/**
* Writes the data for this segment to the stream in valid JPEG format. The length written takes
* the thumbnail width and height into account. If necessary, the thumbnail is clipped to 255 x
* 255 and a warning is sent to the writer argument. Progress updates are sent to the writer
* argument.
*/
void write(ImageOutputStream ios, BufferedImage thumb, JPEGImageWriter writer)
throws IOException {
int thumbWidth = 0;
int thumbHeight = 0;
int thumbLength = 0;
int[] thumbData = null;
if (thumb != null) {
// Clip if necessary and get the data in thumbData
thumbWidth = thumb.getWidth();
thumbHeight = thumb.getHeight();
if ((thumbWidth > MAX_THUMB_WIDTH) || (thumbHeight > MAX_THUMB_HEIGHT)) {
writer.warningOccurred(JPEGImageWriter.WARNING_THUMB_CLIPPED);
}
thumbWidth = Math.min(thumbWidth, MAX_THUMB_WIDTH);
thumbHeight = Math.min(thumbHeight, MAX_THUMB_HEIGHT);
thumbData = thumb.getRaster().getPixels(0, 0, thumbWidth, thumbHeight, (int[]) null);
thumbLength = thumbData.length;
}
length = DATA_SIZE + LENGTH_SIZE + thumbLength;
writeTag(ios);
byte[] id = {0x4A, 0x46, 0x49, 0x46, 0x00};
ios.write(id);
ios.write(majorVersion);
ios.write(minorVersion);
ios.write(resUnits);
write2bytes(ios, Xdensity);
write2bytes(ios, Ydensity);
ios.write(thumbWidth);
ios.write(thumbHeight);
if (thumbData != null) {
writer.thumbnailStarted(0);
writeThumbnailData(ios, thumbData, writer);
writer.thumbnailComplete();
}
}
/** Writes out a new JFXX extension segment, without saving it. */
private void writeJFXXSegment(
int index, BufferedImage thumbnail, ImageOutputStream ios, JPEGImageWriter writer)
throws IOException {
JFIFExtensionMarkerSegment jfxx = null;
try {
jfxx = new JFIFExtensionMarkerSegment(thumbnail);
} catch (IllegalThumbException e) {
writer.warningOccurred(JPEGImageWriter.WARNING_ILLEGAL_THUMBNAIL);
return;
}
writer.thumbnailStarted(index);
jfxx.write(ios, writer);
writer.thumbnailComplete();
}
private void writeThumb(
ImageOutputStream ios,
BufferedImage thumb,
JFIFExtensionMarkerSegment jfxx,
int index,
boolean onlyOne,
JPEGImageWriter writer)
throws IOException {
ColorModel cm = thumb.getColorModel();
ColorSpace cs = cm.getColorSpace();
if (cm instanceof IndexColorModel) {
// We never write a palette image into the header
// So if it's the only one, we need to write the header first
if (onlyOne) {
write(ios, writer);
}
if ((jfxx == null) || (jfxx.code == THUMB_PALETTE)) {
writeJFXXSegment(index, thumb, ios, writer); // default
} else {
// Expand to RGB
BufferedImage thumbRGB =
((IndexColorModel) cm).convertToIntDiscrete(thumb.getRaster(), false);
jfxx.setThumbnail(thumbRGB);
writer.thumbnailStarted(index);
jfxx.write(ios, writer); // Handles clipping if needed
writer.thumbnailComplete();
}
} else if (cs.getType() == ColorSpace.TYPE_RGB) {
if (jfxx == null) {
if (onlyOne) {
write(ios, thumb, writer); // As part of the header
} else {
writeJFXXSegment(index, thumb, ios, writer); // default
}
} else {
// If this is the only one, write the header first
if (onlyOne) {
write(ios, writer);
}
if (jfxx.code == THUMB_PALETTE) {
writeJFXXSegment(index, thumb, ios, writer); // default
writer.warningOccurred(JPEGImageWriter.WARNING_NO_RGB_THUMB_AS_INDEXED);
} else {
jfxx.setThumbnail(thumb);
writer.thumbnailStarted(index);
jfxx.write(ios, writer); // Handles clipping if needed
writer.thumbnailComplete();
}
}
} else if (cs.getType() == ColorSpace.TYPE_GRAY) {
if (jfxx == null) {
if (onlyOne) {
BufferedImage thumbRGB = expandGrayThumb(thumb);
write(ios, thumbRGB, writer); // As part of the header
} else {
writeJFXXSegment(index, thumb, ios, writer); // default
}
} else {
// If this is the only one, write the header first
if (onlyOne) {
write(ios, writer);
}
if (jfxx.code == THUMB_RGB) {
BufferedImage thumbRGB = expandGrayThumb(thumb);
writeJFXXSegment(index, thumbRGB, ios, writer);
} else if (jfxx.code == THUMB_JPEG) {
jfxx.setThumbnail(thumb);
writer.thumbnailStarted(index);
jfxx.write(ios, writer); // Handles clipping if needed
writer.thumbnailComplete();
} else if (jfxx.code == THUMB_PALETTE) {
writeJFXXSegment(index, thumb, ios, writer); // default
writer.warningOccurred(JPEGImageWriter.WARNING_NO_GRAY_THUMB_AS_INDEXED);
}
}
} else {
writer.warningOccurred(JPEGImageWriter.WARNING_ILLEGAL_THUMBNAIL);
}
}
