mirror of
https://github.com/webmproject/libwebp.git
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270 lines
9.4 KiB
C
270 lines
9.4 KiB
C
// Copyright 2014 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 decoder
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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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// Colorspace conversion functions
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#if !defined(WORK_AROUND_GCC)
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// gcc 4.6.0 had some trouble (NDK-r9) with this code. We only use it for
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// gcc-4.8.x at least.
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static void ConvertBGRAToRGBA(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~15);
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for (; src < end; src += 16) {
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uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
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// swap B and R. (VSWP d0,d2 has no intrinsics equivalent!)
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const uint8x16_t tmp = pixel.val[0];
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pixel.val[0] = pixel.val[2];
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pixel.val[2] = tmp;
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vst4q_u8(dst, pixel);
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dst += 64;
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}
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VP8LConvertBGRAToRGBA_C(src, num_pixels & 15, dst); // left-overs
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}
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static void ConvertBGRAToBGR(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~15);
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for (; src < end; src += 16) {
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const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
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const uint8x16x3_t tmp = { { pixel.val[0], pixel.val[1], pixel.val[2] } };
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vst3q_u8(dst, tmp);
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dst += 48;
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}
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VP8LConvertBGRAToBGR_C(src, num_pixels & 15, dst); // left-overs
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}
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static void ConvertBGRAToRGB(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~15);
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for (; src < end; src += 16) {
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const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
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const uint8x16x3_t tmp = { { pixel.val[2], pixel.val[1], pixel.val[0] } };
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vst3q_u8(dst, tmp);
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dst += 48;
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}
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VP8LConvertBGRAToRGB_C(src, num_pixels & 15, dst); // left-overs
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}
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#else // WORK_AROUND_GCC
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// gcc-4.6.0 fallback
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static const uint8_t kRGBAShuffle[8] = { 2, 1, 0, 3, 6, 5, 4, 7 };
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static void ConvertBGRAToRGBA(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~1);
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const uint8x8_t shuffle = vld1_u8(kRGBAShuffle);
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for (; src < end; src += 2) {
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const uint8x8_t pixels = vld1_u8((uint8_t*)src);
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vst1_u8(dst, vtbl1_u8(pixels, shuffle));
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dst += 8;
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}
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VP8LConvertBGRAToRGBA_C(src, num_pixels & 1, dst); // left-overs
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}
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static const uint8_t kBGRShuffle[3][8] = {
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{ 0, 1, 2, 4, 5, 6, 8, 9 },
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{ 10, 12, 13, 14, 16, 17, 18, 20 },
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{ 21, 22, 24, 25, 26, 28, 29, 30 }
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};
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static void ConvertBGRAToBGR(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~7);
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const uint8x8_t shuffle0 = vld1_u8(kBGRShuffle[0]);
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const uint8x8_t shuffle1 = vld1_u8(kBGRShuffle[1]);
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const uint8x8_t shuffle2 = vld1_u8(kBGRShuffle[2]);
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for (; src < end; src += 8) {
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uint8x8x4_t pixels;
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INIT_VECTOR4(pixels,
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vld1_u8((const uint8_t*)(src + 0)),
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vld1_u8((const uint8_t*)(src + 2)),
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vld1_u8((const uint8_t*)(src + 4)),
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vld1_u8((const uint8_t*)(src + 6)));
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vst1_u8(dst + 0, vtbl4_u8(pixels, shuffle0));
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vst1_u8(dst + 8, vtbl4_u8(pixels, shuffle1));
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vst1_u8(dst + 16, vtbl4_u8(pixels, shuffle2));
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dst += 8 * 3;
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}
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VP8LConvertBGRAToBGR_C(src, num_pixels & 7, dst); // left-overs
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}
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static const uint8_t kRGBShuffle[3][8] = {
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{ 2, 1, 0, 6, 5, 4, 10, 9 },
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{ 8, 14, 13, 12, 18, 17, 16, 22 },
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{ 21, 20, 26, 25, 24, 30, 29, 28 }
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};
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static void ConvertBGRAToRGB(const uint32_t* src,
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int num_pixels, uint8_t* dst) {
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const uint32_t* const end = src + (num_pixels & ~7);
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const uint8x8_t shuffle0 = vld1_u8(kRGBShuffle[0]);
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const uint8x8_t shuffle1 = vld1_u8(kRGBShuffle[1]);
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const uint8x8_t shuffle2 = vld1_u8(kRGBShuffle[2]);
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for (; src < end; src += 8) {
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uint8x8x4_t pixels;
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INIT_VECTOR4(pixels,
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vld1_u8((const uint8_t*)(src + 0)),
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vld1_u8((const uint8_t*)(src + 2)),
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vld1_u8((const uint8_t*)(src + 4)),
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vld1_u8((const uint8_t*)(src + 6)));
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vst1_u8(dst + 0, vtbl4_u8(pixels, shuffle0));
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vst1_u8(dst + 8, vtbl4_u8(pixels, shuffle1));
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vst1_u8(dst + 16, vtbl4_u8(pixels, shuffle2));
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dst += 8 * 3;
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}
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VP8LConvertBGRAToRGB_C(src, num_pixels & 7, dst); // left-overs
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}
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#endif // !WORK_AROUND_GCC
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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 AddGreenToBlueAndRed(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, vaddq_u8(argb, greens));
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}
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// fallthrough and finish off with plain-C
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VP8LAddGreenToBlueAndRed_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 TransformColorInverse(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_ag = vdupq_n_u32(0xff00ff00u);
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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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const uint32x4_t a0g0 = vandq_u32(vreinterpretq_u32_u8(in), mask_ag);
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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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// x r' x b'
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const int8x16_t B = vaddq_s8(vreinterpretq_s8_u8(in),
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vreinterpretq_s8_s16(A));
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// r' 0 b' 0
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const int16x8_t C = vshlq_n_s16(vreinterpretq_s16_s8(B), 8);
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// x db2 0 0
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const int16x8_t D = vqdmulhq_s16(C, mults_b2);
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// 0 x db2 0
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const uint32x4_t E = vshrq_n_u32(vreinterpretq_u32_s16(D), 8);
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// r' x b'' 0
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const int8x16_t F = vaddq_s8(vreinterpretq_s8_u32(E),
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vreinterpretq_s8_s16(C));
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// 0 r' 0 b''
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const uint16x8_t G = vshrq_n_u16(vreinterpretq_u16_s8(F), 8);
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const uint32x4_t out = vorrq_u32(vreinterpretq_u32_u16(G), a0g0);
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vst1q_u32(argb_data + i, out);
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}
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// Fall-back to C-version for left-overs.
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VP8LTransformColorInverse_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 VP8LDspInitNEON(void);
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WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitNEON(void) {
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VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA;
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VP8LConvertBGRAToBGR = ConvertBGRAToBGR;
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VP8LConvertBGRAToRGB = ConvertBGRAToRGB;
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VP8LAddGreenToBlueAndRed = AddGreenToBlueAndRed;
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VP8LTransformColorInverse = TransformColorInverse;
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}
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#else // !WEBP_USE_NEON
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WEBP_DSP_INIT_STUB(VP8LDspInitNEON)
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#endif // WEBP_USE_NEON
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