1 // Scintilla source code edit control
2 /** @file PlatWin.h
3 ** Implementation of platform facilities on Windows.
4 **/
5 // Copyright 1998-2011 by Neil Hodgson <neilh@scintilla.org>
6 // The License.txt file describes the conditions under which this software may be distributed.
7
8 #ifndef PLATWIN_H
9 #define PLATWIN_H
10
11 namespace Scintilla {
12
13 #ifndef USER_DEFAULT_SCREEN_DPI
14 #define USER_DEFAULT_SCREEN_DPI 96
15 #endif
16
17 extern void Platform_Initialise(void *hInstance) noexcept;
18
19 extern void Platform_Finalise(bool fromDllMain) noexcept;
20
RectFromPRectangle(PRectangle prc)21 constexpr RECT RectFromPRectangle(PRectangle prc) noexcept {
22 RECT rc = { static_cast<LONG>(prc.left), static_cast<LONG>(prc.top),
23 static_cast<LONG>(prc.right), static_cast<LONG>(prc.bottom) };
24 return rc;
25 }
26
POINTFromPoint(Point pt)27 constexpr POINT POINTFromPoint(Point pt) noexcept {
28 return POINT{ static_cast<LONG>(pt.x), static_cast<LONG>(pt.y) };
29 }
30
PointFromPOINT(POINT pt)31 constexpr Point PointFromPOINT(POINT pt) noexcept {
32 return Point::FromInts(pt.x, pt.y);
33 }
34
HwndFromWindowID(WindowID wid)35 constexpr HWND HwndFromWindowID(WindowID wid) noexcept {
36 return static_cast<HWND>(wid);
37 }
38
HwndFromWindow(const Window & w)39 inline HWND HwndFromWindow(const Window &w) noexcept {
40 return HwndFromWindowID(w.GetID());
41 }
42
43 void *PointerFromWindow(HWND hWnd) noexcept;
44 void SetWindowPointer(HWND hWnd, void *ptr) noexcept;
45
46 /// Find a function in a DLL and convert to a function pointer.
47 /// This avoids undefined and conditionally defined behaviour.
48 template<typename T>
DLLFunction(HMODULE hModule,LPCSTR lpProcName)49 T DLLFunction(HMODULE hModule, LPCSTR lpProcName) noexcept {
50 if (!hModule) {
51 return nullptr;
52 }
53 FARPROC function = ::GetProcAddress(hModule, lpProcName);
54 static_assert(sizeof(T) == sizeof(function));
55 T fp;
56 memcpy(&fp, &function, sizeof(T));
57 return fp;
58 }
59
60 // Release an IUnknown* and set to nullptr.
61 // While IUnknown::Release must be noexcept, it isn't marked as such so produces
62 // warnings which are avoided by the catch.
63 template <class T>
ReleaseUnknown(T * & ppUnknown)64 void ReleaseUnknown(T *&ppUnknown) noexcept {
65 if (ppUnknown) {
66 try {
67 ppUnknown->Release();
68 }
69 catch (...) {
70 // Never occurs
71 }
72 ppUnknown = nullptr;
73 }
74 }
75
76
77 UINT DpiForWindow(WindowID wid) noexcept;
78
79 int SystemMetricsForDpi(int nIndex, UINT dpi) noexcept;
80
81 HCURSOR LoadReverseArrowCursor(UINT dpi) noexcept;
82
83 #if defined(USE_D2D)
84 extern bool LoadD2D();
85 extern ID2D1Factory *pD2DFactory;
86 extern IDWriteFactory *pIDWriteFactory;
87 #endif
88
89 }
90
91 #endif
92