/* this is changed
public void run() {
*/
public void produceImage() throws IOException, ImageFormatException {
/* this is not needed
ImageConsumer t = target;
if(t!=null) try {
*/
try {
for (int i = 0; i < signature.length; i++)
if ((signature[i] & 0xFF) != underlyingInputStream.read())
throw new PNGException("Chunk signature mismatch");
InputStream is =
new BufferedInputStream(new InflaterInputStream(inputStream, new Inflater()));
getData();
byte[] bPixels = null;
int[] wPixels = null;
int pixSize = width;
int rowStride;
int logDepth = 0;
switch (bitDepth) {
case 1:
logDepth = 0;
break;
case 2:
logDepth = 1;
break;
case 4:
logDepth = 2;
break;
case 8:
logDepth = 3;
break;
case 16:
logDepth = 4;
break;
default:
throw new PNGException("invalid depth");
}
if (interlaceMethod != 0) {
pixSize *= height;
rowStride = width;
} else rowStride = 0;
int combinedType = colorType | (bitDepth << 3);
int bitMask = (1 << (bitDepth >= 8 ? 8 : bitDepth)) - 1;
// Figure out the color model
switch (colorType) {
case COLOR | PALETTE:
case COLOR | PALETTE | ALPHA:
if (red_map == null) throw new PNGException("palette expected");
if (alpha_map == null)
cm = new IndexColorModel(bitDepth, red_map.length, red_map, green_map, blue_map);
else
cm =
new IndexColorModel(
bitDepth, red_map.length, red_map, green_map, blue_map, alpha_map);
bPixels = new byte[pixSize];
break;
case GRAY:
{
int llog = logDepth >= 4 ? 3 : logDepth;
if ((cm = greyModels[llog]) == null) {
int size = 1 << (1 << llog);
byte ramp[] = new byte[size];
for (int i = 0; i < size; i++) ramp[i] = (byte) (255 * i / (size - 1));
if (transparentPixel == -1) {
cm = new IndexColorModel(bitDepth, ramp.length, ramp, ramp, ramp);
} else {
cm =
new IndexColorModel(
bitDepth, ramp.length, ramp, ramp, ramp, (transparentPixel & 0xFF));
}
greyModels[llog] = cm;
}
}
bPixels = new byte[pixSize];
break;
case COLOR:
case COLOR | ALPHA:
case GRAY | ALPHA:
cm = ColorModel.getRGBdefault();
wPixels = new int[pixSize];
break;
default:
throw new PNGException("invalid color type");
}
/* this is going to be set in the pixel store
t.setColorModel(cm);
t.setHints(interlaceMethod !=0
? ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES
: ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES |
ImageConsumer.SINGLEPASS | ImageConsumer.SINGLEFRAME);
*/
// code added to make it work with ImageDecoder architecture
setDimensions(width, height);
setColorModel(cm);
int flags =
(interlaceMethod != 0
? ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES
: ImageConsumer.TOPDOWNLEFTRIGHT
| ImageConsumer.COMPLETESCANLINES
| ImageConsumer.SINGLEPASS
| ImageConsumer.SINGLEFRAME);
setHints(flags);
headerComplete();
// end of adding
int samplesPerPixel =
((colorType & PALETTE) != 0
? 1
: ((colorType & COLOR) != 0 ? 3 : 1) + ((colorType & ALPHA) != 0 ? 1 : 0));
int bitsPerPixel = samplesPerPixel * bitDepth;
int bytesPerPixel = (bitsPerPixel + 7) >> 3;
int pass, passLimit;
if (interlaceMethod == 0) {
pass = -1;
passLimit = 0;
} else {
pass = 0;
passLimit = 7;
}
// These loops are far from being tuned. They're this way to make them easy to
// debug. Tuning comes later.
/* code changed. target not needed here
while(++pass<=passLimit && (t=target)!=null) {
*/
while (++pass <= passLimit) {
int row = startingRow[pass];
int rowInc = rowIncrement[pass];
int colInc = colIncrement[pass];
int bWidth = blockWidth[pass];
int bHeight = blockHeight[pass];
int sCol = startingCol[pass];
int rowPixelWidth = (width - sCol + (colInc - 1)) / colInc;
int rowByteWidth = ((rowPixelWidth * bitsPerPixel) + 7) >> 3;
if (rowByteWidth == 0) continue;
int pixelBufferInc = interlaceMethod == 0 ? rowInc * width : 0;
int rowOffset = rowStride * row;
boolean firstRow = true;
byte[] rowByteBuffer = new byte[rowByteWidth];
byte[] prevRowByteBuffer = new byte[rowByteWidth];
/* code changed. target not needed here
while (row < height && (t=target)!=null) {
*/
while (row < height) {
int rowFilter = is.read();
for (int rowFillPos = 0; rowFillPos < rowByteWidth; ) {
int n = is.read(rowByteBuffer, rowFillPos, rowByteWidth - rowFillPos);
if (n <= 0) throw new PNGException("missing data");
rowFillPos += n;
}
filterRow(
rowByteBuffer,
firstRow ? null : prevRowByteBuffer,
rowFilter,
rowByteWidth,
bytesPerPixel);
int col = sCol;
int spos = 0;
int pixel = 0;
while (col < width) {
if (wPixels != null) {
switch (combinedType) {
case COLOR | ALPHA | (8 << 3):
wPixels[col + rowOffset] =
((rowByteBuffer[spos] & 0xFF) << 16)
| ((rowByteBuffer[spos + 1] & 0xFF) << 8)
| ((rowByteBuffer[spos + 2] & 0xFF))
| ((rowByteBuffer[spos + 3] & 0xFF) << 24);
spos += 4;
break;
case COLOR | ALPHA | (16 << 3):
wPixels[col + rowOffset] =
((rowByteBuffer[spos] & 0xFF) << 16)
| ((rowByteBuffer[spos + 2] & 0xFF) << 8)
| ((rowByteBuffer[spos + 4] & 0xFF))
| ((rowByteBuffer[spos + 6] & 0xFF) << 24);
spos += 8;
break;
case COLOR | (8 << 3):
pixel =
((rowByteBuffer[spos] & 0xFF) << 16)
| ((rowByteBuffer[spos + 1] & 0xFF) << 8)
| ((rowByteBuffer[spos + 2] & 0xFF));
if (pixel != transparentPixel) {
pixel |= 0xff000000;
}
wPixels[col + rowOffset] = pixel;
spos += 3;
break;
case COLOR | (16 << 3):
pixel =
((rowByteBuffer[spos] & 0xFF) << 16)
| ((rowByteBuffer[spos + 2] & 0xFF) << 8)
| ((rowByteBuffer[spos + 4] & 0xFF));
boolean isTransparent = (transparentPixel_16 != null);
for (int i = 0; isTransparent && (i < 6); i++) {
isTransparent &=
(rowByteBuffer[spos + i] & 0xFF) == (transparentPixel_16[i] & 0xFF);
}
if (!isTransparent) {
pixel |= 0xff000000;
}
wPixels[col + rowOffset] = pixel;
spos += 6;
break;
case GRAY | ALPHA | (8 << 3):
{
int tx = rowByteBuffer[spos] & 0xFF;
wPixels[col + rowOffset] =
(tx << 16) | (tx << 8) | tx | ((rowByteBuffer[spos + 1] & 0xFF) << 24);
}
spos += 2;
break;
case GRAY | ALPHA | (16 << 3):
{
int tx = rowByteBuffer[spos] & 0xFF;
wPixels[col + rowOffset] =
(tx << 16) | (tx << 8) | tx | ((rowByteBuffer[spos + 2] & 0xFF) << 24);
}
spos += 4;
break;
default:
throw new PNGException("illegal type/depth");
}
} else
switch (bitDepth) {
case 1:
bPixels[col + rowOffset] =
(byte) ((rowByteBuffer[spos >> 3] >> (7 - (spos & 7))) & 1);
spos++;
break;
case 2:
bPixels[col + rowOffset] =
(byte) ((rowByteBuffer[spos >> 2] >> ((3 - (spos & 3)) * 2)) & 3);
spos++;
break;
case 4:
bPixels[col + rowOffset] =
(byte) ((rowByteBuffer[spos >> 1] >> ((1 - (spos & 1)) * 4)) & 15);
spos++;
break;
case 8:
bPixels[col + rowOffset] = rowByteBuffer[spos++];
break;
case 16:
bPixels[col + rowOffset] = rowByteBuffer[spos];
spos += 2;
break;
default:
throw new PNGException("illegal type/depth");
}
/*visit (row, col,
min (bHeight, height - row),
min (bWidth, width - col)); */
col += colInc;
}
if (interlaceMethod == 0)
if (wPixels != null) {
/* code changed. target not needed here
t.setPixels(0,row,width,1,cm,wPixels,0,width);
*/
// code added to make it work with ImageDecoder arch
sendPixels(0, row, width, 1, wPixels, 0, width);
// end of adding
} else {
/* code changed. target not needed here
t.setPixels(0,row,width,1,cm,bPixels,0,width);
*/
// code added to make it work with ImageDecoder arch
sendPixels(0, row, width, 1, bPixels, 0, width);
// end of adding
}
row += rowInc;
rowOffset += rowInc * rowStride;
byte[] T = rowByteBuffer;
rowByteBuffer = prevRowByteBuffer;
prevRowByteBuffer = T;
firstRow = false;
}
if (interlaceMethod != 0)
if (wPixels != null) {
/* code changed. target not needed here
t.setPixels(0,0,width,height,cm,wPixels,0,width);
*/
// code added to make it work with ImageDecoder arch
sendPixels(0, 0, width, height, wPixels, 0, width);
// end of adding
} else {
/* code changed. target not needed here
t.setPixels(0,0,width,height,cm,bPixels,0,width);
*/
// code added to make it work with ImageDecoder arch
sendPixels(0, 0, width, height, bPixels, 0, width);
// end of adding
}
}
/* Here, the function "visit(row,column,height,width)" obtains the
next transmitted pixel and paints a rectangle of the specified
height and width, whose upper-left corner is at the specified row
and column, using the color indicated by the pixel. Note that row
and column are measured from 0,0 at the upper left corner. */
/* code not needed, don't deal with target
if((t=target)!=null) {
if(properties!=null) t.setProperties(properties);
t.imageComplete(ImageConsumer.STATICIMAGEDONE);
*/
imageComplete(ImageConsumer.STATICIMAGEDONE, true);
/* code not needed }
is.close();
*/
} catch (IOException e) {
if (!aborted) {
/* code not needed
if((t=target)!=null) {
PNGEncoder.prChunk(e.toString(),inbuf,pos,limit-pos,true);
*/
property("error", e);
/* code not needed
t.setProperties(properties);
t.imageComplete(ImageConsumer.IMAGEERROR|ImageConsumer.STATICIMAGEDONE);
*/
imageComplete(ImageConsumer.IMAGEERROR | ImageConsumer.STATICIMAGEDONE, true);
throw e;
}
} finally {
try {
close();
} catch (Throwable e) {
}
/* code not needed
target = null;
endTurn();
*/
}
}
private void property(String key, float value) {
property(key, new Float(value));
}
protected boolean handleChunk(int key, byte[] buf, int st, int len) throws IOException {
switch (key) {
case bKGDChunk:
Color c = null;
switch (colorType) {
case COLOR:
case COLOR | ALPHA:
pngassert(len == 6);
c = new Color(buf[st] & 0xff, buf[st + 2] & 0xff, buf[st + 4] & 0xff);
break;
case COLOR | PALETTE:
case COLOR | PALETTE | ALPHA:
pngassert(len == 1);
int ix = buf[st] & 0xFF;
pngassert(red_map != null && ix < red_map.length);
c = new Color(red_map[ix] & 0xff, green_map[ix] & 0xff, blue_map[ix] & 0xff);
break;
case GRAY:
case GRAY | ALPHA:
pngassert(len == 2);
int t = buf[st] & 0xFF;
c = new Color(t, t, t);
break;
}
if (c != null) property("background", c);
break;
case cHRMChunk:
property(
"chromaticities",
new Chromaticities(
getInt(st),
getInt(st + 4),
getInt(st + 8),
getInt(st + 12),
getInt(st + 16),
getInt(st + 20),
getInt(st + 24),
getInt(st + 28)));
break;
case gAMAChunk:
if (len != 4) throw new PNGException("bogus gAMA");
gamma = getInt(st);
if (gamma != 100000) property("gamma", gamma / 100000.0f);
break;
case hISTChunk:
break;
case IDATChunk:
return false;
case IENDChunk:
break;
case IHDRChunk:
if (len != 13 || (width = getInt(st)) == 0 || (height = getInt(st + 4)) == 0)
throw new PNGException("bogus IHDR");
bitDepth = getByte(st + 8);
colorType = getByte(st + 9);
compressionMethod = getByte(st + 10);
filterMethod = getByte(st + 11);
interlaceMethod = getByte(st + 12);
/* this is not needed
if(target!=null) target.setDimensions(width,height);
*/
break;
case PLTEChunk:
{
int tsize = len / 3;
red_map = new byte[tsize];
green_map = new byte[tsize];
blue_map = new byte[tsize];
for (int i = 0, j = st; i < tsize; i++, j += 3) {
red_map[i] = buf[j];
green_map[i] = buf[j + 1];
blue_map[i] = buf[j + 2];
}
}
break;
case pHYsChunk:
break;
case sBITChunk:
break;
case tEXtChunk:
int klen = 0;
while (klen < len && buf[st + klen] != 0) klen++;
if (klen < len) {
String tkey = new String(buf, st, klen);
String tvalue = new String(buf, st + klen + 1, len - klen - 1);
property(tkey, tvalue);
}
break;
case tIMEChunk:
property(
"modtime",
new GregorianCalendar(
getShort(st + 0),
getByte(st + 2) - 1,
getByte(st + 3),
getByte(st + 4),
getByte(st + 5),
getByte(st + 6))
.getTime());
break;
case tRNSChunk:
switch (colorType) {
case PALETTE | COLOR:
case PALETTE | COLOR | ALPHA:
int alen = len;
if (red_map != null) alen = red_map.length;
alpha_map = new byte[alen];
System.arraycopy(buf, st, alpha_map, 0, len < alen ? len : alen);
while (--alen >= len) alpha_map[alen] = (byte) 0xFF;
break;
case COLOR: // doesn't deal with 16 bit colors properly
case COLOR | ALPHA: // doesn't deal with 16 bit colors properly
pngassert(len == 6);
if (bitDepth == 16) {
transparentPixel_16 = new byte[6];
for (int i = 0; i < 6; i++) {
transparentPixel_16[i] = (byte) getByte(st + i);
}
} else {
transparentPixel =
((getShort(st + 0) & 0xFF) << 16)
| ((getShort(st + 2) & 0xFF) << 8)
| ((getShort(st + 4) & 0xFF));
}
break;
case GRAY: // doesn't deal with 16 bit colors properly
case GRAY | ALPHA: // doesn't deal with 16 bit colors properly
pngassert(len == 2);
/* REMIND: Discarding the LSB for 16 bit depth here
* means that the all pixels which match the MSB
* will be treated as transparent.
*/
int t = getShort(st);
t = 0xFF & ((bitDepth == 16) ? (t >> 8) : t);
transparentPixel = (t << 16) | (t << 8) | t;
break;
}
break;
case zTXtChunk:
break;
}
return true;
}
