user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<IMAGE_STRETCH2XPLUS>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,-0x38(%rbp)
  mov    %esi,-0x3c(%rbp)
  mov    %edx,-0x40(%rbp)
  mov    %ecx,-0x44(%rbp)
  mov    %r8d,-0x48(%rbp)
  mov    %r9,-0x50(%rbp)
  mov    -0x38(%rbp),%rbx
  mov    -0x50(%rbp),%r15
  mov    -0x3c(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    %eax,-0x54(%rbp)
  mov    -0x40(%rbp),%r12d
  mov    -0x40(%rbp),%eax
  sar    %eax
  mov    %eax,%r14d
  mov    0x18(%rbp),%eax
  lea    (%rax,%rax,1),%ecx
  mov    %ecx,-0x5c(%rbp)
  mov    -0x40(%rbp),%eax
  add    %eax,%eax
  sub    %r14d,%eax
  cltd
  idiv   %ecx
  mov    %eax,%r13d
  mov    %r13d,-0x58(%rbp)
  test   %r12d,%r12d
  je     L59
  mov    -0x3c(%rbp),%eax
  mov    0x30(%rbp),%r8
  mov    0x10(%rbp),%ecx
  mov    %r15,%rdx
  mov    %eax,%esi
  mov    %rbx,%rdi
  call   *%r8
  mov    0x20(%rbp),%eax
  cltq
  add    %rax,%r15
  sub    %r13d,%r12d
  test   %r12d,%r12d
  jne    L16
  sub    $0x1,%r13d
  mov    %r13d,-0x58(%rbp)
  jmp    L142
L102:
  mov    -0x44(%rbp),%eax
  cltq
  add    %rbx,%rax
  mov    -0x54(%rbp),%edx
  mov    %rbx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x44(%rbp),%eax
  cltq
  add    %rax,%rbx
L16:
  sub    $0x1,%r12d
  test   %r12d,%r12d
  je     L17
  sub    -0x5c(%rbp),%r14d
  test   %r14d,%r14d
  jns    L102
  mov    -0x40(%rbp),%eax
  add    %r14d,%eax
  mov    %eax,%r14d
  mov    %rbx,%r13
L90:
  mov    -0x44(%rbp),%eax
  cltq
  add    %rax,%rbx
  sub    $0x1,%r12d
  test   %r12d,%r12d
  je     L81
  sub    -0x5c(%rbp),%r14d
  test   %r14d,%r14d
  jns    L90
  mov    -0x40(%rbp),%eax
  add    %r14d,%eax
  mov    %eax,%r14d
  mov    -0x44(%rbp),%eax
  cltq
  lea    (%rbx,%rax,1),%rdx
  mov    -0x44(%rbp),%eax
  cltq
  lea    0x0(%r13,%rax,1),%rsi
  mov    -0x3c(%rbp),%eax
  mov    0x38(%rbp),%r10
  mov    0x10(%rbp),%r9d
  mov    %r15,%r8
  mov    %eax,%ecx
  mov    %r13,%rdi
  call   *%r10
  mov    -0x44(%rbp),%eax
  cltq
  add    %rax,%r13
  mov    0x20(%rbp),%eax
  cltq
  add    %rax,%r15
  jmp    L42
L25:
  mov    -0x44(%rbp),%eax
  cltq
  add    %r13,%rax
  mov    -0x54(%rbp),%edx
  mov    %r13,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x44(%rbp),%eax
  cltq
  add    %rax,%r13
L42:
  cmp    %rbx,%r13
  jne    L25
  mov    -0x44(%rbp),%eax
  cltq
  add    %rax,%rbx
  jmp    L16
L81:
  nop
  jmp    L143
L45:
  mov    -0x44(%rbp),%eax
  cltq
  add    %r13,%rax
  mov    -0x54(%rbp),%edx
  mov    %r13,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x44(%rbp),%eax
  cltq
  add    %rax,%r13
L143:
  cmp    %rbx,%r13
  jne    L45
  jmp    L142
L17:
  nop
L142:
  jmp    L108
L68:
  mov    -0x44(%rbp),%eax
  cltq
  add    %rbx,%rax
  mov    -0x54(%rbp),%edx
  mov    %rbx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x44(%rbp),%eax
  cltq
  add    %rax,%rbx
L108:
  mov    -0x58(%rbp),%eax
  lea    -0x1(%rax),%edi
  mov    %edi,-0x58(%rbp)
  test   %eax,%eax
  jne    L68
L59:
  nop
  add    $0x38,%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
void IMAGE_STRETCH2XPLUS(unsigned char *dest_ptr, int dest_dx, int dest_dy, int dest_pitch, int dest_bpp, unsigned char *src_ptr, int src_dx, int src_dy, int src_pitch, int src_bpp, void (*row_func)(unsigned char *, int, unsigned char *, int), void (*row2x_func)(unsigned char *, unsigned char *, unsigned char *, int, unsigned char *, int)) {
  register unsigned char *d = dest_ptr, *d1;
  register unsigned char *s = src_ptr;
  register int dest_dx_bytes = dest_dx * dest_bpp;
  register int count = dest_dy;
  register int limit = dest_dy >> 1;
  register int step = src_dy << 1;
  register int remainder = (2 * dest_dy - limit) / step;
  if (count) {
    (*row_func)(d, dest_dx, s, src_dx);
    s += src_pitch;
    if (!(count -= remainder)) {
      remainder--;
      goto end;
    }
    while (1) {
      goto start;
      do {
        memcpy(d + dest_pitch, d, dest_dx_bytes);
        d += dest_pitch;
      start:
        if (!(--count))
          goto end;
      } while ((limit -= step) >= 0);
      limit += dest_dy;
      d1 = d;
      do {
        d += dest_pitch;
        if (!(--count))
          goto end_2;
      } while ((limit -= step) >= 0);
      limit += dest_dy;
      (*row2x_func)(d1, d1 + dest_pitch, d + dest_pitch, dest_dx, s, src_dx);
      d1 += dest_pitch;
      s += src_pitch;
      while (d1 != d) {
        memcpy(d1 + dest_pitch, d1, dest_dx_bytes);
        d1 += dest_pitch;
      }
      d += dest_pitch;
    }
  end_2:
    while (d1 != d) {
      memcpy(d1 + dest_pitch, d1, dest_dx_bytes);
      d1 += dest_pitch;
    }
  end:
    while (remainder--) {
      memcpy(d + dest_pitch, d, dest_dx_bytes);
      d += dest_pitch;
    }
  }
}
```