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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ide.eclipse.adt.internal.editors.draw9patch.graphics;
import org.eclipse.swt.graphics.ImageData;
/**
* The utility class for SWT Image and ImageData manipulation.
*/
public class GraphicsUtilities {
/**
* Convert normal image to 9-patched.
* @return Returns 9-patched ImageData object. If image is null, returns null.
*/
public static ImageData convertToNinePatch(ImageData image) {
if (image == null) {
return null;
}
ImageData result = new ImageData(image.width + 2, image.height + 2, image.depth,
image.palette);
final int[] colors = new int[image.width];
final byte[] alpha = new byte[image.width];
for (int y = 0; y < image.height; y++) {
// Copy pixels
image.getPixels(0, y, image.width, colors, 0);
result.setPixels(1, y + 1, image.width, colors, 0);
// Copy alpha
image.getAlphas(0, y, image.width, alpha, 0);
result.setAlphas(1, y + 1, image.width, alpha, 0);
}
return result;
}
/**
* Wipe all color and alpha pixels.
*/
public static void clearImageData(ImageData imageData) {
if (imageData == null) {
throw new IllegalArgumentException("image data must not be null");
}
int width = imageData.width;
int height = imageData.height;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
imageData.setPixel(x, y, 0x00000000);
imageData.setAlpha(x, y, 0x00);
}
}
}
/**
* Duplicate the image data.
* @return If image is null, return null.
*/
public static ImageData copy(ImageData image) {
if (image == null) {
return null;
}
ImageData result = new ImageData(image.width, image.height, image.depth,
image.palette);
final int[] colors = new int[image.width];
final byte[] alpha = new byte[image.width];
for (int y = 0; y < image.height; y++) {
// Copy pixels
image.getPixels(0, y, image.width, colors, 0);
result.setPixels(0, y, image.width, colors, 0);
// Copy alpha
image.getAlphas(0, y, image.width, alpha, 0);
result.setAlphas(0, y, image.width, alpha, 0);
}
return result;
}
/**
* Get column pixels.
* @return length of obtained pixels.
*/
public static int getVerticalPixels(ImageData data, int x, int y, int height, int[] out) {
if (data == null) {
throw new IllegalArgumentException("data must not be null");
}
if (out == null) {
throw new IllegalArgumentException("out array must not be null");
}
if (height > out.length) {
throw new IllegalArgumentException("out array length must be > height");
}
if (data.height < (y + height)) {
throw new IllegalArgumentException("image height must be > (y + height)");
}
if (x < 0 || y < 0) {
throw new IllegalArgumentException("argument x, y must be >= 0");
}
if (x >= data.width) {
throw new IllegalArgumentException("argument x must be < data.width");
}
if (y >= data.height) {
throw new IllegalArgumentException("argument y must be < data.height");
}
if (height <= 0) {
throw new IllegalArgumentException("argument height must be > 0");
}
int idx = 0;
while (idx < height) {
data.getPixels(x, (y + idx), 1, out, idx);
idx++;
}
return idx;
}
/**
* Get row pixels.
*/
public static void getHorizontalPixels(ImageData data, int x, int y, int width, int[] out) {
if (data == null) {
throw new IllegalArgumentException("data must not be null");
}
if (out == null) {
throw new IllegalArgumentException("out array must not be null");
}
if (width > out.length) {
throw new IllegalArgumentException("out array length must be > width");
}
if (data.width < (x + width)) {
throw new IllegalArgumentException("image height must be > (x + width)");
}
if (x < 0 || y < 0) {
throw new IllegalArgumentException("argument x, y must be >= 0");
}
if (x >= data.width) {
throw new IllegalArgumentException("argument x must be < data.width");
}
if (y >= data.height) {
throw new IllegalArgumentException("argument y must be < data.height");
}
if (width <= 0) {
throw new IllegalArgumentException("argument width must be > 0");
}
data.getPixels(x, y, width, out, 0);
}
}
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