moved java files for pre-convert

java_test/java/com/google/zxing/BufferedImageLuminanceSource.java

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+/*
+ * Copyright 2009 ZXing authors
+ *
+ * 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.google.zxing;
+
+import java.awt.Graphics2D;
+import java.awt.geom.AffineTransform;
+import java.awt.image.BufferedImage;
+import java.awt.image.WritableRaster;
+
+/**
+ * This LuminanceSource implementation is meant for J2SE clients and our blackbox unit tests.
+ *
+ * @author dswitkin@google.com (Daniel Switkin)
+ * @author Sean Owen
+ * @author code@elektrowolle.de (Wolfgang Jung)
+ */
+public final class BufferedImageLuminanceSource extends LuminanceSource {
+
+  private static final double MINUS_45_IN_RADIANS = -0.7853981633974483; // Math.toRadians(-45.0)
+
+  private final BufferedImage image;
+  private final int left;
+  private final int top;
+
+  public BufferedImageLuminanceSource(BufferedImage image) {
+    this(image, 0, 0, image.getWidth(), image.getHeight());
+  }
+
+  public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
+    super(width, height);
+
+    if (image.getType() == BufferedImage.TYPE_BYTE_GRAY) {
+      this.image = image;
+    } else {
+      int sourceWidth = image.getWidth();
+      int sourceHeight = image.getHeight();
+      if (left + width > sourceWidth || top + height > sourceHeight) {
+        throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
+      }
+
+      this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
+
+      WritableRaster raster = this.image.getRaster();
+      int[] buffer = new int[width];
+      for (int y = top; y < top + height; y++) {
+        image.getRGB(left, y, width, 1, buffer, 0, sourceWidth);
+        for (int x = 0; x < width; x++) {
+          int pixel = buffer[x];
+
+          // The color of fully-transparent pixels is irrelevant. They are often, technically, fully-transparent
+          // black (0 alpha, and then 0 RGB). They are often used, of course as the "white" area in a
+          // barcode image. Force any such pixel to be white:
+          if ((pixel & 0xFF000000) == 0) {
+            // white, so we know its luminance is 255
+            buffer[x] = 0xFF;
+          } else {
+            // .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC),
+            // (306*R) >> 10 is approximately equal to R*0.299, and so on.
+            // 0x200 >> 10 is 0.5, it implements rounding.
+            buffer[x] =
+              (306 * ((pixel >> 16) & 0xFF) +
+                601 * ((pixel >> 8) & 0xFF) +
+                117 * (pixel & 0xFF) +
+                0x200) >> 10;
+          }
+        }
+        raster.setPixels(left, y, width, 1, buffer);
+      }
+
+    }
+    this.left = left;
+    this.top = top;
+  }
+
+  @Override
+  public byte[] getRow(int y, byte[] row) {
+    if (y < 0 || y >= getHeight()) {
+      throw new IllegalArgumentException("Requested row is outside the image: " + y);
+    }
+    int width = getWidth();
+    if (row == null || row.length < width) {
+      row = new byte[width];
+    }
+    // The underlying raster of image consists of bytes with the luminance values
+    image.getRaster().getDataElements(left, top + y, width, 1, row);
+    return row;
+  }
+
+  @Override
+  public byte[] getMatrix() {
+    int width = getWidth();
+    int height = getHeight();
+    int area = width * height;
+    byte[] matrix = new byte[area];
+    // The underlying raster of image consists of area bytes with the luminance values
+    image.getRaster().getDataElements(left, top, width, height, matrix);
+    return matrix;
+  }
+
+  @Override
+  public boolean isCropSupported() {
+    return true;
+  }
+
+  @Override
+  public LuminanceSource crop(int left, int top, int width, int height) {
+    return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
+  }
+
+  /**
+   * This is always true, since the image is a gray-scale image.
+   *
+   * @return true
+   */
+  @Override
+  public boolean isRotateSupported() {
+    return true;
+  }
+
+  @Override
+  public LuminanceSource rotateCounterClockwise() {
+    int sourceWidth = image.getWidth();
+    int sourceHeight = image.getHeight();
+
+    // Rotate 90 degrees counterclockwise.
+    AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
+
+    // Note width/height are flipped since we are rotating 90 degrees.
+    BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
+
+    // Draw the original image into rotated, via transformation
+    Graphics2D g = rotatedImage.createGraphics();
+    g.drawImage(image, transform, null);
+    g.dispose();
+
+    // Maintain the cropped region, but rotate it too.
+    int width = getWidth();
+    return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
+  }
+
+  @Override
+  public LuminanceSource rotateCounterClockwise45() {
+    int width = getWidth();
+    int height = getHeight();
+
+    int oldCenterX = left + width / 2;
+    int oldCenterY = top + height / 2;
+
+    // Rotate 45 degrees counterclockwise.
+    AffineTransform transform = AffineTransform.getRotateInstance(MINUS_45_IN_RADIANS, oldCenterX, oldCenterY);
+
+    int sourceDimension = Math.max(image.getWidth(), image.getHeight());
+    BufferedImage rotatedImage = new BufferedImage(sourceDimension, sourceDimension, BufferedImage.TYPE_BYTE_GRAY);
+
+    // Draw the original image into rotated, via transformation
+    Graphics2D g = rotatedImage.createGraphics();
+    g.drawImage(image, transform, null);
+    g.dispose();
+
+    int halfDimension = Math.max(width, height) / 2;
+    int newLeft = Math.max(0, oldCenterX - halfDimension);
+    int newTop = Math.max(0, oldCenterY - halfDimension);
+    int newRight = Math.min(sourceDimension - 1, oldCenterX + halfDimension);
+    int newBottom = Math.min(sourceDimension - 1, oldCenterY + halfDimension);
+
+    return new BufferedImageLuminanceSource(rotatedImage, newLeft, newTop, newRight - newLeft, newBottom - newTop);
+  }
+
+}