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jdmrgext-neon.c
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/*
* jdmrgext-neon.c - merged upsampling/color conversion (Arm Neon)
*
* Copyright (C) 2020, Arm Limited. All Rights Reserved.
* Copyright (C) 2020, D. R. Commander. All Rights Reserved.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
/* This file is included by jdmerge-neon.c. */
/* These routines combine simple (non-fancy, i.e. non-smooth) h2v1 or h2v2
* chroma upsampling and YCbCr -> RGB color conversion into a single function.
*
* As with the standalone functions, YCbCr -> RGB conversion is defined by the
* following equations:
* R = Y + 1.40200 * (Cr - 128)
* G = Y - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128)
* B = Y + 1.77200 * (Cb - 128)
*
* Scaled integer constants are used to avoid floating-point arithmetic:
* 0.3441467 = 11277 * 2^-15
* 0.7141418 = 23401 * 2^-15
* 1.4020386 = 22971 * 2^-14
* 1.7720337 = 29033 * 2^-14
* These constants are defined in jdmerge-neon.c.
*
* To ensure correct results, rounding is used when descaling.
*/
/* Notes on safe memory access for merged upsampling/YCbCr -> RGB conversion
* routines:
*
* Input memory buffers can be safely overread up to the next multiple of
* ALIGN_SIZE bytes, since they are always allocated by alloc_sarray() in
* jmemmgr.c.
*
* The output buffer cannot safely be written beyond output_width, since
* output_buf points to a possibly unpadded row in the decompressed image
* buffer allocated by the calling program.
*/
/* Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
*/
void jsimd_h2v1_merged_upsample_neon(JDIMENSION output_width,
JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr,
JSAMPARRAY output_buf)
{
JSAMPROW outptr;
/* Pointers to Y, Cb, and Cr data */
JSAMPROW inptr0, inptr1, inptr2;
const int16x4_t consts = vld1_s16(jsimd_ycc_rgb_convert_neon_consts);
const int16x8_t neg_128 = vdupq_n_s16(-128);
inptr0 = input_buf[0][in_row_group_ctr];
inptr1 = input_buf[1][in_row_group_ctr];
inptr2 = input_buf[2][in_row_group_ctr];
outptr = output_buf[0];
int cols_remaining = output_width;
for (; cols_remaining >= 16; cols_remaining -= 16) {
/* De-interleave Y component values into two separate vectors, one
* containing the component values with even-numbered indices and one
* containing the component values with odd-numbered indices.
*/
uint8x8x2_t y = vld2_u8(inptr0);
uint8x8_t cb = vld1_u8(inptr1);
uint8x8_t cr = vld1_u8(inptr2);
/* Subtract 128 from Cb and Cr. */
int16x8_t cr_128 =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cr));
int16x8_t cb_128 =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cb));
/* Compute G-Y: - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128) */
int32x4_t g_sub_y_l = vmull_lane_s16(vget_low_s16(cb_128), consts, 0);
int32x4_t g_sub_y_h = vmull_lane_s16(vget_high_s16(cb_128), consts, 0);
g_sub_y_l = vmlsl_lane_s16(g_sub_y_l, vget_low_s16(cr_128), consts, 1);
g_sub_y_h = vmlsl_lane_s16(g_sub_y_h, vget_high_s16(cr_128), consts, 1);
/* Descale G components: shift right 15, round, and narrow to 16-bit. */
int16x8_t g_sub_y = vcombine_s16(vrshrn_n_s32(g_sub_y_l, 15),
vrshrn_n_s32(g_sub_y_h, 15));
/* Compute R-Y: 1.40200 * (Cr - 128) */
int16x8_t r_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128, 1), consts, 2);
/* Compute B-Y: 1.77200 * (Cb - 128) */
int16x8_t b_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128, 1), consts, 3);
/* Add the chroma-derived values (G-Y, R-Y, and B-Y) to both the "even" and
* "odd" Y component values. This effectively upsamples the chroma
* components horizontally.
*/
int16x8_t g_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y.val[0]));
int16x8_t r_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y.val[0]));
int16x8_t b_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y.val[0]));
int16x8_t g_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y.val[1]));
int16x8_t r_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y.val[1]));
int16x8_t b_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y.val[1]));
/* Convert each component to unsigned and narrow, clamping to [0-255].
* Re-interleave the "even" and "odd" component values.
*/
uint8x8x2_t r = vzip_u8(vqmovun_s16(r_even), vqmovun_s16(r_odd));
uint8x8x2_t g = vzip_u8(vqmovun_s16(g_even), vqmovun_s16(g_odd));
uint8x8x2_t b = vzip_u8(vqmovun_s16(b_even), vqmovun_s16(b_odd));
#ifdef RGB_ALPHA
uint8x16x4_t rgba;
rgba.val[RGB_RED] = vcombine_u8(r.val[0], r.val[1]);
rgba.val[RGB_GREEN] = vcombine_u8(g.val[0], g.val[1]);
rgba.val[RGB_BLUE] = vcombine_u8(b.val[0], b.val[1]);
/* Set alpha channel to opaque (0xFF). */
rgba.val[RGB_ALPHA] = vdupq_n_u8(0xFF);
/* Store RGBA pixel data to memory. */
vst4q_u8(outptr, rgba);
#else
uint8x16x3_t rgb;
rgb.val[RGB_RED] = vcombine_u8(r.val[0], r.val[1]);
rgb.val[RGB_GREEN] = vcombine_u8(g.val[0], g.val[1]);
rgb.val[RGB_BLUE] = vcombine_u8(b.val[0], b.val[1]);
/* Store RGB pixel data to memory. */
vst3q_u8(outptr, rgb);
#endif
/* Increment pointers. */
inptr0 += 16;
inptr1 += 8;
inptr2 += 8;
outptr += (RGB_PIXELSIZE * 16);
}
if (cols_remaining > 0) {
/* De-interleave Y component values into two separate vectors, one
* containing the component values with even-numbered indices and one
* containing the component values with odd-numbered indices.
*/
uint8x8x2_t y = vld2_u8(inptr0);
uint8x8_t cb = vld1_u8(inptr1);
uint8x8_t cr = vld1_u8(inptr2);
/* Subtract 128 from Cb and Cr. */
int16x8_t cr_128 =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cr));
int16x8_t cb_128 =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cb));
/* Compute G-Y: - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128) */
int32x4_t g_sub_y_l = vmull_lane_s16(vget_low_s16(cb_128), consts, 0);
int32x4_t g_sub_y_h = vmull_lane_s16(vget_high_s16(cb_128), consts, 0);
g_sub_y_l = vmlsl_lane_s16(g_sub_y_l, vget_low_s16(cr_128), consts, 1);
g_sub_y_h = vmlsl_lane_s16(g_sub_y_h, vget_high_s16(cr_128), consts, 1);
/* Descale G components: shift right 15, round, and narrow to 16-bit. */
int16x8_t g_sub_y = vcombine_s16(vrshrn_n_s32(g_sub_y_l, 15),
vrshrn_n_s32(g_sub_y_h, 15));
/* Compute R-Y: 1.40200 * (Cr - 128) */
int16x8_t r_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128, 1), consts, 2);
/* Compute B-Y: 1.77200 * (Cb - 128) */
int16x8_t b_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128, 1), consts, 3);
/* Add the chroma-derived values (G-Y, R-Y, and B-Y) to both the "even" and
* "odd" Y component values. This effectively upsamples the chroma
* components horizontally.
*/
int16x8_t g_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y.val[0]));
int16x8_t r_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y.val[0]));
int16x8_t b_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y.val[0]));
int16x8_t g_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y.val[1]));
int16x8_t r_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y.val[1]));
int16x8_t b_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y.val[1]));
/* Convert each component to unsigned and narrow, clamping to [0-255].
* Re-interleave the "even" and "odd" component values.
*/
uint8x8x2_t r = vzip_u8(vqmovun_s16(r_even), vqmovun_s16(r_odd));
uint8x8x2_t g = vzip_u8(vqmovun_s16(g_even), vqmovun_s16(g_odd));
uint8x8x2_t b = vzip_u8(vqmovun_s16(b_even), vqmovun_s16(b_odd));
#ifdef RGB_ALPHA
uint8x8x4_t rgba_h;
rgba_h.val[RGB_RED] = r.val[1];
rgba_h.val[RGB_GREEN] = g.val[1];
rgba_h.val[RGB_BLUE] = b.val[1];
/* Set alpha channel to opaque (0xFF). */
rgba_h.val[RGB_ALPHA] = vdup_n_u8(0xFF);
uint8x8x4_t rgba_l;
rgba_l.val[RGB_RED] = r.val[0];
rgba_l.val[RGB_GREEN] = g.val[0];
rgba_l.val[RGB_BLUE] = b.val[0];
/* Set alpha channel to opaque (0xFF). */
rgba_l.val[RGB_ALPHA] = vdup_n_u8(0xFF);
/* Store RGBA pixel data to memory. */
switch (cols_remaining) {
case 15:
vst4_lane_u8(outptr + 14 * RGB_PIXELSIZE, rgba_h, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 14:
vst4_lane_u8(outptr + 13 * RGB_PIXELSIZE, rgba_h, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 13:
vst4_lane_u8(outptr + 12 * RGB_PIXELSIZE, rgba_h, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 12:
vst4_lane_u8(outptr + 11 * RGB_PIXELSIZE, rgba_h, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 11:
vst4_lane_u8(outptr + 10 * RGB_PIXELSIZE, rgba_h, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 10:
vst4_lane_u8(outptr + 9 * RGB_PIXELSIZE, rgba_h, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 9:
vst4_lane_u8(outptr + 8 * RGB_PIXELSIZE, rgba_h, 0);
FALLTHROUGH /*FALLTHROUGH*/
case 8:
vst4_u8(outptr, rgba_l);
break;
case 7:
vst4_lane_u8(outptr + 6 * RGB_PIXELSIZE, rgba_l, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 6:
vst4_lane_u8(outptr + 5 * RGB_PIXELSIZE, rgba_l, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 5:
vst4_lane_u8(outptr + 4 * RGB_PIXELSIZE, rgba_l, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 4:
vst4_lane_u8(outptr + 3 * RGB_PIXELSIZE, rgba_l, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 3:
vst4_lane_u8(outptr + 2 * RGB_PIXELSIZE, rgba_l, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 2:
vst4_lane_u8(outptr + RGB_PIXELSIZE, rgba_l, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 1:
vst4_lane_u8(outptr, rgba_l, 0);
FALLTHROUGH /*FALLTHROUGH*/
default:
break;
}
#else
uint8x8x3_t rgb_h;
rgb_h.val[RGB_RED] = r.val[1];
rgb_h.val[RGB_GREEN] = g.val[1];
rgb_h.val[RGB_BLUE] = b.val[1];
uint8x8x3_t rgb_l;
rgb_l.val[RGB_RED] = r.val[0];
rgb_l.val[RGB_GREEN] = g.val[0];
rgb_l.val[RGB_BLUE] = b.val[0];
/* Store RGB pixel data to memory. */
switch (cols_remaining) {
case 15:
vst3_lane_u8(outptr + 14 * RGB_PIXELSIZE, rgb_h, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 14:
vst3_lane_u8(outptr + 13 * RGB_PIXELSIZE, rgb_h, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 13:
vst3_lane_u8(outptr + 12 * RGB_PIXELSIZE, rgb_h, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 12:
vst3_lane_u8(outptr + 11 * RGB_PIXELSIZE, rgb_h, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 11:
vst3_lane_u8(outptr + 10 * RGB_PIXELSIZE, rgb_h, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 10:
vst3_lane_u8(outptr + 9 * RGB_PIXELSIZE, rgb_h, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 9:
vst3_lane_u8(outptr + 8 * RGB_PIXELSIZE, rgb_h, 0);
FALLTHROUGH /*FALLTHROUGH*/
case 8:
vst3_u8(outptr, rgb_l);
break;
case 7:
vst3_lane_u8(outptr + 6 * RGB_PIXELSIZE, rgb_l, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 6:
vst3_lane_u8(outptr + 5 * RGB_PIXELSIZE, rgb_l, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 5:
vst3_lane_u8(outptr + 4 * RGB_PIXELSIZE, rgb_l, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 4:
vst3_lane_u8(outptr + 3 * RGB_PIXELSIZE, rgb_l, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 3:
vst3_lane_u8(outptr + 2 * RGB_PIXELSIZE, rgb_l, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 2:
vst3_lane_u8(outptr + RGB_PIXELSIZE, rgb_l, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 1:
vst3_lane_u8(outptr, rgb_l, 0);
FALLTHROUGH /*FALLTHROUGH*/
default:
break;
}
#endif
}
}
/* Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
*
* See comments above for details regarding color conversion and safe memory
* access.
*/
void jsimd_h2v2_merged_upsample_neon(JDIMENSION output_width,
JSAMPIMAGE input_buf,
JDIMENSION in_row_group_ctr,
JSAMPARRAY output_buf)
{
JSAMPROW outptr0, outptr1;
/* Pointers to Y (both rows), Cb, and Cr data */
JSAMPROW inptr0_0, inptr0_1, inptr1, inptr2;
const int16x4_t consts = vld1_s16(jsimd_ycc_rgb_convert_neon_consts);
const int16x8_t neg_128 = vdupq_n_s16(-128);
inptr0_0 = input_buf[0][in_row_group_ctr * 2];
inptr0_1 = input_buf[0][in_row_group_ctr * 2 + 1];
inptr1 = input_buf[1][in_row_group_ctr];
inptr2 = input_buf[2][in_row_group_ctr];
outptr0 = output_buf[0];
outptr1 = output_buf[1];
int cols_remaining = output_width;
for (; cols_remaining >= 16; cols_remaining -= 16) {
/* For each row, de-interleave Y component values into two separate
* vectors, one containing the component values with even-numbered indices
* and one containing the component values with odd-numbered indices.
*/
uint8x8x2_t y0 = vld2_u8(inptr0_0);
uint8x8x2_t y1 = vld2_u8(inptr0_1);
uint8x8_t cb = vld1_u8(inptr1);
uint8x8_t cr = vld1_u8(inptr2);
/* Subtract 128 from Cb and Cr. */
int16x8_t cr_128 =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cr));
int16x8_t cb_128 =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cb));
/* Compute G-Y: - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128) */
int32x4_t g_sub_y_l = vmull_lane_s16(vget_low_s16(cb_128), consts, 0);
int32x4_t g_sub_y_h = vmull_lane_s16(vget_high_s16(cb_128), consts, 0);
g_sub_y_l = vmlsl_lane_s16(g_sub_y_l, vget_low_s16(cr_128), consts, 1);
g_sub_y_h = vmlsl_lane_s16(g_sub_y_h, vget_high_s16(cr_128), consts, 1);
/* Descale G components: shift right 15, round, and narrow to 16-bit. */
int16x8_t g_sub_y = vcombine_s16(vrshrn_n_s32(g_sub_y_l, 15),
vrshrn_n_s32(g_sub_y_h, 15));
/* Compute R-Y: 1.40200 * (Cr - 128) */
int16x8_t r_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128, 1), consts, 2);
/* Compute B-Y: 1.77200 * (Cb - 128) */
int16x8_t b_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128, 1), consts, 3);
/* For each row, add the chroma-derived values (G-Y, R-Y, and B-Y) to both
* the "even" and "odd" Y component values. This effectively upsamples the
* chroma components both horizontally and vertically.
*/
int16x8_t g0_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y0.val[0]));
int16x8_t r0_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y0.val[0]));
int16x8_t b0_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y0.val[0]));
int16x8_t g0_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y0.val[1]));
int16x8_t r0_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y0.val[1]));
int16x8_t b0_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y0.val[1]));
int16x8_t g1_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y1.val[0]));
int16x8_t r1_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y1.val[0]));
int16x8_t b1_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y1.val[0]));
int16x8_t g1_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y1.val[1]));
int16x8_t r1_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y1.val[1]));
int16x8_t b1_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y1.val[1]));
/* Convert each component to unsigned and narrow, clamping to [0-255].
* Re-interleave the "even" and "odd" component values.
*/
uint8x8x2_t r0 = vzip_u8(vqmovun_s16(r0_even), vqmovun_s16(r0_odd));
uint8x8x2_t r1 = vzip_u8(vqmovun_s16(r1_even), vqmovun_s16(r1_odd));
uint8x8x2_t g0 = vzip_u8(vqmovun_s16(g0_even), vqmovun_s16(g0_odd));
uint8x8x2_t g1 = vzip_u8(vqmovun_s16(g1_even), vqmovun_s16(g1_odd));
uint8x8x2_t b0 = vzip_u8(vqmovun_s16(b0_even), vqmovun_s16(b0_odd));
uint8x8x2_t b1 = vzip_u8(vqmovun_s16(b1_even), vqmovun_s16(b1_odd));
#ifdef RGB_ALPHA
uint8x16x4_t rgba0, rgba1;
rgba0.val[RGB_RED] = vcombine_u8(r0.val[0], r0.val[1]);
rgba1.val[RGB_RED] = vcombine_u8(r1.val[0], r1.val[1]);
rgba0.val[RGB_GREEN] = vcombine_u8(g0.val[0], g0.val[1]);
rgba1.val[RGB_GREEN] = vcombine_u8(g1.val[0], g1.val[1]);
rgba0.val[RGB_BLUE] = vcombine_u8(b0.val[0], b0.val[1]);
rgba1.val[RGB_BLUE] = vcombine_u8(b1.val[0], b1.val[1]);
/* Set alpha channel to opaque (0xFF). */
rgba0.val[RGB_ALPHA] = vdupq_n_u8(0xFF);
rgba1.val[RGB_ALPHA] = vdupq_n_u8(0xFF);
/* Store RGBA pixel data to memory. */
vst4q_u8(outptr0, rgba0);
vst4q_u8(outptr1, rgba1);
#else
uint8x16x3_t rgb0, rgb1;
rgb0.val[RGB_RED] = vcombine_u8(r0.val[0], r0.val[1]);
rgb1.val[RGB_RED] = vcombine_u8(r1.val[0], r1.val[1]);
rgb0.val[RGB_GREEN] = vcombine_u8(g0.val[0], g0.val[1]);
rgb1.val[RGB_GREEN] = vcombine_u8(g1.val[0], g1.val[1]);
rgb0.val[RGB_BLUE] = vcombine_u8(b0.val[0], b0.val[1]);
rgb1.val[RGB_BLUE] = vcombine_u8(b1.val[0], b1.val[1]);
/* Store RGB pixel data to memory. */
vst3q_u8(outptr0, rgb0);
vst3q_u8(outptr1, rgb1);
#endif
/* Increment pointers. */
inptr0_0 += 16;
inptr0_1 += 16;
inptr1 += 8;
inptr2 += 8;
outptr0 += (RGB_PIXELSIZE * 16);
outptr1 += (RGB_PIXELSIZE * 16);
}
if (cols_remaining > 0) {
/* For each row, de-interleave Y component values into two separate
* vectors, one containing the component values with even-numbered indices
* and one containing the component values with odd-numbered indices.
*/
uint8x8x2_t y0 = vld2_u8(inptr0_0);
uint8x8x2_t y1 = vld2_u8(inptr0_1);
uint8x8_t cb = vld1_u8(inptr1);
uint8x8_t cr = vld1_u8(inptr2);
/* Subtract 128 from Cb and Cr. */
int16x8_t cr_128 =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cr));
int16x8_t cb_128 =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cb));
/* Compute G-Y: - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128) */
int32x4_t g_sub_y_l = vmull_lane_s16(vget_low_s16(cb_128), consts, 0);
int32x4_t g_sub_y_h = vmull_lane_s16(vget_high_s16(cb_128), consts, 0);
g_sub_y_l = vmlsl_lane_s16(g_sub_y_l, vget_low_s16(cr_128), consts, 1);
g_sub_y_h = vmlsl_lane_s16(g_sub_y_h, vget_high_s16(cr_128), consts, 1);
/* Descale G components: shift right 15, round, and narrow to 16-bit. */
int16x8_t g_sub_y = vcombine_s16(vrshrn_n_s32(g_sub_y_l, 15),
vrshrn_n_s32(g_sub_y_h, 15));
/* Compute R-Y: 1.40200 * (Cr - 128) */
int16x8_t r_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128, 1), consts, 2);
/* Compute B-Y: 1.77200 * (Cb - 128) */
int16x8_t b_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128, 1), consts, 3);
/* For each row, add the chroma-derived values (G-Y, R-Y, and B-Y) to both
* the "even" and "odd" Y component values. This effectively upsamples the
* chroma components both horizontally and vertically.
*/
int16x8_t g0_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y0.val[0]));
int16x8_t r0_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y0.val[0]));
int16x8_t b0_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y0.val[0]));
int16x8_t g0_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y0.val[1]));
int16x8_t r0_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y0.val[1]));
int16x8_t b0_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y0.val[1]));
int16x8_t g1_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y1.val[0]));
int16x8_t r1_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y1.val[0]));
int16x8_t b1_even =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y1.val[0]));
int16x8_t g1_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y),
y1.val[1]));
int16x8_t r1_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y),
y1.val[1]));
int16x8_t b1_odd =
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y),
y1.val[1]));
/* Convert each component to unsigned and narrow, clamping to [0-255].
* Re-interleave the "even" and "odd" component values.
*/
uint8x8x2_t r0 = vzip_u8(vqmovun_s16(r0_even), vqmovun_s16(r0_odd));
uint8x8x2_t r1 = vzip_u8(vqmovun_s16(r1_even), vqmovun_s16(r1_odd));
uint8x8x2_t g0 = vzip_u8(vqmovun_s16(g0_even), vqmovun_s16(g0_odd));
uint8x8x2_t g1 = vzip_u8(vqmovun_s16(g1_even), vqmovun_s16(g1_odd));
uint8x8x2_t b0 = vzip_u8(vqmovun_s16(b0_even), vqmovun_s16(b0_odd));
uint8x8x2_t b1 = vzip_u8(vqmovun_s16(b1_even), vqmovun_s16(b1_odd));
#ifdef RGB_ALPHA
uint8x8x4_t rgba0_h, rgba1_h;
rgba0_h.val[RGB_RED] = r0.val[1];
rgba1_h.val[RGB_RED] = r1.val[1];
rgba0_h.val[RGB_GREEN] = g0.val[1];
rgba1_h.val[RGB_GREEN] = g1.val[1];
rgba0_h.val[RGB_BLUE] = b0.val[1];
rgba1_h.val[RGB_BLUE] = b1.val[1];
/* Set alpha channel to opaque (0xFF). */
rgba0_h.val[RGB_ALPHA] = vdup_n_u8(0xFF);
rgba1_h.val[RGB_ALPHA] = vdup_n_u8(0xFF);
uint8x8x4_t rgba0_l, rgba1_l;
rgba0_l.val[RGB_RED] = r0.val[0];
rgba1_l.val[RGB_RED] = r1.val[0];
rgba0_l.val[RGB_GREEN] = g0.val[0];
rgba1_l.val[RGB_GREEN] = g1.val[0];
rgba0_l.val[RGB_BLUE] = b0.val[0];
rgba1_l.val[RGB_BLUE] = b1.val[0];
/* Set alpha channel to opaque (0xFF). */
rgba0_l.val[RGB_ALPHA] = vdup_n_u8(0xFF);
rgba1_l.val[RGB_ALPHA] = vdup_n_u8(0xFF);
/* Store RGBA pixel data to memory. */
switch (cols_remaining) {
case 15:
vst4_lane_u8(outptr0 + 14 * RGB_PIXELSIZE, rgba0_h, 6);
vst4_lane_u8(outptr1 + 14 * RGB_PIXELSIZE, rgba1_h, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 14:
vst4_lane_u8(outptr0 + 13 * RGB_PIXELSIZE, rgba0_h, 5);
vst4_lane_u8(outptr1 + 13 * RGB_PIXELSIZE, rgba1_h, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 13:
vst4_lane_u8(outptr0 + 12 * RGB_PIXELSIZE, rgba0_h, 4);
vst4_lane_u8(outptr1 + 12 * RGB_PIXELSIZE, rgba1_h, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 12:
vst4_lane_u8(outptr0 + 11 * RGB_PIXELSIZE, rgba0_h, 3);
vst4_lane_u8(outptr1 + 11 * RGB_PIXELSIZE, rgba1_h, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 11:
vst4_lane_u8(outptr0 + 10 * RGB_PIXELSIZE, rgba0_h, 2);
vst4_lane_u8(outptr1 + 10 * RGB_PIXELSIZE, rgba1_h, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 10:
vst4_lane_u8(outptr0 + 9 * RGB_PIXELSIZE, rgba0_h, 1);
vst4_lane_u8(outptr1 + 9 * RGB_PIXELSIZE, rgba1_h, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 9:
vst4_lane_u8(outptr0 + 8 * RGB_PIXELSIZE, rgba0_h, 0);
vst4_lane_u8(outptr1 + 8 * RGB_PIXELSIZE, rgba1_h, 0);
FALLTHROUGH /*FALLTHROUGH*/
case 8:
vst4_u8(outptr0, rgba0_l);
vst4_u8(outptr1, rgba1_l);
break;
case 7:
vst4_lane_u8(outptr0 + 6 * RGB_PIXELSIZE, rgba0_l, 6);
vst4_lane_u8(outptr1 + 6 * RGB_PIXELSIZE, rgba1_l, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 6:
vst4_lane_u8(outptr0 + 5 * RGB_PIXELSIZE, rgba0_l, 5);
vst4_lane_u8(outptr1 + 5 * RGB_PIXELSIZE, rgba1_l, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 5:
vst4_lane_u8(outptr0 + 4 * RGB_PIXELSIZE, rgba0_l, 4);
vst4_lane_u8(outptr1 + 4 * RGB_PIXELSIZE, rgba1_l, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 4:
vst4_lane_u8(outptr0 + 3 * RGB_PIXELSIZE, rgba0_l, 3);
vst4_lane_u8(outptr1 + 3 * RGB_PIXELSIZE, rgba1_l, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 3:
vst4_lane_u8(outptr0 + 2 * RGB_PIXELSIZE, rgba0_l, 2);
vst4_lane_u8(outptr1 + 2 * RGB_PIXELSIZE, rgba1_l, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 2:
vst4_lane_u8(outptr0 + 1 * RGB_PIXELSIZE, rgba0_l, 1);
vst4_lane_u8(outptr1 + 1 * RGB_PIXELSIZE, rgba1_l, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 1:
vst4_lane_u8(outptr0, rgba0_l, 0);
vst4_lane_u8(outptr1, rgba1_l, 0);
FALLTHROUGH /*FALLTHROUGH*/
default:
break;
}
#else
uint8x8x3_t rgb0_h, rgb1_h;
rgb0_h.val[RGB_RED] = r0.val[1];
rgb1_h.val[RGB_RED] = r1.val[1];
rgb0_h.val[RGB_GREEN] = g0.val[1];
rgb1_h.val[RGB_GREEN] = g1.val[1];
rgb0_h.val[RGB_BLUE] = b0.val[1];
rgb1_h.val[RGB_BLUE] = b1.val[1];
uint8x8x3_t rgb0_l, rgb1_l;
rgb0_l.val[RGB_RED] = r0.val[0];
rgb1_l.val[RGB_RED] = r1.val[0];
rgb0_l.val[RGB_GREEN] = g0.val[0];
rgb1_l.val[RGB_GREEN] = g1.val[0];
rgb0_l.val[RGB_BLUE] = b0.val[0];
rgb1_l.val[RGB_BLUE] = b1.val[0];
/* Store RGB pixel data to memory. */
switch (cols_remaining) {
case 15:
vst3_lane_u8(outptr0 + 14 * RGB_PIXELSIZE, rgb0_h, 6);
vst3_lane_u8(outptr1 + 14 * RGB_PIXELSIZE, rgb1_h, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 14:
vst3_lane_u8(outptr0 + 13 * RGB_PIXELSIZE, rgb0_h, 5);
vst3_lane_u8(outptr1 + 13 * RGB_PIXELSIZE, rgb1_h, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 13:
vst3_lane_u8(outptr0 + 12 * RGB_PIXELSIZE, rgb0_h, 4);
vst3_lane_u8(outptr1 + 12 * RGB_PIXELSIZE, rgb1_h, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 12:
vst3_lane_u8(outptr0 + 11 * RGB_PIXELSIZE, rgb0_h, 3);
vst3_lane_u8(outptr1 + 11 * RGB_PIXELSIZE, rgb1_h, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 11:
vst3_lane_u8(outptr0 + 10 * RGB_PIXELSIZE, rgb0_h, 2);
vst3_lane_u8(outptr1 + 10 * RGB_PIXELSIZE, rgb1_h, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 10:
vst3_lane_u8(outptr0 + 9 * RGB_PIXELSIZE, rgb0_h, 1);
vst3_lane_u8(outptr1 + 9 * RGB_PIXELSIZE, rgb1_h, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 9:
vst3_lane_u8(outptr0 + 8 * RGB_PIXELSIZE, rgb0_h, 0);
vst3_lane_u8(outptr1 + 8 * RGB_PIXELSIZE, rgb1_h, 0);
FALLTHROUGH /*FALLTHROUGH*/
case 8:
vst3_u8(outptr0, rgb0_l);
vst3_u8(outptr1, rgb1_l);
break;
case 7:
vst3_lane_u8(outptr0 + 6 * RGB_PIXELSIZE, rgb0_l, 6);
vst3_lane_u8(outptr1 + 6 * RGB_PIXELSIZE, rgb1_l, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 6:
vst3_lane_u8(outptr0 + 5 * RGB_PIXELSIZE, rgb0_l, 5);
vst3_lane_u8(outptr1 + 5 * RGB_PIXELSIZE, rgb1_l, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 5:
vst3_lane_u8(outptr0 + 4 * RGB_PIXELSIZE, rgb0_l, 4);
vst3_lane_u8(outptr1 + 4 * RGB_PIXELSIZE, rgb1_l, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 4:
vst3_lane_u8(outptr0 + 3 * RGB_PIXELSIZE, rgb0_l, 3);
vst3_lane_u8(outptr1 + 3 * RGB_PIXELSIZE, rgb1_l, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 3:
vst3_lane_u8(outptr0 + 2 * RGB_PIXELSIZE, rgb0_l, 2);
vst3_lane_u8(outptr1 + 2 * RGB_PIXELSIZE, rgb1_l, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 2:
vst3_lane_u8(outptr0 + 1 * RGB_PIXELSIZE, rgb0_l, 1);
vst3_lane_u8(outptr1 + 1 * RGB_PIXELSIZE, rgb1_l, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 1:
vst3_lane_u8(outptr0, rgb0_l, 0);
vst3_lane_u8(outptr1, rgb1_l, 0);
FALLTHROUGH /*FALLTHROUGH*/
default:
break;
}
#endif
}
}