1 // Copyright 2011 Google Inc. All Rights Reserved.
3 // This code is licensed under the same terms as WebM:
4 // Software License Agreement: http://www.webmproject.org/license/software/
5 // Additional IP Rights Grant: http://www.webmproject.org/license/additional/
6 // -----------------------------------------------------------------------------
8 // NEON version of YUV to RGB upsampling functions.
10 // Author: mans@mansr.com (Mans Rullgard)
11 // Based on SSE code by: somnath@google.com (Somnath Banerjee)
15 #if defined(__cplusplus) || defined(c_plusplus)
19 #if defined(WEBP_USE_NEON)
26 #ifdef FANCY_UPSAMPLING
28 // Loads 9 pixels each from rows r1 and r2 and generates 16 pixels.
29 #define UPSAMPLE_16PIXELS(r1, r2, out) { \
30 uint8x8_t a = vld1_u8(r1); \
31 uint8x8_t b = vld1_u8(r1 + 1); \
32 uint8x8_t c = vld1_u8(r2); \
33 uint8x8_t d = vld1_u8(r2 + 1); \
35 uint16x8_t al = vshll_n_u8(a, 1); \
36 uint16x8_t bl = vshll_n_u8(b, 1); \
37 uint16x8_t cl = vshll_n_u8(c, 1); \
38 uint16x8_t dl = vshll_n_u8(d, 1); \
40 uint8x8_t diag1, diag2; \
44 sl = vaddl_u8(a, b); \
45 sl = vaddw_u8(sl, c); \
46 sl = vaddw_u8(sl, d); \
48 al = vaddq_u16(sl, al); /* 3a + b + c + d */ \
49 bl = vaddq_u16(sl, bl); /* a + 3b + c + d */ \
51 al = vaddq_u16(al, dl); /* 3a + b + c + 3d */ \
52 bl = vaddq_u16(bl, cl); /* a + 3b + 3c + d */ \
54 diag2 = vshrn_n_u16(al, 3); \
55 diag1 = vshrn_n_u16(bl, 3); \
57 a = vrhadd_u8(a, diag1); \
58 b = vrhadd_u8(b, diag2); \
59 c = vrhadd_u8(c, diag2); \
60 d = vrhadd_u8(d, diag1); \
63 const uint8x8x2_t a_b = {{ a, b }}; \
64 const uint8x8x2_t c_d = {{ c, d }}; \
66 vst2_u8(out + 32, c_d); \
70 // Turn the macro into a function for reducing code-size when non-critical
71 static void Upsample16Pixels(const uint8_t *r1, const uint8_t *r2,
73 UPSAMPLE_16PIXELS(r1, r2, out);
76 #define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \
77 uint8_t r1[9], r2[9]; \
78 memcpy(r1, (tb), (num_pixels)); \
79 memcpy(r2, (bb), (num_pixels)); \
80 /* replicate last byte */ \
81 memset(r1 + (num_pixels), r1[(num_pixels) - 1], 9 - (num_pixels)); \
82 memset(r2 + (num_pixels), r2[(num_pixels) - 1], 9 - (num_pixels)); \
83 Upsample16Pixels(r1, r2, out); \
92 static const int16_t coef[4] = { CVR / 4, CUG, CVG / 2, CUB / 4 };
94 #define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) { \
96 for (i = 0; i < N; i += 8) { \
97 int off = ((cur_x) + i) * XSTEP; \
98 uint8x8_t y = vld1_u8(src_y + (cur_x) + i); \
99 uint8x8_t u = vld1_u8((src_uv) + i); \
100 uint8x8_t v = vld1_u8((src_uv) + i + 16); \
101 int16x8_t yy = vreinterpretq_s16_u16(vsubl_u8(y, u16)); \
102 int16x8_t uu = vreinterpretq_s16_u16(vsubl_u8(u, u128)); \
103 int16x8_t vv = vreinterpretq_s16_u16(vsubl_u8(v, u128)); \
105 int16x8_t ud = vshlq_n_s16(uu, 1); \
106 int16x8_t vd = vshlq_n_s16(vv, 1); \
108 int32x4_t vrl = vqdmlal_lane_s16(vshll_n_s16(vget_low_s16(vv), 1), \
109 vget_low_s16(vd), cf16, 0); \
110 int32x4_t vrh = vqdmlal_lane_s16(vshll_n_s16(vget_high_s16(vv), 1), \
111 vget_high_s16(vd), cf16, 0); \
112 int16x8_t vr = vcombine_s16(vrshrn_n_s32(vrl, 16), \
113 vrshrn_n_s32(vrh, 16)); \
115 int32x4_t vl = vmovl_s16(vget_low_s16(vv)); \
116 int32x4_t vh = vmovl_s16(vget_high_s16(vv)); \
117 int32x4_t ugl = vmlal_lane_s16(vl, vget_low_s16(uu), cf16, 1); \
118 int32x4_t ugh = vmlal_lane_s16(vh, vget_high_s16(uu), cf16, 1); \
119 int32x4_t gcl = vqdmlal_lane_s16(ugl, vget_low_s16(vv), cf16, 2); \
120 int32x4_t gch = vqdmlal_lane_s16(ugh, vget_high_s16(vv), cf16, 2); \
121 int16x8_t gc = vcombine_s16(vrshrn_n_s32(gcl, 16), \
122 vrshrn_n_s32(gch, 16)); \
124 int32x4_t ubl = vqdmlal_lane_s16(vshll_n_s16(vget_low_s16(uu), 1), \
125 vget_low_s16(ud), cf16, 3); \
126 int32x4_t ubh = vqdmlal_lane_s16(vshll_n_s16(vget_high_s16(uu), 1), \
127 vget_high_s16(ud), cf16, 3); \
128 int16x8_t ub = vcombine_s16(vrshrn_n_s32(ubl, 16), \
129 vrshrn_n_s32(ubh, 16)); \
131 int32x4_t rl = vaddl_s16(vget_low_s16(yy), vget_low_s16(vr)); \
132 int32x4_t rh = vaddl_s16(vget_high_s16(yy), vget_high_s16(vr)); \
133 int32x4_t gl = vsubl_s16(vget_low_s16(yy), vget_low_s16(gc)); \
134 int32x4_t gh = vsubl_s16(vget_high_s16(yy), vget_high_s16(gc)); \
135 int32x4_t bl = vaddl_s16(vget_low_s16(yy), vget_low_s16(ub)); \
136 int32x4_t bh = vaddl_s16(vget_high_s16(yy), vget_high_s16(ub)); \
138 rl = vmulq_lane_s32(rl, cf32, 0); \
139 rh = vmulq_lane_s32(rh, cf32, 0); \
140 gl = vmulq_lane_s32(gl, cf32, 0); \
141 gh = vmulq_lane_s32(gh, cf32, 0); \
142 bl = vmulq_lane_s32(bl, cf32, 0); \
143 bh = vmulq_lane_s32(bh, cf32, 0); \
145 y = vqmovun_s16(vcombine_s16(vrshrn_n_s32(rl, 16), \
146 vrshrn_n_s32(rh, 16))); \
147 u = vqmovun_s16(vcombine_s16(vrshrn_n_s32(gl, 16), \
148 vrshrn_n_s32(gh, 16))); \
149 v = vqmovun_s16(vcombine_s16(vrshrn_n_s32(bl, 16), \
150 vrshrn_n_s32(bh, 16))); \
151 STR_ ## FMT(out + off, y, u, v); \
155 #define v255 vmov_n_u8(255)
157 #define STR_Rgb(out, r, g, b) do { \
158 const uint8x8x3_t r_g_b = {{ r, g, b }}; \
159 vst3_u8(out, r_g_b); \
162 #define STR_Bgr(out, r, g, b) do { \
163 const uint8x8x3_t b_g_r = {{ b, g, r }}; \
164 vst3_u8(out, b_g_r); \
167 #define STR_Rgba(out, r, g, b) do { \
168 const uint8x8x4_t r_g_b_v255 = {{ r, g, b, v255 }}; \
169 vst4_u8(out, r_g_b_v255); \
172 #define STR_Bgra(out, r, g, b) do { \
173 const uint8x8x4_t b_g_r_v255 = {{ b, g, r, v255 }}; \
174 vst4_u8(out, b_g_r_v255); \
177 #define CONVERT1(FMT, XSTEP, N, src_y, src_uv, rgb, cur_x) { \
179 for (i = 0; i < N; i++) { \
180 int off = ((cur_x) + i) * XSTEP; \
181 int y = src_y[(cur_x) + i]; \
182 int u = (src_uv)[i]; \
183 int v = (src_uv)[i + 16]; \
184 VP8YuvTo ## FMT(y, u, v, rgb + off); \
188 #define CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, uv, \
189 top_dst, bottom_dst, cur_x, len) { \
191 CONVERT8(FMT, XSTEP, len, top_y, uv, top_dst, cur_x) \
194 CONVERT8(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x) \
198 #define CONVERT2RGB_1(FMT, XSTEP, top_y, bottom_y, uv, \
199 top_dst, bottom_dst, cur_x, len) { \
201 CONVERT1(FMT, XSTEP, len, top_y, uv, top_dst, cur_x); \
204 CONVERT1(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \
208 #define NEON_UPSAMPLE_FUNC(FUNC_NAME, FMT, XSTEP) \
209 static void FUNC_NAME(const uint8_t *top_y, const uint8_t *bottom_y, \
210 const uint8_t *top_u, const uint8_t *top_v, \
211 const uint8_t *cur_u, const uint8_t *cur_v, \
212 uint8_t *top_dst, uint8_t *bottom_dst, int len) { \
214 /* 16 byte aligned array to cache reconstructed u and v */ \
215 uint8_t uv_buf[2 * 32 + 15]; \
216 uint8_t *const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \
217 const int uv_len = (len + 1) >> 1; \
218 /* 9 pixels must be read-able for each block */ \
219 const int num_blocks = (uv_len - 1) >> 3; \
220 const int leftover = uv_len - num_blocks * 8; \
221 const int last_pos = 1 + 16 * num_blocks; \
223 const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \
224 const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \
226 const int16x4_t cf16 = vld1_s16(coef); \
227 const int32x2_t cf32 = vmov_n_s32(CY); \
228 const uint8x8_t u16 = vmov_n_u8(16); \
229 const uint8x8_t u128 = vmov_n_u8(128); \
231 /* Treat the first pixel in regular way */ \
233 const int u0 = (top_u[0] + u_diag) >> 1; \
234 const int v0 = (top_v[0] + v_diag) >> 1; \
235 VP8YuvTo ## FMT(top_y[0], u0, v0, top_dst); \
238 const int u0 = (cur_u[0] + u_diag) >> 1; \
239 const int v0 = (cur_v[0] + v_diag) >> 1; \
240 VP8YuvTo ## FMT(bottom_y[0], u0, v0, bottom_dst); \
243 for (block = 0; block < num_blocks; ++block) { \
244 UPSAMPLE_16PIXELS(top_u, cur_u, r_uv); \
245 UPSAMPLE_16PIXELS(top_v, cur_v, r_uv + 16); \
246 CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, r_uv, \
247 top_dst, bottom_dst, 16 * block + 1, 16); \
254 UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv); \
255 UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 16); \
256 CONVERT2RGB_1(FMT, XSTEP, top_y, bottom_y, r_uv, \
257 top_dst, bottom_dst, last_pos, len - last_pos); \
260 // NEON variants of the fancy upsampler.
261 NEON_UPSAMPLE_FUNC(UpsampleRgbLinePairNEON, Rgb, 3)
262 NEON_UPSAMPLE_FUNC(UpsampleBgrLinePairNEON, Bgr, 3)
263 NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePairNEON, Rgba, 4)
264 NEON_UPSAMPLE_FUNC(UpsampleBgraLinePairNEON, Bgra, 4)
266 #endif // FANCY_UPSAMPLING
268 #endif // WEBP_USE_NEON
270 //------------------------------------------------------------------------------
272 extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
274 void WebPInitUpsamplersNEON(void) {
275 #if defined(WEBP_USE_NEON)
276 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePairNEON;
277 WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePairNEON;
278 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePairNEON;
279 WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePairNEON;
280 #endif // WEBP_USE_NEON
283 void WebPInitPremultiplyNEON(void) {
284 #if defined(WEBP_USE_NEON)
285 WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePairNEON;
286 WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePairNEON;
287 #endif // WEBP_USE_NEON
290 #if defined(__cplusplus) || defined(c_plusplus)