user: What is the c source code of the assembly code below?

```asm
<draw_circle_circum>:
  endbr64
  push   %r15
  mov    %r8d,%r11d
  mov    %r9d,%r10d
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %ecx,%ebp
  push   %rbx
  mov    %edx,%ebx
  sub    $0x28,%rsp
  mov    0x60(%rsp),%r12d
  mov    0x68(%rsp),%r13d
  mov    %edi,0x10(%rsp)
  mov    %esi,0xc(%rsp)
  test   %edx,%edx
  je     L40
  cmp    %ebp,%ebx
  je     L19
L15:
  jl     L10
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nop
L10:
  mov    0x10(%rsp),%edx
  mov    0xc(%rsp),%eax
  movsbl %r10b,%r15d
  movsbl %r11b,%r14d
  movsbl %r12b,%r12d
  mov    %r13d,%r9d
  mov    %r15d,%ecx
  lea    (%rbx,%rdx,1),%r11d
  lea    (%rax,%rbp,1),%esi
  mov    %r12d,%r8d
  mov    %r14d,%edx
  mov    %r11d,%edi
  mov    %r11d,0x1c(%rsp)
  mov    %esi,0x14(%rsp)
  call   <draw_pixel@plt>
  mov    0x10(%rsp),%r10d
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    0x14(%rsp),%esi
  mov    %r15d,%ecx
  mov    %r14d,%edx
  sub    %ebx,%r10d
  mov    %r10d,%edi
  mov    %r10d,0x18(%rsp)
  call   <draw_pixel@plt>
  mov    0xc(%rsp),%esi
  mov    0x1c(%rsp),%edi
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  sub    %ebp,%esi
  mov    %esi,0x14(%rsp)
  call   <draw_pixel@plt>
  mov    0x14(%rsp),%esi
  mov    0x18(%rsp),%edi
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  call   <draw_pixel@plt>
  mov    0x10(%rsp),%r10d
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    0xc(%rsp),%esi
  mov    %r15d,%ecx
  mov    %r14d,%edx
  lea    0x0(%rbp,%r10,1),%r11d
  mov    %r11d,%edi
  add    %ebx,%esi
  mov    %r11d,0x14(%rsp)
  mov    %esi,0x18(%rsp)
  call   <draw_pixel@plt>
  mov    0x10(%rsp),%r10d
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    0x18(%rsp),%esi
  mov    %r15d,%ecx
  mov    %r14d,%edx
  sub    %ebp,%r10d
  mov    %r10d,%edi
  mov    %r10d,0x10(%rsp)
  call   <draw_pixel@plt>
  mov    0xc(%rsp),%ebp
  mov    0x14(%rsp),%edi
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  sub    %ebx,%ebp
  mov    %ebp,%esi
  call   <draw_pixel@plt>
  mov    0x10(%rsp),%edi
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  mov    %ebp,%esi
L25:
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1050 <draw_pixel@plt>
  nopl   0x0(%rax)
L40:
  movsbl %r11b,%r14d
  movsbl %r9b,%r15d
  lea    (%rsi,%rcx,1),%esi
  movsbl %r12b,%r8d
  mov    %r9d,0x1c(%rsp)
  mov    %r15d,%ecx
  mov    %r13d,%r9d
  mov    %r14d,%edx
  mov    %r11d,0x18(%rsp)
  mov    %r8d,0x14(%rsp)
  call   <draw_pixel@plt>
  mov    0xc(%rsp),%esi
  mov    0x10(%rsp),%edi
  mov    %r13d,%r9d
  mov    0x14(%rsp),%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  sub    %ebp,%esi
  call   <draw_pixel@plt>
  mov    0x10(%rsp),%ecx
  mov    0xc(%rsp),%esi
  mov    %r13d,%r9d
  mov    0x14(%rsp),%r8d
  mov    %r14d,%edx
  lea    0x0(%rbp,%rcx,1),%edi
  mov    %r15d,%ecx
  call   <draw_pixel@plt>
  mov    0x10(%rsp),%edi
  mov    0xc(%rsp),%esi
  mov    %r13d,%r9d
  mov    0x14(%rsp),%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  sub    %ebp,%edi
  call   <draw_pixel@plt>
  mov    0x1c(%rsp),%r10d
  mov    0x18(%rsp),%r11d
  cmp    %ebp,%ebx
  jne    L15
L19:
  mov    0x10(%rsp),%ebp
  mov    0xc(%rsp),%eax
  movsbl %r11b,%r14d
  movsbl %r10b,%r15d
  movsbl %r12b,%r12d
  mov    %r13d,%r9d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  lea    (%rbx,%rbp,1),%r10d
  lea    (%rax,%rbx,1),%esi
  mov    %r12d,%r8d
  sub    %ebx,%ebp
  mov    %r10d,%edi
  mov    %r10d,0x10(%rsp)
  mov    %esi,0x14(%rsp)
  call   <draw_pixel@plt>
  mov    0x14(%rsp),%esi
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  mov    %ebp,%edi
  call   <draw_pixel@plt>
  mov    0xc(%rsp),%esi
  mov    0x10(%rsp),%edi
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  sub    %ebx,%esi
  mov    %esi,0xc(%rsp)
  call   <draw_pixel@plt>
  mov    0xc(%rsp),%esi
  mov    %r13d,%r9d
  mov    %r12d,%r8d
  mov    %r15d,%ecx
  mov    %r14d,%edx
  mov    %ebp,%edi
  jmp    L25
```

assistant: ```c
void draw_circle_circum(int cx, int cy, int x, int y, char r, char g, char b, int screen) {
  int tx, ty;
  if (x == 0) {
    draw_pixel(cx, cy + y, r, g, b, screen);
    draw_pixel(cx, cy - y, r, g, b, screen);
    draw_pixel(cx + y, cy, r, g, b, screen);
    draw_pixel(cx - y, cy, r, g, b, screen);
  }
  if (x == y) {
    draw_pixel(cx + x, cy + y, r, g, b, screen);
    draw_pixel(cx - x, cy + y, r, g, b, screen);
    draw_pixel(cx + x, cy - y, r, g, b, screen);
    draw_pixel(cx - x, cy - y, r, g, b, screen);
  }
  if (x < y) {
    draw_pixel(cx + x, cy + y, r, g, b, screen);
    draw_pixel(cx - x, cy + y, r, g, b, screen);
    draw_pixel(cx + x, cy - y, r, g, b, screen);
    draw_pixel(cx - x, cy - y, r, g, b, screen);
    draw_pixel(cx + y, cy + x, r, g, b, screen);
    draw_pixel(cx - y, cy + x, r, g, b, screen);
    draw_pixel(cx + y, cy - x, r, g, b, screen);
    draw_pixel(cx - y, cy - x, r, g, b, screen);
  }
}
```