + 6)));
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vst1_u8(dst + 0, vtbl4_u8(pixels, shuffle0));
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vst1_u8(dst + 8, vtbl4_u8(pixels, shuffle1));
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vst1_u8(dst + 16, vtbl4_u8(pixels, shuffle2));
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dst += 8 * 3;
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}
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VP8LConvertBGRAToBGR_C(src, num_pixels & 7, dst); // left-overs
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}
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static const uint8_t kRGBShuffle[3][8] = {
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{ 2, 1, 0, 6, 5, 4, 10, 9 },
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{ 8, 14, 13, 12, 18, 17, 16, 22 },
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{ 21, 20, 26, 25, 24, 30, 29, 28 }
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};
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static void ConvertBGRAToRGB(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~7);
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const uint8x8_t shuffle0 = vld1_u8(kRGBShuffle[0]);
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const uint8x8_t shuffle1 = vld1_u8(kRGBShuffle[1]);
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const uint8x8_t shuffle2 = vld1_u8(kRGBShuffle[2]);
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for (; src < end; src += 8) {
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uint8x8x4_t pixels;
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INIT_VECTOR4(pixels,
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vld1_u8((const uint8_t*)(src + 0)),
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vld1_u8((const uint8_t*)(src + 2)),
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vld1_u8((const uint8_t*)(src + 4)),
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vld1_u8((const uint8_t*)(src + 6)));
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vst1_u8(dst + 0, vtbl4_u8(pixels, shuffle0));
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vst1_u8(dst + 8, vtbl4_u8(pixels, shuffle1));
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vst1_u8(dst + 16, vtbl4_u8(pixels, shuffle2));
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dst += 8 * 3;
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}
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VP8LConvertBGRAToRGB_C(src, num_pixels & 7, dst); // left-overs
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}
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#endif // !WORK_AROUND_GCC
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//------------------------------------------------------------------------------
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#ifdef USE_INTRINSICS
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static WEBP_INLINE uint32_t Average2(const uint32_t* const a,
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const uint32_t* const b) {
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const uint8x8_t a0 = vreinterpret_u8_u64(vcreate_u64(*a));
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const uint8x8_t b0 = vreinterpret_u8_u64(vcreate_u64(*b));
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const uint8x8_t avg = vhadd_u8(a0, b0);
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return vget_lane_u32(vreinterpret_u32_u8(avg), 0);
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}
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static WEBP_INLINE uint32_t Average3(const uint32_t* const a,
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const uint32_t* const b,
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const uint32_t* const c) {
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const uint8x8_t a0 = vreinterpret_u8_u64(vcreate_u64(*a));
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const uint8x8_t b0 = vreinterpret_u8_u64(vcreate_u64(*b));
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const uint8x8_t c0 = vreinterpret_u8_u64(vcreate_u64(*c));
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const uint8x8_t avg1 = vhadd_u8(a0, c0);
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const uint8x8_t avg2 = vhadd_u8(avg1, b0);
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return vget_lane_u32(vreinterpret_u32_u8(avg2), 0);
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}
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static WEBP_INLINE uint32_t Average4(const uint32_t* const a,
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const uint32_t* const b,
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const uint32_t* const c,
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const uint32_t* const d) {
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const uint8x8_t a0 = vreinterpret_u8_u64(vcreate_u64(*a));
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const uint8x8_t b0 = vreinterpret_u8_u64(vcreate_u64(*b));
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const uint8x8_t c0 = vreinterpret_u8_u64(vcreate_u64(*c));
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const uint8x8_t d0 = vreinterpret_u8_u64(vcreate_u64(*d));
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const uint8x8_t avg1 = vhadd_u8(a0, b0);
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const uint8x8_t avg2 = vhadd_u8(c0, d0);
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const uint8x8_t avg3 = vhadd_u8(avg1, avg2);
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return vget_lane_u32(vreinterpret_u32_u8(avg3), 0);
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}
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static uint32_t Predictor5(uint32_t left, const uint32_t* const top) {
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return Average3(&left, top + 0, top + 1);
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}
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static uint32_t Predictor6(uint32_t left, const uint32_t* const top) {
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return Average2(&left, top - 1);
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}
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static uint32_t Predictor7(uint32_t left, const uint32_t* const top) {
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return Average2(&left, top + 0);
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}
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static uint32_t Predictor8(uint32_t left, const uint32_t* const top) {
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(void)left;
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return Average2(top - 1, top + 0);
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}
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static uint32_t Predictor9(uint32_t left, const uint32_t* const top) {
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(void)left;
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return Average2(top + 0, top + 1);
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}
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static uint32_t Predictor10(uint32_t left, const uint32_t* const top) {
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return Average4(&left, top - 1, top + 0, top + 1);
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}
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//------------------------------------------------------------------------------
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static WEBP_INLINE uint32_t Select(const uint32_t* const c0,
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const uint32_t* const c1,
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const uint32_t* const c2) {
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const uint8x8_t p0 = vreinterpret_u8_u64(vcreate_u64(*c0));
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const uint8x8_t p1 = vreinterpret_u8_u64(vcreate_u64(*c1));
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const uint8x8_t p2 = vreinterpret_u8_u64(vcreate_u64(*c2));
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const uint8x8_t bc = vabd_u8(p1, p2); // |b-c|
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const uint8x8_t ac = vabd_u8(p0, p2); // |a-c|
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const int16x4_t sum_bc = vreinterpret_s16_u16(vpaddl_u8(bc));
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const int16x4_t sum_ac = vreinterpret_s16_u16(vpaddl_u8(ac));
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const int32x2_t diff = vpaddl_s16(vsub_s16(sum_bc, sum_ac));
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const int32_t pa_minus_pb = vget_lane_s32(diff, 0);
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return (pa_minus_pb <= 0) ? *c0 : *c1;
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}
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static uint32_t Predictor11(uint32_t left, const uint32_t* const top) {
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return Select(top + 0, &left, top - 1);
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}
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static WEBP_INLINE uint32_t ClampedAddSubtractFull(const uint32_t* const c0,
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const uint32_t* const c1,
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const uint32_t* const c2) {
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const uint8x8_t p0 = vreinterpret_u8_u64(vcreate_u64(*c0));
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const uint8x8_t p1 = vreinterpret_u8_u64(vcreate_u64(*c1));
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const uint8x8_t p2 = vreinterpret_u8_u64(vcreate_u64(*c2));
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const uint16x8_t sum0 = vaddl_u8(p0, p1); // add and widen
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const uint16x8_t sum1 = vqsubq_u16(sum0, vmovl_u8(p2)); // widen and subtract
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const uint8x8_t out = vqmovn_u16(sum1); // narrow and clamp
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return vget_lane_u32(vreinterpret_u32_u8(out), 0);
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}
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static uint32_t Predictor12(uint32_t left, const uint32_t* const top) {
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return ClampedAddSubtractFull(&left, top + 0, top - 1);
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}
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static WEBP_INLINE uint32_t ClampedAddSubtractHalf(const uint32_t* const c0,
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const uint32_t* const c1,
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const uint32_t* const c2) {
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const uint8x8_t p0 = vreinterpret_u8_u64(vcreate_u64(*c0));
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const uint8x8_t p1 = vreinterpret_u8_u64(vcreate_u64(*c1));
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const uint8x8_t p2 = vreinterpret_u8_u64(vcreate_u64(*c2));
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const uint8x8_t avg = vhadd_u8(p0, p1); // Average(c0,c1)
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const uint8x8_t ab = vshr_n_u8(vqsub_u8(avg, p2), 1); // (a-b)>>1 saturated
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const uint8x8_t ba = vshr_n_u8(vqsub_u8(p2, avg), 1); // (b-a)>>1 saturated
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const uint8x8_t out = vqsub_u8(vqadd_u8(avg, ab), ba);
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return vget_lane_u32(vreinterpret_u32_u8(out), 0);
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}
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static uint32_t Predictor13(uint32_t left, const uint32_t* const top) {
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return ClampedAddSubtractHalf(&left, top + 0, top - 1);
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}
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//------------------------------------------------------------------------------
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// Subtract-Green Transform
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// vtbl? are unavailable in iOS/arm64 builds.
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#if !defined(__aarch64__)
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// 255 = byte will be zero'd
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static const uint8_t kGreenShuffle[8] = { 1, 255, 1, 255, 5, 255, 5, 255 };
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static void SubtractGreenFromBlueAndRed(uint32_t* argb_data, int num_pixels) {
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const uint32_t* const end = argb_data + (num_pixels & ~3);
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const uint8x8_t shuffle = vld1_u8(kGreenShuffle);
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for (; argb_data < end; argb_data += 4) {
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const uint8x16_t argb = vld1q_u8((uint8_t*)argb_data);
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const uint8x16_t greens =
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vcombine_u8(vtbl1_u8(vget_low_u8(argb), shuffle),
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vtbl1_u8(vget_high_u8(argb), shuffle));
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vst1q_u8((uint8_t*)argb_data, vsubq_u8(argb, greens));
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}
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// fallthrough and finish off with plain-C
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VP8LSubtractGreenFromBlueAndRed_C(argb_data, num_pixels & 3);
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}
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static void AddGreenToBlueAndRed(uint32_t* argb_data, int num_pixels) {
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const uint32_t* const end = argb_data + (num_pixels & ~3);
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const uint8x8_t shuffle = vld1_u8(kGreenShuffle);
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for (; argb_data < end; argb_data += 4) {
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const uint8x16_t argb = vld1q_u8((uint8_t*)argb_data);
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const uint8x16_t greens =
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vcombine_u8(vtbl1_u8(vget_low_u8(argb), shuffle),
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vtbl1_u8(vget_high_u8(argb), shuffle));
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vst1q_u8((uint8_t*)argb_data, vaddq_u8(argb, greens));
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}
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// fallthrough and finish off with plain-C
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VP8LAddGreenToBlueAndRed_C(argb_data, num_pixels & 3);
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}
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#endif // !__aarch64__
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#endif // USE_INTRINSICS
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#endif // WEBP_USE_NEON
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//------------------------------------------------------------------------------
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extern void VP8LDspInitNEON(void);
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void VP8LDspInitNEON(void) {
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#if defined(WEBP_USE_NEON)
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VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA;
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VP8LConvertBGRAToBGR = ConvertBGRAToBGR;
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VP8LConvertBGRAToRGB = ConvertBGRAToRGB;
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#ifdef USE_INTRINSICS
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VP8LPredictors[5] = Predictor5;
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VP8LPredictors[6] = Predictor6;
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VP8LPredictors[7] = Predictor7;
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VP8LPredictors[8] = Predictor8;
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VP8LPredictors[9] = Predictor9;
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VP8LPredictors[10] = Predictor10;
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VP8LPredictors[11] = Predictor11;
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VP8LPredictors[12] = Predictor12;
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VP8LPredictors[13] = Predictor13;
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#if !defined(__aarch64__)
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VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed;
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VP8LAddGreenToBlueAndRed = AddGreenToBlueAndRed;
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#endif
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#endif
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#endif // WEBP_USE_NEON
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}
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//------------------------------------------------------------------------------
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