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libavdevice/gdigrab: fix HIDPI support for window capture 

In Windows if using scaling other than 100% then the grabbed window was not captured fully (cropped)

Signed-off-by: Dilshod Mukhtarov <dilshodm@gmail.com>
This commit is contained in:
Dilshod Mukhtarov 2019-01-27 23:09:53 +04:00 committed by Carl Eugen Hoyos
parent 789d3b98d1
commit d7c9ddd0c4
1 changed files with 10 additions and 4 deletions
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14
libavdevice/gdigrab.c
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@ -277,14 +277,20 @@ gdigrab_read_header(AVFormatContext *s1)
}
bpp = GetDeviceCaps(source_hdc, BITSPIXEL);
horzres = GetDeviceCaps(source_hdc, HORZRES);
vertres = GetDeviceCaps(source_hdc, VERTRES);
desktophorzres = GetDeviceCaps(source_hdc, DESKTOPHORZRES);
desktopvertres = GetDeviceCaps(source_hdc, DESKTOPVERTRES);
if (hwnd) {
GetClientRect(hwnd, &virtual_rect);
/* window -- get the right height and width for scaling DPI */
virtual_rect.left = virtual_rect.left * desktophorzres / horzres;
virtual_rect.right = virtual_rect.right * desktophorzres / horzres;
virtual_rect.top = virtual_rect.top * desktopvertres / vertres;
virtual_rect.bottom = virtual_rect.bottom * desktopvertres / vertres;
} else {
/* desktop -- get the right height and width for scaling DPI */
horzres = GetDeviceCaps(source_hdc, HORZRES);
vertres = GetDeviceCaps(source_hdc, VERTRES);
desktophorzres = GetDeviceCaps(source_hdc, DESKTOPHORZRES);
desktopvertres = GetDeviceCaps(source_hdc, DESKTOPVERTRES);
virtual_rect.left = GetSystemMetrics(SM_XVIRTUALSCREEN);
virtual_rect.top = GetSystemMetrics(SM_YVIRTUALSCREEN);
virtual_rect.right = (virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN)) * desktophorzres / horzres;