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override Win10 dpi scaling in screengrab

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(cherry picked from commit 45ead62d6431c8339613e8ced85b705c80a7fdc9)
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nulano 2019-07-25 21:34:58 +02:00 committed by Andrew Murray
parent 6de118abd3
commit cacbdc680c
1 changed files with 21 additions and 0 deletions
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21
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 = LoadLibraryA("User32.dll");
Func_SetThreadDpiAwarenessContext SetThreadDpiAwarenessContext_function;
if (!PyArg_ParseTuple(args, "|i", &includeLayeredWindows))
return NULL;
@ -339,9 +344,25 @@ 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
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);
}
width = GetDeviceCaps(screen, HORZRES);
height = GetDeviceCaps(screen, VERTRES);
if (SetThreadDpiAwarenessContext_function != NULL) {
dpiAwareness = SetThreadDpiAwarenessContext_function(dpiAwareness);
}
FreeLibrary(user32);
bitmap = CreateCompatibleBitmap(screen, width, height);
if (!bitmap)
goto error;