java.awt.image

Interface ImageConsumer

All Known Implementing Classes:

AreaAveragingScaleFilter, CropImageFilter, ImageFilter, PixelGrabber, ReplicateScaleFilter, RGBImageFilter

public interface ImageConsumer

The interface for objects expressing interest in image data through the ImageProducer interfaces. When a consumer is added to an image producer, the producer delivers all of the data about the image using the method calls defined in this interface.

Version:

1.20 01/23/03

Author:

Jim Graham

See Also:

ImageProducer

Field Summary

Fields

Modifier and Type	Field and Description
static int	COMPLETESCANLINES The pixels will be delivered in (multiples of) complete scanlines at a time.
static int	IMAGEABORTED The image creation process was deliberately aborted.
static int	IMAGEERROR An error was encountered while producing the image.
static int	RANDOMPIXELORDER The pixels will be delivered in a random order.
static int	SINGLEFRAME The image contain a single static image.
static int	SINGLEFRAMEDONE One frame of the image is complete but there are more frames to be delivered.
static int	SINGLEPASS The pixels will be delivered in a single pass.
static int	STATICIMAGEDONE The image is complete and there are no more pixels or frames to be delivered.
static int	TOPDOWNLEFTRIGHT The pixels will be delivered in top-down, left-to-right order.

Method Summary

Methods

Modifier and Type	Method and Description
void	imageComplete(int status) The imageComplete method is called when the ImageProducer is finished delivering all of the pixels that the source image contains, or when a single frame of a multi-frame animation has been completed, or when an error in loading or producing the image has occured.
void	setColorModel(ColorModel model) Sets the ColorModel object used for the majority of the pixels reported using the setPixels method calls.
void	setDimensions(int width, int height) The dimensions of the source image are reported using the setDimensions method call.
void	setHints(int hintflags) Sets the hints that the ImageConsumer uses to process the pixels delivered by the ImageProducer.
void	setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize) Delivers the pixels of the image with one or more calls to this method.
void	setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize) The pixels of the image are delivered using one or more calls to the setPixels method.
void	setProperties(Hashtable props) Sets the extensible list of properties associated with this image.

Field Detail

RANDOMPIXELORDER

static final int RANDOMPIXELORDER

The pixels will be delivered in a random order. This tells the ImageConsumer not to use any optimizations that depend on the order of pixel delivery, which should be the default assumption in the absence of any call to the setHints method.

See Also:

setHints(int), Constant Field Values

TOPDOWNLEFTRIGHT

static final int TOPDOWNLEFTRIGHT

The pixels will be delivered in top-down, left-to-right order.

See Also:

setHints(int), Constant Field Values

COMPLETESCANLINES

static final int COMPLETESCANLINES

The pixels will be delivered in (multiples of) complete scanlines at a time.

See Also:

setHints(int), Constant Field Values

SINGLEPASS

static final int SINGLEPASS

The pixels will be delivered in a single pass. Each pixel will appear in only one call to any of the setPixels methods. An example of an image format which does not meet this criterion is a progressive JPEG image which defines pixels in multiple passes, each more refined than the previous.

See Also:

setHints(int), Constant Field Values

SINGLEFRAME

static final int SINGLEFRAME

The image contain a single static image. The pixels will be defined in calls to the setPixels methods and then the imageComplete method will be called with the STATICIMAGEDONE flag after which no more image data will be delivered. An example of an image type which would not meet these criteria would be the output of a video feed, or the representation of a 3D rendering being manipulated by the user. The end of each frame in those types of images will be indicated by calling imageComplete with the SINGLEFRAMEDONE flag.

See Also:

setHints(int), imageComplete(int), Constant Field Values

IMAGEERROR

static final int IMAGEERROR

An error was encountered while producing the image.

See Also:

imageComplete(int), Constant Field Values

SINGLEFRAMEDONE

static final int SINGLEFRAMEDONE

One frame of the image is complete but there are more frames to be delivered.

See Also:

imageComplete(int), Constant Field Values

STATICIMAGEDONE

static final int STATICIMAGEDONE

The image is complete and there are no more pixels or frames to be delivered.

See Also:

imageComplete(int), Constant Field Values

IMAGEABORTED

static final int IMAGEABORTED

The image creation process was deliberately aborted.

See Also:

imageComplete(int), Constant Field Values

Method Detail

setDimensions

void setDimensions(int width,
                 int height)

The dimensions of the source image are reported using the setDimensions method call.

Parameters:

width - the width of the source image

height - the height of the source image

setProperties

void setProperties(Hashtable props)

Sets the extensible list of properties associated with this image.

Parameters:

props - the list of properties to be associated with this image

setColorModel

void setColorModel(ColorModel model)

Sets the ColorModel object used for the majority of the pixels reported using the setPixels method calls. Note that each set of pixels delivered using setPixels contains its own ColorModel object, so no assumption should be made that this model will be the only one used in delivering pixel values. A notable case where multiple ColorModel objects may be seen is a filtered image when for each set of pixels that it filters, the filter determines whether the pixels can be sent on untouched, using the original ColorModel, or whether the pixels should be modified (filtered) and passed on using a ColorModel more convenient for the filtering process.

Parameters:

model - the specified ColorModel

See Also:

ColorModel

setHints

void setHints(int hintflags)

Sets the hints that the ImageConsumer uses to process the pixels delivered by the ImageProducer. The ImageProducer can deliver the pixels in any order, but the ImageConsumer may be able to scale or convert the pixels to the destination ColorModel more efficiently or with higher quality if it knows some information about how the pixels will be delivered up front. The setHints method should be called before any calls to any of the setPixels methods with a bit mask of hints about the manner in which the pixels will be delivered. If the ImageProducer does not follow the guidelines for the indicated hint, the results are undefined.

Parameters:

hintflags - a set of hints that the ImageConsumer uses to process the pixels

setPixels

void setPixels(int x,
             int y,
             int w,
             int h,
             ColorModel model,
             byte[] pixels,
             int off,
             int scansize)

Delivers the pixels of the image with one or more calls to this method. Each call specifies the location and size of the rectangle of source pixels that are contained in the array of pixels. The specified ColorModel object should be used to convert the pixels into their corresponding color and alpha components. Pixel (m,n) is stored in the pixels array at index (n * scansize + m + off). The pixels delivered using this method are all stored as bytes.

Parameters:

x, y - the coordinates of the upper-left corner of the area of pixels to be set

w - the width of the area of pixels

h - the height of the area of pixels

model - the specified ColorModel

pixels - the array of pixels

off - the offset into the pixels array

scansize - the distance from one row of pixels to the next in the pixels array

See Also:

ColorModel

setPixels

void setPixels(int x,
             int y,
             int w,
             int h,
             ColorModel model,
             int[] pixels,
             int off,
             int scansize)

The pixels of the image are delivered using one or more calls to the setPixels method. Each call specifies the location and size of the rectangle of source pixels that are contained in the array of pixels. The specified ColorModel object should be used to convert the pixels into their corresponding color and alpha components. Pixel (m,n) is stored in the pixels array at index (n * scansize + m + off). The pixels delivered using this method are all stored as ints. this method are all stored as ints.

Parameters:

x, y - the coordinates of the upper-left corner of the area of pixels to be set

w - the width of the area of pixels

h - the height of the area of pixels

model - the specified ColorModel

pixels - the array of pixels

off - the offset into the pixels array

scansize - the distance from one row of pixels to the next in the pixels array

See Also:

ColorModel

imageComplete

void imageComplete(int status)

The imageComplete method is called when the ImageProducer is finished delivering all of the pixels that the source image contains, or when a single frame of a multi-frame animation has been completed, or when an error in loading or producing the image has occured. The ImageConsumer should remove itself from the list of consumers registered with the ImageProducer at this time, unless it is interested in successive frames.

Parameters:

status - the status of image loading

See Also:

ImageProducer.removeConsumer(java.awt.image.ImageConsumer)