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// Copyright 2014 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 variant of methods for lossless decoder
//
// Author: Skal (pascal.massimino@gmail.com)
#include "./dsp.h"
#if defined(WEBP_USE_NEON)
#include <arm_neon.h>
#include "./lossless.h"
#include "./neon.h"
//------------------------------------------------------------------------------
// Colorspace conversion functions
#if !defined(WORK_AROUND_GCC)
// gcc 4.6.0 had some trouble (NDK-r9) with this code. We only use it for
// gcc-4.8.x at least.
static void ConvertBGRAToRGBA(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~15);
for (; src < end; src += 16) {
uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
// swap B and R. (VSWP d0,d2 has no intrinsics equivalent!)
const uint8x16_t tmp = pixel.val[0];
pixel.val[0] = pixel.val[2];
pixel.val[2] = tmp;
vst4q_u8(dst, pixel);
dst += 64;
}
VP8LConvertBGRAToRGBA_C(src, num_pixels & 15, dst); // left-overs
}
static void ConvertBGRAToBGR(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~15);
for (; src < end; src += 16) {
const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
const uint8x16x3_t tmp = { { pixel.val[0], pixel.val[1], pixel.val[2] } };
vst3q_u8(dst, tmp);
dst += 48;
}
VP8LConvertBGRAToBGR_C(src, num_pixels & 15, dst); // left-overs
}
static void ConvertBGRAToRGB(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~15);
for (; src < end; src += 16) {
const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
const uint8x16x3_t tmp = { { pixel.val[2], pixel.val[1], pixel.val[0] } };
vst3q_u8(dst, tmp);
dst += 48;
}
VP8LConvertBGRAToRGB_C(src, num_pixels & 15, dst); // left-overs
}
#else // WORK_AROUND_GCC
// gcc-4.6.0 fallback
static const uint8_t kRGBAShuffle[8] = { 2, 1, 0, 3, 6, 5, 4, 7 };
static void ConvertBGRAToRGBA(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~1);
const uint8x8_t shuffle = vld1_u8(kRGBAShuffle);
for (; src < end; src += 2) {
const uint8x8_t pixels = vld1_u8((uint8_t*)src);
vst1_u8(dst, vtbl1_u8(pixels, shuffle));
dst += 8;
}
VP8LConvertBGRAToRGBA_C(src, num_pixels & 1, dst); // left-overs
}
static const uint8_t kBGRShuffle[3][8] = {
{ 0, 1, 2, 4, 5, 6, 8, 9 },
{ 10, 12, 13, 14, 16, 17, 18, 20 },
{ 21, 22, 24, 25, 26, 28, 29, 30 }
};
static void ConvertBGRAToBGR(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~7);
const uint8x8_t shuffle0 = vld1_u8(kBGRShuffle[0]);
const uint8x8_t shuffle1 = vld1_u8(kBGRShuffle[1]);
const uint8x8_t shuffle2 = vld1_u8(kBGRShuffle[2]);
for (; src < end; src += 8) {
uint8x8x4_t pixels;
INIT_VECTOR4(pixels,
vld1_u8((const uint8_t*)(src + 0)),
vld1_u8((const uint8_t*)(src + 2)),
vld1_u8((const uint8_t*)(src + 4)),
vld1_u8((const uint8_t*)(src + 6)));
vst1_u8(dst + 0, vtbl4_u8(pixels, shuffle0));
vst1_u8(dst + 8, vtbl4_u8(pixels, shuffle1));
vst1_u8(dst + 16, vtbl4_u8(pixels, shuffle2));
dst += 8 * 3;
}
VP8LConvertBGRAToBGR_C(src, num_pixels & 7, dst); // left-overs
}
static const uint8_t kRGBShuffle[3][8] = {
{ 2, 1, 0, 6, 5, 4, 10, 9 },
{ 8, 14, 13, 12, 18, 17, 16, 22 },
{ 21, 20, 26, 25, 24, 30, 29, 28 }
};
static void ConvertBGRAToRGB(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~7);
const uint8x8_t shuffle0 = vld1_u8(kRGBShuffle[0]);
const uint8x8_t shuffle1 = vld1_u8(kRGBShuffle[1]);
const uint8x8_t shuffle2 = vld1_u8(kRGBShuffle[2]);
for (; src < end; src += 8) {
uint8x8x4_t pixels;
INIT_VECTOR4(pixels,
vld1_u8((const uint8_t*)(src + 0)),
vld1_u8((const uint8_t*)(src + 2)),
vld1_u8((const uint8_t*)(src + 4)),
vld1_u8((const uint8_t*)(src + 6)));
vst1_u8(dst + 0, vtbl4_u8(pixels, shuffle0));
vst1_u8(dst + 8, vtbl4_u8(pixels, shuffle1));
vst1_u8(dst + 16, vtbl4_u8(pixels, shuffle2));
dst += 8 * 3;
}
VP8LConvertBGRAToRGB_C(src, num_pixels & 7, dst); // left-overs
}
#endif // !WORK_AROUND_GCC
//------------------------------------------------------------------------------
// Subtract-Green Transform
// vtbl?_u8 are marked unavailable for iOS arm64 with Xcode < 6.3, use
// non-standard versions there.
#if defined(__APPLE__) && defined(__aarch64__) && \
defined(__apple_build_version__) && (__apple_build_version__< 6020037)
#define USE_VTBLQ
#endif
#ifdef USE_VTBLQ
// 255 = byte will be zeroed
static const uint8_t kGreenShuffle[16] = {
1, 255, 1, 255, 5, 255, 5, 255, 9, 255, 9, 255, 13, 255, 13, 255
};
static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
const uint8x16_t shuffle) {
return vcombine_u8(vtbl1q_u8(argb, vget_low_u8(shuffle)),
vtbl1q_u8(argb, vget_high_u8(shuffle)));
}
#else // !USE_VTBLQ
// 255 = byte will be zeroed
static const uint8_t kGreenShuffle[8] = { 1, 255, 1, 255, 5, 255, 5, 255 };
static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
const uint8x8_t shuffle) {
return vcombine_u8(vtbl1_u8(vget_low_u8(argb), shuffle),
vtbl1_u8(vget_high_u8(argb), shuffle));
}
#endif // USE_VTBLQ
static void AddGreenToBlueAndRed(uint32_t* argb_data, int num_pixels) {
const uint32_t* const end = argb_data + (num_pixels & ~3);
#ifdef USE_VTBLQ
const uint8x16_t shuffle = vld1q_u8(kGreenShuffle);
#else
const uint8x8_t shuffle = vld1_u8(kGreenShuffle);
#endif
for (; argb_data < end; argb_data += 4) {
const uint8x16_t argb = vld1q_u8((uint8_t*)argb_data);
const uint8x16_t greens = DoGreenShuffle(argb, shuffle);
vst1q_u8((uint8_t*)argb_data, vaddq_u8(argb, greens));
}
// fallthrough and finish off with plain-C
VP8LAddGreenToBlueAndRed_C(argb_data, num_pixels & 3);
}
//------------------------------------------------------------------------------
// Color Transform
static void TransformColorInverse(const VP8LMultipliers* const m,
uint32_t* argb_data, int num_pixels) {
// sign-extended multiplying constants, pre-shifted by 6.
#define CST(X) (((int16_t)(m->X << 8)) >> 6)
const int16_t rb[8] = {
CST(green_to_blue_), CST(green_to_red_),
CST(green_to_blue_), CST(green_to_red_),
CST(green_to_blue_), CST(green_to_red_),
CST(green_to_blue_), CST(green_to_red_)
};
const int16x8_t mults_rb = vld1q_s16(rb);
const int16_t b2[8] = {
0, CST(red_to_blue_), 0, CST(red_to_blue_),
0, CST(red_to_blue_), 0, CST(red_to_blue_),
};
const int16x8_t mults_b2 = vld1q_s16(b2);
#undef CST
#ifdef USE_VTBLQ
static const uint8_t kg0g0[16] = {
255, 1, 255, 1, 255, 5, 255, 5, 255, 9, 255, 9, 255, 13, 255, 13
};
const uint8x16_t shuffle = vld1q_u8(kg0g0);
#else
static const uint8_t k0g0g[8] = { 255, 1, 255, 1, 255, 5, 255, 5 };
const uint8x8_t shuffle = vld1_u8(k0g0g);
#endif
const uint32x4_t mask_ag = vdupq_n_u32(0xff00ff00u);
int i;
for (i = 0; i + 4 <= num_pixels; i += 4) {
const uint8x16_t in = vld1q_u8((uint8_t*)(argb_data + i));
const uint32x4_t a0g0 = vandq_u32(vreinterpretq_u32_u8(in), mask_ag);
// 0 g 0 g
const uint8x16_t greens = DoGreenShuffle(in, shuffle);
// x dr x db1
const int16x8_t A = vqdmulhq_s16(vreinterpretq_s16_u8(greens), mults_rb);
// x r' x b'
const int8x16_t B = vaddq_s8(vreinterpretq_s8_u8(in),
vreinterpretq_s8_s16(A));
// r' 0 b' 0
const int16x8_t C = vshlq_n_s16(vreinterpretq_s16_s8(B), 8);
// x db2 0 0
const int16x8_t D = vqdmulhq_s16(C, mults_b2);
// 0 x db2 0
const uint32x4_t E = vshrq_n_u32(vreinterpretq_u32_s16(D), 8);
// r' x b'' 0
const int8x16_t F = vaddq_s8(vreinterpretq_s8_u32(E),
vreinterpretq_s8_s16(C));
// 0 r' 0 b''
const uint16x8_t G = vshrq_n_u16(vreinterpretq_u16_s8(F), 8);
const uint32x4_t out = vorrq_u32(vreinterpretq_u32_u16(G), a0g0);
vst1q_u32(argb_data + i, out);
}
// Fall-back to C-version for left-overs.
VP8LTransformColorInverse_C(m, argb_data + i, num_pixels - i);
}
#undef USE_VTBLQ
//------------------------------------------------------------------------------
// Entry point
extern void VP8LDspInitNEON(void);
WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitNEON(void) {
VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA;
VP8LConvertBGRAToBGR = ConvertBGRAToBGR;
VP8LConvertBGRAToRGB = ConvertBGRAToRGB;
VP8LAddGreenToBlueAndRed = AddGreenToBlueAndRed;
VP8LTransformColorInverse = TransformColorInverse;
}
#else // !WEBP_USE_NEON
WEBP_DSP_INIT_STUB(VP8LDspInitNEON)
#endif // WEBP_USE_NEON
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