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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.cooliris.media;
     18 
     19 import android.graphics.Bitmap;
     20 import android.graphics.Canvas;
     21 import android.graphics.Color;
     22 import android.graphics.Paint;
     23 import android.graphics.Rect;
     24 import android.graphics.Typeface;
     25 
     26 public final class SimpleStringTexture extends Texture {
     27 
     28     private final String mString;
     29     private final StringTexture.Config mConfig;
     30     private float mBaselineHeight = 0.0f;
     31 
     32     SimpleStringTexture(String string, StringTexture.Config config) {
     33         mString = string;
     34         mConfig = config;
     35     }
     36 
     37     public float getBaselineHeight() {
     38         return mBaselineHeight;
     39     }
     40 
     41     @Override
     42     public boolean isCached() {
     43         return true;
     44     }
     45 
     46     @Override
     47     protected Bitmap load(RenderView view) {
     48         // Configure paint.
     49         StringTexture.Config config = mConfig;
     50         Paint paint = new Paint();
     51         paint.setAntiAlias(true);
     52         paint.setColor(Shared.argb(config.a, config.r, config.g, config.b));
     53         paint.setShadowLayer(config.shadowRadius, 0f, 0f, Color.BLACK);
     54         paint.setTypeface(config.bold ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT);
     55         paint.setTextSize(config.fontSize);
     56         paint.setUnderlineText(config.underline);
     57         paint.setStrikeThruText(config.strikeThrough);
     58         if (config.italic) {
     59             paint.setTextSkewX(-0.25f);
     60         }
     61 
     62         // Measure string.
     63         String string = mString;
     64         Rect bounds = new Rect();
     65         paint.getTextBounds(string, 0, string.length(), bounds);
     66 
     67         // Get font metrics.
     68         Paint.FontMetricsInt metrics = paint.getFontMetricsInt();
     69         int height = metrics.bottom - metrics.top;
     70 
     71         // Draw string into bitmap with a 1px margin for anti-aliasing.
     72         // Ensure baseline alignment with other strings of the same size.
     73         int padding = 1 + config.shadowRadius;
     74         Bitmap bitmap = Bitmap
     75                 .createBitmap(bounds.width() + padding + padding, height + padding + padding, Bitmap.Config.ARGB_8888);
     76         Canvas canvas = new Canvas(bitmap);
     77         canvas.translate(padding, padding - metrics.ascent);
     78         canvas.drawText(string, 0, 0, paint);
     79 
     80         mBaselineHeight = padding + metrics.bottom;
     81 
     82         return bitmap;
     83     }
     84 
     85 }
     86