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Simplify bitmap reallocation on Android

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* java/org/gnu/emacs/EmacsView.java: Update outdated commentary.
(handleDirtyBitmap): Don't copy contents of the previous bitmap
to the new.
(onLayout): Unconditionally expose upon layout changes.
This commit is contained in:
Po Lu 2024-06-16 11:35:44 +08:00
parent 3241d6cfbf
commit 8d60b6bab8
1 changed files with 17 additions and 18 deletions
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35
java/org/gnu/emacs/EmacsView.java
View file

@ -49,11 +49,13 @@ import java.util.Arrays;
/* This is an Android view which has a back and front buffer. When
swapBuffers is called, the back buffer is swapped to the front
buffer, and any damage is invalidated. frontBitmap and backBitmap
are modified and used both from the UI and the Emacs thread. As a
result, there is a lock held during all drawing operations.
buffer, and any damage is invalidated. A front buffer bitmap defined
in EmacsSurfaceView, and the write buffer in this file, are modified
and used both from the UI and the Emacs thread. As a result, there
is a lock held during all drawing operations.
It is also a ViewGroup, as it also lays out children. */
It is also a ViewGroup, so that it may also manage the layout of its
children. */
public final class EmacsView extends ViewGroup
implements ViewTreeObserver.OnGlobalLayoutListener
@ -204,19 +206,19 @@ public final class EmacsView extends ViewGroup
rectangle ID. */
lastClipSerial = 0;
/* Copy over the contents of the old bitmap. */
if (oldBitmap != null)
canvas.drawBitmap (oldBitmap, 0f, 0f, new Paint ());
/* Clear the bitmap reallocation flag. */
bitmapDirty = false;
/* Explicitly free the old bitmap's memory. */
/* Explicitly free the old bitmap's memory. The bitmap might
continue to be referenced by canvas or JNI objects returned by
getBitmap or getCanvas, but the underlying storage will not be
released until such references disappear. See
BitmapWrapper::freePixels in hwui/jni/Bitmap.cpp. */
if (oldBitmap != null)
oldBitmap.recycle ();
/* Some Android versions still don't free the bitmap until the
next GC. */
/* Some Android versions still refuse to release the bitmap until
the next GC. */
Runtime.getRuntime ().gc ();
}
@ -367,13 +369,10 @@ public final class EmacsView extends ViewGroup
if (changed)
{
/* Expose the window upon a change in the view's size that
prompts the creation of a new bitmap. */
explicitlyDirtyBitmap ();
/* Expose the window upon a change in the view's size. */
if (right - left > oldMeasuredWidth
|| bottom - top > oldMeasuredHeight)
needExpose = true;
needExpose = true;
/* This might return NULL if this view is not attached. */
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R)