gfx/ycbcr/yuv_convert_arm.cpp

   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.
   4
   5 // contributor Siarhei Siamashka <siarhei.siamashka@gmail.com>
   6
   7 #include "yuv_convert.h"
   8 #include "ycbcr_to_rgb565.h"
   9
  10
  11
  12 #ifdef HAVE_YCBCR_TO_RGB565
  13
  14 namespace mozilla {
  15
  16 namespace gfx {
  17
  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"
  98
  99         /* d1 - Y data (first 8 bytes) */
 100         /* d3 - Y data (next 8 bytes) */
 101         /* d0 - U data, d2 - V data */
 102
 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"
 110
 111         "vshr.u8     d4, d2, #1\n"                   /* d4 = V >> 1 */
 112
 113         "vmull.u8    q8, d1, d27\n"                  /* q8 = evenY * 149 */
 114         "vmull.u8    q9, d3, d27\n"                  /* q9 = oddY * 149 */
 115
 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 */
 125
 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 */
 130
 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 */
 135
 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 */
 140
 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 */
 144
 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"
 170
 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 */
 175
 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"
 182
 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
 223
 224 } // namespace gfx
 225
 226 } // namespace mozilla
 227
 228 #endif // HAVE_YCBCR_TO_RGB565