From 41cad759d23fea83178b568c2b482db9afcee024 Mon Sep 17 00:00:00 2001
From: tpylak <tpylak>
Date: Tue, 11 Jan 2011 15:59:51 +0000
Subject: [PATCH] LMS-1965 support black color as transparent in
non-transparent overlay images, recognize image transparency automatically
SVN: 19367
---
.../dss/generic/shared/utils/ImageUtil.java | 24 ++--
.../dss/etl/Hdf5ThumbnailGenerator.java | 2 +-
.../server/images/ImageChannelsUtils.java | 123 +++++++++++++++---
3 files changed, 118 insertions(+), 31 deletions(-)
diff --git a/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/utils/ImageUtil.java b/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/utils/ImageUtil.java
index 26209b5feff..52521107b74 100644
--- a/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/utils/ImageUtil.java
+++ b/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/utils/ImageUtil.java
@@ -160,14 +160,19 @@ public class ImageUtil
*/
public static boolean isImageFile(File file)
{
- String name = file.getName();
+ String fileName = file.getName();
+ String fileType = tryGetFileExtension(fileName);
+ return fileType != null && FILE_TYPES.contains(fileType);
+ }
+
+ private static String tryGetFileExtension(String name)
+ {
int lastIndexOfDot = name.lastIndexOf('.');
if (lastIndexOfDot < 0)
{
- return false;
+ return null;
}
- String fileType = name.substring(lastIndexOfDot + 1).toLowerCase();
- return FILE_TYPES.contains(fileType);
+ return name.substring(lastIndexOfDot + 1).toLowerCase();
}
/**
@@ -267,7 +272,7 @@ public class ImageUtil
*/
public static BufferedImage createThumbnail(BufferedImage image, int maxWidth, int maxHeight)
{
- return rescale(image, maxWidth, maxHeight, true, false);
+ return rescale(image, maxWidth, maxHeight, true);
}
/**
@@ -279,11 +284,9 @@ public class ImageUtil
* @param maxHeight Maximum height of the result image.
* @param enlargeIfNecessary if false and the image has smaller width and height than the
* specified limit, then the image is not changed.
- * @param preserveAlpha if true alpha channel will be not ignored (and image will take more
- * space)
*/
public static BufferedImage rescale(BufferedImage image, int maxWidth, int maxHeight,
- boolean enlargeIfNecessary, boolean preserveAlpha)
+ boolean enlargeIfNecessary)
{
int width = image.getWidth();
int height = image.getHeight();
@@ -304,7 +307,10 @@ public class ImageUtil
int thumbnailWidth = (int) (scale * width + 0.5);
int thumbnailHeight = (int) (scale * height + 0.5);
- int imageType = preserveAlpha ? BufferedImage.TYPE_INT_ARGB : BufferedImage.TYPE_INT_RGB;
+ // preserve alpha channel if it was present before
+ int imageType =
+ image.getColorModel().hasAlpha() ? BufferedImage.TYPE_INT_ARGB
+ : BufferedImage.TYPE_INT_RGB;
BufferedImage thumbnail = new BufferedImage(thumbnailWidth, thumbnailHeight, imageType);
Graphics2D graphics2D = thumbnail.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
diff --git a/screening/source/java/ch/systemsx/cisd/openbis/dss/etl/Hdf5ThumbnailGenerator.java b/screening/source/java/ch/systemsx/cisd/openbis/dss/etl/Hdf5ThumbnailGenerator.java
index 1997be2239d..1fd91d69d57 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/dss/etl/Hdf5ThumbnailGenerator.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/dss/etl/Hdf5ThumbnailGenerator.java
@@ -72,7 +72,7 @@ class Hdf5ThumbnailGenerator implements IHdf5WriterClient
File img = new File(imagesInStoreFolder, imagePath);
BufferedImage image = ImageUtil.loadImage(img);
BufferedImage thumbnail =
- ImageUtil.rescale(image, thumbnailMaxWidth, thumbnailMaxHeight, false, true);
+ ImageUtil.rescale(image, thumbnailMaxWidth, thumbnailMaxHeight, false);
ByteArrayOutputStream output = new ByteArrayOutputStream();
try
{
diff --git a/screening/source/java/ch/systemsx/cisd/openbis/dss/generic/server/images/ImageChannelsUtils.java b/screening/source/java/ch/systemsx/cisd/openbis/dss/generic/server/images/ImageChannelsUtils.java
index b16f7d65062..4e4ab5dc897 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/dss/generic/server/images/ImageChannelsUtils.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/dss/generic/server/images/ImageChannelsUtils.java
@@ -115,24 +115,24 @@ public class ImageChannelsUtils
{
// NOTE: never merges the overlays, draws each channel separately (merging looses
// transparency and is slower)
- List<BufferedImage> overlayImages =
+ List<ImageWithReference> overlayImages =
getSingleImagesSkipNonExisting(overlayChannels, overlaySize,
datasetDirectoryProvider);
- for (BufferedImage overlayImage : overlayImages)
+ for (ImageWithReference overlayImage : overlayImages)
{
if (image != null)
{
drawOverlay(image, overlayImage);
} else
{
- image = overlayImage;
+ image = overlayImage.getBufferedImage();
}
}
}
return createResponseContentStream(image, null);
}
- private static List<BufferedImage> getSingleImagesSkipNonExisting(
+ private static List<ImageWithReference> getSingleImagesSkipNonExisting(
DatasetAcquiredImagesReference imagesReference, RequestedImageSize imageSize,
IDatasetDirectoryProvider datasetDirectoryProvider)
{
@@ -445,7 +445,7 @@ public class ImageChannelsUtils
start = operationLog.isDebugEnabled() ? System.currentTimeMillis() : 0;
image =
ImageUtil.rescale(image, size.getWidth(), size.getHeight(),
- requestedSize.enlargeIfNecessary(), true);
+ requestedSize.enlargeIfNecessary());
if (operationLog.isDebugEnabled())
{
operationLog.debug("Create thumbnail: " + (System.currentTimeMillis() - start));
@@ -492,8 +492,8 @@ public class ImageChannelsUtils
return calculateAndTransformSingleImage(imageReference, transform, allChannelsMerged);
} else
{
- List<BufferedImage> images = calculateSingleImages(imageReferences);
- BufferedImage mergedImage = mergeImages(images, imageReferences);
+ List<ImageWithReference> images = calculateSingleImages(imageReferences);
+ BufferedImage mergedImage = mergeImages(images);
// NOTE: even if we are not merging all the channels but just few of them we use the
// merged-channel transformation
IImageTransformerFactory transformerFactory =
@@ -513,13 +513,37 @@ public class ImageChannelsUtils
return factoryOrNull.createTransformer().transform(input);
}
- private static List<BufferedImage> calculateSingleImages(
+ private static class ImageWithReference
+ {
+ private final BufferedImage image;
+
+ private final AbsoluteImageReference reference;
+
+ public ImageWithReference(BufferedImage image, AbsoluteImageReference reference)
+ {
+ this.image = image;
+ this.reference = reference;
+ }
+
+ public BufferedImage getBufferedImage()
+ {
+ return image;
+ }
+
+ public AbsoluteImageReference getReference()
+ {
+ return reference;
+ }
+ }
+
+ private static List<ImageWithReference> calculateSingleImages(
List<AbsoluteImageReference> imageReferences)
{
- List<BufferedImage> images = new ArrayList<BufferedImage>();
+ List<ImageWithReference> images = new ArrayList<ImageWithReference>();
for (AbsoluteImageReference imageRef : imageReferences)
{
- images.add(calculateSingleImage(imageRef));
+ BufferedImage image = calculateSingleImage(imageRef);
+ images.add(new ImageWithReference(image, imageRef));
}
return images;
}
@@ -559,13 +583,11 @@ public class ImageChannelsUtils
return (i1OrNull == null) ? (i2OrNull == null) : i1OrNull.equals(i2OrNull);
}
- private static BufferedImage mergeImages(List<BufferedImage> images,
- List<AbsoluteImageReference> imageReferences)
+ private static BufferedImage mergeImages(List<ImageWithReference> images)
{
assert images.size() > 1 : "more than 1 image expected, but found: " + images.size();
- assert images.size() == imageReferences.size() : "images.size() != imageReferences.size()";
- BufferedImage newImage = createNewImage(images.get(0));
+ BufferedImage newImage = createNewImage(images.get(0).getBufferedImage());
int width = newImage.getWidth();
int height = newImage.getHeight();
int colorBuffer[] = new int[4];
@@ -573,30 +595,89 @@ public class ImageChannelsUtils
{
for (int y = 0; y < height; y++)
{
- int mergedRGB = mergeRGBColor(images, imageReferences, x, y, colorBuffer);
+ int mergedRGB = mergeRGBColor(images, x, y, colorBuffer);
newImage.setRGB(x, y, mergedRGB);
}
}
return newImage;
}
- private static void drawOverlay(BufferedImage image, BufferedImage overlayImage)
+ private static void drawOverlay(BufferedImage image, ImageWithReference overlayImage)
+ {
+ BufferedImage overlayBufferedImage = overlayImage.getBufferedImage();
+ if (supportsTransparency(overlayImage))
+ {
+ drawTransparentOverlayFast(image, overlayBufferedImage);
+ } else
+ {
+ drawOverlaySlow(image, overlayBufferedImage);
+ }
+ }
+
+ private static void drawTransparentOverlayFast(BufferedImage image,
+ BufferedImage overlayBufferedImage)
{
Graphics2D graphics = image.createGraphics();
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER);
graphics.setComposite(ac);
- graphics.drawImage(overlayImage, null, null);
+ graphics.drawImage(overlayBufferedImage, null, null);
+ }
+
+ /**
+ * Draws overlay by computing the maximal color components (r,g,b) for each pixel. In this way
+ * both transparent and black pixels are not drawn. Useful when overlays are saved in a format
+ * which does not support transparency.
+ */
+ private static void drawOverlaySlow(BufferedImage image, BufferedImage overlayImage)
+ {
+ int width = Math.min(image.getWidth(), overlayImage.getWidth());
+ int height = Math.min(image.getHeight(), overlayImage.getHeight());
+
+ for (int x = 0; x < width; x++)
+ {
+ for (int y = 0; y < height; y++)
+ {
+ int imageRGB = image.getRGB(x, y);
+ int overlayRGB = overlayImage.getRGB(x, y);
+ int overlayedRGB = overlayRGBColor(imageRGB, overlayRGB);
+ image.setRGB(x, y, overlayedRGB);
+ }
+ }
+ }
+
+ // creates a color with a maximum value of each component
+ private static int overlayRGBColor(int imageRGB, int overlayRGB)
+ {
+ Color imageColor = new Color(imageRGB);
+ Color overlayColor = new Color(overlayRGB, true);
+
+ if (overlayColor.getAlpha() == 0)
+ {
+ return imageRGB; // overlay is transparent, return the original pixel
+ } else
+ {
+ int r = Math.max(imageColor.getRed(), overlayColor.getRed());
+ int g = Math.max(imageColor.getGreen(), overlayColor.getGreen());
+ int b = Math.max(imageColor.getBlue(), overlayColor.getBlue());
+ return new Color(r, g, b).getRGB();
+ }
+ }
+
+ private static boolean supportsTransparency(ImageWithReference image)
+ {
+ return image.getBufferedImage().getColorModel().hasAlpha();
}
- private static int mergeRGBColor(List<BufferedImage> images,
- List<AbsoluteImageReference> imageReferences, int x, int y, int colorBuffer[])
+ private static int mergeRGBColor(List<ImageWithReference> images, int x, int y,
+ int colorBuffer[])
{
Arrays.fill(colorBuffer, 0);
for (int index = 0; index < images.size(); index++)
{
- int rgb = images.get(index).getRGB(x, y);
+ ImageWithReference image = images.get(index);
+ int rgb = image.getBufferedImage().getRGB(x, y);
Color singleColor = new Color(rgb, true);
- int channelIndex = imageReferences.get(index).getChannelIndex();
+ int channelIndex = image.getReference().getChannelIndex();
for (int i : getRGBColorIndexes(channelIndex))
{
colorBuffer[i] = Math.max(colorBuffer[i], extractMaxColorIngredient(singleColor));
--
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