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Diffstat (limited to 'media/libwebp/dsp/upsampling_sse41.c')
| -rw-r--r-- | media/libwebp/dsp/upsampling_sse41.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/media/libwebp/dsp/upsampling_sse41.c b/media/libwebp/dsp/upsampling_sse41.c new file mode 100644 index 000000000..65d175e87 --- /dev/null +++ b/media/libwebp/dsp/upsampling_sse41.c @@ -0,0 +1,239 @@ +// 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. +// ----------------------------------------------------------------------------- +// +// SSE41 version of YUV to RGB upsampling functions. +// +// Author: somnath@google.com (Somnath Banerjee) + +#include "../dsp/dsp.h" + +#if defined(WEBP_USE_SSE41) + +#include <assert.h> +#include <smmintrin.h> +#include <string.h> +#include "../dsp/yuv.h" + +#ifdef FANCY_UPSAMPLING + +#if !defined(WEBP_REDUCE_CSP) + +// We compute (9*a + 3*b + 3*c + d + 8) / 16 as follows +// u = (9*a + 3*b + 3*c + d + 8) / 16 +// = (a + (a + 3*b + 3*c + d) / 8 + 1) / 2 +// = (a + m + 1) / 2 +// where m = (a + 3*b + 3*c + d) / 8 +// = ((a + b + c + d) / 2 + b + c) / 4 +// +// Let's say k = (a + b + c + d) / 4. +// We can compute k as +// k = (s + t + 1) / 2 - ((a^d) | (b^c) | (s^t)) & 1 +// where s = (a + d + 1) / 2 and t = (b + c + 1) / 2 +// +// Then m can be written as +// m = (k + t + 1) / 2 - (((b^c) & (s^t)) | (k^t)) & 1 + +// Computes out = (k + in + 1) / 2 - ((ij & (s^t)) | (k^in)) & 1 +#define GET_M(ij, in, out) do { \ + const __m128i tmp0 = _mm_avg_epu8(k, (in)); /* (k + in + 1) / 2 */ \ + const __m128i tmp1 = _mm_and_si128((ij), st); /* (ij) & (s^t) */ \ + const __m128i tmp2 = _mm_xor_si128(k, (in)); /* (k^in) */ \ + const __m128i tmp3 = _mm_or_si128(tmp1, tmp2); /* ((ij) & (s^t)) | (k^in) */\ + const __m128i tmp4 = _mm_and_si128(tmp3, one); /* & 1 -> lsb_correction */ \ + (out) = _mm_sub_epi8(tmp0, tmp4); /* (k + in + 1) / 2 - lsb_correction */ \ +} while (0) + +// pack and store two alternating pixel rows +#define PACK_AND_STORE(a, b, da, db, out) do { \ + const __m128i t_a = _mm_avg_epu8(a, da); /* (9a + 3b + 3c + d + 8) / 16 */ \ + const __m128i t_b = _mm_avg_epu8(b, db); /* (3a + 9b + c + 3d + 8) / 16 */ \ + const __m128i t_1 = _mm_unpacklo_epi8(t_a, t_b); \ + const __m128i t_2 = _mm_unpackhi_epi8(t_a, t_b); \ + _mm_store_si128(((__m128i*)(out)) + 0, t_1); \ + _mm_store_si128(((__m128i*)(out)) + 1, t_2); \ +} while (0) + +// Loads 17 pixels each from rows r1 and r2 and generates 32 pixels. +#define UPSAMPLE_32PIXELS(r1, r2, out) { \ + const __m128i one = _mm_set1_epi8(1); \ + const __m128i a = _mm_loadu_si128((const __m128i*)&(r1)[0]); \ + const __m128i b = _mm_loadu_si128((const __m128i*)&(r1)[1]); \ + const __m128i c = _mm_loadu_si128((const __m128i*)&(r2)[0]); \ + const __m128i d = _mm_loadu_si128((const __m128i*)&(r2)[1]); \ + \ + const __m128i s = _mm_avg_epu8(a, d); /* s = (a + d + 1) / 2 */ \ + const __m128i t = _mm_avg_epu8(b, c); /* t = (b + c + 1) / 2 */ \ + const __m128i st = _mm_xor_si128(s, t); /* st = s^t */ \ + \ + const __m128i ad = _mm_xor_si128(a, d); /* ad = a^d */ \ + const __m128i bc = _mm_xor_si128(b, c); /* bc = b^c */ \ + \ + const __m128i t1 = _mm_or_si128(ad, bc); /* (a^d) | (b^c) */ \ + const __m128i t2 = _mm_or_si128(t1, st); /* (a^d) | (b^c) | (s^t) */ \ + const __m128i t3 = _mm_and_si128(t2, one); /* (a^d) | (b^c) | (s^t) & 1 */ \ + const __m128i t4 = _mm_avg_epu8(s, t); \ + const __m128i k = _mm_sub_epi8(t4, t3); /* k = (a + b + c + d) / 4 */ \ + __m128i diag1, diag2; \ + \ + GET_M(bc, t, diag1); /* diag1 = (a + 3b + 3c + d) / 8 */ \ + GET_M(ad, s, diag2); /* diag2 = (3a + b + c + 3d) / 8 */ \ + \ + /* pack the alternate pixels */ \ + PACK_AND_STORE(a, b, diag1, diag2, (out) + 0); /* store top */ \ + PACK_AND_STORE(c, d, diag2, diag1, (out) + 2 * 32); /* store bottom */ \ +} + +// Turn the macro into a function for reducing code-size when non-critical +static void Upsample32Pixels_SSE41(const uint8_t r1[], const uint8_t r2[], + uint8_t* const out) { + UPSAMPLE_32PIXELS(r1, r2, out); +} + +#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \ + uint8_t r1[17], r2[17]; \ + memcpy(r1, (tb), (num_pixels)); \ + memcpy(r2, (bb), (num_pixels)); \ + /* replicate last byte */ \ + memset(r1 + (num_pixels), r1[(num_pixels) - 1], 17 - (num_pixels)); \ + memset(r2 + (num_pixels), r2[(num_pixels) - 1], 17 - (num_pixels)); \ + /* using the shared function instead of the macro saves ~3k code size */ \ + Upsample32Pixels_SSE41(r1, r2, out); \ +} + +#define CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y, \ + top_dst, bottom_dst, cur_x) do { \ + FUNC##32_SSE41((top_y) + (cur_x), r_u, r_v, (top_dst) + (cur_x) * (XSTEP)); \ + if ((bottom_y) != NULL) { \ + FUNC##32_SSE41((bottom_y) + (cur_x), r_u + 64, r_v + 64, \ + (bottom_dst) + (cur_x) * (XSTEP)); \ + } \ +} while (0) + +#define SSE4_UPSAMPLE_FUNC(FUNC_NAME, FUNC, 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 uv_pos, pos; \ + /* 16byte-aligned array to cache reconstructed u and v */ \ + uint8_t uv_buf[14 * 32 + 15] = { 0 }; \ + uint8_t* const r_u = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \ + uint8_t* const r_v = r_u + 32; \ + \ + assert(top_y != NULL); \ + { /* Treat the first pixel in regular way */ \ + 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 int u0_t = (top_u[0] + u_diag) >> 1; \ + const int v0_t = (top_v[0] + v_diag) >> 1; \ + FUNC(top_y[0], u0_t, v0_t, top_dst); \ + if (bottom_y != NULL) { \ + const int u0_b = (cur_u[0] + u_diag) >> 1; \ + const int v0_b = (cur_v[0] + v_diag) >> 1; \ + FUNC(bottom_y[0], u0_b, v0_b, bottom_dst); \ + } \ + } \ + /* For UPSAMPLE_32PIXELS, 17 u/v values must be read-able for each block */ \ + for (pos = 1, uv_pos = 0; pos + 32 + 1 <= len; pos += 32, uv_pos += 16) { \ + UPSAMPLE_32PIXELS(top_u + uv_pos, cur_u + uv_pos, r_u); \ + UPSAMPLE_32PIXELS(top_v + uv_pos, cur_v + uv_pos, r_v); \ + CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y, top_dst, bottom_dst, pos); \ + } \ + if (len > 1) { \ + const int left_over = ((len + 1) >> 1) - (pos >> 1); \ + uint8_t* const tmp_top_dst = r_u + 4 * 32; \ + uint8_t* const tmp_bottom_dst = tmp_top_dst + 4 * 32; \ + uint8_t* const tmp_top = tmp_bottom_dst + 4 * 32; \ + uint8_t* const tmp_bottom = (bottom_y == NULL) ? NULL : tmp_top + 32; \ + assert(left_over > 0); \ + UPSAMPLE_LAST_BLOCK(top_u + uv_pos, cur_u + uv_pos, left_over, r_u); \ + UPSAMPLE_LAST_BLOCK(top_v + uv_pos, cur_v + uv_pos, left_over, r_v); \ + memcpy(tmp_top, top_y + pos, len - pos); \ + if (bottom_y != NULL) memcpy(tmp_bottom, bottom_y + pos, len - pos); \ + CONVERT2RGB_32(FUNC, XSTEP, tmp_top, tmp_bottom, tmp_top_dst, \ + tmp_bottom_dst, 0); \ + memcpy(top_dst + pos * (XSTEP), tmp_top_dst, (len - pos) * (XSTEP)); \ + if (bottom_y != NULL) { \ + memcpy(bottom_dst + pos * (XSTEP), tmp_bottom_dst, \ + (len - pos) * (XSTEP)); \ + } \ + } \ +} + +// SSE4 variants of the fancy upsampler. +SSE4_UPSAMPLE_FUNC(UpsampleRgbLinePair_SSE41, VP8YuvToRgb, 3) +SSE4_UPSAMPLE_FUNC(UpsampleBgrLinePair_SSE41, VP8YuvToBgr, 3) + +#undef GET_M +#undef PACK_AND_STORE +#undef UPSAMPLE_32PIXELS +#undef UPSAMPLE_LAST_BLOCK +#undef CONVERT2RGB +#undef CONVERT2RGB_32 +#undef SSE4_UPSAMPLE_FUNC + +#endif // WEBP_REDUCE_CSP + +//------------------------------------------------------------------------------ +// Entry point + +extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */]; + +extern void WebPInitUpsamplersSSE41(void); + +WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE41(void) { +#if !defined(WEBP_REDUCE_CSP) + WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair_SSE41; + WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair_SSE41; +#endif // WEBP_REDUCE_CSP +} + +#endif // FANCY_UPSAMPLING + +//------------------------------------------------------------------------------ + +extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */]; +extern void WebPInitYUV444ConvertersSSE41(void); + +#define YUV444_FUNC(FUNC_NAME, CALL, CALL_C, XSTEP) \ +extern void CALL_C(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ + uint8_t* dst, int len); \ +static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ + uint8_t* dst, int len) { \ + int i; \ + const int max_len = len & ~31; \ + for (i = 0; i < max_len; i += 32) { \ + CALL(y + i, u + i, v + i, dst + i * (XSTEP)); \ + } \ + if (i < len) { /* C-fallback */ \ + CALL_C(y + i, u + i, v + i, dst + i * (XSTEP), len - i); \ + } \ +} + +#if !defined(WEBP_REDUCE_CSP) +YUV444_FUNC(Yuv444ToRgb_SSE41, VP8YuvToRgb32_SSE41, WebPYuv444ToRgb_C, 3); +YUV444_FUNC(Yuv444ToBgr_SSE41, VP8YuvToBgr32_SSE41, WebPYuv444ToBgr_C, 3); +#endif // WEBP_REDUCE_CSP + +WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersSSE41(void) { +#if !defined(WEBP_REDUCE_CSP) + WebPYUV444Converters[MODE_RGB] = Yuv444ToRgb_SSE41; + WebPYUV444Converters[MODE_BGR] = Yuv444ToBgr_SSE41; +#endif // WEBP_REDUCE_CSP +} + +#else + +WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersSSE41) + +#endif // WEBP_USE_SSE41 + +#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_SSE41)) +WEBP_DSP_INIT_STUB(WebPInitUpsamplersSSE41) +#endif |