664140fc26
* java/org/gnu/emacs/EmacsSurfaceView.java (reconfigureFrontBuffer): Don't use function only present on Android 8.0 and later.
139 lines
3.6 KiB
Java
139 lines
3.6 KiB
Java
/* Communication module for Android terminals. -*- c-file-style: "GNU" -*-
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
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package org.gnu.emacs;
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import android.view.View;
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import android.os.Build;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Rect;
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import android.graphics.Paint;
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/* This originally extended SurfaceView. However, doing so proved to
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be too slow, and Android's surface view keeps up to three of its
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own back buffers, which use too much memory (up to 96 MB for a
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single frame.) */
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public class EmacsSurfaceView extends View
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{
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private static final String TAG = "EmacsSurfaceView";
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private EmacsView view;
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private Bitmap frontBuffer;
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private Canvas bitmapCanvas;
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private Bitmap bitmap;
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private Paint bitmapPaint;
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public
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EmacsSurfaceView (final EmacsView view)
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{
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super (view.getContext ());
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this.view = view;
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this.bitmapPaint = new Paint ();
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}
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private void
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copyToFrontBuffer (Rect damageRect)
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{
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if (damageRect != null)
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bitmapCanvas.drawBitmap (bitmap, damageRect, damageRect,
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bitmapPaint);
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else
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bitmapCanvas.drawBitmap (bitmap, 0f, 0f, bitmapPaint);
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}
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private void
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reconfigureFrontBuffer (Bitmap bitmap)
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{
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/* First, remove the old front buffer. */
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if (frontBuffer != null)
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{
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frontBuffer.recycle ();
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frontBuffer = null;
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bitmapCanvas = null;
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}
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this.bitmap = bitmap;
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/* Next, create the new front buffer if necessary. */
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if (bitmap != null && frontBuffer == null)
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{
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
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frontBuffer = Bitmap.createBitmap (bitmap.getWidth (),
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bitmap.getHeight (),
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Bitmap.Config.ARGB_8888,
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false);
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else
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frontBuffer = Bitmap.createBitmap (bitmap.getWidth (),
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bitmap.getHeight (),
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Bitmap.Config.ARGB_8888);
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bitmapCanvas = new Canvas (frontBuffer);
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/* And copy over the bitmap contents. */
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copyToFrontBuffer (null);
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}
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else if (bitmap != null)
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/* Just copy over the bitmap contents. */
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copyToFrontBuffer (null);
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}
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public synchronized void
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setBitmap (Bitmap bitmap, Rect damageRect)
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{
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if (bitmap != this.bitmap)
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reconfigureFrontBuffer (bitmap);
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else if (bitmap != null)
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copyToFrontBuffer (damageRect);
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if (bitmap != null)
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{
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/* In newer versions of Android, the invalid rectangle is
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supposedly internally calculated by the system. How that
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is done is unknown, but calling `invalidateRect' is now
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deprecated.
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Fortunately, nobody has deprecated the version of
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`postInvalidate' that accepts a dirty rectangle. */
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if (damageRect != null)
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postInvalidate (damageRect.left, damageRect.top,
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damageRect.right, damageRect.bottom);
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else
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postInvalidate ();
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}
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}
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@Override
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public synchronized void
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onDraw (Canvas canvas)
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{
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/* Paint the view's bitmap; the bitmap might be recycled right
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now. */
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if (frontBuffer != null)
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canvas.drawBitmap (frontBuffer, 0f, 0f, bitmapPaint);
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}
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};
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