GUI桌面环境

Gui/BitmapExtensions.cs

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+using Cosmos.System.Graphics;
+using System;
+
+namespace CMLeonOS.Gui
+{
+    internal static class BitmapExtensions
+    {
+        internal static Bitmap Resize(this Bitmap bmp, uint width, uint height)
+        {
+            if (bmp.Width == width && bmp.Height == height)
+            {
+                return bmp;
+            }
+
+            if (bmp.Depth != ColorDepth.ColorDepth32)
+            {
+                throw new Exception("Resize can only resize images with a colour depth of 32.");
+            }
+
+            Bitmap res = new Bitmap(width, height, ColorDepth.ColorDepth32);
+
+            for (int y = 0; y < height; y++)
+            {
+                for (int x = 0; x < width; x++)
+                {
+                    double xDouble = (double)x / (double)width;
+                    double yDouble = (double)y / (double)height;
+
+                    uint origX = (uint)((double)bmp.Width * xDouble);
+                    uint origY = (uint)((double)bmp.Height * yDouble);
+
+                    res.RawData[y * width + x] = bmp.RawData[(origY * bmp.Width) + origX];
+                }
+            }
+
+            return res;
+        }
+
+        internal static Bitmap ResizeWidthKeepRatio(this Bitmap bmp, uint width)
+        {
+            return Resize(bmp, width, (uint)((double)bmp.Height * ((double)width / (double)bmp.Width)));
+        }
+
+        internal static Bitmap ResizeHeightKeepRatio(this Bitmap bmp, uint height)
+        {
+            return Resize(bmp, (uint)((double)bmp.Width * ((double)height / (double)bmp.Height)), height);
+        }
+    }
+}