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/*
* Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package javafx.scene.image;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import javafx.scene.paint.Color;
/**
* This interface defines methods for retrieving the pixel data from an
* {@link Image} or other surface containing pixels.
* @since JavaFX 2.2
*/
public interface PixelReader {
/**
* This method returns the {@code PixelFormat} in which the surface
* stores its pixels, or a roughly equivalent pixel format into which
* it can easily convert its pixels for purposes of reading them.
*
* @return the {@code PixelFormat} that best describes the underlying
* pixels
*/
public PixelFormat getPixelFormat();
/**
* Reads a 32-bit integer representation of the color of a pixel
* from the specified coordinates in the surface.
* The 32-bit integer will contain the 4 color components in separate
* 8-bit fields in ARGB order from the most significant byte to the least
* significant byte.
*
* @param x the X coordinate of the pixel color to read
* @param y the Y coordinate of the pixel color to read
* @return a 32-bit representation of the color in the format
* described by the {@link PixelFormat.Type#INT_ARGB INT_ARGB}
* PixelFormat type.
*/
public int getArgb(int x, int y);
/**
* Reads the color of a pixel from the specified coordinates in the
* surface and returns the value as a {@link Color} object.
*
* @param x the X coordinate of the pixel color to read
* @param y the Y coordinate of the pixel color to read
* @return the Color object representing the color of the indicated
* pixel
*/
public Color getColor(int x, int y);
/**
* Reads pixel data from a rectangular region of the surface into the
* specified buffer.
* The format to be used for pixels in the buffer is defined by the
* {@link PixelFormat} object and pixel format conversions will be
* performed as needed to store the data in the indicated format.
* The buffer is assumed to be positioned to the location where the
* first pixel data from the image pixel at location {@code (x, y)}
* will be stored.
* Pixel data for a row will be stored in adjacent locations within
* the buffer packed as tightly as possible for increasing X
* coordinates.
* Pixel data for adjacent rows will be stored offset from each other
* by the number of buffer data elements defined by
* {@code scanlineStride}.
*
* @param the type of the buffer
* @param x the X coordinate of the rectangular region to read
* @param y the Y coordinate of the rectangular region to read
* @param w the width of the rectangular region to read
* @param h the height of the rectangular region to read
* @param pixelformat the {@code PixelFormat} object defining the format
* to store the pixels into buffer
* @param buffer a buffer of a type appropriate for the indicated
* {@code PixelFormat} object
* @param scanlineStride the distance between the pixel data for the
* start of one row of data in the buffer to the start of the
* next row of data.
*/
public
void getPixels(int x, int y, int w, int h,
WritablePixelFormat pixelformat,
T buffer, int scanlineStride);
/**
* Reads pixel data from a rectangular region of the surface into the
* specified byte array.
* The format to be used for pixels in the buffer is defined by the
* {@link PixelFormat} object and pixel format conversions will be
* performed as needed to store the data in the indicated format.
* The {@code pixelformat} must be a compatible
* {@code PixelFormat} type.
* The data for the first pixel at location {@code (x, y)} will be
* read into the array index specified by the {@code offset} parameter.
* Pixel data for a row will be stored in adjacent locations within
* the array packed as tightly as possible for increasing X
* coordinates.
* Pixel data for adjacent rows will be stored offset from each other
* by the number of byte array elements defined by
* {@code scanlineStride}.
*
* @param x the X coordinate of the rectangular region to read
* @param y the Y coordinate of the rectangular region to read
* @param w the width of the rectangular region to read
* @param h the height of the rectangular region to read
* @param pixelformat the {@code PixelFormat} object
* defining the byte format to store the pixels into buffer
* @param buffer a byte array to store the returned pixel data
* @param offset the offset into {@code buffer} to store the first
* pixel data
* @param scanlineStride the distance between the pixel data for the
* start of one row of data in the buffer to the start of the
* next row of data
*/
public void getPixels(int x, int y, int w, int h,
WritablePixelFormat pixelformat,
byte buffer[], int offset, int scanlineStride);
/**
* Reads pixel data from a rectangular region of the surface into the
* specified int array.
* The format to be used for pixels in the buffer is defined by the
* {@link PixelFormat} object and pixel format conversions will be
* performed as needed to store the data in the indicated format.
* The {@code pixelformat} must be a compatible
* {@code PixelFormat} type.
* The data for the first pixel at location {@code (x, y)} will be
* read into the array index specified by the {@code offset} parameter.
* Pixel data for a row will be stored in adjacent locations within
* the array packed as tightly as possible for increasing X
* coordinates.
* Pixel data for adjacent rows will be stored offset from each other
* by the number of int array elements defined by
* {@code scanlineStride}.
*
* @param x the X coordinate of the rectangular region to read
* @param y the Y coordinate of the rectangular region to read
* @param w the width of the rectangular region to read
* @param h the height of the rectangular region to read
* @param pixelformat the {@code PixelFormat} object
* defining the int format to store the pixels into buffer
* @param buffer a int array to store the returned pixel data
* @param offset the offset into {@code buffer} to store the first
* pixel data
* @param scanlineStride the distance between the pixel data for the
* start of one row of data in the buffer to the start of the
* next row of data
*/
public void getPixels(int x, int y, int w, int h,
WritablePixelFormat pixelformat,
int buffer[], int offset, int scanlineStride);
}
