下面列出了java.awt.image.IndexColorModel#getMapSize() 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
private static synchronized byte[] getDefaultPalette() {
if (defaultPalette == null) {
BufferedImage img = new BufferedImage(1, 1,
BufferedImage.TYPE_BYTE_INDEXED);
IndexColorModel icm = (IndexColorModel) img.getColorModel();
final int size = icm.getMapSize();
byte[] r = new byte[size];
byte[] g = new byte[size];
byte[] b = new byte[size];
icm.getReds(r);
icm.getGreens(g);
icm.getBlues(b);
defaultPalette = new byte[size * 3];
for (int i = 0; i < size; i++) {
defaultPalette[3 * i + 0] = r[i];
defaultPalette[3 * i + 1] = g[i];
defaultPalette[3 * i + 2] = b[i];
}
}
return defaultPalette;
}
private static synchronized byte[] getDefaultPalette() {
if (defaultPalette == null) {
BufferedImage img = new BufferedImage(1, 1,
BufferedImage.TYPE_BYTE_INDEXED);
IndexColorModel icm = (IndexColorModel) img.getColorModel();
final int size = icm.getMapSize();
byte[] r = new byte[size];
byte[] g = new byte[size];
byte[] b = new byte[size];
icm.getReds(r);
icm.getGreens(g);
icm.getBlues(b);
defaultPalette = new byte[size * 3];
for (int i = 0; i < size; i++) {
defaultPalette[3 * i + 0] = r[i];
defaultPalette[3 * i + 1] = g[i];
defaultPalette[3 * i + 2] = b[i];
}
}
return defaultPalette;
}
private static synchronized byte[] getDefaultPalette() {
if (defaultPalette == null) {
BufferedImage img = new BufferedImage(1, 1,
BufferedImage.TYPE_BYTE_INDEXED);
IndexColorModel icm = (IndexColorModel) img.getColorModel();
final int size = icm.getMapSize();
byte[] r = new byte[size];
byte[] g = new byte[size];
byte[] b = new byte[size];
icm.getReds(r);
icm.getGreens(g);
icm.getBlues(b);
defaultPalette = new byte[size * 3];
for (int i = 0; i < size; i++) {
defaultPalette[3 * i + 0] = r[i];
defaultPalette[3 * i + 1] = g[i];
defaultPalette[3 * i + 2] = b[i];
}
}
return defaultPalette;
}
private IIOMetadataNode gethISTNode(BufferedImage bi) {
IndexColorModel icm = (IndexColorModel)bi.getColorModel();
int mapSize = icm.getMapSize();
int[] hist = new int[mapSize];
Arrays.fill(hist, 0);
Raster r = bi.getData();
for (int y = 0; y < bi.getHeight(); y++) {
for (int x = 0; x < bi.getWidth(); x++) {
int s = r.getSample(x, y, 0);
hist[s] ++;
}
}
IIOMetadataNode hIST = new IIOMetadataNode("hIST");
for (int i = 0; i < hist.length; i++) {
IIOMetadataNode n = new IIOMetadataNode("hISTEntry");
n.setAttribute("index", "" + i);
n.setAttribute("value", "" + hist[i]);
hIST.appendChild(n);
}
return hIST;
}
private static synchronized byte[] getDefaultPalette() {
if (defaultPalette == null) {
BufferedImage img = new BufferedImage(1, 1,
BufferedImage.TYPE_BYTE_INDEXED);
IndexColorModel icm = (IndexColorModel) img.getColorModel();
final int size = icm.getMapSize();
byte[] r = new byte[size];
byte[] g = new byte[size];
byte[] b = new byte[size];
icm.getReds(r);
icm.getGreens(g);
icm.getBlues(b);
defaultPalette = new byte[size * 3];
for (int i = 0; i < size; i++) {
defaultPalette[3 * i + 0] = r[i];
defaultPalette[3 * i + 1] = g[i];
defaultPalette[3 * i + 2] = b[i];
}
}
return defaultPalette;
}
private IIOMetadataNode gethISTNode(BufferedImage bi) {
IndexColorModel icm = (IndexColorModel)bi.getColorModel();
int mapSize = icm.getMapSize();
int[] hist = new int[mapSize];
Arrays.fill(hist, 0);
Raster r = bi.getData();
for (int y = 0; y < bi.getHeight(); y++) {
for (int x = 0; x < bi.getWidth(); x++) {
int s = r.getSample(x, y, 0);
hist[s] ++;
}
}
IIOMetadataNode hIST = new IIOMetadataNode("hIST");
for (int i = 0; i < hist.length; i++) {
IIOMetadataNode n = new IIOMetadataNode("hISTEntry");
n.setAttribute("index", "" + i);
n.setAttribute("value", "" + hist[i]);
hIST.appendChild(n);
}
return hIST;
}
JFIFThumbPalette(BufferedImage thumb) throws IllegalThumbException {
super(thumb);
IndexColorModel icm = (IndexColorModel) thumbnail.getColorModel();
if (icm.getMapSize() > 256) {
throw new IllegalThumbException();
}
}
public static boolean isFilterableICM(ColorModel cm) {
if (cm instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel) cm;
if (icm.getMapSize() <= 256) {
return true;
}
}
return false;
}
protected void drawDIBImage(byte[] image,
float destX, float destY,
float destWidth, float destHeight,
float srcX, float srcY,
float srcWidth, float srcHeight,
int sampleBitsPerPixel,
IndexColorModel icm) {
int bitCount = 24;
byte[] bmiColors = null;
if (icm != null) {
bitCount = sampleBitsPerPixel;
bmiColors = new byte[(1<<icm.getPixelSize())*4];
for (int i=0;i<icm.getMapSize(); i++) {
bmiColors[i*4+0]=(byte)(icm.getBlue(i)&0xff);
bmiColors[i*4+1]=(byte)(icm.getGreen(i)&0xff);
bmiColors[i*4+2]=(byte)(icm.getRed(i)&0xff);
}
}
drawDIBImage(getPrintDC(), image,
destX, destY,
destWidth, destHeight,
srcX, srcY,
srcWidth, srcHeight,
bitCount, bmiColors);
}
public static boolean isFilterableICM(ColorModel cm) {
if (cm instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel) cm;
if (icm.getMapSize() <= 256) {
return true;
}
}
return false;
}
public static boolean isFilterableICM(ColorModel cm) {
if (cm instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel) cm;
if (icm.getMapSize() <= 256) {
return true;
}
}
return false;
}
/** Converts an IndexColorModel to a 2D byte array. */
public static byte[][] get8BitLookupTable(final ColorModel model) {
if (!(model instanceof IndexColorModel)) return null;
final IndexColorModel m = (IndexColorModel) model;
final byte[][] lut = new byte[3][m.getMapSize()];
m.getReds(lut[0]);
m.getGreens(lut[1]);
m.getBlues(lut[2]);
return lut;
}
public static boolean isFilterableICM(ColorModel cm) {
if (cm instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel) cm;
if (icm.getMapSize() <= 256) {
return true;
}
}
return false;
}
protected void drawDIBImage(byte[] image,
float destX, float destY,
float destWidth, float destHeight,
float srcX, float srcY,
float srcWidth, float srcHeight,
int sampleBitsPerPixel,
IndexColorModel icm) {
int bitCount = 24;
byte[] bmiColors = null;
if (icm != null) {
bitCount = sampleBitsPerPixel;
bmiColors = new byte[(1<<icm.getPixelSize())*4];
for (int i=0;i<icm.getMapSize(); i++) {
bmiColors[i*4+0]=(byte)(icm.getBlue(i)&0xff);
bmiColors[i*4+1]=(byte)(icm.getGreen(i)&0xff);
bmiColors[i*4+2]=(byte)(icm.getRed(i)&0xff);
}
}
drawDIBImage(getPrintDC(), image,
destX, destY,
destWidth, destHeight,
srcX, srcY,
srcWidth, srcHeight,
bitCount, bmiColors);
}
/**
* Create a color table from the image ColorModel and SampleModel.
*/
private static byte[] createColorTable(ColorModel colorModel,
SampleModel sampleModel)
{
byte[] colorTable;
if (colorModel instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel)colorModel;
int mapSize = icm.getMapSize();
/**
* The GIF image format assumes that size of image palette
* is power of two. We will use closest larger power of two
* as size of color table.
*/
int ctSize = getGifPaletteSize(mapSize);
byte[] reds = new byte[ctSize];
byte[] greens = new byte[ctSize];
byte[] blues = new byte[ctSize];
icm.getReds(reds);
icm.getGreens(greens);
icm.getBlues(blues);
/**
* fill tail of color component arrays by replica of first color
* in order to avoid appearance of extra colors in the color table
*/
for (int i = mapSize; i < ctSize; i++) {
reds[i] = reds[0];
greens[i] = greens[0];
blues[i] = blues[0];
}
colorTable = new byte[3*ctSize];
int idx = 0;
for (int i = 0; i < ctSize; i++) {
colorTable[idx++] = reds[i];
colorTable[idx++] = greens[i];
colorTable[idx++] = blues[i];
}
} else if (sampleModel.getNumBands() == 1) {
// create gray-scaled color table for single-banded images
int numBits = sampleModel.getSampleSize()[0];
if (numBits > 8) {
numBits = 8;
}
int colorTableLength = 3*(1 << numBits);
colorTable = new byte[colorTableLength];
for (int i = 0; i < colorTableLength; i++) {
colorTable[i] = (byte)(i/3);
}
} else {
// We do not have enough information here
// to create well-fit color table for RGB image.
colorTable = null;
}
return colorTable;
}
/**
* Create a color table from the image ColorModel and SampleModel.
*/
private static byte[] createColorTable(ColorModel colorModel,
SampleModel sampleModel)
{
byte[] colorTable;
if (colorModel instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel)colorModel;
int mapSize = icm.getMapSize();
/**
* The GIF image format assumes that size of image palette
* is power of two. We will use closest larger power of two
* as size of color table.
*/
int ctSize = getGifPaletteSize(mapSize);
byte[] reds = new byte[ctSize];
byte[] greens = new byte[ctSize];
byte[] blues = new byte[ctSize];
icm.getReds(reds);
icm.getGreens(greens);
icm.getBlues(blues);
/**
* fill tail of color component arrays by replica of first color
* in order to avoid appearance of extra colors in the color table
*/
for (int i = mapSize; i < ctSize; i++) {
reds[i] = reds[0];
greens[i] = greens[0];
blues[i] = blues[0];
}
colorTable = new byte[3*ctSize];
int idx = 0;
for (int i = 0; i < ctSize; i++) {
colorTable[idx++] = reds[i];
colorTable[idx++] = greens[i];
colorTable[idx++] = blues[i];
}
} else if (sampleModel.getNumBands() == 1) {
// create gray-scaled color table for single-banded images
int numBits = sampleModel.getSampleSize()[0];
if (numBits > 8) {
numBits = 8;
}
int colorTableLength = 3*(1 << numBits);
colorTable = new byte[colorTableLength];
for (int i = 0; i < colorTableLength; i++) {
colorTable[i] = (byte)(i/3);
}
} else {
// We do not have enough information here
// to create well-fit color table for RGB image.
colorTable = null;
}
return colorTable;
}
/**
* Create a color table from the image ColorModel and SampleModel.
*/
private static byte[] createColorTable(ColorModel colorModel,
SampleModel sampleModel)
{
byte[] colorTable;
if (colorModel instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel)colorModel;
int mapSize = icm.getMapSize();
/**
* The GIF image format assumes that size of image palette
* is power of two. We will use closest larger power of two
* as size of color table.
*/
int ctSize = getGifPaletteSize(mapSize);
byte[] reds = new byte[ctSize];
byte[] greens = new byte[ctSize];
byte[] blues = new byte[ctSize];
icm.getReds(reds);
icm.getGreens(greens);
icm.getBlues(blues);
/**
* fill tail of color component arrays by replica of first color
* in order to avoid appearance of extra colors in the color table
*/
for (int i = mapSize; i < ctSize; i++) {
reds[i] = reds[0];
greens[i] = greens[0];
blues[i] = blues[0];
}
colorTable = new byte[3*ctSize];
int idx = 0;
for (int i = 0; i < ctSize; i++) {
colorTable[idx++] = reds[i];
colorTable[idx++] = greens[i];
colorTable[idx++] = blues[i];
}
} else if (sampleModel.getNumBands() == 1) {
// create gray-scaled color table for single-banded images
int numBits = sampleModel.getSampleSize()[0];
if (numBits > 8) {
numBits = 8;
}
int colorTableLength = 3*(1 << numBits);
colorTable = new byte[colorTableLength];
for (int i = 0; i < colorTableLength; i++) {
colorTable[i] = (byte)(i/3);
}
} else {
// We do not have enough information here
// to create well-fit color table for RGB image.
colorTable = null;
}
return colorTable;
}
public void setColorModel(ColorModel model) {
if (src != null) {
src.checkSecurity(null, false);
}
srcModel = model;
// Check to see if model is INT_RGB
if (model instanceof IndexColorModel) {
if (model.getTransparency() == model.TRANSLUCENT) {
// REMIND:
// Probably need to composite anyway so force ARGB
cmodel = ColorModel.getRGBdefault();
srcLUT = null;
}
else {
IndexColorModel icm = (IndexColorModel) model;
numSrcLUT = icm.getMapSize();
srcLUT = new int[Math.max(numSrcLUT, 256)];
icm.getRGBs(srcLUT);
srcLUTtransIndex = icm.getTransparentPixel();
cmodel = model;
}
}
else {
if (cmodel == null) {
cmodel = model;
srcLUT = null;
}
else if (model instanceof DirectColorModel) {
// If it is INT_RGB or INT_ARGB, use the model
DirectColorModel dcm = (DirectColorModel) model;
if ((dcm.getRedMask() == 0xff0000) &&
(dcm.getGreenMask() == 0xff00) &&
(dcm.getBlueMask() == 0x00ff)) {
cmodel = model;
srcLUT = null;
}
}
}
isSameCM = (cmodel == model);
}
public void setColorModel(ColorModel model) {
if (src != null) {
src.checkSecurity(null, false);
}
srcModel = model;
// Check to see if model is INT_RGB
if (model instanceof IndexColorModel) {
if (model.getTransparency() == model.TRANSLUCENT) {
// REMIND:
// Probably need to composite anyway so force ARGB
cmodel = ColorModel.getRGBdefault();
srcLUT = null;
}
else {
IndexColorModel icm = (IndexColorModel) model;
numSrcLUT = icm.getMapSize();
srcLUT = new int[Math.max(numSrcLUT, 256)];
icm.getRGBs(srcLUT);
srcLUTtransIndex = icm.getTransparentPixel();
cmodel = model;
}
}
else {
if (cmodel == null) {
cmodel = model;
srcLUT = null;
}
else if (model instanceof DirectColorModel) {
// If it is INT_RGB or INT_ARGB, use the model
DirectColorModel dcm = (DirectColorModel) model;
if ((dcm.getRedMask() == 0xff0000) &&
(dcm.getGreenMask() == 0xff00) &&
(dcm.getBlueMask() == 0x00ff)) {
cmodel = model;
srcLUT = null;
}
}
}
isSameCM = (cmodel == model);
}
@Override
public void writeImage(OutputStream out, BufferedImage image,
int frameDurationInCentiseconds, IndexColorModel globalColorModel,
boolean writeLocalColorTable) throws IOException {
if (frameDurationInCentiseconds >= 0
|| globalColorModel.getTransparentPixel() != -1) {
if (frameDurationInCentiseconds < 0)
frameDurationInCentiseconds = 0;
GifGraphicControlExtension gce = new GifGraphicControlExtension(
frameDurationInCentiseconds,
DisposalMethod.RESTORE_BACKGROUND,
globalColorModel.getTransparentPixel());
gce.write(out);
}
int localColorSize = 0;
if (writeLocalColorTable) {
localColorSize = globalColorModel.getMapSize();
int k = 2;
while (localColorSize > k) {
k *= 2;
}
if (k > 256)
throw new IllegalArgumentException("Illegal number of colors ("
+ localColorSize + "). There can only be 256 at most.");
localColorSize = k;
}
Dimension d = new Dimension(image.getWidth(), image.getHeight());
GifImageDescriptor id = new GifImageDescriptor(0, 0, d.width, d.height,
false, localColorSize);
id.write(out);
if (localColorSize > 0) {
GifLocalColorTable ct = new GifLocalColorTable(globalColorModel);
ct.write(out);
}
GifImageDataBlock dataBlock = new GifImageDataBlock(image,
globalColorModel);
dataBlock.write(out);
}