Fix TextOverlay's overlay width measuring strategy

Before this CL, the text with a scale span would wrap text, with because the scale wasn't taken into account when measuring the width of the overlay.

PiperOrigin-RevId: 548123626

libraries/effect/src/androidTest/java/androidx/media3/effect/OverlayShaderProgramPixelTest.java

@@ -35,6 +35,7 @@ import android.opengl.Matrix;
 import android.text.Spannable;
 import android.text.SpannableString;
 import android.text.style.ForegroundColorSpan;
+import android.text.style.RelativeSizeSpan;
 import androidx.media3.common.VideoFrameProcessingException;
 import androidx.media3.common.util.GlUtil;
 import androidx.media3.common.util.Size;
@@ -71,6 +72,8 @@ public class OverlayShaderProgramPixelTest {
       "media/bitmap/sample_mp4_first_frame/electrical_colors/overlay_bitmap_translucent.png";
   private static final String OVERLAY_TEXT_DEFAULT =
       "media/bitmap/sample_mp4_first_frame/electrical_colors/overlay_text_default.png";
+  private static final String OVERLAY_TEXT_SPAN_SCALED =
+      "media/bitmap/sample_mp4_first_frame/electrical_colors/overlay_text_span_scaled.png";
   private static final String OVERLAY_TEXT_TRANSLATE =
       "media/bitmap/sample_mp4_first_frame/electrical_colors/overlay_text_translate.png";
   private static final String OVERLAY_MULTIPLE =
@@ -302,6 +305,33 @@ public class OverlayShaderProgramPixelTest {
     assertThat(averagePixelAbsoluteDifference).isAtMost(MAXIMUM_AVERAGE_PIXEL_ABSOLUTE_DIFFERENCE);
   }
 
+  @Test
+  public void drawFrame_textOverlayWithRelativeScaleSpan_blendsTextIntoFrame() throws Exception {
+    String testId = "drawFrame_textOverlayWithRelativeScaleSpan";
+    SpannableString overlayText = new SpannableString(/* source= */ "helllllloooo!!!");
+    overlayText.setSpan(
+        new RelativeSizeSpan(2f),
+        /* start= */ 0,
+        /* end= */ overlayText.length(),
+        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+    TextOverlay staticTextOverlay = TextOverlay.createStaticTextOverlay(overlayText);
+    overlayShaderProgram =
+        new OverlayEffect(ImmutableList.of(staticTextOverlay))
+            .toGlShaderProgram(context, /* useHdr= */ false);
+    Size outputSize = overlayShaderProgram.configure(inputWidth, inputHeight);
+    setupOutputTexture(outputSize.getWidth(), outputSize.getHeight());
+    Bitmap expectedBitmap = readBitmap(OVERLAY_TEXT_SPAN_SCALED);
+
+    overlayShaderProgram.drawFrame(inputTexId, /* presentationTimeUs= */ 0);
+    Bitmap actualBitmap =
+        createArgb8888BitmapFromFocusedGlFramebuffer(outputSize.getWidth(), outputSize.getHeight());
+
+    maybeSaveTestBitmap(testId, /* bitmapLabel= */ "actual", actualBitmap, /* path= */ null);
+    float averagePixelAbsoluteDifference =
+        getBitmapAveragePixelAbsoluteDifferenceArgb8888(expectedBitmap, actualBitmap, testId);
+    assertThat(averagePixelAbsoluteDifference).isAtMost(MAXIMUM_AVERAGE_PIXEL_ABSOLUTE_DIFFERENCE);
+  }
+
   @Test
   public void drawFrame_translatedTextOverlay_blendsTextIntoFrame() throws Exception {
     String testId = "drawFrame_translatedTextOverlay";

libraries/effect/src/main/java/androidx/media3/effect/TextOverlay.java

@@ -17,6 +17,7 @@ package androidx.media3.effect;
 
 import static androidx.media3.common.util.Assertions.checkNotNull;
 import static androidx.media3.common.util.Util.SDK_INT;
+import static java.lang.Math.ceil;
 
 import android.annotation.SuppressLint;
 import android.graphics.Bitmap;
@@ -87,7 +88,6 @@ public abstract class TextOverlay extends BitmapOverlay {
    */
   public abstract SpannableString getText(long presentationTimeUs);
 
-  @SuppressLint("InlinedApi") // Inlined Layout constants.
   @Override
   public Bitmap getBitmap(long presentationTimeUs) {
     SpannableString overlayText = getText(presentationTimeUs);
@@ -95,21 +95,8 @@ public abstract class TextOverlay extends BitmapOverlay {
       lastText = overlayText;
       TextPaint textPaint = new TextPaint();
       textPaint.setTextSize(TEXT_SIZE_PIXELS);
-      StaticLayout staticLayout;
-      int width = (int) textPaint.measureText(overlayText, /* start= */ 0, overlayText.length());
-      if (SDK_INT >= 23) {
-        staticLayout = Api23.getStaticLayout(overlayText, textPaint, width);
-      } else {
-        staticLayout =
-            new StaticLayout(
-                overlayText,
-                textPaint,
-                width,
-                Layout.Alignment.ALIGN_NORMAL,
-                Layout.DEFAULT_LINESPACING_MULTIPLIER,
-                Layout.DEFAULT_LINESPACING_ADDITION,
-                /* includepad= */ true);
-      }
+      StaticLayout staticLayout =
+          createStaticLayout(overlayText, textPaint, getSpannedTextWidth(overlayText, textPaint));
       lastBitmap =
           Bitmap.createBitmap(
               staticLayout.getWidth(), staticLayout.getHeight(), Bitmap.Config.ARGB_8888);
@@ -119,6 +106,33 @@ public abstract class TextOverlay extends BitmapOverlay {
     return checkNotNull(lastBitmap);
   }
 
+  private int getSpannedTextWidth(SpannableString text, TextPaint textPaint) {
+    // measureText doesn't take scaling spans into account so using a StaticLayout to measure
+    // the actual text width, then use a different StaticLayout to draw the text onto a Bitmap.
+    int measureTextWidth = (int) textPaint.measureText(text, /* start= */ 0, text.length());
+    StaticLayout widthMeasuringLayout = createStaticLayout(text, textPaint, measureTextWidth);
+    int lineCount = widthMeasuringLayout.getLineCount();
+    float realTextWidth = 0;
+    for (int i = 0; i < lineCount; i++) {
+      realTextWidth += widthMeasuringLayout.getLineWidth(i);
+    }
+    return (int) ceil(realTextWidth);
+  }
+
+  @SuppressLint("InlinedApi") // Inlined Layout constants.
+  private StaticLayout createStaticLayout(SpannableString text, TextPaint textPaint, int width) {
+    return SDK_INT >= 23
+        ? Api23.getStaticLayout(text, textPaint, width)
+        : new StaticLayout(
+            text,
+            textPaint,
+            width,
+            Layout.Alignment.ALIGN_NORMAL,
+            Layout.DEFAULT_LINESPACING_MULTIPLIER,
+            Layout.DEFAULT_LINESPACING_ADDITION,
+            /* includepad= */ true);
+  }
+
   @RequiresApi(23)
   private static final class Api23 {
     @DoNotInline