/**
* This function is invoked by Gecko via JNI; be careful when modifying signature. The compositor
* invokes this function whenever it determines that the page rect has changed (based on the
* information it gets from layout). If setFirstPaintViewport is invoked on a frame, then this
* function will not be. For any given frame, this function will be invoked before
* syncViewportInfo.
*/
public void setPageRect(
float cssPageLeft, float cssPageTop, float cssPageRight, float cssPageBottom) {
synchronized (this) {
RectF cssPageRect = new RectF(cssPageLeft, cssPageTop, cssPageRight, cssPageBottom);
float ourZoom = getViewportMetrics().zoomFactor;
setPageRect(RectUtils.scale(cssPageRect, ourZoom), cssPageRect);
// Here the page size of the document has changed, but the document being displayed
// is still the same. Therefore, we don't need to send anything to browser.js; any
// changes we need to make to the display port will get sent the next time we call
// adjustViewport().
}
}
/** Viewport message handler. */
private DisplayPortMetrics handleViewportMessage(
ImmutableViewportMetrics messageMetrics, ViewportMessageType type) {
synchronized (this) {
ImmutableViewportMetrics metrics;
ImmutableViewportMetrics oldMetrics = getViewportMetrics();
switch (type) {
default:
case UPDATE:
// Keep the old viewport size
metrics = messageMetrics.setViewportSize(oldMetrics.getWidth(), oldMetrics.getHeight());
abortPanZoomAnimation();
break;
case PAGE_SIZE:
// adjust the page dimensions to account for differences in zoom
// between the rendered content (which is what Gecko tells us)
// and our zoom level (which may have diverged).
float scaleFactor = oldMetrics.zoomFactor / messageMetrics.zoomFactor;
metrics =
oldMetrics.setPageRect(
RectUtils.scale(messageMetrics.getPageRect(), scaleFactor),
messageMetrics.getCssPageRect());
break;
}
final ImmutableViewportMetrics newMetrics = metrics;
post(
new Runnable() {
public void run() {
mGeckoViewport = newMetrics;
}
});
setViewportMetrics(newMetrics, type == ViewportMessageType.UPDATE);
mDisplayPort = DisplayPortCalculator.calculate(getViewportMetrics(), null);
}
return mDisplayPort;
}