private void computeCoverAndKeepRect(final Rect visibleRect, Rect coverRect, Rect keepRect) {
visibleRect.copyTo(coverRect);
visibleRect.copyTo(keepRect);
// If we cover more that the actual viewport we can be smart about which tiles we choose to
// render.
if (mCoverAreaMultiplier > 1) {
// The initial cover area covers equally in each direction, according to the
// coverAreaMultiplier.
coverRect.inflate(
(int) (visibleRect.getWidth() * (mCoverAreaMultiplier - 1) / 2),
(int) (visibleRect.getHeight() * (mCoverAreaMultiplier - 1) / 2));
coverRect.copyTo(keepRect);
if (mPendingTrajectoryVector.getX() != 0 || mPendingTrajectoryVector.getY() != 0) {
// A null trajectory vector (no motion) means that tiles for the coverArea will be created.
// A non-null trajectory vector will shrink the covered rect to visibleRect plus its
// expansion from its
// center toward the cover area edges in the direction of the given vector.
// E.g. if visibleRect == (10,10)5x5 and coverAreaMultiplier == 3.0:
// a (0,0) trajectory vector will create tiles intersecting (5,5)15x15,
// a (1,0) trajectory vector will create tiles intersecting (10,10)10x5,
// and a (1,1) trajectory vector will create tiles intersecting (10,10)10x10.
// Multiply the vector by the distance to the edge of the cover area.
float trajectoryVectorMultiplier = (mCoverAreaMultiplier - 1) / 2;
// Unite the visible rect with a "ghost" of the visible rect moved in the direction of the
// trajectory vector.
visibleRect.copyTo(coverRect);
coverRect.offset(
(int) (coverRect.getWidth() * mTrajectoryVector.getX() * trajectoryVectorMultiplier),
(int) (coverRect.getHeight() * mTrajectoryVector.getY() * trajectoryVectorMultiplier));
coverRect.composite(visibleRect);
}
assert (keepRect.contains(coverRect));
}
adjustForContentsRect(coverRect);
// The keep rect is an inflated version of the cover rect, inflated in tile dimensions.
keepRect.composite(coverRect);
keepRect.inflate(mTileSize.getWidth() / 2, mTileSize.getHeight() / 2);
keepRect.intersect(mRect);
assert (coverRect.isEmpty() || keepRect.contains(coverRect));
}
private boolean resizeEdgeTiles() {
boolean wasResized = false;
List<Coordinate> tilesToRemove = new ArrayList<Coordinate>();
Iterator<Entry<Coordinate, ITile>> it = mMainTiles.iterator();
while (it.hasNext()) {
Entry<Coordinate, ITile> entry = it.next();
Coordinate tileCoordinate = entry.getValue().coordinate();
Rect tileRect = entry.getValue().rect();
Rect expectedTileRect = tileRectForCoordinate(tileCoordinate);
if (expectedTileRect.isEmpty()) tilesToRemove.add(tileCoordinate);
else if (!expectedTileRect.equals(tileRect)) {
entry.getValue().resize(expectedTileRect.getWidth(), expectedTileRect.getHeight());
wasResized = true;
}
}
int removeCount = tilesToRemove.size();
for (int n = 0; n < removeCount; ++n) removeTile(tilesToRemove.get(n));
return wasResized;
}
private void adjustForContentsRect(Rect rect) {
Rect bounds = mRect;
Size candidateSize = new Size(rect.getWidth(), rect.getHeight());
rect.intersect(bounds);
if (rect.getWidth() == candidateSize.getWidth()
&& rect.getHeight() == candidateSize.getHeight()) return;
/*
* In the following case, there is no intersection of the contents rect and the cover rect.
* Thus the latter should not be inflated.
*
* +---------------+
* | m_rect |
* +---------------+
*
* +-------------------------------+
* | cover rect |
* | +---------+ |
* | | visible | |
* | | rect | |
* | +---------+ |
* +-------------------------------+
*/
if (rect.isEmpty()) return;
// Try to create a cover rect of the same size as the candidate, but within content bounds.
int pixelsCovered = candidateSize.getWidth() * candidateSize.getHeight();
if (rect.getWidth() < candidateSize.getWidth())
rect.inflate(0, ((pixelsCovered / rect.getWidth()) - rect.getHeight()) / 2);
if (rect.getHeight() < candidateSize.getHeight())
rect.inflate(((pixelsCovered / rect.getHeight()) - rect.getWidth()) / 2, 0);
rect.intersect(bounds);
}
private void createTiles(BSTimerTask task) {
// Guard here as as these can change before the timer fires.
if (isBackingStoreUpdatesSuspended()) return;
// Update our backing store geometry.
final Rect previousRect = mRect.clone();
mapFromContents(mClient.tbsGetContentsRect()).copyTo(mRect);
mPendingTrajectoryVector.copyTo(mTrajectoryVector);
visibleRect().copyTo(mVisibleRect);
if (mRect.isEmpty()) {
setCoverRect(new Rect());
setKeepRect(new Rect());
return;
}
/* We must compute cover and keep rects using the visibleRect, instead of the rect intersecting the visibleRect with m_rect,
* because TBS can be used as a backing store of GraphicsLayer and the visible rect usually does not intersect with m_rect.
* In the below case, the intersecting rect is an empty.
*
* +---------------+
* | |
* | m_rect |
* | +-------|-----------------------+
* | | HERE | cover or keep |
* +---------------+ rect |
* | +---------+ |
* | | visible | |
* | | rect | |
* | +---------+ |
* | |
* | |
* +-------------------------------+
*
* We must create or keep the tiles in the HERE region.
*/
Rect coverRect = new Rect();
Rect keepRect = new Rect();
computeCoverAndKeepRect(mVisibleRect, coverRect, keepRect);
setCoverRect(coverRect);
setKeepRect(keepRect);
if (coverRect.isEmpty()) return;
// Resize tiles at the edge in case the contents size has changed, but only do so
// after having dropped tiles outside the keep rect.
boolean didResizeTiles = false;
if (!previousRect.equals(mRect)) didResizeTiles = resizeEdgeTiles();
// Search for the tile position closest to the viewport center that does not yet contain a tile.
// Which position is considered the closest depends on the tileDistance function.
double shortestDistance = Double.POSITIVE_INFINITY;
List<Coordinate> tilesToCreate = new ArrayList<Coordinate>();
int requiredTileCount = 0;
// Cover areas (in tiles) with minimum distance from the visible rect. If the visible rect is
// not covered already it will be covered first in one go, due to the distance being 0 for tiles
// inside the visible rect.
Coordinate topLeft = tileCoordinateForPoint(coverRect.getLeft(), coverRect.getTop());
Coordinate bottomRight = tileCoordinateForPoint(coverRect.getRight(), coverRect.getBottom());
for (int yCoordinate = topLeft.getY(); yCoordinate <= bottomRight.getY(); ++yCoordinate) {
for (int xCoordinate = topLeft.getX(); xCoordinate <= bottomRight.getX(); ++xCoordinate) {
if (getTileAt(xCoordinate, yCoordinate) != null) continue;
++requiredTileCount;
double distance = tileDistance(mVisibleRect, xCoordinate, yCoordinate);
if (distance > shortestDistance) continue;
if (distance < shortestDistance) {
tilesToCreate.clear();
shortestDistance = distance;
}
tilesToCreate.add(new Coordinate(xCoordinate, yCoordinate));
}
}
// Now construct the tile(s) within the shortest distance.
int tilesToCreateCount = tilesToCreate.size();
for (int n = 0; n < tilesToCreateCount; ++n) {
Coordinate coordinate = tilesToCreate.get(n);
setTile(coordinate, mBackend.createTile(coordinate));
}
requiredTileCount -= tilesToCreateCount;
// Paint the content of the newly created tiles or resized tiles.
if (tilesToCreateCount != 0 || didResizeTiles) updateTileBuffers(task);
// Re-call createTiles on a timer to cover the visible area with the newest shortest distance.
mPendingTileCreation = requiredTileCount != 0;
if (mPendingTileCreation) {
if (!mCommitTileUpdatesOnIdleEventLoop) {
mClient.tbsHasPendingTileCreation();
return;
}
Log.d(
"tt",
"start BSUpdate scheduleTask in createTiles func scale "
+ mContentsScale
+ " pending scale "
+ mPendingScale);
if (task == null || !task.cancelled()) startBSUpdateTask(TILE_CREATION_DELAY_MS);
}
}
public void paint(GLCanvas canvas, int offsetX, int offsetY, final Rect rect) {
synchronized (mScaleBufferTiles) {
Iterator<Entry<Coordinate, ITile>> it = mScaleBufferTiles.iterator();
while (it.hasNext()) {
Entry<Coordinate, ITile> entry = it.next();
ITile currentTile = entry.getValue();
if (currentTile != null && currentTile.isReadyToPaint()) {
float scale = mPendingScale == 0 ? mContentsScale : mPendingScale;
currentTile.paint(canvas, offsetX, offsetY, null, scale / mScaleBufferTiles.getScale());
}
}
}
Rect dirtyRect = mapFromContents(rect, mScaleBufferTiles.getScale());
Coordinate topLeft = tileCoordinateForPoint(dirtyRect.getLeft(), dirtyRect.getTop());
Coordinate bottomRight = tileCoordinateForPoint(dirtyRect.getRight(), dirtyRect.getBottom());
// for (int yCoordinate = topLeft.getY(); yCoordinate <= bottomRight.getY();
// ++yCoordinate) {
// for (int xCoordinate = topLeft.getX(); xCoordinate <= bottomRight.getX();
// ++xCoordinate) {
// Coordinate currentCoordinate = new Coordinate(xCoordinate, yCoordinate);
// ITile currentTile = mScaleBufferTiles.get(currentCoordinate);
// if (currentTile != null && currentTile.isReadyToPaint()) {
// currentTile.paint(canvas, offsetX, offsetY, dirtyRect, mPendingScale /
// mScaleBufferTiles.getScale());
// } else {
// Rect tileRect = tileRectForCoordinate(currentCoordinate);
// Rect target = Rect.intersect(tileRect, dirtyRect);
// if (target == null || target.isEmpty())
// continue;
//
//// float scaleFactor = mOldScale == 0 ? 1 : mContentsScale / mOldScale;
//// float left = offsetX + target.getLeft() * scaleFactor;
//// float top = offsetY + target.getTop() * scaleFactor;
//// float width = target.getWidth() * scaleFactor;
//// float height = target.getHeight() * scaleFactor;
// // canvas.drawTexture(mTextureBuffer.getCheckerTextureID(canvas.getGL(),
// (int)width, (int)height), left, top, width, height);
// }
//
// }
// }
dirtyRect = mapFromContents(rect);
topLeft = tileCoordinateForPoint(dirtyRect.getLeft(), dirtyRect.getTop());
bottomRight = tileCoordinateForPoint(dirtyRect.getRight(), dirtyRect.getBottom());
for (int yCoordinate = topLeft.getY(); yCoordinate <= bottomRight.getY(); ++yCoordinate) {
for (int xCoordinate = topLeft.getX(); xCoordinate <= bottomRight.getX(); ++xCoordinate) {
Coordinate currentCoordinate = new Coordinate(xCoordinate, yCoordinate);
ITile currentTile = mMainTiles.get(currentCoordinate);
if (currentTile != null && currentTile.isReadyToPaint()) {
float scaleFactor = mPendingScale == 0 ? 1 : mPendingScale / mContentsScale;
currentTile.paint(canvas, offsetX, offsetY, dirtyRect, scaleFactor);
} else {
Rect tileRect = tileRectForCoordinate(currentCoordinate);
Rect target = Rect.intersect(tileRect, dirtyRect);
if (target == null || target.isEmpty()) continue;
float scaleFactor = mPendingScale == 0 ? 1 : mPendingScale / mContentsScale;
float left = offsetX + target.getLeft() * scaleFactor;
float top = offsetY + target.getTop() * scaleFactor;
float width = target.getWidth() * scaleFactor;
float height = target.getHeight() * scaleFactor;
//
// canvas.drawTexture(mTextureBuffer.getCheckerTextureID(canvas.getGL(), (int)width,
// (int)height), left, top, width, height);
}
}
}
}