ryan/mozjpeg
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Support for compressing from/decompressing to a BufferedImage in the Java wrapper

Browse Source
This commit is contained in:
DRC
2011-02-23 12:09:56 +00:00
parent 4802041125
commit a311c1cd21
7 changed files with 441 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
java/org/libjpegturbo/turbojpeg/TJCompressor.java
View File

@@ -28,6 +28,8 @@
package org.libjpegturbo.turbojpeg;
import java.awt.image.*;
public class TJCompressor {
public TJCompressor() throws Exception {
@@ -60,6 +62,50 @@ public class TJCompressor {
flags | TJ.getFlags(bitmapPixelFormat));
}
public int compress(BufferedImage srcImage, byte [] dstBuf, int jpegSubsamp,
int jpegQual, int flags) throws Exception {
if(srcImage == null || flags < 0)
throw new Exception("Invalid argument in decompress()");
flags &= ~(TJ.YUV);
int width = srcImage.getWidth();
int height = srcImage.getHeight();
int pixelFormat; boolean intPixels=false;
switch(srcImage.getType()) {
case BufferedImage.TYPE_3BYTE_BGR:
pixelFormat=TJ.PF_BGR; break;
case BufferedImage.TYPE_BYTE_GRAY:
pixelFormat=TJ.PF_GRAY; break;
case BufferedImage.TYPE_INT_BGR:
pixelFormat=TJ.PF_RGBX; intPixels=true; break;
case BufferedImage.TYPE_INT_RGB:
pixelFormat=TJ.PF_BGRX; intPixels=true; break;
default:
throw new Exception("Unsupported BufferedImage format");
}
WritableRaster wr = srcImage.getRaster();
if(intPixels) {
SinglePixelPackedSampleModel sm =
(SinglePixelPackedSampleModel)srcImage.getSampleModel();
int pitch = sm.getScanlineStride();
DataBufferInt db = (DataBufferInt)wr.getDataBuffer();
int [] buf = db.getData();
return compress(buf, width, pitch, height, dstBuf, jpegSubsamp, jpegQual,
flags | TJ.getFlags(pixelFormat));
}
else {
ComponentSampleModel sm =
(ComponentSampleModel)srcImage.getSampleModel();
int pixelSize = sm.getPixelStride();
if(pixelSize != TJ.pixelSize[pixelFormat])
throw new Exception("Inconsistency between pixel format and pixel size in BufferedImage");
int pitch = sm.getScanlineStride();
DataBufferByte db = (DataBufferByte)wr.getDataBuffer();
byte [] buf = db.getData();
return compress(buf, width, pitch, height, TJ.getPixelSize(pixelFormat),
dstBuf, jpegSubsamp, jpegQual, flags | TJ.getFlags(pixelFormat));
}
}
public void close() throws Exception {
destroy();
}
@@ -83,6 +129,10 @@ public class TJCompressor {
int height, int pixelSize, byte [] dstbuf, int jpegSubsamp, int jpegQual,
int flags) throws Exception;
private native int compress(int [] srcBuf, int width, int pitch,
int height, byte [] dstbuf, int jpegSubsamp, int jpegQual, int flags)
throws Exception;
static {
System.loadLibrary("turbojpeg");
}