| // Copyright 2011 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 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(WEBP_USE_NEON) |
| |
| #include <assert.h> |
| #include <arm_neon.h> |
| #include <string.h> |
| #include "./neon.h" |
| #include "./yuv.h" |
| |
| #ifdef FANCY_UPSAMPLING |
| |
| //----------------------------------------------------------------------------- |
| // U/V 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); \ |
| \ |
| { \ |
| uint8x8x2_t a_b, c_d; \ |
| INIT_VECTOR2(a_b, a, b); \ |
| INIT_VECTOR2(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); \ |
| } |
| |
| //----------------------------------------------------------------------------- |
| // YUV->RGB conversion |
| |
| static const int16_t kCoeffs[4] = { kYScale, kVToR, kUToG, kVToG }; |
| |
| #define v255 vdup_n_u8(255) |
| |
| #define STORE_Rgb(out, r, g, b) do { \ |
| uint8x8x3_t r_g_b; \ |
| INIT_VECTOR3(r_g_b, r, g, b); \ |
| vst3_u8(out, r_g_b); \ |
| } while (0) |
| |
| #define STORE_Bgr(out, r, g, b) do { \ |
| uint8x8x3_t b_g_r; \ |
| INIT_VECTOR3(b_g_r, b, g, r); \ |
| vst3_u8(out, b_g_r); \ |
| } while (0) |
| |
| #define STORE_Rgba(out, r, g, b) do { \ |
| uint8x8x4_t r_g_b_v255; \ |
| INIT_VECTOR4(r_g_b_v255, r, g, b, v255); \ |
| vst4_u8(out, r_g_b_v255); \ |
| } while (0) |
| |
| #define STORE_Bgra(out, r, g, b) do { \ |
| uint8x8x4_t b_g_r_v255; \ |
| INIT_VECTOR4(b_g_r_v255, b, g, r, v255); \ |
| vst4_u8(out, b_g_r_v255); \ |
| } while (0) |
| |
| #define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) { \ |
| int i; \ |
| for (i = 0; i < N; i += 8) { \ |
| const 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); \ |
| const int16x8_t yy = vreinterpretq_s16_u16(vsubl_u8(y, u16)); \ |
| const int16x8_t uu = vreinterpretq_s16_u16(vsubl_u8(u, u128)); \ |
| const int16x8_t vv = vreinterpretq_s16_u16(vsubl_u8(v, u128)); \ |
| int32x4_t yl = vmull_lane_s16(vget_low_s16(yy), cf16, 0); \ |
| int32x4_t yh = vmull_lane_s16(vget_high_s16(yy), cf16, 0); \ |
| const int32x4_t rl = vmlal_lane_s16(yl, vget_low_s16(vv), cf16, 1);\ |
| const int32x4_t rh = vmlal_lane_s16(yh, vget_high_s16(vv), cf16, 1);\ |
| int32x4_t gl = vmlsl_lane_s16(yl, vget_low_s16(uu), cf16, 2); \ |
| int32x4_t gh = vmlsl_lane_s16(yh, vget_high_s16(uu), cf16, 2); \ |
| const int32x4_t bl = vmovl_s16(vget_low_s16(uu)); \ |
| const int32x4_t bh = vmovl_s16(vget_high_s16(uu)); \ |
| gl = vmlsl_lane_s16(gl, vget_low_s16(vv), cf16, 3); \ |
| gh = vmlsl_lane_s16(gh, vget_high_s16(vv), cf16, 3); \ |
| yl = vmlaq_lane_s32(yl, bl, cf32, 0); \ |
| yh = vmlaq_lane_s32(yh, bh, cf32, 0); \ |
| /* vrshrn_n_s32() already incorporates the rounding constant */ \ |
| y = vqmovun_s16(vcombine_s16(vrshrn_n_s32(rl, YUV_FIX2), \ |
| vrshrn_n_s32(rh, YUV_FIX2))); \ |
| u = vqmovun_s16(vcombine_s16(vrshrn_n_s32(gl, YUV_FIX2), \ |
| vrshrn_n_s32(gh, YUV_FIX2))); \ |
| v = vqmovun_s16(vcombine_s16(vrshrn_n_s32(yl, YUV_FIX2), \ |
| vrshrn_n_s32(yh, YUV_FIX2))); \ |
| STORE_ ## FMT(out + off, y, u, v); \ |
| } \ |
| } |
| |
| #define CONVERT1(FUNC, XSTEP, N, src_y, src_uv, rgb, cur_x) { \ |
| int i; \ |
| for (i = 0; i < N; i++) { \ |
| const int off = ((cur_x) + i) * XSTEP; \ |
| const int y = src_y[(cur_x) + i]; \ |
| const int u = (src_uv)[i]; \ |
| const int v = (src_uv)[i + 16]; \ |
| FUNC(y, u, v, rgb + off); \ |
| } \ |
| } |
| |
| #define CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, uv, \ |
| top_dst, bottom_dst, cur_x, len) { \ |
| CONVERT8(FMT, XSTEP, len, top_y, uv, top_dst, cur_x) \ |
| if (bottom_y != NULL) { \ |
| CONVERT8(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x) \ |
| } \ |
| } |
| |
| #define CONVERT2RGB_1(FUNC, XSTEP, top_y, bottom_y, uv, \ |
| top_dst, bottom_dst, cur_x, len) { \ |
| CONVERT1(FUNC, XSTEP, len, top_y, uv, top_dst, cur_x); \ |
| if (bottom_y != NULL) { \ |
| CONVERT1(FUNC, 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(kCoeffs); \ |
| const int32x2_t cf32 = vdup_n_s32(kUToB); \ |
| const uint8x8_t u16 = vdup_n_u8(16); \ |
| const uint8x8_t u128 = vdup_n_u8(128); \ |
| \ |
| /* Treat the first pixel in regular way */ \ |
| assert(top_y != NULL); \ |
| { \ |
| 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 != NULL) { \ |
| 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(VP8YuvTo ## 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(UpsampleRgbLinePair, Rgb, 3) |
| NEON_UPSAMPLE_FUNC(UpsampleBgrLinePair, Bgr, 3) |
| NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePair, Rgba, 4) |
| NEON_UPSAMPLE_FUNC(UpsampleBgraLinePair, Bgra, 4) |
| |
| #endif // FANCY_UPSAMPLING |
| |
| #endif // WEBP_USE_NEON |
| |
| //------------------------------------------------------------------------------ |
| |
| extern void WebPInitUpsamplersNEON(void); |
| |
| #ifdef FANCY_UPSAMPLING |
| |
| extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */]; |
| |
| void WebPInitUpsamplersNEON(void) { |
| #if defined(WEBP_USE_NEON) |
| WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair; |
| WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair; |
| WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair; |
| WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair; |
| WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair; |
| WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair; |
| #endif // WEBP_USE_NEON |
| } |
| |
| #else |
| |
| // this empty function is to avoid an empty .o |
| void WebPInitUpsamplersNEON(void) {} |
| |
| #endif // FANCY_UPSAMPLING |
