Examples with Transform com.google.appengine.api.images.ImagesServicePb.Transform used on opensource projects

Example 1 with Transform

use of com.google.appengine.api.images.ImagesServicePb.Transform in project appengine-java-standard by GoogleCloudPlatform.

the class LocalBlobImageServlet method transformImage.

/**
 * Transforms the given image specified in the {@code ParseUrl} argument.
 *
 * Applies all the requested resize and crop operations to a valid image.
 *
 * @param request a valid {@code ParseUrl} instance
 *
 * @return the transformed image in an Image class
 * @throws ApiProxy.ApplicationException If the image cannot be opened,
 *    encoded, or if the transform is malformed
 */
protected Image transformImage(final ParsedUrl request) {
    return AccessController.doPrivileged(new PrivilegedAction<Image>() {

        @Override
        public Image run() {
            // Obtain the image bytes as a BufferedImage
            Status unusedStatus = new Status();
            ImageData imageData = ImageData.newBuilder().setBlobKey(request.getBlobKey()).setContent(ByteString.EMPTY).build();
            String originalMimeType = imagesService.getMimeType(imageData);
            BufferedImage img = imagesService.openImage(imageData, unusedStatus);
            // Apply the transform
            if (request.hasOptions()) {
                // Crop
                if (request.getCrop()) {
                    Transform.Builder cropXform = null;
                    float width = img.getWidth();
                    float height = img.getHeight();
                    if (width > height) {
                        cropXform = Transform.newBuilder();
                        float delta = (width - height) / (width * 2.0f);
                        cropXform.setCropLeftX(delta);
                        cropXform.setCropRightX(1.0f - delta);
                    } else if (width < height) {
                        cropXform = Transform.newBuilder();
                        float delta = (height - width) / (height * 2.0f);
                        float topDelta = Math.max(0.0f, delta - 0.25f);
                        float bottomDelta = 1.0f - (2.0f * delta) + topDelta;
                        cropXform.setCropTopY(topDelta);
                        cropXform.setCropBottomY(bottomDelta);
                    }
                    if (cropXform != null) {
                        img = imagesService.processTransform(img, cropXform.build(), unusedStatus);
                    }
                }
                // Resize
                Transform resizeXform = Transform.newBuilder().setWidth(request.getResize()).setHeight(request.getResize()).build();
                img = imagesService.processTransform(img, resizeXform, unusedStatus);
            } else if (img.getWidth() > DEFAULT_SERVING_SIZE || img.getHeight() > DEFAULT_SERVING_SIZE) {
                // Resize down to default serving size.
                Transform resizeXform = Transform.newBuilder().setWidth(DEFAULT_SERVING_SIZE).setHeight(DEFAULT_SERVING_SIZE).build();
                img = imagesService.processTransform(img, resizeXform, unusedStatus);
            }
            MIME_TYPE outputMimeType = MIME_TYPE.JPEG;
            String outputMimeTypeString = "image/jpeg";
            if (transcodeToPng.contains(originalMimeType)) {
                outputMimeType = MIME_TYPE.PNG;
                outputMimeTypeString = "image/png";
            }
            return new Image(imagesService.saveImage(img, outputMimeType, unusedStatus), outputMimeTypeString);
        }
    });
}