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/* Communication module for Android terminals. -*- c-file-style: "GNU" -*-
Copyright (C) 2023 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.Xfermode;
public final class EmacsCopyArea
{
private static Xfermode overAlu;
static
{
overAlu = new PorterDuffXfermode (Mode.SRC_OVER);
};
private static void
insetRectBy (Rect rect, int left, int top, int right,
int bottom)
{
rect.left += left;
rect.top += top;
rect.right -= right;
rect.bottom -= bottom;
}
public static void
perform (EmacsDrawable source, EmacsGC gc,
EmacsDrawable destination,
int src_x, int src_y, int width, int height,
int dest_x, int dest_y)
{
int i;
Bitmap bitmap;
Paint maskPaint, paint;
Canvas maskCanvas, canvas;
Bitmap srcBitmap, maskBitmap, clipBitmap;
Rect rect, maskRect, srcRect, dstRect, maskDestRect;
boolean needFill;
/* TODO implement stippling. */
if (gc.fill_style == EmacsGC.GC_FILL_OPAQUE_STIPPLED)
return;
paint = gc.gcPaint;
canvas = destination.lockCanvas (gc);
if (canvas == null)
return;
/* A copy must be created or drawBitmap could end up overwriting
itself. */
srcBitmap = source.getBitmap ();
/* If srcBitmap is out of bounds, then adjust the source rectangle
to be within bounds. Note that tiling on windows with
backgrounds is unimplemented. */
if (src_x < 0)
{
width += src_x;
dest_x -= src_x;
src_x = 0;
}
if (src_y < 0)
{
height += src_y;
dest_y -= src_y;
src_y = 0;
}
if (src_x + width > srcBitmap.getWidth ())
width = srcBitmap.getWidth () - src_x;
if (src_y + height > srcBitmap.getHeight ())
height = srcBitmap.getHeight () - src_y;
/* If width and height are empty or negative, then skip the entire
CopyArea operation lest createBitmap throw an exception. */
if (width <= 0 || height <= 0)
return;
rect = new Rect (dest_x, dest_y, dest_x + width,
dest_y + height);
if (gc.clip_mask == null)
{
if (source == destination)
{
/* Create a copy of the bitmap, since Android can't handle
overlapping copies. */
bitmap = Bitmap.createBitmap (srcBitmap,
src_x, src_y, width,
height);
canvas.drawBitmap (bitmap, null, rect, paint);
bitmap.recycle ();
}
else
{
/* But here the bitmaps are known to not overlap, so avoid
that extra consing overhead. */
srcRect = new Rect (src_x, src_y, src_x + width,
src_y + height);
canvas.drawBitmap (srcBitmap, srcRect, rect, 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 (dest_x, dest_y,
dest_x + width,
dest_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 ()));
clipBitmap = gc.clip_mask.bitmap;
if (!maskRect.setIntersect (dstRect, maskRect))
/* There is no intersection between the clip mask and the
dest rect. */
return;
/* Now figure out which part of the source corresponds to
maskRect and return it relative to srcBitmap. */
srcRect = new Rect (src_x, src_y, src_x + width,
src_y + height);
insetRectBy (srcRect, maskRect.left - dstRect.left,
maskRect.top - dstRect.top,
maskRect.right - dstRect.right,
maskRect.bottom - dstRect.bottom);
/* 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);
maskPaint = new Paint ();
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 ()),
maskPaint);
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.setXfermode (EmacsGC.srcInAlu);
/* Draw the source. */
maskDestRect = new Rect (0, 0, srcRect.width (),
srcRect.height ());
maskCanvas.drawBitmap (srcBitmap, srcRect, maskDestRect,
maskPaint);
/* Finally, draw the mask bitmap to the destination. */
paint.setXfermode (overAlu);
canvas.drawBitmap (maskBitmap, null, maskRect, paint);
gc.resetXfermode ();
/* Recycle this unused bitmap. */
maskBitmap.recycle ();
}
destination.damageRect (rect);
}
}
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