Expose TurboJPEG scaling features in Java wrapper
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@375 632fc199-4ca6-4c93-a231-07263d6284db
diff --git a/java/TJExample.java b/java/TJExample.java
index f6c2e43..6595f63 100644
--- a/java/TJExample.java
+++ b/java/TJExample.java
@@ -38,13 +38,33 @@
public static final String classname=new TJExample().getClass().getName();
+ private static void usage() {
+ System.out.println("\nUSAGE: java "+classname+" <Input file> <Output file> [options]\n");
+ System.out.println("Options:\n");
+ System.out.println("-scale 1/N = scale the width/height of the output image by a factor of 1/N");
+ System.out.println(" (N = 1, 2, 4, or 8}\n");
+ System.exit(1);
+ }
+
public static void main(String argv[]) {
try {
if(argv.length<2) {
- System.out.println("USAGE: java "+classname+" <Input file> <Output file>");
- System.exit(1);
+ usage();
+ }
+
+ int scalefactor=1;
+ if(argv.length>2) {
+ for(int i=2; i<argv.length; i++) {
+ if(argv[i].equalsIgnoreCase("-scale") && i<argv.length-1) {
+ String [] scalearg=argv[++i].split("/");
+ if(scalearg.length!=2 || Integer.parseInt(scalearg[0])!=1
+ || (scalefactor=Integer.parseInt(scalearg[1]))<1
+ || scalefactor>8 || (scalefactor&(scalefactor-1))!=0)
+ usage();
+ }
+ }
}
File file=new File(argv[0]);
@@ -68,9 +88,18 @@
case TJ.GRAYSCALE: System.out.println("Grayscale"); break;
default: System.out.println("Unknown subsampling"); break;
}
+
+ if(scalefactor!=1) {
+ tji.width=(tji.width+scalefactor-1)/scalefactor;
+ tji.height=(tji.height+scalefactor-1)/scalefactor;
+ System.out.println("Dest. Image: "+tji.width+" x "+tji.height
+ +" pixels");
+ }
+
+
byte [] tmpbuf=new byte[tji.width*tji.height*3];
- tjd.decompress(inputbuf, inputsize, tmpbuf, tji.width, tji.width*3,
- tji.height, 3, TJ.BOTTOMUP);
+ tjd.decompress(inputbuf, inputsize, tmpbuf, tji.width*3,
+ 3, 1, scalefactor, TJ.BOTTOMUP);
tjd.close();
TJCompressor tjc=new TJCompressor();