ImagesService (Google App Engine API for Java)

com.google.appengine.api.images

Interface ImagesService



  • public interface ImagesService
    The images service provides methods to apply transformations to images.
    • Field Detail

      • MAX_TRANSFORMS_PER_REQUEST

        static final int MAX_TRANSFORMS_PER_REQUEST
        See Also:
        Constant Field Values
      • MAX_COMPOSITES_PER_REQUEST

        static final int MAX_COMPOSITES_PER_REQUEST
        See Also:
        Constant Field Values
      • SERVING_SIZES

        @Deprecated
        static final java.util.Set<java.lang.Integer> SERVING_SIZES
        Deprecated. 
      • SERVING_CROP_SIZES

        @Deprecated
        static final java.util.Set<java.lang.Integer> SERVING_CROP_SIZES
        Deprecated. 
    • Method Detail

      • applyTransform

        Image applyTransform(Transform transform,
                             Image image)
        Applies the provided transform to the provided image encoding the transformed image stored using PNG file format. The transform is applied in place to the provided image.
        Parameters:
        transform - transform to be applied
        image - image to be transformed
        Returns:
        transformed image
        Throws:
        java.lang.IllegalArgumentException - If transform or image are invalid.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • applyTransformAsync

        java.util.concurrent.Future<Image> applyTransformAsync(Transform transform,
                                                               Image image)
        Asynchronously applies the provided transform to the provided image encoding the transformed image stored using PNG file format. The transform is applied in place to the provided image.
        Parameters:
        transform - transform to be applied
        image - image to be transformed
        Returns:
        A future containing the transformed image or one of the exceptions documented for applyTransform(Transform, Image).
      • applyTransform

        Image applyTransform(Transform transform,
                             Image image,
                             ImagesService.OutputEncoding encoding)
        Applies the provided transform to the provided image encoding the transformed image stored using encoding file format. The transform is applied in place to the provided image.
        Parameters:
        transform - transform to be applied
        image - image to be transformed
        encoding - output encoding to be used
        Returns:
        transformed image
        Throws:
        java.lang.IllegalArgumentException - If transform, image or encoding are invalid.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • applyTransformAsync

        java.util.concurrent.Future<Image> applyTransformAsync(Transform transform,
                                                               Image image,
                                                               ImagesService.OutputEncoding encoding)
        Asynchronously applies the provided transform to the provided image encoding the transformed image stored using encoding file format. The transform is applied in place to the provided image.
        Parameters:
        transform - transform to be applied
        image - image to be transformed
        encoding - output encoding to be used
        Returns:
        A future containing the transformed image or one of the exceptions documented for applyTransform(Transform, Image, OutputEncoding).
      • applyTransform

        Image applyTransform(Transform transform,
                             Image image,
                             OutputSettings settings)
        Applies the provided transform to the provided image encoding the transformed image stored using settings. The transform is applied in place to the provided image.
        Parameters:
        transform - transform to be applied
        image - image to be transformed
        settings - output settings to be used
        Returns:
        transformed image
        Throws:
        java.lang.IllegalArgumentException - If transform, image or settings are invalid.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • applyTransformAsync

        java.util.concurrent.Future<Image> applyTransformAsync(Transform transform,
                                                               Image image,
                                                               OutputSettings settings)
        Asynchronously applies the provided transform to the provided image encoding the transformed image stored using settings. The transform is applied in place to the provided image.
        Parameters:
        transform - transform to be applied
        image - image to be transformed
        settings - output settings to be used
        Returns:
        A future containing the transformed image or one of the exceptions documented for applyTransform(Transform, Image, OutputSettings).
      • applyTransform

        Image applyTransform(Transform transform,
                             Image image,
                             InputSettings inputSettings,
                             OutputSettings outputSettings)
        Applies the provided transform to the provided image encoding the transformed image stored using outputSettings interpreting image according to inputSettings. The transform is applied in place to the provided image.
        Parameters:
        transform - transform to be applied
        image - image to be transformed
        inputSettings - input settings to be used
        outputSettings - output settings to be used
        Returns:
        transformed image
        Throws:
        java.lang.IllegalArgumentException - If transform, image, inputSettings or outputSettings are invalid.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • applyTransformAsync

        java.util.concurrent.Future<Image> applyTransformAsync(Transform transform,
                                                               Image image,
                                                               InputSettings inputSettings,
                                                               OutputSettings outputSettings)
        Asynchronously applies the provided transform to the provided image encoding the transformed image stored using settings interpreting image according to inputSettings. The transform is applied in place to the provided image.
        Parameters:
        transform - transform to be applied
        image - image to be transformed
        inputSettings - input settings to be used
        outputSettings - output settings to be used
        Returns:
        A future containing the transformed image or one of the exceptions documented for applyTransform(Transform, Image, InputSettings, OutputSettings).
      • composite

        Image composite(java.util.Collection<Composite> composites,
                        int width,
                        int height,
                        long color)
        Applies the provided Collection of Composites using a canvas with dimensions determined by width and height and background color color. Uses PNG as its output encoding.
        Parameters:
        composites - Compositing operations to be applied.
        width - Width of the canvas in pixels.
        height - Height of the canvas in pixels.
        color - Background color of the canvas in ARGB format.
        Returns:
        A new image containing the result of composition.
        Throws:
        java.lang.IllegalArgumentException - If width or height is greater than 4000, color is outside the range [0, 0xffffffff], composites contains more than 16 elements or something is wrong with the contents of composites.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • composite

        Image composite(java.util.Collection<Composite> composites,
                        int width,
                        int height,
                        long color,
                        ImagesService.OutputEncoding encoding)
        Applies the provided Collection of Composites using a canvas with dimensions determined by width and height and background color color.
        Parameters:
        composites - Compositing operations to be applied.
        width - Width of the canvas in pixels.
        height - Height of the canvas in pixels.
        color - Background color of the canvas in ARGB format.
        encoding - Encoding to be used for the resulting image.
        Returns:
        A new image containing the result of composition.
        Throws:
        java.lang.IllegalArgumentException - If width or height is greater than 4000, color is outside the range [0, 0xffffffff], composites contains more than 16 elements or something is wrong with the contents of composites.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • composite

        Image composite(java.util.Collection<Composite> composites,
                        int width,
                        int height,
                        long color,
                        OutputSettings settings)
        Applies the provided Collection of Composites using a canvas with dimensions determined by width and height and background color color.
        Parameters:
        composites - Compositing operations to be applied.
        width - Width of the canvas in pixels.
        height - Height of the canvas in pixels.
        color - Background color of the canvas in ARGB format.
        settings - OutputSettings to be used for the resulting image.
        Returns:
        A new image containing the result of composition.
        Throws:
        java.lang.IllegalArgumentException - If width or height is greater than 4000, color is outside the range [0, 0xffffffff], composites contains more than 16 elements or something is wrong with the contents of composites.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • histogram

        int[][] histogram(Image image)
        Calculates the histogram of the image.
        Parameters:
        image - image for which to calculate a histogram
        Returns:
        An array of 3 arrays of length 256, each containing the image histogram for one color channel. The channels are ordered RGB from entry 0 to 3. Each channel ranges from 0 where the color is not present to 255 where the color is fully bright.
      • getServingUrl

        @Deprecated
        java.lang.String getServingUrl(BlobKey blobKey)
        Deprecated. Replaced by getServingUrl(ServingUrlOptions).
        Obtains a URL that can serve the image stored as a blob dynamically.

        This URL is served by a high-performance dynamic image serving infrastructure that is available globally. The URL returned by this method is always public, but not guessable; private URLs are not currently supported. If you wish to stop serving the URL, delete the underlying blob key. This takes up to 24 hours to take effect. The URL format also allows dynamic resizing and crop with certain restrictions. To get dynamic resizing and cropping simply append options to the end of the url obtained via this call. Here is an example: getServingUrl -> "http://lh3.ggpht.com/SomeCharactersGoesHere"

        To get a 32 pixel sized version (aspect-ratio preserved) simply append "=s32" to the url: "http://lh3.ggpht.com/SomeCharactersGoesHere=s32"

        To get a 32 pixel cropped version simply append "=s32-c": "http://lh3.ggpht.com/SomeCharactersGoesHere=s32-c"

        Valid sizes are any integer in the range [0, 1600] and is available as SERVING_SIZES_LIMIT.

        Parameters:
        blobKey - blob key of the image to serve by the returned URL.
        Returns:
        a URL that can serve the image dynamically.
        Throws:
        java.lang.IllegalArgumentException - If blob key is not valid or doesn't contain an image.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • getServingUrl

        @Deprecated
        java.lang.String getServingUrl(BlobKey blobKey,
                                                   boolean secureUrl)
        Deprecated. Replaced by getServingUrl(ServingUrlOptions).
        Obtains a URL that can serve the image stored as a blob dynamically.

        This URL is served by a high-performance dynamic image serving infrastructure that is available globally. The URL returned by this method is always public, but not guessable; private URLs are not currently supported. If you wish to stop serving the URL, delete the underlying blob key. This takes up to 24 hours to take effect. The URL format also allows dynamic resizing and crop with certain restrictions. To get dynamic resizing and cropping simply append options to the end of the url obtained via this call. Here is an example: getServingUrl -> "http://lh3.ggpht.com/SomeCharactersGoesHere"

        To get a 32 pixel sized version (aspect-ratio preserved) simply append "=s32" to the url: "http://lh3.ggpht.com/SomeCharactersGoesHere=s32"

        To get a 32 pixel cropped version simply append "=s32-c": "http://lh3.ggpht.com/SomeCharactersGoesHere=s32-c"

        Valid sizes are any integer in the range [0, 1600] and is available as SERVING_SIZES_LIMIT.

        Parameters:
        blobKey - blob key of the image to serve by the returned URL.
        secureUrl - controls if the url scheme should be https or http.
        Returns:
        a URL that can serve the image dynamically.
        Throws:
        java.lang.IllegalArgumentException - If blob key is not valid or doesn't contain an image.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • getServingUrl

        @Deprecated
        java.lang.String getServingUrl(BlobKey blobKey,
                                                   int imageSize,
                                                   boolean crop)
        Deprecated. Replaced by getServingUrl(ServingUrlOptions).
        Calculates the serving URL for specific size and crop parameters from generic URL returned by getServingUrl(BlobKey).
        Parameters:
        blobKey - blob key of the image to serve by the returned URL with specified size and crop.
        imageSize - size of the served image in pixels.
        crop - controls whether the image should be resized or cropped.
        Returns:
        a URL that can serve the image dynamically.
        Throws:
        java.lang.IllegalArgumentException - If blob key is not valid or doesn't contain an image or specified size is not supported by the service.
        ImagesServiceFailureException - If there is a problem with the Images Service
        See Also:
        getServingUrl(BlobKey)
      • getServingUrl

        @Deprecated
        java.lang.String getServingUrl(BlobKey blobKey,
                                                   int imageSize,
                                                   boolean crop,
                                                   boolean secureUrl)
        Deprecated. Replaced by getServingUrl(ServingUrlOptions).
        Calculates the serving URL for specific size and crop parameters from generic URL returned by getServingUrl(BlobKey).
        Parameters:
        blobKey - blob key of the image to serve by the returned URL with specified size and crop.
        imageSize - size of the served image in pixels.
        crop - controls whether the image should be resized or cropped.
        secureUrl - controls if the url scheme should be https or http.
        Returns:
        a URL that can serve the image dynamically.
        Throws:
        java.lang.IllegalArgumentException - If blob key is not valid or doesn't contain an image or specified size is not supported by the service.
        ImagesServiceFailureException - If there is a problem with the Images Service
        See Also:
        getServingUrl(BlobKey)
      • getServingUrl

        java.lang.String getServingUrl(ServingUrlOptions options)
        Obtains a URL that can dynamically serve the image stored as a blob.

        This URL is served by a high-performance dynamic image serving infrastructure that is available globally. The URL returned by this method is always public, but not guessable; private URLs are not currently supported. If you wish to stop serving the URL, delete the underlying blob key. This takes up to 24 hours to take effect. The URL format also allows dynamic resizing and crop with certain restrictions. To get dynamic resizing and cropping simply append options to the end of the url obtained via this call. Here is an example: getServingUrl -> "http://lh3.ggpht.com/SomeCharactersGoesHere"

        To get a 32 pixel sized version (aspect-ratio preserved) simply append "=s32" to the url: "http://lh3.ggpht.com/SomeCharactersGoesHere=s32"

        To get a 32 pixel cropped version simply append "=s32-c": "http://lh3.ggpht.com/SomeCharactersGoesHere=s32-c"

        Valid sizes are any integer in the range [0, 1600] (maximum is available as SERVING_SIZES_LIMIT).

        Parameters:
        options - Specific options for generating the serving URL.
        Returns:
        a URL that can serve the image dynamically.
        Throws:
        java.lang.IllegalArgumentException - If options does not contain a valid blobKey or googleStorageFileName.
        ImagesServiceFailureException - If there is a problem with the Images Service
      • deleteServingUrl

        void deleteServingUrl(BlobKey blobKey)
        Deletes a URL that was previously generated by getServingUrl(BlobKey).
        Parameters:
        blobKey - blob key that was previously used in the call to create the serving URL.
        Throws:
        java.lang.IllegalArgumentException - If blob key is not valid.

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