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Merge pull request #4000 from nulano/dpi_fix

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Fix Screengrab DPI scaling on Windows 10 version 1607+
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Andrew Murray 2019-09-30 19:50:46 +10:00 committed by GitHub
commit aaf2c42156
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1 changed files with 22 additions and 0 deletions
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src/display.c
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@ -319,6 +319,8 @@ PyImaging_DisplayModeWin32(PyObject* self, PyObject* args)
/* -------------------------------------------------------------------- */
/* Windows screen grabber */
typedef HANDLE(__stdcall* Func_SetThreadDpiAwarenessContext)(HANDLE);
PyObject*
PyImaging_GrabScreenWin32(PyObject* self, PyObject* args)
{
@ -329,6 +331,9 @@ PyImaging_GrabScreenWin32(PyObject* self, PyObject* args)
HDC screen, screen_copy;
DWORD rop;
PyObject* buffer;
HANDLE dpiAwareness;
HMODULE user32;
Func_SetThreadDpiAwarenessContext SetThreadDpiAwarenessContext_function;
if (!PyArg_ParseTuple(args, "|ii", &includeLayeredWindows, &all_screens))
return NULL;
@ -339,6 +344,17 @@ PyImaging_GrabScreenWin32(PyObject* self, PyObject* args)
screen = CreateDC("DISPLAY", NULL, NULL, NULL);
screen_copy = CreateCompatibleDC(screen);
// added in Windows 10 (1607)
// loaded dynamically to avoid link errors
user32 = LoadLibraryA("User32.dll");
SetThreadDpiAwarenessContext_function =
(Func_SetThreadDpiAwarenessContext)
GetProcAddress(user32, "SetThreadDpiAwarenessContext");
if (SetThreadDpiAwarenessContext_function != NULL) {
// DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE = ((DPI_CONTEXT_HANDLE)-3)
dpiAwareness = SetThreadDpiAwarenessContext_function((HANDLE) -3);
}
if (all_screens) {
x = GetSystemMetrics(SM_XVIRTUALSCREEN);
y = GetSystemMetrics(SM_YVIRTUALSCREEN);
@ -349,6 +365,12 @@ PyImaging_GrabScreenWin32(PyObject* self, PyObject* args)
height = GetDeviceCaps(screen, VERTRES);
}
if (SetThreadDpiAwarenessContext_function != NULL) {
SetThreadDpiAwarenessContext_function(dpiAwareness);
}
FreeLibrary(user32);
bitmap = CreateCompatibleBitmap(screen, width, height);
if (!bitmap)
goto error;