mirror of
https://github.com/webmproject/libwebp.git
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195 lines
7.9 KiB
C
195 lines
7.9 KiB
C
// Copyright 2016 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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// SSE2 code common to several files.
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//
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// Author: Vincent Rabaud (vrabaud@google.com)
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#ifndef WEBP_DSP_COMMON_SSE2_H_
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#define WEBP_DSP_COMMON_SSE2_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(WEBP_USE_SSE2)
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#include <emmintrin.h>
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//------------------------------------------------------------------------------
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// Quite useful macro for debugging. Left here for convenience.
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#if 0
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#include <stdio.h>
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static WEBP_INLINE void PrintReg(const __m128i r, const char* const name,
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int size) {
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int n;
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union {
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__m128i r;
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uint8_t i8[16];
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uint16_t i16[8];
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uint32_t i32[4];
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uint64_t i64[2];
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} tmp;
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tmp.r = r;
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fprintf(stderr, "%s\t: ", name);
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if (size == 8) {
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for (n = 0; n < 16; ++n) fprintf(stderr, "%.2x ", tmp.i8[n]);
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} else if (size == 16) {
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for (n = 0; n < 8; ++n) fprintf(stderr, "%.4x ", tmp.i16[n]);
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} else if (size == 32) {
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for (n = 0; n < 4; ++n) fprintf(stderr, "%.8x ", tmp.i32[n]);
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} else {
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for (n = 0; n < 2; ++n) fprintf(stderr, "%.16lx ", tmp.i64[n]);
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}
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fprintf(stderr, "\n");
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}
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#endif
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//------------------------------------------------------------------------------
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// Math functions.
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// Return the sum of all the 8b in the register.
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static WEBP_INLINE int VP8HorizontalAdd8b(const __m128i* const a) {
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const __m128i zero = _mm_setzero_si128();
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const __m128i sad8x2 = _mm_sad_epu8(*a, zero);
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// sum the two sads: sad8x2[0:1] + sad8x2[8:9]
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const __m128i sum = _mm_add_epi32(sad8x2, _mm_shuffle_epi32(sad8x2, 2));
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return _mm_cvtsi128_si32(sum);
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}
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// Transpose two 4x4 16b matrices horizontally stored in registers.
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static WEBP_INLINE void VP8Transpose_2_4x4_16b(
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const __m128i* const in0, const __m128i* const in1,
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const __m128i* const in2, const __m128i* const in3, __m128i* const out0,
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__m128i* const out1, __m128i* const out2, __m128i* const out3) {
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// Transpose the two 4x4.
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// a00 a01 a02 a03 b00 b01 b02 b03
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// a10 a11 a12 a13 b10 b11 b12 b13
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// a20 a21 a22 a23 b20 b21 b22 b23
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// a30 a31 a32 a33 b30 b31 b32 b33
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const __m128i transpose0_0 = _mm_unpacklo_epi16(*in0, *in1);
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const __m128i transpose0_1 = _mm_unpacklo_epi16(*in2, *in3);
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const __m128i transpose0_2 = _mm_unpackhi_epi16(*in0, *in1);
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const __m128i transpose0_3 = _mm_unpackhi_epi16(*in2, *in3);
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// a00 a10 a01 a11 a02 a12 a03 a13
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// a20 a30 a21 a31 a22 a32 a23 a33
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// b00 b10 b01 b11 b02 b12 b03 b13
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// b20 b30 b21 b31 b22 b32 b23 b33
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const __m128i transpose1_0 = _mm_unpacklo_epi32(transpose0_0, transpose0_1);
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const __m128i transpose1_1 = _mm_unpacklo_epi32(transpose0_2, transpose0_3);
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const __m128i transpose1_2 = _mm_unpackhi_epi32(transpose0_0, transpose0_1);
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const __m128i transpose1_3 = _mm_unpackhi_epi32(transpose0_2, transpose0_3);
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// a00 a10 a20 a30 a01 a11 a21 a31
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// b00 b10 b20 b30 b01 b11 b21 b31
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// a02 a12 a22 a32 a03 a13 a23 a33
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// b02 b12 a22 b32 b03 b13 b23 b33
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*out0 = _mm_unpacklo_epi64(transpose1_0, transpose1_1);
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*out1 = _mm_unpackhi_epi64(transpose1_0, transpose1_1);
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*out2 = _mm_unpacklo_epi64(transpose1_2, transpose1_3);
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*out3 = _mm_unpackhi_epi64(transpose1_2, transpose1_3);
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// a00 a10 a20 a30 b00 b10 b20 b30
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// a01 a11 a21 a31 b01 b11 b21 b31
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// a02 a12 a22 a32 b02 b12 b22 b32
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// a03 a13 a23 a33 b03 b13 b23 b33
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}
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//------------------------------------------------------------------------------
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// Channel mixing.
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// Function used several times in VP8PlanarTo24b.
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// It samples the in buffer as follows: one every two unsigned char is stored
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// at the beginning of the buffer, while the other half is stored at the end.
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#define VP8PlanarTo24bHelper(IN, OUT) \
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do { \
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const __m128i v_mask = _mm_set1_epi16(0x00ff); \
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/* Take one every two upper 8b values.*/ \
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(OUT##0) = _mm_packus_epi16(_mm_and_si128((IN##0), v_mask), \
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_mm_and_si128((IN##1), v_mask)); \
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(OUT##1) = _mm_packus_epi16(_mm_and_si128((IN##2), v_mask), \
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_mm_and_si128((IN##3), v_mask)); \
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(OUT##2) = _mm_packus_epi16(_mm_and_si128((IN##4), v_mask), \
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_mm_and_si128((IN##5), v_mask)); \
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/* Take one every two lower 8b values.*/ \
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(OUT##3) = _mm_packus_epi16(_mm_srli_epi16((IN##0), 8), \
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_mm_srli_epi16((IN##1), 8)); \
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(OUT##4) = _mm_packus_epi16(_mm_srli_epi16((IN##2), 8), \
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_mm_srli_epi16((IN##3), 8)); \
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(OUT##5) = _mm_packus_epi16(_mm_srli_epi16((IN##4), 8), \
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_mm_srli_epi16((IN##5), 8)); \
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} while (0)
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// Pack the planar buffers
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// rrrr... rrrr... gggg... gggg... bbbb... bbbb....
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// triplet by triplet in the output buffer rgb as rgbrgbrgbrgb ...
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static WEBP_INLINE void VP8PlanarTo24b_SSE2(
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__m128i* const in0, __m128i* const in1, __m128i* const in2,
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__m128i* const in3, __m128i* const in4, __m128i* const in5) {
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// The input is 6 registers of sixteen 8b but for the sake of explanation,
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// let's take 6 registers of four 8b values.
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// To pack, we will keep taking one every two 8b integer and move it
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// around as follows:
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// Input:
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// r0r1r2r3 | r4r5r6r7 | g0g1g2g3 | g4g5g6g7 | b0b1b2b3 | b4b5b6b7
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// Split the 6 registers in two sets of 3 registers: the first set as the even
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// 8b bytes, the second the odd ones:
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// r0r2r4r6 | g0g2g4g6 | b0b2b4b6 | r1r3r5r7 | g1g3g5g7 | b1b3b5b7
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// Repeat the same permutations twice more:
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// r0r4g0g4 | b0b4r1r5 | g1g5b1b5 | r2r6g2g6 | b2b6r3r7 | g3g7b3b7
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// r0g0b0r1 | g1b1r2g2 | b2r3g3b3 | r4g4b4r5 | g5b5r6g6 | b6r7g7b7
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__m128i tmp0, tmp1, tmp2, tmp3, tmp4, tmp5;
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VP8PlanarTo24bHelper(*in, tmp);
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VP8PlanarTo24bHelper(tmp, *in);
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VP8PlanarTo24bHelper(*in, tmp);
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// We need to do it two more times than the example as we have sixteen bytes.
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{
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__m128i out0, out1, out2, out3, out4, out5;
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VP8PlanarTo24bHelper(tmp, out);
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VP8PlanarTo24bHelper(out, *in);
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}
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}
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#undef VP8PlanarTo24bHelper
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// Convert four packed four-channel buffers like argbargbargbargb... into the
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// split channels aaaaa ... rrrr ... gggg .... bbbbb ......
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static WEBP_INLINE void VP8L32bToPlanar_SSE2(__m128i* const in0,
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__m128i* const in1,
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__m128i* const in2,
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__m128i* const in3) {
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// Column-wise transpose.
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const __m128i A0 = _mm_unpacklo_epi8(*in0, *in1);
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const __m128i A1 = _mm_unpackhi_epi8(*in0, *in1);
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const __m128i A2 = _mm_unpacklo_epi8(*in2, *in3);
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const __m128i A3 = _mm_unpackhi_epi8(*in2, *in3);
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const __m128i B0 = _mm_unpacklo_epi8(A0, A1);
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const __m128i B1 = _mm_unpackhi_epi8(A0, A1);
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const __m128i B2 = _mm_unpacklo_epi8(A2, A3);
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const __m128i B3 = _mm_unpackhi_epi8(A2, A3);
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// C0 = g7 g6 ... g1 g0 | b7 b6 ... b1 b0
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// C1 = a7 a6 ... a1 a0 | r7 r6 ... r1 r0
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const __m128i C0 = _mm_unpacklo_epi8(B0, B1);
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const __m128i C1 = _mm_unpackhi_epi8(B0, B1);
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const __m128i C2 = _mm_unpacklo_epi8(B2, B3);
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const __m128i C3 = _mm_unpackhi_epi8(B2, B3);
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// Gather the channels.
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*in0 = _mm_unpackhi_epi64(C1, C3);
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*in1 = _mm_unpacklo_epi64(C1, C3);
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*in2 = _mm_unpackhi_epi64(C0, C2);
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*in3 = _mm_unpacklo_epi64(C0, C2);
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}
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#endif // WEBP_USE_SSE2
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // WEBP_DSP_COMMON_SSE2_H_
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