1 // Copyright 2010 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 // Speed-critical decoding functions, default plain-C implementations.
11 //
12 // Author: Skal (pascal.massimino@gmail.com)
13
14 #include <assert.h>
15
16 #include "src/dsp/dsp.h"
17 #include "src/dec/vp8i_dec.h"
18 #include "src/utils/utils.h"
19
20 //------------------------------------------------------------------------------
21
clip_8b(int v)22 static WEBP_INLINE uint8_t clip_8b(int v) {
23 return (!(v & ~0xff)) ? v : (v < 0) ? 0 : 255;
24 }
25
26 //------------------------------------------------------------------------------
27 // Transforms (Paragraph 14.4)
28
29 #define STORE(x, y, v) \
30 dst[(x) + (y) * BPS] = clip_8b(dst[(x) + (y) * BPS] + ((v) >> 3))
31
32 #define STORE2(y, dc, d, c) do { \
33 const int DC = (dc); \
34 STORE(0, y, DC + (d)); \
35 STORE(1, y, DC + (c)); \
36 STORE(2, y, DC - (c)); \
37 STORE(3, y, DC - (d)); \
38 } while (0)
39
40 #define MUL1(a) ((((a) * 20091) >> 16) + (a))
41 #define MUL2(a) (((a) * 35468) >> 16)
42
43 #if !WEBP_NEON_OMIT_C_CODE
TransformOne_C(const int16_t * in,uint8_t * dst)44 static void TransformOne_C(const int16_t* in, uint8_t* dst) {
45 int C[4 * 4], *tmp;
46 int i;
47 tmp = C;
48 for (i = 0; i < 4; ++i) { // vertical pass
49 const int a = in[0] + in[8]; // [-4096, 4094]
50 const int b = in[0] - in[8]; // [-4095, 4095]
51 const int c = MUL2(in[4]) - MUL1(in[12]); // [-3783, 3783]
52 const int d = MUL1(in[4]) + MUL2(in[12]); // [-3785, 3781]
53 tmp[0] = a + d; // [-7881, 7875]
54 tmp[1] = b + c; // [-7878, 7878]
55 tmp[2] = b - c; // [-7878, 7878]
56 tmp[3] = a - d; // [-7877, 7879]
57 tmp += 4;
58 in++;
59 }
60 // Each pass is expanding the dynamic range by ~3.85 (upper bound).
61 // The exact value is (2. + (20091 + 35468) / 65536).
62 // After the second pass, maximum interval is [-3794, 3794], assuming
63 // an input in [-2048, 2047] interval. We then need to add a dst value
64 // in the [0, 255] range.
65 // In the worst case scenario, the input to clip_8b() can be as large as
66 // [-60713, 60968].
67 tmp = C;
68 for (i = 0; i < 4; ++i) { // horizontal pass
69 const int dc = tmp[0] + 4;
70 const int a = dc + tmp[8];
71 const int b = dc - tmp[8];
72 const int c = MUL2(tmp[4]) - MUL1(tmp[12]);
73 const int d = MUL1(tmp[4]) + MUL2(tmp[12]);
74 STORE(0, 0, a + d);
75 STORE(1, 0, b + c);
76 STORE(2, 0, b - c);
77 STORE(3, 0, a - d);
78 tmp++;
79 dst += BPS;
80 }
81 }
82
83 // Simplified transform when only in[0], in[1] and in[4] are non-zero
TransformAC3_C(const int16_t * in,uint8_t * dst)84 static void TransformAC3_C(const int16_t* in, uint8_t* dst) {
85 const int a = in[0] + 4;
86 const int c4 = MUL2(in[4]);
87 const int d4 = MUL1(in[4]);
88 const int c1 = MUL2(in[1]);
89 const int d1 = MUL1(in[1]);
90 STORE2(0, a + d4, d1, c1);
91 STORE2(1, a + c4, d1, c1);
92 STORE2(2, a - c4, d1, c1);
93 STORE2(3, a - d4, d1, c1);
94 }
95 #undef MUL1
96 #undef MUL2
97 #undef STORE2
98
TransformTwo_C(const int16_t * in,uint8_t * dst,int do_two)99 static void TransformTwo_C(const int16_t* in, uint8_t* dst, int do_two) {
100 TransformOne_C(in, dst);
101 if (do_two) {
102 TransformOne_C(in + 16, dst + 4);
103 }
104 }
105 #endif // !WEBP_NEON_OMIT_C_CODE
106
TransformUV_C(const int16_t * in,uint8_t * dst)107 static void TransformUV_C(const int16_t* in, uint8_t* dst) {
108 VP8Transform(in + 0 * 16, dst, 1);
109 VP8Transform(in + 2 * 16, dst + 4 * BPS, 1);
110 }
111
112 #if !WEBP_NEON_OMIT_C_CODE
TransformDC_C(const int16_t * in,uint8_t * dst)113 static void TransformDC_C(const int16_t* in, uint8_t* dst) {
114 const int DC = in[0] + 4;
115 int i, j;
116 for (j = 0; j < 4; ++j) {
117 for (i = 0; i < 4; ++i) {
118 STORE(i, j, DC);
119 }
120 }
121 }
122 #endif // !WEBP_NEON_OMIT_C_CODE
123
TransformDCUV_C(const int16_t * in,uint8_t * dst)124 static void TransformDCUV_C(const int16_t* in, uint8_t* dst) {
125 if (in[0 * 16]) VP8TransformDC(in + 0 * 16, dst);
126 if (in[1 * 16]) VP8TransformDC(in + 1 * 16, dst + 4);
127 if (in[2 * 16]) VP8TransformDC(in + 2 * 16, dst + 4 * BPS);
128 if (in[3 * 16]) VP8TransformDC(in + 3 * 16, dst + 4 * BPS + 4);
129 }
130
131 #undef STORE
132
133 //------------------------------------------------------------------------------
134 // Paragraph 14.3
135
136 #if !WEBP_NEON_OMIT_C_CODE
TransformWHT_C(const int16_t * in,int16_t * out)137 static void TransformWHT_C(const int16_t* in, int16_t* out) {
138 int tmp[16];
139 int i;
140 for (i = 0; i < 4; ++i) {
141 const int a0 = in[0 + i] + in[12 + i];
142 const int a1 = in[4 + i] + in[ 8 + i];
143 const int a2 = in[4 + i] - in[ 8 + i];
144 const int a3 = in[0 + i] - in[12 + i];
145 tmp[0 + i] = a0 + a1;
146 tmp[8 + i] = a0 - a1;
147 tmp[4 + i] = a3 + a2;
148 tmp[12 + i] = a3 - a2;
149 }
150 for (i = 0; i < 4; ++i) {
151 const int dc = tmp[0 + i * 4] + 3; // w/ rounder
152 const int a0 = dc + tmp[3 + i * 4];
153 const int a1 = tmp[1 + i * 4] + tmp[2 + i * 4];
154 const int a2 = tmp[1 + i * 4] - tmp[2 + i * 4];
155 const int a3 = dc - tmp[3 + i * 4];
156 out[ 0] = (a0 + a1) >> 3;
157 out[16] = (a3 + a2) >> 3;
158 out[32] = (a0 - a1) >> 3;
159 out[48] = (a3 - a2) >> 3;
160 out += 64;
161 }
162 }
163 #endif // !WEBP_NEON_OMIT_C_CODE
164
165 void (*VP8TransformWHT)(const int16_t* in, int16_t* out);
166
167 //------------------------------------------------------------------------------
168 // Intra predictions
169
170 #define DST(x, y) dst[(x) + (y) * BPS]
171
172 #if !WEBP_NEON_OMIT_C_CODE
TrueMotion(uint8_t * dst,int size)173 static WEBP_INLINE void TrueMotion(uint8_t* dst, int size) {
174 const uint8_t* top = dst - BPS;
175 const uint8_t* const clip0 = VP8kclip1 - top[-1];
176 int y;
177 for (y = 0; y < size; ++y) {
178 const uint8_t* const clip = clip0 + dst[-1];
179 int x;
180 for (x = 0; x < size; ++x) {
181 dst[x] = clip[top[x]];
182 }
183 dst += BPS;
184 }
185 }
TM4_C(uint8_t * dst)186 static void TM4_C(uint8_t* dst) { TrueMotion(dst, 4); }
TM8uv_C(uint8_t * dst)187 static void TM8uv_C(uint8_t* dst) { TrueMotion(dst, 8); }
TM16_C(uint8_t * dst)188 static void TM16_C(uint8_t* dst) { TrueMotion(dst, 16); }
189
190 //------------------------------------------------------------------------------
191 // 16x16
192
VE16_C(uint8_t * dst)193 static void VE16_C(uint8_t* dst) { // vertical
194 int j;
195 for (j = 0; j < 16; ++j) {
196 memcpy(dst + j * BPS, dst - BPS, 16);
197 }
198 }
199
HE16_C(uint8_t * dst)200 static void HE16_C(uint8_t* dst) { // horizontal
201 int j;
202 for (j = 16; j > 0; --j) {
203 memset(dst, dst[-1], 16);
204 dst += BPS;
205 }
206 }
207
Put16(int v,uint8_t * dst)208 static WEBP_INLINE void Put16(int v, uint8_t* dst) {
209 int j;
210 for (j = 0; j < 16; ++j) {
211 memset(dst + j * BPS, v, 16);
212 }
213 }
214
DC16_C(uint8_t * dst)215 static void DC16_C(uint8_t* dst) { // DC
216 int DC = 16;
217 int j;
218 for (j = 0; j < 16; ++j) {
219 DC += dst[-1 + j * BPS] + dst[j - BPS];
220 }
221 Put16(DC >> 5, dst);
222 }
223
DC16NoTop_C(uint8_t * dst)224 static void DC16NoTop_C(uint8_t* dst) { // DC with top samples not available
225 int DC = 8;
226 int j;
227 for (j = 0; j < 16; ++j) {
228 DC += dst[-1 + j * BPS];
229 }
230 Put16(DC >> 4, dst);
231 }
232
DC16NoLeft_C(uint8_t * dst)233 static void DC16NoLeft_C(uint8_t* dst) { // DC with left samples not available
234 int DC = 8;
235 int i;
236 for (i = 0; i < 16; ++i) {
237 DC += dst[i - BPS];
238 }
239 Put16(DC >> 4, dst);
240 }
241
DC16NoTopLeft_C(uint8_t * dst)242 static void DC16NoTopLeft_C(uint8_t* dst) { // DC with no top and left samples
243 Put16(0x80, dst);
244 }
245 #endif // !WEBP_NEON_OMIT_C_CODE
246
247 VP8PredFunc VP8PredLuma16[NUM_B_DC_MODES];
248
249 //------------------------------------------------------------------------------
250 // 4x4
251
252 #define AVG3(a, b, c) ((uint8_t)(((a) + 2 * (b) + (c) + 2) >> 2))
253 #define AVG2(a, b) (((a) + (b) + 1) >> 1)
254
255 #if !WEBP_NEON_OMIT_C_CODE
VE4_C(uint8_t * dst)256 static void VE4_C(uint8_t* dst) { // vertical
257 const uint8_t* top = dst - BPS;
258 const uint8_t vals[4] = {
259 AVG3(top[-1], top[0], top[1]),
260 AVG3(top[ 0], top[1], top[2]),
261 AVG3(top[ 1], top[2], top[3]),
262 AVG3(top[ 2], top[3], top[4])
263 };
264 int i;
265 for (i = 0; i < 4; ++i) {
266 memcpy(dst + i * BPS, vals, sizeof(vals));
267 }
268 }
269 #endif // !WEBP_NEON_OMIT_C_CODE
270
HE4_C(uint8_t * dst)271 static void HE4_C(uint8_t* dst) { // horizontal
272 const int A = dst[-1 - BPS];
273 const int B = dst[-1];
274 const int C = dst[-1 + BPS];
275 const int D = dst[-1 + 2 * BPS];
276 const int E = dst[-1 + 3 * BPS];
277 WebPUint32ToMem(dst + 0 * BPS, 0x01010101U * AVG3(A, B, C));
278 WebPUint32ToMem(dst + 1 * BPS, 0x01010101U * AVG3(B, C, D));
279 WebPUint32ToMem(dst + 2 * BPS, 0x01010101U * AVG3(C, D, E));
280 WebPUint32ToMem(dst + 3 * BPS, 0x01010101U * AVG3(D, E, E));
281 }
282
283 #if !WEBP_NEON_OMIT_C_CODE
DC4_C(uint8_t * dst)284 static void DC4_C(uint8_t* dst) { // DC
285 uint32_t dc = 4;
286 int i;
287 for (i = 0; i < 4; ++i) dc += dst[i - BPS] + dst[-1 + i * BPS];
288 dc >>= 3;
289 for (i = 0; i < 4; ++i) memset(dst + i * BPS, dc, 4);
290 }
291
RD4_C(uint8_t * dst)292 static void RD4_C(uint8_t* dst) { // Down-right
293 const int I = dst[-1 + 0 * BPS];
294 const int J = dst[-1 + 1 * BPS];
295 const int K = dst[-1 + 2 * BPS];
296 const int L = dst[-1 + 3 * BPS];
297 const int X = dst[-1 - BPS];
298 const int A = dst[0 - BPS];
299 const int B = dst[1 - BPS];
300 const int C = dst[2 - BPS];
301 const int D = dst[3 - BPS];
302 DST(0, 3) = AVG3(J, K, L);
303 DST(1, 3) = DST(0, 2) = AVG3(I, J, K);
304 DST(2, 3) = DST(1, 2) = DST(0, 1) = AVG3(X, I, J);
305 DST(3, 3) = DST(2, 2) = DST(1, 1) = DST(0, 0) = AVG3(A, X, I);
306 DST(3, 2) = DST(2, 1) = DST(1, 0) = AVG3(B, A, X);
307 DST(3, 1) = DST(2, 0) = AVG3(C, B, A);
308 DST(3, 0) = AVG3(D, C, B);
309 }
310
LD4_C(uint8_t * dst)311 static void LD4_C(uint8_t* dst) { // Down-Left
312 const int A = dst[0 - BPS];
313 const int B = dst[1 - BPS];
314 const int C = dst[2 - BPS];
315 const int D = dst[3 - BPS];
316 const int E = dst[4 - BPS];
317 const int F = dst[5 - BPS];
318 const int G = dst[6 - BPS];
319 const int H = dst[7 - BPS];
320 DST(0, 0) = AVG3(A, B, C);
321 DST(1, 0) = DST(0, 1) = AVG3(B, C, D);
322 DST(2, 0) = DST(1, 1) = DST(0, 2) = AVG3(C, D, E);
323 DST(3, 0) = DST(2, 1) = DST(1, 2) = DST(0, 3) = AVG3(D, E, F);
324 DST(3, 1) = DST(2, 2) = DST(1, 3) = AVG3(E, F, G);
325 DST(3, 2) = DST(2, 3) = AVG3(F, G, H);
326 DST(3, 3) = AVG3(G, H, H);
327 }
328 #endif // !WEBP_NEON_OMIT_C_CODE
329
VR4_C(uint8_t * dst)330 static void VR4_C(uint8_t* dst) { // Vertical-Right
331 const int I = dst[-1 + 0 * BPS];
332 const int J = dst[-1 + 1 * BPS];
333 const int K = dst[-1 + 2 * BPS];
334 const int X = dst[-1 - BPS];
335 const int A = dst[0 - BPS];
336 const int B = dst[1 - BPS];
337 const int C = dst[2 - BPS];
338 const int D = dst[3 - BPS];
339 DST(0, 0) = DST(1, 2) = AVG2(X, A);
340 DST(1, 0) = DST(2, 2) = AVG2(A, B);
341 DST(2, 0) = DST(3, 2) = AVG2(B, C);
342 DST(3, 0) = AVG2(C, D);
343
344 DST(0, 3) = AVG3(K, J, I);
345 DST(0, 2) = AVG3(J, I, X);
346 DST(0, 1) = DST(1, 3) = AVG3(I, X, A);
347 DST(1, 1) = DST(2, 3) = AVG3(X, A, B);
348 DST(2, 1) = DST(3, 3) = AVG3(A, B, C);
349 DST(3, 1) = AVG3(B, C, D);
350 }
351
VL4_C(uint8_t * dst)352 static void VL4_C(uint8_t* dst) { // Vertical-Left
353 const int A = dst[0 - BPS];
354 const int B = dst[1 - BPS];
355 const int C = dst[2 - BPS];
356 const int D = dst[3 - BPS];
357 const int E = dst[4 - BPS];
358 const int F = dst[5 - BPS];
359 const int G = dst[6 - BPS];
360 const int H = dst[7 - BPS];
361 DST(0, 0) = AVG2(A, B);
362 DST(1, 0) = DST(0, 2) = AVG2(B, C);
363 DST(2, 0) = DST(1, 2) = AVG2(C, D);
364 DST(3, 0) = DST(2, 2) = AVG2(D, E);
365
366 DST(0, 1) = AVG3(A, B, C);
367 DST(1, 1) = DST(0, 3) = AVG3(B, C, D);
368 DST(2, 1) = DST(1, 3) = AVG3(C, D, E);
369 DST(3, 1) = DST(2, 3) = AVG3(D, E, F);
370 DST(3, 2) = AVG3(E, F, G);
371 DST(3, 3) = AVG3(F, G, H);
372 }
373
HU4_C(uint8_t * dst)374 static void HU4_C(uint8_t* dst) { // Horizontal-Up
375 const int I = dst[-1 + 0 * BPS];
376 const int J = dst[-1 + 1 * BPS];
377 const int K = dst[-1 + 2 * BPS];
378 const int L = dst[-1 + 3 * BPS];
379 DST(0, 0) = AVG2(I, J);
380 DST(2, 0) = DST(0, 1) = AVG2(J, K);
381 DST(2, 1) = DST(0, 2) = AVG2(K, L);
382 DST(1, 0) = AVG3(I, J, K);
383 DST(3, 0) = DST(1, 1) = AVG3(J, K, L);
384 DST(3, 1) = DST(1, 2) = AVG3(K, L, L);
385 DST(3, 2) = DST(2, 2) =
386 DST(0, 3) = DST(1, 3) = DST(2, 3) = DST(3, 3) = L;
387 }
388
HD4_C(uint8_t * dst)389 static void HD4_C(uint8_t* dst) { // Horizontal-Down
390 const int I = dst[-1 + 0 * BPS];
391 const int J = dst[-1 + 1 * BPS];
392 const int K = dst[-1 + 2 * BPS];
393 const int L = dst[-1 + 3 * BPS];
394 const int X = dst[-1 - BPS];
395 const int A = dst[0 - BPS];
396 const int B = dst[1 - BPS];
397 const int C = dst[2 - BPS];
398
399 DST(0, 0) = DST(2, 1) = AVG2(I, X);
400 DST(0, 1) = DST(2, 2) = AVG2(J, I);
401 DST(0, 2) = DST(2, 3) = AVG2(K, J);
402 DST(0, 3) = AVG2(L, K);
403
404 DST(3, 0) = AVG3(A, B, C);
405 DST(2, 0) = AVG3(X, A, B);
406 DST(1, 0) = DST(3, 1) = AVG3(I, X, A);
407 DST(1, 1) = DST(3, 2) = AVG3(J, I, X);
408 DST(1, 2) = DST(3, 3) = AVG3(K, J, I);
409 DST(1, 3) = AVG3(L, K, J);
410 }
411
412 #undef DST
413 #undef AVG3
414 #undef AVG2
415
416 VP8PredFunc VP8PredLuma4[NUM_BMODES];
417
418 //------------------------------------------------------------------------------
419 // Chroma
420
421 #if !WEBP_NEON_OMIT_C_CODE
VE8uv_C(uint8_t * dst)422 static void VE8uv_C(uint8_t* dst) { // vertical
423 int j;
424 for (j = 0; j < 8; ++j) {
425 memcpy(dst + j * BPS, dst - BPS, 8);
426 }
427 }
428
HE8uv_C(uint8_t * dst)429 static void HE8uv_C(uint8_t* dst) { // horizontal
430 int j;
431 for (j = 0; j < 8; ++j) {
432 memset(dst, dst[-1], 8);
433 dst += BPS;
434 }
435 }
436
437 // helper for chroma-DC predictions
Put8x8uv(uint8_t value,uint8_t * dst)438 static WEBP_INLINE void Put8x8uv(uint8_t value, uint8_t* dst) {
439 int j;
440 for (j = 0; j < 8; ++j) {
441 memset(dst + j * BPS, value, 8);
442 }
443 }
444
DC8uv_C(uint8_t * dst)445 static void DC8uv_C(uint8_t* dst) { // DC
446 int dc0 = 8;
447 int i;
448 for (i = 0; i < 8; ++i) {
449 dc0 += dst[i - BPS] + dst[-1 + i * BPS];
450 }
451 Put8x8uv(dc0 >> 4, dst);
452 }
453
DC8uvNoLeft_C(uint8_t * dst)454 static void DC8uvNoLeft_C(uint8_t* dst) { // DC with no left samples
455 int dc0 = 4;
456 int i;
457 for (i = 0; i < 8; ++i) {
458 dc0 += dst[i - BPS];
459 }
460 Put8x8uv(dc0 >> 3, dst);
461 }
462
DC8uvNoTop_C(uint8_t * dst)463 static void DC8uvNoTop_C(uint8_t* dst) { // DC with no top samples
464 int dc0 = 4;
465 int i;
466 for (i = 0; i < 8; ++i) {
467 dc0 += dst[-1 + i * BPS];
468 }
469 Put8x8uv(dc0 >> 3, dst);
470 }
471
DC8uvNoTopLeft_C(uint8_t * dst)472 static void DC8uvNoTopLeft_C(uint8_t* dst) { // DC with nothing
473 Put8x8uv(0x80, dst);
474 }
475 #endif // !WEBP_NEON_OMIT_C_CODE
476
477 VP8PredFunc VP8PredChroma8[NUM_B_DC_MODES];
478
479 //------------------------------------------------------------------------------
480 // Edge filtering functions
481
482 #if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
483 // 4 pixels in, 2 pixels out
DoFilter2_C(uint8_t * p,int step)484 static WEBP_INLINE void DoFilter2_C(uint8_t* p, int step) {
485 const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
486 const int a = 3 * (q0 - p0) + VP8ksclip1[p1 - q1]; // in [-893,892]
487 const int a1 = VP8ksclip2[(a + 4) >> 3]; // in [-16,15]
488 const int a2 = VP8ksclip2[(a + 3) >> 3];
489 p[-step] = VP8kclip1[p0 + a2];
490 p[ 0] = VP8kclip1[q0 - a1];
491 }
492
493 // 4 pixels in, 4 pixels out
DoFilter4_C(uint8_t * p,int step)494 static WEBP_INLINE void DoFilter4_C(uint8_t* p, int step) {
495 const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
496 const int a = 3 * (q0 - p0);
497 const int a1 = VP8ksclip2[(a + 4) >> 3];
498 const int a2 = VP8ksclip2[(a + 3) >> 3];
499 const int a3 = (a1 + 1) >> 1;
500 p[-2*step] = VP8kclip1[p1 + a3];
501 p[- step] = VP8kclip1[p0 + a2];
502 p[ 0] = VP8kclip1[q0 - a1];
503 p[ step] = VP8kclip1[q1 - a3];
504 }
505
506 // 6 pixels in, 6 pixels out
DoFilter6_C(uint8_t * p,int step)507 static WEBP_INLINE void DoFilter6_C(uint8_t* p, int step) {
508 const int p2 = p[-3*step], p1 = p[-2*step], p0 = p[-step];
509 const int q0 = p[0], q1 = p[step], q2 = p[2*step];
510 const int a = VP8ksclip1[3 * (q0 - p0) + VP8ksclip1[p1 - q1]];
511 // a is in [-128,127], a1 in [-27,27], a2 in [-18,18] and a3 in [-9,9]
512 const int a1 = (27 * a + 63) >> 7; // eq. to ((3 * a + 7) * 9) >> 7
513 const int a2 = (18 * a + 63) >> 7; // eq. to ((2 * a + 7) * 9) >> 7
514 const int a3 = (9 * a + 63) >> 7; // eq. to ((1 * a + 7) * 9) >> 7
515 p[-3*step] = VP8kclip1[p2 + a3];
516 p[-2*step] = VP8kclip1[p1 + a2];
517 p[- step] = VP8kclip1[p0 + a1];
518 p[ 0] = VP8kclip1[q0 - a1];
519 p[ step] = VP8kclip1[q1 - a2];
520 p[ 2*step] = VP8kclip1[q2 - a3];
521 }
522
Hev(const uint8_t * p,int step,int thresh)523 static WEBP_INLINE int Hev(const uint8_t* p, int step, int thresh) {
524 const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
525 return (VP8kabs0[p1 - p0] > thresh) || (VP8kabs0[q1 - q0] > thresh);
526 }
527 #endif // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
528
529 #if !WEBP_NEON_OMIT_C_CODE
NeedsFilter_C(const uint8_t * p,int step,int t)530 static WEBP_INLINE int NeedsFilter_C(const uint8_t* p, int step, int t) {
531 const int p1 = p[-2 * step], p0 = p[-step], q0 = p[0], q1 = p[step];
532 return ((4 * VP8kabs0[p0 - q0] + VP8kabs0[p1 - q1]) <= t);
533 }
534 #endif // !WEBP_NEON_OMIT_C_CODE
535
536 #if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
NeedsFilter2_C(const uint8_t * p,int step,int t,int it)537 static WEBP_INLINE int NeedsFilter2_C(const uint8_t* p,
538 int step, int t, int it) {
539 const int p3 = p[-4 * step], p2 = p[-3 * step], p1 = p[-2 * step];
540 const int p0 = p[-step], q0 = p[0];
541 const int q1 = p[step], q2 = p[2 * step], q3 = p[3 * step];
542 if ((4 * VP8kabs0[p0 - q0] + VP8kabs0[p1 - q1]) > t) return 0;
543 return VP8kabs0[p3 - p2] <= it && VP8kabs0[p2 - p1] <= it &&
544 VP8kabs0[p1 - p0] <= it && VP8kabs0[q3 - q2] <= it &&
545 VP8kabs0[q2 - q1] <= it && VP8kabs0[q1 - q0] <= it;
546 }
547 #endif // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
548
549 //------------------------------------------------------------------------------
550 // Simple In-loop filtering (Paragraph 15.2)
551
552 #if !WEBP_NEON_OMIT_C_CODE
SimpleVFilter16_C(uint8_t * p,int stride,int thresh)553 static void SimpleVFilter16_C(uint8_t* p, int stride, int thresh) {
554 int i;
555 const int thresh2 = 2 * thresh + 1;
556 for (i = 0; i < 16; ++i) {
557 if (NeedsFilter_C(p + i, stride, thresh2)) {
558 DoFilter2_C(p + i, stride);
559 }
560 }
561 }
562
SimpleHFilter16_C(uint8_t * p,int stride,int thresh)563 static void SimpleHFilter16_C(uint8_t* p, int stride, int thresh) {
564 int i;
565 const int thresh2 = 2 * thresh + 1;
566 for (i = 0; i < 16; ++i) {
567 if (NeedsFilter_C(p + i * stride, 1, thresh2)) {
568 DoFilter2_C(p + i * stride, 1);
569 }
570 }
571 }
572
SimpleVFilter16i_C(uint8_t * p,int stride,int thresh)573 static void SimpleVFilter16i_C(uint8_t* p, int stride, int thresh) {
574 int k;
575 for (k = 3; k > 0; --k) {
576 p += 4 * stride;
577 SimpleVFilter16_C(p, stride, thresh);
578 }
579 }
580
SimpleHFilter16i_C(uint8_t * p,int stride,int thresh)581 static void SimpleHFilter16i_C(uint8_t* p, int stride, int thresh) {
582 int k;
583 for (k = 3; k > 0; --k) {
584 p += 4;
585 SimpleHFilter16_C(p, stride, thresh);
586 }
587 }
588 #endif // !WEBP_NEON_OMIT_C_CODE
589
590 //------------------------------------------------------------------------------
591 // Complex In-loop filtering (Paragraph 15.3)
592
593 #if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
FilterLoop26_C(uint8_t * p,int hstride,int vstride,int size,int thresh,int ithresh,int hev_thresh)594 static WEBP_INLINE void FilterLoop26_C(uint8_t* p,
595 int hstride, int vstride, int size,
596 int thresh, int ithresh,
597 int hev_thresh) {
598 const int thresh2 = 2 * thresh + 1;
599 while (size-- > 0) {
600 if (NeedsFilter2_C(p, hstride, thresh2, ithresh)) {
601 if (Hev(p, hstride, hev_thresh)) {
602 DoFilter2_C(p, hstride);
603 } else {
604 DoFilter6_C(p, hstride);
605 }
606 }
607 p += vstride;
608 }
609 }
610
FilterLoop24_C(uint8_t * p,int hstride,int vstride,int size,int thresh,int ithresh,int hev_thresh)611 static WEBP_INLINE void FilterLoop24_C(uint8_t* p,
612 int hstride, int vstride, int size,
613 int thresh, int ithresh,
614 int hev_thresh) {
615 const int thresh2 = 2 * thresh + 1;
616 while (size-- > 0) {
617 if (NeedsFilter2_C(p, hstride, thresh2, ithresh)) {
618 if (Hev(p, hstride, hev_thresh)) {
619 DoFilter2_C(p, hstride);
620 } else {
621 DoFilter4_C(p, hstride);
622 }
623 }
624 p += vstride;
625 }
626 }
627 #endif // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
628
629 #if !WEBP_NEON_OMIT_C_CODE
630 // on macroblock edges
VFilter16_C(uint8_t * p,int stride,int thresh,int ithresh,int hev_thresh)631 static void VFilter16_C(uint8_t* p, int stride,
632 int thresh, int ithresh, int hev_thresh) {
633 FilterLoop26_C(p, stride, 1, 16, thresh, ithresh, hev_thresh);
634 }
635
HFilter16_C(uint8_t * p,int stride,int thresh,int ithresh,int hev_thresh)636 static void HFilter16_C(uint8_t* p, int stride,
637 int thresh, int ithresh, int hev_thresh) {
638 FilterLoop26_C(p, 1, stride, 16, thresh, ithresh, hev_thresh);
639 }
640
641 // on three inner edges
VFilter16i_C(uint8_t * p,int stride,int thresh,int ithresh,int hev_thresh)642 static void VFilter16i_C(uint8_t* p, int stride,
643 int thresh, int ithresh, int hev_thresh) {
644 int k;
645 for (k = 3; k > 0; --k) {
646 p += 4 * stride;
647 FilterLoop24_C(p, stride, 1, 16, thresh, ithresh, hev_thresh);
648 }
649 }
650 #endif // !WEBP_NEON_OMIT_C_CODE
651
652 #if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
HFilter16i_C(uint8_t * p,int stride,int thresh,int ithresh,int hev_thresh)653 static void HFilter16i_C(uint8_t* p, int stride,
654 int thresh, int ithresh, int hev_thresh) {
655 int k;
656 for (k = 3; k > 0; --k) {
657 p += 4;
658 FilterLoop24_C(p, 1, stride, 16, thresh, ithresh, hev_thresh);
659 }
660 }
661 #endif // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
662
663 #if !WEBP_NEON_OMIT_C_CODE
664 // 8-pixels wide variant, for chroma filtering
VFilter8_C(uint8_t * u,uint8_t * v,int stride,int thresh,int ithresh,int hev_thresh)665 static void VFilter8_C(uint8_t* u, uint8_t* v, int stride,
666 int thresh, int ithresh, int hev_thresh) {
667 FilterLoop26_C(u, stride, 1, 8, thresh, ithresh, hev_thresh);
668 FilterLoop26_C(v, stride, 1, 8, thresh, ithresh, hev_thresh);
669 }
670 #endif // !WEBP_NEON_OMIT_C_CODE
671
672 #if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
HFilter8_C(uint8_t * u,uint8_t * v,int stride,int thresh,int ithresh,int hev_thresh)673 static void HFilter8_C(uint8_t* u, uint8_t* v, int stride,
674 int thresh, int ithresh, int hev_thresh) {
675 FilterLoop26_C(u, 1, stride, 8, thresh, ithresh, hev_thresh);
676 FilterLoop26_C(v, 1, stride, 8, thresh, ithresh, hev_thresh);
677 }
678 #endif // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
679
680 #if !WEBP_NEON_OMIT_C_CODE
VFilter8i_C(uint8_t * u,uint8_t * v,int stride,int thresh,int ithresh,int hev_thresh)681 static void VFilter8i_C(uint8_t* u, uint8_t* v, int stride,
682 int thresh, int ithresh, int hev_thresh) {
683 FilterLoop24_C(u + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh);
684 FilterLoop24_C(v + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh);
685 }
686 #endif // !WEBP_NEON_OMIT_C_CODE
687
688 #if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
HFilter8i_C(uint8_t * u,uint8_t * v,int stride,int thresh,int ithresh,int hev_thresh)689 static void HFilter8i_C(uint8_t* u, uint8_t* v, int stride,
690 int thresh, int ithresh, int hev_thresh) {
691 FilterLoop24_C(u + 4, 1, stride, 8, thresh, ithresh, hev_thresh);
692 FilterLoop24_C(v + 4, 1, stride, 8, thresh, ithresh, hev_thresh);
693 }
694 #endif // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
695
696 //------------------------------------------------------------------------------
697
DitherCombine8x8_C(const uint8_t * dither,uint8_t * dst,int dst_stride)698 static void DitherCombine8x8_C(const uint8_t* dither, uint8_t* dst,
699 int dst_stride) {
700 int i, j;
701 for (j = 0; j < 8; ++j) {
702 for (i = 0; i < 8; ++i) {
703 const int delta0 = dither[i] - VP8_DITHER_AMP_CENTER;
704 const int delta1 =
705 (delta0 + VP8_DITHER_DESCALE_ROUNDER) >> VP8_DITHER_DESCALE;
706 dst[i] = clip_8b((int)dst[i] + delta1);
707 }
708 dst += dst_stride;
709 dither += 8;
710 }
711 }
712
713 //------------------------------------------------------------------------------
714
715 VP8DecIdct2 VP8Transform;
716 VP8DecIdct VP8TransformAC3;
717 VP8DecIdct VP8TransformUV;
718 VP8DecIdct VP8TransformDC;
719 VP8DecIdct VP8TransformDCUV;
720
721 VP8LumaFilterFunc VP8VFilter16;
722 VP8LumaFilterFunc VP8HFilter16;
723 VP8ChromaFilterFunc VP8VFilter8;
724 VP8ChromaFilterFunc VP8HFilter8;
725 VP8LumaFilterFunc VP8VFilter16i;
726 VP8LumaFilterFunc VP8HFilter16i;
727 VP8ChromaFilterFunc VP8VFilter8i;
728 VP8ChromaFilterFunc VP8HFilter8i;
729 VP8SimpleFilterFunc VP8SimpleVFilter16;
730 VP8SimpleFilterFunc VP8SimpleHFilter16;
731 VP8SimpleFilterFunc VP8SimpleVFilter16i;
732 VP8SimpleFilterFunc VP8SimpleHFilter16i;
733
734 void (*VP8DitherCombine8x8)(const uint8_t* dither, uint8_t* dst,
735 int dst_stride);
736
737 extern void VP8DspInitSSE2(void);
738 extern void VP8DspInitSSE41(void);
739 extern void VP8DspInitNEON(void);
740 extern void VP8DspInitMIPS32(void);
741 extern void VP8DspInitMIPSdspR2(void);
742 extern void VP8DspInitMSA(void);
743
WEBP_DSP_INIT_FUNC(VP8DspInit)744 WEBP_DSP_INIT_FUNC(VP8DspInit) {
745 VP8InitClipTables();
746
747 #if !WEBP_NEON_OMIT_C_CODE
748 VP8TransformWHT = TransformWHT_C;
749 VP8Transform = TransformTwo_C;
750 VP8TransformDC = TransformDC_C;
751 VP8TransformAC3 = TransformAC3_C;
752 #endif
753 VP8TransformUV = TransformUV_C;
754 VP8TransformDCUV = TransformDCUV_C;
755
756 #if !WEBP_NEON_OMIT_C_CODE
757 VP8VFilter16 = VFilter16_C;
758 VP8VFilter16i = VFilter16i_C;
759 VP8HFilter16 = HFilter16_C;
760 VP8VFilter8 = VFilter8_C;
761 VP8VFilter8i = VFilter8i_C;
762 VP8SimpleVFilter16 = SimpleVFilter16_C;
763 VP8SimpleHFilter16 = SimpleHFilter16_C;
764 VP8SimpleVFilter16i = SimpleVFilter16i_C;
765 VP8SimpleHFilter16i = SimpleHFilter16i_C;
766 #endif
767
768 #if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
769 VP8HFilter16i = HFilter16i_C;
770 VP8HFilter8 = HFilter8_C;
771 VP8HFilter8i = HFilter8i_C;
772 #endif
773
774 #if !WEBP_NEON_OMIT_C_CODE
775 VP8PredLuma4[0] = DC4_C;
776 VP8PredLuma4[1] = TM4_C;
777 VP8PredLuma4[2] = VE4_C;
778 VP8PredLuma4[4] = RD4_C;
779 VP8PredLuma4[6] = LD4_C;
780 #endif
781
782 VP8PredLuma4[3] = HE4_C;
783 VP8PredLuma4[5] = VR4_C;
784 VP8PredLuma4[7] = VL4_C;
785 VP8PredLuma4[8] = HD4_C;
786 VP8PredLuma4[9] = HU4_C;
787
788 #if !WEBP_NEON_OMIT_C_CODE
789 VP8PredLuma16[0] = DC16_C;
790 VP8PredLuma16[1] = TM16_C;
791 VP8PredLuma16[2] = VE16_C;
792 VP8PredLuma16[3] = HE16_C;
793 VP8PredLuma16[4] = DC16NoTop_C;
794 VP8PredLuma16[5] = DC16NoLeft_C;
795 VP8PredLuma16[6] = DC16NoTopLeft_C;
796
797 VP8PredChroma8[0] = DC8uv_C;
798 VP8PredChroma8[1] = TM8uv_C;
799 VP8PredChroma8[2] = VE8uv_C;
800 VP8PredChroma8[3] = HE8uv_C;
801 VP8PredChroma8[4] = DC8uvNoTop_C;
802 VP8PredChroma8[5] = DC8uvNoLeft_C;
803 VP8PredChroma8[6] = DC8uvNoTopLeft_C;
804 #endif
805
806 VP8DitherCombine8x8 = DitherCombine8x8_C;
807
808 // If defined, use CPUInfo() to overwrite some pointers with faster versions.
809 if (VP8GetCPUInfo != NULL) {
810 #if defined(WEBP_HAVE_SSE2)
811 if (VP8GetCPUInfo(kSSE2)) {
812 VP8DspInitSSE2();
813 #if defined(WEBP_HAVE_SSE41)
814 if (VP8GetCPUInfo(kSSE4_1)) {
815 VP8DspInitSSE41();
816 }
817 #endif
818 }
819 #endif
820 #if defined(WEBP_USE_MIPS32)
821 if (VP8GetCPUInfo(kMIPS32)) {
822 VP8DspInitMIPS32();
823 }
824 #endif
825 #if defined(WEBP_USE_MIPS_DSP_R2)
826 if (VP8GetCPUInfo(kMIPSdspR2)) {
827 VP8DspInitMIPSdspR2();
828 }
829 #endif
830 #if defined(WEBP_USE_MSA)
831 if (VP8GetCPUInfo(kMSA)) {
832 VP8DspInitMSA();
833 }
834 #endif
835 }
836
837 #if defined(WEBP_HAVE_NEON)
838 if (WEBP_NEON_OMIT_C_CODE ||
839 (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
840 VP8DspInitNEON();
841 }
842 #endif
843
844 assert(VP8TransformWHT != NULL);
845 assert(VP8Transform != NULL);
846 assert(VP8TransformDC != NULL);
847 assert(VP8TransformAC3 != NULL);
848 assert(VP8TransformUV != NULL);
849 assert(VP8TransformDCUV != NULL);
850 assert(VP8VFilter16 != NULL);
851 assert(VP8HFilter16 != NULL);
852 assert(VP8VFilter8 != NULL);
853 assert(VP8HFilter8 != NULL);
854 assert(VP8VFilter16i != NULL);
855 assert(VP8HFilter16i != NULL);
856 assert(VP8VFilter8i != NULL);
857 assert(VP8HFilter8i != NULL);
858 assert(VP8SimpleVFilter16 != NULL);
859 assert(VP8SimpleHFilter16 != NULL);
860 assert(VP8SimpleVFilter16i != NULL);
861 assert(VP8SimpleHFilter16i != NULL);
862 assert(VP8PredLuma4[0] != NULL);
863 assert(VP8PredLuma4[1] != NULL);
864 assert(VP8PredLuma4[2] != NULL);
865 assert(VP8PredLuma4[3] != NULL);
866 assert(VP8PredLuma4[4] != NULL);
867 assert(VP8PredLuma4[5] != NULL);
868 assert(VP8PredLuma4[6] != NULL);
869 assert(VP8PredLuma4[7] != NULL);
870 assert(VP8PredLuma4[8] != NULL);
871 assert(VP8PredLuma4[9] != NULL);
872 assert(VP8PredLuma16[0] != NULL);
873 assert(VP8PredLuma16[1] != NULL);
874 assert(VP8PredLuma16[2] != NULL);
875 assert(VP8PredLuma16[3] != NULL);
876 assert(VP8PredLuma16[4] != NULL);
877 assert(VP8PredLuma16[5] != NULL);
878 assert(VP8PredLuma16[6] != NULL);
879 assert(VP8PredChroma8[0] != NULL);
880 assert(VP8PredChroma8[1] != NULL);
881 assert(VP8PredChroma8[2] != NULL);
882 assert(VP8PredChroma8[3] != NULL);
883 assert(VP8PredChroma8[4] != NULL);
884 assert(VP8PredChroma8[5] != NULL);
885 assert(VP8PredChroma8[6] != NULL);
886 assert(VP8DitherCombine8x8 != NULL);
887 }
888