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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.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
public final class EmacsDrawLine
{
public static void
perform (EmacsDrawable drawable, EmacsGC gc,
int x, int y, int x2, int y2)
{
Canvas canvas;
Paint paint;
int x0, x1, y0, y1;
/* TODO implement stippling. */
if (gc.fill_style == EmacsGC.GC_FILL_OPAQUE_STIPPLED)
return;
/* Calculate the leftmost and rightmost points. */
x0 = Math.min (x, x2 + 1);
x1 = Math.max (x, x2 + 1);
y0 = Math.min (y, y2 + 1);
y1 = Math.max (y, y2 + 1);
/* And the clip rectangle. */
paint = gc.gcPaint;
canvas = drawable.lockCanvas (gc);
if (canvas == null)
return;
paint.setStyle (Paint.Style.FILL);
/* Since drawLine has PostScript style behavior, adjust the
coordinates appropriately.
The left most pixel of a straight line is always partially
filled. Patch it in manually. */
if (gc.clip_mask == null)
{
canvas.drawLine ((float) x + 0.5f, (float) y + 0.5f,
(float) x2 + 0.5f, (float) y2 + 0.5f,
paint);
if (x2 > x)
canvas.drawRect (new Rect (x, y, x + 1, y + 1), paint);
}
/* DrawLine with clip mask not implemented; it is not used by
Emacs. */
drawable.damageRect (x0, y0, x1, y1);
}
}
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