SimpleStringTexture.java revision f99dfe8549fb6c2c06c8cb7ca7d5eb33002c809e 
1package com.cooliris.media;
2
3import android.graphics.Bitmap;
4import android.graphics.Canvas;
5import android.graphics.Color;
6import android.graphics.Paint;
7import android.graphics.Rect;
8import android.graphics.Typeface;
9
10public final class SimpleStringTexture extends Texture {
11
12    private final String mString;
13    private final StringTexture.Config mConfig;
14    private float mBaselineHeight = 0.0f;
15
16    SimpleStringTexture(String string, StringTexture.Config config) {
17        mString = string;
18        mConfig = config;
19    }
20
21    public float getBaselineHeight() {
22        return mBaselineHeight;
23    }
24
25    @Override
26    public boolean isCached() {
27        return true;
28    }
29
30    @Override
31    protected Bitmap load(RenderView view) {
32        // Configure paint.
33        StringTexture.Config config = mConfig;
34        Paint paint = new Paint();
35        paint.setAntiAlias(true);
36        paint.setColor(Shared.argb(config.a, config.r, config.g, config.b));
37        paint.setShadowLayer(config.shadowRadius, 0f, 0f, Color.BLACK);
38        paint.setTypeface(config.bold ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT);
39        paint.setTextSize(config.fontSize);
40        paint.setUnderlineText(config.underline);
41        paint.setStrikeThruText(config.strikeThrough);
42        if (config.italic) {
43            paint.setTextSkewX(-0.25f);
44        }
45
46        // Measure string.
47        String string = mString;
48        Rect bounds = new Rect();
49        paint.getTextBounds(string, 0, string.length(), bounds);
50
51        // Get font metrics.
52        Paint.FontMetricsInt metrics = paint.getFontMetricsInt();
53        int height = metrics.bottom - metrics.top;
54
55        // Draw string into bitmap with a 1px margin for anti-aliasing.
56        // Ensure baseline alignment with other strings of the same size.
57        int padding = 1 + config.shadowRadius;
58        Bitmap bitmap = Bitmap
59                .createBitmap(bounds.width() + padding + padding, height + padding + padding, Bitmap.Config.ARGB_8888);
60        Canvas canvas = new Canvas(bitmap);
61        canvas.translate(padding, padding - metrics.ascent);
62        canvas.drawText(string, 0, 0, paint);
63
64        mBaselineHeight = padding + metrics.bottom;
65
66        return bitmap;
67    }
68
69}
70