144 lines
5.0 KiB
C
144 lines
5.0 KiB
C
// Copyright 2015 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 encoder
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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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// Subtract-Green Transform
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// vtbl?_u8 are marked unavailable for iOS arm64 with Xcode < 6.3, use
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// non-standard versions there.
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#if defined(__APPLE__) && defined(__aarch64__) && \
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defined(__apple_build_version__) && (__apple_build_version__< 6020037)
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#define USE_VTBLQ
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#endif
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#ifdef USE_VTBLQ
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// 255 = byte will be zeroed
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static const uint8_t kGreenShuffle[16] = {
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1, 255, 1, 255, 5, 255, 5, 255, 9, 255, 9, 255, 13, 255, 13, 255
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};
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static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
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const uint8x16_t shuffle) {
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return vcombine_u8(vtbl1q_u8(argb, vget_low_u8(shuffle)),
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vtbl1q_u8(argb, vget_high_u8(shuffle)));
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}
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#else // !USE_VTBLQ
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// 255 = byte will be zeroed
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static const uint8_t kGreenShuffle[8] = { 1, 255, 1, 255, 5, 255, 5, 255 };
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static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
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const uint8x8_t shuffle) {
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return vcombine_u8(vtbl1_u8(vget_low_u8(argb), shuffle),
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vtbl1_u8(vget_high_u8(argb), shuffle));
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}
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#endif // USE_VTBLQ
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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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#ifdef USE_VTBLQ
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const uint8x16_t shuffle = vld1q_u8(kGreenShuffle);
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#else
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const uint8x8_t shuffle = vld1_u8(kGreenShuffle);
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#endif
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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 = DoGreenShuffle(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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//------------------------------------------------------------------------------
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// Color Transform
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static void TransformColor(const VP8LMultipliers* const m,
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uint32_t* argb_data, int num_pixels) {
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// sign-extended multiplying constants, pre-shifted by 6.
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#define CST(X) (((int16_t)(m->X << 8)) >> 6)
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const int16_t rb[8] = {
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CST(green_to_blue_), CST(green_to_red_),
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CST(green_to_blue_), CST(green_to_red_),
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CST(green_to_blue_), CST(green_to_red_),
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CST(green_to_blue_), CST(green_to_red_)
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};
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const int16x8_t mults_rb = vld1q_s16(rb);
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const int16_t b2[8] = {
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0, CST(red_to_blue_), 0, CST(red_to_blue_),
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0, CST(red_to_blue_), 0, CST(red_to_blue_),
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};
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const int16x8_t mults_b2 = vld1q_s16(b2);
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#undef CST
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#ifdef USE_VTBLQ
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static const uint8_t kg0g0[16] = {
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255, 1, 255, 1, 255, 5, 255, 5, 255, 9, 255, 9, 255, 13, 255, 13
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};
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const uint8x16_t shuffle = vld1q_u8(kg0g0);
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#else
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static const uint8_t k0g0g[8] = { 255, 1, 255, 1, 255, 5, 255, 5 };
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const uint8x8_t shuffle = vld1_u8(k0g0g);
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#endif
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const uint32x4_t mask_rb = vdupq_n_u32(0x00ff00ffu); // red-blue masks
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int i;
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for (i = 0; i + 4 <= num_pixels; i += 4) {
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const uint8x16_t in = vld1q_u8((uint8_t*)(argb_data + i));
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// 0 g 0 g
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const uint8x16_t greens = DoGreenShuffle(in, shuffle);
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// x dr x db1
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const int16x8_t A = vqdmulhq_s16(vreinterpretq_s16_u8(greens), mults_rb);
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// r 0 b 0
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const int16x8_t B = vshlq_n_s16(vreinterpretq_s16_u8(in), 8);
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// x db2 0 0
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const int16x8_t C = vqdmulhq_s16(B, mults_b2);
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// 0 0 x db2
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const uint32x4_t D = vshrq_n_u32(vreinterpretq_u32_s16(C), 16);
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// x dr x db
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const int8x16_t E = vaddq_s8(vreinterpretq_s8_u32(D),
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vreinterpretq_s8_s16(A));
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// 0 dr 0 db
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const uint32x4_t F = vandq_u32(vreinterpretq_u32_s8(E), mask_rb);
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const int8x16_t out = vsubq_s8(vreinterpretq_s8_u8(in),
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vreinterpretq_s8_u32(F));
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vst1q_s8((int8_t*)(argb_data + i), out);
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}
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// fallthrough and finish off with plain-C
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VP8LTransformColor_C(m, argb_data + i, num_pixels - i);
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}
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#undef USE_VTBLQ
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//------------------------------------------------------------------------------
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// Entry point
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extern void VP8LEncDspInitNEON(void);
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WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitNEON(void) {
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VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed;
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VP8LTransformColor = TransformColor;
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}
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#else // !WEBP_USE_NEON
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WEBP_DSP_INIT_STUB(VP8LEncDspInitNEON)
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#endif // WEBP_USE_NEON
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