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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 android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Xfermode;
import android.util.Log;
public final class EmacsDrawRectangle
{
private static final Xfermode srcInAlu;
static
{
srcInAlu = new PorterDuffXfermode (Mode.SRC_IN);
};
public static void
perform (EmacsDrawable drawable, EmacsGC gc,
int x, int y, int width, int height)
{
Paint maskPaint, paint;
Canvas maskCanvas;
Bitmap maskBitmap;
Rect maskRect, dstRect;
Canvas canvas;
Bitmap clipBitmap;
/* TODO implement stippling for this request. */
if (gc.fill_style == EmacsGC.GC_FILL_OPAQUE_STIPPLED
/* And GC_INVERT also. */
|| gc.fill_style == EmacsGC.GC_INVERT)
return;
canvas = drawable.lockCanvas (gc);
if (canvas == null)
return;
paint = gc.gcPaint;
paint.setStyle (Paint.Style.STROKE);
/* This graphics request, in contrast to X, does not presently
respect the GC's line style. */
if (gc.clip_mask == null)
/* Use canvas.drawRect with a RectF. That seems to reliably
get PostScript behavior. */
canvas.drawRect (new RectF (x + 0.5f, y + 0.5f,
x + width + 0.5f,
y + height + 0.5f),
paint);
else
{
/* Drawing with a clip mask involves calculating the
intersection of the clip mask with the dst rect, and
extrapolating the corresponding part of the src rect. */
clipBitmap = gc.clip_mask.bitmap;
dstRect = new Rect (x, y, x + width, y + height);
maskRect = new Rect (gc.clip_x_origin,
gc.clip_y_origin,
(gc.clip_x_origin
+ clipBitmap.getWidth ()),
(gc.clip_y_origin
+ clipBitmap.getHeight ()));
if (!maskRect.setIntersect (dstRect, maskRect))
/* There is no intersection between the clip mask and the
dest rect. */
return;
/* Finally, create a temporary bitmap that is the size of
maskRect. */
maskBitmap
= Bitmap.createBitmap (maskRect.width (), maskRect.height (),
Bitmap.Config.ARGB_8888);
/* Draw the mask onto the maskBitmap. */
maskCanvas = new Canvas (maskBitmap);
maskRect.offset (-gc.clip_x_origin,
-gc.clip_y_origin);
maskCanvas.drawBitmap (gc.clip_mask.bitmap,
maskRect, new Rect (0, 0,
maskRect.width (),
maskRect.height ()),
paint);
maskRect.offset (gc.clip_x_origin,
gc.clip_y_origin);
/* Set the transfer mode to SRC_IN to preserve only the parts
of the source that overlap with the mask. */
maskPaint = new Paint ();
maskPaint.setXfermode (srcInAlu);
maskPaint.setStyle (Paint.Style.STROKE);
/* Draw the source. */
maskCanvas.drawRect (maskRect, maskPaint);
/* Finally, draw the mask bitmap to the destination. */
paint.setXfermode (null);
canvas.drawBitmap (maskBitmap, null, maskRect, paint);
/* Recycle this unused bitmap. */
maskBitmap.recycle ();
}
drawable.damageRect (x, y, x + width + 1, y + height + 1);
}
}
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