| // 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 |