ossimRefPtr<ossimImageData> ossimKakaduJ2kReader::getTile(
const ossimIrect& rect, ossim_uint32 resLevel)
{
// This tile source bypassed, or invalid res level, return a blank tile.
if(!isSourceEnabled() || !isOpen() || !isValidRLevel(resLevel))
{
return ossimRefPtr<ossimImageData>();
}
if (theTile.valid())
{
// Rectangle must be set prior to getOverviewTile call.
theTile->setImageRectangle(rect);
if (resLevel)
{
if ( getOverviewTile(resLevel, theTile.get() ) == false )
{
theTile->makeBlank();
}
}
else
{
//---
// See if the whole tile is going to be filled, if not, start out with
// a blank tile so data from a previous load gets wiped out.
//---
if ( !rect.completely_within(theImageRect) )
{
// Start with a blank tile.
theTile->makeBlank();
}
//---
// See if any point of the requested tile is in the image.
//---
if ( rect.intersects(theImageRect) )
{
ossimIrect clipRect = rect.clipToRect(theImageRect);
ossimIrect exandedRect = clipRect;
//---
// Shift the upper left corner of the "clip_rect" to the an even
// j2k tile boundry.
//---
exandedRect.stretchToTileBoundary(ossimIpt(theTileSizeX,
theTileSizeY));
// Vertical tile loop.
ossim_int32 y = exandedRect.ul().y;
while (y < exandedRect.lr().y)
{
// Horizontal tile loop.
ossim_int32 x = exandedRect.ul().x;
while (x < exandedRect.lr().x)
{
if ( loadTileFromCache(x, y, clipRect) == false )
{
if ( loadTile(x, y) )
{
//---
// Note: Clip the cache tile to the image clipRect
// since there are j2k tiles that go beyond the image
// dimensions, i.e., edge tiles.
//---
ossimIrect cr =
theCacheTile->getImageRectangle().
clipToRect(clipRect);
theTile->loadTile(theCacheTile->getBuf(),
theCacheTile->getImageRectangle(),
cr,
OSSIM_BSQ);
}
}
x += theTileSizeX; // Go to next tile.
}
y += theTileSizeY; // Go to next row of tiles.
}
// Set the tile status.
theTile->validate();
} // matches: if ( rect.intersects(theImageRect) )
} // r0 block
} // matches: if (theTile.valid())
return theTile;
}
ossimRefPtr<ossimImageData> ossimMrSidReader::getTile(
const ossimIrect& rect, ossim_uint32 resLevel)
{
LT_STATUS sts = LT_STS_Uninit;
// This tile source bypassed, or invalid res level, return null tile.
if(!isSourceEnabled() || !isOpen() || !isValidRLevel(resLevel))
{
return ossimRefPtr<ossimImageData>();
}
ossimIrect imageBound = getBoundingRect(resLevel);
if(!rect.intersects(imageBound))
{
return ossimRefPtr<ossimImageData>();
}
// Check for overview.
if( resLevel > theMinDwtLevels )
{
if(theOverview.valid())
{
ossimRefPtr<ossimImageData> tileData = theOverview->getTile(rect, resLevel);
tileData->setScalarType(getOutputScalarType());
return tileData;
}
}
theTile->setImageRectangle(rect);
// Compute clip rectangle with respect to the image bounds.
ossimIrect clipRect = rect.clipToRect(imageBound);
if (rect.completely_within(clipRect) == false)
{
// Not filling whole tile so blank it out first.
theTile->makeBlank();
}
lt_uint16 anOssimBandIndex = 0;
LTIPixel pixel(theReader->getColorSpace(), theNumberOfBands, theReader->getDataType());
LTISceneBuffer sceneBuffer(pixel, clipRect.width(), clipRect.height(), NULL);
if (!theGeometry.valid())
{
theGeometry = getImageGeometry();
}
double mag = theGeometry->decimationFactor(resLevel).lat;
sts = theImageNavigator->setSceneAsULWH(clipRect.ul().x,
clipRect.ul().y,
clipRect.lr().x - clipRect.ul().x + 1,
clipRect.lr().y - clipRect.ul().y + 1, mag);
LTIScene scene = theImageNavigator->getScene();
sts = theReader->read(scene, sceneBuffer);
if (LT_SUCCESS(sts) == true)
{
for(anOssimBandIndex = 0; anOssimBandIndex < theNumberOfBands; anOssimBandIndex++)
{
theTile->loadBand(sceneBuffer.getTotalBandData(anOssimBandIndex),
clipRect, anOssimBandIndex);
}
}
theTile->validate();
return theTile;
}
