1 files changed, 121 insertions, 0 deletions
diff --git a/java/org/gnu/emacs/EmacsGC.java b/java/org/gnu/emacs/EmacsGC.java
new file mode 100644
index 00000000000..e45f0666fe2
--- /dev/null
+++ b/java/org/gnu/emacs/EmacsGC.java
@@ -0,0 +1,121 @@
+/* Communication module for Android terminals.  -*- c-file-style: "GNU" -*-
+
+Copyright (C) 2023-2024 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
+
+package org.gnu.emacs;
+
+import android.graphics.Rect;
+import android.graphics.Paint;
+
+import android.graphics.PorterDuff.Mode;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Xfermode;
+
+/* X like graphics context structures.  Keep the enums in synch with
+   androidgui.h! */
+
+public final class EmacsGC extends EmacsHandleObject
+{
+  public static final int GC_COPY = 0;
+  public static final int GC_XOR  = 1;
+
+  public static final int GC_FILL_SOLID			= 0;
+  public static final int GC_FILL_OPAQUE_STIPPLED	= 1;
+
+  public static final Xfermode xorAlu, srcInAlu;
+
+  public int function, fill_style;
+  public int foreground, background;
+  public int clip_x_origin, clip_y_origin;
+  public int ts_origin_x, ts_origin_y;
+  public Rect clip_rects[], real_clip_rects[];
+  public EmacsPixmap clip_mask, stipple;
+  public Paint gcPaint;
+
+  /* ID incremented every time the clipping rectangles of any GC
+     changes.  */
+  private static long clip_serial;
+
+  /* The value of clipRectID after the last time this GCs clip
+     rectangles changed.  0 if there are no clip rectangles.  */
+  public long clipRectID;
+
+  static
+  {
+    xorAlu = new PorterDuffXfermode (Mode.XOR);
+    srcInAlu = new PorterDuffXfermode (Mode.SRC_IN);
+  }
+
+  /* The following fields are only set on immutable GCs.  */
+
+  public
+  EmacsGC (short handle)
+  {
+    /* For historical reasons the C code has an extra layer of
+       indirection above this GC handle.  struct android_gc is the GC
+       used by Emacs code, while android_gcontext is the type of the
+       handle.  */
+    super (handle);
+
+    fill_style = GC_FILL_SOLID;
+    function = GC_COPY;
+    foreground = 0;
+    background = 0xffffff;
+    gcPaint = new Paint ();
+  }
+
+  /* Mark this GC as dirty.  Apply parameters to the paint and
+     recompute real_clip_rects.  */
+
+  public void
+  markDirty (boolean clipRectsChanged)
+  {
+    int i;
+
+    if (clipRectsChanged)
+      {
+	if ((ts_origin_x != 0 || ts_origin_y != 0)
+	    && clip_rects != null)
+	  {
+	    real_clip_rects = new Rect[clip_rects.length];
+
+	    for (i = 0; i < clip_rects.length; ++i)
+	      {
+		real_clip_rects[i] = new Rect (clip_rects[i]);
+		real_clip_rects[i].offset (ts_origin_x, ts_origin_y);
+	      }
+	  }
+	else
+	  real_clip_rects = clip_rects;
+
+	clipRectID = ++clip_serial;
+      }
+
+    gcPaint.setStrokeWidth (1f);
+    gcPaint.setColor (foreground | 0xff000000);
+    gcPaint.setXfermode (function == GC_XOR
+			 ? xorAlu : srcInAlu);
+  }
+
+  public void
+  resetXfermode ()
+  {
+    gcPaint.setXfermode (function == GC_XOR
+			 ? xorAlu : srcInAlu);
+  }
+};