1 // Copyright 2014 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(s): Branimir Vasic (branimir.vasic@imgtec.com)
13 // Djordje Pesut (djordje.pesut@imgtec.com)
14
15 #include "src/dsp/dsp.h"
16
17 #if defined(WEBP_USE_MIPS_DSP_R2)
18
19 #include <assert.h>
20 #include "src/dsp/yuv.h"
21
22 #define YUV_TO_RGB(Y, U, V, R, G, B) do { \
23 const int t1 = MultHi(Y, 19077); \
24 const int t2 = MultHi(V, 13320); \
25 R = MultHi(V, 26149); \
26 G = MultHi(U, 6419); \
27 B = MultHi(U, 33050); \
28 R = t1 + R; \
29 G = t1 - G; \
30 B = t1 + B; \
31 R = R - 14234; \
32 G = G - t2 + 8708; \
33 B = B - 17685; \
34 __asm__ volatile ( \
35 "shll_s.w %[" #R "], %[" #R "], 17 \n\t" \
36 "shll_s.w %[" #G "], %[" #G "], 17 \n\t" \
37 "shll_s.w %[" #B "], %[" #B "], 17 \n\t" \
38 "precrqu_s.qb.ph %[" #R "], %[" #R "], $zero \n\t" \
39 "precrqu_s.qb.ph %[" #G "], %[" #G "], $zero \n\t" \
40 "precrqu_s.qb.ph %[" #B "], %[" #B "], $zero \n\t" \
41 "srl %[" #R "], %[" #R "], 24 \n\t" \
42 "srl %[" #G "], %[" #G "], 24 \n\t" \
43 "srl %[" #B "], %[" #B "], 24 \n\t" \
44 : [R]"+r"(R), [G]"+r"(G), [B]"+r"(B) \
45 : \
46 ); \
47 } while (0)
48
49 #if !defined(WEBP_REDUCE_CSP)
YuvToRgb(int y,int u,int v,uint8_t * const rgb)50 static WEBP_INLINE void YuvToRgb(int y, int u, int v, uint8_t* const rgb) {
51 int r, g, b;
52 YUV_TO_RGB(y, u, v, r, g, b);
53 rgb[0] = r;
54 rgb[1] = g;
55 rgb[2] = b;
56 }
YuvToBgr(int y,int u,int v,uint8_t * const bgr)57 static WEBP_INLINE void YuvToBgr(int y, int u, int v, uint8_t* const bgr) {
58 int r, g, b;
59 YUV_TO_RGB(y, u, v, r, g, b);
60 bgr[0] = b;
61 bgr[1] = g;
62 bgr[2] = r;
63 }
YuvToRgb565(int y,int u,int v,uint8_t * const rgb)64 static WEBP_INLINE void YuvToRgb565(int y, int u, int v, uint8_t* const rgb) {
65 int r, g, b;
66 YUV_TO_RGB(y, u, v, r, g, b);
67 {
68 const int rg = (r & 0xf8) | (g >> 5);
69 const int gb = ((g << 3) & 0xe0) | (b >> 3);
70 #if (WEBP_SWAP_16BIT_CSP == 1)
71 rgb[0] = gb;
72 rgb[1] = rg;
73 #else
74 rgb[0] = rg;
75 rgb[1] = gb;
76 #endif
77 }
78 }
YuvToRgba4444(int y,int u,int v,uint8_t * const argb)79 static WEBP_INLINE void YuvToRgba4444(int y, int u, int v,
80 uint8_t* const argb) {
81 int r, g, b;
82 YUV_TO_RGB(y, u, v, r, g, b);
83 {
84 const int rg = (r & 0xf0) | (g >> 4);
85 const int ba = (b & 0xf0) | 0x0f; // overwrite the lower 4 bits
86 #if (WEBP_SWAP_16BIT_CSP == 1)
87 argb[0] = ba;
88 argb[1] = rg;
89 #else
90 argb[0] = rg;
91 argb[1] = ba;
92 #endif
93 }
94 }
95 #endif // WEBP_REDUCE_CSP
96
97 //-----------------------------------------------------------------------------
98 // Alpha handling variants
99
100 #if !defined(WEBP_REDUCE_CSP)
YuvToArgb(uint8_t y,uint8_t u,uint8_t v,uint8_t * const argb)101 static WEBP_INLINE void YuvToArgb(uint8_t y, uint8_t u, uint8_t v,
102 uint8_t* const argb) {
103 int r, g, b;
104 YUV_TO_RGB(y, u, v, r, g, b);
105 argb[0] = 0xff;
106 argb[1] = r;
107 argb[2] = g;
108 argb[3] = b;
109 }
110 #endif // WEBP_REDUCE_CSP
YuvToBgra(uint8_t y,uint8_t u,uint8_t v,uint8_t * const bgra)111 static WEBP_INLINE void YuvToBgra(uint8_t y, uint8_t u, uint8_t v,
112 uint8_t* const bgra) {
113 int r, g, b;
114 YUV_TO_RGB(y, u, v, r, g, b);
115 bgra[0] = b;
116 bgra[1] = g;
117 bgra[2] = r;
118 bgra[3] = 0xff;
119 }
YuvToRgba(uint8_t y,uint8_t u,uint8_t v,uint8_t * const rgba)120 static WEBP_INLINE void YuvToRgba(uint8_t y, uint8_t u, uint8_t v,
121 uint8_t* const rgba) {
122 int r, g, b;
123 YUV_TO_RGB(y, u, v, r, g, b);
124 rgba[0] = r;
125 rgba[1] = g;
126 rgba[2] = b;
127 rgba[3] = 0xff;
128 }
129
130 //------------------------------------------------------------------------------
131 // Fancy upsampler
132
133 #ifdef FANCY_UPSAMPLING
134
135 // Given samples laid out in a square as:
136 // [a b]
137 // [c d]
138 // we interpolate u/v as:
139 // ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16
140 // ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16
141
142 // We process u and v together stashed into 32bit (16bit each).
143 #define LOAD_UV(u, v) ((u) | ((v) << 16))
144
145 #define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \
146 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \
147 const uint8_t* top_u, const uint8_t* top_v, \
148 const uint8_t* cur_u, const uint8_t* cur_v, \
149 uint8_t* top_dst, uint8_t* bottom_dst, int len) { \
150 int x; \
151 const int last_pixel_pair = (len - 1) >> 1; \
152 uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \
153 uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \
154 assert(top_y != NULL); \
155 { \
156 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \
157 FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \
158 } \
159 if (bottom_y != NULL) { \
160 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \
161 FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \
162 } \
163 for (x = 1; x <= last_pixel_pair; ++x) { \
164 const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \
165 const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \
166 /* precompute invariant values associated with first and second diagonals*/\
167 const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \
168 const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \
169 const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \
170 { \
171 const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \
172 const uint32_t uv1 = (diag_03 + t_uv) >> 1; \
173 FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \
174 top_dst + (2 * x - 1) * XSTEP); \
175 FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \
176 top_dst + (2 * x - 0) * XSTEP); \
177 } \
178 if (bottom_y != NULL) { \
179 const uint32_t uv0 = (diag_03 + l_uv) >> 1; \
180 const uint32_t uv1 = (diag_12 + uv) >> 1; \
181 FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \
182 bottom_dst + (2 * x - 1) * XSTEP); \
183 FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \
184 bottom_dst + (2 * x + 0) * XSTEP); \
185 } \
186 tl_uv = t_uv; \
187 l_uv = uv; \
188 } \
189 if (!(len & 1)) { \
190 { \
191 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \
192 FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \
193 top_dst + (len - 1) * XSTEP); \
194 } \
195 if (bottom_y != NULL) { \
196 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \
197 FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \
198 bottom_dst + (len - 1) * XSTEP); \
199 } \
200 } \
201 }
202
203 // All variants implemented.
204 UPSAMPLE_FUNC(UpsampleRgbaLinePair, YuvToRgba, 4)
205 UPSAMPLE_FUNC(UpsampleBgraLinePair, YuvToBgra, 4)
206 #if !defined(WEBP_REDUCE_CSP)
207 UPSAMPLE_FUNC(UpsampleRgbLinePair, YuvToRgb, 3)
208 UPSAMPLE_FUNC(UpsampleBgrLinePair, YuvToBgr, 3)
209 UPSAMPLE_FUNC(UpsampleArgbLinePair, YuvToArgb, 4)
210 UPSAMPLE_FUNC(UpsampleRgba4444LinePair, YuvToRgba4444, 2)
211 UPSAMPLE_FUNC(UpsampleRgb565LinePair, YuvToRgb565, 2)
212 #endif // WEBP_REDUCE_CSP
213
214 #undef LOAD_UV
215 #undef UPSAMPLE_FUNC
216
217 //------------------------------------------------------------------------------
218 // Entry point
219
220 extern void WebPInitUpsamplersMIPSdspR2(void);
221
WebPInitUpsamplersMIPSdspR2(void)222 WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersMIPSdspR2(void) {
223 WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
224 WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
225 WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
226 WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
227 #if !defined(WEBP_REDUCE_CSP)
228 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair;
229 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair;
230 WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
231 WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
232 WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
233 WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
234 WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
235 #endif // WEBP_REDUCE_CSP
236 }
237
238 #endif // FANCY_UPSAMPLING
239
240 //------------------------------------------------------------------------------
241 // YUV444 converter
242
243 #define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \
244 static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \
245 uint8_t* dst, int len) { \
246 int i; \
247 for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \
248 }
249
250 YUV444_FUNC(Yuv444ToRgba, YuvToRgba, 4)
251 YUV444_FUNC(Yuv444ToBgra, YuvToBgra, 4)
252 #if !defined(WEBP_REDUCE_CSP)
253 YUV444_FUNC(Yuv444ToRgb, YuvToRgb, 3)
254 YUV444_FUNC(Yuv444ToBgr, YuvToBgr, 3)
255 YUV444_FUNC(Yuv444ToArgb, YuvToArgb, 4)
256 YUV444_FUNC(Yuv444ToRgba4444, YuvToRgba4444, 2)
257 YUV444_FUNC(Yuv444ToRgb565, YuvToRgb565, 2)
258 #endif // WEBP_REDUCE_CSP
259
260 #undef YUV444_FUNC
261
262 //------------------------------------------------------------------------------
263 // Entry point
264
265 extern void WebPInitYUV444ConvertersMIPSdspR2(void);
266
WebPInitYUV444ConvertersMIPSdspR2(void)267 WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersMIPSdspR2(void) {
268 WebPYUV444Converters[MODE_RGBA] = Yuv444ToRgba;
269 WebPYUV444Converters[MODE_BGRA] = Yuv444ToBgra;
270 WebPYUV444Converters[MODE_rgbA] = Yuv444ToRgba;
271 WebPYUV444Converters[MODE_bgrA] = Yuv444ToBgra;
272 #if !defined(WEBP_REDUCE_CSP)
273 WebPYUV444Converters[MODE_RGB] = Yuv444ToRgb;
274 WebPYUV444Converters[MODE_BGR] = Yuv444ToBgr;
275 WebPYUV444Converters[MODE_ARGB] = Yuv444ToArgb;
276 WebPYUV444Converters[MODE_RGBA_4444] = Yuv444ToRgba4444;
277 WebPYUV444Converters[MODE_RGB_565] = Yuv444ToRgb565;
278 WebPYUV444Converters[MODE_Argb] = Yuv444ToArgb;
279 WebPYUV444Converters[MODE_rgbA_4444] = Yuv444ToRgba4444;
280 #endif // WEBP_REDUCE_CSP
281 }
282
283 #else // !WEBP_USE_MIPS_DSP_R2
284
285 WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersMIPSdspR2)
286
287 #endif // WEBP_USE_MIPS_DSP_R2
288
289 #if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_MIPS_DSP_R2))
290 WEBP_DSP_INIT_STUB(WebPInitUpsamplersMIPSdspR2)
291 #endif
292