/**
* Method for resizing images when images are stored in the database.
*
* <p>Convenience method that returns a scaled instance of the provided image. This method never
* resizes by more than 50% since resizing by more than that amount causes quality issues with the
* BICUBIC and BILINEAR algorithms.
*
* <p>Based on examples from the GraphicsUtilities sample from the book "Filthy Rich Clients" by
* Chet Haase and Romain Guy (http://filthyrichclients.org/). That source is dual licensed: LGPL
* (Sun and Romain Guy) and BSD (Romain Guy).
*
* @param fileId The file identifier for the original image to be scaled.
* @param fileVersionId The ID of the image revision being resized, or -1 if the current image
* revision is being resized.
* @param targetWidth the desired width of the scaled instance in pixels.
* @param targetHeight the desired height of the scaled instance in pixels.
* @return a dimensions of scaled image
*/
public static Dimension resizeImage(
int fileId, int fileVersionId, int targetWidth, int targetHeight) throws IOException {
long start = System.currentTimeMillis();
ImageData imageData = ImageProcessor.loadImage(fileId, fileVersionId);
BufferedImage tmp = ImageIO.read(new ByteArrayInputStream(imageData.data));
if (tmp == null) {
throw new IOException(
"JDK is unable to process image data, possibly indicating data corruption: " + fileId);
}
BufferedImage resized = ImageProcessor.resizeImage(tmp, targetWidth, targetHeight);
int pos = imageData.mimeType.lastIndexOf('/');
if (pos == -1 || (pos + 1) >= imageData.mimeType.length()) {
throw new IOException("Unknown image file type " + imageData.mimeType);
}
String imageType = imageData.mimeType.substring(pos + 1).toLowerCase();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
boolean result = ImageIO.write(resized, imageType, baos);
if (!result) {
throw new IOException(
"No appropriate writer found when writing image: " + imageData.fileVersionId);
}
baos.close();
imageData.width = resized.getWidth();
imageData.height = resized.getHeight();
imageData.data = baos.toByteArray();
saveImage(imageData);
if (logger.isDebugEnabled()) {
long current = System.currentTimeMillis();
String message =
"Image resize time ("
+ ((current - start) / 1000.000)
+ " s), dimensions: "
+ targetWidth
+ "x"
+ targetHeight
+ " for fileId: "
+ fileId;
logger.debug(message);
}
return new Dimension(imageData.width, imageData.height);
}
/**
* Convenience method that returns a scaled instance of the provided image. This method never
* resizes by more than 50% since resizing by more than that amount causes quality issues with the
* BICUBIC and BILINEAR algorithms.
*
* <p>Based on examples from the GraphicsUtilities sample from the book "Filthy Rich Clients" by
* Chet Haase and Romain Guy (http://filthyrichclients.org/). That source is dual licensed: LGPL
* (Sun and Romain Guy) and BSD (Romain Guy).
*
* @param fileId The file identifier for the original image to be scaled.
* @param targetWidth the desired width of the scaled instance in pixels.
* @param targetHeight the desired height of the scaled instance in pixels.
* @return a dimensions of scaled image
*/
public static Dimension resizeImage(int fileId, int targetWidth, int targetHeight)
throws IOException {
long start = System.currentTimeMillis();
ImageData imageData = ImageProcessor.loadImage(fileId);
BufferedImage tmp = ImageIO.read(new ByteArrayInputStream(imageData.data));
if (tmp == null) {
throw new IOException(
"JDK is unable to process image data, possibly indicating data corruption: " + fileId);
}
int type =
(tmp.getTransparency() == Transparency.OPAQUE)
? BufferedImage.TYPE_INT_RGB
: BufferedImage.TYPE_INT_ARGB;
int width = tmp.getWidth();
int height = tmp.getHeight();
BufferedImage resized = tmp;
do {
width /= 2;
if (width < targetWidth) {
width = targetWidth;
}
height /= 2;
if (height < targetHeight) {
height = targetHeight;
}
tmp = new BufferedImage(width, height, type);
Graphics2D g2 = tmp.createGraphics();
g2.setRenderingHint(
RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g2.drawImage(resized, 0, 0, width, height, null);
g2.dispose();
resized = tmp;
} while (width != targetWidth || height != targetHeight);
if (logger.isDebugEnabled()) {
long current = System.currentTimeMillis();
String message =
"Image resize time ("
+ ((current - start) / 1000.000)
+ " s), dimensions: "
+ targetWidth
+ "x"
+ targetHeight
+ " for fileId: "
+ fileId;
logger.debug(message);
}
int pos = imageData.mimeType.lastIndexOf('/');
if (pos == -1 || (pos + 1) >= imageData.mimeType.length()) {
throw new IOException("Unknown image file type " + imageData.mimeType);
}
String imageType = imageData.mimeType.substring(pos + 1).toLowerCase();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
boolean result = ImageIO.write(resized, imageType, baos);
if (!result) {
throw new IOException(
"No appropriate writer found when writing image: " + imageData.fileVersionId);
}
baos.close();
imageData.width = resized.getWidth();
imageData.height = resized.getHeight();
imageData.data = baos.toByteArray();
saveImage(imageData);
return new Dimension(imageData.width, imageData.height);
}