user: 这段汇编代码用C语言表示是什么样的：

```asm
<FrameDifference>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  mov    %esi,-0x1c(%rbp)
  mov    %edx,-0x20(%rbp)
  mov    %ecx,-0x24(%rbp)
  mov    %r8d,-0x28(%rbp)
  mov    -0x1c(%rbp),%eax
  imul   -0x20(%rbp),%eax
  mov    %eax,-0x4(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  je     L73
  cmpl   $0x0,-0x1c(%rbp)
  jle    L73
  cmpl   $0x0,-0x20(%rbp)
  jle    L73
  cmpl   $0x0,-0x24(%rbp)
  jle    L73
  movl   $0x0,-0xc(%rbp)
  jmp    L142
L18:
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  test   %rax,%rax
  je     L147
  addl   $0x1,-0xc(%rbp)
L142:
  mov    -0xc(%rbp),%eax
  cmp    -0x24(%rbp),%eax
  jl     L18
  mov    -0x24(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,-0xc(%rbp)
  jmp    L131
L134:
  movl   $0x0,-0x10(%rbp)
  jmp    L93
L67:
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x10(%rbp),%eax
  cltq
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  cmp    %eax,-0x28(%rbp)
  je     L81
  mov    -0xc(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,-0x8(%rbp)
  jmp    L198
L15:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x10(%rbp),%eax
  cltq
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  cmp    %eax,-0x28(%rbp)
  jne    L136
  subl   $0x1,-0x8(%rbp)
L198:
  cmpl   $0x0,-0x8(%rbp)
  jns    L15
  jmp    L140
L136:
  nop
L140:
  cmpl   $0x0,-0x8(%rbp)
  js     L143
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x10(%rbp),%eax
  cltq
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%rcx
  mov    -0x10(%rbp),%eax
  cltq
  add    %rcx,%rax
  movzbl (%rax),%eax
  cmp    %al,%dl
  jne    L143
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x10(%rbp),%eax
  cltq
  add    %rdx,%rax
  mov    -0x28(%rbp),%edx
  mov    %dl,(%rax)
  jmp    L143
L81:
  nop
L143:
  addl   $0x1,-0x10(%rbp)
L93:
  mov    -0x10(%rbp),%eax
  cmp    -0x4(%rbp),%eax
  jl     L67
  subl   $0x1,-0xc(%rbp)
L131:
  cmpl   $0x0,-0xc(%rbp)
  jg     L134
  jmp    L65
L73:
  nop
  jmp    L65
L147:
  nop
L65:
  pop    %rbp
  ret
```

assistant: ```c
void FrameDifference(unsigned char **Image, int ImageWidth, int ImageHeight, int NumFrames, int TransparentColor) {
  const int NumPixels = ImageWidth * ImageHeight;
  int i, Frame, PrevFrame;
  if (!Image || ImageWidth <= 0 || ImageHeight <= 0 || NumFrames <= 0)
    return;
  for (Frame = 0; Frame < NumFrames; Frame++)
    if (!Image[Frame])
      return;
  for (Frame = NumFrames - 1; Frame > 0; Frame--)
    for (i = 0; i < NumPixels; i++) {
      if (Image[Frame][i] == TransparentColor)
        continue;
      for (PrevFrame = Frame - 1; PrevFrame >= 0; PrevFrame--)
        if (Image[PrevFrame][i] != TransparentColor)
          break;
      if (PrevFrame >= 0 && Image[PrevFrame][i] == Image[Frame][i])
        Image[Frame][i] = TransparentColor;
    }
}
```