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cc: Added inline to Tile::IsReadyToDraw
[chromium-blink-merge.git] / third_party / libwebp / dsp / upsampling_sse2.c
blobf31d04845e4a2b2902350fecfcaf556f6987b13f
1 // Copyright 2011 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 version of YUV to RGB upsampling functions.
11 //
12 // Author: somnath@google.com (Somnath Banerjee)
13
14 #include "./dsp.h"
15
16 #if defined(__cplusplus) || defined(c_plusplus)
17 extern "C" {
18 #endif
19
20 #if defined(WEBP_USE_SSE2)
21
22 #include <assert.h>
23 #include <emmintrin.h>
24 #include <string.h>
25 #include "./yuv.h"
26
27 #ifdef FANCY_UPSAMPLING
28
29 // We compute (9*a + 3*b + 3*c + d + 8) / 16 as follows
30 // u = (9*a + 3*b + 3*c + d + 8) / 16
31 // = (a + (a + 3*b + 3*c + d) / 8 + 1) / 2
32 // = (a + m + 1) / 2
33 // where m = (a + 3*b + 3*c + d) / 8
34 // = ((a + b + c + d) / 2 + b + c) / 4
35 //
36 // Let's say k = (a + b + c + d) / 4.
37 // We can compute k as
38 // k = (s + t + 1) / 2 - ((a^d) | (b^c) | (s^t)) & 1
39 // where s = (a + d + 1) / 2 and t = (b + c + 1) / 2
40 //
41 // Then m can be written as
42 // m = (k + t + 1) / 2 - (((b^c) & (s^t)) | (k^t)) & 1
43
44 // Computes out = (k + in + 1) / 2 - ((ij & (s^t)) | (k^in)) & 1
45 #define GET_M(ij, in, out) do { \
46 const __m128i tmp0 = _mm_avg_epu8(k, (in)); /* (k + in + 1) / 2 */ \
47 const __m128i tmp1 = _mm_and_si128((ij), st); /* (ij) & (s^t) */ \
48 const __m128i tmp2 = _mm_xor_si128(k, (in)); /* (k^in) */ \
49 const __m128i tmp3 = _mm_or_si128(tmp1, tmp2); /* ((ij) & (s^t)) | (k^in) */\
50 const __m128i tmp4 = _mm_and_si128(tmp3, one); /* & 1 -> lsb_correction */ \
51 (out) = _mm_sub_epi8(tmp0, tmp4); /* (k + in + 1) / 2 - lsb_correction */ \
52 } while (0)
53
54 // pack and store two alterning pixel rows
55 #define PACK_AND_STORE(a, b, da, db, out) do { \
56 const __m128i t_a = _mm_avg_epu8(a, da); /* (9a + 3b + 3c + d + 8) / 16 */ \
57 const __m128i t_b = _mm_avg_epu8(b, db); /* (3a + 9b + c + 3d + 8) / 16 */ \
58 const __m128i t_1 = _mm_unpacklo_epi8(t_a, t_b); \
59 const __m128i t_2 = _mm_unpackhi_epi8(t_a, t_b); \
60 _mm_store_si128(((__m128i*)(out)) + 0, t_1); \
61 _mm_store_si128(((__m128i*)(out)) + 1, t_2); \
62 } while (0)
63
64 // Loads 17 pixels each from rows r1 and r2 and generates 32 pixels.
65 #define UPSAMPLE_32PIXELS(r1, r2, out) { \
66 const __m128i one = _mm_set1_epi8(1); \
67 const __m128i a = _mm_loadu_si128((__m128i*)&(r1)[0]); \
68 const __m128i b = _mm_loadu_si128((__m128i*)&(r1)[1]); \
69 const __m128i c = _mm_loadu_si128((__m128i*)&(r2)[0]); \
70 const __m128i d = _mm_loadu_si128((__m128i*)&(r2)[1]); \
71 \
72 const __m128i s = _mm_avg_epu8(a, d); /* s = (a + d + 1) / 2 */ \
73 const __m128i t = _mm_avg_epu8(b, c); /* t = (b + c + 1) / 2 */ \
74 const __m128i st = _mm_xor_si128(s, t); /* st = s^t */ \
75 \
76 const __m128i ad = _mm_xor_si128(a, d); /* ad = a^d */ \
77 const __m128i bc = _mm_xor_si128(b, c); /* bc = b^c */ \
78 \
79 const __m128i t1 = _mm_or_si128(ad, bc); /* (a^d) | (b^c) */ \
80 const __m128i t2 = _mm_or_si128(t1, st); /* (a^d) | (b^c) | (s^t) */ \
81 const __m128i t3 = _mm_and_si128(t2, one); /* (a^d) | (b^c) | (s^t) & 1 */ \
82 const __m128i t4 = _mm_avg_epu8(s, t); \
83 const __m128i k = _mm_sub_epi8(t4, t3); /* k = (a + b + c + d) / 4 */ \
84 __m128i diag1, diag2; \
85 \
86 GET_M(bc, t, diag1); /* diag1 = (a + 3b + 3c + d) / 8 */ \
87 GET_M(ad, s, diag2); /* diag2 = (3a + b + c + 3d) / 8 */ \
88 \
89 /* pack the alternate pixels */ \
90 PACK_AND_STORE(a, b, diag1, diag2, &(out)[0 * 32]); \
91 PACK_AND_STORE(c, d, diag2, diag1, &(out)[2 * 32]); \
92 }
93
94 // Turn the macro into a function for reducing code-size when non-critical
95 static void Upsample32Pixels(const uint8_t r1[], const uint8_t r2[],
96 uint8_t* const out) {
97 UPSAMPLE_32PIXELS(r1, r2, out);
98 }
99
100 #define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \
101 uint8_t r1[17], r2[17]; \
102 memcpy(r1, (tb), (num_pixels)); \
103 memcpy(r2, (bb), (num_pixels)); \
104 /* replicate last byte */ \
105 memset(r1 + (num_pixels), r1[(num_pixels) - 1], 17 - (num_pixels)); \
106 memset(r2 + (num_pixels), r2[(num_pixels) - 1], 17 - (num_pixels)); \
107 /* using the shared function instead of the macro saves ~3k code size */ \
108 Upsample32Pixels(r1, r2, out); \
109 }
110
111 #define CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y, uv, \
112 top_dst, bottom_dst, cur_x, num_pixels) { \
113 int n; \
114 if (top_y) { \
115 for (n = 0; n < (num_pixels); ++n) { \
116 FUNC(top_y[(cur_x) + n], (uv)[n], (uv)[32 + n], \
117 top_dst + ((cur_x) + n) * XSTEP); \
118 } \
119 } \
120 if (bottom_y) { \
121 for (n = 0; n < (num_pixels); ++n) { \
122 FUNC(bottom_y[(cur_x) + n], (uv)[64 + n], (uv)[64 + 32 + n], \
123 bottom_dst + ((cur_x) + n) * XSTEP); \
124 } \
125 } \
126 }
127
128 #define SSE2_UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \
129 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \
130 const uint8_t* top_u, const uint8_t* top_v, \
131 const uint8_t* cur_u, const uint8_t* cur_v, \
132 uint8_t* top_dst, uint8_t* bottom_dst, int len) { \
133 int block; \
134 /* 16 byte aligned array to cache reconstructed u and v */ \
135 uint8_t uv_buf[4 * 32 + 15]; \
136 uint8_t* const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \
137 const int uv_len = (len + 1) >> 1; \
138 /* 17 pixels must be read-able for each block */ \
139 const int num_blocks = (uv_len - 1) >> 4; \
140 const int leftover = uv_len - num_blocks * 16; \
141 const int last_pos = 1 + 32 * num_blocks; \
142 \
143 const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \
144 const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \
145 \
146 assert(len > 0); \
147 /* Treat the first pixel in regular way */ \
148 if (top_y) { \
149 const int u0 = (top_u[0] + u_diag) >> 1; \
150 const int v0 = (top_v[0] + v_diag) >> 1; \
151 FUNC(top_y[0], u0, v0, top_dst); \
152 } \
153 if (bottom_y) { \
154 const int u0 = (cur_u[0] + u_diag) >> 1; \
155 const int v0 = (cur_v[0] + v_diag) >> 1; \
156 FUNC(bottom_y[0], u0, v0, bottom_dst); \
157 } \
158 \
159 for (block = 0; block < num_blocks; ++block) { \
160 UPSAMPLE_32PIXELS(top_u, cur_u, r_uv + 0 * 32); \
161 UPSAMPLE_32PIXELS(top_v, cur_v, r_uv + 1 * 32); \
162 CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y, r_uv, top_dst, bottom_dst, \
163 32 * block + 1, 32) \
164 top_u += 16; \
165 cur_u += 16; \
166 top_v += 16; \
167 cur_v += 16; \
168 } \
169 \
170 UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv + 0 * 32); \
171 UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 1 * 32); \
172 CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y, r_uv, top_dst, bottom_dst, \
173 last_pos, len - last_pos); \
174 }
175
176 // SSE2 variants of the fancy upsampler.
177 SSE2_UPSAMPLE_FUNC(UpsampleRgbLinePairSSE2, VP8YuvToRgb, 3)
178 SSE2_UPSAMPLE_FUNC(UpsampleBgrLinePairSSE2, VP8YuvToBgr, 3)
179 SSE2_UPSAMPLE_FUNC(UpsampleRgbaLinePairSSE2, VP8YuvToRgba, 4)
180 SSE2_UPSAMPLE_FUNC(UpsampleBgraLinePairSSE2, VP8YuvToBgra, 4)
181
182 #undef GET_M
183 #undef PACK_AND_STORE
184 #undef UPSAMPLE_32PIXELS
185 #undef UPSAMPLE_LAST_BLOCK
186 #undef CONVERT2RGB
187 #undef SSE2_UPSAMPLE_FUNC
188
189 #endif // FANCY_UPSAMPLING
190
191 #endif // WEBP_USE_SSE2
192
193 //------------------------------------------------------------------------------
194
195 extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
196
197 void WebPInitUpsamplersSSE2(void) {
198 #if defined(WEBP_USE_SSE2)
199 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePairSSE2;
200 WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePairSSE2;
201 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePairSSE2;
202 WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePairSSE2;
203 #endif // WEBP_USE_SSE2
204 }
205
206 void WebPInitPremultiplySSE2(void) {
207 #if defined(WEBP_USE_SSE2)
208 WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePairSSE2;
209 WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePairSSE2;
210 #endif // WEBP_USE_SSE2
211 }
212
213 #if defined(__cplusplus) || defined(c_plusplus)
214 } // extern "C"
215 #endif
216
217