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截屏时获取系统DPI #4

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Merged
ChisterWu merged 1 commit into from
Jan 19, 2022
Merged

截屏时获取系统DPI #4

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7 changes: 6 additions & 1 deletion src/WPFDevelopers/Controls/ScreenCut/ScreenCut.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -183,7 +183,12 @@ void MoveAllRectangle(Point current)

System.Drawing.Bitmap CaptureScreen()
{
var bmpCaptured = new System.Drawing.Bitmap((int)SystemParameters.PrimaryScreenWidth, (int)SystemParameters.PrimaryScreenHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
//修复缩放比例不等于100%（DPI不等于96）时，不能显示全屏的问题
var source = PresentationSource.FromVisual(_canvas);
double dpiX = source.CompositionTarget.TransformToDevice.M11; //96.0 *
double dpiY = source.CompositionTarget.TransformToDevice.M22; //96.0 *

var bmpCaptured = new System.Drawing.Bitmap((int)(SystemParameters.PrimaryScreenWidth * dpiX), (int)(SystemParameters.PrimaryScreenHeight * dpiY), System.Drawing.Imaging.PixelFormat.Format24bppRgb);
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmpCaptured))
{
g.SmoothingMode = SmoothingMode.AntiAlias;
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