summaryrefslogtreecommitdiffstats
path: root/media/libjpeg/simd/arm/jdmrgext-neon.c
diff options
context:
space:
mode:
Diffstat (limited to 'media/libjpeg/simd/arm/jdmrgext-neon.c')
-rw-r--r--media/libjpeg/simd/arm/jdmrgext-neon.c723
1 files changed, 723 insertions, 0 deletions
diff --git a/media/libjpeg/simd/arm/jdmrgext-neon.c b/media/libjpeg/simd/arm/jdmrgext-neon.c
new file mode 100644
index 0000000000..5b89bdb339
--- /dev/null
+++ b/media/libjpeg/simd/arm/jdmrgext-neon.c
@@ -0,0 +1,723 @@
+/*
+ * 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
+ }
+}