| // Copyright 2017 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. |
| // ----------------------------------------------------------------------------- |
| // |
| // WebAssembly (WASM) version of some decoding functions. |
| // |
| // Based on dec_sse2.c |
| |
| #include "./dsp.h" |
| #include "../dec/vp8i_dec.h" |
| |
| #if defined(WEBP_USE_WASM) |
| |
| typedef int32_t int32x4 __attribute__((__vector_size__(16))); |
| typedef uint32_t uint32x4 __attribute__((__vector_size__(16))); |
| typedef int16_t int16x8 __attribute__((__vector_size__(16))); |
| typedef uint16_t uint16x8 __attribute__((__vector_size__(16))); |
| typedef int8_t int8x16 __attribute__((__vector_size__(16))); |
| typedef uint8_t uint8x16 __attribute__((__vector_size__(16))); |
| |
| //------------------------------------------------------------------------------ |
| // |
| |
| static WEBP_INLINE uint8x16 get_16_bytes(uint8_t* dst) { |
| uint8x16 a; |
| memcpy(&a, dst, 16); |
| return a; |
| } |
| |
| static WEBP_INLINE uint8x16 splat_uint8(uint32_t val) { |
| uint8x16 a; |
| a[0] = val; |
| a = (uint8x16)__builtin_shufflevector( |
| a, a, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0); |
| return a; |
| } |
| |
| //------------------------------------------------------------------------------ |
| // Luma 16x16 |
| |
| static WEBP_INLINE void Put16(uint8_t v, uint8_t* dst) { |
| int j; |
| const uint8x16 values = splat_uint8(v); |
| for (j = 0; j < 16; ++j) { |
| memcpy(dst, &values, 16); |
| dst += BPS; |
| } |
| } |
| |
| static void VE16(uint8_t* dst) { |
| const uint8x16 top = get_16_bytes(dst - BPS); |
| int j; |
| for (j = 0; j < 16; ++j) { |
| memcpy(dst + j * BPS, &top, 16); |
| } |
| } |
| |
| static void HE16(uint8_t* dst) { // horizontal |
| int j; |
| for (j = 16; j > 0; --j) { |
| const uint8x16 values = splat_uint8(dst[-1]); |
| memcpy(dst, &values, 16); |
| dst += BPS; |
| } |
| } |
| |
| static WEBP_INLINE uint32_t add_horizontal_16(uint8_t* dst) { |
| const uint8x16 zero = (uint8x16){0}; |
| const uint8x16 a = get_16_bytes(dst); |
| const uint16x8 _a_lbw = (uint16x8)__builtin_shufflevector( |
| a, zero, 0, 16, 1, 16, 2, 16, 3, 16, 4, 16, 5, 16, 6, 16, 7, 16); |
| const uint16x8 _a_hbw = (uint16x8)__builtin_shufflevector( |
| a, zero, 8, 16, 9, 16, 10, 16, 11, 16, 12, 16, 13, 16, 14, 16, 15, 16); |
| const uint16x8 sum_a = _a_lbw + _a_hbw; |
| const uint16x8 sum_b = (uint16x8)__builtin_shufflevector( |
| sum_a, sum_a, 4, 5, 6, 7, 4, 5, 6, 7); |
| const uint16x8 sum_c = sum_a + sum_b; |
| const uint16x8 sum_d = (uint16x8)__builtin_shufflevector( |
| sum_c, sum_c, 2, 3, 2, 3, 2, 3, 2, 3); |
| const uint16x8 sum_e = sum_c + sum_d; |
| const uint16x8 sum_f = (uint16x8)__builtin_shufflevector( |
| sum_e, sum_e, 1, 1, 1, 1, 1, 1, 1, 1); |
| const uint16x8 sum_g = sum_e + sum_f; |
| return sum_g[0] & 0xffff; |
| } |
| |
| static void DC16(uint8_t* dst) { // DC |
| const uint32_t sum = add_horizontal_16(dst - BPS); |
| int left = 0; |
| int j; |
| for (j = 0; j < 16; ++j) { |
| left += dst[-1 + j * BPS]; |
| } |
| { |
| const int DC = sum + left + 16; |
| Put16(DC >> 5, dst); |
| } |
| } |
| |
| static void DC16NoTop(uint8_t* dst) { // DC with top samples not available |
| int DC = 8; |
| int j; |
| for (j = 0; j < 16; ++j) { |
| DC += dst[-1 + j * BPS]; |
| } |
| Put16(DC >> 4, dst); |
| } |
| |
| static void DC16NoLeft(uint8_t* dst) { // DC with left samples not available |
| const int DC = 8 + add_horizontal_16(dst - BPS); |
| Put16(DC >> 4, dst); |
| } |
| |
| static void DC16NoTopLeft(uint8_t* dst) { // DC with no top and left samples |
| Put16(0x80, dst); |
| } |
| |
| //------------------------------------------------------------------------------ |
| // Entry point |
| |
| extern void VP8DspInitWASM(void); |
| |
| WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitWASM(void) { |
| VP8PredLuma16[0] = DC16; |
| VP8PredLuma16[2] = VE16; |
| VP8PredLuma16[3] = HE16; |
| VP8PredLuma16[4] = DC16NoTop; |
| VP8PredLuma16[5] = DC16NoLeft; |
| VP8PredLuma16[6] = DC16NoTopLeft; |
| } |
| |
| #else // !WEBP_USE_WASM |
| |
| WEBP_DSP_INIT_STUB(VP8DspInitWASM) |
| |
| #endif // WEBP_USE_WASM |