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mat_pixel.cpp
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mat_pixel.cpp
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// Tencent is pleased to support the open source community by making ncnn available.
//
// Copyright (C) 2017 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
#include "mat.h"
#include <limits.h>
#if __ARM_NEON
#include <arm_neon.h>
#endif // __ARM_NEON
#include "platform.h"
namespace ncnn {
#if NCNN_PIXEL
static int from_rgb(const unsigned char* rgb, int w, int h, int stride, Mat& m, Allocator* allocator)
{
m.create(w, h, 3, 4u, allocator);
if (m.empty())
return -100;
const int wgap = stride - w * 3;
if (wgap == 0)
{
w = w * h;
h = 1;
}
float* ptr0 = m.channel(0);
float* ptr1 = m.channel(1);
float* ptr2 = m.channel(2);
for (int y = 0; y < h; y++)
{
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
#if !NCNN_GNU_INLINE_ASM || __aarch64__
for (; nn > 0; nn--)
{
uint8x8x3_t _rgb = vld3_u8(rgb);
uint16x8_t _r16 = vmovl_u8(_rgb.val[0]);
uint16x8_t _g16 = vmovl_u8(_rgb.val[1]);
uint16x8_t _b16 = vmovl_u8(_rgb.val[2]);
float32x4_t _rlow = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_r16)));
float32x4_t _rhigh = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_r16)));
float32x4_t _glow = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_g16)));
float32x4_t _ghigh = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_g16)));
float32x4_t _blow = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_b16)));
float32x4_t _bhigh = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_b16)));
vst1q_f32(ptr0, _rlow);
vst1q_f32(ptr0 + 4, _rhigh);
vst1q_f32(ptr1, _glow);
vst1q_f32(ptr1 + 4, _ghigh);
vst1q_f32(ptr2, _blow);
vst1q_f32(ptr2 + 4, _bhigh);
rgb += 3 * 8;
ptr0 += 8;
ptr1 += 8;
ptr2 += 8;
}
#else
if (nn > 0)
{
asm volatile(
"0: \n"
"pld [%1, #256] \n"
"vld3.u8 {d0-d2}, [%1]! \n"
"vmovl.u8 q8, d0 \n"
"vmovl.u8 q9, d1 \n"
"vmovl.u8 q10, d2 \n"
"vmovl.u16 q0, d16 \n"
"vmovl.u16 q1, d17 \n"
"vmovl.u16 q2, d18 \n"
"vmovl.u16 q3, d19 \n"
"vmovl.u16 q8, d20 \n"
"vmovl.u16 q9, d21 \n"
"vcvt.f32.u32 q0, q0 \n"
"vcvt.f32.u32 q1, q1 \n"
"vcvt.f32.u32 q2, q2 \n"
"vcvt.f32.u32 q3, q3 \n"
"vcvt.f32.u32 q8, q8 \n"
"subs %0, #1 \n"
"vst1.f32 {d0-d3}, [%2]! \n"
"vcvt.f32.u32 q9, q9 \n"
"vst1.f32 {d4-d7}, [%3]! \n"
"vst1.f32 {d16-d19}, [%4]! \n"
"bne 0b \n"
: "=r"(nn), // %0
"=r"(rgb), // %1
"=r"(ptr0), // %2
"=r"(ptr1), // %3
"=r"(ptr2) // %4
: "0"(nn),
"1"(rgb),
"2"(ptr0),
"3"(ptr1),
"4"(ptr2)
: "cc", "memory", "q0", "q1", "q2", "q3", "q8", "q9", "q10");
}
#endif // __aarch64__
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
*ptr0 = rgb[0];
*ptr1 = rgb[1];
*ptr2 = rgb[2];
rgb += 3;
ptr0++;
ptr1++;
ptr2++;
}
rgb += wgap;
}
return 0;
}
static void to_rgb(const Mat& m, unsigned char* rgb, int stride)
{
int w = m.w;
int h = m.h;
const int wgap = stride - w * 3;
if (wgap == 0)
{
w = w * h;
h = 1;
}
const float* ptr0 = m.channel(0);
const float* ptr1 = m.channel(1);
const float* ptr2 = m.channel(2);
for (int y = 0; y < h; y++)
{
#define SATURATE_CAST_UCHAR(X) (unsigned char)::std::min(::std::max((int)(X), 0), 255);
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
for (; nn > 0; nn--)
{
float32x4_t _rlow = vld1q_f32(ptr0);
float32x4_t _rhigh = vld1q_f32(ptr0 + 4);
float32x4_t _glow = vld1q_f32(ptr1);
float32x4_t _ghigh = vld1q_f32(ptr1 + 4);
float32x4_t _blow = vld1q_f32(ptr2);
float32x4_t _bhigh = vld1q_f32(ptr2 + 4);
int16x8_t _r16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_rlow)), vmovn_s32(vcvtq_s32_f32(_rhigh)));
int16x8_t _g16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_glow)), vmovn_s32(vcvtq_s32_f32(_ghigh)));
int16x8_t _b16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_blow)), vmovn_s32(vcvtq_s32_f32(_bhigh)));
uint8x8x3_t _rgb;
_rgb.val[0] = vqmovun_s16(_r16);
_rgb.val[1] = vqmovun_s16(_g16);
_rgb.val[2] = vqmovun_s16(_b16);
vst3_u8(rgb, _rgb);
rgb += 3 * 8;
ptr0 += 8;
ptr1 += 8;
ptr2 += 8;
}
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
rgb[0] = SATURATE_CAST_UCHAR(*ptr0);
rgb[1] = SATURATE_CAST_UCHAR(*ptr1);
rgb[2] = SATURATE_CAST_UCHAR(*ptr2);
rgb += 3;
ptr0++;
ptr1++;
ptr2++;
}
#undef SATURATE_CAST_UCHAR
rgb += wgap;
}
}
static int from_gray(const unsigned char* gray, int w, int h, int stride, Mat& m, Allocator* allocator)
{
m.create(w, h, 1, 4u, allocator);
if (m.empty())
return -100;
const int wgap = stride - w;
if (wgap == 0)
{
w = w * h;
h = 1;
}
float* ptr = m;
for (int y = 0; y < h; y++)
{
#if __ARM_NEON
int nn = w >> 4;
int remain = w - (nn << 4);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
#if !NCNN_GNU_INLINE_ASM || __aarch64__
for (; nn > 0; nn--)
{
uint8x16_t _gray = vld1q_u8(gray);
uint16x8_t _gray16_0 = vmovl_u8(vget_low_u8(_gray));
uint16x8_t _gray16_1 = vmovl_u8(vget_high_u8(_gray));
float32x4_t _graylow_0 = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_gray16_0)));
float32x4_t _grayhigh_0 = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_gray16_0)));
float32x4_t _graylow_1 = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_gray16_1)));
float32x4_t _grayhigh_1 = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_gray16_1)));
vst1q_f32(ptr, _graylow_0);
vst1q_f32(ptr + 4, _grayhigh_0);
vst1q_f32(ptr + 8, _graylow_1);
vst1q_f32(ptr + 12, _grayhigh_1);
gray += 16;
ptr += 16;
}
#else
if (nn > 0)
{
asm volatile(
"0: \n"
"pld [%1, #128] \n"
"vld1.u8 {d0,d1}, [%1]! \n"
"vmovl.u8 q8, d0 \n"
"vmovl.u8 q9, d1 \n"
"vmovl.u16 q0, d16 \n"
"vmovl.u16 q1, d17 \n"
"vmovl.u16 q2, d18 \n"
"vmovl.u16 q3, d19 \n"
"vcvt.f32.u32 q0, q0 \n"
"vcvt.f32.u32 q1, q1 \n"
"vcvt.f32.u32 q2, q2 \n"
"vcvt.f32.u32 q3, q3 \n"
"subs %0, #1 \n"
"vst1.f32 {d0-d3}, [%2]! \n"
"vst1.f32 {d4-d7}, [%2]! \n"
"bne 0b \n"
: "=r"(nn), // %0
"=r"(gray), // %1
"=r"(ptr) // %2
: "0"(nn),
"1"(gray),
"2"(ptr)
: "cc", "memory", "q0", "q1", "q2", "q3", "q8", "q9");
}
#endif // __aarch64__
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
*ptr = *gray;
gray++;
ptr++;
}
gray += wgap;
}
return 0;
}
static void to_gray(const Mat& m, unsigned char* gray, int stride)
{
int w = m.w;
int h = m.h;
const int wgap = stride - w;
if (wgap == 0)
{
w = w * h;
h = 1;
}
const float* ptr = m;
for (int y = 0; y < h; y++)
{
#define SATURATE_CAST_UCHAR(X) (unsigned char)::std::min(::std::max((int)(X), 0), 255);
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
for (; nn > 0; nn--)
{
float32x4_t _glow = vld1q_f32(ptr);
float32x4_t _ghigh = vld1q_f32(ptr + 4);
int16x8_t _g16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_glow)), vmovn_s32(vcvtq_s32_f32(_ghigh)));
uint8x8_t _gray = vqmovun_s16(_g16);
vst1_u8(gray, _gray);
gray += 8;
ptr += 8;
}
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
*gray = SATURATE_CAST_UCHAR(*ptr);
gray++;
ptr++;
}
#undef SATURATE_CAST_UCHAR
gray += wgap;
}
}
static int from_rgba(const unsigned char* rgba, int w, int h, int stride, Mat& m, Allocator* allocator)
{
m.create(w, h, 4, 4u, allocator);
if (m.empty())
return -100;
const int wgap = stride - w * 4;
if (wgap == 0)
{
w = w * h;
h = 1;
}
float* ptr0 = m.channel(0);
float* ptr1 = m.channel(1);
float* ptr2 = m.channel(2);
float* ptr3 = m.channel(3);
for (int y = 0; y < h; y++)
{
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
#if !NCNN_GNU_INLINE_ASM || __aarch64__
for (; nn > 0; nn--)
{
uint8x8x4_t _rgba = vld4_u8(rgba);
int16x8_t _r16 = vreinterpretq_s16_u16(vmovl_u8(_rgba.val[0]));
int16x8_t _g16 = vreinterpretq_s16_u16(vmovl_u8(_rgba.val[1]));
int16x8_t _b16 = vreinterpretq_s16_u16(vmovl_u8(_rgba.val[2]));
int16x8_t _a16 = vreinterpretq_s16_u16(vmovl_u8(_rgba.val[3]));
float32x4_t _rlow = vcvtq_f32_s32(vmovl_s16(vget_low_s16(_r16)));
float32x4_t _rhigh = vcvtq_f32_s32(vmovl_s16(vget_high_s16(_r16)));
float32x4_t _glow = vcvtq_f32_s32(vmovl_s16(vget_low_s16(_g16)));
float32x4_t _ghigh = vcvtq_f32_s32(vmovl_s16(vget_high_s16(_g16)));
float32x4_t _blow = vcvtq_f32_s32(vmovl_s16(vget_low_s16(_b16)));
float32x4_t _bhigh = vcvtq_f32_s32(vmovl_s16(vget_high_s16(_b16)));
float32x4_t _alow = vcvtq_f32_s32(vmovl_s16(vget_low_s16(_a16)));
float32x4_t _ahigh = vcvtq_f32_s32(vmovl_s16(vget_high_s16(_a16)));
vst1q_f32(ptr0, _rlow);
vst1q_f32(ptr0 + 4, _rhigh);
vst1q_f32(ptr1, _glow);
vst1q_f32(ptr1 + 4, _ghigh);
vst1q_f32(ptr2, _blow);
vst1q_f32(ptr2 + 4, _bhigh);
vst1q_f32(ptr3, _alow);
vst1q_f32(ptr3 + 4, _ahigh);
rgba += 4 * 8;
ptr0 += 8;
ptr1 += 8;
ptr2 += 8;
ptr3 += 8;
}
#else
if (nn > 0)
{
asm volatile(
"0: \n"
"pld [%1, #256] \n"
"vld4.u8 {d0-d3}, [%1]! \n"
"vmovl.u8 q8, d0 \n"
"vmovl.u8 q9, d1 \n"
"vmovl.u8 q10, d2 \n"
"vmovl.u8 q11, d3 \n"
"vmovl.u16 q0, d16 \n"
"vmovl.u16 q1, d17 \n"
"vmovl.u16 q2, d18 \n"
"vmovl.u16 q3, d19 \n"
"vmovl.u16 q8, d20 \n"
"vmovl.u16 q9, d21 \n"
"vmovl.u16 q10, d22 \n"
"vmovl.u16 q11, d23 \n"
"vcvt.f32.u32 q0, q0 \n"
"vcvt.f32.u32 q1, q1 \n"
"vcvt.f32.u32 q2, q2 \n"
"vcvt.f32.u32 q3, q3 \n"
"vcvt.f32.u32 q8, q8 \n"
"vcvt.f32.u32 q9, q9 \n"
"subs %0, #1 \n"
"vst1.f32 {d0-d3}, [%2]! \n"
"vcvt.f32.u32 q10, q10 \n"
"vcvt.f32.u32 q11, q11 \n"
"vst1.f32 {d4-d7}, [%3]! \n"
"vst1.f32 {d16-d19}, [%4]! \n"
"vst1.f32 {d20-d23}, [%5]! \n"
"bne 0b \n"
: "=r"(nn), // %0
"=r"(rgba), // %1
"=r"(ptr0), // %2
"=r"(ptr1), // %3
"=r"(ptr2), // %4
"=r"(ptr3) // %5
: "0"(nn),
"1"(rgba),
"2"(ptr0),
"3"(ptr1),
"4"(ptr2),
"5"(ptr3)
: "cc", "memory", "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11");
}
#endif // __aarch64__
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
*ptr0 = rgba[0];
*ptr1 = rgba[1];
*ptr2 = rgba[2];
*ptr3 = rgba[3];
rgba += 4;
ptr0++;
ptr1++;
ptr2++;
ptr3++;
}
rgba += wgap;
}
return 0;
}
static void to_rgba(const Mat& m, unsigned char* rgba, int stride)
{
int w = m.w;
int h = m.h;
const int wgap = stride - w * 4;
if (wgap == 0)
{
w = w * h;
h = 1;
}
const float* ptr0 = m.channel(0);
const float* ptr1 = m.channel(1);
const float* ptr2 = m.channel(2);
const float* ptr3 = m.channel(3);
for (int y = 0; y < h; y++)
{
#define SATURATE_CAST_UCHAR(X) (unsigned char)::std::min(::std::max((int)(X), 0), 255);
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
for (; nn > 0; nn--)
{
float32x4_t _rlow = vld1q_f32(ptr0);
float32x4_t _rhigh = vld1q_f32(ptr0 + 4);
float32x4_t _glow = vld1q_f32(ptr1);
float32x4_t _ghigh = vld1q_f32(ptr1 + 4);
float32x4_t _blow = vld1q_f32(ptr2);
float32x4_t _bhigh = vld1q_f32(ptr2 + 4);
float32x4_t _alow = vld1q_f32(ptr3);
float32x4_t _ahigh = vld1q_f32(ptr3 + 4);
int16x8_t _r16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_rlow)), vmovn_s32(vcvtq_s32_f32(_rhigh)));
int16x8_t _g16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_glow)), vmovn_s32(vcvtq_s32_f32(_ghigh)));
int16x8_t _b16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_blow)), vmovn_s32(vcvtq_s32_f32(_bhigh)));
int16x8_t _a16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_alow)), vmovn_s32(vcvtq_s32_f32(_ahigh)));
uint8x8x4_t _rgba;
_rgba.val[0] = vqmovun_s16(_r16);
_rgba.val[1] = vqmovun_s16(_g16);
_rgba.val[2] = vqmovun_s16(_b16);
_rgba.val[3] = vqmovun_s16(_a16);
vst4_u8(rgba, _rgba);
rgba += 4 * 8;
ptr0 += 8;
ptr1 += 8;
ptr2 += 8;
ptr3 += 8;
}
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
rgba[0] = SATURATE_CAST_UCHAR(*ptr0);
rgba[1] = SATURATE_CAST_UCHAR(*ptr1);
rgba[2] = SATURATE_CAST_UCHAR(*ptr2);
rgba[3] = SATURATE_CAST_UCHAR(*ptr3);
rgba += 4;
ptr0++;
ptr1++;
ptr2++;
ptr3++;
}
#undef SATURATE_CAST_UCHAR
rgba += wgap;
}
}
static int from_rgb2bgr(const unsigned char* rgb, int w, int h, int stride, Mat& m, Allocator* allocator)
{
m.create(w, h, 3, 4u, allocator);
if (m.empty())
return -100;
const int wgap = stride - w * 3;
if (wgap == 0)
{
w = w * h;
h = 1;
}
float* ptr0 = m.channel(0);
float* ptr1 = m.channel(1);
float* ptr2 = m.channel(2);
for (int y = 0; y < h; y++)
{
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
#if !NCNN_GNU_INLINE_ASM || __aarch64__
for (; nn > 0; nn--)
{
uint8x8x3_t _rgb = vld3_u8(rgb);
uint16x8_t _r16 = vmovl_u8(_rgb.val[0]);
uint16x8_t _g16 = vmovl_u8(_rgb.val[1]);
uint16x8_t _b16 = vmovl_u8(_rgb.val[2]);
float32x4_t _rlow = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_r16)));
float32x4_t _rhigh = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_r16)));
float32x4_t _glow = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_g16)));
float32x4_t _ghigh = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_g16)));
float32x4_t _blow = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_b16)));
float32x4_t _bhigh = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_b16)));
vst1q_f32(ptr2, _rlow);
vst1q_f32(ptr2 + 4, _rhigh);
vst1q_f32(ptr1, _glow);
vst1q_f32(ptr1 + 4, _ghigh);
vst1q_f32(ptr0, _blow);
vst1q_f32(ptr0 + 4, _bhigh);
rgb += 3 * 8;
ptr0 += 8;
ptr1 += 8;
ptr2 += 8;
}
#else
if (nn > 0)
{
asm volatile(
"0: \n"
"pld [%1, #256] \n"
"vld3.u8 {d0-d2}, [%1]! \n"
"vmovl.u8 q8, d0 \n"
"vmovl.u8 q9, d1 \n"
"vmovl.u8 q10, d2 \n"
"vmovl.u16 q0, d16 \n"
"vmovl.u16 q1, d17 \n"
"vmovl.u16 q2, d18 \n"
"vmovl.u16 q3, d19 \n"
"vmovl.u16 q8, d20 \n"
"vmovl.u16 q9, d21 \n"
"vcvt.f32.u32 q0, q0 \n"
"vcvt.f32.u32 q1, q1 \n"
"vcvt.f32.u32 q2, q2 \n"
"vcvt.f32.u32 q3, q3 \n"
"vcvt.f32.u32 q8, q8 \n"
"subs %0, #1 \n"
"vst1.f32 {d0-d3}, [%4]! \n"
"vcvt.f32.u32 q9, q9 \n"
"vst1.f32 {d4-d7}, [%3]! \n"
"vst1.f32 {d16-d19}, [%2]! \n"
"bne 0b \n"
: "=r"(nn), // %0
"=r"(rgb), // %1
"=r"(ptr0), // %2
"=r"(ptr1), // %3
"=r"(ptr2) // %4
: "0"(nn),
"1"(rgb),
"2"(ptr0),
"3"(ptr1),
"4"(ptr2)
: "cc", "memory", "q0", "q1", "q2", "q3", "q8", "q9", "q10");
}
#endif // __aarch64__
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
*ptr0 = rgb[2];
*ptr1 = rgb[1];
*ptr2 = rgb[0];
rgb += 3;
ptr0++;
ptr1++;
ptr2++;
}
rgb += wgap;
}
return 0;
}
static void to_bgr2rgb(const Mat& m, unsigned char* rgb, int stride)
{
int w = m.w;
int h = m.h;
const int wgap = stride - w * 3;
if (wgap == 0)
{
w = w * h;
h = 1;
}
const float* ptr0 = m.channel(0);
const float* ptr1 = m.channel(1);
const float* ptr2 = m.channel(2);
for (int y = 0; y < h; y++)
{
#define SATURATE_CAST_UCHAR(X) (unsigned char)::std::min(::std::max((int)(X), 0), 255);
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
for (; nn > 0; nn--)
{
float32x4_t _rlow = vld1q_f32(ptr2);
float32x4_t _rhigh = vld1q_f32(ptr2 + 4);
float32x4_t _glow = vld1q_f32(ptr1);
float32x4_t _ghigh = vld1q_f32(ptr1 + 4);
float32x4_t _blow = vld1q_f32(ptr0);
float32x4_t _bhigh = vld1q_f32(ptr0 + 4);
int16x8_t _r16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_rlow)), vmovn_s32(vcvtq_s32_f32(_rhigh)));
int16x8_t _g16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_glow)), vmovn_s32(vcvtq_s32_f32(_ghigh)));
int16x8_t _b16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_blow)), vmovn_s32(vcvtq_s32_f32(_bhigh)));
uint8x8x3_t _rgb;
_rgb.val[0] = vqmovun_s16(_r16);
_rgb.val[1] = vqmovun_s16(_g16);
_rgb.val[2] = vqmovun_s16(_b16);
vst3_u8(rgb, _rgb);
rgb += 3 * 8;
ptr0 += 8;
ptr1 += 8;
ptr2 += 8;
}
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
rgb[2] = SATURATE_CAST_UCHAR(*ptr0);
rgb[1] = SATURATE_CAST_UCHAR(*ptr1);
rgb[0] = SATURATE_CAST_UCHAR(*ptr2);
rgb += 3;
ptr0++;
ptr1++;
ptr2++;
}
#undef SATURATE_CAST_UCHAR
rgb += wgap;
}
}
static int from_rgb2gray(const unsigned char* rgb, int w, int h, int stride, Mat& m, Allocator* allocator)
{
// coeffs for r g b = 0.299f, 0.587f, 0.114f
const unsigned char Y_shift = 8; //14
const unsigned char R2Y = 77;
const unsigned char G2Y = 150;
const unsigned char B2Y = 29;
m.create(w, h, 1, 4u, allocator);
if (m.empty())
return -100;
const int wgap = stride - w * 3;
if (wgap == 0)
{
w = w * h;
h = 1;
}
float* ptr = m;
for (int y = 0; y < h; y++)
{
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
#if !NCNN_GNU_INLINE_ASM || __aarch64__
uint8x8_t _R2Y = vdup_n_u8(R2Y);
uint8x8_t _G2Y = vdup_n_u8(G2Y);
uint8x8_t _B2Y = vdup_n_u8(B2Y);
for (; nn > 0; nn--)
{
uint8x8x3_t _rgb = vld3_u8(rgb);
uint16x8_t _y16 = vmull_u8(_rgb.val[0], _R2Y);
_y16 = vmlal_u8(_y16, _rgb.val[1], _G2Y);
_y16 = vmlal_u8(_y16, _rgb.val[2], _B2Y);
_y16 = vshrq_n_u16(_y16, Y_shift);
float32x4_t _ylow = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_y16)));
float32x4_t _yhigh = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_y16)));
vst1q_f32(ptr, _ylow);
vst1q_f32(ptr + 4, _yhigh);
rgb += 3 * 8;
ptr += 8;
}
#else
if (nn > 0)
{
asm volatile(
"vdup.u8 d16, %6 \n"
"vdup.u8 d17, %7 \n"
"vdup.u8 d18, %8 \n"
"0: \n"
"pld [%1, #256] \n"
"vld3.u8 {d0-d2}, [%1]! \n"
"vmull.u8 q2, d0, d16 \n"
"vmlal.u8 q2, d1, d17 \n"
"vmlal.u8 q2, d2, d18 \n"
"vshr.u16 q2, q2, #8 \n" // Y_shift
"vmovl.u16 q0, d4 \n"
"vmovl.u16 q1, d5 \n"
"vcvt.f32.u32 q0, q0 \n"
"vcvt.f32.u32 q1, q1 \n"
"subs %0, #1 \n"
"vst1.f32 {d0-d3}, [%2]! \n"
"bne 0b \n"
: "=r"(nn), // %0
"=r"(rgb), // %1
"=r"(ptr) // %2
: "0"(nn),
"1"(rgb),
"2"(ptr),
"r"(R2Y), // %6
"r"(G2Y), // %7
"r"(B2Y) // %8
: "cc", "memory", "q0", "q1", "q2", "q8", "q9");
}
#endif // __aarch64__
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
*ptr = static_cast<float>((rgb[0] * R2Y + rgb[1] * G2Y + rgb[2] * B2Y) >> Y_shift);
rgb += 3;
ptr++;
}
rgb += wgap;
}
return 0;
}
static int from_rgb2rgba(const unsigned char* rgb, int w, int h, int stride, Mat& m, Allocator* allocator)
{
m.create(w, h, 4, 4u, allocator);
if (m.empty())
return -100;
Mat rgb_channels = m.channel_range(0, 3);
from_rgb(rgb, w, h, stride, rgb_channels, allocator);
Mat alpha_channel = m.channel(3);
alpha_channel.fill(255.f);
return 0;
}
static void to_rgb2rgba(const Mat& m, unsigned char* rgba, int stride)
{
int w = m.w;
int h = m.h;
const int wgap = stride - w * 4;
if (wgap == 0)
{
w = w * h;
h = 1;
}
const float* ptr0 = m.channel(0);
const float* ptr1 = m.channel(1);
const float* ptr2 = m.channel(2);
for (int y = 0; y < h; y++)
{
#define SATURATE_CAST_UCHAR(X) (unsigned char)::std::min(::std::max((int)(X), 0), 255);
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
uint8x8_t _a = vdup_n_u8(255);
for (; nn > 0; nn--)
{
float32x4_t _rlow = vld1q_f32(ptr0);
float32x4_t _rhigh = vld1q_f32(ptr0 + 4);
float32x4_t _glow = vld1q_f32(ptr1);
float32x4_t _ghigh = vld1q_f32(ptr1 + 4);
float32x4_t _blow = vld1q_f32(ptr2);
float32x4_t _bhigh = vld1q_f32(ptr2 + 4);
int16x8_t _r16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_rlow)), vmovn_s32(vcvtq_s32_f32(_rhigh)));
int16x8_t _g16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_glow)), vmovn_s32(vcvtq_s32_f32(_ghigh)));
int16x8_t _b16 = vcombine_s16(vmovn_s32(vcvtq_s32_f32(_blow)), vmovn_s32(vcvtq_s32_f32(_bhigh)));
uint8x8x4_t _rgba;
_rgba.val[0] = vqmovun_s16(_r16);
_rgba.val[1] = vqmovun_s16(_g16);
_rgba.val[2] = vqmovun_s16(_b16);
_rgba.val[3] = _a;
vst4_u8(rgba, _rgba);
rgba += 4 * 8;
ptr0 += 8;
ptr1 += 8;
ptr2 += 8;
}
#endif // __ARM_NEON
for (; remain > 0; remain--)
{
rgba[0] = SATURATE_CAST_UCHAR(*ptr0);
rgba[1] = SATURATE_CAST_UCHAR(*ptr1);
rgba[2] = SATURATE_CAST_UCHAR(*ptr2);
rgba[3] = 255;
rgba += 4;
ptr0++;
ptr1++;
ptr2++;
}
#undef SATURATE_CAST_UCHAR
rgba += wgap;
}
}
static int from_bgr2gray(const unsigned char* bgr, int w, int h, int stride, Mat& m, Allocator* allocator)
{
// coeffs for r g b = 0.299f, 0.587f, 0.114f
const unsigned char Y_shift = 8; //14
const unsigned char R2Y = 77;
const unsigned char G2Y = 150;
const unsigned char B2Y = 29;
m.create(w, h, 1, 4u, allocator);
if (m.empty())
return -100;
const int wgap = stride - w * 3;
if (wgap == 0)
{
w = w * h;
h = 1;
}
float* ptr = m;
for (int y = 0; y < h; y++)
{
#if __ARM_NEON
int nn = w >> 3;
int remain = w - (nn << 3);
#else
int remain = w;
#endif // __ARM_NEON
#if __ARM_NEON
#if !NCNN_GNU_INLINE_ASM || __aarch64__
uint8x8_t _R2Y = vdup_n_u8(R2Y);
uint8x8_t _G2Y = vdup_n_u8(G2Y);
uint8x8_t _B2Y = vdup_n_u8(B2Y);
for (; nn > 0; nn--)
{
uint8x8x3_t _rgb = vld3_u8(bgr);
uint16x8_t _y16 = vmull_u8(_rgb.val[2], _R2Y);
_y16 = vmlal_u8(_y16, _rgb.val[1], _G2Y);
_y16 = vmlal_u8(_y16, _rgb.val[0], _B2Y);
_y16 = vshrq_n_u16(_y16, Y_shift);
float32x4_t _ylow = vcvtq_f32_u32(vmovl_u16(vget_low_u16(_y16)));
float32x4_t _yhigh = vcvtq_f32_u32(vmovl_u16(vget_high_u16(_y16)));
vst1q_f32(ptr, _ylow);
vst1q_f32(ptr + 4, _yhigh);
bgr += 3 * 8;
ptr += 8;
}
#else
if (nn > 0)
{
asm volatile(
"vdup.u8 d16, %6 \n"
"vdup.u8 d17, %7 \n"
"vdup.u8 d18, %8 \n"
"0: \n"
"pld [%1, #256] \n"
"vld3.u8 {d0-d2}, [%1]! \n"