Here is my learning from the RnD I did on system settings app (immersive control panel). (see my other answer for a simple C++ API I created from this learning – https://stackoverflow.com/a/58066736/981766. A simpler method for single monitor setups, or if you want to change DPI of just the prmary monitor is given here – … Read more
You have to copy the bits over a new image with the target resolution, like this: using (Bitmap bitmap = (Bitmap)Image.FromFile(“file.jpg”)) { using (Bitmap newBitmap = new Bitmap(bitmap)) { newBitmap.SetResolution(300, 300); newBitmap.Save(“file300.jpg”, ImageFormat.Jpeg); } }
Assuming you do not try to honor the user’s UI font choice (SystemFonts.IconTitleFont), and hard-code your forms for one font size only (e.g. Tahoma 8pt, Microsoft Sans Serif 8.25pt), you can set your form’s AutoScaleMode to ScaleMode.Dpi. This will scale the size of the form and most of it child controls by the factor CurrentDpiSetting … Read more
You could easily let your website address users with settings at higher zoom levels by including a media query like: @media only screen and( -webkit-min-device-pixel-ratio: 1.25 ), only screen and( -o-min-device-pixel-ratio: 5/4 ), only screen and( min-resolution: 120dpi ), only screen and( min-resolution: 1.25dppx ) { body { font-size: 1rem; } } See this article … Read more
The problem was, that I had no default layout folder. I tried getting by, using only the sw600dp and sw720dp folders. I still have no idea why they don’t work, but I don’t care. I can’t use swxxxdp <3.2 anyway, so screw that. So if you want to write an app, that has to support … Read more
Transforming a known size to device pixels If your visual element is already attached to a PresentationSource (for example, it is part of a window that is visible on screen), the transform is found this way: var source = PresentationSource.FromVisual(element); Matrix transformToDevice = source.CompositionTarget.TransformToDevice; If not, use HwndSource to create a temporary hWnd: Matrix transformToDevice; … Read more
In any up-to-date Windows Insider builds (build >= 14342, SDK version# >= 14332) there is an EnableNonClientDpiScaling API (which takes an HWND as its argument) that will enable non-client DPI scaling for top-level HWNDs. This functionality requires that the top-level window be running in per-monitor DPI-awareness mode. This API should be called from the WM_NCCREATE … Read more
It would be helpful to provide a JSBin. Anyway, since I had this layout in JSBin with col-sm-(asterisk), you can just change all the -sm- to -xs- in between the print media query. All percentages are the same at every breakpoint, so changing sm to xs will print that and ignore the other col-(asterisk) classes. … Read more
High DPI support is enabled from Qt 5.6 onward. Setting QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling) in your application source code allows automatic high-DPI scaling. NOTICE: To use the attribute method, you must set the attribute before you create your QApplication object: #include <QApplication> int main(int argc, char *argv[]) { QApplication::setAttribute(Qt::AA_EnableHighDpiScaling); QApplication app(argc, argv); return app.exec(); }