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opencv-mobile/patches/draw_text.h

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//
// Copyright (C) 2023 nihui
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// 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 <ctype.h>
#include <limits.h>
#include <math.h>
#include <algorithm>
#if __ARM_NEON
#include <arm_neon.h>
#endif // __ARM_NEON
#if __SSE2__
#include <emmintrin.h>
#endif
#include "mono_font_data.h"
namespace cv
{
static void get_text_drawing_size(const char* text, int fontpixelsize, int* w, int* h)
{
*w = 0;
*h = 0;
const int n = strlen(text);
int line_w = 0;
for (int i = 0; i < n; i++)
{
char ch = text[i];
if (ch == '\n')
{
// newline
*w = std::max(*w, line_w);
*h += fontpixelsize * 2;
line_w = 0;
}
if (isprint(ch) != 0)
{
line_w += fontpixelsize;
}
}
*w = std::max(*w, line_w);
*h += fontpixelsize * 2;
}
static void resize_bilinear_font(const unsigned char* font_bitmap, unsigned char* resized_font_bitmap, int fontpixelsize)
{
const int INTER_RESIZE_COEF_BITS = 11;
const int INTER_RESIZE_COEF_SCALE = 1 << INTER_RESIZE_COEF_BITS;
const int srcw = 20;
const int srch = 40;
const int w = fontpixelsize;
const int h = fontpixelsize * 2;
double scale = (double)srcw / w;
int* buf = new int[w + h + w + h];
int* xofs = buf; //new int[w];
int* yofs = buf + w; //new int[h];
short* ialpha = (short*)(buf + w + h); //new short[w * 2];
short* ibeta = (short*)(buf + w + h + w); //new short[h * 2];
float fx;
float fy;
int sx;
int sy;
#define SATURATE_CAST_SHORT(X) (short)::std::min(::std::max((int)(X + (X >= 0.f ? 0.5f : -0.5f)), SHRT_MIN), SHRT_MAX);
for (int dx = 0; dx < w; dx++)
{
fx = (float)((dx + 0.5) * scale - 0.5);
sx = static_cast<int>(floor(fx));
fx -= sx;
xofs[dx] = sx;
float a0 = (1.f - fx) * INTER_RESIZE_COEF_SCALE;
float a1 = fx * INTER_RESIZE_COEF_SCALE;
ialpha[dx * 2] = SATURATE_CAST_SHORT(a0);
ialpha[dx * 2 + 1] = SATURATE_CAST_SHORT(a1);
}
for (int dy = 0; dy < h; dy++)
{
fy = (float)((dy + 0.5) * scale - 0.5);
sy = static_cast<int>(floor(fy));
fy -= sy;
yofs[dy] = sy;
float b0 = (1.f - fy) * INTER_RESIZE_COEF_SCALE;
float b1 = fy * INTER_RESIZE_COEF_SCALE;
ibeta[dy * 2] = SATURATE_CAST_SHORT(b0);
ibeta[dy * 2 + 1] = SATURATE_CAST_SHORT(b1);
}
#undef SATURATE_CAST_SHORT
// loop body
std::vector<short> rowsbuf0(w);
std::vector<short> rowsbuf1(w);
short* rows0 = (short*)rowsbuf0.data();
short* rows1 = (short*)rowsbuf1.data();
{
short* rows1p = rows1;
for (int dx = 0; dx < w; dx++)
{
rows1p[dx] = 0;
}
}
int prev_sy1 = -2;
for (int dy = 0; dy < h; dy++)
{
sy = yofs[dy];
if (sy == prev_sy1)
{
// reuse all rows
}
else if (sy == prev_sy1 + 1)
{
// hresize one row
short* rows0_old = rows0;
rows0 = rows1;
rows1 = rows0_old;
const unsigned char* S1 = font_bitmap + 10 * (sy + 1);
if (sy >= srch - 1)
{
short* rows1p = rows1;
for (int dx = 0; dx < w; dx++)
{
rows1p[dx] = 0;
}
}
else
{
const short* ialphap = ialpha;
short* rows1p = rows1;
for (int dx = 0; dx < w; dx++)
{
sx = xofs[dx];
short a0 = ialphap[0];
short a1 = ialphap[1];
unsigned char S1p0;
unsigned char S1p1;
if (sx < 0)
{
S1p0 = 0;
S1p1 = S1[0] & 0x0f;
}
else if (sx >= srcw - 1)
{
S1p0 = (S1[9] & 0xf0) >> 4;
S1p1 = 0;
}
else
{
S1p0 = sx % 2 == 0 ? S1[sx / 2] & 0x0f : (S1[sx / 2] & 0xf0) >> 4;
S1p1 = sx % 2 == 0 ? (S1[sx / 2] & 0xf0) >> 4 : S1[sx / 2 + 1] & 0x0f;
}
rows1p[dx] = (S1p0 * a0 + S1p1 * a1) * 17 >> 4;
ialphap += 2;
}
}
}
else
{
// hresize two rows
const unsigned char* S0 = font_bitmap + 10 * (sy);
const unsigned char* S1 = font_bitmap + 10 * (sy + 1);
if (sy >= srch - 1)
{
const short* ialphap = ialpha;
short* rows0p = rows0;
short* rows1p = rows1;
for (int dx = 0; dx < w; dx++)
{
sx = xofs[dx];
short a0 = ialphap[0];
short a1 = ialphap[1];
unsigned char S0p0;
unsigned char S0p1;
if (sx < 0)
{
S0p0 = 0;
S0p1 = S0[0] & 0x0f;
}
else if (sx >= srcw - 1)
{
S0p0 = (S0[9] & 0xf0) >> 4;
S0p1 = 0;
}
else
{
S0p0 = sx % 2 == 0 ? S0[sx / 2] & 0x0f : (S0[sx / 2] & 0xf0) >> 4;
S0p1 = sx % 2 == 0 ? (S0[sx / 2] & 0xf0) >> 4 : S0[sx / 2 + 1] & 0x0f;
}
rows0p[dx] = (S0p0 * a0 + S0p1 * a1) * 17 >> 4;
rows1p[dx] = 0;
ialphap += 2;
}
}
else
{
const short* ialphap = ialpha;
short* rows0p = rows0;
short* rows1p = rows1;
for (int dx = 0; dx < w; dx++)
{
sx = xofs[dx];
short a0 = ialphap[0];
short a1 = ialphap[1];
unsigned char S0p0;
unsigned char S0p1;
unsigned char S1p0;
unsigned char S1p1;
if (sx < 0)
{
S0p0 = 0;
S0p1 = S0[0] & 0x0f;
S1p0 = 0;
S1p1 = S1[0] & 0x0f;
}
else if (sx >= srcw - 1)
{
S0p0 = (S0[9] & 0xf0) >> 4;
S0p1 = 0;
S1p0 = (S1[9] & 0xf0) >> 4;
S1p1 = 0;
}
else
{
S0p0 = sx % 2 == 0 ? S0[sx / 2] & 0x0f : (S0[sx / 2] & 0xf0) >> 4;
S0p1 = sx % 2 == 0 ? (S0[sx / 2] & 0xf0) >> 4 : S0[sx / 2 + 1] & 0x0f;
S1p0 = sx % 2 == 0 ? S1[sx / 2] & 0x0f : (S1[sx / 2] & 0xf0) >> 4;
S1p1 = sx % 2 == 0 ? (S1[sx / 2] & 0xf0) >> 4 : S1[sx / 2 + 1] & 0x0f;
}
rows0p[dx] = (S0p0 * a0 + S0p1 * a1) * 17 >> 4;
rows1p[dx] = (S1p0 * a0 + S1p1 * a1) * 17 >> 4;
ialphap += 2;
}
}
}
prev_sy1 = sy;
if (dy + 1 < h && yofs[dy + 1] == sy)
{
// vresize for two rows
short b0 = ibeta[0];
short b1 = ibeta[1];
short b2 = ibeta[2];
short b3 = ibeta[3];
short* rows0p = rows0;
short* rows1p = rows1;
unsigned char* Dp0 = resized_font_bitmap + w * (dy);
unsigned char* Dp1 = resized_font_bitmap + w * (dy + 1);
int dx = 0;
#if __ARM_NEON
int16x8_t _b0 = vdupq_n_s16(b0);
int16x8_t _b1 = vdupq_n_s16(b1);
int16x8_t _b2 = vdupq_n_s16(b2);
int16x8_t _b3 = vdupq_n_s16(b3);
for (; dx + 15 < w; dx += 16)
{
int16x8_t _r00 = vld1q_s16(rows0p);
int16x8_t _r01 = vld1q_s16(rows0p + 8);
int16x8_t _r10 = vld1q_s16(rows1p);
int16x8_t _r11 = vld1q_s16(rows1p + 8);
int16x8_t _acc00 = vaddq_s16(vqdmulhq_s16(_r00, _b0), vqdmulhq_s16(_r10, _b1));
int16x8_t _acc01 = vaddq_s16(vqdmulhq_s16(_r01, _b0), vqdmulhq_s16(_r11, _b1));
int16x8_t _acc10 = vaddq_s16(vqdmulhq_s16(_r00, _b2), vqdmulhq_s16(_r10, _b3));
int16x8_t _acc11 = vaddq_s16(vqdmulhq_s16(_r01, _b2), vqdmulhq_s16(_r11, _b3));
uint8x16_t _Dp0 = vcombine_u8(vqrshrun_n_s16(_acc00, 3), vqrshrun_n_s16(_acc01, 3));
uint8x16_t _Dp1 = vcombine_u8(vqrshrun_n_s16(_acc10, 3), vqrshrun_n_s16(_acc11, 3));
vst1q_u8(Dp0, _Dp0);
vst1q_u8(Dp1, _Dp1);
Dp0 += 16;
Dp1 += 16;
rows0p += 16;
rows1p += 16;
}
for (; dx + 7 < w; dx += 8)
{
int16x8_t _r0 = vld1q_s16(rows0p);
int16x8_t _r1 = vld1q_s16(rows1p);
int16x8_t _acc0 = vaddq_s16(vqdmulhq_s16(_r0, _b0), vqdmulhq_s16(_r1, _b1));
int16x8_t _acc1 = vaddq_s16(vqdmulhq_s16(_r0, _b2), vqdmulhq_s16(_r1, _b3));
uint8x8_t _Dp0 = vqrshrun_n_s16(_acc0, 3);
uint8x8_t _Dp1 = vqrshrun_n_s16(_acc1, 3);
vst1_u8(Dp0, _Dp0);
vst1_u8(Dp1, _Dp1);
Dp0 += 8;
Dp1 += 8;
rows0p += 8;
rows1p += 8;
}
#endif // __ARM_NEON
#if __SSE2__
__m128i _b0 = _mm_set1_epi16(b0);
__m128i _b1 = _mm_set1_epi16(b1);
__m128i _b2 = _mm_set1_epi16(b2);
__m128i _b3 = _mm_set1_epi16(b3);
__m128i _v2 = _mm_set1_epi16(2);
for (; dx + 15 < w; dx += 16)
{
__m128i _r00 = _mm_loadu_si128((const __m128i*)rows0p);
__m128i _r01 = _mm_loadu_si128((const __m128i*)(rows0p + 8));
__m128i _r10 = _mm_loadu_si128((const __m128i*)rows1p);
__m128i _r11 = _mm_loadu_si128((const __m128i*)(rows1p + 8));
__m128i _acc00 = _mm_add_epi16(_mm_mulhi_epi16(_r00, _b0), _mm_mulhi_epi16(_r10, _b1));
__m128i _acc01 = _mm_add_epi16(_mm_mulhi_epi16(_r01, _b0), _mm_mulhi_epi16(_r11, _b1));
__m128i _acc10 = _mm_add_epi16(_mm_mulhi_epi16(_r00, _b2), _mm_mulhi_epi16(_r10, _b3));
__m128i _acc11 = _mm_add_epi16(_mm_mulhi_epi16(_r01, _b2), _mm_mulhi_epi16(_r11, _b3));
_acc00 = _mm_srai_epi16(_mm_add_epi16(_acc00, _v2), 2);
_acc01 = _mm_srai_epi16(_mm_add_epi16(_acc01, _v2), 2);
_acc10 = _mm_srai_epi16(_mm_add_epi16(_acc10, _v2), 2);
_acc11 = _mm_srai_epi16(_mm_add_epi16(_acc11, _v2), 2);
__m128i _Dp0 = _mm_packus_epi16(_acc00, _acc01);
__m128i _Dp1 = _mm_packus_epi16(_acc10, _acc11);
_mm_storeu_si128((__m128i*)Dp0, _Dp0);
_mm_storeu_si128((__m128i*)Dp1, _Dp1);
Dp0 += 16;
Dp1 += 16;
rows0p += 16;
rows1p += 16;
}
for (; dx + 7 < w; dx += 8)
{
__m128i _r0 = _mm_loadu_si128((const __m128i*)rows0p);
__m128i _r1 = _mm_loadu_si128((const __m128i*)rows1p);
__m128i _acc0 = _mm_add_epi16(_mm_mulhi_epi16(_r0, _b0), _mm_mulhi_epi16(_r1, _b1));
__m128i _acc1 = _mm_add_epi16(_mm_mulhi_epi16(_r0, _b2), _mm_mulhi_epi16(_r1, _b3));
_acc0 = _mm_srai_epi16(_mm_add_epi16(_acc0, _v2), 2);
_acc1 = _mm_srai_epi16(_mm_add_epi16(_acc1, _v2), 2);
__m128i _Dp0 = _mm_packus_epi16(_acc0, _acc0);
__m128i _Dp1 = _mm_packus_epi16(_acc1, _acc1);
_mm_storel_epi64((__m128i*)Dp0, _Dp0);
_mm_storel_epi64((__m128i*)Dp1, _Dp1);
Dp0 += 8;
Dp1 += 8;
rows0p += 8;
rows1p += 8;
}
#endif // __SSE2__
for (; dx < w; dx++)
{
short s0 = *rows0p++;
short s1 = *rows1p++;
*Dp0++ = (unsigned char)(((short)((b0 * s0) >> 16) + (short)((b1 * s1) >> 16) + 2) >> 2);
*Dp1++ = (unsigned char)(((short)((b2 * s0) >> 16) + (short)((b3 * s1) >> 16) + 2) >> 2);
}
ibeta += 4;
dy += 1;
}
else
{
// vresize
short b0 = ibeta[0];
short b1 = ibeta[1];
short* rows0p = rows0;
short* rows1p = rows1;
unsigned char* Dp = resized_font_bitmap + w * (dy);
int dx = 0;
#if __ARM_NEON
int16x8_t _b0 = vdupq_n_s16(b0);
int16x8_t _b1 = vdupq_n_s16(b1);
for (; dx + 15 < w; dx += 16)
{
int16x8_t _r00 = vld1q_s16(rows0p);
int16x8_t _r01 = vld1q_s16(rows0p + 8);
int16x8_t _r10 = vld1q_s16(rows1p);
int16x8_t _r11 = vld1q_s16(rows1p + 8);
int16x8_t _acc0 = vaddq_s16(vqdmulhq_s16(_r00, _b0), vqdmulhq_s16(_r10, _b1));
int16x8_t _acc1 = vaddq_s16(vqdmulhq_s16(_r01, _b0), vqdmulhq_s16(_r11, _b1));
uint8x16_t _Dp = vcombine_u8(vqrshrun_n_s16(_acc0, 3), vqrshrun_n_s16(_acc1, 3));
vst1q_u8(Dp, _Dp);
Dp += 16;
rows0p += 16;
rows1p += 16;
}
for (; dx + 7 < w; dx += 8)
{
int16x8_t _r0 = vld1q_s16(rows0p);
int16x8_t _r1 = vld1q_s16(rows1p);
int16x8_t _acc = vaddq_s16(vqdmulhq_s16(_r0, _b0), vqdmulhq_s16(_r1, _b1));
uint8x8_t _Dp = vqrshrun_n_s16(_acc, 3);
vst1_u8(Dp, _Dp);
Dp += 8;
rows0p += 8;
rows1p += 8;
}
#endif // __ARM_NEON
#if __SSE2__
__m128i _b0 = _mm_set1_epi16(b0);
__m128i _b1 = _mm_set1_epi16(b1);
__m128i _v2 = _mm_set1_epi16(2);
for (; dx + 15 < w; dx += 16)
{
__m128i _r00 = _mm_loadu_si128((const __m128i*)rows0p);
__m128i _r01 = _mm_loadu_si128((const __m128i*)(rows0p + 8));
__m128i _r10 = _mm_loadu_si128((const __m128i*)rows1p);
__m128i _r11 = _mm_loadu_si128((const __m128i*)(rows1p + 8));
__m128i _acc0 = _mm_add_epi16(_mm_mulhi_epi16(_r00, _b0), _mm_mulhi_epi16(_r10, _b1));
__m128i _acc1 = _mm_add_epi16(_mm_mulhi_epi16(_r01, _b0), _mm_mulhi_epi16(_r11, _b1));
_acc0 = _mm_srai_epi16(_mm_add_epi16(_acc0, _v2), 2);
_acc1 = _mm_srai_epi16(_mm_add_epi16(_acc1, _v2), 2);
__m128i _Dp = _mm_packus_epi16(_acc0, _acc1);
_mm_storeu_si128((__m128i*)Dp, _Dp);
Dp += 16;
rows0p += 16;
rows1p += 16;
}
for (; dx + 7 < w; dx += 8)
{
__m128i _r0 = _mm_loadu_si128((const __m128i*)rows0p);
__m128i _r1 = _mm_loadu_si128((const __m128i*)rows1p);
__m128i _acc = _mm_add_epi16(_mm_mulhi_epi16(_r0, _b0), _mm_mulhi_epi16(_r1, _b1));
_acc = _mm_srai_epi16(_mm_add_epi16(_acc, _v2), 2);
__m128i _Dp = _mm_packus_epi16(_acc, _acc);
_mm_storel_epi64((__m128i*)Dp, _Dp);
Dp += 8;
rows0p += 8;
rows1p += 8;
}
#endif // __SSE2__
for (; dx < w; dx++)
{
short s0 = *rows0p++;
short s1 = *rows1p++;
*Dp++ = (unsigned char)(((short)((b0 * s0) >> 16) + (short)((b1 * s1) >> 16) + 2) >> 2);
}
ibeta += 2;
}
}
delete[] buf;
}
static void draw_text_c1(unsigned char* pixels, int w, int h, int stride, const char* text, int x, int y, int fontpixelsize, unsigned int color)
{
const unsigned char* pen_color = (const unsigned char*)&color;
unsigned char* resized_font_bitmap = new unsigned char[fontpixelsize * fontpixelsize * 2];
const int n = strlen(text);
int cursor_x = x;
int cursor_y = y;
for (int i = 0; i < n; i++)
{
char ch = text[i];
if (ch == '\n')
{
// newline
cursor_x = x;
cursor_y += fontpixelsize * 2;
continue;
}
if (ch == ' ')
{
cursor_x += fontpixelsize;
continue;
}
if (isprint(ch) != 0)
{
const unsigned char* font_bitmap = mono_font_data[ch - '!'];
// draw resized character
resize_bilinear_font(font_bitmap, resized_font_bitmap, fontpixelsize);
const int ystart = std::max(cursor_y, 0);
const int yend = std::min(cursor_y + fontpixelsize * 2, h);
const int xstart = std::max(cursor_x, 0);
const int xend = std::min(cursor_x + fontpixelsize, w);
for (int j = ystart; j < yend; j++)
{
const unsigned char* palpha = resized_font_bitmap + (j - cursor_y) * fontpixelsize + xstart - cursor_x;
unsigned char* p = pixels + stride * j + xstart;
for (int k = xstart; k < xend; k++)
{
unsigned char alpha = *palpha++;
p[0] = (p[0] * (255 - alpha) + pen_color[0] * alpha) / 255;
p += 1;
}
}
cursor_x += fontpixelsize;
}
}
delete[] resized_font_bitmap;
}
static void draw_text_c3(unsigned char* pixels, int w, int h, int stride, const char* text, int x, int y, int fontpixelsize, unsigned int color)
{
const unsigned char* pen_color = (const unsigned char*)&color;
unsigned char* resized_font_bitmap = new unsigned char[fontpixelsize * fontpixelsize * 2];
const int n = strlen(text);
int cursor_x = x;
int cursor_y = y;
for (int i = 0; i < n; i++)
{
char ch = text[i];
if (ch == '\n')
{
// newline
cursor_x = x;
cursor_y += fontpixelsize * 2;
continue;
}
if (ch == ' ')
{
cursor_x += fontpixelsize;
continue;
}
if (isprint(ch) != 0)
{
const unsigned char* font_bitmap = mono_font_data[ch - '!'];
// draw resized character
resize_bilinear_font(font_bitmap, resized_font_bitmap, fontpixelsize);
const int ystart = std::max(cursor_y, 0);
const int yend = std::min(cursor_y + fontpixelsize * 2, h);
const int xstart = std::max(cursor_x, 0);
const int xend = std::min(cursor_x + fontpixelsize, w);
for (int j = ystart; j < yend; j++)
{
const unsigned char* palpha = resized_font_bitmap + (j - cursor_y) * fontpixelsize + xstart - cursor_x;
unsigned char* p = pixels + stride * j + xstart * 3;
for (int k = xstart; k < xend; k++)
{
unsigned char alpha = *palpha++;
p[0] = (p[0] * (255 - alpha) + pen_color[0] * alpha) / 255;
p[1] = (p[1] * (255 - alpha) + pen_color[1] * alpha) / 255;
p[2] = (p[2] * (255 - alpha) + pen_color[2] * alpha) / 255;
p += 3;
}
}
cursor_x += fontpixelsize;
}
}
delete[] resized_font_bitmap;
}
static void draw_text_c4(unsigned char* pixels, int w, int h, int stride, const char* text, int x, int y, int fontpixelsize, unsigned int color)
{
const unsigned char* pen_color = (const unsigned char*)&color;
unsigned char* resized_font_bitmap = new unsigned char[fontpixelsize * fontpixelsize * 2];
const int n = strlen(text);
int cursor_x = x;
int cursor_y = y;
for (int i = 0; i < n; i++)
{
char ch = text[i];
if (ch == '\n')
{
// newline
cursor_x = x;
cursor_y += fontpixelsize * 2;
continue;
}
if (ch == ' ')
{
cursor_x += fontpixelsize;
continue;
}
if (isprint(ch) != 0)
{
const unsigned char* font_bitmap = mono_font_data[ch - '!'];
// draw resized character
resize_bilinear_font(font_bitmap, resized_font_bitmap, fontpixelsize);
const int ystart = std::max(cursor_y, 0);
const int yend = std::min(cursor_y + fontpixelsize * 2, h);
const int xstart = std::max(cursor_x, 0);
const int xend = std::min(cursor_x + fontpixelsize, w);
for (int j = ystart; j < yend; j++)
{
const unsigned char* palpha = resized_font_bitmap + (j - cursor_y) * fontpixelsize + xstart - cursor_x;
unsigned char* p = pixels + stride * j + xstart * 4;
for (int k = xstart; k < xend; k++)
{
unsigned char alpha = *palpha++;
p[0] = (p[0] * (255 - alpha) + pen_color[0] * alpha) / 255;
p[1] = (p[1] * (255 - alpha) + pen_color[1] * alpha) / 255;
p[2] = (p[2] * (255 - alpha) + pen_color[2] * alpha) / 255;
p[3] = (p[3] * (255 - alpha) + pen_color[3] * alpha) / 255;
p += 4;
}
}
cursor_x += fontpixelsize;
}
}
delete[] resized_font_bitmap;
}
static void draw_text_c1(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color)
{
return draw_text_c1(pixels, w, h, w, text, x, y, fontpixelsize, color);
}
static void draw_text_c3(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color)
{
return draw_text_c3(pixels, w, h, w * 3, text, x, y, fontpixelsize, color);
}
static void draw_text_c4(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color)
{
return draw_text_c4(pixels, w, h, w * 4, text, x, y, fontpixelsize, color);
}
}
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