This class implements the variation with a small fixed-size margin with velocity bias. More...

Inheritance diagram for org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy:

Collaboration diagram for org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy:

Public Member Functions
DisplayPortMetrics	calculate (ImmutableViewportMetrics metrics, PointF velocity)
	Calculates a displayport given a viewport and panning velocity. More...

boolean	aboutToCheckerboard (ImmutableViewportMetrics metrics, PointF velocity, DisplayPortMetrics displayPort)
	Returns true if a checkerboard is about to be visible and we should not throttle drawing. More...

String	toString ()

Public Member Functions inherited from org.mozilla.gecko.gfx.DisplayPortCalculator.DisplayPortStrategy
abstract DisplayPortMetrics	calculate (ImmutableViewportMetrics metrics, PointF velocity)
	Calculates a displayport given a viewport and panning velocity. More...

abstract boolean	aboutToCheckerboard (ImmutableViewportMetrics metrics, PointF velocity, DisplayPortMetrics displayPort)
	Returns true if a checkerboard is about to be visible and we should not throttle drawing. More...

boolean	drawTimeUpdate (long millis, int pixels)
	Notify the strategy of a new recorded draw time. More...

void	resetPageState ()
	Reset any page-specific state stored, as the page being displayed has changed. More...

Private Member Functions
RectF	velocityBiasedMargins (float xAmount, float yAmount, PointF velocity)
	Split the given amounts into margins based on the VELOCITY_THRESHOLD and REVERSE_BUFFER values. More...

Private Attributes
final float	SIZE_MULTIPLIER

final float	VELOCITY_THRESHOLD

final float	REVERSE_BUFFER

final float	DANGER_ZONE_BASE_X_MULTIPLIER

final float	DANGER_ZONE_BASE_Y_MULTIPLIER

final float	DANGER_ZONE_INCR_X_MULTIPLIER

final float	DANGER_ZONE_INCR_Y_MULTIPLIER

Detailed Description

This class implements the variation with a small fixed-size margin with velocity bias.

In this variation, the default margins are pretty small relative to the view size, but they are affected by the panning velocity. Specifically, if we are panning on one axis, we remove the margins on the other axis because we are likely axis-locked. Also once we are panning in one direction above a certain threshold velocity, we shift the buffer so that it is almost entirely in the direction of the pan, with a little bit in the reverse direction.

Definition at line 329 of file DisplayPortCalculator.java.

Member Function Documentation

◆ aboutToCheckerboard()

boolean org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.aboutToCheckerboard	(	ImmutableViewportMetrics	metrics,
		PointF	velocity,
		DisplayPortMetrics	displayPort
	)

inline

Returns true if a checkerboard is about to be visible and we should not throttle drawing.

Reimplemented from org.mozilla.gecko.gfx.DisplayPortCalculator.DisplayPortStrategy.

Definition at line 415 of file DisplayPortCalculator.java.

◆ calculate()

DisplayPortMetrics org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.calculate	(	ImmutableViewportMetrics	metrics,
		PointF	velocity
	)

inline

Calculates a displayport given a viewport and panning velocity.

Reimplemented from org.mozilla.gecko.gfx.DisplayPortCalculator.DisplayPortStrategy.

Definition at line 388 of file DisplayPortCalculator.java.

◆ toString()

String org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.toString ( )

inline

Definition at line 440 of file DisplayPortCalculator.java.

References org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.DANGER_ZONE_BASE_X_MULTIPLIER, org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.DANGER_ZONE_BASE_Y_MULTIPLIER, org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.DANGER_ZONE_INCR_Y_MULTIPLIER, org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.REVERSE_BUFFER, org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.SIZE_MULTIPLIER, String, and org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.VELOCITY_THRESHOLD.

◆ velocityBiasedMargins()

RectF org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.velocityBiasedMargins	(	float	xAmount,
		float	yAmount,
		PointF	velocity
	)

inlineprivate

Split the given amounts into margins based on the VELOCITY_THRESHOLD and REVERSE_BUFFER values.

If the velocity is above the VELOCITY_THRESHOLD on an axis, split the amount into REVERSE_BUFFER and 1.0 - REVERSE_BUFFER fractions. The REVERSE_BUFFER fraction is set as the margin in the direction opposite to the velocity, and the remaining fraction is set as the margin in the direction of the velocity. If the velocity is lower than VELOCITY_THRESHOLD, split the amount evenly into the two margins on that axis.

Definition at line 364 of file DisplayPortCalculator.java.

References org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.REVERSE_BUFFER, and org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.VELOCITY_THRESHOLD.

Referenced by org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.aboutToCheckerboard(), and org.mozilla.gecko.gfx.DisplayPortCalculator.VelocityBiasStrategy.calculate().