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 // YUV to RGB upsampling functions.
11 //
12 // Author: somnath@google.com (Somnath Banerjee)
13
14 #include "./dsp.h"
15 #include "./yuv.h"
16
17 #include <assert.h>
18
19 //------------------------------------------------------------------------------
20 // Fancy upsampler
21
22 #ifdef FANCY_UPSAMPLING
23
24 // Fancy upsampling functions to convert YUV to RGB
25 WebPUpsampleLinePairFunc WebPUpsamplers[MODE_LAST];
26
27 // Given samples laid out in a square as:
28 // [a b]
29 // [c d]
30 // we interpolate u/v as:
31 // ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16
32 // ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16
33
34 // We process u and v together stashed into 32bit (16bit each).
35 #define LOAD_UV(u, v) ((u) | ((v) << 16))
36
37 #define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \
38 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \
39 const uint8_t* top_u, const uint8_t* top_v, \
40 const uint8_t* cur_u, const uint8_t* cur_v, \
41 uint8_t* top_dst, uint8_t* bottom_dst, int len) { \
42 int x; \
43 const int last_pixel_pair = (len - 1) >> 1; \
44 uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \
45 uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \
46 assert(top_y != NULL); \
47 { \
48 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \
49 FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \
50 } \
51 if (bottom_y != NULL) { \
52 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \
53 FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \
54 } \
55 for (x = 1; x <= last_pixel_pair; ++x) { \
56 const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \
57 const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \
58 /* precompute invariant values associated with first and second diagonals*/\
59 const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \
60 const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \
61 const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \
62 { \
63 const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \
64 const uint32_t uv1 = (diag_03 + t_uv) >> 1; \
65 FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \
66 top_dst + (2 * x - 1) * XSTEP); \
67 FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \
68 top_dst + (2 * x - 0) * XSTEP); \
69 } \
70 if (bottom_y != NULL) { \
71 const uint32_t uv0 = (diag_03 + l_uv) >> 1; \
72 const uint32_t uv1 = (diag_12 + uv) >> 1; \
73 FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \
74 bottom_dst + (2 * x - 1) * XSTEP); \
75 FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \
76 bottom_dst + (2 * x + 0) * XSTEP); \
77 } \
78 tl_uv = t_uv; \
79 l_uv = uv; \
80 } \
81 if (!(len & 1)) { \
82 { \
83 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \
84 FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \
85 top_dst + (len - 1) * XSTEP); \
86 } \
87 if (bottom_y != NULL) { \
88 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \
89 FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \
90 bottom_dst + (len - 1) * XSTEP); \
91 } \
92 } \
93 }
94
95 // All variants implemented.
96 UPSAMPLE_FUNC(UpsampleRgbLinePair, VP8YuvToRgb, 3)
97 UPSAMPLE_FUNC(UpsampleBgrLinePair, VP8YuvToBgr, 3)
98 UPSAMPLE_FUNC(UpsampleRgbaLinePair, VP8YuvToRgba, 4)
99 UPSAMPLE_FUNC(UpsampleBgraLinePair, VP8YuvToBgra, 4)
100 UPSAMPLE_FUNC(UpsampleArgbLinePair, VP8YuvToArgb, 4)
101 UPSAMPLE_FUNC(UpsampleRgba4444LinePair, VP8YuvToRgba4444, 2)
102 UPSAMPLE_FUNC(UpsampleRgb565LinePair, VP8YuvToRgb565, 2)
103
104 #undef LOAD_UV
105 #undef UPSAMPLE_FUNC
106
107 #endif // FANCY_UPSAMPLING
108
109 //------------------------------------------------------------------------------
110
111 #if !defined(FANCY_UPSAMPLING)
112 #define DUAL_SAMPLE_FUNC(FUNC_NAME, FUNC) \
113 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bot_y, \
114 const uint8_t* top_u, const uint8_t* top_v, \
115 const uint8_t* bot_u, const uint8_t* bot_v, \
116 uint8_t* top_dst, uint8_t* bot_dst, int len) { \
117 const int half_len = len >> 1; \
118 int x; \
119 assert(top_dst != NULL); \
120 { \
121 for (x = 0; x < half_len; ++x) { \
122 FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x + 0); \
123 FUNC(top_y[2 * x + 1], top_u[x], top_v[x], top_dst + 8 * x + 4); \
124 } \
125 if (len & 1) FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x); \
126 } \
127 if (bot_dst != NULL) { \
128 for (x = 0; x < half_len; ++x) { \
129 FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x + 0); \
130 FUNC(bot_y[2 * x + 1], bot_u[x], bot_v[x], bot_dst + 8 * x + 4); \
131 } \
132 if (len & 1) FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x); \
133 } \
134 }
135
DUAL_SAMPLE_FUNC(DualLineSamplerBGRA,VP8YuvToBgra)136 DUAL_SAMPLE_FUNC(DualLineSamplerBGRA, VP8YuvToBgra)
137 DUAL_SAMPLE_FUNC(DualLineSamplerARGB, VP8YuvToArgb)
138 #undef DUAL_SAMPLE_FUNC
139
140 #endif // !FANCY_UPSAMPLING
141
142 WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last) {
143 WebPInitUpsamplers();
144 VP8YUVInit();
145 #ifdef FANCY_UPSAMPLING
146 return WebPUpsamplers[alpha_is_last ? MODE_BGRA : MODE_ARGB];
147 #else
148 return (alpha_is_last ? DualLineSamplerBGRA : DualLineSamplerARGB);
149 #endif
150 }
151
152 //------------------------------------------------------------------------------
153 // YUV444 converter
154
155 #define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \
156 static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \
157 uint8_t* dst, int len) { \
158 int i; \
159 for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \
160 }
161
162 YUV444_FUNC(Yuv444ToRgb, VP8YuvToRgb, 3)
163 YUV444_FUNC(Yuv444ToBgr, VP8YuvToBgr, 3)
164 YUV444_FUNC(Yuv444ToRgba, VP8YuvToRgba, 4)
165 YUV444_FUNC(Yuv444ToBgra, VP8YuvToBgra, 4)
166 YUV444_FUNC(Yuv444ToArgb, VP8YuvToArgb, 4)
167 YUV444_FUNC(Yuv444ToRgba4444, VP8YuvToRgba4444, 2)
168 YUV444_FUNC(Yuv444ToRgb565, VP8YuvToRgb565, 2)
169
170 #undef YUV444_FUNC
171
172 const WebPYUV444Converter WebPYUV444Converters[MODE_LAST] = {
173 Yuv444ToRgb, // MODE_RGB
174 Yuv444ToRgba, // MODE_RGBA
175 Yuv444ToBgr, // MODE_BGR
176 Yuv444ToBgra, // MODE_BGRA
177 Yuv444ToArgb, // MODE_ARGB
178 Yuv444ToRgba4444, // MODE_RGBA_4444
179 Yuv444ToRgb565, // MODE_RGB_565
180 Yuv444ToRgba, // MODE_rgbA
181 Yuv444ToBgra, // MODE_bgrA
182 Yuv444ToArgb, // MODE_Argb
183 Yuv444ToRgba4444 // MODE_rgbA_4444
184 };
185
186 //------------------------------------------------------------------------------
187 // Main calls
188
189 extern void WebPInitUpsamplersSSE2(void);
190 extern void WebPInitUpsamplersNEON(void);
191
192 static volatile VP8CPUInfo upsampling_last_cpuinfo_used2 =
193 (VP8CPUInfo)&upsampling_last_cpuinfo_used2;
194
WebPInitUpsamplers(void)195 void WebPInitUpsamplers(void) {
196 if (upsampling_last_cpuinfo_used2 == VP8GetCPUInfo) return;
197
198 #ifdef FANCY_UPSAMPLING
199 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair;
200 WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
201 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair;
202 WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
203 WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
204 WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
205 WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
206 WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
207 WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
208 WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
209 WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
210
211 // If defined, use CPUInfo() to overwrite some pointers with faster versions.
212 if (VP8GetCPUInfo != NULL) {
213 #if defined(WEBP_USE_SSE2)
214 if (VP8GetCPUInfo(kSSE2)) {
215 WebPInitUpsamplersSSE2();
216 }
217 #endif
218 #if defined(WEBP_USE_NEON)
219 if (VP8GetCPUInfo(kNEON)) {
220 WebPInitUpsamplersNEON();
221 }
222 #endif
223 }
224 #endif // FANCY_UPSAMPLING
225 upsampling_last_cpuinfo_used2 = VP8GetCPUInfo;
226 }
227
228 //------------------------------------------------------------------------------
229