1 | // Copyright 2015 Google Inc. All Rights Reserved. |
2 | // |
3 | // Use of this source code is governed by a BSD-style license |
4 | // that can be found in the COPYING file in the root of the source |
5 | // tree. An additional intellectual property rights grant can be found |
6 | // in the file PATENTS. All contributing project authors may |
7 | // be found in the AUTHORS file in the root of the source tree. |
8 | // ----------------------------------------------------------------------------- |
9 | // |
10 | // SSE2 Rescaling functions |
11 | // |
12 | // Author: Skal (pascal.massimino@gmail.com) |
13 | |
14 | #include "./dsp.h" |
15 | |
16 | #if defined(WEBP_USE_SSE2) |
17 | #include <emmintrin.h> |
18 | |
19 | #include <assert.h> |
20 | #include "../utils/rescaler_utils.h" |
21 | #include "../utils/utils.h" |
22 | |
23 | //------------------------------------------------------------------------------ |
24 | // Implementations of critical functions ImportRow / ExportRow |
25 | |
26 | #define ROUNDER (WEBP_RESCALER_ONE >> 1) |
27 | #define MULT_FIX(x, y) (((uint64_t)(x) * (y) + ROUNDER) >> WEBP_RESCALER_RFIX) |
28 | |
29 | // input: 8 bytes ABCDEFGH -> output: A0E0B0F0C0G0D0H0 |
30 | static void LoadTwoPixels(const uint8_t* const src, __m128i* out) { |
31 | const __m128i zero = _mm_setzero_si128(); |
32 | const __m128i A = _mm_loadl_epi64((const __m128i*)(src)); // ABCDEFGH |
33 | const __m128i B = _mm_unpacklo_epi8(A, zero); // A0B0C0D0E0F0G0H0 |
34 | const __m128i C = _mm_srli_si128(B, 8); // E0F0G0H0 |
35 | *out = _mm_unpacklo_epi16(B, C); |
36 | } |
37 | |
38 | // input: 8 bytes ABCDEFGH -> output: A0B0C0D0E0F0G0H0 |
39 | static void LoadHeightPixels(const uint8_t* const src, __m128i* out) { |
40 | const __m128i zero = _mm_setzero_si128(); |
41 | const __m128i A = _mm_loadl_epi64((const __m128i*)(src)); // ABCDEFGH |
42 | *out = _mm_unpacklo_epi8(A, zero); |
43 | } |
44 | |
45 | static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk, |
46 | const uint8_t* src) { |
47 | rescaler_t* frow = wrk->frow; |
48 | const rescaler_t* const frow_end = frow + wrk->dst_width * wrk->num_channels; |
49 | const int x_add = wrk->x_add; |
50 | int accum = x_add; |
51 | __m128i cur_pixels; |
52 | |
53 | assert(!WebPRescalerInputDone(wrk)); |
54 | assert(wrk->x_expand); |
55 | if (wrk->num_channels == 4) { |
56 | if (wrk->src_width < 2) { |
57 | WebPRescalerImportRowExpandC(wrk, src); |
58 | return; |
59 | } |
60 | LoadTwoPixels(src, &cur_pixels); |
61 | src += 4; |
62 | while (1) { |
63 | const __m128i mult = _mm_set1_epi32(((x_add - accum) << 16) | accum); |
64 | const __m128i out = _mm_madd_epi16(cur_pixels, mult); |
65 | _mm_storeu_si128((__m128i*)frow, out); |
66 | frow += 4; |
67 | if (frow >= frow_end) break; |
68 | accum -= wrk->x_sub; |
69 | if (accum < 0) { |
70 | LoadTwoPixels(src, &cur_pixels); |
71 | src += 4; |
72 | accum += x_add; |
73 | } |
74 | } |
75 | } else { |
76 | int left; |
77 | const uint8_t* const src_limit = src + wrk->src_width - 8; |
78 | if (wrk->src_width < 8) { |
79 | WebPRescalerImportRowExpandC(wrk, src); |
80 | return; |
81 | } |
82 | LoadHeightPixels(src, &cur_pixels); |
83 | src += 7; |
84 | left = 7; |
85 | while (1) { |
86 | const __m128i mult = _mm_cvtsi32_si128(((x_add - accum) << 16) | accum); |
87 | const __m128i out = _mm_madd_epi16(cur_pixels, mult); |
88 | assert(sizeof(*frow) == sizeof(uint32_t)); |
89 | WebPUint32ToMem((uint8_t*)frow, _mm_cvtsi128_si32(out)); |
90 | frow += 1; |
91 | if (frow >= frow_end) break; |
92 | accum -= wrk->x_sub; |
93 | if (accum < 0) { |
94 | if (--left) { |
95 | cur_pixels = _mm_srli_si128(cur_pixels, 2); |
96 | } else if (src <= src_limit) { |
97 | LoadHeightPixels(src, &cur_pixels); |
98 | src += 7; |
99 | left = 7; |
100 | } else { // tail |
101 | cur_pixels = _mm_srli_si128(cur_pixels, 2); |
102 | cur_pixels = _mm_insert_epi16(cur_pixels, src[1], 1); |
103 | src += 1; |
104 | left = 1; |
105 | } |
106 | accum += x_add; |
107 | } |
108 | } |
109 | } |
110 | assert(accum == 0); |
111 | } |
112 | |
113 | static void RescalerImportRowShrinkSSE2(WebPRescaler* const wrk, |
114 | const uint8_t* src) { |
115 | const int x_sub = wrk->x_sub; |
116 | int accum = 0; |
117 | const __m128i zero = _mm_setzero_si128(); |
118 | const __m128i mult0 = _mm_set1_epi16(x_sub); |
119 | const __m128i mult1 = _mm_set1_epi32(wrk->fx_scale); |
120 | const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER); |
121 | __m128i sum = zero; |
122 | rescaler_t* frow = wrk->frow; |
123 | const rescaler_t* const frow_end = wrk->frow + 4 * wrk->dst_width; |
124 | |
125 | if (wrk->num_channels != 4 || wrk->x_add > (x_sub << 7)) { |
126 | WebPRescalerImportRowShrinkC(wrk, src); |
127 | return; |
128 | } |
129 | assert(!WebPRescalerInputDone(wrk)); |
130 | assert(!wrk->x_expand); |
131 | |
132 | for (; frow < frow_end; frow += 4) { |
133 | __m128i base = zero; |
134 | accum += wrk->x_add; |
135 | while (accum > 0) { |
136 | const __m128i A = _mm_cvtsi32_si128(WebPMemToUint32(src)); |
137 | src += 4; |
138 | base = _mm_unpacklo_epi8(A, zero); |
139 | // To avoid overflow, we need: base * x_add / x_sub < 32768 |
140 | // => x_add < x_sub << 7. That's a 1/128 reduction ratio limit. |
141 | sum = _mm_add_epi16(sum, base); |
142 | accum -= x_sub; |
143 | } |
144 | { // Emit next horizontal pixel. |
145 | const __m128i mult = _mm_set1_epi16(-accum); |
146 | const __m128i frac0 = _mm_mullo_epi16(base, mult); // 16b x 16b -> 32b |
147 | const __m128i frac1 = _mm_mulhi_epu16(base, mult); |
148 | const __m128i frac = _mm_unpacklo_epi16(frac0, frac1); // frac is 32b |
149 | const __m128i A0 = _mm_mullo_epi16(sum, mult0); |
150 | const __m128i A1 = _mm_mulhi_epu16(sum, mult0); |
151 | const __m128i B0 = _mm_unpacklo_epi16(A0, A1); // sum * x_sub |
152 | const __m128i frow_out = _mm_sub_epi32(B0, frac); // sum * x_sub - frac |
153 | const __m128i D0 = _mm_srli_epi64(frac, 32); |
154 | const __m128i D1 = _mm_mul_epu32(frac, mult1); // 32b x 16b -> 64b |
155 | const __m128i D2 = _mm_mul_epu32(D0, mult1); |
156 | const __m128i E1 = _mm_add_epi64(D1, rounder); |
157 | const __m128i E2 = _mm_add_epi64(D2, rounder); |
158 | const __m128i F1 = _mm_shuffle_epi32(E1, 1 | (3 << 2)); |
159 | const __m128i F2 = _mm_shuffle_epi32(E2, 1 | (3 << 2)); |
160 | const __m128i G = _mm_unpacklo_epi32(F1, F2); |
161 | sum = _mm_packs_epi32(G, zero); |
162 | _mm_storeu_si128((__m128i*)frow, frow_out); |
163 | } |
164 | } |
165 | assert(accum == 0); |
166 | } |
167 | |
168 | //------------------------------------------------------------------------------ |
169 | // Row export |
170 | |
171 | // load *src as epi64, multiply by mult and store result in [out0 ... out3] |
172 | static WEBP_INLINE void LoadDispatchAndMult(const rescaler_t* const src, |
173 | const __m128i* const mult, |
174 | __m128i* const out0, |
175 | __m128i* const out1, |
176 | __m128i* const out2, |
177 | __m128i* const out3) { |
178 | const __m128i A0 = _mm_loadu_si128((const __m128i*)(src + 0)); |
179 | const __m128i A1 = _mm_loadu_si128((const __m128i*)(src + 4)); |
180 | const __m128i A2 = _mm_srli_epi64(A0, 32); |
181 | const __m128i A3 = _mm_srli_epi64(A1, 32); |
182 | if (mult != NULL) { |
183 | *out0 = _mm_mul_epu32(A0, *mult); |
184 | *out1 = _mm_mul_epu32(A1, *mult); |
185 | *out2 = _mm_mul_epu32(A2, *mult); |
186 | *out3 = _mm_mul_epu32(A3, *mult); |
187 | } else { |
188 | *out0 = A0; |
189 | *out1 = A1; |
190 | *out2 = A2; |
191 | *out3 = A3; |
192 | } |
193 | } |
194 | |
195 | static WEBP_INLINE void ProcessRow(const __m128i* const A0, |
196 | const __m128i* const A1, |
197 | const __m128i* const A2, |
198 | const __m128i* const A3, |
199 | const __m128i* const mult, |
200 | uint8_t* const dst) { |
201 | const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER); |
202 | const __m128i mask = _mm_set_epi32(0xffffffffu, 0, 0xffffffffu, 0); |
203 | const __m128i B0 = _mm_mul_epu32(*A0, *mult); |
204 | const __m128i B1 = _mm_mul_epu32(*A1, *mult); |
205 | const __m128i B2 = _mm_mul_epu32(*A2, *mult); |
206 | const __m128i B3 = _mm_mul_epu32(*A3, *mult); |
207 | const __m128i C0 = _mm_add_epi64(B0, rounder); |
208 | const __m128i C1 = _mm_add_epi64(B1, rounder); |
209 | const __m128i C2 = _mm_add_epi64(B2, rounder); |
210 | const __m128i C3 = _mm_add_epi64(B3, rounder); |
211 | const __m128i D0 = _mm_srli_epi64(C0, WEBP_RESCALER_RFIX); |
212 | const __m128i D1 = _mm_srli_epi64(C1, WEBP_RESCALER_RFIX); |
213 | #if (WEBP_RESCALER_FIX < 32) |
214 | const __m128i D2 = |
215 | _mm_and_si128(_mm_slli_epi64(C2, 32 - WEBP_RESCALER_RFIX), mask); |
216 | const __m128i D3 = |
217 | _mm_and_si128(_mm_slli_epi64(C3, 32 - WEBP_RESCALER_RFIX), mask); |
218 | #else |
219 | const __m128i D2 = _mm_and_si128(C2, mask); |
220 | const __m128i D3 = _mm_and_si128(C3, mask); |
221 | #endif |
222 | const __m128i E0 = _mm_or_si128(D0, D2); |
223 | const __m128i E1 = _mm_or_si128(D1, D3); |
224 | const __m128i F = _mm_packs_epi32(E0, E1); |
225 | const __m128i G = _mm_packus_epi16(F, F); |
226 | _mm_storel_epi64((__m128i*)dst, G); |
227 | } |
228 | |
229 | static void RescalerExportRowExpandSSE2(WebPRescaler* const wrk) { |
230 | int x_out; |
231 | uint8_t* const dst = wrk->dst; |
232 | rescaler_t* const irow = wrk->irow; |
233 | const int x_out_max = wrk->dst_width * wrk->num_channels; |
234 | const rescaler_t* const frow = wrk->frow; |
235 | const __m128i mult = _mm_set_epi32(0, wrk->fy_scale, 0, wrk->fy_scale); |
236 | |
237 | assert(!WebPRescalerOutputDone(wrk)); |
238 | assert(wrk->y_accum <= 0 && wrk->y_sub + wrk->y_accum >= 0); |
239 | assert(wrk->y_expand); |
240 | if (wrk->y_accum == 0) { |
241 | for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) { |
242 | __m128i A0, A1, A2, A3; |
243 | LoadDispatchAndMult(frow + x_out, NULL, &A0, &A1, &A2, &A3); |
244 | ProcessRow(&A0, &A1, &A2, &A3, &mult, dst + x_out); |
245 | } |
246 | for (; x_out < x_out_max; ++x_out) { |
247 | const uint32_t J = frow[x_out]; |
248 | const int v = (int)MULT_FIX(J, wrk->fy_scale); |
249 | assert(v >= 0 && v <= 255); |
250 | dst[x_out] = v; |
251 | } |
252 | } else { |
253 | const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub); |
254 | const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B); |
255 | const __m128i mA = _mm_set_epi32(0, A, 0, A); |
256 | const __m128i mB = _mm_set_epi32(0, B, 0, B); |
257 | const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER); |
258 | for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) { |
259 | __m128i A0, A1, A2, A3, B0, B1, B2, B3; |
260 | LoadDispatchAndMult(frow + x_out, &mA, &A0, &A1, &A2, &A3); |
261 | LoadDispatchAndMult(irow + x_out, &mB, &B0, &B1, &B2, &B3); |
262 | { |
263 | const __m128i C0 = _mm_add_epi64(A0, B0); |
264 | const __m128i C1 = _mm_add_epi64(A1, B1); |
265 | const __m128i C2 = _mm_add_epi64(A2, B2); |
266 | const __m128i C3 = _mm_add_epi64(A3, B3); |
267 | const __m128i D0 = _mm_add_epi64(C0, rounder); |
268 | const __m128i D1 = _mm_add_epi64(C1, rounder); |
269 | const __m128i D2 = _mm_add_epi64(C2, rounder); |
270 | const __m128i D3 = _mm_add_epi64(C3, rounder); |
271 | const __m128i E0 = _mm_srli_epi64(D0, WEBP_RESCALER_RFIX); |
272 | const __m128i E1 = _mm_srli_epi64(D1, WEBP_RESCALER_RFIX); |
273 | const __m128i E2 = _mm_srli_epi64(D2, WEBP_RESCALER_RFIX); |
274 | const __m128i E3 = _mm_srli_epi64(D3, WEBP_RESCALER_RFIX); |
275 | ProcessRow(&E0, &E1, &E2, &E3, &mult, dst + x_out); |
276 | } |
277 | } |
278 | for (; x_out < x_out_max; ++x_out) { |
279 | const uint64_t I = (uint64_t)A * frow[x_out] |
280 | + (uint64_t)B * irow[x_out]; |
281 | const uint32_t J = (uint32_t)((I + ROUNDER) >> WEBP_RESCALER_RFIX); |
282 | const int v = (int)MULT_FIX(J, wrk->fy_scale); |
283 | assert(v >= 0 && v <= 255); |
284 | dst[x_out] = v; |
285 | } |
286 | } |
287 | } |
288 | |
289 | static void RescalerExportRowShrinkSSE2(WebPRescaler* const wrk) { |
290 | int x_out; |
291 | uint8_t* const dst = wrk->dst; |
292 | rescaler_t* const irow = wrk->irow; |
293 | const int x_out_max = wrk->dst_width * wrk->num_channels; |
294 | const rescaler_t* const frow = wrk->frow; |
295 | const uint32_t yscale = wrk->fy_scale * (-wrk->y_accum); |
296 | assert(!WebPRescalerOutputDone(wrk)); |
297 | assert(wrk->y_accum <= 0); |
298 | assert(!wrk->y_expand); |
299 | if (yscale) { |
300 | const int scale_xy = wrk->fxy_scale; |
301 | const __m128i mult_xy = _mm_set_epi32(0, scale_xy, 0, scale_xy); |
302 | const __m128i mult_y = _mm_set_epi32(0, yscale, 0, yscale); |
303 | const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER); |
304 | for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) { |
305 | __m128i A0, A1, A2, A3, B0, B1, B2, B3; |
306 | LoadDispatchAndMult(irow + x_out, NULL, &A0, &A1, &A2, &A3); |
307 | LoadDispatchAndMult(frow + x_out, &mult_y, &B0, &B1, &B2, &B3); |
308 | { |
309 | const __m128i C0 = _mm_add_epi64(B0, rounder); |
310 | const __m128i C1 = _mm_add_epi64(B1, rounder); |
311 | const __m128i C2 = _mm_add_epi64(B2, rounder); |
312 | const __m128i C3 = _mm_add_epi64(B3, rounder); |
313 | const __m128i D0 = _mm_srli_epi64(C0, WEBP_RESCALER_RFIX); // = frac |
314 | const __m128i D1 = _mm_srli_epi64(C1, WEBP_RESCALER_RFIX); |
315 | const __m128i D2 = _mm_srli_epi64(C2, WEBP_RESCALER_RFIX); |
316 | const __m128i D3 = _mm_srli_epi64(C3, WEBP_RESCALER_RFIX); |
317 | const __m128i E0 = _mm_sub_epi64(A0, D0); // irow[x] - frac |
318 | const __m128i E1 = _mm_sub_epi64(A1, D1); |
319 | const __m128i E2 = _mm_sub_epi64(A2, D2); |
320 | const __m128i E3 = _mm_sub_epi64(A3, D3); |
321 | const __m128i F2 = _mm_slli_epi64(D2, 32); |
322 | const __m128i F3 = _mm_slli_epi64(D3, 32); |
323 | const __m128i G0 = _mm_or_si128(D0, F2); |
324 | const __m128i G1 = _mm_or_si128(D1, F3); |
325 | _mm_storeu_si128((__m128i*)(irow + x_out + 0), G0); |
326 | _mm_storeu_si128((__m128i*)(irow + x_out + 4), G1); |
327 | ProcessRow(&E0, &E1, &E2, &E3, &mult_xy, dst + x_out); |
328 | } |
329 | } |
330 | for (; x_out < x_out_max; ++x_out) { |
331 | const uint32_t frac = (int)MULT_FIX(frow[x_out], yscale); |
332 | const int v = (int)MULT_FIX(irow[x_out] - frac, wrk->fxy_scale); |
333 | assert(v >= 0 && v <= 255); |
334 | dst[x_out] = v; |
335 | irow[x_out] = frac; // new fractional start |
336 | } |
337 | } else { |
338 | const uint32_t scale = wrk->fxy_scale; |
339 | const __m128i mult = _mm_set_epi32(0, scale, 0, scale); |
340 | const __m128i zero = _mm_setzero_si128(); |
341 | for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) { |
342 | __m128i A0, A1, A2, A3; |
343 | LoadDispatchAndMult(irow + x_out, NULL, &A0, &A1, &A2, &A3); |
344 | _mm_storeu_si128((__m128i*)(irow + x_out + 0), zero); |
345 | _mm_storeu_si128((__m128i*)(irow + x_out + 4), zero); |
346 | ProcessRow(&A0, &A1, &A2, &A3, &mult, dst + x_out); |
347 | } |
348 | for (; x_out < x_out_max; ++x_out) { |
349 | const int v = (int)MULT_FIX(irow[x_out], scale); |
350 | assert(v >= 0 && v <= 255); |
351 | dst[x_out] = v; |
352 | irow[x_out] = 0; |
353 | } |
354 | } |
355 | } |
356 | |
357 | #undef MULT_FIX |
358 | #undef ROUNDER |
359 | |
360 | //------------------------------------------------------------------------------ |
361 | |
362 | extern void WebPRescalerDspInitSSE2(void); |
363 | |
364 | WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitSSE2(void) { |
365 | WebPRescalerImportRowExpand = RescalerImportRowExpandSSE2; |
366 | WebPRescalerImportRowShrink = RescalerImportRowShrinkSSE2; |
367 | WebPRescalerExportRowExpand = RescalerExportRowExpandSSE2; |
368 | WebPRescalerExportRowShrink = RescalerExportRowShrinkSSE2; |
369 | } |
370 | |
371 | #else // !WEBP_USE_SSE2 |
372 | |
373 | WEBP_DSP_INIT_STUB(WebPRescalerDspInitSSE2) |
374 | |
375 | #endif // WEBP_USE_SSE2 |
376 | |