gfx/ycbcr/yuv_convert_arm.cpp@97036ab72558
gfx/ycbcr/yuv_convert_arm.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // contributor Siarhei Siamashka <siarhei.siamashka@gmail.com>
7 #include "yuv_convert.h"
8 #include "ycbcr_to_rgb565.h"
12 #ifdef HAVE_YCBCR_TO_RGB565
14 namespace mozilla {
16 namespace gfx {
18 # if defined(MOZILLA_MAY_SUPPORT_NEON)
19 void __attribute((noinline,optimize("-fomit-frame-pointer")))
20 yuv42x_to_rgb565_row_neon(uint16 *dst,
21 const uint8 *y,
22 const uint8 *u,
23 const uint8 *v,
24 int n,
25 int oddflag)
26 {
27 static __attribute__((aligned(16))) uint16 acc_r[8] = {
28 22840, 22840, 22840, 22840, 22840, 22840, 22840, 22840,
29 };
30 static __attribute__((aligned(16))) uint16 acc_g[8] = {
31 17312, 17312, 17312, 17312, 17312, 17312, 17312, 17312,
32 };
33 static __attribute__((aligned(16))) uint16 acc_b[8] = {
34 28832, 28832, 28832, 28832, 28832, 28832, 28832, 28832,
35 };
36 /*
37 * Registers:
38 * q0, q1 : d0, d1, d2, d3 - are used for initial loading of YUV data
39 * q2 : d4, d5 - are used for storing converted RGB data
40 * q3 : d6, d7 - are used for temporary storage
41 *
42 * q4-q7 - reserved
43 *
44 * q8, q9 : d16, d17, d18, d19 - are used for expanded Y data
45 * q10 : d20, d21
46 * q11 : d22, d23
47 * q12 : d24, d25
48 * q13 : d26, d27
49 * q13, q14, q15 - various constants (#16, #149, #204, #50, #104, #154)
50 */
51 asm volatile (
52 ".fpu neon\n"
53 /* Allow to build on targets not supporting neon, and force the object file
54 * target to avoid bumping the final binary target */
55 ".arch armv7-a\n"
56 ".object_arch armv4t\n"
57 ".macro convert_macroblock size\n"
58 /* load up to 16 source pixels */
59 ".if \\size == 16\n"
60 "pld [%[y], #64]\n"
61 "pld [%[u], #64]\n"
62 "pld [%[v], #64]\n"
63 "vld1.8 {d1}, [%[y]]!\n"
64 "vld1.8 {d3}, [%[y]]!\n"
65 "vld1.8 {d0}, [%[u]]!\n"
66 "vld1.8 {d2}, [%[v]]!\n"
67 ".elseif \\size == 8\n"
68 "vld1.8 {d1}, [%[y]]!\n"
69 "vld1.8 {d0[0]}, [%[u]]!\n"
70 "vld1.8 {d0[1]}, [%[u]]!\n"
71 "vld1.8 {d0[2]}, [%[u]]!\n"
72 "vld1.8 {d0[3]}, [%[u]]!\n"
73 "vld1.8 {d2[0]}, [%[v]]!\n"
74 "vld1.8 {d2[1]}, [%[v]]!\n"
75 "vld1.8 {d2[2]}, [%[v]]!\n"
76 "vld1.8 {d2[3]}, [%[v]]!\n"
77 ".elseif \\size == 4\n"
78 "vld1.8 {d1[0]}, [%[y]]!\n"
79 "vld1.8 {d1[1]}, [%[y]]!\n"
80 "vld1.8 {d1[2]}, [%[y]]!\n"
81 "vld1.8 {d1[3]}, [%[y]]!\n"
82 "vld1.8 {d0[0]}, [%[u]]!\n"
83 "vld1.8 {d0[1]}, [%[u]]!\n"
84 "vld1.8 {d2[0]}, [%[v]]!\n"
85 "vld1.8 {d2[1]}, [%[v]]!\n"
86 ".elseif \\size == 2\n"
87 "vld1.8 {d1[0]}, [%[y]]!\n"
88 "vld1.8 {d1[1]}, [%[y]]!\n"
89 "vld1.8 {d0[0]}, [%[u]]!\n"
90 "vld1.8 {d2[0]}, [%[v]]!\n"
91 ".elseif \\size == 1\n"
92 "vld1.8 {d1[0]}, [%[y]]!\n"
93 "vld1.8 {d0[0]}, [%[u]]!\n"
94 "vld1.8 {d2[0]}, [%[v]]!\n"
95 ".else\n"
96 ".error \"unsupported macroblock size\"\n"
97 ".endif\n"
99 /* d1 - Y data (first 8 bytes) */
100 /* d3 - Y data (next 8 bytes) */
101 /* d0 - U data, d2 - V data */
103 /* split even and odd Y color components */
104 "vuzp.8 d1, d3\n" /* d1 - evenY, d3 - oddY */
105 /* clip upper and lower boundaries */
106 "vqadd.u8 q0, q0, q4\n"
107 "vqadd.u8 q1, q1, q4\n"
108 "vqsub.u8 q0, q0, q5\n"
109 "vqsub.u8 q1, q1, q5\n"
111 "vshr.u8 d4, d2, #1\n" /* d4 = V >> 1 */
113 "vmull.u8 q8, d1, d27\n" /* q8 = evenY * 149 */
114 "vmull.u8 q9, d3, d27\n" /* q9 = oddY * 149 */
116 "vld1.16 {d20, d21}, [%[acc_r], :128]\n" /* q10 - initialize accumulator for red */
117 "vsubw.u8 q10, q10, d4\n" /* red acc -= (V >> 1) */
118 "vmlsl.u8 q10, d2, d28\n" /* red acc -= V * 204 */
119 "vld1.16 {d22, d23}, [%[acc_g], :128]\n" /* q11 - initialize accumulator for green */
120 "vmlsl.u8 q11, d2, d30\n" /* green acc -= V * 104 */
121 "vmlsl.u8 q11, d0, d29\n" /* green acc -= U * 50 */
122 "vld1.16 {d24, d25}, [%[acc_b], :128]\n" /* q12 - initialize accumulator for blue */
123 "vmlsl.u8 q12, d0, d30\n" /* blue acc -= U * 104 */
124 "vmlsl.u8 q12, d0, d31\n" /* blue acc -= U * 154 */
126 "vhsub.s16 q3, q8, q10\n" /* calculate even red components */
127 "vhsub.s16 q10, q9, q10\n" /* calculate odd red components */
128 "vqshrun.s16 d0, q3, #6\n" /* right shift, narrow and saturate even red components */
129 "vqshrun.s16 d3, q10, #6\n" /* right shift, narrow and saturate odd red components */
131 "vhadd.s16 q3, q8, q11\n" /* calculate even green components */
132 "vhadd.s16 q11, q9, q11\n" /* calculate odd green components */
133 "vqshrun.s16 d1, q3, #6\n" /* right shift, narrow and saturate even green components */
134 "vqshrun.s16 d4, q11, #6\n" /* right shift, narrow and saturate odd green components */
136 "vhsub.s16 q3, q8, q12\n" /* calculate even blue components */
137 "vhsub.s16 q12, q9, q12\n" /* calculate odd blue components */
138 "vqshrun.s16 d2, q3, #6\n" /* right shift, narrow and saturate even blue components */
139 "vqshrun.s16 d5, q12, #6\n" /* right shift, narrow and saturate odd blue components */
141 "vzip.8 d0, d3\n" /* join even and odd red components */
142 "vzip.8 d1, d4\n" /* join even and odd green components */
143 "vzip.8 d2, d5\n" /* join even and odd blue components */
145 "vshll.u8 q3, d0, #8\n\t"
146 "vshll.u8 q8, d1, #8\n\t"
147 "vshll.u8 q9, d2, #8\n\t"
148 "vsri.u16 q3, q8, #5\t\n"
149 "vsri.u16 q3, q9, #11\t\n"
150 /* store pixel data to memory */
151 ".if \\size == 16\n"
152 " vst1.16 {d6, d7}, [%[dst]]!\n"
153 " vshll.u8 q3, d3, #8\n\t"
154 " vshll.u8 q8, d4, #8\n\t"
155 " vshll.u8 q9, d5, #8\n\t"
156 " vsri.u16 q3, q8, #5\t\n"
157 " vsri.u16 q3, q9, #11\t\n"
158 " vst1.16 {d6, d7}, [%[dst]]!\n"
159 ".elseif \\size == 8\n"
160 " vst1.16 {d6, d7}, [%[dst]]!\n"
161 ".elseif \\size == 4\n"
162 " vst1.16 {d6}, [%[dst]]!\n"
163 ".elseif \\size == 2\n"
164 " vst1.16 {d6[0]}, [%[dst]]!\n"
165 " vst1.16 {d6[1]}, [%[dst]]!\n"
166 ".elseif \\size == 1\n"
167 " vst1.16 {d6[0]}, [%[dst]]!\n"
168 ".endif\n"
169 ".endm\n"
171 "vmov.u8 d8, #15\n" /* add this to U/V to saturate upper boundary */
172 "vmov.u8 d9, #20\n" /* add this to Y to saturate upper boundary */
173 "vmov.u8 d10, #31\n" /* sub this from U/V to saturate lower boundary */
174 "vmov.u8 d11, #36\n" /* sub this from Y to saturate lower boundary */
176 "vmov.u8 d26, #16\n"
177 "vmov.u8 d27, #149\n"
178 "vmov.u8 d28, #204\n"
179 "vmov.u8 d29, #50\n"
180 "vmov.u8 d30, #104\n"
181 "vmov.u8 d31, #154\n"
183 "cmp %[oddflag], #0\n"
184 "beq 1f\n"
185 "convert_macroblock 1\n"
186 "sub %[n], %[n], #1\n"
187 "1:\n"
188 "subs %[n], %[n], #16\n"
189 "blt 2f\n"
190 "1:\n"
191 "convert_macroblock 16\n"
192 "subs %[n], %[n], #16\n"
193 "bge 1b\n"
194 "2:\n"
195 "tst %[n], #8\n"
196 "beq 3f\n"
197 "convert_macroblock 8\n"
198 "3:\n"
199 "tst %[n], #4\n"
200 "beq 4f\n"
201 "convert_macroblock 4\n"
202 "4:\n"
203 "tst %[n], #2\n"
204 "beq 5f\n"
205 "convert_macroblock 2\n"
206 "5:\n"
207 "tst %[n], #1\n"
208 "beq 6f\n"
209 "convert_macroblock 1\n"
210 "6:\n"
211 ".purgem convert_macroblock\n"
212 : [y] "+&r" (y), [u] "+&r" (u), [v] "+&r" (v), [dst] "+&r" (dst), [n] "+&r" (n)
213 : [acc_r] "r" (&acc_r[0]), [acc_g] "r" (&acc_g[0]), [acc_b] "r" (&acc_b[0]),
214 [oddflag] "r" (oddflag)
215 : "cc", "memory",
216 "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
217 "d8", "d9", "d10", "d11", /* "d12", "d13", "d14", "d15", */
218 "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
219 "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"
220 );
221 }
222 # endif // MOZILLA_MAY_SUPPORT_NEON
224 } // namespace gfx
226 } // namespace mozilla
228 #endif // HAVE_YCBCR_TO_RGB565
