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Expose TurboJPEG scaling features in Java wrapper

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@375 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2011-02-16 03:26:48 +00:00
parent 942029fd93
commit e1303ef099
4 changed files with 38 additions and 8 deletions
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37
java/TJExample.java
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@@ -38,13 +38,33 @@ public class TJExample {
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 @@ public class TJExample {
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();