Add NightShot source

include/image_io.hpp

@@ -0,0 +1,28 @@
+#pragma once
+#include "config.hpp"
+#include "settings.hpp"
+#include <windows.h>
+#include <objidl.h>
+#include <gdiplus.h>
+#include <string>
+#include <vector>
+
+[[nodiscard]] int findEncoderClsid(const WCHAR* mimeType, CLSID* clsid);
+[[nodiscard]] bool saveBitmapAsPng(Gdiplus::Bitmap& bitmap, const std::wstring& path);
+[[nodiscard]] bool saveBitmapAsJpeg(Gdiplus::Bitmap& bitmap, const std::wstring& path, int quality);
+[[nodiscard]] bool copyBitmapToClipboard(HWND owner, Gdiplus::Bitmap& bitmap);
+[[nodiscard]] bool encodeBitmapAsPng(Gdiplus::Bitmap& bitmap, std::vector<BYTE>& output);
+
+// Reserves a non-existing incremented file name with CREATE_NEW. The returned
+// empty file belongs to the caller and may safely be filled/overwritten.
+[[nodiscard]] std::wstring reserveIncrementedPath(
+    const std::wstring& directory, const wchar_t* prefix,
+    const wchar_t* extension);
+
+[[nodiscard]] bool saveScreenshotIncremented(
+    Gdiplus::Bitmap& bitmap, const settings::AppSettings& configuration,
+    std::wstring& savedPath);
+
+enum class PrintBitmapResult { Printed, Cancelled, Failed };
+[[nodiscard]] PrintBitmapResult printBitmap(HWND owner, Gdiplus::Bitmap& bitmap);
+[[nodiscard]] std::wstring choosePngPath(HWND owner);