@Override
protected void writeLayer(
SlingHttpServletRequest req, SlingHttpServletResponse resp, ImageContext c, Layer layer)
throws IOException, RepositoryException {
Image image = new Image(c.resource);
if (!image.hasContent()) {
resp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// get style and set constraints
image.loadStyleData(c.style);
// get pure layer
layer = image.getLayer(false, false, false);
boolean modified = false;
if (layer != null) {
// crop
modified = image.crop(layer) != null;
// rotate
modified |= image.rotate(layer) != null;
// resize
modified |= image.resize(layer) != null;
// apply diff if needed (because we create the layer inline)
modified |= applyDiff(layer, c);
}
// don't cache images on authoring instances
// Cache-Control: no-cache allows caching (e.g. in the browser cache) but
// will force revalidation using If-Modified-Since or If-None-Match every time,
// avoiding aggressive browser caching
if (!WCMMode.DISABLED.equals(WCMMode.fromRequest(req))) {
resp.setHeader("Cache-Control", "no-cache");
}
if (modified) {
String mimeType = image.getMimeType();
if (ImageHelper.getExtensionFromType(mimeType) == null) {
// get default mime type
mimeType = "image/png";
}
resp.setContentType(mimeType);
layer.write(mimeType, mimeType.equals("image/gif") ? 255 : 1.0, resp.getOutputStream());
} else {
// do not re-encode layer, just spool
Property data = image.getData();
InputStream in = data.getStream();
resp.setContentLength((int) data.getLength());
resp.setContentType(image.getMimeType());
IOUtils.copy(in, resp.getOutputStream());
in.close();
}
resp.flushBuffer();
}
public BufferedImage getImage(final Rendition rendition) throws IOException {
ExtractedMetadata metadata = extractMetadata(rendition.getAsset());
String text = (String) metadata.getMetaDataProperty("Content");
if (text != null && text.length() > 0) {
// create text layer
final Layer layer = new Layer(500, 600, Color.WHITE);
layer.setPaint(Color.black);
Font font = new Font("Arial", 12);
String displayText = getDisplayText(text, 600, 12);
layer.drawText(10, 10, 500, 600, displayText, font, Font.ALIGN_LEFT, 0, 0);
layer.crop(new Rectangle(510, 600));
return layer.getImage();
} else {
return null;
}
}
