docs(windows): Update docs; Fix typo; To use vcpkg

Author: oktak

3rdparty/libwebp/lib/windows-x64/webp.lib

@@ -11,8 +11,7 @@ elseif (UNIX)
     link_directories("3rdparty/libwebp/lib/linux")
 elseif (WIN32)
     message(STATUS "Detected Operating System: Windows")
-    find_package (Threads)
-    link_directories("3rdparty/libwebp/lib/windows-x64")
+    link_directories("vcpkg/installed/x64-windows/lib")
 else ()
     message(FATAL_ERROR "Detected Operating System: Unknown")
 endif()
@@ -25,7 +24,7 @@ file(GLOB_RECURSE sources "src/*.cpp")
 add_executable(splitwebp main.cpp ${sources})
 target_link_libraries(splitwebp ${OpenCV_LIBS})
 if (WIN32)
-    target_link_libraries(splitwebp webp webpdemux) #[[ pthread is in Linux-like platform, Windows use Threads ]]
+    target_link_libraries(splitwebp webp webpdemux libwebpmux webpdecoder pthreadVC3)
 else ()
     target_link_libraries(splitwebp webp webpdemux pthread)
 endif()

3rdparty/libwebp/lib/windows-x64/webpdemux.lib

@@ -1,12 +1,12 @@
 # Building & Installing from source in Windows platform
 ```
-last updated: 2020-10-10
-tested at: 2020-10-09
+last updated: 2020-10-11
+tested at: 2020-10-11
 ```
 
 ## Prerequisite
 
-The steps are tested under this envionment. Please prepare these installed.
+The steps are tested under this environment. Please prepare these installed.
 
 ```
 Windows 10 (64 bit)
@@ -24,15 +24,15 @@ libwebp 1.1.0 windows-x64
 
 ## Notes on install Cmake
 
-In order to run Cmake in `CMD`, please make sure `PATH envionment variable` contains the folder of Cmake. eg: `C:\Program Files\CMake\bin`
+In order to run Cmake in `CMD`, please make sure `PATH environment variable` contains the folder of Cmake. eg: `C:\Program Files\CMake\bin`
 
 One may check this by by running `echo %PATH%` in CMD.
 
 
 ## Notes on install OpenCV
 
 The folder location of OpenCV is important. This program depends on this library.
-The downloaded OpenCV file is usually an archive (self-extracting archive). Please extract to a certain folder. eg: `D:\opencv` (i.e. the `opencv extrated folder`)
+The downloaded OpenCV file is usually an archive (self-extracting archive). Please extract to a certain folder. eg: `D:\opencv` (i.e. the `opencv extracted folder`)
 
 Copy files listed below from folder `D:\opencv\build\x64\vc15\bin` to `System32 folder`. One may need Administrator right of the Windows system to do so.
 ```
@@ -43,62 +43,72 @@ opencv_world3411d.dll
 opencv_world3411d.pdb
 ```
 
-**Alternatively**, one may add the path of OpenCV binary (eg: `D:\opencv\build\x64\vc15\bin`) to `PATH envionment variable`. You may refer to this [web page](https://www.deciphertechnic.com/install-opencv-with-visual-studio/).
+**Alternatively**, one may add the path of OpenCV binary (eg: `D:\opencv\build\x64\vc15\bin`) to `PATH environment variable`. You may refer to this [web page](https://www.deciphertechnic.com/install-opencv-with-visual-studio/).
 
 
+## Notes on install libwebp, using `vcpkg`
 
-## Notes on install libwebp
+It is known that `libwebp` uses pthread in Linux/MacOS platforms, the equivalence in Windows would be `pthreadVC3`.
 
-It locates within `Repo folder`, eg: `D:\splitwebp\3rdparty\libwebp\lib\windows-x64`
-
-Please note that, in Windows, you need to rename the files if you download libwebp from [here](https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html):
+In Windows, you need to rename the files if you download libwebp from [here](https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html):
 ```
 libwebp.lib -> webp.lib
 libwebpdemux.lib -> webpdemux.lib
 libwebpmux.lib -> webpmux.lib
 ```
 
+There is a tool named `vcpkg`, a product developed by Microsoft for managing packages for Visual Studio C++ project, it handles it automatically. Please refer the steps from this [web page](https://github.com/microsoft/vcpkg#quick-start-windows). It is advised to clone the vcpkg repository to `splitwebp` root directory, i.e. the folder of `vcpkg` would be `D:\splitwebp\vcpkg`
+
+Alternatively, you may need to modify this line: `link_directories("vcpkg/installed/x64-windows/lib")` in CMakeLists.txt accordingly.
+
 
 ## Steps to compile
 
 1. Prepare the prerequisite
 
-2. Clone this repository to `Repo folder`, eg: `D:\splitwebp`
+2. Clone this repository to `splitwebp` root directory, eg: `D:\splitwebp`
 
-3. Create a new folder named `build` under `Repo folder`, eg: `D:\splitwebp\build` (i.e. the `build folder`)
+3. Create a new folder named `build` under `splitwebp` root directory, eg: `D:\splitwebp\build` (i.e. the `build folder`)
 
 4. Open `CMD`, change the current directory to `build folder`
 
-5. Run `cmake .. && cmake -DCMAKE_GENERATOR_PLATFORM=x64 --build .`
+5. Run `.\vcpkg install pthreads:x64-windows libwebp[core,nearlossless,simd,unicode]:x64-windows`
 
-6. Visit Windows Explorer in `build folder`. Open the Visual Studio Project by double clicking `splitwebp.vcxproj`
+6. Run `cmake .. && cmake -DCMAKE_GENERATOR_PLATFORM=x64 --build .`
 
-7. Change Project properties (Solution Explorer > right click `splitwebp` > Properties)
+7. Visit Windows Explorer in `build folder`. Open the Visual Studio Project by double clicking `splitwebp.vcxproj`
 
-    7.1. pointing Include folder of OpenCV
+8. Change Project properties (Solution Explorer > right click `splitwebp` > Properties)
+
+    8.1. pointing Include folder of OpenCV
 
         In Properties, go to C/C++ > Additional Include Directories > click on the value and see a pull down menu > click Edit.. > click New Line. And add these paths:
 
-        (if your `opencv extrated folder` is `D:\opencv`)
+        (if your `opencv extracted folder` is `D:\opencv`)
 
         D:\opencv\build\include
-        D:\opencv\build\include\opencv
-        D:\opencv\build\include\opencv2
+        D:\splitwebp\vcpkg\installed\x64-windows\include
 
-    7.2. remove `/machine:x86` to build for x64 platform (64 bit). Delete `/machine:x86` in Additional Option, and click Apply.
+    8.2. remove `/machine:x86` to build for x64 platform (64 bit). Delete `/machine:x86` in Additional Option, and click Apply.
         ![s](/docs/images/remove-x86.png)
 
+    8.3. Add project Environment variable
+
+        go to Debugging > go to Environment > click on the value and see a pull down menu > click Edit.. > click New Line. And add these paths:
 
-8. Build solution. click Visual Studio's menu > Build > Build Solution (F7)
+        PATH=%PATH%;D:\splitwebp\vcpkg\installed\x64-windows\bin
 
-9. If no errors, the compiled exe file should be located at `Release` or `Debug` folder under the `build folder`, eg: `D:\splitwebp\build`
+
+9. Build solution, click Visual Studio's menu > Build > Build Solution (F7)
+
+10. If no errors, the compiled exe file should be located at `Release` or `Debug` folder under the `build folder`, eg: `D:\splitwebp\build`
 
 
 ## Troubleshoot
 
 1) > By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH
 
-    Solution: set the `envionment variable` named `OPENCV_DIR`. Open `CMD`, and run this command (This may require Administrator right. ):
+    Solution: set the `environment variable` named `OPENCV_DIR`. Open `CMD`, and run this command (This may require Administrator right. ):
 
     `setx -m OPENCV_DIR D:\opencv\build\x64\vc15\lib`
 
@@ -108,18 +118,21 @@ libwebpmux.lib -> webpmux.lib
 
     Solution: Turn on `Microsoft Symbol Servers` for debugging symbol. Please refer to this [web page](https://docs.microsoft.com/en-us/visualstudio/debugger/specify-symbol-dot-pdb-and-source-files-in-the-visual-studio-debugger?view=vs-2019) for further details.
 
+3) > webp.dll not found
 
-## Glossory
-- `CMD` Command Prompt in Windows, accept user's command. Run it by: Start Menu => search "cmd" => click "Command Prompt" OR Start Menu > "Run" > type "cmd" > press Enter
+    Solution: Press Alt F7 > go to Debugging > go to Environment > click on the value and see a pull down menu > click Edit.. > click New Line. And add these paths:
 
-- `Repo folder` The folder of this repository cloned into your local machine. eg: `D:\splitwebp`
+    `PATH=%PATH%;D:\splitwebp\vcpkg\installed\x64-windows\bin`
+
+## Glossary
+- `CMD` Command Prompt in Windows, accept user's command. Run it by: Start Menu => search "cmd" => click "Command Prompt" OR Start Menu > "Run" > type "cmd" > press Enter
 
 - `build folder` The folder where the Visual Studio project generated by Cmake locates at. eg: `D:\splitwebp\build`
 
-- `PATH envionment variable` This contains the paths that Windows system would try to find out the executive files to run when a user enter a command in CMD. One can view the content by running `echo %PATH%` in CMD.
+- `PATH environment variable` contains the paths that Windows system would try to find out the executive files to run when a user enter a command in CMD. One can view the content by running `echo %PATH%` in CMD.
 
 - `System32 folder` An important folder for Windows to run. It contains system files and libraries binary. It usually locates at `C:\Windows\System32`
 
-- `opencv extrated folder` eg: `D:/opencv`
+- `opencv extracted folder` eg: `D:/opencv`
 
-- `OPENCV_DIR` This is the path where the library files locates at. It should be inside sub-folders in `opencv extrated folder`, eg: `D:/opencv/build/x64/vc15/lib`
+- `OPENCV_DIR` This is the path where the library files locates at. It should be inside sub-folders in `opencv extracted folder`, eg: `D:/opencv/build/x64/vc15/lib`