mirror of
https://github.com/webmproject/libwebp.git
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94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
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// 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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#ifdef WEBP_USE_INTRINSICS
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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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#undef USE_VTBLQ
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#endif // WEBP_USE_INTRINSICS
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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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#ifdef WEBP_USE_INTRINSICS
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VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed;
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#endif
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}
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#else // !WEBP_USE_NEON
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extern void VP8LEncDspInitNEON(void);
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WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitNEON(void) {}
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#endif // WEBP_USE_NEON
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