210 lines
12 KiB
C
210 lines
12 KiB
C
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// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// SSE2 version of YUV to RGB upsampling functions.
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//
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// Author: somnath@google.com (Somnath Banerjee)
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#include "./dsp.h"
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#if defined(WEBP_USE_SSE2)
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#include <assert.h>
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#include <emmintrin.h>
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#include <string.h>
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#include "./yuv.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#ifdef FANCY_UPSAMPLING
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// We compute (9*a + 3*b + 3*c + d + 8) / 16 as follows
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// u = (9*a + 3*b + 3*c + d + 8) / 16
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// = (a + (a + 3*b + 3*c + d) / 8 + 1) / 2
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// = (a + m + 1) / 2
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// where m = (a + 3*b + 3*c + d) / 8
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// = ((a + b + c + d) / 2 + b + c) / 4
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//
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// Let's say k = (a + b + c + d) / 4.
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// We can compute k as
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// k = (s + t + 1) / 2 - ((a^d) | (b^c) | (s^t)) & 1
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// where s = (a + d + 1) / 2 and t = (b + c + 1) / 2
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//
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// Then m can be written as
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// m = (k + t + 1) / 2 - (((b^c) & (s^t)) | (k^t)) & 1
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// Computes out = (k + in + 1) / 2 - ((ij & (s^t)) | (k^in)) & 1
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#define GET_M(ij, in, out) do { \
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const __m128i tmp0 = _mm_avg_epu8(k, (in)); /* (k + in + 1) / 2 */ \
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const __m128i tmp1 = _mm_and_si128((ij), st); /* (ij) & (s^t) */ \
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const __m128i tmp2 = _mm_xor_si128(k, (in)); /* (k^in) */ \
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const __m128i tmp3 = _mm_or_si128(tmp1, tmp2); /* ((ij) & (s^t)) | (k^in) */\
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const __m128i tmp4 = _mm_and_si128(tmp3, one); /* & 1 -> lsb_correction */ \
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(out) = _mm_sub_epi8(tmp0, tmp4); /* (k + in + 1) / 2 - lsb_correction */ \
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} while (0)
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// pack and store two alterning pixel rows
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#define PACK_AND_STORE(a, b, da, db, out) do { \
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const __m128i ta = _mm_avg_epu8(a, da); /* (9a + 3b + 3c + d + 8) / 16 */ \
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const __m128i tb = _mm_avg_epu8(b, db); /* (3a + 9b + c + 3d + 8) / 16 */ \
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const __m128i t1 = _mm_unpacklo_epi8(ta, tb); \
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const __m128i t2 = _mm_unpackhi_epi8(ta, tb); \
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_mm_store_si128(((__m128i*)(out)) + 0, t1); \
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_mm_store_si128(((__m128i*)(out)) + 1, t2); \
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} while (0)
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// Loads 17 pixels each from rows r1 and r2 and generates 32 pixels.
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#define UPSAMPLE_32PIXELS(r1, r2, out) { \
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const __m128i one = _mm_set1_epi8(1); \
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const __m128i a = _mm_loadu_si128((__m128i*)&(r1)[0]); \
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const __m128i b = _mm_loadu_si128((__m128i*)&(r1)[1]); \
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const __m128i c = _mm_loadu_si128((__m128i*)&(r2)[0]); \
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const __m128i d = _mm_loadu_si128((__m128i*)&(r2)[1]); \
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\
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const __m128i s = _mm_avg_epu8(a, d); /* s = (a + d + 1) / 2 */ \
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const __m128i t = _mm_avg_epu8(b, c); /* t = (b + c + 1) / 2 */ \
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const __m128i st = _mm_xor_si128(s, t); /* st = s^t */ \
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\
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const __m128i ad = _mm_xor_si128(a, d); /* ad = a^d */ \
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const __m128i bc = _mm_xor_si128(b, c); /* bc = b^c */ \
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\
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const __m128i t1 = _mm_or_si128(ad, bc); /* (a^d) | (b^c) */ \
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const __m128i t2 = _mm_or_si128(t1, st); /* (a^d) | (b^c) | (s^t) */ \
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const __m128i t3 = _mm_and_si128(t2, one); /* (a^d) | (b^c) | (s^t) & 1 */ \
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const __m128i t4 = _mm_avg_epu8(s, t); \
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const __m128i k = _mm_sub_epi8(t4, t3); /* k = (a + b + c + d) / 4 */ \
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__m128i diag1, diag2; \
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\
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GET_M(bc, t, diag1); /* diag1 = (a + 3b + 3c + d) / 8 */ \
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GET_M(ad, s, diag2); /* diag2 = (3a + b + c + 3d) / 8 */ \
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\
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/* pack the alternate pixels */ \
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PACK_AND_STORE(a, b, diag1, diag2, &(out)[0 * 32]); \
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PACK_AND_STORE(c, d, diag2, diag1, &(out)[2 * 32]); \
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}
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// Turn the macro into a function for reducing code-size when non-critical
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static void Upsample32Pixels(const uint8_t r1[], const uint8_t r2[],
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uint8_t* const out) {
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UPSAMPLE_32PIXELS(r1, r2, out);
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}
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#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \
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uint8_t r1[17], r2[17]; \
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memcpy(r1, (tb), (num_pixels)); \
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memcpy(r2, (bb), (num_pixels)); \
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/* replicate last byte */ \
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memset(r1 + (num_pixels), r1[(num_pixels) - 1], 17 - (num_pixels)); \
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memset(r2 + (num_pixels), r2[(num_pixels) - 1], 17 - (num_pixels)); \
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/* using the shared function instead of the macro saves ~3k code size */ \
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Upsample32Pixels(r1, r2, out); \
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}
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#define CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y, uv, \
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top_dst, bottom_dst, cur_x, num_pixels) { \
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int n; \
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if (top_y) { \
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for (n = 0; n < (num_pixels); ++n) { \
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FUNC(top_y[(cur_x) + n], (uv)[n], (uv)[32 + n], \
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top_dst + ((cur_x) + n) * XSTEP); \
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} \
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} \
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if (bottom_y) { \
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for (n = 0; n < (num_pixels); ++n) { \
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FUNC(bottom_y[(cur_x) + n], (uv)[64 + n], (uv)[64 + 32 + n], \
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bottom_dst + ((cur_x) + n) * XSTEP); \
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} \
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} \
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}
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#define SSE2_UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \
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static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \
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const uint8_t* top_u, const uint8_t* top_v, \
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const uint8_t* cur_u, const uint8_t* cur_v, \
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uint8_t* top_dst, uint8_t* bottom_dst, int len) { \
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int b; \
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/* 16 byte aligned array to cache reconstructed u and v */ \
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uint8_t uv_buf[4 * 32 + 15]; \
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uint8_t* const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \
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const int uv_len = (len + 1) >> 1; \
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/* 17 pixels must be read-able for each block */ \
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const int num_blocks = (uv_len - 1) >> 4; \
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const int leftover = uv_len - num_blocks * 16; \
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const int last_pos = 1 + 32 * num_blocks; \
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\
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const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \
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const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \
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\
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assert(len > 0); \
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/* Treat the first pixel in regular way */ \
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if (top_y) { \
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const int u0 = (top_u[0] + u_diag) >> 1; \
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const int v0 = (top_v[0] + v_diag) >> 1; \
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FUNC(top_y[0], u0, v0, top_dst); \
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} \
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if (bottom_y) { \
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const int u0 = (cur_u[0] + u_diag) >> 1; \
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const int v0 = (cur_v[0] + v_diag) >> 1; \
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FUNC(bottom_y[0], u0, v0, bottom_dst); \
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} \
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\
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for (b = 0; b < num_blocks; ++b) { \
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UPSAMPLE_32PIXELS(top_u, cur_u, r_uv + 0 * 32); \
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UPSAMPLE_32PIXELS(top_v, cur_v, r_uv + 1 * 32); \
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CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y, r_uv, top_dst, bottom_dst, \
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32 * b + 1, 32) \
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top_u += 16; \
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cur_u += 16; \
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top_v += 16; \
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cur_v += 16; \
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} \
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\
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UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv + 0 * 32); \
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UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 1 * 32); \
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CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y, r_uv, top_dst, bottom_dst, \
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last_pos, len - last_pos); \
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}
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// SSE2 variants of the fancy upsampler.
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SSE2_UPSAMPLE_FUNC(UpsampleRgbLinePairSSE2, VP8YuvToRgb, 3)
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SSE2_UPSAMPLE_FUNC(UpsampleBgrLinePairSSE2, VP8YuvToBgr, 3)
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SSE2_UPSAMPLE_FUNC(UpsampleRgbaLinePairSSE2, VP8YuvToRgba, 4)
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SSE2_UPSAMPLE_FUNC(UpsampleBgraLinePairSSE2, VP8YuvToBgra, 4)
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#undef GET_M
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#undef PACK_AND_STORE
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#undef UPSAMPLE_32PIXELS
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#undef UPSAMPLE_LAST_BLOCK
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#undef CONVERT2RGB
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#undef SSE2_UPSAMPLE_FUNC
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//------------------------------------------------------------------------------
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extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
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void WebPInitUpsamplersSSE2(void) {
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WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePairSSE2;
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WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePairSSE2;
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WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePairSSE2;
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WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePairSSE2;
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}
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void WebPInitPremultiplySSE2(void) {
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WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePairSSE2;
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WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePairSSE2;
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}
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#endif // FANCY_UPSAMPLING
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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#endif // WEBP_USE_SSE2
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