JavaFX 27 · com.sun.glass.ui.monocle.EPDFrameBuffer · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
private static final int	BITS_TO_BYTES The arithmetic right shift value to convert a bit depth to a byte depth.
private final int	bitsPerPixel
private final int	byteOffset
private final int	bytesPerPixel
private final EPDSystem	driver
private static final int	ENOTTY Linux system error: ENOTTY 25 Inappropriate ioctl for device.
private final long	fd
private int	lastMarker
private final PlatformLogger	logger
private static final int	POWERDOWN_DELAY The delay in milliseconds between the completion of all updates in the EPDC driver and when the driver powers down the EPDC and display power supplies.
private final EPDSettings	settings
private final EPDSystem.MxcfbUpdateData	syncUpdate
private final LinuxSystem	system
private final EPDSystem.MxcfbUpdateData	updateData
private int	updateMarker
private final int	xoffset
private final int	xres
private final int	xresVirtual
private final int	yoffset
private final int	yres
private final int	yresVirtual

Access	Constructor and Description
pack-priv	EPDFrameBuffer(String the frame buffer device path, such as /dev/fb0 fbPath) Creates a new `EPDFrameBuffer` for the given frame buffer device.

Method Summary

Modifier and Type	Method and Description
pack-priv void	clear() Clears the display panel.
pack-priv void	close() Closes the Linux frame buffer device.
private EPDSystem.MxcfbUpdateData	Returns: the default update data with all fields set but the update marker createDefaultUpdate(int the width of the update region width, int the height of the update region height) Creates the default update data with values from the EPD system properties, setting all fields except for the update marker.
pack-priv int	Returns: the color depth in bits per pixel getBitDepth() Gets the frame buffer color depth in bits per pixel.
pack-priv int	Returns: the offset in bytes getByteOffset() Gets the number of bytes from the beginning of the frame buffer to the start of its visible resolution.
pack-priv int	Returns: the height in pixels getHeight() Gets the frame buffer height in pixels.
pack-priv ByteBuffer	Returns: a byte buffer containing the mapping of the Linux frame buffer device if successful; otherwise `null` getMappedBuffer() Creates a new mapping of the Linux frame buffer device into memory.
pack-priv long	Returns: the frame buffer device file descriptor getNativeHandle() Gets the native handle to the Linux frame buffer device.
pack-priv ByteBuffer	Returns: a 32-bit pixel buffer matching the resolution of the frame buffer getOffscreenBuffer() Creates an off-screen byte buffer equal in resolution to the virtual resolution of the frame buffer, but with 32 bits per pixel.
private int	Returns: the delay in milliseconds getPowerdownDelay() Gets the current power-down delay from the EPDC driver.
private void	getScreenInfo(EPDSystem.FbVarScreenInfo the object representing the variable screen information screen) Gets the variable screen information of the frame buffer.
pack-priv int	Returns: the width in pixels getWidth() Gets the frame buffer width in pixels.
pack-priv void	init() Initializes the EPDC frame buffer device, setting the update scheme to `EPDSystem#UPDATE_SCHEME_SNAPSHOT`.
private void	logScreenInfo(EPDSystem.FbVarScreenInfo the object representing the variable screen information screen) Logs the variable screen information of the frame buffer, depending on the logging level.
pack-priv void	releaseMappedBuffer(ByteBuffer the byte buffer containing the mapping of the Linux frame buffer device buffer) Deletes the mapping of the Linux frame buffer device.
private int	Returns: the marker to identify this update in a subsequence call to `waitForUpdateComplete` sendUpdate(int the update mode, one of: `EPDSystem#UPDATE_MODE_PARTIAL` `EPDSystem#UPDATE_MODE_FULL` updateMode, int the waveform mode, one of: `EPDSystem#WAVEFORM_MODE_INIT` `EPDSystem#WAVEFORM_MODE_DU` `EPDSystem#WAVEFORM_MODE_GC16` `EPDSystem#WAVEFORM_MODE_GC4` `EPDSystem#WAVEFORM_MODE_A2` `EPDSystem#WAVEFORM_MODE_AUTO` waveformMode, int a bit mask composed of the following flag values: `EPDSystem#EPDC_FLAG_ENABLE_INVERSION` `EPDSystem#EPDC_FLAG_FORCE_MONOCHROME` `EPDSystem#EPDC_FLAG_USE_DITHERING_Y1` `EPDSystem#EPDC_FLAG_USE_DITHERING_Y4` flags) Requests the entire visible region of the frame buffer to be updated to the display.
private int	Returns: the marker to identify this update in a subsequence call to `waitForUpdateComplete` sendUpdate(EPDSystem.MxcfbUpdateData the data describing the update; the waveform mode and update marker are overwritten update, int the waveform mode for this update waveformMode) Requests an update to the display, allowing for the reuse of the update data object.
private void	setAutoUpdateMode(int the automatic update mode, one of: `EPDSystem#AUTO_UPDATE_MODE_REGION_MODE` `EPDSystem#AUTO_UPDATE_MODE_AUTOMATIC_MODE` mode) Selects between automatic and region update mode.
private void	setPowerdownDelay(int the delay in milliseconds delay) Sets the delay between the completion of all updates in the driver and when the driver should power down the EPDC and display power supplies.
private void	setScreenInfo(EPDSystem.FbVarScreenInfo the object representing the variable screen information screen) Sets the variable screen information of the frame buffer.
private void	setTemperature(int the temperature in degrees Celsius temp) Sets the temperature to be used by the EPDC driver in subsequent panel updates.
private void	setUpdateScheme(int the update scheme, one of: `EPDSystem#UPDATE_SCHEME_SNAPSHOT` `EPDSystem#UPDATE_SCHEME_QUEUE` `EPDSystem#UPDATE_SCHEME_QUEUE_AND_MERGE` scheme) Selects a scheme for the flow of updates within the driver.
private void	setWaveformModes(int the initialization mode for clearing the screen to all white init, int the direct update mode for changing any gray values to either all black or all white du, int the mode for 4-level (2-bit) grayscale images and text gc4, int the mode for 8-level (3-bit) grayscale images and text gc8, int the mode for 16-level (4-bit) grayscale images and text gc16, int the mode for 32-level (5-bit) grayscale images and text gc32) Defines a mapping for common waveform modes.
pack-priv void	sync() Sends the updated contents of the Linux frame buffer to the EPDC driver, optionally synchronizing with the driver by first waiting for the previous update to complete.
public String	toString() Overrides java.lang.Object.toString. Returns a string representation of the object.
private void	waitForUpdateComplete(int the marker to identify a particular update, returned by `sendUpdate(MxcfbUpdateData, int)` marker) Blocks and waits for a previous update request to complete.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll wait wait wait

BITS_TO_BYTES	back to summary
private static final int BITS_TO_BYTES The arithmetic right shift value to convert a bit depth to a byte depth.

bitsPerPixel	back to summary
private final int bitsPerPixel

byteOffset	back to summary
private final int byteOffset

bytesPerPixel	back to summary
private final int bytesPerPixel

driver	back to summary
private final EPDSystem driver

ENOTTY	back to summary
private static final int ENOTTY Linux system error: ENOTTY 25 Inappropriate ioctl for device.

fd	back to summary
private final long fd

lastMarker	back to summary
private int lastMarker

logger	back to summary
private final PlatformLogger logger

POWERDOWN_DELAY	back to summary
private static final int POWERDOWN_DELAY The delay in milliseconds between the completion of all updates in the EPDC driver and when the driver powers down the EPDC and display power supplies.

settings	back to summary
private final EPDSettings settings

syncUpdate	back to summary
private final EPDSystem.MxcfbUpdateData syncUpdate

system	back to summary
private final LinuxSystem system

updateData	back to summary
private final EPDSystem.MxcfbUpdateData updateData

updateMarker	back to summary
private int updateMarker

xoffset	back to summary
private final int xoffset

xres	back to summary
private final int xres

xresVirtual	back to summary
private final int xresVirtual

yoffset	back to summary
private final int yoffset

yres	back to summary
private final int yres

yresVirtual	back to summary
private final int yresVirtual

EPDFrameBuffer	back to summary
pack-priv EPDFrameBuffer(String fbPath) throws IOException Creates a new `EPDFrameBuffer` for the given frame buffer device. The geometry of the Linux frame buffer is shown below for various color depths and rotations on a sample system, as printed by the fbset command. The first three are for landscape mode, while the last three are for portrait. `geometry 800 600 800 640 32 (line length: 3200) geometry 800 600 800 1280 16 (line length: 1600) geometry 800 600 800 1280 8 (line length: 800) geometry 600 800 608 896 32 (line length: 2432) geometry 600 800 608 1792 16 (line length: 1216) geometry 600 800 608 1792 8 (line length: 608)` Implementation Note `MonocleApplication` creates a `Screen` which requires that the width be set to `xresVirtual` even though only the first `xres` pixels of each row are visible. The EPDC driver supports panning only in the y-direction, so it is not possible to center the visible resolution horizontally when these values differ. The JavaFX application should be left-aligned in this case and ignore the few extra pixels on the right of its screen. Parameters fbPath:String the frame buffer device path, such as /dev/fb0 Exceptions IOException: if an error occurs when opening the frame buffer device or when getting or setting the frame buffer configuration IllegalArgumentException: if the EPD settings specify an unsupported color depth

Method Detail

clear	back to summary
pack-priv void clear() Clears the display panel. The visible frame buffer should be cleared with zeros when called. This method sends two direct updates (all black followed by all white) to refresh the screen and clear any ghosting effects, and returns when both updates are complete. This method is not thread safe, but it is invoked only once from the Event Thread during initialization.

clear

back to summary

pack-priv void clear()

Clears the display panel. The visible frame buffer should be cleared with zeros when called. This method sends two direct updates (all black followed by all white) to refresh the screen and clear any ghosting effects, and returns when both updates are complete.

This method is not thread safe, but it is invoked only once from the Event Thread during initialization.

close	back to summary
pack-priv void close() Closes the Linux frame buffer device.

createDefaultUpdate back to summary

createDefaultUpdate	back to summary
private EPDSystem.MxcfbUpdateData createDefaultUpdate(int width, int height) Creates the default update data with values from the EPD system properties, setting all fields except for the update marker. Reusing the update data object avoids creating a new one for each update request. Implementation Note An update mode of `EPDSystem#UPDATE_MODE_FULL` would make the `EPDSettings#NO_WAIT` system property useless by changing all non-colliding updates into colliding ones, so this method sets the default update mode to `EPDSystem#UPDATE_MODE_PARTIAL`. Parameters width:int the width of the update region height:int the height of the update region Returns:EPDSystem.MxcfbUpdateData the default update data with all fields set but the update marker

private EPDSystem.MxcfbUpdateData createDefaultUpdate(int width, int height)

Creates the default update data with values from the EPD system properties, setting all fields except for the update marker. Reusing the update data object avoids creating a new one for each update request.

Implementation Note

An update mode of EPDSystem#UPDATE_MODE_FULL would make the EPDSettings#NO_WAIT system property useless by changing all non-colliding updates into colliding ones, so this method sets the default update mode to EPDSystem#UPDATE_MODE_PARTIAL.

Parameters

width:int: the width of the update region
height:int: the height of the update region

Returns:EPDSystem.MxcfbUpdateData

the default update data with all fields set but the update marker

getBitDepth	back to summary
pack-priv int getBitDepth() Gets the frame buffer color depth in bits per pixel. Returns:int the color depth in bits per pixel

getBitDepth

back to summary

pack-priv int getBitDepth()

Gets the frame buffer color depth in bits per pixel.

Returns:int: the color depth in bits per pixel

getByteOffset	back to summary
pack-priv int getByteOffset() Gets the number of bytes from the beginning of the frame buffer to the start of its visible resolution. Returns:int the offset in bytes

getByteOffset

back to summary

pack-priv int getByteOffset()

Gets the number of bytes from the beginning of the frame buffer to the start of its visible resolution.

Returns:int: the offset in bytes

getHeight	back to summary
pack-priv int getHeight() Gets the frame buffer height in pixels. Returns:int the height in pixels

getHeight

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pack-priv int getHeight()

Gets the frame buffer height in pixels.

Returns:int: the height in pixels

getMappedBuffer back to summary

getMappedBuffer	back to summary
pack-priv ByteBuffer getMappedBuffer() Creates a new mapping of the Linux frame buffer device into memory. Implementation Note The virtual y-resolution reported by the device driver can be wrong, as shown by the following example on the Kobo Glo HD Model N437 which reports 2,304 pixels when the correct value is 1,152 pixels (6,782,976 / 5,888). Therefore, this method cannot use the frame buffer virtual resolution to calculate its size. `$ sudo fbset -i mode "1448x1072-46" # D: 80.000 MHz, H: 50.188 kHz, V: 46.385 Hz geometry 1448 1072 1472 2304 32 timings 12500 16 102 4 4 28 2 rgba 8/16,8/8,8/0,8/24 endmode Frame buffer device information: Name : mxc_epdc_fb Address : 0x88000000 Size : 6782976 Type : PACKED PIXELS Visual : TRUECOLOR XPanStep : 1 YPanStep : 1 YWrapStep : 0 LineLength : 5888 Accelerator : No` Returns:ByteBuffer a byte buffer containing the mapping of the Linux frame buffer device if successful; otherwise `null`

pack-priv ByteBuffer getMappedBuffer()

Creates a new mapping of the Linux frame buffer device into memory.

Implementation Note

The virtual y-resolution reported by the device driver can be wrong, as shown by the following example on the Kobo Glo HD Model N437 which reports 2,304 pixels when the correct value is 1,152 pixels (6,782,976 / 5,888). Therefore, this method cannot use the frame buffer virtual resolution to calculate its size.

$ sudo fbset -i

mode "1448x1072-46"
# D: 80.000 MHz, H: 50.188 kHz, V: 46.385 Hz
geometry 1448 1072 1472 2304 32
timings 12500 16 102 4 4 28 2
rgba 8/16,8/8,8/0,8/24
endmode

Frame buffer device information:
Name        : mxc_epdc_fb
Address     : 0x88000000
Size        : 6782976
Type        : PACKED PIXELS
Visual      : TRUECOLOR
XPanStep    : 1
YPanStep    : 1
YWrapStep   : 0
LineLength  : 5888
Accelerator : No

Returns:ByteBuffer: a byte buffer containing the mapping of the Linux frame buffer device if successful; otherwise null

getNativeHandle	back to summary
pack-priv long getNativeHandle() Gets the native handle to the Linux frame buffer device. Returns:long the frame buffer device file descriptor

getNativeHandle

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pack-priv long getNativeHandle()

Gets the native handle to the Linux frame buffer device.

Returns:long: the frame buffer device file descriptor

getOffscreenBuffer	back to summary
pack-priv ByteBuffer getOffscreenBuffer() Creates an off-screen byte buffer equal in resolution to the virtual resolution of the frame buffer, but with 32 bits per pixel. Returns:ByteBuffer a 32-bit pixel buffer matching the resolution of the frame buffer

getOffscreenBuffer

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pack-priv ByteBuffer getOffscreenBuffer()

Creates an off-screen byte buffer equal in resolution to the virtual resolution of the frame buffer, but with 32 bits per pixel.

Returns:ByteBuffer: a 32-bit pixel buffer matching the resolution of the frame buffer

getPowerdownDelay	back to summary
private int getPowerdownDelay() Gets the current power-down delay from the EPDC driver. Returns:int the delay in milliseconds

getPowerdownDelay

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private int getPowerdownDelay()

Gets the current power-down delay from the EPDC driver.

Returns:int: the delay in milliseconds

getScreenInfo	back to summary
private void getScreenInfo(EPDSystem.FbVarScreenInfo screen) throws IOException Gets the variable screen information of the frame buffer. Run the fbset command as root to print the screen information. Parameters screen:EPDSystem.FbVarScreenInfo the object representing the variable screen information Exceptions IOException: if an error occurs getting the information

getScreenInfo

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private void getScreenInfo(EPDSystem.FbVarScreenInfo screen) throws IOException

Gets the variable screen information of the frame buffer. Run the fbset command as root to print the screen information.

Parameters

screen:EPDSystem.FbVarScreenInfo: the object representing the variable screen information

Exceptions

IOException:: if an error occurs getting the information

getWidth back to summary

getWidth	back to summary
pack-priv int getWidth() Gets the frame buffer width in pixels. See the notes for the constructor above. Implementation Note When using an 8-bit, unrotated, and uninverted frame buffer in the Y8 pixel format, the Kobo Clara HD Model N249 works only when this method returns the visible x-resolution (`xres`) instead of the normal virtual x-resolution (`xresVirtual`). Returns:int the width in pixels

pack-priv int getWidth()

Gets the frame buffer width in pixels. See the notes for the constructor above.

Implementation Note

When using an 8-bit, unrotated, and uninverted frame buffer in the Y8 pixel format, the Kobo Clara HD Model N249 works only when this method returns the visible x-resolution (xres) instead of the normal virtual x-resolution (xresVirtual).

Returns:int: the width in pixels

init	back to summary
pack-priv void init() Initializes the EPDC frame buffer device, setting the update scheme to `EPDSystem#UPDATE_SCHEME_SNAPSHOT`.

logScreenInfo	back to summary
private void logScreenInfo(EPDSystem.FbVarScreenInfo screen) Logs the variable screen information of the frame buffer, depending on the logging level. Parameters screen:EPDSystem.FbVarScreenInfo the object representing the variable screen information

logScreenInfo

back to summary

private void logScreenInfo(EPDSystem.FbVarScreenInfo screen)

Logs the variable screen information of the frame buffer, depending on the logging level.

Parameters

screen:EPDSystem.FbVarScreenInfo: the object representing the variable screen information

releaseMappedBuffer	back to summary
pack-priv void releaseMappedBuffer(ByteBuffer buffer) Deletes the mapping of the Linux frame buffer device. Parameters buffer:ByteBuffer the byte buffer containing the mapping of the Linux frame buffer device

releaseMappedBuffer

back to summary

pack-priv void releaseMappedBuffer(ByteBuffer buffer)

Deletes the mapping of the Linux frame buffer device.

Parameters

buffer:ByteBuffer: the byte buffer containing the mapping of the Linux frame buffer device

sendUpdate back to summary

sendUpdate	back to summary
private int sendUpdate(int updateMode, int waveformMode, int flags) Requests the entire visible region of the frame buffer to be updated to the display. Parameters updateMode:int the update mode, one of: `EPDSystem#UPDATE_MODE_PARTIAL` `EPDSystem#UPDATE_MODE_FULL` waveformMode:int the waveform mode, one of: `EPDSystem#WAVEFORM_MODE_INIT` `EPDSystem#WAVEFORM_MODE_DU` `EPDSystem#WAVEFORM_MODE_GC16` `EPDSystem#WAVEFORM_MODE_GC4` `EPDSystem#WAVEFORM_MODE_A2` `EPDSystem#WAVEFORM_MODE_AUTO` flags:int a bit mask composed of the following flag values: `EPDSystem#EPDC_FLAG_ENABLE_INVERSION` `EPDSystem#EPDC_FLAG_FORCE_MONOCHROME` `EPDSystem#EPDC_FLAG_USE_DITHERING_Y1` `EPDSystem#EPDC_FLAG_USE_DITHERING_Y4` Returns:int the marker to identify this update in a subsequence call to `waitForUpdateComplete`

private int sendUpdate(int updateMode, int waveformMode, int flags)

Requests the entire visible region of the frame buffer to be updated to the display.

Parameters

updateMode:int

the update mode, one of:

waveformMode:int

the waveform mode, one of:

flags:int

a bit mask composed of the following flag values:

Returns:int

the marker to identify this update in a subsequence call to waitForUpdateComplete

sendUpdate back to summary

sendUpdate	back to summary
private int sendUpdate(EPDSystem.MxcfbUpdateData update, int waveformMode) Requests an update to the display, allowing for the reuse of the update data object. The waveform mode is reset because the update data could have been used in a previous update. In that case, the waveform mode may have been modified by the EPDC driver with the actual mode selected. The update marker is overwritten with the next sequential marker. Parameters update:EPDSystem.MxcfbUpdateData the data describing the update; the waveform mode and update marker are overwritten waveformMode:int the waveform mode for this update Returns:int the marker to identify this update in a subsequence call to `waitForUpdateComplete`

private int sendUpdate(EPDSystem.MxcfbUpdateData update, int waveformMode)

Requests an update to the display, allowing for the reuse of the update data object. The waveform mode is reset because the update data could have been used in a previous update. In that case, the waveform mode may have been modified by the EPDC driver with the actual mode selected. The update marker is overwritten with the next sequential marker.

Parameters

update:EPDSystem.MxcfbUpdateData: the data describing the update; the waveform mode and update marker are overwritten
waveformMode:int: the waveform mode for this update

Returns:int

the marker to identify this update in a subsequence call to waitForUpdateComplete

setAutoUpdateMode back to summary

setAutoUpdateMode	back to summary
private void setAutoUpdateMode(int mode) Selects between automatic and region update mode. In region update mode, updates must be submitted with an IOCTL call to `EPDSystem#MXCFB_SEND_UPDATE`. In automatic mode, updates are generated by the driver when it detects that pages in a frame buffer memory region have been modified. Automatic mode is available only when it has been enabled in the Linux kernel by the option CONFIG_FB_MXC_EINK_AUTO_UPDATE_MODE. You can find the configuration options used to build the kernel in a file under /proc or /boot, such as /proc/config.gz. Parameters mode:int the automatic update mode, one of: `EPDSystem#AUTO_UPDATE_MODE_REGION_MODE` `EPDSystem#AUTO_UPDATE_MODE_AUTOMATIC_MODE`

private void setAutoUpdateMode(int mode)

Selects between automatic and region update mode. In region update mode, updates must be submitted with an IOCTL call to EPDSystem#MXCFB_SEND_UPDATE. In automatic mode, updates are generated by the driver when it detects that pages in a frame buffer memory region have been modified.

Automatic mode is available only when it has been enabled in the Linux kernel by the option CONFIG_FB_MXC_EINK_AUTO_UPDATE_MODE. You can find the configuration options used to build the kernel in a file under /proc or /boot, such as /proc/config.gz.

Parameters

mode:int

the automatic update mode, one of:

setPowerdownDelay back to summary

setPowerdownDelay	back to summary
private void setPowerdownDelay(int delay) Sets the delay between the completion of all updates in the driver and when the driver should power down the EPDC and display power supplies. To disable powering down entirely, use the delay value `EPDSystem#FB_POWERDOWN_DISABLE`. Parameters delay:int the delay in milliseconds

private void setPowerdownDelay(int delay)

Sets the delay between the completion of all updates in the driver and when the driver should power down the EPDC and display power supplies. To disable powering down entirely, use the delay value EPDSystem#FB_POWERDOWN_DISABLE.

Parameters

delay:int: the delay in milliseconds

setScreenInfo back to summary

setScreenInfo	back to summary
private void setScreenInfo(EPDSystem.FbVarScreenInfo screen) throws IOException Sets the variable screen information of the frame buffer. "To ensure that the EPDC driver receives the initialization request, the `activate` field of the `fb_var_screeninfo` parameter should be set to `FB_ACTIVATE_FORCE`." [EPDC Panel Initialization, i.MX Linux Reference Manual] To request a change to 8-bit grayscale format, the bits per pixel must be set to 8 and the grayscale value must be set to one of the two valid grayscale format values: `GRAYSCALE_8BIT` or `GRAYSCALE_8BIT_INVERTED`. [Grayscale Framebuffer Selection, i.MX Linux Reference Manual] Parameters screen:EPDSystem.FbVarScreenInfo the object representing the variable screen information Exceptions IOException: if an error occurs setting the information

private void setScreenInfo(EPDSystem.FbVarScreenInfo screen) throws IOException

Sets the variable screen information of the frame buffer.

"To ensure that the EPDC driver receives the initialization request, the activate field of the fb_var_screeninfo parameter should be set to FB_ACTIVATE_FORCE." [EPDC Panel Initialization, i.MX Linux Reference Manual]

To request a change to 8-bit grayscale format, the bits per pixel must be set to 8 and the grayscale value must be set to one of the two valid grayscale format values: GRAYSCALE_8BIT or GRAYSCALE_8BIT_INVERTED. [Grayscale Framebuffer Selection, i.MX Linux Reference Manual]

Parameters

screen:EPDSystem.FbVarScreenInfo: the object representing the variable screen information

Exceptions

IOException:: if an error occurs setting the information

setTemperature back to summary

setTemperature	back to summary
private void setTemperature(int temp) Sets the temperature to be used by the EPDC driver in subsequent panel updates. Note that this temperature setting may be overridden by setting the temperature in a specific update to anything other than `EPDSystem#TEMP_USE_AMBIENT`. Parameters temp:int the temperature in degrees Celsius

private void setTemperature(int temp)

Sets the temperature to be used by the EPDC driver in subsequent panel updates. Note that this temperature setting may be overridden by setting the temperature in a specific update to anything other than EPDSystem#TEMP_USE_AMBIENT.

Parameters

temp:int: the temperature in degrees Celsius

setUpdateScheme back to summary

setUpdateScheme	back to summary
private void setUpdateScheme(int scheme) Selects a scheme for the flow of updates within the driver. Parameters scheme:int the update scheme, one of: `EPDSystem#UPDATE_SCHEME_SNAPSHOT` `EPDSystem#UPDATE_SCHEME_QUEUE` `EPDSystem#UPDATE_SCHEME_QUEUE_AND_MERGE`

private void setUpdateScheme(int scheme)

Selects a scheme for the flow of updates within the driver.

Parameters

scheme:int

the update scheme, one of:

setWaveformModes back to summary

setWaveformModes	back to summary
private void setWaveformModes(int init, int du, int gc4, int gc8, int gc16, int gc32) Defines a mapping for common waveform modes. This mapping must be configured for the automatic waveform mode selection to function properly. Each of the parameters should be set to one of the following: `EPDSystem#WAVEFORM_MODE_INIT` `EPDSystem#WAVEFORM_MODE_DU` `EPDSystem#WAVEFORM_MODE_GC16` `EPDSystem#WAVEFORM_MODE_GC4` `EPDSystem#WAVEFORM_MODE_A2` Implementation Note This method fails on the Kobo Glo HD Model N437 with the error ENOTTY (25), "Inappropriate ioctl for device." The driver on that device uses an extended structure with four additional integers, changing its size and its corresponding request code. This method could use the extended structure, but the driver on the Kobo Glo HD ignores it and returns immediately, anyway. Furthermore, newer devices support both the current structure and the extended one, but define the extra fields in a different order. Therefore, simply use the current structure and ignore an error of ENOTTY, picking up the default values for any extra fields. Parameters init:int the initialization mode for clearing the screen to all white du:int the direct update mode for changing any gray values to either all black or all white gc4:int the mode for 4-level (2-bit) grayscale images and text gc8:int the mode for 8-level (3-bit) grayscale images and text gc16:int the mode for 16-level (4-bit) grayscale images and text gc32:int the mode for 32-level (5-bit) grayscale images and text

private void setWaveformModes(int init, int du, int gc4, int gc8, int gc16, int gc32)

Defines a mapping for common waveform modes. This mapping must be configured for the automatic waveform mode selection to function properly. Each of the parameters should be set to one of the following:

Implementation Note

This method fails on the Kobo Glo HD Model N437 with the error ENOTTY (25), "Inappropriate ioctl for device." The driver on that device uses an extended structure with four additional integers, changing its size and its corresponding request code. This method could use the extended structure, but the driver on the Kobo Glo HD ignores it and returns immediately, anyway. Furthermore, newer devices support both the current structure and the extended one, but define the extra fields in a different order. Therefore, simply use the current structure and ignore an error of ENOTTY, picking up the default values for any extra fields.

Parameters

init:int: the initialization mode for clearing the screen to all white
du:int: the direct update mode for changing any gray values to either all black or all white
gc4:int: the mode for 4-level (2-bit) grayscale images and text
gc8:int: the mode for 8-level (3-bit) grayscale images and text
gc16:int: the mode for 16-level (4-bit) grayscale images and text
gc32:int: the mode for 32-level (5-bit) grayscale images and text

sync	back to summary
pack-priv void sync() Sends the updated contents of the Linux frame buffer to the EPDC driver, optionally synchronizing with the driver by first waiting for the previous update to complete. This method is not thread safe, but it is invoked only from the JavaFX Application Thread.

sync

back to summary

pack-priv void sync()

Sends the updated contents of the Linux frame buffer to the EPDC driver, optionally synchronizing with the driver by first waiting for the previous update to complete.

This method is not thread safe, but it is invoked only from the JavaFX Application Thread.

toString back to summary

toString	back to summary
public String toString() Overrides java.lang.Object.toString. Doc from java.lang.Object.toString. Returns a string representation of the object. Satisfying this method's contract implies a non-`null` result must be returned. Annotations @Override

public String toString()

Overrides java.lang.Object.toString.

Doc from java.lang.Object.toString.

Returns a string representation of the object. Satisfying this method's contract implies a non-null result must be returned.

Annotations

@Override

waitForUpdateComplete back to summary

private void waitForUpdateComplete(int marker)

Blocks and waits for a previous update request to complete.

Parameters

marker:int: the marker to identify a particular update, returned by sendUpdate(MxcfbUpdateData, int)

pack-priv Class EPDFrameBuffer

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail