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-/**
- * Copyright 2009 Google Inc.
- *
- * 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.
- */
-
-import("blob");
-
-jimport("java.awt.image.BufferedImage");
-jimport("org.apache.sanselan.Sanselan");
-jimport("org.apache.sanselan.ImageFormat");
-
-if (java.lang.System.getProperty("java.awt.headless") == null) {
- // If the system property isn't set either way, then default to "headless" mode,
- // so that we don't start calling the window manager when the AWT classes
- // are loaded. For example, on OS X the java process is given a Dock icon
- // when we create our first BufferedImage.
- java.lang.System.setProperty("java.awt.headless", "true");
-}
-
-/**
- * Encodes the given pixel data into an image blob, ready to be served to
- * the client. Pixels are specified as 32-bit ints in the format AARRGGBB,
- * and the order is across rows first, then down columns. If useTransparency
- * is true, then all pixels should have an alpha channel as their
- * most-significant byte, with 0xff being fully opaque. If useTransparency
- * is false, all pixels are fully opaque and the high byte is ignored.
- * Supported formats: GIF.
- * <p>
- * For example, to create a GIF image consisting of a green pixel followed
- * by a transparent pixel to the right of it, use:
- * imageBlobFromPixels(2, 1, [0xff00ff00, 0x00000000], true, "gif")
- */
-
-function pixelsToImageBlob(width, height, pixelArrayARGB, useTransparency, format) {
- var image = _makeBufferedImage(width, height);
- var array = _makePixelArray(width, height);
- var alphaMask = (useTransparency ? 0x00000000 : 0xff000000);
-
- for(var i=0; i<array.length; i++) {
- // bitwise operations cause a JS number to become a signed 32-bit int
- array[i] = (pixelArrayARGB[i] | alphaMask);
- }
-
- _setImagePixels(image, array);
-
- if (format.toLowerCase() == "gif") {
- return _bufferedImage2gifBlob(image);
- }
- return null;
-}
-
-/**
- * Creates a blob of image data in a format readable by a web browser
- * that consists of a solid, opaque color and has the given width
- * and height. The sixHexDigits must be a number, such as
- * 0x12fda3, or a string, such as "12fda3".
- */
-function solidColorImageBlob(width, height, sixHexDigits) {
- var image = _makeBufferedImage(width, height);
- var array = _makePixelArray(width, height);
-
- var pixel = 0xffffff;
- if ((typeof sixHexDigits) == "number") {
- pixel = sixHexDigits;
- }
- else if ((typeof sixHexDigits) == "string") {
- pixel = Number("0x"+sixHexDigits);
- }
-
- // bitwise operations cause a JS number to become a signed 32-bit int
- pixel = ((pixel & 0xffffff) | 0xff000000);
-
- java.util.Arrays.fill(array, pixel);
- _setImagePixels(image, array);
-
- return _bufferedImage2gifBlob(image);
-}
-
-function _makeBufferedImage(width, height) {
- return new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
-}
-
-function _makePixelArray(width, height) {
- return java.lang.reflect.Array.newInstance(java.lang.Integer.TYPE,
- width*height);
-}
-
-function _setImagePixels(image, array) {
- var width = image.getWidth();
- var height = image.getHeight();
-
- image.setRGB(0, 0, width, height, array, 0, width);
-}
-
-function _bufferedImage2gifBlob(image) {
- // Use the Apache Sanselan image library because it nails transparent GIFs.
- var bytes = Sanselan.writeImageToBytes(image, ImageFormat.IMAGE_FORMAT_GIF, null);
- return blob.byteArrayToBlob("image/gif", bytes);
-}