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package org.sunflow.image.readers;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import org.sunflow.image.Bitmap;
import org.sunflow.image.BitmapReader;
import org.sunflow.image.formats.BitmapRGBE;
public class HDRBitmapReader implements BitmapReader {
public Bitmap load(String filename, boolean isLinear) throws IOException, BitmapFormatException {
// EP : Try to read filename as an URL or as a file
InputStream f;
try {
// Let's try first to read filename as an URL
URLConnection connection = new URL(filename).openConnection();
if (connection instanceof JarURLConnection) {
JarURLConnection urlConnection = (JarURLConnection) connection;
URL jarFileUrl = urlConnection.getJarFileURL();
if (jarFileUrl.getProtocol().equalsIgnoreCase("file")) {
try {
if (new File(jarFileUrl.toURI()).canWrite()) {
// Refuse to use cache to be able to delete the writable files accessed with jar protocol,
// as suggested in http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6962459
connection.setUseCaches(false);
}
} catch (URISyntaxException ex) {
throw new IOException(ex);
}
}
}
f = connection.getInputStream();
} catch (MalformedURLException ex) {
// Let's try to read filename as a file
f = new FileInputStream(filename);
}
f = new BufferedInputStream(f);
// End of modification
// parse header
boolean parseWidth = false, parseHeight = false;
int width = 0, height = 0;
int last = 0;
while (width == 0 || height == 0 || last != '\n') {
int n = f.read();
switch (n) {
case 'Y':
parseHeight = last == '-';
parseWidth = false;
break;
case 'X':
parseHeight = false;
parseWidth = last == '+';
break;
case ' ':
parseWidth &= width == 0;
parseHeight &= height == 0;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (parseHeight)
height = 10 * height + (n - '0');
else if (parseWidth)
width = 10 * width + (n - '0');
break;
default:
parseWidth = parseHeight = false;
break;
}
last = n;
}
// allocate image
int[] pixels = new int[width * height];
if ((width < 8) || (width > 0x7fff)) {
// run length encoding is not allowed so read flat
readFlatRGBE(f, 0, width * height, pixels);
} else {
int rasterPos = 0;
int numScanlines = height;
int[] scanlineBuffer = new int[4 * width];
while (numScanlines > 0) {
int r = f.read();
int g = f.read();
int b = f.read();
int e = f.read();
if ((r != 2) || (g != 2) || ((b & 0x80) != 0)) {
// this file is not run length encoded
pixels[rasterPos] = (r << 24) | (g << 16) | (b << 8) | e;
readFlatRGBE(f, rasterPos + 1, width * numScanlines - 1, pixels);
break;
}
if (((b << 8) | e) != width)
throw new BitmapFormatException("Invalid scanline width");
int p = 0;
// read each of the four channels for the scanline into
// the buffer
for (int i = 0; i < 4; i++) {
if (p % width != 0)
throw new BitmapFormatException("Unaligned access to scanline data");
int end = (i + 1) * width;
while (p < end) {
int b0 = f.read();
int b1 = f.read();
if (b0 > 128) {
// a run of the same value
int count = b0 - 128;
if ((count == 0) || (count > (end - p)))
throw new BitmapFormatException("Bad scanline data - invalid RLE run");
while (count-- > 0) {
scanlineBuffer[p] = b1;
p++;
}
} else {
// a non-run
int count = b0;
if ((count == 0) || (count > (end - p)))
throw new BitmapFormatException("Bad scanline data - invalid count");
scanlineBuffer[p] = b1;
p++;
if (--count > 0) {
for (int x = 0; x < count; x++)
scanlineBuffer[p + x] = f.read();
p += count;
}
}
}
}
// now convert data from buffer into floats
for (int i = 0; i < width; i++) {
r = scanlineBuffer[i];
g = scanlineBuffer[i + width];
b = scanlineBuffer[i + 2 * width];
e = scanlineBuffer[i + 3 * width];
pixels[rasterPos] = (r << 24) | (g << 16) | (b << 8) | e;
rasterPos++;
}
numScanlines--;
}
}
f.close();
// flip image
for (int y = 0, i = 0, ir = (height - 1) * width; y < height / 2; y++, ir -= width) {
for (int x = 0, i2 = ir; x < width; x++, i++, i2++) {
int t = pixels[i];
pixels[i] = pixels[i2];
pixels[i2] = t;
}
}
return new BitmapRGBE(width, height, pixels);
}
private void readFlatRGBE(InputStream f, int rasterPos, int numPixels, int[] pixels) throws IOException {
while (numPixels-- > 0) {
int r = f.read();
int g = f.read();
int b = f.read();
int e = f.read();
pixels[rasterPos] = (r << 24) | (g << 16) | (b << 8) | e;
rasterPos++;
}
}
}
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