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yuv_convert_arm.cpp
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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// contributor Siarhei Siamashka <siarhei.siamashka@gmail.com>
#include "yuv_convert.h"
#include "ycbcr_to_rgb565.h"
#ifdef HAVE_YCBCR_TO_RGB565
namespace mozilla {
namespace gfx {
# if defined(MOZILLA_MAY_SUPPORT_NEON)
void __attribute((noinline,optimize("-fomit-frame-pointer")))
yuv42x_to_rgb565_row_neon(uint16 *dst,
const uint8 *y,
const uint8 *u,
const uint8 *v,
int n,
int oddflag)
{
static __attribute__((aligned(16))) uint16 acc_r[8] = {
22840, 22840, 22840, 22840, 22840, 22840, 22840, 22840,
};
static __attribute__((aligned(16))) uint16 acc_g[8] = {
17312, 17312, 17312, 17312, 17312, 17312, 17312, 17312,
};
static __attribute__((aligned(16))) uint16 acc_b[8] = {
28832, 28832, 28832, 28832, 28832, 28832, 28832, 28832,
};
/*
* Registers:
* q0, q1 : d0, d1, d2, d3 - are used for initial loading of YUV data
* q2 : d4, d5 - are used for storing converted RGB data
* q3 : d6, d7 - are used for temporary storage
*
* q4-q7 - reserved
*
* q8, q9 : d16, d17, d18, d19 - are used for expanded Y data
* q10 : d20, d21
* q11 : d22, d23
* q12 : d24, d25
* q13 : d26, d27
* q13, q14, q15 - various constants (#16, #149, #204, #50, #104, #154)
*/
asm volatile (
".fpu neon\n"
/* Allow to build on targets not supporting neon, and force the object file
* target to avoid bumping the final binary target */
".arch armv7-a\n"
".object_arch armv4t\n"
".macro convert_macroblock size\n"
/* load up to 16 source pixels */
".if \\size == 16\n"
"pld [%[y], #64]\n"
"pld [%[u], #64]\n"
"pld [%[v], #64]\n"
"vld1.8 {d1}, [%[y]]!\n"
"vld1.8 {d3}, [%[y]]!\n"
"vld1.8 {d0}, [%[u]]!\n"
"vld1.8 {d2}, [%[v]]!\n"
".elseif \\size == 8\n"
"vld1.8 {d1}, [%[y]]!\n"
"vld1.8 {d0[0]}, [%[u]]!\n"
"vld1.8 {d0[1]}, [%[u]]!\n"
"vld1.8 {d0[2]}, [%[u]]!\n"
"vld1.8 {d0[3]}, [%[u]]!\n"
"vld1.8 {d2[0]}, [%[v]]!\n"
"vld1.8 {d2[1]}, [%[v]]!\n"
"vld1.8 {d2[2]}, [%[v]]!\n"
"vld1.8 {d2[3]}, [%[v]]!\n"
".elseif \\size == 4\n"
"vld1.8 {d1[0]}, [%[y]]!\n"
"vld1.8 {d1[1]}, [%[y]]!\n"
"vld1.8 {d1[2]}, [%[y]]!\n"
"vld1.8 {d1[3]}, [%[y]]!\n"
"vld1.8 {d0[0]}, [%[u]]!\n"
"vld1.8 {d0[1]}, [%[u]]!\n"
"vld1.8 {d2[0]}, [%[v]]!\n"
"vld1.8 {d2[1]}, [%[v]]!\n"
".elseif \\size == 2\n"
"vld1.8 {d1[0]}, [%[y]]!\n"
"vld1.8 {d1[1]}, [%[y]]!\n"
"vld1.8 {d0[0]}, [%[u]]!\n"
"vld1.8 {d2[0]}, [%[v]]!\n"
".elseif \\size == 1\n"
"vld1.8 {d1[0]}, [%[y]]!\n"
"vld1.8 {d0[0]}, [%[u]]!\n"
"vld1.8 {d2[0]}, [%[v]]!\n"
".else\n"
".error \"unsupported macroblock size\"\n"
".endif\n"
/* d1 - Y data (first 8 bytes) */
/* d3 - Y data (next 8 bytes) */
/* d0 - U data, d2 - V data */
/* split even and odd Y color components */
"vuzp.8 d1, d3\n" /* d1 - evenY, d3 - oddY */
/* clip upper and lower boundaries */
"vqadd.u8 q0, q0, q4\n"
"vqadd.u8 q1, q1, q4\n"
"vqsub.u8 q0, q0, q5\n"
"vqsub.u8 q1, q1, q5\n"
"vshr.u8 d4, d2, #1\n" /* d4 = V >> 1 */
"vmull.u8 q8, d1, d27\n" /* q8 = evenY * 149 */
"vmull.u8 q9, d3, d27\n" /* q9 = oddY * 149 */
"vld1.16 {d20, d21}, [%[acc_r], :128]\n" /* q10 - initialize accumulator for red */
"vsubw.u8 q10, q10, d4\n" /* red acc -= (V >> 1) */
"vmlsl.u8 q10, d2, d28\n" /* red acc -= V * 204 */
"vld1.16 {d22, d23}, [%[acc_g], :128]\n" /* q11 - initialize accumulator for green */
"vmlsl.u8 q11, d2, d30\n" /* green acc -= V * 104 */
"vmlsl.u8 q11, d0, d29\n" /* green acc -= U * 50 */
"vld1.16 {d24, d25}, [%[acc_b], :128]\n" /* q12 - initialize accumulator for blue */
"vmlsl.u8 q12, d0, d30\n" /* blue acc -= U * 104 */
"vmlsl.u8 q12, d0, d31\n" /* blue acc -= U * 154 */
"vhsub.s16 q3, q8, q10\n" /* calculate even red components */
"vhsub.s16 q10, q9, q10\n" /* calculate odd red components */
"vqshrun.s16 d0, q3, #6\n" /* right shift, narrow and saturate even red components */
"vqshrun.s16 d3, q10, #6\n" /* right shift, narrow and saturate odd red components */
"vhadd.s16 q3, q8, q11\n" /* calculate even green components */
"vhadd.s16 q11, q9, q11\n" /* calculate odd green components */
"vqshrun.s16 d1, q3, #6\n" /* right shift, narrow and saturate even green components */
"vqshrun.s16 d4, q11, #6\n" /* right shift, narrow and saturate odd green components */
"vhsub.s16 q3, q8, q12\n" /* calculate even blue components */
"vhsub.s16 q12, q9, q12\n" /* calculate odd blue components */
"vqshrun.s16 d2, q3, #6\n" /* right shift, narrow and saturate even blue components */
"vqshrun.s16 d5, q12, #6\n" /* right shift, narrow and saturate odd blue components */
"vzip.8 d0, d3\n" /* join even and odd red components */
"vzip.8 d1, d4\n" /* join even and odd green components */
"vzip.8 d2, d5\n" /* join even and odd blue components */
"vshll.u8 q3, d0, #8\n\t"
"vshll.u8 q8, d1, #8\n\t"
"vshll.u8 q9, d2, #8\n\t"
"vsri.u16 q3, q8, #5\t\n"
"vsri.u16 q3, q9, #11\t\n"
/* store pixel data to memory */
".if \\size == 16\n"
" vst1.16 {d6, d7}, [%[dst]]!\n"
" vshll.u8 q3, d3, #8\n\t"
" vshll.u8 q8, d4, #8\n\t"
" vshll.u8 q9, d5, #8\n\t"
" vsri.u16 q3, q8, #5\t\n"
" vsri.u16 q3, q9, #11\t\n"
" vst1.16 {d6, d7}, [%[dst]]!\n"
".elseif \\size == 8\n"
" vst1.16 {d6, d7}, [%[dst]]!\n"
".elseif \\size == 4\n"
" vst1.16 {d6}, [%[dst]]!\n"
".elseif \\size == 2\n"
" vst1.16 {d6[0]}, [%[dst]]!\n"
" vst1.16 {d6[1]}, [%[dst]]!\n"
".elseif \\size == 1\n"
" vst1.16 {d6[0]}, [%[dst]]!\n"
".endif\n"
".endm\n"
"vmov.u8 d8, #15\n" /* add this to U/V to saturate upper boundary */
"vmov.u8 d9, #20\n" /* add this to Y to saturate upper boundary */
"vmov.u8 d10, #31\n" /* sub this from U/V to saturate lower boundary */
"vmov.u8 d11, #36\n" /* sub this from Y to saturate lower boundary */
"vmov.u8 d26, #16\n"
"vmov.u8 d27, #149\n"
"vmov.u8 d28, #204\n"
"vmov.u8 d29, #50\n"
"vmov.u8 d30, #104\n"
"vmov.u8 d31, #154\n"
"cmp %[oddflag], #0\n"
"beq 1f\n"
"convert_macroblock 1\n"
"sub %[n], %[n], #1\n"
"1:\n"
"subs %[n], %[n], #16\n"
"blt 2f\n"
"1:\n"
"convert_macroblock 16\n"
"subs %[n], %[n], #16\n"
"bge 1b\n"
"2:\n"
"tst %[n], #8\n"
"beq 3f\n"
"convert_macroblock 8\n"
"3:\n"
"tst %[n], #4\n"
"beq 4f\n"
"convert_macroblock 4\n"
"4:\n"
"tst %[n], #2\n"
"beq 5f\n"
"convert_macroblock 2\n"
"5:\n"
"tst %[n], #1\n"
"beq 6f\n"
"convert_macroblock 1\n"
"6:\n"
".purgem convert_macroblock\n"
: [y] "+&r" (y), [u] "+&r" (u), [v] "+&r" (v), [dst] "+&r" (dst), [n] "+&r" (n)
: [acc_r] "r" (&acc_r[0]), [acc_g] "r" (&acc_g[0]), [acc_b] "r" (&acc_b[0]),
[oddflag] "r" (oddflag)
: "cc", "memory",
"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
"d8", "d9", "d10", "d11", /* "d12", "d13", "d14", "d15", */
"d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
"d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"
);
}
# endif // MOZILLA_MAY_SUPPORT_NEON
} // namespace gfx
} // namespace mozilla
#endif // HAVE_YCBCR_TO_RGB565