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Small cleanup for keyboard drawing code 

Change-Id: I8b562e03b30f82dddae311b49d316402e867cd31
main
Tadashi G. Takaoka 2012-08-02 15:10:59 +09:00
parent fb955693d4
commit 8344259fc9
1 changed files with 46 additions and 35 deletions
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81
java/src/com/android/inputmethod/keyboard/KeyboardView.java
View File

@ -25,7 +25,7 @@ import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.Region.Op;
import android.graphics.Region;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.Message;
@ -120,12 +120,12 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
private boolean mInvalidateAllKeys;
/** The keys that should be drawn */
private final HashSet<Key> mInvalidatedKeys = new HashSet<Key>();
/** The region of invalidated keys */
private final Rect mInvalidatedKeysRect = new Rect();
/** The working rectangle variable */
private final Rect mWorkingRect = new Rect();
/** The keyboard bitmap buffer for faster updates */
private Bitmap mBuffer;
private Bitmap mOffscreenBuffer;
/** The canvas for the above mutable keyboard bitmap */
private Canvas mCanvas;
private Canvas mOffscreenCanvas;
private final Paint mPaint = new Paint();
private final Paint.FontMetrics mFontMetrics = new Paint.FontMetrics();
// This sparse array caches key label text height in pixel indexed by key label text size.
@ -457,46 +457,61 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mBufferNeedsUpdate || mBuffer == null) {
if (mBufferNeedsUpdate || mOffscreenBuffer == null) {
mBufferNeedsUpdate = false;
onBufferDraw();
if (maybeAllocateOffscreenBuffer()) {
mInvalidateAllKeys = true;
if (mOffscreenCanvas != null) {
mOffscreenCanvas.setBitmap(mOffscreenBuffer);
} else {
mOffscreenCanvas = new Canvas(mOffscreenBuffer);
}
}
onDrawKeyboard(mOffscreenCanvas);
}
canvas.drawBitmap(mBuffer, 0, 0, null);
canvas.drawBitmap(mOffscreenBuffer, 0, 0, null);
}
private void onBufferDraw() {
private boolean maybeAllocateOffscreenBuffer() {
final int width = getWidth();
final int height = getHeight();
if (width == 0 || height == 0)
return;
if (mBuffer == null || mBuffer.getWidth() != width || mBuffer.getHeight() != height) {
if (mBuffer != null)
mBuffer.recycle();
mBuffer = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mInvalidateAllKeys = true;
if (mCanvas != null) {
mCanvas.setBitmap(mBuffer);
} else {
mCanvas = new Canvas(mBuffer);
}
if (width == 0 || height == 0) {
return false;
}
if (mOffscreenBuffer != null && mOffscreenBuffer.getWidth() == width
&& mOffscreenBuffer.getHeight() == height) {
return false;
}
freeOffscreenBuffer();
mOffscreenBuffer = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
return true;
}
private void freeOffscreenBuffer() {
if (mOffscreenBuffer != null) {
mOffscreenBuffer.recycle();
mOffscreenBuffer = null;
}
}
private void onDrawKeyboard(final Canvas canvas) {
if (mKeyboard == null) return;
final Canvas canvas = mCanvas;
final int width = getWidth();
final int height = getHeight();
final Paint paint = mPaint;
final KeyDrawParams params = mKeyDrawParams;
if (mInvalidateAllKeys || mInvalidatedKeys.isEmpty()) {
mInvalidatedKeysRect.set(0, 0, width, height);
canvas.clipRect(mInvalidatedKeysRect, Op.REPLACE);
mWorkingRect.set(0, 0, width, height);
canvas.clipRect(mWorkingRect, Region.Op.REPLACE);
canvas.drawColor(Color.BLACK, PorterDuff.Mode.CLEAR);
// Draw all keys.
for (final Key key : mKeyboard.mKeys) {
onDrawKey(key, canvas, paint, params);
}
if (mNeedsToDimEntireKeyboard) {
drawDimRectangle(canvas, mInvalidatedKeysRect, mBackgroundDimAlpha, paint);
drawDimRectangle(canvas, mWorkingRect, mBackgroundDimAlpha, paint);
}
} else {
// Draw invalidated keys.
@ -506,12 +521,12 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
}
final int x = key.mX + getPaddingLeft();
final int y = key.mY + getPaddingTop();
mInvalidatedKeysRect.set(x, y, x + key.mWidth, y + key.mHeight);
canvas.clipRect(mInvalidatedKeysRect, Op.REPLACE);
mWorkingRect.set(x, y, x + key.mWidth, y + key.mHeight);
canvas.clipRect(mWorkingRect, Region.Op.REPLACE);
canvas.drawColor(Color.BLACK, PorterDuff.Mode.CLEAR);
onDrawKey(key, canvas, paint, params);
if (mNeedsToDimEntireKeyboard) {
drawDimRectangle(canvas, mInvalidatedKeysRect, mBackgroundDimAlpha, paint);
drawDimRectangle(canvas, mWorkingRect, mBackgroundDimAlpha, paint);
}
}
}
@ -524,7 +539,6 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
}
mInvalidatedKeys.clear();
mInvalidatedKeysRect.setEmpty();
mInvalidateAllKeys = false;
}
@ -1026,9 +1040,9 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
mInvalidatedKeys.add(key);
final int x = key.mX + getPaddingLeft();
final int y = key.mY + getPaddingTop();
mInvalidatedKeysRect.union(x, y, x + key.mWidth, y + key.mHeight);
mWorkingRect.set(x, y, x + key.mWidth, y + key.mHeight);
mBufferNeedsUpdate = true;
invalidate(mInvalidatedKeysRect);
invalidate(mWorkingRect);
}
public void closing() {
@ -1054,9 +1068,6 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
super.onDetachedFromWindow();
closing();
mPreviewPlacerView.removeAllViews();
if (mBuffer != null) {
mBuffer.recycle();
mBuffer = null;
}
freeOffscreenBuffer();
}
}