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TIFF tile support.

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This commit is contained in:
Harald Kuhr 2019-08-29 19:10:46 +02:00
parent 0c2433dc9f
commit f449a50d64
1 changed files with 68 additions and 6 deletions
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74
imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageReader.java
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@ -2481,12 +2481,74 @@ public final class TIFFImageReader extends ImageReaderBase {
return read(imageIndex, param).getData();
}
// TODO: Tiling support
// isImageTiled
// getTileWidth
// getTileHeight
// readTile
// readTileRaster
/// Tiling support
@Override
public boolean isImageTiled(int imageIndex) throws IOException {
readIFD(imageIndex);
// TODO: Treat strips as tiles? (TIFF.TAG_ROWS_PER_STRIP)
return currentIFD.getEntryById(TIFF.TAG_TILE_WIDTH) != null
&& currentIFD.getEntryById(TIFF.TAG_TILE_HEIGTH) != null;
}
@Override
public int getTileWidth(int imageIndex) throws IOException {
readIFD(imageIndex);
int tileWidth = getValueAsIntWithDefault(TIFF.TAG_TILE_WIDTH, -1);
if (tileWidth > 0) {
return tileWidth;
}
return getWidth(imageIndex);
}
@Override
public int getTileHeight(int imageIndex) throws IOException {
readIFD(imageIndex);
int tileHeight = getValueAsIntWithDefault(TIFF.TAG_TILE_HEIGTH, -1);
if (tileHeight > 0) {
return tileHeight;
}
return getHeight(imageIndex);
}
private Rectangle computeTileRegion(int imageIndex, int tileX, int tileY) throws IOException {
int tileWidth = getTileWidth(imageIndex);
int tileHeight = getTileHeight(imageIndex);
int width = getWidth(imageIndex);
int height = getHeight(imageIndex);
int xOffset = tileX * tileWidth;
int yOffset = tileY * tileHeight;
int regionWidth = Math.min(tileWidth, width - xOffset);
int regionHeight = Math.min(tileHeight, height - yOffset);
if (tileX < 0 || tileY < 0 || regionWidth < 0 || regionHeight < 0) {
// NOTE: The readTileXxx methods specification requires this to be IllegalArgument, not OutOfBounds...
throw new IllegalArgumentException("Tile [" + tileX + "," + tileY + "] out of bounds");
}
return new Rectangle(xOffset, yOffset, regionWidth, regionHeight);
}
@Override
public BufferedImage readTile(int imageIndex, int tileX, int tileY) throws IOException {
ImageReadParam param = getDefaultReadParam();
param.setSourceRegion(computeTileRegion(imageIndex, tileX, tileY));
return read(imageIndex, param);
}
@Override
public Raster readTileRaster(int imageIndex, int tileX, int tileY) throws IOException {
ImageReadParam param = getDefaultReadParam();
param.setSourceRegion(computeTileRegion(imageIndex, tileX, tileY));
return readRaster(imageIndex, param);
}
// TODO: Thumbnail support