Author: ruschein
Date: 2010-02-01 14:17:27 -0800 (Mon, 01 Feb 2010)
New Revision: 19098
Modified:
corelibs/trunk/ding/src/ding/view/DGraphView.java
Log:
Instrumented to print out image compression ratios.
Modified: corelibs/trunk/ding/src/ding/view/DGraphView.java
===================================================================
--- corelibs/trunk/ding/src/ding/view/DGraphView.java 2010-02-01 21:41:06 UTC
(rev 19097)
+++ corelibs/trunk/ding/src/ding/view/DGraphView.java 2010-02-01 22:17:27 UTC
(rev 19098)
@@ -98,7 +98,11 @@
boolean calledFromGetSnapshot = false;
// Size of snapshot image
- private static final int DEF_SNAPSHOT_SIZE = 4000;
+ private static final int DEF_SNAPSHOT_SIZE = 400;
+ private static double minComprFactorSoFar = Double.MAX_VALUE;
+ private static double maxComprFactorSoFar = Double.MIN_VALUE;
+ private static double compressionFactors[] = new double[10000];
+ private static int compressionFactorCount = 0;
static final float DEFAULT_ANCHOR_SIZE = 9.0f;
static final Paint DEFAULT_ANCHOR_SELECTED_PAINT = Color.red;
@@ -2612,7 +2616,7 @@
bufferedImage =
(BufferedImage)createImage(DEF_SNAPSHOT_SIZE,
DEF_SNAPSHOT_SIZE, 1,
/* skipBackground =
*/ true);
- snapshotImage = convertToPNG(bufferedImage);
+ snapshotImage = convertToCompressedImage(bufferedImage);
latest = true;
}
@@ -2628,14 +2632,32 @@
/**
* Converts a BufferedImage to a lossless PNG.
*/
- private byte[] convertToPNG(final BufferedImage bufferedImage) {
+ private byte[] convertToCompressedImage(final BufferedImage
bufferedImage) {
+ System.err.println("Entering convertToCompressedImage()");
try {
- final ByteArrayOutputStream baos = new
ByteArrayOutputStream();
- ImageIO.write(bufferedImage, "PNG", baos);
+ final ByteArrayOutputStream baos = new
ByteArrayOutputStream(100000);
+ ImageIO.write(bufferedImage, "jpeg", baos);
+ final byte[] retval = baos.toByteArray();
+ final double compressionFactor = (DEF_SNAPSHOT_SIZE *
DEF_SNAPSHOT_SIZE * 4.0) / retval.length;
+ if (compressionFactor < minComprFactorSoFar)
+ minComprFactorSoFar = compressionFactor;
+ if (compressionFactor > maxComprFactorSoFar)
+ maxComprFactorSoFar = compressionFactor;
+ System.err.println("About to exit
convertToCompressedImage(), compr. factor = " + compressionFactor);
+ System.err.println("Min. compr. factor so far = " +
minComprFactorSoFar);
+ System.err.println("Max. compr. factor so far = " +
maxComprFactorSoFar);
- return baos.toByteArray();
+ compressionFactors[compressionFactorCount++] =
compressionFactor;
+ // Calc avg.
+ double sum = 0.0;
+ for (int i = 0; i < compressionFactorCount; ++i)
+ sum += compressionFactors[i];
+ final double comprFactorAvg = sum /
compressionFactorCount;
+ System.err.println("Avg. compr. factor so far = " +
comprFactorAvg);
+ return retval;
} catch (final IOException e) {
- System.err.println("Failed to convert a BufferedImage
to a PNG!");
+ System.err.println("Failed to convert a BufferedImage
to a PNG! (" + e + ")");
+ System.exit(-1);
return null;
}
}
@@ -2644,12 +2666,16 @@
/**
* Converts a PNG to a BufferedImage.
*/
- private BufferedImage convertToBufferedImage(final byte[] png) {
+ private BufferedImage convertToBufferedImage(final byte[]
compressedImage) {
+ System.err.println("Entering convertToBufferedImage()");
try {
- final ByteArrayInputStream is = new
ByteArrayInputStream(png);
- return (BufferedImage)ImageIO.read(is);
+ final ByteArrayInputStream is = new
ByteArrayInputStream(compressedImage);
+ final BufferedImage retval =
(BufferedImage)ImageIO.read(is);
+ System.err.println("About to exit
convertToBufferedImage()");
+ return retval;
} catch (final IOException e) {
- System.err.println("Failed to convert a PNG to a
BufferedImage!");
+ System.err.println("Failed to convert a PNG to a
BufferedImage! (" + e + ")");
+ System.exit(-1);
return null;
}
}
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