summaryrefslogtreecommitdiffstats
path: root/media/libwebp/src/dsp/upsampling.c
blob: 87f771f3eb51bbee6b53a29ac14fe24d56a6b264 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
// 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.
// -----------------------------------------------------------------------------
//
// YUV to RGB upsampling functions.
//
// Author: somnath@google.com (Somnath Banerjee)

#include "src/dsp/dsp.h"
#include "src/dsp/yuv.h"

#include <assert.h>

//------------------------------------------------------------------------------
// Fancy upsampler

#ifdef FANCY_UPSAMPLING

// Fancy upsampling functions to convert YUV to RGB
WebPUpsampleLinePairFunc WebPUpsamplers[MODE_LAST];

// Given samples laid out in a square as:
//  [a b]
//  [c d]
// we interpolate u/v as:
//  ([9*a + 3*b + 3*c +   d    3*a + 9*b + 3*c +   d] + [8 8]) / 16
//  ([3*a +   b + 9*c + 3*d      a + 3*b + 3*c + 9*d]   [8 8]) / 16

// We process u and v together stashed into 32bit (16bit each).
#define LOAD_UV(u, v) ((u) | ((v) << 16))

#define 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 x;                                                                       \
  const int last_pixel_pair = (len - 1) >> 1;                                  \
  uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]);   /* top-left sample */        \
  uint32_t l_uv  = LOAD_UV(cur_u[0], cur_v[0]);   /* left-sample */            \
  assert(top_y != NULL);                                                       \
  {                                                                            \
    const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2;                \
    FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst);                          \
  }                                                                            \
  if (bottom_y != NULL) {                                                      \
    const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2;                \
    FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst);                    \
  }                                                                            \
  for (x = 1; x <= last_pixel_pair; ++x) {                                     \
    const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]);  /* top sample */       \
    const uint32_t uv   = LOAD_UV(cur_u[x], cur_v[x]);  /* sample */           \
    /* precompute invariant values associated with first and second diagonals*/\
    const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u;               \
    const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3;                   \
    const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3;                    \
    {                                                                          \
      const uint32_t uv0 = (diag_12 + tl_uv) >> 1;                             \
      const uint32_t uv1 = (diag_03 + t_uv) >> 1;                              \
      FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16),                          \
           top_dst + (2 * x - 1) * (XSTEP));                                   \
      FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16),                          \
           top_dst + (2 * x - 0) * (XSTEP));                                   \
    }                                                                          \
    if (bottom_y != NULL) {                                                    \
      const uint32_t uv0 = (diag_03 + l_uv) >> 1;                              \
      const uint32_t uv1 = (diag_12 + uv) >> 1;                                \
      FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16),                       \
           bottom_dst + (2 * x - 1) * (XSTEP));                                \
      FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16),                       \
           bottom_dst + (2 * x + 0) * (XSTEP));                                \
    }                                                                          \
    tl_uv = t_uv;                                                              \
    l_uv = uv;                                                                 \
  }                                                                            \
  if (!(len & 1)) {                                                            \
    {                                                                          \
      const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2;              \
      FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16),                            \
           top_dst + (len - 1) * (XSTEP));                                     \
    }                                                                          \
    if (bottom_y != NULL) {                                                    \
      const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2;              \
      FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16),                         \
           bottom_dst + (len - 1) * (XSTEP));                                  \
    }                                                                          \
  }                                                                            \
}

// All variants implemented.
#if !WEBP_NEON_OMIT_C_CODE
UPSAMPLE_FUNC(UpsampleRgbaLinePair_C, VP8YuvToRgba, 4)
UPSAMPLE_FUNC(UpsampleBgraLinePair_C, VP8YuvToBgra, 4)
#if !defined(WEBP_REDUCE_CSP)
UPSAMPLE_FUNC(UpsampleArgbLinePair_C, VP8YuvToArgb, 4)
UPSAMPLE_FUNC(UpsampleRgbLinePair_C,  VP8YuvToRgb,  3)
UPSAMPLE_FUNC(UpsampleBgrLinePair_C,  VP8YuvToBgr,  3)
UPSAMPLE_FUNC(UpsampleRgba4444LinePair_C, VP8YuvToRgba4444, 2)
UPSAMPLE_FUNC(UpsampleRgb565LinePair_C,  VP8YuvToRgb565,  2)
#else
static void EmptyUpsampleFunc(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) {
  (void)top_y;
  (void)bottom_y;
  (void)top_u;
  (void)top_v;
  (void)cur_u;
  (void)cur_v;
  (void)top_dst;
  (void)bottom_dst;
  (void)len;
  assert(0);   // COLORSPACE SUPPORT NOT COMPILED
}
#define UpsampleArgbLinePair_C EmptyUpsampleFunc
#define UpsampleRgbLinePair_C EmptyUpsampleFunc
#define UpsampleBgrLinePair_C EmptyUpsampleFunc
#define UpsampleRgba4444LinePair_C EmptyUpsampleFunc
#define UpsampleRgb565LinePair_C EmptyUpsampleFunc
#endif   // WEBP_REDUCE_CSP

#endif

#undef LOAD_UV
#undef UPSAMPLE_FUNC

#endif  // FANCY_UPSAMPLING

//------------------------------------------------------------------------------

#if !defined(FANCY_UPSAMPLING)
#define DUAL_SAMPLE_FUNC(FUNC_NAME, FUNC)                                      \
static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bot_y,              \
                      const uint8_t* top_u, const uint8_t* top_v,              \
                      const uint8_t* bot_u, const uint8_t* bot_v,              \
                      uint8_t* top_dst, uint8_t* bot_dst, int len) {           \
  const int half_len = len >> 1;                                               \
  int x;                                                                       \
  assert(top_dst != NULL);                                                     \
  {                                                                            \
    for (x = 0; x < half_len; ++x) {                                           \
      FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x + 0);         \
      FUNC(top_y[2 * x + 1], top_u[x], top_v[x], top_dst + 8 * x + 4);         \
    }                                                                          \
    if (len & 1) FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x);  \
  }                                                                            \
  if (bot_dst != NULL) {                                                       \
    for (x = 0; x < half_len; ++x) {                                           \
      FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x + 0);         \
      FUNC(bot_y[2 * x + 1], bot_u[x], bot_v[x], bot_dst + 8 * x + 4);         \
    }                                                                          \
    if (len & 1) FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x);  \
  }                                                                            \
}

DUAL_SAMPLE_FUNC(DualLineSamplerBGRA, VP8YuvToBgra)
DUAL_SAMPLE_FUNC(DualLineSamplerARGB, VP8YuvToArgb)
#undef DUAL_SAMPLE_FUNC

#endif  // !FANCY_UPSAMPLING

WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last) {
  WebPInitUpsamplers();
#ifdef FANCY_UPSAMPLING
  return WebPUpsamplers[alpha_is_last ? MODE_BGRA : MODE_ARGB];
#else
  return (alpha_is_last ? DualLineSamplerBGRA : DualLineSamplerARGB);
#endif
}

//------------------------------------------------------------------------------
// YUV444 converter

#define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP)                                    \
extern void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v,    \
                      uint8_t* dst, int len);                                  \
void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v,           \
               uint8_t* dst, int len) {                                        \
  int i;                                                                       \
  for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * (XSTEP)]);         \
}

YUV444_FUNC(WebPYuv444ToRgba_C,     VP8YuvToRgba, 4)
YUV444_FUNC(WebPYuv444ToBgra_C,     VP8YuvToBgra, 4)
#if !defined(WEBP_REDUCE_CSP)
YUV444_FUNC(WebPYuv444ToRgb_C,      VP8YuvToRgb,  3)
YUV444_FUNC(WebPYuv444ToBgr_C,      VP8YuvToBgr,  3)
YUV444_FUNC(WebPYuv444ToArgb_C,     VP8YuvToArgb, 4)
YUV444_FUNC(WebPYuv444ToRgba4444_C, VP8YuvToRgba4444, 2)
YUV444_FUNC(WebPYuv444ToRgb565_C,   VP8YuvToRgb565, 2)
#else
static void EmptyYuv444Func(const uint8_t* y,
                            const uint8_t* u, const uint8_t* v,
                            uint8_t* dst, int len) {
  (void)y;
  (void)u;
  (void)v;
  (void)dst;
  (void)len;
}
#define WebPYuv444ToRgb_C EmptyYuv444Func
#define WebPYuv444ToBgr_C EmptyYuv444Func
#define WebPYuv444ToArgb_C EmptyYuv444Func
#define WebPYuv444ToRgba4444_C EmptyYuv444Func
#define WebPYuv444ToRgb565_C EmptyYuv444Func
#endif   // WEBP_REDUCE_CSP

#undef YUV444_FUNC

WebPYUV444Converter WebPYUV444Converters[MODE_LAST];

extern void WebPInitYUV444ConvertersMIPSdspR2(void);
extern void WebPInitYUV444ConvertersSSE2(void);
extern void WebPInitYUV444ConvertersSSE41(void);

WEBP_DSP_INIT_FUNC(WebPInitYUV444Converters) {
  WebPYUV444Converters[MODE_RGBA]      = WebPYuv444ToRgba_C;
  WebPYUV444Converters[MODE_BGRA]      = WebPYuv444ToBgra_C;
  WebPYUV444Converters[MODE_RGB]       = WebPYuv444ToRgb_C;
  WebPYUV444Converters[MODE_BGR]       = WebPYuv444ToBgr_C;
  WebPYUV444Converters[MODE_ARGB]      = WebPYuv444ToArgb_C;
  WebPYUV444Converters[MODE_RGBA_4444] = WebPYuv444ToRgba4444_C;
  WebPYUV444Converters[MODE_RGB_565]   = WebPYuv444ToRgb565_C;
  WebPYUV444Converters[MODE_rgbA]      = WebPYuv444ToRgba_C;
  WebPYUV444Converters[MODE_bgrA]      = WebPYuv444ToBgra_C;
  WebPYUV444Converters[MODE_Argb]      = WebPYuv444ToArgb_C;
  WebPYUV444Converters[MODE_rgbA_4444] = WebPYuv444ToRgba4444_C;

  if (VP8GetCPUInfo != NULL) {
#if defined(WEBP_HAVE_SSE2)
    if (VP8GetCPUInfo(kSSE2)) {
      WebPInitYUV444ConvertersSSE2();
    }
#endif
#if defined(WEBP_HAVE_SSE41)
    if (VP8GetCPUInfo(kSSE4_1)) {
      WebPInitYUV444ConvertersSSE41();
    }
#endif
#if defined(WEBP_USE_MIPS_DSP_R2)
    if (VP8GetCPUInfo(kMIPSdspR2)) {
      WebPInitYUV444ConvertersMIPSdspR2();
    }
#endif
  }
}

//------------------------------------------------------------------------------
// Main calls

extern void WebPInitUpsamplersSSE2(void);
extern void WebPInitUpsamplersSSE41(void);
extern void WebPInitUpsamplersNEON(void);
extern void WebPInitUpsamplersMIPSdspR2(void);
extern void WebPInitUpsamplersMSA(void);

WEBP_DSP_INIT_FUNC(WebPInitUpsamplers) {
#ifdef FANCY_UPSAMPLING
#if !WEBP_NEON_OMIT_C_CODE
  WebPUpsamplers[MODE_RGBA]      = UpsampleRgbaLinePair_C;
  WebPUpsamplers[MODE_BGRA]      = UpsampleBgraLinePair_C;
  WebPUpsamplers[MODE_rgbA]      = UpsampleRgbaLinePair_C;
  WebPUpsamplers[MODE_bgrA]      = UpsampleBgraLinePair_C;
  WebPUpsamplers[MODE_RGB]       = UpsampleRgbLinePair_C;
  WebPUpsamplers[MODE_BGR]       = UpsampleBgrLinePair_C;
  WebPUpsamplers[MODE_ARGB]      = UpsampleArgbLinePair_C;
  WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair_C;
  WebPUpsamplers[MODE_RGB_565]   = UpsampleRgb565LinePair_C;
  WebPUpsamplers[MODE_Argb]      = UpsampleArgbLinePair_C;
  WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair_C;
#endif

  // If defined, use CPUInfo() to overwrite some pointers with faster versions.
  if (VP8GetCPUInfo != NULL) {
#if defined(WEBP_HAVE_SSE2)
    if (VP8GetCPUInfo(kSSE2)) {
      WebPInitUpsamplersSSE2();
    }
#endif
#if defined(WEBP_HAVE_SSE41)
    if (VP8GetCPUInfo(kSSE4_1)) {
      WebPInitUpsamplersSSE41();
    }
#endif
#if defined(WEBP_USE_MIPS_DSP_R2)
    if (VP8GetCPUInfo(kMIPSdspR2)) {
      WebPInitUpsamplersMIPSdspR2();
    }
#endif
#if defined(WEBP_USE_MSA)
    if (VP8GetCPUInfo(kMSA)) {
      WebPInitUpsamplersMSA();
    }
#endif
  }

#if defined(WEBP_HAVE_NEON)
  if (WEBP_NEON_OMIT_C_CODE ||
      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
    WebPInitUpsamplersNEON();
  }
#endif

  assert(WebPUpsamplers[MODE_RGBA] != NULL);
  assert(WebPUpsamplers[MODE_BGRA] != NULL);
  assert(WebPUpsamplers[MODE_rgbA] != NULL);
  assert(WebPUpsamplers[MODE_bgrA] != NULL);
#if !defined(WEBP_REDUCE_CSP) || !WEBP_NEON_OMIT_C_CODE
  assert(WebPUpsamplers[MODE_RGB] != NULL);
  assert(WebPUpsamplers[MODE_BGR] != NULL);
  assert(WebPUpsamplers[MODE_ARGB] != NULL);
  assert(WebPUpsamplers[MODE_RGBA_4444] != NULL);
  assert(WebPUpsamplers[MODE_RGB_565] != NULL);
  assert(WebPUpsamplers[MODE_Argb] != NULL);
  assert(WebPUpsamplers[MODE_rgbA_4444] != NULL);
#endif

#endif  // FANCY_UPSAMPLING
}

//------------------------------------------------------------------------------