EpdController

com.onyx.android.sdk.api.device.epd.EpdController

Abstract class (all methods static) providing low-level EPD display control. Hidden API — requires the hiddenapibypass library to be initialised before use. See Hidden-API bypass.

Waveform control 

Signature	Description
`static void invalidate(View, UpdateMode)`	[AI Generated] Triggers an immediate EPD refresh of the entire view using the specified waveform.
`static void invalidate(View, int x, int y, int w, int h, UpdateMode)`	[AI Generated] Triggers a partial EPD refresh of the given screen-absolute rect.
`static void postInvalidate(View, UpdateMode)`	[AI Generated] Schedules an EPD refresh from a background thread.
`static void refreshScreen(View, UpdateMode)`	[AI Generated] Full-screen refresh. Equivalent to `invalidate` on the root view.
`static void refreshScreenRegion(View, int x, int y, int w, int h, UpdateMode)`	[AI Generated] Partial refresh of a screen region.
`static void applyGCOnce()`	[AI Generated] Queues a single GC refresh on the next frame. Clears ghosting without requiring a specific view.

View update mode 

Signature	Description
`static boolean setViewDefaultUpdateMode(View, UpdateMode)`	[AI Generated] Sets the persistent waveform mode for a view. All subsequent normal redraws use this mode until changed or reset.
`static UpdateMode getViewDefaultUpdateMode(View)`	[AI Generated] Returns the current default waveform for a view.
`static boolean resetViewUpdateMode(View)`	[AI Generated] Removes any per-view waveform override, reverting to system default.
`static void enablePost(View, int)`	[AI Generated] Enables EPD post-processing for the view. Pass `1` to activate. Required for `HAND_WRITING_REPAINT_MODE` to function correctly.
`static void enablePost(int)`	[AI Generated] System-wide post-processing toggle. Prefer the per-view overload.

Transient and scoped updates 

Signature	Description
`static boolean applyTransientUpdate(UpdateMode)`	[AI Generated] Applies a temporary waveform for the next redraw only. Reverts automatically after one frame. Useful for suppressing artefacts during mode transitions.
`static boolean clearTransientUpdate(View, boolean)`	[AI Generated] Clears a previously set transient waveform.
`static boolean applyAppScopeUpdate(String pkg, boolean, boolean, UpdateMode, int)`	[AI Generated] Sets a waveform override scoped to a specific package. Persists until `clearAppScopeUpdate()` is called.
`static boolean clearAppScopeUpdate()`	[AI Generated] Removes the current app-scope waveform override.

Display hold / bypass 

Signature	Description
`static void holdDisplay(boolean hold, UpdateMode, int durationMs)`	[AI Generated] When `hold=true`, freezes display output for up to `durationMs` ms, suppressing EPD updates. Can hide render-cycle flicker.
`static void byPass(int)`	[AI Generated] Low-level display bypass control. Undocumented.

Handwriting repaint 

Signature	Description
`static void handwritingRepaint(View, int x, int y, int w, int h)`	[AI Generated] Issues a partial repaint using the handwriting waveform.
`static void handwritingRepaint(View, Rect)`	[AI Generated] Rect-based overload.
`static void enterScribbleMode(View)`	[AI Generated] Puts the EPD driver into scribble (handwriting) mode for the view. The SDK calls this internally around raw drawing sessions.
`static void leaveScribbleMode(View)`	[AI Generated] Exits scribble mode for the view.

Coordinate mapping 

Signature	Description
`static RectF mapToRawTouchPoint(View, RectF)`	[AI Generated] Converts a screen-space rect to the pen digitizer’s native coordinate space. Returns empty if `Device.currentDevice()` failed (hidden API not unblocked).
`static void mapToRawTouchPoint(View, float[] in, float[] out)`	[AI Generated] Point-array overload.
`static void mapFromRawTouchPoint(View, float[] in, float[] out)`	[AI Generated] Inverse: digitizer native → screen space.
`static float getTouchWidth()` / `getTouchHeight()`	[AI Generated] Pen digitizer native resolution (may differ from display).

CTP (Capacitive Touch Panel) control 

Signature	Description
`static void setAppCTPDisableRegion(Context, Rect[])`	[AI Generated] Disables capacitive finger touch in the specified screen regions while leaving stylus input active. Useful to prevent accidental palm touches.
`static void appResetCTPDisableRegion(Context)`	[AI Generated] Removes all app-level CTP disable regions.
`static void powerCTP(boolean)`	[AI Generated] Powers the capacitive touch panel on or off.