* based on a region of a {@link BufferedImage}; see
* {@link #BufferedImageMonochromeBitmapSource(BufferedImage, int, int, int, int)}.</p>
*
- * @author srowen@google.com (Sean Owen), Daniel Switkin (dswitkin@google.com)
+ * @author Sean Owen
+ * @author Daniel Switkin (dswitkin@google.com)
*/
public final class BufferedImageMonochromeBitmapSource extends BaseMonochromeBitmapSource {
private final BufferedImage image;
private final int left;
private final int top;
- private final int width;
- private final int height;
- private int[] rgbRow;
- private int[] rgbColumn;
- private int cachedRow;
- private int cachedColumn;
/**
* Creates an instance that uses the entire given image as a source of pixels to decode.
*/
public BufferedImageMonochromeBitmapSource(BufferedImage image) {
this(image, 0, 0, image.getWidth(), image.getHeight());
- rgbRow = new int[image.getWidth()];
- cachedRow = -1;
}
/**
* @param image image to decode a region of
* @param left x coordinate of leftmost pixels to decode
* @param top y coordinate of topmost pixels to decode
- * @param right one more than the x coordinate of rightmost pixels to decode. That is, we will decode
+ * @param right one more than the x coordinate of rightmost pixels to decode, i.e. we will decode
* pixels whose x coordinate is in [left,right)
* @param bottom likewise, one more than the y coordinate of the bottommost pixels to decode
*/
- public BufferedImageMonochromeBitmapSource(BufferedImage image, int left, int top, int right, int bottom) {
+ public BufferedImageMonochromeBitmapSource(BufferedImage image, int left, int top, int right,
+ int bottom) {
+ super(right - left, bottom - top);
this.image = image;
int sourceHeight = image.getHeight();
int sourceWidth = image.getWidth();
- if (left < 0 || top < 0 || right > sourceWidth || bottom > sourceHeight || right <= left || bottom <= top) {
- throw new IllegalArgumentException("Invalid bounds: (" + top + ',' + left + ") (" + right + ',' + bottom + ')');
+ if (left < 0 || top < 0 || right > sourceWidth || bottom > sourceHeight || right <= left ||
+ bottom <= top) {
+ throw new IllegalArgumentException("Invalid bounds: (" + top + ',' + left + ") (" + right +
+ ',' + bottom + ')');
}
this.left = left;
this.top = top;
- this.width = right - left;
- this.height = bottom - top;
- rgbRow = new int[width];
- rgbColumn = new int[height];
- cachedRow = -1;
- cachedColumn = -1;
}
/**
* @return underlying {@link BufferedImage} behind this instance. Note that even if this instance
- * only uses a subset of the full image, the returned value here represents the entire backing image.
+ * only uses a subset of the full image, the returned value here represents the entire backing
+ * image.
*/
public BufferedImage getImage() {
return image;
}
- public int getHeight() {
- return height;
- }
-
- public int getWidth() {
- return width;
- }
-
@Override
public MonochromeBitmapSource rotateCounterClockwise() {
if (!isRotateSupported()) {
}
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
+
// 90 degrees counterclockwise:
AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
BufferedImageOp op = new AffineTransformOp(transform, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
+
// Note width/height are flipped since we are rotating 90 degrees:
BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, image.getType());
op.filter(image, rotatedImage);
return new BufferedImageMonochromeBitmapSource(rotatedImage,
top,
- sourceWidth - (left + width),
- top + height,
+ sourceWidth - (left + getWidth()),
+ top + getHeight(),
sourceWidth - left);
}
*
* where R, G, and B are values in [0,1].
*/
- public int getLuminance(int x, int y) {
- int pixel;
- if (cachedRow == y) {
- pixel = rgbRow[x];
- } else if (cachedColumn == x) {
- pixel = rgbColumn[y];
- } else {
- pixel = image.getRGB(left + x, top + y);
- }
-
+ @Override
+ protected int getLuminance(int x, int y) {
+ int pixel = image.getRGB(left + x, top + y);
// Coefficients add up to 1024 to make the divide into a fast shift
return (306 * ((pixel >> 16) & 0xFF) +
601 * ((pixel >> 8) & 0xFF) +
117 * (pixel & 0xFF)) >> 10;
}
- public void cacheRowForLuminance(int y) {
- if (y != cachedRow) {
- image.getRGB(left, top + y, width, 1, rgbRow, 0, width);
- cachedRow = y;
+ @Override
+ protected int[] getLuminanceRow(int y, int[] row) {
+ int width = getWidth();
+ if (row == null || row.length < width) {
+ row = new int[width];
}
+ image.getRGB(left, top + y, width, 1, row, 0, width);
+ for (int x = 0; x < width; x++) {
+ int pixel = row[x];
+ row[x] = (306 * ((pixel >> 16) & 0xFF) +
+ 601 * ((pixel >> 8) & 0xFF) +
+ 117 * (pixel & 0xFF)) >> 10;
+ }
+ return row;
}
- public void cacheColumnForLuminance(int x) {
- if (x != cachedColumn) {
- image.getRGB(left + x, top, 1, height, rgbColumn, 0, 1);
- cachedColumn = x;
+ @Override
+ protected int[] getLuminanceColumn(int x, int[] column) {
+ int height = getHeight();
+ if (column == null || column.length < height) {
+ column = new int[height];
+ }
+ image.getRGB(left + x, top, 1, height, column, 0, 1);
+ for (int y = 0; y < height; y++) {
+ int pixel = column[y];
+ column[y] = (306 * ((pixel >> 16) & 0xFF) +
+ 601 * ((pixel >> 8) & 0xFF) +
+ 117 * (pixel & 0xFF)) >> 10;
}
+ return column;
}
}
projects / zxing.git / blobdiff