1 files changed, 120 insertions, 0 deletions
diff --git a/java/org/gnu/emacs/EmacsSdk23FontDriver.java b/java/org/gnu/emacs/EmacsSdk23FontDriver.java
new file mode 100644
index 00000000000..91153feaa11
--- /dev/null
+++ b/java/org/gnu/emacs/EmacsSdk23FontDriver.java
@@ -0,0 +1,120 @@
+/* Font backend 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.Paint;
+import android.graphics.Rect;
+
+public final class EmacsSdk23FontDriver extends EmacsSdk7FontDriver
+{
+  private void
+  textExtents1 (Sdk7FontObject font, int code, FontMetrics metrics,
+		Paint paint, Rect bounds)
+  {
+    char[] text;
+
+    text = new char[2];
+    text[0] = (char) code;
+    text[1] = 'c';
+
+    paint.getTextBounds (text, 0, 1, bounds);
+
+    metrics.lbearing = (short) bounds.left;
+    metrics.rbearing = (short) bounds.right;
+    metrics.ascent = (short) -bounds.top;
+    metrics.descent = (short) bounds.bottom;
+    metrics.width
+      = (short) paint.getRunAdvance (text, 0, 1, 0, 1, false, 1);
+  }
+
+  @Override
+  public void
+  textExtents (FontObject font, int code[], FontMetrics fontMetrics)
+  {
+    int i;
+    Paint paintCache;
+    Rect boundsCache;
+    Sdk7FontObject fontObject;
+    char[] text;
+    float width;
+
+    fontObject = (Sdk7FontObject) font;
+    paintCache = fontObject.typeface.typefacePaint;
+    paintCache.setTextSize (fontObject.pixelSize);
+    boundsCache = new Rect ();
+
+    if (code.length == 0)
+      {
+	fontMetrics.lbearing = 0;
+	fontMetrics.rbearing = 0;
+	fontMetrics.ascent = 0;
+	fontMetrics.descent = 0;
+	fontMetrics.width = 0;
+      }
+    else if (code.length == 1)
+      textExtents1 ((Sdk7FontObject) font, code[0], fontMetrics,
+		    paintCache, boundsCache);
+    else
+      {
+	text = new char[code.length + 1];
+
+	for (i = 0; i < code.length; ++i)
+	  text[i] = (char) code[i];
+
+	text[code.length] = 'c';
+
+	paintCache.getTextBounds (text, 0, code.length,
+				  boundsCache);
+	width = paintCache.getRunAdvance (text, 0, code.length, 0,
+					  code.length,
+					  false, code.length);
+
+	fontMetrics.lbearing = (short) boundsCache.left;
+	fontMetrics.rbearing = (short) boundsCache.right;
+	fontMetrics.ascent = (short) -boundsCache.top;
+	fontMetrics.descent = (short) boundsCache.bottom;
+	fontMetrics.width = (short) width;
+      }
+  }
+
+  @Override
+  public int
+  hasChar (FontSpec font, int charCode)
+  {
+    Sdk7FontObject fontObject;
+    Paint paint;
+
+    if (font instanceof Sdk7FontObject)
+      {
+	fontObject = (Sdk7FontObject) font;
+	paint = fontObject.typeface.typefacePaint;
+      }
+    else
+      paint = ((Sdk7FontEntity) font).typeface.typefacePaint;
+
+    /* If the character falls within the confines of the BMP, return
+       1.  */
+    if (charCode < 65536)
+      return paint.hasGlyph (String.valueOf ((char) charCode)) ? 1 : 0;
+
+    /* Otherwise return 0.  */
+    return 0;
+  }
+};