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More Java API cleanup

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@519 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2011-03-16 00:02:53 +00:00
parent 92549de2c2
commit 2c74e5124d
13 changed files with 391 additions and 379 deletions
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118
java/org/libjpegturbo/turbojpeg/TJDecompressor.java
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@@ -35,6 +35,9 @@ import java.awt.image.*;
*/
public class TJDecompressor {
private final static String NO_ASSOC_ERROR =
"No JPEG image is associated with this instance";
/**
* Create a TurboJPEG decompresssor instance.
*/
@@ -46,12 +49,12 @@ public class TJDecompressor {
* Create a TurboJPEG decompressor instance and associate the JPEG image
* stored in <code>jpegImage</code> with the newly-created instance.
*
* @param jpegImage JPEG image buffer (size of JPEG image is assumed to be
* the length of the buffer)
* @param jpegImage JPEG image buffer (size of the JPEG image is assumed to
* be the length of the array)
*/
public TJDecompressor(byte[] jpegImage) throws Exception {
init();
setJPEGBuffer(jpegImage, jpegImage.length);
setJPEGImage(jpegImage, jpegImage.length);
}
/**
@@ -61,25 +64,25 @@ public class TJDecompressor {
*
* @param jpegImage JPEG image buffer
*
* @param imageSize size of JPEG image (in bytes)
* @param imageSize size of the JPEG image (in bytes)
*/
public TJDecompressor(byte[] jpegImage, int imageSize) throws Exception {
init();
setJPEGBuffer(jpegImage, imageSize);
setJPEGImage(jpegImage, imageSize);
}
/**
* Associate a JPEG image buffer with this decompressor instance. This
* buffer will be used as the source buffer for subsequent decompress
* operations.
* Associate the JPEG image of length <code>imageSize</code> bytes stored in
* <code>jpegImage</code> with this decompressor instance. This image will
* be used as the source image for subsequent decompress operations.
*
* @param jpegImage JPEG image buffer
*
* @param imageSize size of JPEG image (in bytes)
* @param imageSize size of the JPEG image (in bytes)
*/
public void setJPEGBuffer(byte[] jpegImage, int imageSize) throws Exception {
public void setJPEGImage(byte[] jpegImage, int imageSize) throws Exception {
if(jpegImage == null || imageSize < 1)
throw new Exception("Invalid argument in setJPEGBuffer()");
throw new Exception("Invalid argument in setJPEGImage()");
jpegBuf = jpegImage;
jpegBufSize = imageSize;
decompressHeader(jpegBuf, jpegBufSize);
@@ -93,7 +96,7 @@ public class TJDecompressor {
* instance
*/
public int getWidth() throws Exception {
if(jpegWidth < 1) throw new Exception("JPEG buffer not initialized");
if(jpegWidth < 1) throw new Exception(NO_ASSOC_ERROR);
return jpegWidth;
}
@@ -105,7 +108,7 @@ public class TJDecompressor {
* instance
*/
public int getHeight() throws Exception {
if(jpegHeight < 1) throw new Exception("JPEG buffer not initialized");
if(jpegHeight < 1) throw new Exception(NO_ASSOC_ERROR);
return jpegHeight;
}
@@ -117,8 +120,8 @@ public class TJDecompressor {
* associated with this decompressor instance
*/
public int getSubsamp() throws Exception {
if(jpegSubsamp < 0) throw new Exception("JPEG buffer not initialized");
if(jpegSubsamp >= TJ.NUMSAMPOPT)
if(jpegSubsamp < 0) throw new Exception(NO_ASSOC_ERROR);
if(jpegSubsamp >= TJ.NUMSAMP)
throw new Exception("JPEG header information is invalid");
return jpegSubsamp;
}
@@ -129,7 +132,7 @@ public class TJDecompressor {
* @return the JPEG image buffer associated with this decompressor instance
*/
public byte[] getJPEGBuf() throws Exception {
if(jpegBuf == null) throw new Exception("JPEG buffer not initialized");
if(jpegBuf == null) throw new Exception(NO_ASSOC_ERROR);
return jpegBuf;
}
@@ -141,7 +144,7 @@ public class TJDecompressor {
* decompressor instance
*/
public int getJPEGSize() throws Exception {
if(jpegBufSize < 1) throw new Exception("JPEG buffer not initialized");
if(jpegBufSize < 1) throw new Exception(NO_ASSOC_ERROR);
return jpegBufSize;
}
@@ -152,12 +155,14 @@ public class TJDecompressor {
* height.
*
* @param desiredWidth desired width (in pixels) of the decompressed image.
* If this is set to 0, then only the height will be considered when
* determining the scaled image size.
* Setting this to 0 is the same as setting it to the width of the JPEG image
* (in other words, the width will not be considered when determining the
* scaled image size.)
*
* @param desiredHeight desired height (in pixels) of the decompressed image.
* If this is set to 0, then only the width will be considered when
* determining the scaled image size.
* Setting this to 0 is the same as setting it to the height of the JPEG
* image (in other words, the height will not be considered when determining
* the scaled image size.)
*
* @return the width of the largest scaled down image that the TurboJPEG
* decompressor can generate without exceeding the desired image width and
@@ -166,7 +171,7 @@ public class TJDecompressor {
public int getScaledWidth(int desiredWidth, int desiredHeight)
throws Exception {
if(jpegWidth < 1 || jpegHeight < 1)
throw new Exception("JPEG buffer not initialized");
throw new Exception(NO_ASSOC_ERROR);
if(desiredWidth < 0 || desiredHeight < 0)
throw new Exception("Invalid argument in getScaledWidth()");
TJ.ScalingFactor sf[] = TJ.getScalingFactors();
@@ -190,12 +195,14 @@ public class TJDecompressor {
* height.
*
* @param desiredWidth desired width (in pixels) of the decompressed image.
* If this is set to 0, then only the height will be considered when
* determining the scaled image size.
* Setting this to 0 is the same as setting it to the width of the JPEG image
* (in other words, the width will not be considered when determining the
* scaled image size.)
*
* @param desiredHeight desired height (in pixels) of the decompressed image.
* If this is set to 0, then only the width will be considered when
* determining the scaled image size.
* Setting this to 0 is the same as setting it to the height of the JPEG
* image (in other words, the height will not be considered when determining
* the scaled image size.)
*
* @return the height of the largest scaled down image that the TurboJPEG
* decompressor can generate without exceeding the desired image width and
@@ -204,7 +211,7 @@ public class TJDecompressor {
public int getScaledHeight(int desiredWidth, int desiredHeight)
throws Exception {
if(jpegWidth < 1 || jpegHeight < 1)
throw new Exception("JPEG buffer not initialized");
throw new Exception(NO_ASSOC_ERROR);
if(desiredWidth < 0 || desiredHeight < 0)
throw new Exception("Invalid argument in getScaledHeight()");
TJ.ScalingFactor sf[] = TJ.getScalingFactors();
@@ -236,8 +243,9 @@ public class TJDecompressor {
* If the desired image dimensions are smaller than the dimensions of the
* JPEG image being decompressed, then TurboJPEG will use scaling in the JPEG
* decompressor to generate the largest possible image that will fit within
* the desired dimensions. If desiredWidth is set to 0, then only the height
* will be considered when determining the scaled image size.
* the desired dimensions. Setting this to 0 is the same as setting it to
* the width of the JPEG image (in other words, the width will not be
* considered when determining the scaled image size.)
*
* @param pitch bytes per line of the destination image. Normally, this
* should be set to <code>scaledWidth * TJ.pixelSize(pixelFormat)</code> if
@@ -245,26 +253,26 @@ public class TJDecompressor {
* pad each line of the decompressed image to a 4-byte boundary. NOTE:
* <code>scaledWidth = ceil(jpegWidth * scalingFactor)</code>. Setting this
* parameter to 0 is the equivalent of setting it to
* <code>scaledWidth * pixelSize</code>.
* <code>scaledWidth * TJ.pixelSize(pixelFormat)</code>.
*
* @param desiredHeight desired height (in pixels) of the decompressed image.
* If the desired image dimensions are smaller than the dimensions of the
* JPEG image being decompressed, then TurboJPEG will use scaling in the JPEG
* decompressor to generate the largest possible image that will fit within
* the desired dimensions. If desiredHeight is set to 0, then only the
* width will be considered when determining the scaled image size.
* the desired dimensions. Setting this to 0 is the same as setting it to
* the height of the JPEG image (in other words, the height will not be
* considered when determining the scaled image size.)
*
* @param pixelFormat Pixel format of the decompressed image (see
* {@link TJ})
* @param pixelFormat pixel format of the decompressed image (one of
* {@link TJ TJ.PF_*})
*
* @param flags the bitwise OR of one or more of the flags described in
* {@link TJ}
* @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
*/
public void decompress(byte[] dstBuf, int desiredWidth, int pitch,
int desiredHeight, int pixelFormat, int flags) throws Exception {
if(jpegBuf == null) throw new Exception("JPEG buffer not initialized");
if(jpegBuf == null) throw new Exception(NO_ASSOC_ERROR);
if(dstBuf == null || desiredWidth < 0 || pitch < 0 || desiredHeight < 0
|| pixelFormat < 0 || pixelFormat >= TJ.NUMPFOPT || flags < 0)
|| pixelFormat < 0 || pixelFormat >= TJ.NUMPF || flags < 0)
throw new Exception("Invalid argument in decompress()");
decompress(jpegBuf, jpegBufSize, dstBuf, desiredWidth, pitch,
desiredHeight, pixelFormat, flags);
@@ -283,18 +291,17 @@ public class TJDecompressor {
* @param desiredHeight see
* {@link #decompress(byte[], int, int, int, int, int)} for description
*
* @param pixelFormat Pixel format of the decompressed image (see
* {@link TJ})
* @param pixelFormat pixel format of the decompressed image (one of
* {@link TJ TJ.PF_*})
*
* @param flags the bitwise OR of one or more of the flags described in
* {@link TJ}
* @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
*
* @return a buffer containing the decompressed image
*/
public byte[] decompress(int desiredWidth, int pitch, int desiredHeight,
int pixelFormat, int flags) throws Exception {
if(desiredWidth < 0 || pitch < 0 || desiredHeight < 0
|| pixelFormat < 0 || pixelFormat >= TJ.NUMPFOPT || flags < 0)
|| pixelFormat < 0 || pixelFormat >= TJ.NUMPF || flags < 0)
throw new Exception("Invalid argument in decompress()");
int pixelSize = TJ.getPixelSize(pixelFormat);
int scaledWidth = getScaledWidth(desiredWidth, desiredHeight);
@@ -320,11 +327,10 @@ public class TJDecompressor {
* {@link TJ#bufSizeYUV} to determine the appropriate size for this buffer
* based on the image width, height, and level of chrominance subsampling.
*
* @param flags the bitwise OR of one or more of the flags described in
* {@link TJ}
* @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
*/
public void decompressToYUV(byte[] dstBuf, int flags) throws Exception {
if(jpegBuf == null) throw new Exception("JPEG buffer not initialized");
if(jpegBuf == null) throw new Exception(NO_ASSOC_ERROR);
if(dstBuf == null || flags < 0)
throw new Exception("Invalid argument in decompressToYUV()");
decompressToYUV(jpegBuf, jpegBufSize, dstBuf, flags);
@@ -336,8 +342,7 @@ public class TJDecompressor {
* instance and return a buffer containing a YUV planar image. See {@link
* #decompressToYUV(byte[], int)} for more detail.
*
* @param flags the bitwise OR of one or more of the flags described in
* {@link TJ}
* @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
*
* @return a buffer containing a YUV planar image
*/
@@ -345,8 +350,8 @@ public class TJDecompressor {
if(flags < 0)
throw new Exception("Invalid argument in decompressToYUV()");
if(jpegWidth < 1 || jpegHeight < 1 || jpegSubsamp < 0)
throw new Exception("JPEG buffer not initialized");
if(jpegSubsamp >= TJ.NUMSAMPOPT)
throw new Exception(NO_ASSOC_ERROR);
if(jpegSubsamp >= TJ.NUMSAMP)
throw new Exception("JPEG header information is invalid");
byte[] buf = new byte[TJ.bufSizeYUV(jpegWidth, jpegHeight, jpegSubsamp)];
decompressToYUV(buf, flags);
@@ -361,8 +366,7 @@ public class TJDecompressor {
* @param dstImage a <code>BufferedImage</code> instance which will receive
* the decompressed image
*
* @param flags the bitwise OR of one or more of the flags described in
* {@link TJ}
* @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
*/
public void decompress(BufferedImage dstImage, int flags) throws Exception {
if(dstImage == null || flags < 0)
@@ -393,7 +397,7 @@ public class TJDecompressor {
int pitch = sm.getScanlineStride();
DataBufferInt db = (DataBufferInt)wr.getDataBuffer();
int[] buf = db.getData();
if(jpegBuf == null) throw new Exception("JPEG buffer not initialized");
if(jpegBuf == null) throw new Exception(NO_ASSOC_ERROR);
decompress(jpegBuf, jpegBufSize, buf, scaledWidth, pitch, scaledHeight,
pixelFormat, flags);
}
@@ -421,11 +425,11 @@ public class TJDecompressor {
* @param desiredHeight see
* {@link #decompress(byte[], int, int, int, int, int)} for description
*
* @param bufferedImageType the image type of the <code>BufferedImage</code>
* instance to create (for instance, <code>BufferedImage.TYPE_INT_RGB</code>)
* @param bufferedImageType the image type of the newly-created
* <code>BufferedImage</code> instance (for instance,
* <code>BufferedImage.TYPE_INT_RGB</code>)
*
* @param flags the bitwise OR of one or more of the flags described in
* {@link TJ}
* @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
*
* @return a <code>BufferedImage</code> instance containing the
* decompressed image