android/src/org/rockbox/RockboxFramebuffer.java

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 Thomas Martitz
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 package org.rockbox;
  23
  24 import java.nio.ByteBuffer;
  25
  26 import android.content.Context;
  27 import android.graphics.Bitmap;
  28 import android.graphics.Canvas;
  29 import android.graphics.Rect;
  30 import android.util.DisplayMetrics;
  31 import android.view.KeyEvent;
  32 import android.view.MotionEvent;
  33 import android.view.SurfaceHolder;
  34 import android.view.SurfaceView;
  35 import android.view.ViewConfiguration;
  36
  37 public class RockboxFramebuffer extends SurfaceView
  38                                  implements SurfaceHolder.Callback
  39 {
  40     private final DisplayMetrics metrics;
  41     private final ViewConfiguration view_config;
  42     private ByteBuffer native_buf;
  43     private Bitmap btm;
  44
  45     /* first stage init; needs to run from a thread that has a Looper
  46      * setup stuff that needs a Context */
  47     public RockboxFramebuffer(Context c)
  48     {
  49         super(c);
  50
  51         metrics = c.getResources().getDisplayMetrics();
  52         view_config = ViewConfiguration.get(c);
  53         getHolder().addCallback(this);
  54         /* Needed so we can catch KeyEvents */
  55         setFocusable(true);
  56         setFocusableInTouchMode(true);
  57         setClickable(true);
  58         /* don't draw until native is ready (2nd stage) */
  59         setEnabled(false);
  60     }
  61
  62     /* second stage init; called from Rockbox with information about the
  63      * display framebuffer */
  64     private void java_lcd_init(int lcd_width, int lcd_height, ByteBuffer native_fb)
  65     {
  66         btm = Bitmap.createBitmap(lcd_width, lcd_height, Bitmap.Config.RGB_565);
  67         native_buf = native_fb;
  68         setEnabled(true);
  69     }
  70
  71     private void java_lcd_update()
  72     {
  73         SurfaceHolder holder = getHolder();
  74         Canvas c = holder.lockCanvas(null);
  75         btm.copyPixelsFromBuffer(native_buf);
  76         synchronized (holder)
  77         { /* draw */
  78             c.drawBitmap(btm, 0.0f, 0.0f, null);
  79         }
  80         holder.unlockCanvasAndPost(c);
  81     }
  82
  83     private void java_lcd_update_rect(int x, int y, int width, int height)
  84     {
  85         SurfaceHolder holder = getHolder();
  86         Rect dirty = new Rect(x, y, x+width, y+height);
  87         Canvas c = holder.lockCanvas(dirty);
  88         /* can't copy a partial buffer,
  89          * but it doesn't make a noticeable difference anyway */
  90         btm.copyPixelsFromBuffer(native_buf);
  91         synchronized (holder)
  92         {   /* draw */
  93             c.drawBitmap(btm, dirty, dirty, null);
  94         }
  95         holder.unlockCanvasAndPost(c);
  96     }
  97
  98     public boolean onTouchEvent(MotionEvent me)
  99     {
 100         int x = (int) me.getX();
 101         int y = (int) me.getY();
 102
 103         switch (me.getAction())
 104         {
 105         case MotionEvent.ACTION_CANCEL:
 106         case MotionEvent.ACTION_UP:
 107             touchHandler(false, x, y);
 108             return true;
 109         case MotionEvent.ACTION_MOVE:
 110         case MotionEvent.ACTION_DOWN:
 111             touchHandler(true, x, y);
 112             return true;
 113         }
 114
 115         return false;
 116     }
 117
 118     public boolean onKeyDown(int keyCode, KeyEvent event)
 119     {
 120         return buttonHandler(keyCode, true);
 121     }
 122
 123     public boolean onKeyUp(int keyCode, KeyEvent event)
 124     {
 125         return buttonHandler(keyCode, false);
 126     }
 127
 128     private int getDpi()
 129     {
 130         return metrics.densityDpi;
 131     }
 132
 133
 134     private int getScrollThreshold()
 135     {
 136         return view_config.getScaledTouchSlop();
 137     }
 138
 139     private native void touchHandler(boolean down, int x, int y);
 140     public native static boolean buttonHandler(int keycode, boolean state);
 141
 142     public native void surfaceCreated(SurfaceHolder holder);
 143     public native void surfaceDestroyed(SurfaceHolder holder);
 144     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
 145     {
 146     }
 147 }