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Diffstat (limited to 'src/dsp/upsampling_neon.c')
| -rw-r--r-- | src/dsp/upsampling_neon.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/src/dsp/upsampling_neon.c b/src/dsp/upsampling_neon.c new file mode 100644 index 00000000..00e2f892 --- /dev/null +++ b/src/dsp/upsampling_neon.c @@ -0,0 +1,292 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// This code is licensed under the same terms as WebM: +// Software License Agreement: http://www.webmproject.org/license/software/ +// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ +// ----------------------------------------------------------------------------- +// +// NEON version of YUV to RGB upsampling functions. +// +// Author: mans@mansr.com (Mans Rullgard) +// Based on SSE code by: somnath@google.com (Somnath Banerjee) + +#include "./dsp.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#if defined(WEBP_USE_NEON) + +#include <assert.h> +#include <arm_neon.h> +#include <string.h> +#include "./yuv.h" + +#ifdef FANCY_UPSAMPLING + +// Loads 9 pixels each from rows r1 and r2 and generates 16 pixels. +#define UPSAMPLE_16PIXELS(r1, r2, out) { \ + uint8x8_t a = vld1_u8(r1); \ + uint8x8_t b = vld1_u8(r1 + 1); \ + uint8x8_t c = vld1_u8(r2); \ + uint8x8_t d = vld1_u8(r2 + 1); \ + \ + uint16x8_t al = vshll_n_u8(a, 1); \ + uint16x8_t bl = vshll_n_u8(b, 1); \ + uint16x8_t cl = vshll_n_u8(c, 1); \ + uint16x8_t dl = vshll_n_u8(d, 1); \ + \ + uint8x8_t diag1, diag2; \ + uint16x8_t sl; \ + \ + /* a + b + c + d */ \ + sl = vaddl_u8(a, b); \ + sl = vaddw_u8(sl, c); \ + sl = vaddw_u8(sl, d); \ + \ + al = vaddq_u16(sl, al); /* 3a + b + c + d */ \ + bl = vaddq_u16(sl, bl); /* a + 3b + c + d */ \ + \ + al = vaddq_u16(al, dl); /* 3a + b + c + 3d */ \ + bl = vaddq_u16(bl, cl); /* a + 3b + 3c + d */ \ + \ + diag2 = vshrn_n_u16(al, 3); \ + diag1 = vshrn_n_u16(bl, 3); \ + \ + a = vrhadd_u8(a, diag1); \ + b = vrhadd_u8(b, diag2); \ + c = vrhadd_u8(c, diag2); \ + d = vrhadd_u8(d, diag1); \ + \ + { \ + const uint8x8x2_t a_b = {{ a, b }}; \ + const uint8x8x2_t c_d = {{ c, d }}; \ + vst2_u8(out, a_b); \ + vst2_u8(out + 32, c_d); \ + } \ +} + +// Turn the macro into a function for reducing code-size when non-critical +static void Upsample16Pixels(const uint8_t *r1, const uint8_t *r2, + uint8_t *out) { + UPSAMPLE_16PIXELS(r1, r2, out); +} + +#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \ + uint8_t r1[9], r2[9]; \ + memcpy(r1, (tb), (num_pixels)); \ + memcpy(r2, (bb), (num_pixels)); \ + /* replicate last byte */ \ + memset(r1 + (num_pixels), r1[(num_pixels) - 1], 9 - (num_pixels)); \ + memset(r2 + (num_pixels), r2[(num_pixels) - 1], 9 - (num_pixels)); \ + Upsample16Pixels(r1, r2, out); \ +} + +#define CY 76283 +#define CVR 89858 +#define CUG 22014 +#define CVG 45773 +#define CUB 113618 + +static const int16_t coef[4] = { CVR / 4, CUG, CVG / 2, CUB / 4 }; + +#define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) { \ + int i; \ + for (i = 0; i < N; i += 8) { \ + int off = ((cur_x) + i) * XSTEP; \ + uint8x8_t y = vld1_u8(src_y + (cur_x) + i); \ + uint8x8_t u = vld1_u8((src_uv) + i); \ + uint8x8_t v = vld1_u8((src_uv) + i + 16); \ + int16x8_t yy = vreinterpretq_s16_u16(vsubl_u8(y, u16)); \ + int16x8_t uu = vreinterpretq_s16_u16(vsubl_u8(u, u128)); \ + int16x8_t vv = vreinterpretq_s16_u16(vsubl_u8(v, u128)); \ + \ + int16x8_t ud = vshlq_n_s16(uu, 1); \ + int16x8_t vd = vshlq_n_s16(vv, 1); \ + \ + int32x4_t vrl = vqdmlal_lane_s16(vshll_n_s16(vget_low_s16(vv), 1), \ + vget_low_s16(vd), cf16, 0); \ + int32x4_t vrh = vqdmlal_lane_s16(vshll_n_s16(vget_high_s16(vv), 1), \ + vget_high_s16(vd), cf16, 0); \ + int16x8_t vr = vcombine_s16(vrshrn_n_s32(vrl, 16), \ + vrshrn_n_s32(vrh, 16)); \ + \ + int32x4_t vl = vmovl_s16(vget_low_s16(vv)); \ + int32x4_t vh = vmovl_s16(vget_high_s16(vv)); \ + int32x4_t ugl = vmlal_lane_s16(vl, vget_low_s16(uu), cf16, 1); \ + int32x4_t ugh = vmlal_lane_s16(vh, vget_high_s16(uu), cf16, 1); \ + int32x4_t gcl = vqdmlal_lane_s16(ugl, vget_low_s16(vv), cf16, 2); \ + int32x4_t gch = vqdmlal_lane_s16(ugh, vget_high_s16(vv), cf16, 2); \ + int16x8_t gc = vcombine_s16(vrshrn_n_s32(gcl, 16), \ + vrshrn_n_s32(gch, 16)); \ + \ + int32x4_t ubl = vqdmlal_lane_s16(vshll_n_s16(vget_low_s16(uu), 1), \ + vget_low_s16(ud), cf16, 3); \ + int32x4_t ubh = vqdmlal_lane_s16(vshll_n_s16(vget_high_s16(uu), 1), \ + vget_high_s16(ud), cf16, 3); \ + int16x8_t ub = vcombine_s16(vrshrn_n_s32(ubl, 16), \ + vrshrn_n_s32(ubh, 16)); \ + \ + int32x4_t rl = vaddl_s16(vget_low_s16(yy), vget_low_s16(vr)); \ + int32x4_t rh = vaddl_s16(vget_high_s16(yy), vget_high_s16(vr)); \ + int32x4_t gl = vsubl_s16(vget_low_s16(yy), vget_low_s16(gc)); \ + int32x4_t gh = vsubl_s16(vget_high_s16(yy), vget_high_s16(gc)); \ + int32x4_t bl = vaddl_s16(vget_low_s16(yy), vget_low_s16(ub)); \ + int32x4_t bh = vaddl_s16(vget_high_s16(yy), vget_high_s16(ub)); \ + \ + rl = vmulq_lane_s32(rl, cf32, 0); \ + rh = vmulq_lane_s32(rh, cf32, 0); \ + gl = vmulq_lane_s32(gl, cf32, 0); \ + gh = vmulq_lane_s32(gh, cf32, 0); \ + bl = vmulq_lane_s32(bl, cf32, 0); \ + bh = vmulq_lane_s32(bh, cf32, 0); \ + \ + y = vqmovun_s16(vcombine_s16(vrshrn_n_s32(rl, 16), \ + vrshrn_n_s32(rh, 16))); \ + u = vqmovun_s16(vcombine_s16(vrshrn_n_s32(gl, 16), \ + vrshrn_n_s32(gh, 16))); \ + v = vqmovun_s16(vcombine_s16(vrshrn_n_s32(bl, 16), \ + vrshrn_n_s32(bh, 16))); \ + STR_ ## FMT(out + off, y, u, v); \ + } \ +} + +#define v255 vmov_n_u8(255) + +#define STR_Rgb(out, r, g, b) do { \ + const uint8x8x3_t r_g_b = {{ r, g, b }}; \ + vst3_u8(out, r_g_b); \ +} while (0) + +#define STR_Bgr(out, r, g, b) do { \ + const uint8x8x3_t b_g_r = {{ b, g, r }}; \ + vst3_u8(out, b_g_r); \ +} while (0) + +#define STR_Rgba(out, r, g, b) do { \ + const uint8x8x4_t r_g_b_v255 = {{ r, g, b, v255 }}; \ + vst4_u8(out, r_g_b_v255); \ +} while (0) + +#define STR_Bgra(out, r, g, b) do { \ + const uint8x8x4_t b_g_r_v255 = {{ b, g, r, v255 }}; \ + vst4_u8(out, b_g_r_v255); \ +} while (0) + +#define CONVERT1(FMT, XSTEP, N, src_y, src_uv, rgb, cur_x) { \ + int i; \ + for (i = 0; i < N; i++) { \ + int off = ((cur_x) + i) * XSTEP; \ + int y = src_y[(cur_x) + i]; \ + int u = (src_uv)[i]; \ + int v = (src_uv)[i + 16]; \ + VP8YuvTo ## FMT(y, u, v, rgb + off); \ + } \ +} + +#define CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, uv, \ + top_dst, bottom_dst, cur_x, len) { \ + if (top_y) { \ + CONVERT8(FMT, XSTEP, len, top_y, uv, top_dst, cur_x) \ + } \ + if (bottom_y) { \ + CONVERT8(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x) \ + } \ +} + +#define CONVERT2RGB_1(FMT, XSTEP, top_y, bottom_y, uv, \ + top_dst, bottom_dst, cur_x, len) { \ + if (top_y) { \ + CONVERT1(FMT, XSTEP, len, top_y, uv, top_dst, cur_x); \ + } \ + if (bottom_y) { \ + CONVERT1(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \ + } \ +} + +#define NEON_UPSAMPLE_FUNC(FUNC_NAME, FMT, XSTEP) \ +static void FUNC_NAME(const uint8_t *top_y, const uint8_t *bottom_y, \ + const uint8_t *top_u, const uint8_t *top_v, \ + const uint8_t *cur_u, const uint8_t *cur_v, \ + uint8_t *top_dst, uint8_t *bottom_dst, int len) { \ + int block; \ + /* 16 byte aligned array to cache reconstructed u and v */ \ + uint8_t uv_buf[2 * 32 + 15]; \ + uint8_t *const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \ + const int uv_len = (len + 1) >> 1; \ + /* 9 pixels must be read-able for each block */ \ + const int num_blocks = (uv_len - 1) >> 3; \ + const int leftover = uv_len - num_blocks * 8; \ + const int last_pos = 1 + 16 * num_blocks; \ + \ + const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \ + const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \ + \ + const int16x4_t cf16 = vld1_s16(coef); \ + const int32x2_t cf32 = vmov_n_s32(CY); \ + const uint8x8_t u16 = vmov_n_u8(16); \ + const uint8x8_t u128 = vmov_n_u8(128); \ + \ + /* Treat the first pixel in regular way */ \ + if (top_y) { \ + const int u0 = (top_u[0] + u_diag) >> 1; \ + const int v0 = (top_v[0] + v_diag) >> 1; \ + VP8YuvTo ## FMT(top_y[0], u0, v0, top_dst); \ + } \ + if (bottom_y) { \ + const int u0 = (cur_u[0] + u_diag) >> 1; \ + const int v0 = (cur_v[0] + v_diag) >> 1; \ + VP8YuvTo ## FMT(bottom_y[0], u0, v0, bottom_dst); \ + } \ + \ + for (block = 0; block < num_blocks; ++block) { \ + UPSAMPLE_16PIXELS(top_u, cur_u, r_uv); \ + UPSAMPLE_16PIXELS(top_v, cur_v, r_uv + 16); \ + CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, r_uv, \ + top_dst, bottom_dst, 16 * block + 1, 16); \ + top_u += 8; \ + cur_u += 8; \ + top_v += 8; \ + cur_v += 8; \ + } \ + \ + UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv); \ + UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 16); \ + CONVERT2RGB_1(FMT, XSTEP, top_y, bottom_y, r_uv, \ + top_dst, bottom_dst, last_pos, len - last_pos); \ +} + +// NEON variants of the fancy upsampler. +NEON_UPSAMPLE_FUNC(UpsampleRgbLinePairNEON, Rgb, 3) +NEON_UPSAMPLE_FUNC(UpsampleBgrLinePairNEON, Bgr, 3) +NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePairNEON, Rgba, 4) +NEON_UPSAMPLE_FUNC(UpsampleBgraLinePairNEON, Bgra, 4) + +#endif // FANCY_UPSAMPLING + +#endif // WEBP_USE_NEON + +//------------------------------------------------------------------------------ + +extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */]; + +void WebPInitUpsamplersNEON(void) { +#if defined(WEBP_USE_NEON) + WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePairNEON; + WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePairNEON; + WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePairNEON; + WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePairNEON; +#endif // WEBP_USE_NEON +} + +void WebPInitPremultiplyNEON(void) { +#if defined(WEBP_USE_NEON) + WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePairNEON; + WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePairNEON; +#endif // WEBP_USE_NEON +} + +#if defined(__cplusplus) || defined(c_plusplus) +} // extern "C" +#endif |