ImagesServiceFactory (Google App Engine API for Java)

com.google.appengine.api.images

Class ImagesServiceFactory

  • java.lang.Object
    • com.google.appengine.api.images.ImagesServiceFactory
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method and Description
      static ImagesService getImagesService()
      Creates an implementation of the ImagesService.
      static Composite makeComposite(Image image, int xOffset, int yOffset, float opacity, Composite.Anchor anchor)
      Creates an image composition operation.
      static CompositeTransform makeCompositeTransform()
      Creates a composite transform that can represent multiple transforms applied in series.
      static CompositeTransform makeCompositeTransform(java.util.Collection<Transform> transforms)
      Creates a composite transform that can represent multiple transforms applied in series.
      static Transform makeCrop(double leftX, double topY, double rightX, double bottomY)
      Creates a transform that will crop an image to fit within the bounding box specified.
      static Transform makeCrop(float leftX, float topY, float rightX, float bottomY)
      Creates a transform that will crop an image to fit within the bounding box specified.
      static Transform makeHorizontalFlip()
      Creates a transform that will horizontally flip an image.
      static Image makeImage(byte[] imageData)
      Creates an image from the provided imageData.
      static Image makeImageFromBlob(BlobKey blobKey)
      Create an image backed by the specified blobKey.
      static Image makeImageFromFilename(java.lang.String filename)
      Create an image backed by the specified filename.
      static Transform makeImFeelingLucky()
      Creates a transform that automatically adjust contrast and color levels.
      static Transform makeResize(int width, int height)
      Creates a transform that will resize an image to fit within a box with width width and height height.
      static Transform makeResize(int width, int height, boolean allowStretch)
      Creates a resize transform that will resize an image to fit within a box of width width and height height.
      static Transform makeResize(int width, int height, double cropOffsetX, double cropOffsetY)
      Creates a transform that will resize an image to exactly fit a box with width width and height height by resizing to the less constraining dimension and cropping the other.
      static Transform makeResize(int width, int height, float cropOffsetX, float cropOffsetY)
      Creates a transform that will resize an image to exactly fit a box with width width and height height by resizing to the less constraining dimension and cropping the other.
      static Transform makeRotate(int degrees)
      Creates a transform that rotates an image by degrees degrees clockwise.
      static Transform makeVerticalFlip()
      Creates a transform that will vertically flip an image.
      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Method Detail

      • getImagesService

        public static ImagesService getImagesService()
        Creates an implementation of the ImagesService.
        Returns:
        an images service
      • makeImage

        public static Image makeImage(byte[] imageData)
        Creates an image from the provided imageData.
        Parameters:
        imageData - image data to store in the image
        Returns:
        an Image containing the supplied image data
        Throws:
        java.lang.IllegalArgumentException - If imageData is null or empty.
      • makeImageFromBlob

        public static Image makeImageFromBlob(BlobKey blobKey)
        Create an image backed by the specified blobKey. Note that the returned Image object can be used with all ImagesService methods, but most of the methods on the Image itself will currently throw UnsupportedOperationException.
        Parameters:
        blobKey - referencing the image
        Returns:
        an Image that references the specified blob data
      • makeImageFromFilename

        public static Image makeImageFromFilename(java.lang.String filename)
        Create an image backed by the specified filename. Note that the returned Image object can be used with all ImagesService methods, but most of the methods on the Image itself will currently throw UnsupportedOperationException.
        Parameters:
        filename - referencing the image. Currently only Google Storage files in the format "/gs/bucket_name/object_name" are supported.
        Returns:
        an Image that references the specified blob data
        Throws:
        java.lang.IllegalArgumentException - If filename is not in the format "/gs/bucket_name/object_name".
        BlobstoreFailureException - If there is an error obtaining the Google Storage access token for the filename.
      • makeResize

        public static Transform makeResize(int width,
                                           int height)
        Creates a transform that will resize an image to fit within a box with width width and height height.
        Parameters:
        width - width of the bounding box
        height - height of the bounding box
        Returns:
        a resize transform
        Throws:
        java.lang.IllegalArgumentException - If width or height are negative or greater than MAX_RESIZE_DIMENSIONS or if both width and height are 0.
      • makeResize

        public static Transform makeResize(int width,
                                           int height,
                                           boolean allowStretch)
        Creates a resize transform that will resize an image to fit within a box of width width and height height. If allowStretch is true, the aspect ratio of the original image will be ignored.
        Parameters:
        width - width of the bounding box
        height - height of the bounding box
        allowStretch - allow the image to be resized ignoring the aspect ratio
        Returns:
        a resize transform
        Throws:
        java.lang.IllegalArgumentException - If width or height are negative or greater than MAX_RESIZE_DIMENSIONS, if both width and height are 0 or if allowStretch is True and either width or height are 0.
      • makeResize

        public static Transform makeResize(int width,
                                           int height,
                                           float cropOffsetX,
                                           float cropOffsetY)
        Creates a transform that will resize an image to exactly fit a box with width width and height height by resizing to the less constraining dimension and cropping the other. The center of the crop region is controlled by cropOffsetX and cropOffsetY.
        Parameters:
        width - width of the bounding box
        height - height of the bounding box
        cropOffsetX - the relative horizontal position of the center
        cropOffsetY - the relative vertical position of the center
        Returns:
        a resize transform
        Throws:
        java.lang.IllegalArgumentException - If width or height are negative or greater than MAX_RESIZE_DIMENSIONS, if either of width and height are 0 or if cropOffsetX or cropOffsetY are outside the range 0.0 to 1.0.
      • makeResize

        public static Transform makeResize(int width,
                                           int height,
                                           double cropOffsetX,
                                           double cropOffsetY)
        Creates a transform that will resize an image to exactly fit a box with width width and height height by resizing to the less constraining dimension and cropping the other. The center of the crop region is controlled by cropOffsetX and cropOffsetY.
        Parameters:
        width - width of the bounding box
        height - height of the bounding box
        cropOffsetX - the relative horizontal position of the center
        cropOffsetY - the relative vertical position of the center
        Returns:
        a resize transform
        Throws:
        java.lang.IllegalArgumentException - If width or height are negative or greater than MAX_RESIZE_DIMENSIONS, if either of width and height are 0 or if cropOffsetX or cropOffsetY are outside the range 0.0 to 1.0.
      • makeCrop

        public static Transform makeCrop(float leftX,
                                         float topY,
                                         float rightX,
                                         float bottomY)
        Creates a transform that will crop an image to fit within the bounding box specified. The arguments define the top left and bottom right corners of the bounding box used to crop the image as a percentage of the total image size. Each argument should be in the range 0.0 to 1.0 inclusive.
        Parameters:
        leftX - X coordinate of the top left corner of the bounding box
        topY - Y coordinate of the top left corner of the bounding box
        rightX - X coordinate of the bottom right corner of the bounding box
        bottomY - Y coordinate of the bottom right corner of the bounding box
        Returns:
        a crop transform
        Throws:
        java.lang.IllegalArgumentException - If any of the arguments are outside the range 0.0 to 1.0 or if leftX >= rightX or topY >= bottomY.
      • makeCrop

        public static Transform makeCrop(double leftX,
                                         double topY,
                                         double rightX,
                                         double bottomY)
        Creates a transform that will crop an image to fit within the bounding box specified. The arguments define the top left and bottom right corners of the bounding box used to crop the image as a percentage of the total image size. Each argument should be in the range 0.0 to 1.0 inclusive.
        Parameters:
        leftX - X coordinate of the top left corner of the bounding box
        topY - Y coordinate of the top left corner of the bounding box
        rightX - X coordinate of the bottom right corner of the bounding box
        bottomY - Y coordinate of the bottom right corner of the bounding box
        Returns:
        a crop transform
        Throws:
        java.lang.IllegalArgumentException - If any of the arguments are outside the range 0.0 to 1.0 or if leftX >= rightX or topY >= bottomY.
      • makeVerticalFlip

        public static Transform makeVerticalFlip()
        Creates a transform that will vertically flip an image.
        Returns:
        a vertical flip transform
      • makeHorizontalFlip

        public static Transform makeHorizontalFlip()
        Creates a transform that will horizontally flip an image.
        Returns:
        a horizontal flip transform
      • makeRotate

        public static Transform makeRotate(int degrees)
        Creates a transform that rotates an image by degrees degrees clockwise.
        Parameters:
        degrees - The number of degrees by which to rotate. Must be a multiple of 90.
        Returns:
        a rotation transform
        Throws:
        java.lang.IllegalArgumentException - If degrees is not divisible by 90
      • makeImFeelingLucky

        public static Transform makeImFeelingLucky()
        Creates a transform that automatically adjust contrast and color levels. This is similar to the "I'm Feeling Lucky" button in Picasa.
        Returns:
        an ImFeelingLucky autolevel transform
      • makeCompositeTransform

        public static CompositeTransform makeCompositeTransform(java.util.Collection<Transform> transforms)
        Creates a composite transform that can represent multiple transforms applied in series.
        Parameters:
        transforms - Transforms for this composite transform to apply.
        Returns:
        a composite transform containing the provided transforms
      • makeCompositeTransform

        public static CompositeTransform makeCompositeTransform()
        Creates a composite transform that can represent multiple transforms applied in series.
        Returns:
        an empty composite transform
      • makeComposite

        public static Composite makeComposite(Image image,
                                              int xOffset,
                                              int yOffset,
                                              float opacity,
                                              Composite.Anchor anchor)
        Creates an image composition operation.
        Parameters:
        image - The image to be composited.
        xOffset - Offset in the x axis from the anchor point.
        yOffset - Offset in the y axis from the anchor point.
        opacity - Opacity to be used for the image in range [0.0, 1.0].
        anchor - Anchor position from the enum Composite.Anchor. The anchor position of the image is aligned with the anchor position of the canvas and then the offsets are applied.
        Returns:
        A composition operation.
        Throws:
        java.lang.IllegalArgumentException - If image is null or empty, xOffset or yOffset is outside the range [-4000, 4000], opacity is outside the range [0.0, 1.0] or anchor is null.

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