java.awt.image

Class ReplicateScaleFilter

Table des matières
  • All Implemented Interfaces:
    ImageConsumer, Cloneable
    Direct Known Subclasses:
    AreaAveragingScaleFilter

    public class ReplicateScaleFilter
extends ImageFilter
    An ImageFilter class for scaling images using the simplest algorithm. This class extends the basic ImageFilter Class to scale an existing image and provide a source for a new image containing the resampled image. The pixels in the source image are sampled to produce pixels for an image of the specified size by replicating rows and columns of pixels to scale up or omitting rows and columns of pixels to scale down.

    It is meant to be used in conjunction with a FilteredImageSource object to produce scaled versions of existing images. Due to implementation dependencies, there may be differences in pixel values of an image filtered on different platforms.

    See Also:
    FilteredImageSource, ImageFilter

    • Constructor Summary

      Constructors 
      Constructor and Description
      ReplicateScaleFilter(int width, int height)
      Constructs a ReplicateScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.

        

    • Method Summary

      Methods 
      Modifier and Type Method and Description
      void setDimensions(int w, int h)
      Override the dimensions of the source image and pass the dimensions of the new scaled size to the ImageConsumer.
      void setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize)
      Choose which rows and columns of the delivered byte pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.
      void setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize)
      Choose which rows and columns of the delivered int pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.
      void setProperties(Hashtable<?,?> props)
      Passes along the properties from the source object after adding a property indicating the scale applied.

        

    • Field Detail

      • srcWidth

        protected int srcWidth
        The width of the source image.

      • srcHeight

        protected int srcHeight
        The height of the source image.

      • destWidth

        protected int destWidth
        The target width to scale the image.

      • destHeight

        protected int destHeight
        The target height to scale the image.

      • srcrows

        protected int[] srcrows
        An int array containing information about a row of pixels.

      • srccols

        protected int[] srccols
        An int array containing information about a column of pixels.

      • outpixbuf

        protected Object outpixbuf
        A byte array initialized with a size of destWidth and used to deliver a row of pixel data to the ImageConsumer.

    • Constructor Detail

      • ReplicateScaleFilter

        public ReplicateScaleFilter(int width,
                    int height)
        Constructs a ReplicateScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.
        Parameters:
        width - the target width to scale the image
        height - the target height to scale the image
        Throws:
        IllegalArgumentException - if width equals zero or height equals zero

    • Method Detail

      • setProperties

        public void setProperties(Hashtable<?,?> props)
        Passes along the properties from the source object after adding a property indicating the scale applied. This method invokes super.setProperties, which might result in additional properties being added.

        Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

        Specified by:
        setProperties in interface ImageConsumer
        Overrides:
        setProperties in class ImageFilter
        Parameters:
        props - the properties from the source object

      • setDimensions

        public void setDimensions(int w,
                 int h)
        Override the dimensions of the source image and pass the dimensions of the new scaled size to the ImageConsumer.

        Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

        Specified by:
        setDimensions in interface ImageConsumer
        Overrides:
        setDimensions in class ImageFilter
        Parameters:
        w - the width of the source image
        h - the height of the source image
        See Also:
        ImageConsumer

      • setPixels

        public void setPixels(int x,
             int y,
             int w,
             int h,
             ColorModel model,
             byte[] pixels,
             int off,
             int scansize)
        Choose which rows and columns of the delivered byte pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.

        Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

        Specified by:
        setPixels in interface ImageConsumer
        Overrides:
        setPixels in class ImageFilter
        Parameters:
        x - the X coordinate of the upper-left corner of the area of pixels to be set
        y - the Y coordinate 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:
        ImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)

      • setPixels

        public void setPixels(int x,
             int y,
             int w,
             int h,
             ColorModel model,
             int[] pixels,
             int off,
             int scansize)
        Choose which rows and columns of the delivered int pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.

        Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

        Specified by:
        setPixels in interface ImageConsumer
        Overrides:
        setPixels in class ImageFilter
        Parameters:
        x - the X coordinate of the upper-left corner of the area of pixels to be set
        y - the Y coordinate 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:
        ImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)

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Document créé le 28/07/2006, dernière modification le 04/03/2020
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