GUI桌面环境

Gui/SmoothMono/TextRenderer.cs

@@ -0,0 +1,64 @@
+using System.Drawing;
+
+namespace CMLeonOS.Gui.SmoothMono
+{
+    public static class TextRenderer
+    {
+        private static uint FastBlend(uint src, uint dst, uint t)
+        {
+            uint s = 255 - t;
+            return (
+                (uint)(((((src >> 0) & 0xff) * s +
+                    ((dst >> 0) & 0xff) * t) >> 8) |
+                (((((src >> 8) & 0xff) * s +
+                    ((dst >> 8) & 0xff) * t)) & ~0xff) |
+                (((((src >> 16) & 0xff) * s +
+                    ((dst >> 16) & 0xff) * t) << 8) & ~0xffff) |
+                0xff000000)
+            );
+        }
+
+        private static void DrawChar(char c, int color, int[] buffer, int bufferWidth, int bufferHeight, int x, int y)
+        {
+            byte[] bytes = FontData.Chars[c];
+            if (bytes != null)
+            {
+                for (int i = 0; i < FontData.Width; i++)
+                {
+                    int finalX = x + i;
+                    if (finalX < 0 || finalX >= bufferWidth) continue;
+
+                    for (int j = 0; j < FontData.Height; j++)
+                    {
+                        int finalY = y + j;
+                        if (finalY < 0 || finalY >= bufferHeight) continue;
+
+                        byte invAlpha = (byte)(255 - bytes[(j * FontData.Width) + i]);
+                        if (invAlpha == 255) continue;
+
+                        int k = ((finalY * bufferWidth) + finalX);
+
+                        buffer[k] = (int)FastBlend((uint)color, (uint)buffer[k], invAlpha);
+                    }
+                }
+            }
+        }
+
+        public static void DrawString(string str, Color color, int[] buffer, int bufferWidth, int bufferHeight, int x, int y)
+        {
+            int charX = x;
+            int charY = y;
+            for (int i = 0; i < str.Length; i++)
+            {
+                if (str[i] == '\n')
+                {
+                    charX = x;
+                    charY += FontData.Height;
+                    continue;
+                }
+                DrawChar(str[i], color.ToArgb(), buffer, bufferWidth, bufferHeight, charX, charY);
+                charX += FontData.Width;
+            }
+        }
+    }
+}