You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
354 lines
15 KiB
354 lines
15 KiB
/*
|
|
* jdcolext-neon.c - colorspace 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 jdcolor-neon.c. */
|
|
|
|
|
|
/* 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 jdcolor-neon.c.
|
|
*
|
|
* To ensure correct results, rounding is used when descaling.
|
|
*/
|
|
|
|
/* Notes on safe memory access for 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.
|
|
*/
|
|
|
|
void jsimd_ycc_rgb_convert_neon(JDIMENSION output_width, JSAMPIMAGE input_buf,
|
|
JDIMENSION input_row, JSAMPARRAY output_buf,
|
|
int num_rows)
|
|
{
|
|
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);
|
|
|
|
while (--num_rows >= 0) {
|
|
inptr0 = input_buf[0][input_row];
|
|
inptr1 = input_buf[1][input_row];
|
|
inptr2 = input_buf[2][input_row];
|
|
input_row++;
|
|
outptr = *output_buf++;
|
|
int cols_remaining = output_width;
|
|
for (; cols_remaining >= 16; cols_remaining -= 16) {
|
|
uint8x16_t y = vld1q_u8(inptr0);
|
|
uint8x16_t cb = vld1q_u8(inptr1);
|
|
uint8x16_t cr = vld1q_u8(inptr2);
|
|
/* Subtract 128 from Cb and Cr. */
|
|
int16x8_t cr_128_l =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128),
|
|
vget_low_u8(cr)));
|
|
int16x8_t cr_128_h =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128),
|
|
vget_high_u8(cr)));
|
|
int16x8_t cb_128_l =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128),
|
|
vget_low_u8(cb)));
|
|
int16x8_t cb_128_h =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128),
|
|
vget_high_u8(cb)));
|
|
/* Compute G-Y: - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128) */
|
|
int32x4_t g_sub_y_ll = vmull_lane_s16(vget_low_s16(cb_128_l), consts, 0);
|
|
int32x4_t g_sub_y_lh = vmull_lane_s16(vget_high_s16(cb_128_l),
|
|
consts, 0);
|
|
int32x4_t g_sub_y_hl = vmull_lane_s16(vget_low_s16(cb_128_h), consts, 0);
|
|
int32x4_t g_sub_y_hh = vmull_lane_s16(vget_high_s16(cb_128_h),
|
|
consts, 0);
|
|
g_sub_y_ll = vmlsl_lane_s16(g_sub_y_ll, vget_low_s16(cr_128_l),
|
|
consts, 1);
|
|
g_sub_y_lh = vmlsl_lane_s16(g_sub_y_lh, vget_high_s16(cr_128_l),
|
|
consts, 1);
|
|
g_sub_y_hl = vmlsl_lane_s16(g_sub_y_hl, vget_low_s16(cr_128_h),
|
|
consts, 1);
|
|
g_sub_y_hh = vmlsl_lane_s16(g_sub_y_hh, vget_high_s16(cr_128_h),
|
|
consts, 1);
|
|
/* Descale G components: shift right 15, round, and narrow to 16-bit. */
|
|
int16x8_t g_sub_y_l = vcombine_s16(vrshrn_n_s32(g_sub_y_ll, 15),
|
|
vrshrn_n_s32(g_sub_y_lh, 15));
|
|
int16x8_t g_sub_y_h = vcombine_s16(vrshrn_n_s32(g_sub_y_hl, 15),
|
|
vrshrn_n_s32(g_sub_y_hh, 15));
|
|
/* Compute R-Y: 1.40200 * (Cr - 128) */
|
|
int16x8_t r_sub_y_l = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128_l, 1),
|
|
consts, 2);
|
|
int16x8_t r_sub_y_h = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128_h, 1),
|
|
consts, 2);
|
|
/* Compute B-Y: 1.77200 * (Cb - 128) */
|
|
int16x8_t b_sub_y_l = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128_l, 1),
|
|
consts, 3);
|
|
int16x8_t b_sub_y_h = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128_h, 1),
|
|
consts, 3);
|
|
/* Add Y. */
|
|
int16x8_t r_l =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y_l),
|
|
vget_low_u8(y)));
|
|
int16x8_t r_h =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y_h),
|
|
vget_high_u8(y)));
|
|
int16x8_t b_l =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y_l),
|
|
vget_low_u8(y)));
|
|
int16x8_t b_h =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y_h),
|
|
vget_high_u8(y)));
|
|
int16x8_t g_l =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y_l),
|
|
vget_low_u8(y)));
|
|
int16x8_t g_h =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y_h),
|
|
vget_high_u8(y)));
|
|
|
|
#if RGB_PIXELSIZE == 4
|
|
uint8x16x4_t rgba;
|
|
/* Convert each component to unsigned and narrow, clamping to [0-255]. */
|
|
rgba.val[RGB_RED] = vcombine_u8(vqmovun_s16(r_l), vqmovun_s16(r_h));
|
|
rgba.val[RGB_GREEN] = vcombine_u8(vqmovun_s16(g_l), vqmovun_s16(g_h));
|
|
rgba.val[RGB_BLUE] = vcombine_u8(vqmovun_s16(b_l), vqmovun_s16(b_h));
|
|
/* Set alpha channel to opaque (0xFF). */
|
|
rgba.val[RGB_ALPHA] = vdupq_n_u8(0xFF);
|
|
/* Store RGBA pixel data to memory. */
|
|
vst4q_u8(outptr, rgba);
|
|
#elif RGB_PIXELSIZE == 3
|
|
uint8x16x3_t rgb;
|
|
/* Convert each component to unsigned and narrow, clamping to [0-255]. */
|
|
rgb.val[RGB_RED] = vcombine_u8(vqmovun_s16(r_l), vqmovun_s16(r_h));
|
|
rgb.val[RGB_GREEN] = vcombine_u8(vqmovun_s16(g_l), vqmovun_s16(g_h));
|
|
rgb.val[RGB_BLUE] = vcombine_u8(vqmovun_s16(b_l), vqmovun_s16(b_h));
|
|
/* Store RGB pixel data to memory. */
|
|
vst3q_u8(outptr, rgb);
|
|
#else
|
|
/* Pack R, G, and B values in ratio 5:6:5. */
|
|
uint16x8_t rgb565_l = vqshluq_n_s16(r_l, 8);
|
|
rgb565_l = vsriq_n_u16(rgb565_l, vqshluq_n_s16(g_l, 8), 5);
|
|
rgb565_l = vsriq_n_u16(rgb565_l, vqshluq_n_s16(b_l, 8), 11);
|
|
uint16x8_t rgb565_h = vqshluq_n_s16(r_h, 8);
|
|
rgb565_h = vsriq_n_u16(rgb565_h, vqshluq_n_s16(g_h, 8), 5);
|
|
rgb565_h = vsriq_n_u16(rgb565_h, vqshluq_n_s16(b_h, 8), 11);
|
|
/* Store RGB pixel data to memory. */
|
|
vst1q_u16((uint16_t *)outptr, rgb565_l);
|
|
vst1q_u16(((uint16_t *)outptr) + 8, rgb565_h);
|
|
#endif
|
|
|
|
/* Increment pointers. */
|
|
inptr0 += 16;
|
|
inptr1 += 16;
|
|
inptr2 += 16;
|
|
outptr += (RGB_PIXELSIZE * 16);
|
|
}
|
|
|
|
if (cols_remaining >= 8) {
|
|
uint8x8_t y = vld1_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 Y. */
|
|
int16x8_t r =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y), y));
|
|
int16x8_t b =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y), y));
|
|
int16x8_t g =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y), y));
|
|
|
|
#if RGB_PIXELSIZE == 4
|
|
uint8x8x4_t rgba;
|
|
/* Convert each component to unsigned and narrow, clamping to [0-255]. */
|
|
rgba.val[RGB_RED] = vqmovun_s16(r);
|
|
rgba.val[RGB_GREEN] = vqmovun_s16(g);
|
|
rgba.val[RGB_BLUE] = vqmovun_s16(b);
|
|
/* Set alpha channel to opaque (0xFF). */
|
|
rgba.val[RGB_ALPHA] = vdup_n_u8(0xFF);
|
|
/* Store RGBA pixel data to memory. */
|
|
vst4_u8(outptr, rgba);
|
|
#elif RGB_PIXELSIZE == 3
|
|
uint8x8x3_t rgb;
|
|
/* Convert each component to unsigned and narrow, clamping to [0-255]. */
|
|
rgb.val[RGB_RED] = vqmovun_s16(r);
|
|
rgb.val[RGB_GREEN] = vqmovun_s16(g);
|
|
rgb.val[RGB_BLUE] = vqmovun_s16(b);
|
|
/* Store RGB pixel data to memory. */
|
|
vst3_u8(outptr, rgb);
|
|
#else
|
|
/* Pack R, G, and B values in ratio 5:6:5. */
|
|
uint16x8_t rgb565 = vqshluq_n_s16(r, 8);
|
|
rgb565 = vsriq_n_u16(rgb565, vqshluq_n_s16(g, 8), 5);
|
|
rgb565 = vsriq_n_u16(rgb565, vqshluq_n_s16(b, 8), 11);
|
|
/* Store RGB pixel data to memory. */
|
|
vst1q_u16((uint16_t *)outptr, rgb565);
|
|
#endif
|
|
|
|
/* Increment pointers. */
|
|
inptr0 += 8;
|
|
inptr1 += 8;
|
|
inptr2 += 8;
|
|
outptr += (RGB_PIXELSIZE * 8);
|
|
cols_remaining -= 8;
|
|
}
|
|
|
|
/* Handle the tail elements. */
|
|
if (cols_remaining > 0) {
|
|
uint8x8_t y = vld1_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 Y. */
|
|
int16x8_t r =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y), y));
|
|
int16x8_t b =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y), y));
|
|
int16x8_t g =
|
|
vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y), y));
|
|
|
|
#if RGB_PIXELSIZE == 4
|
|
uint8x8x4_t rgba;
|
|
/* Convert each component to unsigned and narrow, clamping to [0-255]. */
|
|
rgba.val[RGB_RED] = vqmovun_s16(r);
|
|
rgba.val[RGB_GREEN] = vqmovun_s16(g);
|
|
rgba.val[RGB_BLUE] = vqmovun_s16(b);
|
|
/* Set alpha channel to opaque (0xFF). */
|
|
rgba.val[RGB_ALPHA] = vdup_n_u8(0xFF);
|
|
/* Store RGBA pixel data to memory. */
|
|
switch (cols_remaining) {
|
|
case 7:
|
|
vst4_lane_u8(outptr + 6 * RGB_PIXELSIZE, rgba, 6);
|
|
case 6:
|
|
vst4_lane_u8(outptr + 5 * RGB_PIXELSIZE, rgba, 5);
|
|
case 5:
|
|
vst4_lane_u8(outptr + 4 * RGB_PIXELSIZE, rgba, 4);
|
|
case 4:
|
|
vst4_lane_u8(outptr + 3 * RGB_PIXELSIZE, rgba, 3);
|
|
case 3:
|
|
vst4_lane_u8(outptr + 2 * RGB_PIXELSIZE, rgba, 2);
|
|
case 2:
|
|
vst4_lane_u8(outptr + RGB_PIXELSIZE, rgba, 1);
|
|
case 1:
|
|
vst4_lane_u8(outptr, rgba, 0);
|
|
default:
|
|
break;
|
|
}
|
|
#elif RGB_PIXELSIZE == 3
|
|
uint8x8x3_t rgb;
|
|
/* Convert each component to unsigned and narrow, clamping to [0-255]. */
|
|
rgb.val[RGB_RED] = vqmovun_s16(r);
|
|
rgb.val[RGB_GREEN] = vqmovun_s16(g);
|
|
rgb.val[RGB_BLUE] = vqmovun_s16(b);
|
|
/* Store RGB pixel data to memory. */
|
|
switch (cols_remaining) {
|
|
case 7:
|
|
vst3_lane_u8(outptr + 6 * RGB_PIXELSIZE, rgb, 6);
|
|
case 6:
|
|
vst3_lane_u8(outptr + 5 * RGB_PIXELSIZE, rgb, 5);
|
|
case 5:
|
|
vst3_lane_u8(outptr + 4 * RGB_PIXELSIZE, rgb, 4);
|
|
case 4:
|
|
vst3_lane_u8(outptr + 3 * RGB_PIXELSIZE, rgb, 3);
|
|
case 3:
|
|
vst3_lane_u8(outptr + 2 * RGB_PIXELSIZE, rgb, 2);
|
|
case 2:
|
|
vst3_lane_u8(outptr + RGB_PIXELSIZE, rgb, 1);
|
|
case 1:
|
|
vst3_lane_u8(outptr, rgb, 0);
|
|
default:
|
|
break;
|
|
}
|
|
#else
|
|
/* Pack R, G, and B values in ratio 5:6:5. */
|
|
uint16x8_t rgb565 = vqshluq_n_s16(r, 8);
|
|
rgb565 = vsriq_n_u16(rgb565, vqshluq_n_s16(g, 8), 5);
|
|
rgb565 = vsriq_n_u16(rgb565, vqshluq_n_s16(b, 8), 11);
|
|
/* Store RGB565 pixel data to memory. */
|
|
switch (cols_remaining) {
|
|
case 7:
|
|
vst1q_lane_u16((uint16_t *)(outptr + 6 * RGB_PIXELSIZE), rgb565, 6);
|
|
case 6:
|
|
vst1q_lane_u16((uint16_t *)(outptr + 5 * RGB_PIXELSIZE), rgb565, 5);
|
|
case 5:
|
|
vst1q_lane_u16((uint16_t *)(outptr + 4 * RGB_PIXELSIZE), rgb565, 4);
|
|
case 4:
|
|
vst1q_lane_u16((uint16_t *)(outptr + 3 * RGB_PIXELSIZE), rgb565, 3);
|
|
case 3:
|
|
vst1q_lane_u16((uint16_t *)(outptr + 2 * RGB_PIXELSIZE), rgb565, 2);
|
|
case 2:
|
|
vst1q_lane_u16((uint16_t *)(outptr + RGB_PIXELSIZE), rgb565, 1);
|
|
case 1:
|
|
vst1q_lane_u16((uint16_t *)outptr, rgb565, 0);
|
|
default:
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
}
|