// 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 #include #include #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); \ \ { \ 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); \ } //----------------------------------------------------------------------------- // YUV->RGB conversion static const int16_t kCoeffs[4] = { kYScale, kVToR, kUToG, kVToG }; #define v255 vmov_n_u8(255) #define STORE_Rgb(out, r, g, b) do { \ const uint8x8x3_t r_g_b = {{ r, g, b }}; \ vst3_u8(out, r_g_b); \ } while (0) #define STORE_Bgr(out, r, g, b) do { \ const uint8x8x3_t b_g_r = {{ b, g, r }}; \ vst3_u8(out, b_g_r); \ } while (0) #define STORE_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 STORE_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 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 = vmov_n_s32(kUToB); \ const uint8x8_t u16 = vmov_n_u8(16); \ const uint8x8_t u128 = vmov_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(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 //------------------------------------------------------------------------------ #ifdef FANCY_UPSAMPLING 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 } #else // this empty function is to avoid an empty .o void WebPInitPremultiplyNEON(void) {} #endif // FANCY_UPSAMPLING