feat: support font variants (bold/italic) from ~/.termux

terminal-view/src/main/java/com/termux/view/TerminalRenderer.java

@@ -1,5 +1,5 @@
 package com.termux.view;
-
+import java.io.File;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.PorterDuff;
@@ -21,6 +21,10 @@ public final class TerminalRenderer {
     final int mTextSize;
     final Typeface mTypeface;
     private final Paint mTextPaint = new Paint();
+    private Typeface regularTypeface;
+    private Typeface boldTypeface;
+    private Typeface italicTypeface;
+    private Typeface boldItalicTypeface;
 
     /** The width of a single mono spaced character obtained by {@link Paint#measureText(String)} on a single 'X'. */
     final float mFontWidth;
@@ -51,6 +55,27 @@ public TerminalRenderer(int textSize, Typeface typeface) {
             sb.setCharAt(0, (char) i);
             asciiMeasures[i] = mTextPaint.measureText(sb, 0, 1);
         }
+
+
+        regularTypeface = typeface;
+
+        boldTypeface = loadFontOrFallback(
+            new File("/data/data/com.termux/files/home/.termux/font-bold.ttf"),
+            regularTypeface,
+            Typeface.BOLD
+        );
+
+        italicTypeface = loadFontOrFallback(
+            new File("/data/data/com.termux/files/home/.termux/font-italic.ttf"),
+            regularTypeface,
+            Typeface.ITALIC
+        );
+
+        boldItalicTypeface = loadFontOrFallback(
+            new File("/data/data/com.termux/files/home/.termux/font-bold-italic.ttf"),
+            regularTypeface,
+            Typeface.BOLD_ITALIC
+        );
     }
 
     /** Render the terminal to a canvas with at a specified row scroll, and an optional rectangular selection. */
@@ -214,26 +239,44 @@ private void drawTextRun(Canvas canvas, char[] text, int[] palette, float y, int
         }
 
         if ((effect & TextStyle.CHARACTER_ATTRIBUTE_INVISIBLE) == 0) {
+
             if (dim) {
                 int red = (0xFF & (foreColor >> 16));
                 int green = (0xFF & (foreColor >> 8));
                 int blue = (0xFF & foreColor);
-                // Dim color handling used by libvte which in turn took it from xterm
-                // (https://bug735245.bugzilla-attachments.gnome.org/attachment.cgi?id=284267):
+
                 red = red * 2 / 3;
                 green = green * 2 / 3;
                 blue = blue * 2 / 3;
+
                 foreColor = 0xFF000000 + (red << 16) + (green << 8) + blue;
             }
 
-            mTextPaint.setFakeBoldText(bold);
+            if (bold && italic) {
+                mTextPaint.setTypeface(boldItalicTypeface);
+            } else if (bold) {
+                mTextPaint.setTypeface(boldTypeface);
+            } else if (italic) {
+                mTextPaint.setTypeface(italicTypeface);
+            } else {
+                mTextPaint.setTypeface(regularTypeface);
+            }
+
             mTextPaint.setUnderlineText(underline);
-            mTextPaint.setTextSkewX(italic ? -0.35f : 0.f);
             mTextPaint.setStrikeThruText(strikeThrough);
             mTextPaint.setColor(foreColor);
 
-            // The text alignment is the default Paint.Align.LEFT.
-            canvas.drawTextRun(text, startCharIndex, runWidthChars, startCharIndex, runWidthChars, left, y - mFontLineSpacingAndAscent, false, mTextPaint);
+            canvas.drawTextRun(
+                text,
+                startCharIndex,
+                runWidthChars,
+                startCharIndex,
+                runWidthChars,
+                left,
+                y - mFontLineSpacingAndAscent,
+                false,
+                mTextPaint
+            );
         }
 
         if (savedMatrix) canvas.restore();
@@ -246,4 +289,11 @@ public float getFontWidth() {
     public int getFontLineSpacing() {
         return mFontLineSpacing;
     }
+
+
+    private Typeface loadFontOrFallback(File file, Typeface base, int style) {
+        return file.exists()
+            ? Typeface.createFromFile(file)
+            : Typeface.create(base, style);
+    }
 }