JDK8/Java8源码在线阅读
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package java.awt.image;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.math.BigInteger;
/**
* The <code>IndexColorModel</code> class is a <code>ColorModel</code>
* 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 <code>BigInteger</code> object.
* This color model is similar to an X11 PseudoColor visual.
* <p>
* 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
* <code>IndexColorModel</code> objects are never pre-multiplied with
* the alpha components.
* <p>
* <a name="transparency">
* The transparency of an <code>IndexColorModel</code> 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 <code>Transparency.OPAQUE</code>
* 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 <code>Transparency.BITMASK</code>.
* Otherwise, the value is <code>Transparency.TRANSLUCENT</code>, indicating
* that some valid color has an alpha component that is
* neither completely transparent nor completely opaque
* (0.0 < alpha < 1.0).
* </a>
*
* <p>
* If an <code>IndexColorModel</code> object has
* a transparency value of <code>Transparency.OPAQUE</code>,
* then the <code>hasAlpha</code>
* and <code>getNumComponents</code> methods
* (both inherited from <code>ColorModel</code>)
* return false and 3, respectively.
* For any other transparency value,
* <code>hasAlpha</code> returns true
* and <code>getNumComponents</code> returns 4.
*
* <p>
* <a name="index_values">
* The values used to index into the colormap are taken from the least
* significant <em>n</em> bits of pixel representations where
* <em>n</em> is based on the pixel size specified in the constructor.
* For pixel sizes smaller than 8 bits, <em>n</em> 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, <em>n</em> is equal to the
* pixel size.
* Pixel sizes larger than 16 bits are not supported by this class.
* Higher order bits beyond <em>n</em> are ignored in pixel representations.
* Index values greater than or equal to the map size, but less than
* 2<sup><em>n</em></sup>, are undefined and return 0 for all color and
* alpha components.
* </a>
* <p>
* For those methods that use a primitive array pixel representation of
* type <code>transferType</code>, the array length is always one.
* The transfer types supported are <code>DataBuffer.TYPE_BYTE</code> and
* <code>DataBuffer.TYPE_USHORT</code>. 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 <code>IllegalArgumentException</code> due to an invalid
* pixel value.
* <p>
* 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.
*
* @see ColorModel
* @see ColorSpace
* @see DataBuffer
*
*/
public class IndexColorModel extends ColorModel {
private int rgb[];
private int map_size;
private int pixel_mask;
private int transparent_index = -1;
private boolean allgrayopaque;
private BigInteger validBits;
private sun.awt.image.BufImgSurfaceData.ICMColorData colorData = null;
private static int[] opaqueBits = {8, 8, 8};
private static int[] alphaBits = {8, 8, 8, 8};
static private native void initIDs();
static {
ColorModel.loadLibraries();
initIDs();
}
/**
* Constructs an <code>IndexColorModel</code> 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 <code>ColorSpace</code> is the default sRGB space.
* Since there is no alpha information in any of the arguments
* to this constructor, the transparency value is always
* <code>Transparency.OPAQUE</code>.
* The transfer type is the smallest of <code>DataBuffer.TYPE_BYTE</code>
* or <code>DataBuffer.TYPE_USHORT</code> that can hold a single pixel.
* @param bits the number of bits each pixel occupies
* @param size the size of the color component arrays
* @param r the array of red color components
* @param g the array of green color components
* @param b the array of blue color components
* @throws IllegalArgumentException if <code>bits</code> is less
* than 1 or greater than 16
* @throws IllegalArgumentException if <code>size</code> is less
* than 1
*/
public IndexColorModel(int bits, int size,
byte r[], byte g[], byte b[]) {
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();
}
/**
* Constructs an <code>IndexColorModel</code> 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 <code>ColorSpace</code> is the default sRGB space.
* The transparency value may be <code>Transparency.OPAQUE</code> or
* <code>Transparency.BITMASK</code> depending on the arguments, as
* specified in the <a href="#transparency">class description</a> above.
* The transfer type is the smallest of <code>DataBuffer.TYPE_BYTE</code>
* or <code>DataBuffer.TYPE_USHORT</code> that can hold a
* single pixel.
* @param bits the number of bits each pixel occupies
* @param size the size of the color component arrays
* @param r the array of red color components
* @param g the array of green color components
* @param b the array of blue color components
* @param trans the index of the transparent pixel
* @throws IllegalArgumentException if <code>bits</code> is less than
* 1 or greater than 16
* @throws IllegalArgumentException if <code>size</code> is less than
* 1
*/
public IndexColorModel(int bits, int size,
byte r[], byte g[], byte b[], int trans) {
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();
}
/**
* Constructs an <code>IndexColorModel</code> 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 <code>ColorSpace</code> is the default sRGB space.
* The transparency value may be any of <code>Transparency.OPAQUE</code>,
* <code>Transparency.BITMASK</code>,
* or <code>Transparency.TRANSLUCENT</code>
* depending on the arguments, as specified
* in the <a href="#transparency">class description</a> above.
* The transfer type is the smallest of <code>DataBuffer.TYPE_BYTE</code>
* or <code>DataBuffer.TYPE_USHORT</code> that can hold a single pixel.
* @param bits the number of bits each pixel occupies
* @param size the size of the color component arrays
* @param r the array of red color components
* @param g the array of green color components
* @param b the array of blue color components
* @param a the array of alpha value components
* @throws IllegalArgumentException if <code>bits</code> is less
* than 1 or greater than 16
* @throws IllegalArgumentException if <code>size</code> is less
* than 1
*/
public IndexColorModel(int bits, int size,
byte r[], byte g[], byte b[], byte a[]) {
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();
}
/**
* Constructs an <code>IndexColorModel</code> 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 <code>ColorSpace</code> is the default sRGB space.
* The transparency value may be any of <code>Transparency.OPAQUE</code>,
* <code>Transparency.BITMASK</code>,
* or <code>Transparency.TRANSLUCENT</code>
* depending on the arguments, as specified
* in the <a href="#transparency">class description</a> above.
* The transfer type is the smallest of
* <code>DataBuffer.TYPE_BYTE</code> or <code>DataBuffer.TYPE_USHORT</code>
* that can hold a single pixel.
*
* @param bits the number of bits each pixel occupies
* @param size the size of the color component arrays
* @param cmap the array of color components
* @param start the starting offset of the first color component
* @param hasalpha indicates whether alpha values are contained in
* the <code>cmap</code> array
* @throws IllegalArgumentException if <code>bits</code> is less
* than 1 or greater than 16
* @throws IllegalArgumentException if <code>size</code> is less
* than 1
*/
public IndexColorModel(int bits, int size, byte cmap[], int start,
boolean hasalpha) {
this(bits, size, cmap, start, hasalpha, -1);
if (bits < 1 || bits > 16) {
throw new IllegalArgumentException("Number of bits must be between"
+" 1 and 16.");
}
}
/**
* Constructs an <code>IndexColorModel</code> 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 <code>ColorSpace</code> is the default sRGB space.
* The transparency value may be any of <code>Transparency.OPAQUE</code>,
* <code>Transparency.BITMASK</code>,
* or <code>Transparency.TRANSLUCENT</code>
* depending on the arguments, as specified
* in the <a href="#transparency">class description</a> above.
* The transfer type is the smallest of
* <code>DataBuffer.TYPE_BYTE</code> or <code>DataBuffer.TYPE_USHORT</code>
* that can hold a single pixel.
* @param bits the number of bits each pixel occupies
* @param size the size of the color component arrays
* @param cmap the array of color components
* @param start the starting offset of the first color component
* @param hasalpha indicates whether alpha values are contained in
* the <code>cmap</code> array
* @param trans the index of the fully transparent pixel
* @throws IllegalArgumentException if <code>bits</code> is less than
* 1 or greater than 16
* @throws IllegalArgumentException if <code>size</code> is less than
* 1
*/
public IndexColorModel(int bits, int size, byte cmap[], int start,
boolean hasalpha, int trans) {
// 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();
}
/**
* Constructs an <code>IndexColorModel</code> 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 <code>ColorSpace</code> is the default sRGB space.
* The transparency value may be any of <code>Transparency.OPAQUE</code>,
* <code>Transparency.BITMASK</code>,
* or <code>Transparency.TRANSLUCENT</code>
* depending on the arguments, as specified
* in the <a href="#transparency">class description</a> above.
* @param bits the number of bits each pixel occupies
* @param size the size of the color component arrays
* @param cmap the array of color components
* @param start the starting offset of the first color component
* @param hasalpha indicates whether alpha values are contained in
* the <code>cmap</code> array
* @param trans the index of the fully transparent pixel
* @param transferType the data type of the array used to represent
* pixel values. The data type must be either
* <code>DataBuffer.TYPE_BYTE</code> or
* <code>DataBuffer.TYPE_USHORT</code>.
* @throws IllegalArgumentException if <code>bits</code> is less
* than 1 or greater than 16
* @throws IllegalArgumentException if <code>size</code> is less
* than 1
* @throws IllegalArgumentException if <code>transferType</code> is not
* one of <code>DataBuffer.TYPE_BYTE</code> or
* <code>DataBuffer.TYPE_USHORT</code>
*/
public IndexColorModel(int bits, int size,
int cmap[], int start,
boolean hasalpha, int trans, int transferType) {
// 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();
}
/**
* Constructs an <code>IndexColorModel</code> from an
* <code>int</code> array where each <code>int</code> 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 <code>ColorSpace</code> is the default sRGB space.
* The transparency value may be any of <code>Transparency.OPAQUE</code>,
* <code>Transparency.BITMASK</code>,
* or <code>Transparency.TRANSLUCENT</code>
* depending on the arguments, as specified
* in the <a href="#transparency">class description</a> above.
* The transfer type must be one of <code>DataBuffer.TYPE_BYTE</code>
* <code>DataBuffer.TYPE_USHORT</code>.
* The <code>BigInteger</code> object specifies the valid/invalid pixels
* in the <code>cmap</code> array. A pixel is valid if the
* <code>BigInteger</code> value at that index is set, and is invalid
* if the <code>BigInteger</code> bit at that index is not set.
* @param bits the number of bits each pixel occupies
* @param size the size of the color component array
* @param cmap the array of color components
* @param start the starting offset of the first color component
* @param transferType the specified data type
* @param validBits a <code>BigInteger</code> object. If a bit is
* set in the BigInteger, the pixel at that index is valid.
* If a bit is not set, the pixel at that index
* is considered invalid. If null, all pixels are valid.
* Only bits from 0 to the map size are considered.
* @throws IllegalArgumentException if <code>bits</code> is less
* than 1 or greater than 16
* @throws IllegalArgumentException if <code>size</code> is less
* than 1
* @throws IllegalArgumentException if <code>transferType</code> is not
* one of <code>DataBuffer.TYPE_BYTE</code> or
* <code>DataBuffer.TYPE_USHORT</code>
*
* @since 1.3
*/
public IndexColorModel(int bits, int size, int cmap[], int start,
int transferType, BigInteger validBits) {
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();
}
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 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 int calcRealMapSize(int bits, int size) {
int newSize = Math.max(1 << bits, size);
return Math.max(newSize, 256);
}
private 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);
}
/**
* Returns the transparency. Returns either OPAQUE, BITMASK,
* or TRANSLUCENT
* @return the transparency of this <code>IndexColorModel</code>
* @see Transparency#OPAQUE
* @see Transparency#BITMASK
* @see Transparency#TRANSLUCENT
*/
public int getTransparency() {
return transparency;
}
/**
* 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.
* @return an array containing the number of bits of each color
* and alpha component of this <code>IndexColorModel</code>
*/
public int[] getComponentSize() {
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.clone();
}
/**
* Returns the size of the color/alpha component arrays in this
* <code>IndexColorModel</code>.
* @return the size of the color and alpha component arrays.
*/
final public int getMapSize() {
return map_size;
}
/**
* Returns the index of a transparent pixel in this
* <code>IndexColorModel</code> 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 the index of a transparent pixel in this
* <code>IndexColorModel</code> object, or -1 if there
* is no such pixel
*/
final public int getTransparentPixel() {
return transparent_index;
}
/**
* 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.
* @param r the specified array into which the elements of the
* array of red color components are copied
*/
final public void getReds(byte r[]) {
for (int i = 0; i < map_size; i++) {
r[i] = (byte) (rgb[i] >> 16);
}
}
/**
* Copies the array of green color components into the specified array.
* Only the initial entries of the array as specified by
* <code>getMapSize</code> are written.
* @param g the specified array into which the elements of the
* array of green color components are copied
*/
final public void getGreens(byte g[]) {
for (int i = 0; i < map_size; i++) {
g[i] = (byte) (rgb[i] >> 8);
}
}
/**
* Copies the array of blue color components into the specified array.
* Only the initial entries of the array as specified by
* <code>getMapSize</code> are written.
* @param b the specified array into which the elements of the
* array of blue color components are copied
*/
final public void getBlues(byte b[]) {
for (int i = 0; i < map_size; i++) {
b[i] = (byte) rgb[i];
}
}
/**
* Copies the array of alpha transparency components into the
* specified array. Only the initial entries of the array as specified
* by <code>getMapSize</code> are written.
* @param a the specified array into which the elements of the
* array of alpha components are copied
*/
final public void getAlphas(byte a[]) {
for (int i = 0; i < map_size; i++) {
a[i] = (byte) (rgb[i] >> 24);
}
}
/**
* 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
* <code>getMapSize</code> are
* written.
* @param rgb the specified array into which the converted ARGB
* values from this array of color and alpha components
* are copied.
*/
final public void getRGBs(int rgb[]) {
System.arraycopy(this.rgb, 0, rgb, 0, map_size);
}
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);
}
}
}
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;
}
}
}
/**
* 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().
*/
private final void calculatePixelMask() {
// 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;
}
/**
* 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 <em>n</em> bits of the pixel value, as specified in the
* <a href="#index_values">class description</a> above, are used to
* calculate the returned value.
* The returned value is a non pre-multiplied value.
* @param pixel the specified pixel
* @return the value of the red color component for the specified pixel
*/
final public int getRed(int pixel) {
return (rgb[pixel & pixel_mask] >> 16) & 0xff;
}
/**
* 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 <em>n</em> bits of the pixel value, as specified in the
* <a href="#index_values">class description</a> above, are used to
* calculate the returned value.
* The returned value is a non pre-multiplied value.
* @param pixel the specified pixel
* @return the value of the green color component for the specified pixel
*/
final public int getGreen(int pixel) {
return (rgb[pixel & pixel_mask] >> 8) & 0xff;
}
/**
* 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 <em>n</em> bits of the pixel value, as specified in the
* <a href="#index_values">class description</a> above, are used to
* calculate the returned value.
* The returned value is a non pre-multiplied value.
* @param pixel the specified pixel
* @return the value of the blue color component for the specified pixel
*/
final public int getBlue(int pixel) {
return rgb[pixel & pixel_mask] & 0xff;
}
/**
* Returns the alpha component for the specified pixel, scaled
* from 0 to 255. The pixel value is specified as an int.
* Only the lower <em>n</em> bits of the pixel value, as specified in the
* <a href="#index_values">class description</a> above, are used to
* calculate the returned value.
* @param pixel the specified pixel
* @return the value of the alpha component for the specified pixel
*/
final public int getAlpha(int pixel) {
return (rgb[pixel & pixel_mask] >> 24) & 0xff;
}
/**
* 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 <em>n</em> bits of the pixel value, as specified in the
* <a href="#index_values">class description</a> above, are used to
* calculate the returned value.
* The returned value is in a non pre-multiplied format.
* @param pixel the specified pixel
* @return the color and alpha components of the specified pixel
* @see ColorModel#getRGBdefault
*/
final public int getRGB(int pixel) {
return rgb[pixel & pixel_mask];
}
private static final int CACHESIZE = 40;
private int lookupcache[] = new int[CACHESIZE];
/**
* 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
* <code>null</code>, a new array is allocated. If <code>pixel</code>
* is not <code>null</code>, it must be
* a primitive array of type <code>transferType</code>; otherwise, a
* <code>ClassCastException</code> is thrown. An
* <code>ArrayIndexOutOfBoundsException</code> is
* thrown if <code>pixel</code> is not large enough to hold a pixel
* value for this <code>ColorModel</code>. The pixel array is returned.
* <p>
* Since <code>IndexColorModel</code> 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 <code>transferType</code>.
*
* @param rgb the integer pixel representation in the default RGB
* color model
* @param pixel the specified pixel
* @return an array representation of the specified pixel in this
* <code>IndexColorModel</code>.
* @throws ClassCastException if <code>pixel</code>
* is not a primitive array of type <code>transferType</code>
* @throws ArrayIndexOutOfBoundsException if
* <code>pixel</code> is not large enough to hold a pixel value
* for this <code>ColorModel</code>
* @throws UnsupportedOperationException if <code>transferType</code>
* is invalid
* @see WritableRaster#setDataElements
* @see SampleModel#setDataElements
*/
public synchronized Object getDataElements(int rgb, Object pixel) {
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);
}
private Object installpixel(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;
}
/**
* Returns an array of unnormalized color/alpha components for a
* specified pixel in this <code>ColorModel</code>. The pixel value
* is specified as an int. If the <code>components</code> array is <code>null</code>,
* a new array is allocated that contains
* <code>offset + getNumComponents()</code> elements.
* The <code>components</code> array is returned,
* with the alpha component included
* only if <code>hasAlpha</code> returns true.
* Color/alpha components are stored in the <code>components</code> array starting
* at <code>offset</code> even if the array is allocated by this method.
* An <code>ArrayIndexOutOfBoundsException</code>
* is thrown if the <code>components</code> array is not <code>null</code> and is
* not large enough to hold all the color and alpha components
* starting at <code>offset</code>.
* @param pixel the specified pixel
* @param components the array to receive the color and alpha
* components of the specified pixel
* @param offset the offset into the <code>components</code> array at
* which to start storing the color and alpha components
* @return an array containing the color and alpha components of the
* specified pixel starting at the specified offset.
* @see ColorModel#hasAlpha
* @see ColorModel#getNumComponents
*/
public int[] getComponents(int pixel, int[] components, int 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;
}
/**
* Returns an array of unnormalized color/alpha components for
* a specified pixel in this <code>ColorModel</code>. The pixel
* value is specified by an array of data elements of type
* <code>transferType</code> passed in as an object reference.
* If <code>pixel</code> is not a primitive array of type
* <code>transferType</code>, a <code>ClassCastException</code>
* is thrown. An <code>ArrayIndexOutOfBoundsException</code>
* is thrown if <code>pixel</code> is not large enough to hold
* a pixel value for this <code>ColorModel</code>. If the
* <code>components</code> array is <code>null</code>, a new array
* is allocated that contains
* <code>offset + getNumComponents()</code> elements.
* The <code>components</code> array is returned,
* with the alpha component included
* only if <code>hasAlpha</code> returns true.
* Color/alpha components are stored in the <code>components</code>
* array starting at <code>offset</code> even if the array is
* allocated by this method. An
* <code>ArrayIndexOutOfBoundsException</code> is also
* thrown if the <code>components</code> array is not
* <code>null</code> and is not large enough to hold all the color
* and alpha components starting at <code>offset</code>.
* <p>
* Since <code>IndexColorModel</code> 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 <code>transferType</code>.
*
* @param pixel the specified pixel
* @param components an array that receives the color and alpha
* components of the specified pixel
* @param offset the index into the <code>components</code> array at
* which to begin storing the color and alpha components of the
* specified pixel
* @return an array containing the color and alpha components of the
* specified pixel starting at the specified offset.
* @throws ArrayIndexOutOfBoundsException if <code>pixel</code>
* is not large enough to hold a pixel value for this
* <code>ColorModel</code> or if the
* <code>components</code> array is not <code>null</code>
* and is not large enough to hold all the color
* and alpha components starting at <code>offset</code>
* @throws ClassCastException if <code>pixel</code> is not a
* primitive array of type <code>transferType</code>
* @throws UnsupportedOperationException if <code>transferType</code>
* is not one of the supported transfer types
* @see ColorModel#hasAlpha
* @see ColorModel#getNumComponents
*/
public int[] getComponents(Object pixel, int[] components, int offset) {
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);
}
/**
* Returns a pixel value represented as an int in this
* <code>ColorModel</code> given an array of unnormalized
* color/alpha components. An
* <code>ArrayIndexOutOfBoundsException</code>
* is thrown if the <code>components</code> array is not large
* enough to hold all of the color and alpha components starting
* at <code>offset</code>. Since
* <code>ColorModel</code> 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.
* @param components an array of unnormalized color and alpha
* components
* @param offset the index into <code>components</code> at which to
* begin retrieving the color and alpha components
* @return an <code>int</code> pixel value in this
* <code>ColorModel</code> corresponding to the specified components.
* @throws ArrayIndexOutOfBoundsException if
* the <code>components</code> array is not large enough to
* hold all of the color and alpha components starting at
* <code>offset</code>
* @throws UnsupportedOperationException if <code>transferType</code>
* is invalid
*/
public int getDataElement(int[] components, int offset) {
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;
}
/**
* Returns a data element array representation of a pixel in this
* <code>ColorModel</code> given an array of unnormalized color/alpha
* components. This array can then be passed to the
* <code>setDataElements</code> method of a <code>WritableRaster</code>
* object. An <code>ArrayIndexOutOfBoundsException</code> is
* thrown if the
* <code>components</code> array is not large enough to hold all of the
* color and alpha components starting at <code>offset</code>.
* If the pixel variable is <code>null</code>, a new array
* is allocated. If <code>pixel</code> is not <code>null</code>,
* it must be a primitive array of type <code>transferType</code>;
* otherwise, a <code>ClassCastException</code> is thrown.
* An <code>ArrayIndexOutOfBoundsException</code> is thrown if pixel
* is not large enough to hold a pixel value for this
* <code>ColorModel</code>.
* <p>
* Since <code>IndexColorModel</code> 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 <code>transferType</code>
*
* @param components an array of unnormalized color and alpha
* components
* @param offset the index into <code>components</code> at which to
* begin retrieving color and alpha components
* @param pixel the <code>Object</code> representing an array of color
* and alpha components
* @return an <code>Object</code> representing an array of color and
* alpha components.
* @throws ClassCastException if <code>pixel</code>
* is not a primitive array of type <code>transferType</code>
* @throws ArrayIndexOutOfBoundsException if
* <code>pixel</code> is not large enough to hold a pixel value
* for this <code>ColorModel</code> or the <code>components</code>
* array is not large enough to hold all of the color and alpha
* components starting at <code>offset</code>
* @throws UnsupportedOperationException if <code>transferType</code>
* is not one of the supported transfer types
* @see WritableRaster#setDataElements
* @see SampleModel#setDataElements
*/
public Object getDataElements(int[] components, int offset, Object pixel) {
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);
}
/**
* Creates a <code>WritableRaster</code> with the specified width
* and height that has a data layout (<code>SampleModel</code>)
* compatible with this <code>ColorModel</code>. This method
* only works for color models with 16 or fewer bits per pixel.
* <p>
* Since <code>IndexColorModel</code> can be subclassed, any
* subclass that supports greater than 16 bits per pixel must
* override this method.
*
* @param w the width to apply to the new <code>WritableRaster</code>
* @param h the height to apply to the new <code>WritableRaster</code>
* @return a <code>WritableRaster</code> object with the specified
* width and height.
* @throws UnsupportedOperationException if the number of bits in a
* pixel is greater than 16
* @see WritableRaster
* @see SampleModel
*/
public WritableRaster createCompatibleWritableRaster(int w, int h) {
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;
}
/**
* Returns <code>true</code> if <code>raster</code> is compatible
* with this <code>ColorModel</code> or <code>false</code> if it
* is not compatible with this <code>ColorModel</code>.
* @param raster the {@link Raster} object to test for compatibility
* @return <code>true</code> if <code>raster</code> is compatible
* with this <code>ColorModel</code>; <code>false</code> otherwise.
*
*/
public boolean isCompatibleRaster(Raster raster) {
int size = raster.getSampleModel().getSampleSize(0);
return ((raster.getTransferType() == transferType) &&
(raster.getNumBands() == 1) && ((1 << size) >= map_size));
}
/**
* Creates a <code>SampleModel</code> with the specified
* width and height that has a data layout compatible with
* this <code>ColorModel</code>.
* @param w the width to apply to the new <code>SampleModel</code>
* @param h the height to apply to the new <code>SampleModel</code>
* @return a <code>SampleModel</code> object with the specified
* width and height.
* @throws IllegalArgumentException if <code>w</code> or
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