| Method from java.awt.image.AffineTransformOp Detail: |
|---|
 public BufferedImage createCompatibleDestImage(BufferedImage src,
ColorModel destCM) {
BufferedImage image;
Rectangle r = getBounds2D(src).getBounds();
// If r.x (or r.y) is < 0, then we want to only create an image
// that is in the positive range.
// If r.x (or r.y) is > 0, then we need to create an image that
// includes the translation.
int w = r.x + r.width;
int h = r.y + r.height;
if (w < = 0) {
throw new RasterFormatException("Transformed width ("+w+
") is less than or equal to 0.");
}
if (h < = 0) {
throw new RasterFormatException("Transformed height ("+h+
") is less than or equal to 0.");
}
if (destCM == null) {
ColorModel cm = src.getColorModel();
if (interpolationType != TYPE_NEAREST_NEIGHBOR &&
(cm instanceof IndexColorModel ||
cm.getTransparency() == Transparency.OPAQUE))
{
image = new BufferedImage(w, h,
BufferedImage.TYPE_INT_ARGB);
}
else {
image = new BufferedImage(cm,
src.getRaster().createCompatibleWritableRaster(w,h),
cm.isAlphaPremultiplied(), null);
}
}
else {
image = new BufferedImage(destCM,
destCM.createCompatibleWritableRaster(w,h),
destCM.isAlphaPremultiplied(), null);
}
return image;
}
Creates a zeroed destination image with the correct size and number of
bands. A RasterFormatException may be thrown if the
transformed width or height is equal to 0.
If destCM is null,
an appropriate ColorModel is used; this
ColorModel may have
an alpha channel even if the source ColorModel is opaque. |
public WritableRaster createCompatibleDestRaster(Raster src) {
Rectangle2D r = getBounds2D(src);
return src.createCompatibleWritableRaster((int)r.getX(),
(int)r.getY(),
(int)r.getWidth(),
(int)r.getHeight());
} Creates a zeroed destination Raster with the correct size
and number of bands. A RasterFormatException may be thrown
if the transformed width or height is equal to 0. |
public final BufferedImage filter(BufferedImage src,
BufferedImage dst) {
if (src == null) {
throw new NullPointerException("src image is null");
}
if (src == dst) {
throw new IllegalArgumentException("src image cannot be the "+
"same as the dst image");
}
boolean needToConvert = false;
ColorModel srcCM = src.getColorModel();
ColorModel dstCM;
BufferedImage origDst = dst;
if (dst == null) {
dst = createCompatibleDestImage(src, null);
dstCM = srcCM;
origDst = dst;
}
else {
dstCM = dst.getColorModel();
if (srcCM.getColorSpace().getType() !=
dstCM.getColorSpace().getType())
{
int type = xform.getType();
boolean needTrans = ((type&
(xform.TYPE_MASK_ROTATION|
xform.TYPE_GENERAL_TRANSFORM))
!= 0);
if (! needTrans && type != xform.TYPE_TRANSLATION && type != xform.TYPE_IDENTITY)
{
double[] mtx = new double[4];
xform.getMatrix(mtx);
// Check out the matrix. A non-integral scale will force ARGB
// since the edge conditions can't be guaranteed.
needTrans = (mtx[0] != (int)mtx[0] || mtx[3] != (int)mtx[3]);
}
if (needTrans &&
srcCM.getTransparency() == Transparency.OPAQUE)
{
// Need to convert first
ColorConvertOp ccop = new ColorConvertOp(hints);
BufferedImage tmpSrc = null;
int sw = src.getWidth();
int sh = src.getHeight();
if (dstCM.getTransparency() == Transparency.OPAQUE) {
tmpSrc = new BufferedImage(sw, sh,
BufferedImage.TYPE_INT_ARGB);
}
else {
WritableRaster r =
dstCM.createCompatibleWritableRaster(sw, sh);
tmpSrc = new BufferedImage(dstCM, r,
dstCM.isAlphaPremultiplied(),
null);
}
src = ccop.filter(src, tmpSrc);
}
else {
needToConvert = true;
dst = createCompatibleDestImage(src, null);
}
}
}
if (interpolationType != TYPE_NEAREST_NEIGHBOR &&
dst.getColorModel() instanceof IndexColorModel) {
dst = new BufferedImage(dst.getWidth(), dst.getHeight(),
BufferedImage.TYPE_INT_ARGB);
}
if (ImagingLib.filter(this, src, dst) == null) {
throw new ImagingOpException ("Unable to transform src image");
}
if (needToConvert) {
ColorConvertOp ccop = new ColorConvertOp(hints);
ccop.filter(dst, origDst);
}
else if (origDst != dst) {
java.awt.Graphics2D g = origDst.createGraphics();
try {
g.setComposite(AlphaComposite.Src);
g.drawImage(dst, 0, 0, null);
} finally {
g.dispose();
}
}
return origDst;
} Transforms the source BufferedImage and stores the results
in the destination BufferedImage.
If the color models for the two images do not match, a color
conversion into the destination color model is performed.
If the destination image is null,
a BufferedImage is created with the source
ColorModel.
The coordinates of the rectangle returned by
getBounds2D(BufferedImage)
are not necessarily the same as the coordinates of the
BufferedImage returned by this method. If the
upper-left corner coordinates of the rectangle are
negative then this part of the rectangle is not drawn. If the
upper-left corner coordinates of the rectangle are positive
then the filtered image is drawn at that position in the
destination BufferedImage.
An IllegalArgumentException is thrown if the source is
the same as the destination. |
public final WritableRaster filter(Raster src,
WritableRaster dst) {
if (src == null) {
throw new NullPointerException("src image is null");
}
if (dst == null) {
dst = createCompatibleDestRaster(src);
}
if (src == dst) {
throw new IllegalArgumentException("src image cannot be the "+
"same as the dst image");
}
if (src.getNumBands() != dst.getNumBands()) {
throw new IllegalArgumentException("Number of src bands ("+
src.getNumBands()+
") does not match number of "+
" dst bands ("+
dst.getNumBands()+")");
}
if (ImagingLib.filter(this, src, dst) == null) {
throw new ImagingOpException ("Unable to transform src image");
}
return dst;
} Transforms the source Raster and stores the results in
the destination Raster. This operation performs the
transform band by band.
If the destination Raster is null, a new
Raster is created.
An IllegalArgumentException may be thrown if the source is
the same as the destination or if the number of bands in
the source is not equal to the number of bands in the
destination.
The coordinates of the rectangle returned by
getBounds2D(Raster)
are not necessarily the same as the coordinates of the
WritableRaster returned by this method. If the
upper-left corner coordinates of rectangle are negative then
this part of the rectangle is not drawn. If the coordinates
of the rectangle are positive then the filtered image is drawn at
that position in the destination Raster.
|
public final Rectangle2D getBounds2D(BufferedImage src) {
return getBounds2D(src.getRaster());
} Returns the bounding box of the transformed destination. The
rectangle returned is the actual bounding box of the
transformed points. The coordinates of the upper-left corner
of the returned rectangle might not be (0, 0). |
public final Rectangle2D getBounds2D(Raster src) {
int w = src.getWidth();
int h = src.getHeight();
// Get the bounding box of the src and transform the corners
float[] pts = {0, 0, w, 0, w, h, 0, h};
xform.transform(pts, 0, pts, 0, 4);
// Get the min, max of the dst
float fmaxX = pts[0];
float fmaxY = pts[1];
float fminX = pts[0];
float fminY = pts[1];
for (int i=2; i < 8; i+=2) {
if (pts[i] > fmaxX) {
fmaxX = pts[i];
}
else if (pts[i] < fminX) {
fminX = pts[i];
}
if (pts[i+1] > fmaxY) {
fmaxY = pts[i+1];
}
else if (pts[i+1] < fminY) {
fminY = pts[i+1];
}
}
return new Rectangle2D.Float(fminX, fminY, fmaxX-fminX, fmaxY-fminY);
} Returns the bounding box of the transformed destination. The
rectangle returned will be the actual bounding box of the
transformed points. The coordinates of the upper-left corner
of the returned rectangle might not be (0, 0). |
public final int getInterpolationType() {
return interpolationType;
} Returns the interpolation type used by this op. |
public final Point2D getPoint2D(Point2D srcPt,
Point2D dstPt) {
return xform.transform (srcPt, dstPt);
} Returns the location of the corresponding destination point given a
point in the source. If dstPt is specified, it
is used to hold the return value. |
public final RenderingHints getRenderingHints() {
if (hints == null) {
Object val;
switch(interpolationType) {
case TYPE_NEAREST_NEIGHBOR:
val = RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR;
break;
case TYPE_BILINEAR:
val = RenderingHints.VALUE_INTERPOLATION_BILINEAR;
break;
case TYPE_BICUBIC:
val = RenderingHints.VALUE_INTERPOLATION_BICUBIC;
break;
default:
// Should never get here
throw new InternalError("Unknown interpolation type "+
interpolationType);
}
hints = new RenderingHints(RenderingHints.KEY_INTERPOLATION, val);
}
return hints;
} Returns the rendering hints used by this transform operation. |
public final AffineTransform getTransform() {
return (AffineTransform) xform.clone();
} Returns the affine transform used by this transform operation. |
void validateTransform(AffineTransform xform) {
if (Math.abs(xform.getDeterminant()) < = Double.MIN_VALUE) {
throw new ImagingOpException("Unable to invert transform "+xform);
}
} |
java.awt.image.AffineTransformOp
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