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package com.mapbox.mapboxsdk.text;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Bitmap;
import android.graphics.PorterDuff;
import android.graphics.Typeface;
import androidx.annotation.Keep;
import androidx.annotation.NonNull;
import androidx.annotation.WorkerThread;
/**
* LocalGlyphRasterizer is the Android-specific platform implementation used
* by the portable local_glyph_rasterizer.hpp
*/
public class LocalGlyphRasterizer {
private final Bitmap bitmap;
@NonNull
private final Paint paint;
@NonNull
private final Canvas canvas;
LocalGlyphRasterizer() {
/*
35x35px dimensions are hardwired to match local_glyph_rasterizer.cpp
These dimensions are large enough to draw a 24 point character in the middle
of the bitmap (y: 20) with some buffer around the edge
*/
bitmap = Bitmap.createBitmap(35, 35, Bitmap.Config.ARGB_8888);
paint = new Paint();
paint.setAntiAlias(true);
paint.setTextSize(24);
canvas = new Canvas();
canvas.setBitmap(bitmap);
}
/***
* Uses Android-native drawing code to rasterize a single glyph
* to a square {@link Bitmap} which can be returned to portable
* code for transformation into a Signed Distance Field glyph.
*
* @param fontFamily Font family string to pass to Typeface.create
* @param bold If true, use Typeface.BOLD option
* @param glyphID 16-bit Unicode BMP codepoint to draw
*
* @return Return a {@link Bitmap} to be displayed in the requested tile.
*/
@WorkerThread
@Keep
protected Bitmap drawGlyphBitmap(String fontFamily, boolean bold, char glyphID) {
paint.setTypeface(Typeface.create(fontFamily, bold ? Typeface.BOLD : Typeface.NORMAL));
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
canvas.drawText(String.valueOf(glyphID), 0, 20, paint);
return bitmap;
}
}
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