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gdigrab: grab right desktop size if DPI in use, based on patch from Alexander Brotzge 

Signed-off-by: Matt Oliver <protogonoi@gmail.com>
This commit is contained in:
Matt Oliver 2015-10-05 20:00:37 +11:00
parent 8d9f86bd37
commit e82883aa88
1 changed files with 17 additions and 11 deletions
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28
libavdevice/gdigrab.c
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@ -235,6 +235,8 @@ gdigrab_read_header(AVFormatContext *s1)
AVStream *st = NULL;
int bpp;
int vertres;
int desktopvertres;
RECT virtual_rect;
RECT clip_rect;
BITMAP bmp;
@ -263,13 +265,26 @@ gdigrab_read_header(AVFormatContext *s1)
goto error;
}
/* This will get the device context for the selected window, or if
* none, the primary screen */
source_hdc = GetDC(hwnd);
if (!source_hdc) {
WIN32_API_ERROR("Couldn't get window device context");
ret = AVERROR(EIO);
goto error;
}
bpp = GetDeviceCaps(source_hdc, BITSPIXEL);
if (hwnd) {
GetClientRect(hwnd, &virtual_rect);
} else {
/* desktop -- get the right height and width for scaling DPI */
vertres = GetDeviceCaps(source_hdc, VERTRES);
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);
virtual_rect.bottom = virtual_rect.top + GetSystemMetrics(SM_CYVIRTUALSCREEN);
virtual_rect.right = (virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN)) * desktopvertres / vertres;
virtual_rect.bottom = (virtual_rect.top + GetSystemMetrics(SM_CYVIRTUALSCREEN)) * desktopvertres / vertres;
}
/* If no width or height set, use full screen/window area */
@ -299,15 +314,6 @@ gdigrab_read_header(AVFormatContext *s1)
goto error;
}
/* This will get the device context for the selected window, or if
* none, the primary screen */
source_hdc = GetDC(hwnd);
if (!source_hdc) {
WIN32_API_ERROR("Couldn't get window device context");
ret = AVERROR(EIO);
goto error;
}
bpp = GetDeviceCaps(source_hdc, BITSPIXEL);
if (name) {
av_log(s1, AV_LOG_INFO,