diff --git a/stbiw/CMakeLists.txt b/stbiw/CMakeLists.txt
index b56b853..1ad1636 100644
--- a/stbiw/CMakeLists.txt
+++ b/stbiw/CMakeLists.txt
@@ -1 +1,20 @@
-message(FATAL_ERROR "请修改 stbiw/CMakeLists.txt！要求生成一个名为 stbiw 的库")
+cmake_minimum_required(VERSION 3.12)
+project(lib_stbiw LANGUAGES CXX)
+
+add_library(stbiw SHARED stb_image_write.cpp)
+target_include_directories(stbiw PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+# `add_definitions`添加宏定义到当前目录和子目录下的所有源文件中, 但是不会对外部的源文件产生影响
+# add_definitions(-DSTB_IMAGE_WRITE_IMPLEMENTATION=1)
+
+# 设置为 private, 避免宏被传播到所有引用它的文件中, 而导致的重定义错误
+target_compile_definitions(stbiw PRIVATE -DSTB_IMAGE_WRITE_IMPLEMENTATION=1)
+
+# 不能使用 `INTERFACE` 进行编译, 因为 `STB_IMAGE` 里用的是 `#ifdef` 而不是 `#ifndef`
+# add_library(stbiw INTERFACE)
+# target_include_directories(stbiw INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
+
+# option(STB_IMAGE_WRITE_IMPLEMENTATION "Enable stb_image_write implementation" OFF)
+# if (NOT ${STB_IMAGE_WRITE_IMPLEMENTATION})
+#     message(STATUS "stb_image_write is not enabled.")
+# endif()
diff --git a/stbiw/stb_image_write.cpp b/stbiw/stb_image_write.cpp
new file mode 100644
index 0000000..f56f4a8
--- /dev/null
+++ b/stbiw/stb_image_write.cpp
@@ -0,0 +1,3 @@
+#include "stb_image_write.h"
+
+int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);