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/* Communication module for Android terminals. -*- c-file-style: "GNU" -*-
Copyright (C) 2023-2024 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
package org.gnu.emacs;
import java.lang.IllegalArgumentException;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.os.Build;
/* Drawable backed by bitmap. */
public final class EmacsPixmap extends EmacsHandleObject
implements EmacsDrawable
{
/* The depth of the bitmap. This is not actually used, just defined
in order to be consistent with X. */
public final int depth, width, height;
/* The bitmap itself. */
public Bitmap bitmap;
/* The canvas used to draw to BITMAP. */
public Canvas canvas;
/* Whether or not GC should be explicitly triggered upon
release. */
private final boolean needCollect;
/* ID used to determine whether or not the GC clip rects
changed. */
private long gcClipRectID;
public
EmacsPixmap (short handle, int width, int height, int depth)
{
super (handle);
if (depth != 1 && depth != 24)
throw new IllegalArgumentException ("Invalid depth specified"
+ " for pixmap: " + depth);
switch (depth)
{
case 1:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
bitmap = Bitmap.createBitmap (width, height,
Bitmap.Config.ALPHA_8,
false);
else
bitmap = Bitmap.createBitmap (width, height,
Bitmap.Config.ALPHA_8);
break;
case 24:
/* Emacs doesn't just use the first kind of `createBitmap'
because the latter allows specifying that the pixmap is
always opaque, which really increases efficiency. */
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O)
bitmap = Bitmap.createBitmap (width, height,
Bitmap.Config.ARGB_8888);
else
bitmap = Bitmap.createBitmap (width, height,
Bitmap.Config.ARGB_8888,
false);
break;
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1)
/* On these old versions of Android, Bitmap.recycle frees bitmap
contents immediately. */
needCollect = false;
else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT)
needCollect = (bitmap.getByteCount ()
>= 1024 * 512);
else
needCollect = (bitmap.getAllocationByteCount ()
>= 1024 * 512);
bitmap.eraseColor (0xff000000);
this.width = width;
this.height = height;
this.depth = depth;
}
@Override
public Canvas
lockCanvas (EmacsGC gc)
{
int i;
if (canvas == null)
{
canvas = new Canvas (bitmap);
canvas.save ();
}
/* Now see if clipping has to be redone. */
if (gc.clipRectID == gcClipRectID)
return canvas;
/* It does have to be redone. Reapply gc.real_clip_rects. */
canvas.restore ();
canvas.save ();
if (gc.real_clip_rects != null)
{
for (i = 0; i < gc.real_clip_rects.length; ++i)
canvas.clipRect (gc.real_clip_rects[i]);
}
/* Save the clip rect ID again. */
gcClipRectID = gc.clipRectID;
return canvas;
}
@Override
public void
damageRect (Rect damageRect)
{
}
@Override
public void
damageRect (int left, int top, int right, int bottom)
{
}
@Override
public Bitmap
getBitmap ()
{
return bitmap;
}
@Override
public void
destroyHandle ()
{
bitmap.recycle ();
bitmap = null;
/* Collect the bitmap storage if the bitmap is big. */
if (needCollect)
Runtime.getRuntime ().gc ();
}
};
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