IndexColorModelpublic class IndexColorModel extends ColorModel The IndexColorModel class is a ColorModel
class that works with pixel values consisting of a
single sample that is an index into a fixed colormap in the default
sRGB color space. The colormap specifies red, green, blue, and
optional alpha components corresponding to each index. All components
are represented in the colormap as 8-bit unsigned integral values.
Some constructors allow the caller to specify "holes" in the colormap
by indicating which colormap entries are valid and which represent
unusable colors via the bits set in a BigInteger object.
This color model is similar to an X11 PseudoColor visual.
Some constructors provide a means to specify an alpha component
for each pixel in the colormap, while others either provide no
such means or, in some cases, a flag to indicate whether the
colormap data contains alpha values. If no alpha is supplied to
the constructor, an opaque alpha component (alpha = 1.0) is
assumed for each entry.
An optional transparent pixel value can be supplied that indicates a
pixel to be made completely transparent, regardless of any alpha
component supplied or assumed for that pixel value.
Note that the color components in the colormap of an
IndexColorModel objects are never pre-multiplied with
the alpha components.
The transparency of an IndexColorModel object is
determined by examining the alpha components of the colors in the
colormap and choosing the most specific value after considering
the optional alpha values and any transparent index specified.
The transparency value is Transparency.OPAQUE
only if all valid colors in
the colormap are opaque and there is no valid transparent pixel.
If all valid colors
in the colormap are either completely opaque (alpha = 1.0) or
completely transparent (alpha = 0.0), which typically occurs when
a valid transparent pixel is specified,
the value is Transparency.BITMASK.
Otherwise, the value is Transparency.TRANSLUCENT, indicating
that some valid color has an alpha component that is
neither completely transparent nor completely opaque
(0.0 < alpha < 1.0).
If an IndexColorModel object has
a transparency value of Transparency.OPAQUE,
then the hasAlpha
and getNumComponents methods
(both inherited from ColorModel)
return false and 3, respectively.
For any other transparency value,
hasAlpha returns true
and getNumComponents returns 4.
The values used to index into the colormap are taken from the least
significant n bits of pixel representations where
n is based on the pixel size specified in the constructor.
For pixel sizes smaller than 8 bits, n is rounded up to a
power of two (3 becomes 4 and 5,6,7 become 8).
For pixel sizes between 8 and 16 bits, n is equal to the
pixel size.
Pixel sizes larger than 16 bits are not supported by this class.
Higher order bits beyond n are ignored in pixel representations.
Index values greater than or equal to the map size, but less than
2n, are undefined and return 0 for all color and
alpha components.
For those methods that use a primitive array pixel representation of
type transferType, the array length is always one.
The transfer types supported are DataBuffer.TYPE_BYTE and
DataBuffer.TYPE_USHORT. A single int pixel
representation is valid for all objects of this class, since it is
always possible to represent pixel values used with this class in a
single int. Therefore, methods that use this representation do
not throw an IllegalArgumentException due to an invalid
pixel value.
Many of the methods in this class are final. The reason for
this is that the underlying native graphics code makes assumptions
about the layout and operation of this class and those assumptions
are reflected in the implementations of the methods here that are
marked final. You can subclass this class for other reasons, but
you cannot override or modify the behaviour of those methods. |
| Fields Summary |
|---|
| private int[] | rgb | | private int | map_size | | private int | pixel_mask | | private int | transparent_index | | private boolean | allgrayopaque | | private BigInteger | validBits | | private static int[] | opaqueBits | | private static int[] | alphaBits | | private static final int | CACHESIZE | | private int[] | lookupcache |
| Constructors Summary |
|---|
public IndexColorModel(int bits, int size, byte[] r, byte[] g, byte[] b)Constructs an IndexColorModel from the specified
arrays of red, green, and blue components. Pixels described
by this color model all have alpha components of 255
unnormalized (1.0 normalized), which means they
are fully opaque. All of the arrays specifying the color
components must have at least the specified number of entries.
The ColorSpace is the default sRGB space.
Since there is no alpha information in any of the arguments
to this constructor, the transparency value is always
Transparency.OPAQUE.
The transfer type is the smallest of DataBuffer.TYPE_BYTE
or DataBuffer.TYPE_USHORT that can hold a single pixel.
ColorModel.loadLibraries();
initIDs();
super(bits, opaqueBits,
ColorSpace.getInstance(ColorSpace.CS_sRGB),
false, false, OPAQUE,
ColorModel.getDefaultTransferType(bits));
if (bits < 1 || bits > 16) {
throw new IllegalArgumentException("Number of bits must be between"
+" 1 and 16.");
}
setRGBs(size, r, g, b, null);
calculatePixelMask();
| public IndexColorModel(int bits, int size, byte[] r, byte[] g, byte[] b, int trans)Constructs an IndexColorModel from the given arrays
of red, green, and blue components. Pixels described by this color
model all have alpha components of 255 unnormalized
(1.0 normalized), which means they are fully opaque, except
for the indicated pixel to be made transparent. All of the arrays
specifying the color components must have at least the specified
number of entries.
The ColorSpace is the default sRGB space.
The transparency value may be Transparency.OPAQUE or
Transparency.BITMASK depending on the arguments, as
specified in the class description above.
The transfer type is the smallest of DataBuffer.TYPE_BYTE
or DataBuffer.TYPE_USHORT that can hold a
single pixel.
super(bits, opaqueBits,
ColorSpace.getInstance(ColorSpace.CS_sRGB),
false, false, OPAQUE,
ColorModel.getDefaultTransferType(bits));
if (bits < 1 || bits > 16) {
throw new IllegalArgumentException("Number of bits must be between"
+" 1 and 16.");
}
setRGBs(size, r, g, b, null);
setTransparentPixel(trans);
calculatePixelMask();
| public IndexColorModel(int bits, int size, byte[] r, byte[] g, byte[] b, byte[] a)Constructs an IndexColorModel from the given
arrays of red, green, blue and alpha components. All of the
arrays specifying the components must have at least the specified
number of entries.
The ColorSpace is the default sRGB space.
The transparency value may be any of Transparency.OPAQUE,
Transparency.BITMASK,
or Transparency.TRANSLUCENT
depending on the arguments, as specified
in the class description above.
The transfer type is the smallest of DataBuffer.TYPE_BYTE
or DataBuffer.TYPE_USHORT that can hold a single pixel.
super (bits, alphaBits,
ColorSpace.getInstance(ColorSpace.CS_sRGB),
true, false, TRANSLUCENT,
ColorModel.getDefaultTransferType(bits));
if (bits < 1 || bits > 16) {
throw new IllegalArgumentException("Number of bits must be between"
+" 1 and 16.");
}
setRGBs (size, r, g, b, a);
calculatePixelMask();
| public IndexColorModel(int bits, int size, byte[] cmap, int start, boolean hasalpha)Constructs an IndexColorModel from a single
array of interleaved red, green, blue and optional alpha
components. The array must have enough values in it to
fill all of the needed component arrays of the specified
size. The ColorSpace is the default sRGB space.
The transparency value may be any of Transparency.OPAQUE,
Transparency.BITMASK,
or Transparency.TRANSLUCENT
depending on the arguments, as specified
in the class description above.
The transfer type is the smallest of
DataBuffer.TYPE_BYTE or DataBuffer.TYPE_USHORT
that can hold a single pixel.
this(bits, size, cmap, start, hasalpha, -1);
if (bits < 1 || bits > 16) {
throw new IllegalArgumentException("Number of bits must be between"
+" 1 and 16.");
}
| public IndexColorModel(int bits, int size, byte[] cmap, int start, boolean hasalpha, int trans)Constructs an IndexColorModel from a single array of
interleaved red, green, blue and optional alpha components. The
specified transparent index represents a pixel that is made
entirely transparent regardless of any alpha value specified
for it. The array must have enough values in it to fill all
of the needed component arrays of the specified size.
The ColorSpace is the default sRGB space.
The transparency value may be any of Transparency.OPAQUE,
Transparency.BITMASK,
or Transparency.TRANSLUCENT
depending on the arguments, as specified
in the class description above.
The transfer type is the smallest of
DataBuffer.TYPE_BYTE or DataBuffer.TYPE_USHORT
that can hold a single pixel.
// REMIND: This assumes the ordering: RGB[A]
super(bits, opaqueBits,
ColorSpace.getInstance(ColorSpace.CS_sRGB),
false, false, OPAQUE,
ColorModel.getDefaultTransferType(bits));
if (bits < 1 || bits > 16) {
throw new IllegalArgumentException("Number of bits must be between"
+" 1 and 16.");
}
if (size < 1) {
throw new IllegalArgumentException("Map size ("+size+
") must be >= 1");
}
map_size = size;
rgb = new int[calcRealMapSize(bits, size)];
int j = start;
int alpha = 0xff;
boolean allgray = true;
int transparency = OPAQUE;
for (int i = 0; i < size; i++) {
int r = cmap[j++] & 0xff;
int g = cmap[j++] & 0xff;
int b = cmap[j++] & 0xff;
allgray = allgray && (r == g) && (g == b);
if (hasalpha) {
alpha = cmap[j++] & 0xff;
if (alpha != 0xff) {
if (alpha == 0x00) {
if (transparency == OPAQUE) {
transparency = BITMASK;
}
if (transparent_index < 0) {
transparent_index = i;
}
} else {
transparency = TRANSLUCENT;
}
allgray = false;
}
}
rgb[i] = (alpha << 24) | (r << 16) | (g << 8) | b;
}
this.allgrayopaque = allgray;
setTransparency(transparency);
setTransparentPixel(trans);
calculatePixelMask();
| public IndexColorModel(int bits, int size, int[] cmap, int start, boolean hasalpha, int trans, int transferType)Constructs an IndexColorModel from an array of
ints where each int is comprised of red, green, blue, and
optional alpha components in the default RGB color model format.
The specified transparent index represents a pixel that is made
entirely transparent regardless of any alpha value specified
for it. The array must have enough values in it to fill all
of the needed component arrays of the specified size.
The ColorSpace is the default sRGB space.
The transparency value may be any of Transparency.OPAQUE,
Transparency.BITMASK,
or Transparency.TRANSLUCENT
depending on the arguments, as specified
in the class description above.
// REMIND: This assumes the ordering: RGB[A]
super(bits, opaqueBits,
ColorSpace.getInstance(ColorSpace.CS_sRGB),
false, false, OPAQUE,
transferType);
if (bits < 1 || bits > 16) {
throw new IllegalArgumentException("Number of bits must be between"
+" 1 and 16.");
}
if (size < 1) {
throw new IllegalArgumentException("Map size ("+size+
") must be >= 1");
}
if ((transferType != DataBuffer.TYPE_BYTE) &&
(transferType != DataBuffer.TYPE_USHORT)) {
throw new IllegalArgumentException("transferType must be either" +
"DataBuffer.TYPE_BYTE or DataBuffer.TYPE_USHORT");
}
setRGBs(size, cmap, start, hasalpha);
setTransparentPixel(trans);
calculatePixelMask();
| public IndexColorModel(int bits, int size, int[] cmap, int start, int transferType, BigInteger validBits)Constructs an IndexColorModel from an
int array where each int is
comprised of red, green, blue, and alpha
components in the default RGB color model format.
The array must have enough values in it to fill all
of the needed component arrays of the specified size.
The ColorSpace is the default sRGB space.
The transparency value may be any of Transparency.OPAQUE,
Transparency.BITMASK,
or Transparency.TRANSLUCENT
depending on the arguments, as specified
in the class description above.
The transfer type must be one of DataBuffer.TYPE_BYTE
DataBuffer.TYPE_USHORT.
The BigInteger object specifies the valid/invalid pixels
in the cmap array. A pixel is valid if the
BigInteger value at that index is set, and is invalid
if the BigInteger bit at that index is not set.
super (bits, alphaBits,
ColorSpace.getInstance(ColorSpace.CS_sRGB),
true, false, TRANSLUCENT,
transferType);
if (bits < 1 || bits > 16) {
throw new IllegalArgumentException("Number of bits must be between"
+" 1 and 16.");
}
if (size < 1) {
throw new IllegalArgumentException("Map size ("+size+
") must be >= 1");
}
if ((transferType != DataBuffer.TYPE_BYTE) &&
(transferType != DataBuffer.TYPE_USHORT)) {
throw new IllegalArgumentException("transferType must be either" +
"DataBuffer.TYPE_BYTE or DataBuffer.TYPE_USHORT");
}
if (validBits != null) {
// Check to see if it is all valid
for (int i=0; i < size; i++) {
if (!validBits.testBit(i)) {
this.validBits = validBits;
break;
}
}
}
setRGBs(size, cmap, start, true);
calculatePixelMask();
|
| Methods Summary |
|---|
| private int | calcRealMapSize(int bits, int size)
int newSize = Math.max(1 << bits, size);
return Math.max(newSize, 256);
| | private final void | calculatePixelMask()This method is called from the constructors to set the pixel_mask
value, which is based on the value of pixel_bits. The pixel_mask
value is used to mask off the pixel parameters for methods such
as getRed(), getGreen(), getBlue(), getAlpha(), and getRGB().
// Note that we adjust the mask so that our masking behavior here
// is consistent with that of our native rendering loops.
int maskbits = pixel_bits;
if (maskbits == 3) {
maskbits = 4;
} else if (maskbits > 4 && maskbits < 8) {
maskbits = 8;
}
pixel_mask = (1 << maskbits) - 1;
| | public java.awt.image.BufferedImage | convertToIntDiscrete(java.awt.image.Raster raster, boolean forceARGB)Returns a new BufferedImage of TYPE_INT_ARGB or
TYPE_INT_RGB that has a Raster with pixel data
computed by expanding the indices in the source Raster
using the color/alpha component arrays of this ColorModel.
Only the lower n bits of each index value in the source
Raster, as specified in the
class description above, are used to
compute the color/alpha values in the returned image.
If forceARGB is true, a TYPE_INT_ARGB image is
returned regardless of whether or not this ColorModel
has an alpha component array or a transparent pixel.
ColorModel cm;
if (!isCompatibleRaster(raster)) {
throw new IllegalArgumentException("This raster is not compatible" +
"with this IndexColorModel.");
}
if (forceARGB || transparency == TRANSLUCENT) {
cm = ColorModel.getRGBdefault();
}
else if (transparency == BITMASK) {
cm = new DirectColorModel(25, 0xff0000, 0x00ff00, 0x0000ff,
0x1000000);
}
else {
cm = new DirectColorModel(24, 0xff0000, 0x00ff00, 0x0000ff);
}
int w = raster.getWidth();
int h = raster.getHeight();
WritableRaster discreteRaster =
cm.createCompatibleWritableRaster(w, h);
Object obj = null;
int[] data = null;
int rX = raster.getMinX();
int rY = raster.getMinY();
for (int y=0; y < h; y++, rY++) {
obj = raster.getDataElements(rX, rY, w, 1, obj);
if (obj instanceof int[]) {
data = (int[])obj;
} else {
data = DataBuffer.toIntArray(obj);
}
for (int x=0; x < w; x++) {
data[x] = rgb[data[x] & pixel_mask];
}
discreteRaster.setDataElements(0, y, w, 1, data);
}
return new BufferedImage(cm, discreteRaster, false, null);
| | public java.awt.image.SampleModel | createCompatibleSampleModel(int w, int h)Creates a SampleModel with the specified
width and height that has a data layout compatible with
this ColorModel.
int[] off = new int[1];
off[0] = 0;
if (pixel_bits == 1 || pixel_bits == 2 || pixel_bits == 4) {
return new MultiPixelPackedSampleModel(transferType, w, h,
pixel_bits);
}
else {
return new ComponentSampleModel(transferType, w, h, 1, w,
off);
}
| | public java.awt.image.WritableRaster | createCompatibleWritableRaster(int w, int h)Creates a WritableRaster with the specified width
and height that has a data layout (SampleModel)
compatible with this ColorModel. This method
only works for color models with 16 or fewer bits per pixel.
Since IndexColorModel can be subclassed, any
subclass that supports greater than 16 bits per pixel must
override this method.
WritableRaster raster;
if (pixel_bits == 1 || pixel_bits == 2 || pixel_bits == 4) {
// TYPE_BINARY
raster = Raster.createPackedRaster(DataBuffer.TYPE_BYTE,
w, h, 1, pixel_bits, null);
}
else if (pixel_bits <= 8) {
raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE,
w,h,1,null);
}
else if (pixel_bits <= 16) {
raster = Raster.createInterleavedRaster(DataBuffer.TYPE_USHORT,
w,h,1,null);
}
else {
throw new
UnsupportedOperationException("This method is not supported "+
" for pixel bits > 16.");
}
return raster;
| | public void | finalize()Disposes of system resources associated with this
ColorModel once this ColorModel is no
longer referenced.
sun.awt.image.BufImgSurfaceData.freeNativeICMData(this);
| | private java.math.BigInteger | getAllValid()
int numbytes = (map_size+7)/8;
byte[] valid = new byte[numbytes];
java.util.Arrays.fill(valid, (byte)0xff);
valid[0] = (byte)(0xff >>> (numbytes*8 - map_size));
return new BigInteger(1, valid);
| | public final int | getAlpha(int pixel)Returns the alpha component for the specified pixel, scaled
from 0 to 255. The pixel value is specified as an int.
Only the lower n bits of the pixel value, as specified in the
class description above, are used to
calculate the returned value.
return (rgb[pixel & pixel_mask] >> 24) & 0xff;
| | public final void | getAlphas(byte[] a)Copies the array of alpha transparency components into the
specified array. Only the initial entries of the array as specified
by getMapSize are written.
for (int i = 0; i < map_size; i++) {
a[i] = (byte) (rgb[i] >> 24);
}
| | public final int | getBlue(int pixel)Returns the blue color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB. The pixel value
is specified as an int.
Only the lower n bits of the pixel value, as specified in the
class description above, are used to
calculate the returned value.
The returned value is a non pre-multiplied value.
return rgb[pixel & pixel_mask] & 0xff;
| | public final void | getBlues(byte[] b)Copies the array of blue color components into the specified array.
Only the initial entries of the array as specified by
getMapSize are written.
for (int i = 0; i < map_size; i++) {
b[i] = (byte) rgb[i];
}
| | public int[] | getComponentSize()Returns an array of the number of bits for each color/alpha component.
The array contains the color components in the order red, green,
blue, followed by the alpha component, if present.
if (nBits == null) {
if (supportsAlpha) {
nBits = new int[4];
nBits[3] = 8;
}
else {
nBits = new int[3];
}
nBits[0] = nBits[1] = nBits[2] = 8;
}
return nBits;
| | public int[] | getComponents(int pixel, int[] components, int offset)Returns an array of unnormalized color/alpha components for a
specified pixel in this ColorModel. The pixel value
is specified as an int. If the components array is null,
a new array is allocated that contains
offset + getNumComponents() elements.
The components array is returned,
with the alpha component included
only if hasAlpha returns true.
Color/alpha components are stored in the components array starting
at offset even if the array is allocated by this method.
An ArrayIndexOutOfBoundsException
is thrown if the components array is not null and is
not large enough to hold all the color and alpha components
starting at offset.
if (components == null) {
components = new int[offset+numComponents];
}
// REMIND: Needs to change if different color space
components[offset+0] = getRed(pixel);
components[offset+1] = getGreen(pixel);
components[offset+2] = getBlue(pixel);
if (supportsAlpha && (components.length-offset) > 3) {
components[offset+3] = getAlpha(pixel);
}
return components;
| | public int[] | getComponents(java.lang.Object pixel, int[] components, int offset)Returns an array of unnormalized color/alpha components for
a specified pixel in this ColorModel. The pixel
value is specified by an array of data elements of type
transferType passed in as an object reference.
If pixel is not a primitive array of type
transferType, a ClassCastException
is thrown. An ArrayIndexOutOfBoundsException
is thrown if pixel is not large enough to hold
a pixel value for this ColorModel. If the
components array is null, a new array
is allocated that contains
offset + getNumComponents() elements.
The components array is returned,
with the alpha component included
only if hasAlpha returns true.
Color/alpha components are stored in the components
array starting at offset even if the array is
allocated by this method. An
ArrayIndexOutOfBoundsException is also
thrown if the components array is not
null and is not large enough to hold all the color
and alpha components starting at offset.
Since IndexColorModel can be subclassed, subclasses
inherit the implementation of this method and if they don't
override it then they throw an exception if they use an
unsupported transferType.
int intpixel;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte bdata[] = (byte[])pixel;
intpixel = bdata[0] & 0xff;
break;
case DataBuffer.TYPE_USHORT:
short sdata[] = (short[])pixel;
intpixel = sdata[0] & 0xffff;
break;
case DataBuffer.TYPE_INT:
int idata[] = (int[])pixel;
intpixel = idata[0];
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
return getComponents(intpixel, components, offset);
| | public int | getDataElement(int[] components, int offset)Returns a pixel value represented as an int in this
ColorModel given an array of unnormalized
color/alpha components. An
ArrayIndexOutOfBoundsException
is thrown if the components array is not large
enough to hold all of the color and alpha components starting
at offset. Since
ColorModel can be subclassed, subclasses inherit the
implementation of this method and if they don't override it then
they throw an exception if they use an unsupported transferType.
int rgb = (components[offset+0]<<16)
| (components[offset+1]<<8) | (components[offset+2]);
if (supportsAlpha) {
rgb |= (components[offset+3]<<24);
}
else {
rgb |= 0xff000000;
}
Object inData = getDataElements(rgb, null);
int pixel;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte bdata[] = (byte[])inData;
pixel = bdata[0] & 0xff;
break;
case DataBuffer.TYPE_USHORT:
short sdata[] = (short[])inData;
pixel = sdata[0];
break;
case DataBuffer.TYPE_INT:
int idata[] = (int[])inData;
pixel = idata[0];
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
return pixel;
| | public synchronized java.lang.Object | getDataElements(int rgb, java.lang.Object pixel)Returns a data element array representation of a pixel in this
ColorModel, given an integer pixel representation in the
default RGB color model. This array can then be passed to the
{@link WritableRaster#setDataElements(int, int, java.lang.Object) setDataElements}
method of a {@link WritableRaster} object. If the pixel variable is
null, a new array is allocated. If pixel
is not null, it must be
a primitive array of type transferType; otherwise, a
ClassCastException is thrown. An
ArrayIndexOutOfBoundsException is
thrown if pixel is not large enough to hold a pixel
value for this ColorModel. The pixel array is returned.
Since IndexColorModel can be subclassed, subclasses
inherit the implementation of this method and if they don't
override it then they throw an exception if they use an
unsupported transferType.
int red = (rgb>>16) & 0xff;
int green = (rgb>>8) & 0xff;
int blue = rgb & 0xff;
int alpha = (rgb>>>24);
int pix = 0;
// Note that pixels are stored at lookupcache[2*i]
// and the rgb that was searched is stored at
// lookupcache[2*i+1]. Also, the pixel is first
// inverted using the unary complement operator
// before storing in the cache so it can never be 0.
for (int i = CACHESIZE - 2; i >= 0; i -= 2) {
if ((pix = lookupcache[i]) == 0) {
break;
}
if (rgb == lookupcache[i+1]) {
return installpixel(pixel, ~pix);
}
}
if (allgrayopaque) {
// IndexColorModel objects are all tagged as
// non-premultiplied so ignore the alpha value
// of the incoming color, convert the
// non-premultiplied color components to a
// grayscale value and search for the closest
// gray value in the palette. Since all colors
// in the palette are gray, we only need compare
// to one of the color components for a match
// using a simple linear distance formula.
int minDist = 256;
int d;
int gray = (int) (red*77 + green*150 + blue*29 + 128)/256;
for (int i = 0; i < map_size; i++) {
if (this.rgb[i] == 0x0) {
// For allgrayopaque colormaps, entries are 0
// iff they are an invalid color and should be
// ignored during color searches.
continue;
}
d = (this.rgb[i] & 0xff) - gray;
if (d < 0) d = -d;
if (d < minDist) {
pix = i;
if (d == 0) {
break;
}
minDist = d;
}
}
} else if (transparency == OPAQUE) {
// IndexColorModel objects are all tagged as
// non-premultiplied so ignore the alpha value
// of the incoming color and search for closest
// color match independently using a 3 component
// Euclidean distance formula.
// For opaque colormaps, palette entries are 0
// iff they are an invalid color and should be
// ignored during color searches.
// As an optimization, exact color searches are
// likely to be fairly common in opaque colormaps
// so first we will do a quick search for an
// exact match.
int smallestError = Integer.MAX_VALUE;
int lut[] = this.rgb;
int lutrgb;
for (int i=0; i < map_size; i++) {
lutrgb = lut[i];
if (lutrgb == rgb && lutrgb != 0) {
pix = i;
smallestError = 0;
break;
}
}
if (smallestError != 0) {
for (int i=0; i < map_size; i++) {
lutrgb = lut[i];
if (lutrgb == 0) {
continue;
}
int tmp = ((lutrgb >> 16) & 0xff) - red;
int currentError = tmp*tmp;
if (currentError < smallestError) {
tmp = ((lutrgb >> 8) & 0xff) - green;
currentError += tmp * tmp;
if (currentError < smallestError) {
tmp = (lutrgb & 0xff) - blue;
currentError += tmp * tmp;
if (currentError < smallestError) {
pix = i;
smallestError = currentError;
}
}
}
}
}
} else if (alpha == 0 && transparent_index >= 0) {
// Special case - transparent color maps to the
// specified transparent pixel, if there is one
pix = transparent_index;
} else {
// IndexColorModel objects are all tagged as
// non-premultiplied so use non-premultiplied
// color components in the distance calculations.
// Look for closest match using a 4 component
// Euclidean distance formula.
int smallestError = Integer.MAX_VALUE;
int lut[] = this.rgb;
for (int i=0; i < map_size; i++) {
int lutrgb = lut[i];
if (lutrgb == rgb) {
if (validBits != null && !validBits.testBit(i)) {
continue;
}
pix = i;
break;
}
int tmp = ((lutrgb >> 16) & 0xff) - red;
int currentError = tmp*tmp;
if (currentError < smallestError) {
tmp = ((lutrgb >> 8) & 0xff) - green;
currentError += tmp * tmp;
if (currentError < smallestError) {
tmp = (lutrgb & 0xff) - blue;
currentError += tmp * tmp;
if (currentError < smallestError) {
tmp = (lutrgb >>> 24) - alpha;
currentError += tmp * tmp;
if (currentError < smallestError &&
(validBits == null || validBits.testBit(i)))
{
pix = i;
smallestError = currentError;
}
}
}
}
}
}
System.arraycopy(lookupcache, 2, lookupcache, 0, CACHESIZE - 2);
lookupcache[CACHESIZE - 1] = rgb;
lookupcache[CACHESIZE - 2] = ~pix;
return installpixel(pixel, pix);
| | public java.lang.Object | getDataElements(int[] components, int offset, java.lang.Object pixel)Returns a data element array representation of a pixel in this
ColorModel given an array of unnormalized color/alpha
components. This array can then be passed to the
setDataElements method of a WritableRaster
object. An ArrayIndexOutOfBoundsException is
thrown if the
components array is not large enough to hold all of the
color and alpha components starting at offset.
If the pixel variable is null, a new array
is allocated. If pixel is not null,
it must be a primitive array of type transferType;
otherwise, a ClassCastException is thrown.
An ArrayIndexOutOfBoundsException is thrown if pixel
is not large enough to hold a pixel value for this
ColorModel.
Since IndexColorModel can be subclassed, subclasses
inherit the implementation of this method and if they don't
override it then they throw an exception if they use an
unsupported transferType
int rgb = (components[offset+0]<<16) | (components[offset+1]<<8)
| (components[offset+2]);
if (supportsAlpha) {
rgb |= (components[offset+3]<<24);
}
else {
rgb &= 0xff000000;
}
return getDataElements(rgb, pixel);
| | public final int | getGreen(int pixel)Returns the green color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB. The pixel value
is specified as an int.
Only the lower n bits of the pixel value, as specified in the
class description above, are used to
calculate the returned value.
The returned value is a non pre-multiplied value.
return (rgb[pixel & pixel_mask] >> 8) & 0xff;
| | public final void | getGreens(byte[] g)Copies the array of green color components into the specified array.
Only the initial entries of the array as specified by
getMapSize are written.
for (int i = 0; i < map_size; i++) {
g[i] = (byte) (rgb[i] >> 8);
}
| | public final int | getMapSize()Returns the size of the color/alpha component arrays in this
IndexColorModel.
return map_size;
| | public final int | getRGB(int pixel)Returns the color/alpha components of the pixel in the default
RGB color model format. The pixel value is specified as an int.
Only the lower n bits of the pixel value, as specified in the
class description above, are used to
calculate the returned value.
The returned value is in a non pre-multiplied format.
return rgb[pixel & pixel_mask];
| | public final void | getRGBs(int[] rgb)Converts data for each index from the color and alpha component
arrays to an int in the default RGB ColorModel format and copies
the resulting 32-bit ARGB values into the specified array. Only
the initial entries of the array as specified by
getMapSize are
written.
System.arraycopy(this.rgb, 0, rgb, 0, map_size);
| | public final int | getRed(int pixel)Returns the red color component for the specified pixel, scaled
from 0 to 255 in the default RGB ColorSpace, sRGB. The pixel value
is specified as an int.
Only the lower n bits of the pixel value, as specified in the
class description above, are used to
calculate the returned value.
The returned value is a non pre-multiplied value.
return (rgb[pixel & pixel_mask] >> 16) & 0xff;
| | public final void | getReds(byte[] r)Copies the array of red color components into the specified array.
Only the initial entries of the array as specified by
{@link #getMapSize() getMapSize} are written.
for (int i = 0; i < map_size; i++) {
r[i] = (byte) (rgb[i] >> 16);
}
| | public int | getTransparency()Returns the transparency. Returns either OPAQUE, BITMASK,
or TRANSLUCENT
return transparency;
| | public final int | getTransparentPixel()Returns the index of a transparent pixel in this
IndexColorModel or -1 if there is no pixel
with an alpha value of 0. If a transparent pixel was
explicitly specified in one of the constructors by its
index, then that index will be preferred, otherwise,
the index of any pixel which happens to be fully transparent
may be returned.
return transparent_index;
| | public java.math.BigInteger | getValidPixels()Returns a BigInteger that indicates the valid/invalid
pixels in the colormap. A bit is valid if the
BigInteger value at that index is set, and is invalid
if the BigInteger value at that index is not set.
The only valid ranges to query in the BigInteger are
between 0 and the map size.
if (validBits == null) {
return getAllValid();
}
else {
return validBits;
}
| | private static native void | initIDs()
| | private java.lang.Object | installpixel(java.lang.Object pixel, int pix)
switch (transferType) {
case DataBuffer.TYPE_INT:
int[] intObj;
if (pixel == null) {
pixel = intObj = new int[1];
} else {
intObj = (int[]) pixel;
}
intObj[0] = pix;
break;
case DataBuffer.TYPE_BYTE:
byte[] byteObj;
if (pixel == null) {
pixel = byteObj = new byte[1];
} else {
byteObj = (byte[]) pixel;
}
byteObj[0] = (byte) pix;
break;
case DataBuffer.TYPE_USHORT:
short[] shortObj;
if (pixel == null) {
pixel = shortObj = new short[1];
} else {
shortObj = (short[]) pixel;
}
shortObj[0] = (short) pix;
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
return pixel;
| | public boolean | isCompatibleRaster(java.awt.image.Raster raster)Returns true if raster is compatible
with this ColorModel or false if it
is not compatible with this ColorModel.
int size = raster.getSampleModel().getSampleSize(0);
return ((raster.getTransferType() == transferType) &&
(raster.getNumBands() == 1) && ((1 << size) >= map_size));
| | public boolean | isCompatibleSampleModel(java.awt.image.SampleModel sm)Checks if the specified SampleModel is compatible
with this ColorModel. If sm is
null, this method returns false.
// fix 4238629
if (! (sm instanceof ComponentSampleModel) &&
! (sm instanceof MultiPixelPackedSampleModel) ) {
return false;
}
// Transfer type must be the same
if (sm.getTransferType() != transferType) {
return false;
}
if (sm.getNumBands() != 1) {
return false;
}
return true;
| | public boolean | isValid(int pixel)Returns whether or not the pixel is valid.
return ((pixel >= 0 && pixel < map_size) &&
(validBits == null || validBits.testBit(pixel)));
| | public boolean | isValid()Returns whether or not all of the pixels are valid.
return (validBits == null);
| | private void | setRGBs(int size, int[] cmap, int start, boolean hasalpha)
map_size = size;
rgb = new int[calcRealMapSize(pixel_bits, size)];
int j = start;
int transparency = OPAQUE;
boolean allgray = true;
BigInteger validBits = this.validBits;
for (int i = 0; i < size; i++, j++) {
if (validBits != null && !validBits.testBit(i)) {
continue;
}
int cmaprgb = cmap[j];
int r = (cmaprgb >> 16) & 0xff;
int g = (cmaprgb >> 8) & 0xff;
int b = (cmaprgb ) & 0xff;
allgray = allgray && (r == g) && (g == b);
if (hasalpha) {
int alpha = cmaprgb >>> 24;
if (alpha != 0xff) {
if (alpha == 0x00) {
if (transparency == OPAQUE) {
transparency = BITMASK;
}
if (transparent_index < 0) {
transparent_index = i;
}
} else {
transparency = TRANSLUCENT;
}
allgray = false;
}
} else {
cmaprgb |= 0xff000000;
}
rgb[i] = cmaprgb;
}
this.allgrayopaque = allgray;
setTransparency(transparency);
| | private void | setRGBs(int size, byte[] r, byte[] g, byte[] b, byte[] a)
if (size < 1) {
throw new IllegalArgumentException("Map size ("+size+
") must be >= 1");
}
map_size = size;
rgb = new int[calcRealMapSize(pixel_bits, size)];
int alpha = 0xff;
int transparency = OPAQUE;
boolean allgray = true;
for (int i = 0; i < size; i++) {
int rc = r[i] & 0xff;
int gc = g[i] & 0xff;
int bc = b[i] & 0xff;
allgray = allgray && (rc == gc) && (gc == bc);
if (a != null) {
alpha = a[i] & 0xff;
if (alpha != 0xff) {
if (alpha == 0x00) {
if (transparency == OPAQUE) {
transparency = BITMASK;
}
if (transparent_index < 0) {
transparent_index = i;
}
} else {
transparency = TRANSLUCENT;
}
allgray = false;
}
}
rgb[i] = (alpha << 24) | (rc << 16) | (gc << 8) | bc;
}
this.allgrayopaque = allgray;
setTransparency(transparency);
| | private void | setTransparency(int transparency)
if (this.transparency != transparency) {
this.transparency = transparency;
if (transparency == OPAQUE) {
supportsAlpha = false;
numComponents = 3;
nBits = opaqueBits;
} else {
supportsAlpha = true;
numComponents = 4;
nBits = alphaBits;
}
}
| | private void | setTransparentPixel(int trans)
if (trans >= 0 && trans < map_size) {
rgb[trans] &= 0x00ffffff;
transparent_index = trans;
allgrayopaque = false;
if (this.transparency == OPAQUE) {
setTransparency(BITMASK);
}
}
| | public java.lang.String | toString()Returns the String representation of the contents of
this ColorModelobject.
return new String("IndexColorModel: #pixelBits = "+pixel_bits
+ " numComponents = "+numComponents
+ " color space = "+colorSpace
+ " transparency = "+transparency
+ " transIndex = "+transparent_index
+ " has alpha = "+supportsAlpha
+ " isAlphaPre = "+isAlphaPremultiplied
);
|
|
