/**
* Slow filter.
*
* @param src the src.
* @param dst the dst.
* @return the int.
*/
private int slowFilter(Raster src, WritableRaster dst) {
// TODO: make correct interpolation
// TODO: what if there are different data types?
Rectangle srcBounds = src.getBounds();
Rectangle dstBounds = dst.getBounds();
Rectangle normDstBounds = new Rectangle(0, 0, dstBounds.width, dstBounds.height);
Rectangle bounds = getBounds2D(src).getBounds().intersection(normDstBounds);
AffineTransform inv = null;
try {
inv = at.createInverse();
} catch (NoninvertibleTransformException e) {
return -1;
}
double[] m = new double[6];
inv.getMatrix(m);
int minSrcX = srcBounds.x;
int minSrcY = srcBounds.y;
int maxSrcX = srcBounds.x + srcBounds.width;
int maxSrcY = srcBounds.y + srcBounds.height;
int minX = bounds.x + dstBounds.x;
int minY = bounds.y + dstBounds.y;
int maxX = minX + bounds.width;
int maxY = minY + bounds.height;
int hx = (int) (m[0] * 256);
int hy = (int) (m[1] * 256);
int vx = (int) (m[2] * 256);
int vy = (int) (m[3] * 256);
int sx = (int) (m[4] * 256) + hx * bounds.x + vx * bounds.y + (srcBounds.x) * 256;
int sy = (int) (m[5] * 256) + hy * bounds.x + vy * bounds.y + (srcBounds.y) * 256;
vx -= hx * bounds.width;
vy -= hy * bounds.width;
if (src.getTransferType() == dst.getTransferType()) {
for (int y = minY; y < maxY; y++) {
for (int x = minX; x < maxX; x++) {
int px = sx >> 8;
int py = sy >> 8;
if (px >= minSrcX && py >= minSrcY && px < maxSrcX && py < maxSrcY) {
Object val = src.getDataElements(px, py, null);
dst.setDataElements(x, y, val);
}
sx += hx;
sy += hy;
}
sx += vx;
sy += vy;
}
} else {
float pixel[] = null;
for (int y = minY; y < maxY; y++) {
for (int x = minX; x < maxX; x++) {
int px = sx >> 8;
int py = sy >> 8;
if (px >= minSrcX && py >= minSrcY && px < maxSrcX && py < maxSrcY) {
pixel = src.getPixel(px, py, pixel);
dst.setPixel(x, y, pixel);
}
sx += hx;
sy += hy;
}
sx += vx;
sy += vy;
}
}
return 0;
}
/**
* Loads PNG files and returns the result as an int[][]. The only PNG formats permitted are those
* with up to 256 grays (including simple black and white) or indexed colors from an up to
* 256-sized color table. Each integer value represents the gray level or the color table index
* value of the pixel. The Y dimension is not flipped.
*/
public static int[][] loadPNGFile(InputStream str) throws IOException {
// read the bytes into a byte array
BufferedInputStream stream = new BufferedInputStream(str);
ArrayList list = new ArrayList();
int count = 0;
while (true) {
byte[] buffer = new byte[16384 * 16];
int len = stream.read(buffer);
if (len <= 0) // all done
break;
else if (len < buffer.length) {
byte[] buf2 = new byte[len];
System.arraycopy(buffer, 0, buf2, 0, len);
buffer = buf2;
}
count += len;
list.add(buffer);
}
byte[] data = new byte[count];
int cur = 0;
for (int i = 0; i < list.size(); i++) {
byte[] b = (byte[]) (list.get(i));
System.arraycopy(b, 0, data, cur, b.length);
cur += b.length;
}
// Next convert the byte array to a buffered image
BufferedImage image = ((ToolkitImage) (new ImageIcon(data).getImage())).getBufferedImage();
// Is the color model something we can use?
int type = image.getType();
if (type == BufferedImage.TYPE_BYTE_BINARY || type == BufferedImage.TYPE_BYTE_GRAY) {
int w = image.getWidth();
int h = image.getHeight();
int[][] result = new int[w][h];
// obviously this could be done more efficiently
for (int i = 0; i < w; i++)
for (int j = 0; j < h; j++) result[i][j] = (image.getRGB(i, j) & 0xFF);
return result;
} else if (type == BufferedImage.TYPE_BYTE_INDEXED) {
Raster raster = image.getRaster();
if (raster.getTransferType() != DataBuffer.TYPE_BYTE) // uh oh
throw new IOException("Input Stream must contain an image with byte data if indexed.");
byte[] pixel = new byte[1];
int w = image.getWidth();
int h = image.getHeight();
int[][] result = new int[w][h];
// obviously this could be done more efficiently
for (int i = 0; i < w; i++)
for (int j = 0; j < h; j++) {
result[i][j] = ((byte[]) (raster.getDataElements(i, j, pixel)))[0];
if (result[i][j] < 0) result[i][j] += 256;
}
return result;
}
// else if (type == TYPE_USHORT_GRAY) // at present we don't handle shorts
// {
// }
else
throw new IOException(
"Input Stream must contain a binary, byte-sized grayscale, or byte-sized indexed color scheme: "
+ image);
}