X-Git-Url: http://git.nikiroo.be/?p=fanfix.git;a=blobdiff_plain;f=src%2Fbe%2Fnikiroo%2Futils%2FImageUtils.java;fp=src%2Fbe%2Fnikiroo%2Futils%2FImageUtils.java;h=fb869294f2029bd1c0fd7f4a64680259ca4bc4b0;hp=0000000000000000000000000000000000000000;hb=d46b7b96f94e88a776bcd2dfd756549ffb300cc9;hpb=c9994f27667bc421bcd448d39e55774fddf5c431

diff --git a/src/be/nikiroo/utils/ImageUtils.java b/src/be/nikiroo/utils/ImageUtils.java
new file mode 100644
index 0000000..fb86929
--- /dev/null
+++ b/src/be/nikiroo/utils/ImageUtils.java
@@ -0,0 +1,220 @@
+package be.nikiroo.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+
+import be.nikiroo.utils.serial.SerialUtils;
+
+/**
+ * This class offer some utilities based around images.
+ * 
+ * @author niki
+ */
+public abstract class ImageUtils {
+	private static ImageUtils instance = newObject();
+
+	/**
+	 * Get a (unique) instance of an {@link ImageUtils} compatible with your
+	 * system.
+	 * 
+	 * @return an {@link ImageUtils}
+	 */
+	public static ImageUtils getInstance() {
+		return instance;
+	}
+
+	/**
+	 * Save the given resource as an image on disk using the given image format
+	 * for content, or with "png" format if it fails.
+	 * 
+	 * @param img
+	 *            the resource
+	 * @param target
+	 *            the target file
+	 * @param format
+	 *            the file format ("png", "jpeg", "bmp"...)
+	 * 
+	 * @throws IOException
+	 *             in case of I/O error
+	 */
+	public abstract void saveAsImage(Image img, File target, String format)
+			throws IOException;
+
+	/**
+	 * Return the EXIF transformation flag of this image if any.
+	 * 
+	 * <p>
+	 * Note: this code has been found on internet; thank you anonymous coder.
+	 * </p>
+	 * 
+	 * @param in
+	 *            the data {@link InputStream}
+	 * 
+	 * @return the transformation flag if any
+	 * 
+	 * @throws IOException
+	 *             in case of IO error
+	 */
+	protected static int getExifTransorm(InputStream in) throws IOException {
+		int[] exif_data = new int[100];
+		int set_flag = 0;
+		int is_motorola = 0;
+
+		/* Read File head, check for JPEG SOI + Exif APP1 */
+		for (int i = 0; i < 4; i++)
+			exif_data[i] = in.read();
+
+		if (exif_data[0] != 0xFF || exif_data[1] != 0xD8
+				|| exif_data[2] != 0xFF || exif_data[3] != 0xE1)
+			return -2;
+
+		/* Get the marker parameter length count */
+		int length = (in.read() << 8 | in.read());
+
+		/* Length includes itself, so must be at least 2 */
+		/* Following Exif data length must be at least 6 */
+		if (length < 8)
+			return -1;
+		length -= 8;
+		/* Read Exif head, check for "Exif" */
+		for (int i = 0; i < 6; i++)
+			exif_data[i] = in.read();
+
+		if (exif_data[0] != 0x45 || exif_data[1] != 0x78
+				|| exif_data[2] != 0x69 || exif_data[3] != 0x66
+				|| exif_data[4] != 0 || exif_data[5] != 0)
+			return -1;
+
+		/* Read Exif body */
+		length = length > exif_data.length ? exif_data.length : length;
+		for (int i = 0; i < length; i++)
+			exif_data[i] = in.read();
+
+		if (length < 12)
+			return -1; /* Length of an IFD entry */
+
+		/* Discover byte order */
+		if (exif_data[0] == 0x49 && exif_data[1] == 0x49)
+			is_motorola = 0;
+		else if (exif_data[0] == 0x4D && exif_data[1] == 0x4D)
+			is_motorola = 1;
+		else
+			return -1;
+
+		/* Check Tag Mark */
+		if (is_motorola == 1) {
+			if (exif_data[2] != 0)
+				return -1;
+			if (exif_data[3] != 0x2A)
+				return -1;
+		} else {
+			if (exif_data[3] != 0)
+				return -1;
+			if (exif_data[2] != 0x2A)
+				return -1;
+		}
+
+		/* Get first IFD offset (offset to IFD0) */
+		int offset;
+		if (is_motorola == 1) {
+			if (exif_data[4] != 0)
+				return -1;
+			if (exif_data[5] != 0)
+				return -1;
+			offset = exif_data[6];
+			offset <<= 8;
+			offset += exif_data[7];
+		} else {
+			if (exif_data[7] != 0)
+				return -1;
+			if (exif_data[6] != 0)
+				return -1;
+			offset = exif_data[5];
+			offset <<= 8;
+			offset += exif_data[4];
+		}
+		if (offset > length - 2)
+			return -1; /* check end of data segment */
+
+		/* Get the number of directory entries contained in this IFD */
+		int number_of_tags;
+		if (is_motorola == 1) {
+			number_of_tags = exif_data[offset];
+			number_of_tags <<= 8;
+			number_of_tags += exif_data[offset + 1];
+		} else {
+			number_of_tags = exif_data[offset + 1];
+			number_of_tags <<= 8;
+			number_of_tags += exif_data[offset];
+		}
+		if (number_of_tags == 0)
+			return -1;
+		offset += 2;
+
+		/* Search for Orientation Tag in IFD0 */
+		for (;;) {
+			if (offset > length - 12)
+				return -1; /* check end of data segment */
+			/* Get Tag number */
+			int tagnum;
+			if (is_motorola == 1) {
+				tagnum = exif_data[offset];
+				tagnum <<= 8;
+				tagnum += exif_data[offset + 1];
+			} else {
+				tagnum = exif_data[offset + 1];
+				tagnum <<= 8;
+				tagnum += exif_data[offset];
+			}
+			if (tagnum == 0x0112)
+				break; /* found Orientation Tag */
+			if (--number_of_tags == 0)
+				return -1;
+			offset += 12;
+		}
+
+		/* Get the Orientation value */
+		if (is_motorola == 1) {
+			if (exif_data[offset + 8] != 0)
+				return -1;
+			set_flag = exif_data[offset + 9];
+		} else {
+			if (exif_data[offset + 9] != 0)
+				return -1;
+			set_flag = exif_data[offset + 8];
+		}
+		if (set_flag > 8)
+			return -1;
+
+		return set_flag;
+	}
+
+	/**
+	 * Check that the class can operate (for instance, that all the required
+	 * libraries or frameworks are present).
+	 * 
+	 * @return TRUE if it works
+	 */
+	abstract protected boolean check();
+
+	/**
+	 * Create a new {@link ImageUtils}.
+	 * 
+	 * @return the {@link ImageUtils}
+	 */
+	private static ImageUtils newObject() {
+		for (String clazz : new String[] { "be.nikiroo.utils.ui.ImageUtilsAwt",
+				"be.nikiroo.utils.android.ImageUtilsAndroid" }) {
+			try {
+				ImageUtils obj = (ImageUtils) SerialUtils.createObject(clazz);
+				if (obj.check()) {
+					return obj;
+				}
+			} catch (Throwable e) {
+			}
+		}
+
+		return null;
+	}
+}