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Implement lossless cropping interface in Java

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@501 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2011-03-04 10:13:59 +00:00
parent 46531c3265
commit e85730157e
6 changed files with 337 additions and 10 deletions
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62
java/TJExample.java
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@@ -64,6 +64,18 @@ public class TJExample {
System.out.println(" file, or 4:4:4 otherwise.\n");
System.out.println("-q <1-100> = If the output image is a JPEG file, this specifies the JPEG");
System.out.println(" quality to use when recompressing it (default = 95).\n");
System.out.println("-hflip, -vflip, -transpose, -transverse, -rot90, -rot180, -rot270 =");
System.out.println(" If the input image is a JPEG file, perform the corresponding lossless");
System.out.println(" transform prior to decompression (these options are mutually exclusive)\n");
System.out.println("-grayscale = If the input image is a JPEG file, perform lossless grayscale");
System.out.println(" conversion prior to decompression (can be combined with the other");
System.out.println(" transforms above)\n");
System.out.println("-crop X,Y,WxH = If the input image is a JPEG file, perform lossless cropping");
System.out.println(" prior to decompression. X,Y specifies the upper left corner of the");
System.out.println(" cropping region, and WxH specifies its width and height. X,Y must be");
System.out.println(" evenly divible by the MCU block size (8x8 if the source image was");
System.out.println(" compressed using no subsampling or grayscale, or 16x8 for 4:2:2 or 16x16");
System.out.println(" for 4:2:0.)\n");
System.exit(1);
}
@@ -74,6 +86,7 @@ public class TJExample {
public static void main(String argv[]) {
BufferedImage img = null; byte[] bmpBuf = null;
TJTransform xform = new TJTransform();
try {
@@ -133,6 +146,38 @@ public class TJExample {
}
else usage();
}
if(argv[i].substring(0, 2).equalsIgnoreCase("-g"))
xform.options |= TJ.XFORM_GRAY;
if(argv[i].equalsIgnoreCase("-hflip"))
xform.op = TJ.XFORM_HFLIP;
if(argv[i].equalsIgnoreCase("-vflip"))
xform.op = TJ.XFORM_VFLIP;
if(argv[i].equalsIgnoreCase("-transpose"))
xform.op = TJ.XFORM_TRANSPOSE;
if(argv[i].equalsIgnoreCase("-transverse"))
xform.op = TJ.XFORM_TRANSVERSE;
if(argv[i].equalsIgnoreCase("-rot90"))
xform.op = TJ.XFORM_ROT90;
if(argv[i].equalsIgnoreCase("-rot180"))
xform.op = TJ.XFORM_ROT180;
if(argv[i].equalsIgnoreCase("-rot270"))
xform.op = TJ.XFORM_ROT270;
if(argv[i].length() > 2
&& argv[i].substring(0, 2).equalsIgnoreCase("-c")) {
if(i >= argv.length - 1) usage();
String[] cropArg = argv[++i].split(",");
if(cropArg.length != 3) usage();
String[] dimArg = cropArg[2].split("[xX]");
if(dimArg.length != 2) usage();
int tempx = Integer.parseInt(cropArg[0]);
int tempy = Integer.parseInt(cropArg[1]);
int tempw = Integer.parseInt(dimArg[0]);
int temph = Integer.parseInt(dimArg[1]);
if(tempx < 0 || tempy < 0 || tempw < 1 || temph < 1) usage();
xform.x = tempx; xform.y = tempy;
xform.width = tempw; xform.height = temph;
xform.options |= TJ.XFORM_CROP;
}
}
}
String[] inFileTokens = argv[0].split("\\.");
@@ -156,7 +201,18 @@ public class TJExample {
fis.read(inputBuf);
fis.close();
TJDecompressor tjd = new TJDecompressor(inputBuf);
TJDecompressor tjd;
TJ.ScalingFactor sf;
if(xform.op != TJ.XFORM_NONE || xform.options != 0) {
TJTransformer tjt = new TJTransformer(inputBuf);
TJTransform t[] = new TJTransform[1];
t[0] = xform;
t[0].options |= TJ.XFORM_TRIM;
TJDecompressor[] tjdx = tjt.transform(t, 0);
tjd = tjdx[0];
}
else tjd = new TJDecompressor(inputBuf);
width = tjd.getWidth();
height = tjd.getHeight();
int inSubsamp = tjd.getSubsamp();
@@ -184,6 +240,7 @@ public class TJExample {
else outSubsamp = TJ.SAMP_444;
}
}
System.gc();
System.out.print("Dest. Image (" + outFormat + "): " + width + " x "
+ height + " pixels");
@@ -218,7 +275,8 @@ public class TJExample {
}
catch(Exception e) {
System.out.println(e);
e.printStackTrace();
System.exit(-1);
}
}