Implement lossless cropping interface in Java
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@501 632fc199-4ca6-4c93-a231-07263d6284db
diff --git a/java/TJExample.java b/java/TJExample.java
index 8913c72..4718db0 100644
--- a/java/TJExample.java
+++ b/java/TJExample.java
@@ -64,6 +64,18 @@
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 static void main(String argv[]) {
BufferedImage img = null; byte[] bmpBuf = null;
+ TJTransform xform = new TJTransform();
try {
@@ -133,6 +146,38 @@
}
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 @@
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 @@
else outSubsamp = TJ.SAMP_444;
}
}
+ System.gc();
System.out.print("Dest. Image (" + outFormat + "): " + width + " x "
+ height + " pixels");
@@ -218,7 +275,8 @@
}
catch(Exception e) {
- System.out.println(e);
+ e.printStackTrace();
+ System.exit(-1);
}
}