/*****************************************************************************/
// Copyright 2006-2007 Adobe Systems Incorporated
// All Rights Reserved.
//
// NOTICE:  Adobe permits you to use, modify, and distribute this file in
// accordance with the terms of the Adobe license agreement accompanying it.
/*****************************************************************************/

/* $Id: //mondo/dng_sdk_1_2/dng_sdk/source/dng_ifd.cpp#1 $ */
/* $DateTime: 2008/03/09 14:29:54 $ */
/* $Change: 431850 $ */
/* $Author: tknoll $ */

/*****************************************************************************/

#include "dng_ifd.h"
#include "dng_exceptions.h"
#include "dng_globals.h"
#include "dng_parse_utils.h"
#include "dng_read_image.h"
#include "dng_stream.h"
#include "dng_tag_codes.h"
#include "dng_tag_types.h"
#include "dng_tag_values.h"
#include "dng_types.h"
#include "dng_utils.h"

/*****************************************************************************/

dng_preview_info::dng_preview_info ()

	:	fIsPrimary          (true)
	,	fApplicationName    ()
	,	fApplicationVersion ()
	,	fSettingsName       ()
	,	fSettingsDigest     ()
	,	fColorSpace			(previewColorSpace_MaxEnum)
	,	fDateTime			()

	{

	}

/*****************************************************************************/

dng_preview_info::~dng_preview_info ()
	{

	}

/*****************************************************************************/

dng_ifd::dng_ifd ()

	:	fUsesNewSubFileType (false)
	,	fNewSubFileType     (0)

	,	fImageWidth  (0)
	,	fImageLength (0)

	,	fCompression (ccUncompressed)
	,	fPredictor   (cpNullPredictor)

	,	fPhotometricInterpretation (0xFFFFFFFF)

	,	fFillOrder (1)

	,	fOrientation          (0)
	,	fOrientationType      (0)
	,	fOrientationOffset    (kDNGStreamInvalidOffset)
	,	fOrientationBigEndian (false)

	,	fSamplesPerPixel (1)

	,	fPlanarConfiguration (pcInterleaved)

	,	fXResolution    (0.0)
	,	fYResolution    (0.0)
	,	fResolutionUnit (0)

	,	fUsesStrips (false)
	,	fUsesTiles  (false)

	,	fTileWidth  (0)
	,	fTileLength (0)

	,	fTileOffsetsType   (0)
	,	fTileOffsetsCount  (0)
	,	fTileOffsetsOffset (0)

	,	fTileByteCountsType   (0)
	,	fTileByteCountsCount  (0)
	,	fTileByteCountsOffset (0)

	,	fSubIFDsCount  (0)
	,	fSubIFDsOffset (0)

	,	fExtraSamplesCount (0)

	,	fJPEGTablesCount  (0)
	,	fJPEGTablesOffset (0)

	,	fJPEGInterchangeFormat		 (0)
	,	fJPEGInterchangeFormatLength (0)

	,	fYCbCrCoefficientR (0.0)
	,	fYCbCrCoefficientG (0.0)
	,	fYCbCrCoefficientB (0.0)

	,	fYCbCrSubSampleH (0)
	,	fYCbCrSubSampleV (0)

	,	fYCbCrPositioning (0)

	,	fCFARepeatPatternRows (0)
	,	fCFARepeatPatternCols (0)

	,	fCFALayout (1)

	,	fLinearizationTableType   (0)
	,	fLinearizationTableCount  (0)
	,	fLinearizationTableOffset (0)

	,	fBlackLevelRepeatRows (1)
	,	fBlackLevelRepeatCols (1)

	,	fBlackLevelDeltaHType   (0)
	,	fBlackLevelDeltaHCount  (0)
	,	fBlackLevelDeltaHOffset (0)

	,	fBlackLevelDeltaVType   (0)
	,	fBlackLevelDeltaVCount  (0)
	,	fBlackLevelDeltaVOffset (0)

	,	fDefaultScaleH (1, 1)
	,	fDefaultScaleV (1, 1)

	,	fBestQualityScale (1, 1)

	,	fDefaultCropOriginH (0, 1)
	,	fDefaultCropOriginV (0, 1)

	,	fDefaultCropSizeH ()
	,	fDefaultCropSizeV ()

	,	fBayerGreenSplit (0)

	,	fChromaBlurRadius ()

	,	fAntiAliasStrength (1, 1)

	,	fActiveArea ()

	,	fMaskedAreaCount (0)

	,	fRowInterleaveFactor (1)

	,	fSubTileBlockRows (1)
	,	fSubTileBlockCols (1)

	,	fPreviewInfo ()

	,	fLosslessJPEGBug16 (false)

	,	fSampleBitShift (0)

	,	fThisIFD (0)
	,	fNextIFD (0)

	{

	uint32 j;
	uint32 k;
	uint32 n;

	for (j = 0; j < kMaxSamplesPerPixel; j++)
		{
		fBitsPerSample [j] = 0;
		}

	for (j = 0; j < kMaxTileInfo; j++)
		{
		fTileOffset    [j] = 0;
		fTileByteCount [j] = 0;
		}

	for (j = 0; j < kMaxSamplesPerPixel; j++)
		{
		fExtraSamples [j] = esUnspecified;
		}

	for (j = 0; j < kMaxSamplesPerPixel; j++)
		{
		fSampleFormat [j] = sfUnsignedInteger;
		}

	for (j = 0; j < 6; j++)
		{
		fReferenceBlackWhite [j] = 0.0;
		}

	for (j = 0; j < kMaxCFAPattern; j++)
		for (k = 0; k < kMaxCFAPattern; k++)
			{
			fCFAPattern [j] [k] = 255;
			}

	for (j = 0; j < kMaxColorPlanes; j++)
		{
		fCFAPlaneColor [j] = (uint8) (j < 3 ? j : 255);
		}

	for (j = 0; j < kMaxBlackPattern; j++)
		for (k = 0; k < kMaxBlackPattern; k++)
			for (n = 0; n < kMaxSamplesPerPixel; n++)
				{
				fBlackLevel [j] [k] [n] = 0.0;
				}

	for (j = 0; j < kMaxSamplesPerPixel; j++)
		{
		fWhiteLevel [j] = -1.0;		// Don't know real default yet.
		}

	}

/*****************************************************************************/

dng_ifd::~dng_ifd ()
	{

	}

/*****************************************************************************/

// Parses tags that should only appear in IFDs that contain images.

bool dng_ifd::ParseTag (dng_stream &stream,
						uint32 parentCode,
						uint32 tagCode,
						uint32 tagType,
						uint32 tagCount,
						uint64 tagOffset)
	{

	uint32 j;
	uint32 k;
	uint32 n;

	switch (tagCode)
		{

		case tcNewSubFileType:
			{

			CheckTagType (parentCode, tagCode, tagType, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fUsesNewSubFileType = true;

			fNewSubFileType = stream.TagValue_uint32 (tagType);

			fPreviewInfo.fIsPrimary = (fNewSubFileType == sfPreviewImage);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("NewSubFileType: %s\n",
						LookupNewSubFileType (fNewSubFileType));

				}

			#endif

			break;

			}

		case tcImageWidth:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fImageWidth = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("ImageWidth: %u\n", (unsigned) fImageWidth);
				}

			#endif

			break;

			}

		case tcImageLength:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fImageLength = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("ImageLength: %u\n", (unsigned) fImageLength);
				}

			#endif

			break;

			}

		case tcBitsPerSample:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1, 0x0FFFF);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("BitsPerSample:");
				}

			#endif

			bool extrasMatch = true;

			for (j = 0; j < tagCount; j++)
				{

				uint32 x = stream.TagValue_uint32 (tagType);

				if (j < kMaxSamplesPerPixel)
					{
					fBitsPerSample [j] = x;
					}

				else if (x != fBitsPerSample [kMaxSamplesPerPixel - 1])
					{
					extrasMatch = false;
					}

				#if qDNGValidate

				if (gVerbose)
					{
					printf (" %u", (unsigned) x);
					}

				#endif

				}

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("\n");
				}

			#endif

			if (!extrasMatch)
				{

				#if qDNGValidate

				ReportError ("BitsPerSample not constant");

				#endif

				ThrowBadFormat ();

				}

			break;

			}

		case tcCompression:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fCompression = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("Compression: %s\n",
					    LookupCompression (fCompression));

				}

			#endif

			// Correct a common TIFF writer mistake.

			if (fCompression == 0)
				{

				#if qDNGValidate

					{

					char message [256];

					sprintf (message,
							 "%s has invalid zero compression code",
							 LookupParentCode (parentCode));

					ReportWarning (message);

					}

				#endif

				fCompression = ccUncompressed;

				}

			break;

			}

		case tcPhotometricInterpretation:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fPhotometricInterpretation = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("PhotometricInterpretation: %s\n",
						LookupPhotometricInterpretation (fPhotometricInterpretation));

				}

			#endif

			break;

			}

		case tcFillOrder:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fFillOrder = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("FillOrder: %u\n", (unsigned) fFillOrder);
				}

			#endif

			break;

			}

		case tcStripOffsets:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			fUsesStrips = true;

			fTileOffsetsType   = tagType;
			fTileOffsetsCount  = tagCount;
			fTileOffsetsOffset = tagOffset;

			if (tagCount <= kMaxTileInfo)
				{

				for (j = 0; j < tagCount; j++)
					{

					fTileOffset [j] = stream.TagValue_uint32 (tagType);

					}

				}

			#if qDNGValidate

			if (gVerbose)
				{

				stream.SetReadPosition (tagOffset);

				DumpTagValues (stream,
							   "Offset",
							   parentCode,
							   tagCode,
							   tagType,
							   tagCount);

				}

			#endif

			break;

			}

		case tcOrientation:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fOrientationType      = tagType;
			fOrientationOffset    = stream.PositionInOriginalFile ();
			fOrientationBigEndian = stream.BigEndian ();

			fOrientation = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("Orientation: %s\n",
					    LookupOrientation (fOrientation));

				}

			#endif

			break;

			}

		case tcSamplesPerPixel:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fSamplesPerPixel = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("SamplesPerPixel: %u\n", (unsigned) fSamplesPerPixel);
				}

			#endif

			break;

			}

		case tcRowsPerStrip:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fUsesStrips = true;

			fTileLength = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("RowsPerStrip: %u\n", (unsigned) fTileLength);
				}

			#endif

			break;

			}

		case tcStripByteCounts:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			fUsesStrips = true;

			fTileByteCountsType   = tagType;
			fTileByteCountsCount  = tagCount;
			fTileByteCountsOffset = tagOffset;

			if (tagCount <= kMaxTileInfo)
				{

				for (j = 0; j < tagCount; j++)
					{

					fTileByteCount [j] = stream.TagValue_uint32 (tagType);

					}

				}

			#if qDNGValidate

			if (gVerbose)
				{

				stream.SetReadPosition (tagOffset);

				DumpTagValues (stream,
							   "Count",
							   parentCode,
							   tagCode,
							   tagType,
							   tagCount);

				}

			#endif

			break;

			}

		case tcXResolution:
			{

			CheckTagType (parentCode, tagCode, tagType, ttRational);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fXResolution = stream.TagValue_real64 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("XResolution: %0.2f\n", fXResolution);
				}

			#endif

			break;

			}

		case tcYResolution:
			{

			CheckTagType (parentCode, tagCode, tagType, ttRational);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fYResolution = stream.TagValue_real64 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("YResolution: %0.2f\n", fYResolution);
				}

			#endif

			break;

			}

		case tcPlanarConfiguration:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fPlanarConfiguration = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("PlanarConfiguration: %u\n", (unsigned) fPlanarConfiguration);
				}

			#endif

			break;

			}

		case tcResolutionUnit:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fResolutionUnit = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("ResolutionUnit: %s\n",
					    LookupResolutionUnit (fResolutionUnit));

				}

			#endif

			break;

			}

		case tcPredictor:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fPredictor = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("Predictor: %u\n", (unsigned) fPredictor);

				}

			#endif

			break;

			}

		case tcTileWidth:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fUsesTiles = true;

			fTileWidth = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("TileWidth: %u\n", (unsigned) fTileWidth);
				}

			#endif

			break;

			}

		case tcTileLength:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fUsesTiles = true;

			fTileLength = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("TileLength: %u\n", (unsigned) fTileLength);
				}

			#endif

			break;

			}

		case tcTileOffsets:
			{

			CheckTagType (parentCode, tagCode, tagType, ttLong);

			fUsesTiles = true;

			fTileOffsetsType   = tagType;
			fTileOffsetsCount  = tagCount;
			fTileOffsetsOffset = tagOffset;

			if (tagCount <= kMaxTileInfo)
				{

				for (j = 0; j < tagCount; j++)
					{

					fTileOffset [j] = stream.TagValue_uint32 (tagType);

					}

				}

			#if qDNGValidate

			if (gVerbose)
				{

				stream.SetReadPosition (tagOffset);

				DumpTagValues (stream,
							   "Offset",
							   parentCode,
							   tagCode,
							   tagType,
							   tagCount);

				}

			#endif

			break;

			}

		case tcTileByteCounts:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			fUsesTiles = true;

			fTileByteCountsType   = tagType;
			fTileByteCountsCount  = tagCount;
			fTileByteCountsOffset = tagOffset;

			if (tagCount <= kMaxTileInfo)
				{

				for (j = 0; j < tagCount; j++)
					{

					fTileByteCount [j] = stream.TagValue_uint32 (tagType);

					}

				}

			#if qDNGValidate

			if (gVerbose)
				{

				stream.SetReadPosition (tagOffset);

				DumpTagValues (stream,
							   "Count",
							   parentCode,
							   tagCode,
							   tagType,
							   tagCount);

				}

			#endif

			break;

			}

		case tcSubIFDs:
			{

			CheckTagType (parentCode, tagCode, tagType, ttLong, ttIFD);

			fSubIFDsCount  = tagCount;
			fSubIFDsOffset = tagOffset;

			#if qDNGValidate

			if (gVerbose)
				{

				DumpTagValues (stream,
							   "IFD",
							   parentCode,
							   tagCode,
							   ttLong,
							   tagCount);

				}

			#endif

			break;

			}

		case tcExtraSamples:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1, fSamplesPerPixel);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("ExtraSamples:");
				}

			#endif

			fExtraSamplesCount = tagCount;

			for (j = 0; j < tagCount; j++)
				{

				uint32 x = stream.TagValue_uint32 (tagType);

				if (j < kMaxSamplesPerPixel)
					{
					fExtraSamples [j] = x;
					}

				#if qDNGValidate

				if (gVerbose)
					{
					printf (" %u", (unsigned) x);
					}

				#endif

				}

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("\n");
				}

			#endif

			break;

			}

		case tcSampleFormat:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, fSamplesPerPixel);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("SampleFormat:");
				}

			#endif

			bool extrasMatch = true;

			for (j = 0; j < tagCount; j++)
				{

				uint32 x = stream.TagValue_uint32 (tagType);

				if (j < kMaxSamplesPerPixel)
					{
					fSampleFormat [j] = x;
					}

				else if (x != fSampleFormat [kMaxSamplesPerPixel - 1])
					{
					extrasMatch = false;
					}

				#if qDNGValidate

				if (gVerbose)
					{
					printf (" %u", (unsigned) x);
					}

				#endif

				}

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("\n");
				}

			#endif

			if (!extrasMatch)
				{

				#if qDNGValidate

				ReportError ("SampleFormat not constant");

				#endif

				ThrowBadFormat ();

				}

			break;

			}

		case tcJPEGTables:
			{

			CheckTagType (parentCode, tagCode, tagType, ttUndefined);

			fJPEGTablesCount  = tagCount;
			fJPEGTablesOffset = tagOffset;

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("JPEGTables: count = %u, offset = %u\n",
						(unsigned) fJPEGTablesCount,
						(unsigned) fJPEGTablesOffset);

				}

			#endif

			break;

			}

		case tcJPEGInterchangeFormat:
			{

			CheckTagType (parentCode, tagCode, tagType, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fJPEGInterchangeFormat = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("JPEGInterchangeFormat: %u\n",
						(unsigned) fJPEGInterchangeFormat);
				}

			#endif

			break;

			}

		case tcJPEGInterchangeFormatLength:
			{

			CheckTagType (parentCode, tagCode, tagType, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fJPEGInterchangeFormatLength = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("JPEGInterchangeFormatLength: %u\n",
						(unsigned) fJPEGInterchangeFormatLength);
				}

			#endif

			break;

			}

		case tcYCbCrCoefficients:
			{

			CheckTagType (parentCode, tagCode, tagType, ttRational);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 3))
				{
				return false;
				}

			fYCbCrCoefficientR = stream.TagValue_real64 (tagType);
			fYCbCrCoefficientG = stream.TagValue_real64 (tagType);
			fYCbCrCoefficientB = stream.TagValue_real64 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("YCbCrCoefficients: R = %0.3f, G = %0.3f, B = %0.3f\n",
						fYCbCrCoefficientR,
						fYCbCrCoefficientG,
						fYCbCrCoefficientB);

				}

			#endif

			break;

			}

		case tcYCbCrSubSampling:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 2))
				{
				return false;
				}

			fYCbCrSubSampleH = stream.TagValue_uint32 (tagType);
			fYCbCrSubSampleV = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("YCbCrSubSampling: H = %u, V = %u\n",
						(unsigned) fYCbCrSubSampleH,
						(unsigned) fYCbCrSubSampleV);

				}

			#endif

			break;

			}

		case tcYCbCrPositioning:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fYCbCrPositioning = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("YCbCrPositioning: %u\n",
						(unsigned) fYCbCrPositioning);

				}

			#endif

			break;

			}

		case tcReferenceBlackWhite:
			{

			CheckTagType (parentCode, tagCode, tagType, ttRational);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 6))
				{
				return false;
				}

			for (j = 0; j < 6; j++)
				{
				fReferenceBlackWhite [j] = stream.TagValue_real64 (tagType);
				}

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("ReferenceBlackWhite: %0.1f %0.1f %0.1f %0.1f %0.1f %0.1f\n",
						fReferenceBlackWhite [0],
						fReferenceBlackWhite [1],
						fReferenceBlackWhite [2],
						fReferenceBlackWhite [3],
						fReferenceBlackWhite [4],
						fReferenceBlackWhite [5]);

				}

			#endif

			break;

			}

		case tcCFARepeatPatternDim:
			{

			CheckCFA (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 2))
				{
				return false;
				}

			fCFARepeatPatternRows = stream.TagValue_uint32 (tagType);
			fCFARepeatPatternCols = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("CFARepeatPatternDim: Rows = %u, Cols = %u\n",
						(unsigned) fCFARepeatPatternRows,
						(unsigned) fCFARepeatPatternCols);

				}

			#endif

			break;

			}

		case tcCFAPattern:
			{

			CheckCFA (parentCode, tagCode, fPhotometricInterpretation);

			if (!CheckTagType (parentCode, tagCode, tagType, ttByte))
				{
				return false;
				}

			if (!CheckTagCount (parentCode, tagCode, tagCount, fCFARepeatPatternRows *
															   fCFARepeatPatternCols))
				{
				return false;
				}

			if (fCFARepeatPatternRows < 1 || fCFARepeatPatternRows > kMaxCFAPattern ||
				fCFARepeatPatternCols < 1 || fCFARepeatPatternCols > kMaxCFAPattern)
				{
				return false;
				}

			// Note that the Exif spec stores this array in a different
			// scan order than the TIFF-EP spec.

			for (j = 0; j < fCFARepeatPatternRows; j++)
				for (k = 0; k < fCFARepeatPatternCols; k++)
					{

					fCFAPattern [j] [k] = stream.Get_uint8 ();

					}

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("CFAPattern:\n");

				for (j = 0; j < fCFARepeatPatternRows; j++)
					{

					int32 spaces = 4;

					for (k = 0; k < fCFARepeatPatternCols; k++)
						{

						while (spaces-- > 0)
							{
							printf (" ");
							}

						const char *name = LookupCFAColor (fCFAPattern [j] [k]);

						spaces = 9 - (int32) strlen (name);

						printf ("%s", name);

						}

					printf ("\n");

					}

				}

			#endif

			break;

			}

		case tcCFAPlaneColor:
			{

			CheckCFA (parentCode, tagCode, fPhotometricInterpretation);

			if (!CheckTagType (parentCode, tagCode, tagType, ttByte))
				{
				return false;
				}

			if (!CheckTagCount (parentCode, tagCode, tagCount, 3, kMaxColorPlanes))
				{
				return false;
				}

			for (j = 0; j < kMaxColorPlanes; j++)
				{

				if (j < tagCount)
					fCFAPlaneColor [j] = stream.Get_uint8 ();

				else
					fCFAPlaneColor [j] = 255;

				}

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("CFAPlaneColor:");

				for (j = 0; j < tagCount; j++)
					{

					printf (" %s", LookupCFAColor (fCFAPlaneColor [j]));

					}

				printf ("\n");

				}

			#endif

			break;

			}

		case tcCFALayout:
			{

			CheckCFA (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fCFALayout = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("CFALayout: %s\n",
						LookupCFALayout (fCFALayout));

				}

			#endif

			break;

			}

		case tcLinearizationTable:
			{

			CheckRawIFD (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			fLinearizationTableType   = tagType;
			fLinearizationTableCount  = tagCount;
			fLinearizationTableOffset = tagOffset;

			#if qDNGValidate

			if (gVerbose)
				{

				DumpTagValues (stream,
							   "Table",
							   parentCode,
							   tagCode,
							   tagType,
							   tagCount);

				}

			#endif

			break;

			}

		case tcBlackLevelRepeatDim:
			{

			CheckRawIFD (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttShort);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 2))
				{
				return false;
				}

			fBlackLevelRepeatRows = stream.TagValue_uint32 (tagType);
			fBlackLevelRepeatCols = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("BlackLevelRepeatDim: Rows = %u, Cols = %u\n",
						(unsigned) fBlackLevelRepeatRows,
						(unsigned) fBlackLevelRepeatCols);

				}

			#endif

			break;

			}

		case tcBlackLevel:
			{

			CheckRawIFD (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong, ttRational);

			if (!CheckTagCount (parentCode, tagCode, tagCount, fBlackLevelRepeatRows *
															   fBlackLevelRepeatCols *
															   fSamplesPerPixel))
				{
				return false;
				}

			if (fBlackLevelRepeatRows < 1 || fBlackLevelRepeatRows > kMaxBlackPattern   ||
				fBlackLevelRepeatCols < 1 || fBlackLevelRepeatCols > kMaxBlackPattern   ||
				fSamplesPerPixel      < 1 || fSamplesPerPixel      > kMaxSamplesPerPixel)
				{
				return false;
				}

			for (j = 0; j < fBlackLevelRepeatRows; j++)
				for (k = 0; k < fBlackLevelRepeatCols; k++)
					for (n = 0; n < fSamplesPerPixel; n++)
						{

						fBlackLevel [j] [k] [n] = stream.TagValue_real64 (tagType);

						}

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("BlackLevel:");

				if (fBlackLevelRepeatRows == 1 &&
					fBlackLevelRepeatCols == 1)
					{

					for (n = 0; n < fSamplesPerPixel; n++)
						{
						printf (" %0.2f", fBlackLevel [0] [0] [n]);
						}

					printf ("\n");

					}

				else
					{

					printf ("\n");

					for (n = 0; n < fSamplesPerPixel; n++)
						{

						if (fSamplesPerPixel > 1)
							{
							printf ("    Sample: %u\n", (unsigned) n);
							}

						for (j = 0; j < fBlackLevelRepeatRows; j++)
							{

							printf ("   ");

							for (k = 0; k < fBlackLevelRepeatCols; k++)
								{

								printf (" %8.2f", fBlackLevel [j] [k] [n]);

								}

							printf ("\n");

							}

						}

					}

				}

			#endif

			break;

			}

		case tcBlackLevelDeltaH:
			{

			CheckRawIFD (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttSRational);

			fBlackLevelDeltaHType   = tagType;
			fBlackLevelDeltaHCount  = tagCount;
			fBlackLevelDeltaHOffset = tagOffset;

			#if qDNGValidate

			if (gVerbose)
				{

				DumpTagValues (stream,
							   "Delta",
							   parentCode,
							   tagCode,
							   tagType,
							   tagCount);

				}

			#endif

			break;

			}

		case tcBlackLevelDeltaV:
			{

			CheckRawIFD (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttSRational);

			fBlackLevelDeltaVType   = tagType;
			fBlackLevelDeltaVCount  = tagCount;
			fBlackLevelDeltaVOffset = tagOffset;

			#if qDNGValidate

			if (gVerbose)
				{

				DumpTagValues (stream,
							   "Delta",
							   parentCode,
							   tagCode,
							   tagType,
							   tagCount);

				}

			#endif

			break;

			}

		case tcWhiteLevel:
			{

			CheckRawIFD (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			if (!CheckTagCount (parentCode, tagCode, tagCount, fSamplesPerPixel))
				return false;

			for (j = 0; j < tagCount && j < kMaxSamplesPerPixel; j++)
				{

				fWhiteLevel [j] = stream.TagValue_real64 (tagType);

				}

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("WhiteLevel:");

				for (j = 0; j < tagCount && j < kMaxSamplesPerPixel; j++)
					{

					printf (" %0.0f", fWhiteLevel [j]);

					}

				printf ("\n");

				}

			#endif

			break;

			}

		case tcDefaultScale:
			{

			CheckMainIFD (parentCode, tagCode, fNewSubFileType);

			CheckTagType (parentCode, tagCode, tagType, ttRational);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 2))
				return false;

			fDefaultScaleH = stream.TagValue_urational (tagType);
			fDefaultScaleV = stream.TagValue_urational (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("DefaultScale: H = %0.4f V = %0.4f\n",
						fDefaultScaleH.As_real64 (),
						fDefaultScaleV.As_real64 ());

				}

			#endif

			break;

			}

		case tcDefaultCropOrigin:
			{

			CheckMainIFD (parentCode, tagCode, fNewSubFileType);

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong, ttRational);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 2))
				return false;

			fDefaultCropOriginH = stream.TagValue_urational (tagType);
			fDefaultCropOriginV = stream.TagValue_urational (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("DefaultCropOrigin: H = %0.2f V = %0.2f\n",
						fDefaultCropOriginH.As_real64 (),
						fDefaultCropOriginV.As_real64 ());

				}

			#endif

			break;

			}

		case tcDefaultCropSize:
			{

			CheckMainIFD (parentCode, tagCode, fNewSubFileType);

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong, ttRational);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 2))
				return false;

			fDefaultCropSizeH = stream.TagValue_urational (tagType);
			fDefaultCropSizeV = stream.TagValue_urational (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("DefaultCropSize: H = %0.2f V = %0.2f\n",
						fDefaultCropSizeH.As_real64 (),
						fDefaultCropSizeV.As_real64 ());

				}

			#endif

			break;

			}

		case tcBayerGreenSplit:
			{

			CheckCFA (parentCode, tagCode, fPhotometricInterpretation);

			CheckTagType (parentCode, tagCode, tagType, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fBayerGreenSplit = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{
				printf ("BayerGreenSplit: %u\n", (unsigned) fBayerGreenSplit);
				}

			#endif

			break;

			}

		case tcChromaBlurRadius:
			{

			CheckMainIFD (parentCode, tagCode, fNewSubFileType);

			CheckTagType (parentCode, tagCode, tagType, ttRational);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fChromaBlurRadius = stream.TagValue_urational (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("ChromaBlurRadius: %0.2f\n",
						fChromaBlurRadius.As_real64 ());

				}

			#endif

			break;

			}

		case tcAntiAliasStrength:
			{

			CheckMainIFD (parentCode, tagCode, fNewSubFileType);

			CheckTagType (parentCode, tagCode, tagType, ttRational);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fAntiAliasStrength = stream.TagValue_urational (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("AntiAliasStrength: %0.2f\n",
						fAntiAliasStrength.As_real64 ());

				}

			#endif

			break;

			}

		case tcBestQualityScale:
			{

			CheckMainIFD (parentCode, tagCode, fNewSubFileType);

			CheckTagType (parentCode, tagCode, tagType, ttRational);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fBestQualityScale = stream.TagValue_urational (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("BestQualityScale: %0.4f\n",
						fBestQualityScale.As_real64 ());

				}

			#endif

			break;

			}

		case tcActiveArea:
			{

			CheckMainIFD (parentCode, tagCode, fNewSubFileType);

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 4))
				return false;

			fActiveArea.t = stream.TagValue_int32 (tagType);
			fActiveArea.l = stream.TagValue_int32 (tagType);
			fActiveArea.b = stream.TagValue_int32 (tagType);
			fActiveArea.r = stream.TagValue_int32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("ActiveArea: T = %d L = %d B = %d R = %d\n",
						(int) fActiveArea.t,
						(int) fActiveArea.l,
						(int) fActiveArea.b,
						(int) fActiveArea.r);

				}

			#endif

			break;

			}

		case tcMaskedAreas:
			{

			CheckMainIFD (parentCode, tagCode, fNewSubFileType);

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			uint32 rect_count = tagCount / 4;

			if (!CheckTagCount (parentCode, tagCode, tagCount, rect_count * 4))
				return false;

			fMaskedAreaCount = rect_count;

			if (fMaskedAreaCount > kMaxMaskedAreas)
				fMaskedAreaCount = kMaxMaskedAreas;

			for (j = 0; j < fMaskedAreaCount; j++)
				{

				fMaskedArea [j].t = stream.TagValue_int32 (tagType);
				fMaskedArea [j].l = stream.TagValue_int32 (tagType);
				fMaskedArea [j].b = stream.TagValue_int32 (tagType);
				fMaskedArea [j].r = stream.TagValue_int32 (tagType);

				}

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("MaskedAreas: %u\n", (unsigned) fMaskedAreaCount);

				for (j = 0; j < fMaskedAreaCount; j++)
					{

					printf ("    Area [%u]: T = %d L = %d B = %d R = %d\n",
							(unsigned) j,
							(int) fMaskedArea [j].t,
							(int) fMaskedArea [j].l,
							(int) fMaskedArea [j].b,
							(int) fMaskedArea [j].r);

					}

				}

			#endif

			break;

			}

		case tcPreviewApplicationName:
			{

			CheckTagType (parentCode, tagCode, tagType, ttAscii, ttByte);

			ParseStringTag (stream,
							parentCode,
							tagCode,
							tagCount,
							fPreviewInfo.fApplicationName,
							false,
							false);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("PreviewApplicationName: ");

				DumpString (fPreviewInfo.fApplicationName);

				printf ("\n");

				}

			#endif

			break;

			}

		case tcPreviewApplicationVersion:
			{

			CheckTagType (parentCode, tagCode, tagType, ttAscii, ttByte);

			ParseStringTag (stream,
							parentCode,
							tagCode,
							tagCount,
							fPreviewInfo.fApplicationVersion,
							false,
							false);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("PreviewApplicationVersion: ");

				DumpString (fPreviewInfo.fApplicationVersion);

				printf ("\n");

				}

			#endif

			break;

			}

		case tcPreviewSettingsName:
			{

			CheckTagType (parentCode, tagCode, tagType, ttAscii, ttByte);

			ParseStringTag (stream,
							parentCode,
							tagCode,
							tagCount,
							fPreviewInfo.fSettingsName,
							false,
							false);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("PreviewSettingsName: ");

				DumpString (fPreviewInfo.fSettingsName);

				printf ("\n");

				}

			#endif

			break;

			}

		case tcPreviewSettingsDigest:
			{

			if (!CheckTagType (parentCode, tagCode, tagType, ttByte))
				return false;

			if (!CheckTagCount (parentCode, tagCode, tagCount, 16))
				return false;

			stream.Get (fPreviewInfo.fSettingsDigest.data, 16);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("PreviewSettingsDigest: ");

				DumpFingerprint (fPreviewInfo.fSettingsDigest);

				printf ("\n");

				}

			#endif

			break;

			}

		case tcPreviewColorSpace:
			{

			CheckTagType (parentCode, tagCode, tagType, ttLong);

			CheckTagCount (parentCode, tagCode, tagCount, 1);

			fPreviewInfo.fColorSpace = (PreviewColorSpaceEnum)
									   stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("PreviewColorSpace: %s\n",
						LookupPreviewColorSpace ((uint32) fPreviewInfo.fColorSpace));

				}

			#endif

			break;

			}

		case tcPreviewDateTime:
			{

			CheckTagType (parentCode, tagCode, tagType, ttAscii);

			ParseStringTag (stream,
							parentCode,
							tagCode,
							tagCount,
							fPreviewInfo.fDateTime,
							false,
							false);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("PreviewDateTime: ");

				DumpString (fPreviewInfo.fDateTime);

				printf ("\n");

				}

			#endif

			break;

			}

		case tcRowInterleaveFactor:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 1))
				return false;

			fRowInterleaveFactor = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("RowInterleaveFactor: %u\n",
						(unsigned) fRowInterleaveFactor);

				}

			#endif

			break;

			}

		case tcSubTileBlockSize:
			{

			CheckTagType (parentCode, tagCode, tagType, ttShort, ttLong);

			if (!CheckTagCount (parentCode, tagCode, tagCount, 2))
				return false;

			fSubTileBlockRows = stream.TagValue_uint32 (tagType);
			fSubTileBlockCols = stream.TagValue_uint32 (tagType);

			#if qDNGValidate

			if (gVerbose)
				{

				printf ("SubTileBlockSize: rows = %u, cols = %u\n",
						(unsigned) fSubTileBlockRows,
						(unsigned) fSubTileBlockCols);

				}

			#endif

			break;

			}

		default:
			{

			return false;

			}

		}

	return true;

	}

/*****************************************************************************/

void dng_ifd::PostParse ()
	{

	uint32 j;
	uint32 k;

	// There is only one PlanarConfiguration for single sample imaages.

	if (fSamplesPerPixel == 1)
		{
		fPlanarConfiguration = pcInterleaved;
		}

	// Default tile size.

	if (fTileWidth == 0)
		{
		fTileWidth = fImageWidth;
		}

	if (fTileLength == 0)
		{
		fTileLength = fImageLength;
		}

	// Default ActiveArea.

	dng_rect imageArea (0, 0, fImageLength, fImageWidth);

	if (fActiveArea.IsZero ())
		{
		fActiveArea = imageArea;
		}

	// Default crop size.

	if (fDefaultCropSizeH.d == 0)
		{
		fDefaultCropSizeH = dng_urational (fActiveArea.W (), 1);
		}

	if (fDefaultCropSizeV.d == 0)
		{
		fDefaultCropSizeV = dng_urational (fActiveArea.H (), 1);
		}

	// Default white level.

	uint32 defaultWhite = (1 << fBitsPerSample [0]) - 1;

	for (j = 0; j < kMaxSamplesPerPixel; j++)
		{

		if (fWhiteLevel [j] < 0.0)
			{
			fWhiteLevel [j] = (real64) defaultWhite;
			}

		}

	// Check AntiAliasStrength.

	if (fAntiAliasStrength.As_real64 () < 0.0 ||
		fAntiAliasStrength.As_real64 () > 1.0)
		{

		#if qDNGValidate

		ReportWarning ("Invalid AntiAliasStrength");

		#endif

		fAntiAliasStrength = dng_urational (1, 1);

		}

	// Check MaskedAreas.

	for (j = 0; j < fMaskedAreaCount; j++)
		{

		const dng_rect &r = fMaskedArea [j];

		if (r.IsEmpty () || ((r & imageArea) != r))
			{

			#if qDNGValidate

			ReportWarning ("Invalid MaskedArea");

			#endif

			fMaskedAreaCount = 0;

			break;

			}

		if ((r & fActiveArea).NotEmpty ())
			{

			#if qDNGValidate

			ReportWarning ("MaskedArea overlaps ActiveArea");

			#endif

			fMaskedAreaCount = 0;

			break;

			}

		for (k = 0; k < j; k++)
			{

			if ((r & fMaskedArea [k]).NotEmpty ())
				{

				#if qDNGValidate

				ReportWarning ("MaskedAreas overlap each other");

				#endif

				fMaskedAreaCount = 0;

				break;

				}

			}

		}

	}

/*****************************************************************************/

bool dng_ifd::IsValidCFA (dng_shared &shared,
						  uint32 parentCode)
	{

	uint32 j;
	uint32 k;
	uint32 n;

	#if !qDNGValidate

	(void) parentCode;			// Unused

	#endif

	if (fCFARepeatPatternRows < 1 || fCFARepeatPatternRows > kMaxCFAPattern ||
		fCFARepeatPatternCols < 1 || fCFARepeatPatternCols > kMaxCFAPattern)
		{

		#if qDNGValidate

		ReportError ("Missing or invalid CFAPatternRepeatDim",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	uint32 count [kMaxColorPlanes];

	for (n = 0; n < shared.fCameraProfile.fColorPlanes; n++)
		{
		count [n] = 0;
		}

	for (j = 0; j < fCFARepeatPatternRows; j++)
		{

		for (k = 0; k < fCFARepeatPatternCols; k++)
			{

			bool found = false;

			for (n = 0; n < shared.fCameraProfile.fColorPlanes; n++)
				{

				if (fCFAPattern [j] [k] == fCFAPlaneColor [n])
					{
					found = true;
					count [n] ++;
					break;
					}

				}

			if (!found)
				{

				#if qDNGValidate

				ReportError ("CFAPattern contains colors not included in the CFAPlaneColor tag",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			}

		}

	for (n = 0; n < shared.fCameraProfile.fColorPlanes; n++)
		{

		if (count [n] == 0)
			{

			#if qDNGValidate

			ReportError ("CFAPattern does not contain all the colors in the CFAPlaneColor tag",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	if (fCFALayout < 1 || fCFALayout > 9)
		{

		#if qDNGValidate

		ReportError ("Invalid CFALayout",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	return true;

	}

/*****************************************************************************/

bool dng_ifd::IsValidDNG (dng_shared &shared,
					      uint32 parentCode)
	{

	uint32 j;

	dng_rect imageArea (0, 0, fImageLength, fImageWidth);

	uint32 defaultWhite = (1 << fBitsPerSample [0]) - 1;

	bool isMonochrome = (shared.fCameraProfile.fColorPlanes == 1);
	bool isColor      = !isMonochrome;

	bool isMainIFD = (fNewSubFileType == sfMainImage);

	// Check NewSubFileType.

	if (!fUsesNewSubFileType)
		{

		#if qDNGValidate

		ReportError ("Missing NewSubFileType",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	if (fNewSubFileType != sfMainImage    &&
		fNewSubFileType != sfPreviewImage &&
		fNewSubFileType != sfAltPreviewImage)
		{

		#if qDNGValidate

		ReportError ("Unexpected NewSubFileType",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check ImageWidth and ImageLength.

	if (fImageWidth < 1)
		{

		#if qDNGValidate

		ReportError ("Missing or invalid ImageWidth",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	if (fImageLength < 1)
		{

		#if qDNGValidate

		ReportError ("Missing or invalid ImageLength",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	if (fImageWidth  > kMaxImageSide ||
		fImageLength > kMaxImageSide)
		{

		#if qDNGValidate

		ReportWarning ("Image size is larger than supported");

		#endif

		return false;

		}

	// Check PhotometricInterpretation.

	switch (fPhotometricInterpretation)
		{

		case piBlackIsZero:
		case piRGB:
		case piYCbCr:
			{

			if (isMainIFD)
				{

				#if qDNGValidate

				ReportError ("PhotometricInterpretation requires NewSubFileType = 1",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			break;

			}

		case piCFA:
			{

			if (!isMainIFD)
				{

				#if qDNGValidate

				ReportError ("PhotometricInterpretation requires NewSubFileType = 0",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			break;

			}

		case piLinearRaw:
			break;

		default:
			{

			#if qDNGValidate

			ReportError ("Missing or invalid PhotometricInterpretation",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	switch (fPhotometricInterpretation)
		{

		case piBlackIsZero:
			{

			if (isColor)
				{

				#if qDNGValidate

				ReportError ("PhotometricInterpretation forbids use of ColorMatrix1 tag",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			break;

			}

		case piRGB:
		case piYCbCr:
			{

			// Allow color previews even in monochrome DNG files, since the
			// raw procesing software may be adding color effects.

			break;

			}

		case piCFA:
			{

			if (isMonochrome)
				{

				#if qDNGValidate

				ReportError ("PhotometricInterpretation requires use of ColorMatrix1 tag",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			break;

			}

		}

	// Check SamplesPerPixel and BitsPerSample.

	uint32 minSamplesPerPixel = 1;
	uint32 maxSamplesPerPixel = 1;

	uint32 minBitsPerSample = 8;
	uint32 maxBitsPerSample = 16;

	switch (fPhotometricInterpretation)
		{

		case piBlackIsZero:
			break;

		case piRGB:
		case piYCbCr:
			{
			minSamplesPerPixel = 3;
			maxSamplesPerPixel = 3;
			break;
			}

		case piCFA:
			{
			maxSamplesPerPixel = kMaxSamplesPerPixel;
			maxBitsPerSample   = 32;
			break;
			}

		case piLinearRaw:
			{
			minSamplesPerPixel = shared.fCameraProfile.fColorPlanes;
			maxSamplesPerPixel = shared.fCameraProfile.fColorPlanes;
			maxBitsPerSample   = 32;
			break;
			}

		}

	if (fSamplesPerPixel < minSamplesPerPixel ||
		fSamplesPerPixel > maxSamplesPerPixel)
		{

		#if qDNGValidate

		ReportError ("Missing or invalid SamplesPerPixel",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	for (j = 0; j < kMaxSamplesPerPixel; j++)
		{

		if (j < fSamplesPerPixel)
			{

			if (fBitsPerSample [j] < minBitsPerSample ||
				fBitsPerSample [j] > maxBitsPerSample)
				{

				#if qDNGValidate

				ReportError ("Missing or invalid BitsPerSample",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			if (minBitsPerSample   ==  8 &&
				maxBitsPerSample   == 16 &&
				fBitsPerSample [j] !=  8 &&
				fBitsPerSample [j] != 16)
				{

				#if qDNGValidate

				ReportError ("Rendered previews require 8 or 16 bits per sample",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			if (j > 0 && fBitsPerSample [j] != fBitsPerSample [0])
				{

				#if qDNGValidate

				ReportError ("BitsPerSample not equal for all samples",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			}

		else
			{

			if (fBitsPerSample [j] != 0)
				{

				#if qDNGValidate

				ReportError ("Too many values specified in BitsPerSample",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			}

		}

	// Check Compression.

	switch (fCompression)
		{

		case ccUncompressed:
			break;

		case ccJPEG:
			{

			if (fPhotometricInterpretation == piRGB)
				{

				#if qDNGValidate

				ReportError ("JPEG previews should use PhotometricInterpretation = YCbYb",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			if (fBitsPerSample [0] > 16)
				{

				#if qDNGValidate

				ReportError ("JPEG compression is limited to 16 bits/sample",
							 LookupParentCode (parentCode));

				#endif

				return false;

				}

			break;

			}

		default:
			{

			#if qDNGValidate

			ReportError ("Unsupported Compression",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	// Check Predictor.

	if (fPredictor != cpNullPredictor)
		{

		#if qDNGValidate

		ReportError ("Unsupported Predictor",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check FillOrder.

	if (fFillOrder != 1)
		{

		#if qDNGValidate

		ReportError ("Unsupported FillOrder",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check PlanarConfiguration.

	if (fPlanarConfiguration != pcInterleaved)
		{

		#if qDNGValidate

		ReportError ("Unsupported PlanarConfiguration",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check ExtraSamples.

	if (fExtraSamplesCount != 0)
		{

		#if qDNGValidate

		ReportError ("Unsupported ExtraSamples",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check SampleFormat.

	for (j = 0; j < fSamplesPerPixel; j++)
		{

		if (fSampleFormat [j] != sfUnsignedInteger)
			{

			#if qDNGValidate

			ReportError ("Unsupported SampleFormat",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	// Check Orientation.

	if (fOrientation > 9)
		{

		#if qDNGValidate

		ReportError ("Unknown Orientation",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	#if qDNGValidate

	if (fOrientation != 0 && parentCode != 0)
		{

		ReportWarning ("Unexpected Orientation tag",
					   LookupParentCode (parentCode));

		}

	if (fOrientation == 0 && parentCode == 0)
		{

		ReportWarning ("Missing Orientation tag",
					   LookupParentCode (parentCode));

		}

	#endif

	// Check Strips vs. Tiles.

	if (!fUsesStrips && !fUsesTiles)
		{

		#if qDNGValidate

		ReportError ("IFD uses neither strips nor tiles",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	if (fUsesStrips && fUsesTiles)
		{

		#if qDNGValidate

		ReportError ("IFD uses both strips and tiles",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check tile info.

	uint32 tilesWide = (fImageWidth  + fTileWidth  - 1) / fTileWidth;
	uint32 tilesHigh = (fImageLength + fTileLength - 1) / fTileLength;

	uint32 tileCount = tilesWide * tilesHigh;

	if (fTileOffsetsCount != tileCount)
		{

		#if qDNGValidate

		ReportError ("Missing or invalid Strip/TileOffsets",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	if (fTileByteCountsCount != tileCount)
		{

		#if qDNGValidate

		ReportError ("Missing or invalid Strip/TileByteCounts",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check CFA pattern.

	if (fPhotometricInterpretation == piCFA)
		{

		if (!IsValidCFA (shared, parentCode))
			{

			return false;

			}

		}

	// Check ActiveArea.

	if (((fActiveArea & imageArea) != fActiveArea) || fActiveArea.IsEmpty ())
		{

		#if qDNGValidate

		ReportError ("Invalid ActiveArea",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	if (fActiveArea != imageArea)
		{

		if (shared.fDNGBackwardVersion < 0x01010000)
			{

			#if qDNGValidate

			ReportError ("Non-default ActiveArea tag not allowed in this DNG version",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	// Check LinearizationTable.

	if (fLinearizationTableCount)
		{

		if (fLinearizationTableType != ttShort)
			{

			#if qDNGValidate

			ReportError ("Invalidate LinearizationTable type",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		if (fLinearizationTableCount < 2 ||
			fLinearizationTableCount > 65536)
			{

			#if qDNGValidate

			ReportError ("Invalidate LinearizationTable count",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	// Check BlackLevelRepeatDim.

	if (fBlackLevelRepeatRows < 1 || fBlackLevelRepeatRows > kMaxBlackPattern ||
		fBlackLevelRepeatCols < 1 || fBlackLevelRepeatCols > kMaxBlackPattern)
		{

		#if qDNGValidate

		ReportError ("Invalid BlackLevelRepeatDim",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check BlackLevelDeltaH.

	if (fBlackLevelDeltaHCount != 0 &&
		fBlackLevelDeltaHCount != fActiveArea.W ())
		{

		#if qDNGValidate

		ReportError ("Invalid BlackLevelDeltaH count",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check BlackLevelDeltaV.

	if (fBlackLevelDeltaVCount != 0 &&
		fBlackLevelDeltaVCount != fActiveArea.H ())
		{

		#if qDNGValidate

		ReportError ("Invalid BlackLevelDeltaV count",
					 LookupParentCode (parentCode));

		#endif

		return false;

		}

	// Check WhiteLevel.

	real64 maxWhite = fLinearizationTableCount ? 65535.0
											   : (real64) defaultWhite;

	for (j = 0; j < fSamplesPerPixel; j++)
		{

		if (fWhiteLevel [j] < 1.0 ||
			fWhiteLevel [j] > maxWhite)
			{

			#if qDNGValidate

			ReportError ("Invalid WhiteLevel",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	// Check DefaultScale.

	if (fDefaultScaleH.As_real64 () <= 0.0 ||
		fDefaultScaleV.As_real64 () <= 0.0)
		{

		#if qDNGValidate

		ReportError ("Invalid DefaultScale");

		#endif

		return false;

		}

	// Check BestQualityScale.

	if (fBestQualityScale.As_real64 () < 1.0)
		{

		#if qDNGValidate

		ReportError ("Invalid BestQualityScale");

		#endif

		return false;

		}

	// Check DefaultCropOrigin.

	if (fDefaultCropOriginH.As_real64 () < 0.0 ||
		fDefaultCropOriginV.As_real64 () < 0.0 ||
		fDefaultCropOriginH.As_real64 () >= (real64) fActiveArea.W () ||
		fDefaultCropOriginV.As_real64 () >= (real64) fActiveArea.H ())
		{

		#if qDNGValidate

		ReportError ("Invalid DefaultCropOrigin");

		#endif

		return false;

		}

	// Check DefaultCropSize.

	if (fDefaultCropSizeH.As_real64 () <= 0.0 					   ||
		fDefaultCropSizeV.As_real64 () <= 0.0 					   ||
		fDefaultCropSizeH.As_real64 () > (real64) fActiveArea.W () ||
		fDefaultCropSizeV.As_real64 () > (real64) fActiveArea.H ())
		{

		#if qDNGValidate

		ReportError ("Invalid DefaultCropSize");

		#endif

		return false;

		}

	// Check DefaultCrop area.

	if (fDefaultCropOriginH.As_real64 () +
		fDefaultCropSizeH  .As_real64 () > (real64) fActiveArea.W () ||
		fDefaultCropOriginV.As_real64 () +
		fDefaultCropSizeV  .As_real64 () > (real64) fActiveArea.H ())
		{

		#if qDNGValidate

		ReportError ("Default crop extends outside ActiveArea");

		#endif

		return false;

		}

	// Warning if too little padding on CFA image.

	#if qDNGValidate

	if (fPhotometricInterpretation == piCFA)
		{

		const real64 kMinPad = 1.9;

		if (fDefaultCropOriginH.As_real64 () < kMinPad)
			{

			ReportWarning ("Too little padding on left edge of CFA image",
						   "possible interpolation artifacts");

			}

		if (fDefaultCropOriginV.As_real64 () < kMinPad)
			{

			ReportWarning ("Too little padding on top edge of CFA image",
						   "possible interpolation artifacts");

			}

		if (fDefaultCropOriginH.As_real64 () +
			fDefaultCropSizeH  .As_real64 () > (real64) fActiveArea.W () - kMinPad)
			{

			ReportWarning ("Too little padding on right edge of CFA image",
						   "possible interpolation artifacts");

			}

		if (fDefaultCropOriginV.As_real64 () +
			fDefaultCropSizeV  .As_real64 () > (real64) fActiveArea.H () - kMinPad)
			{

			ReportWarning ("Too little padding on bottom edge of CFA image",
						   "possible interpolation artifacts");

			}

		}

	#endif

	// Check RowInterleaveFactor

	if (fRowInterleaveFactor != 1)
		{

		if (fRowInterleaveFactor < 1 ||
			fRowInterleaveFactor > fImageLength)
			{

			#if qDNGValidate

			ReportError ("RowInterleaveFactor out of valid range",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		if (shared.fDNGBackwardVersion < 0x01020000)
			{

			#if qDNGValidate

			ReportError ("Non-default RowInterleaveFactor tag not allowed in this DNG version",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	// Check SubTileBlockSize

	if (fSubTileBlockRows != 1 || fSubTileBlockCols != 1)
		{

		if (fSubTileBlockRows < 2 || fSubTileBlockRows > fTileLength ||
			fSubTileBlockCols < 1 || fSubTileBlockCols > fTileWidth)
			{

			#if qDNGValidate

			ReportError ("SubTileBlockSize out of valid range",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		if ((fTileLength % fSubTileBlockRows) != 0 ||
			(fTileWidth  % fSubTileBlockCols) != 0)
			{

			#if qDNGValidate

			ReportError ("TileSize not exact multiple of SubTileBlockSize",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		if (shared.fDNGBackwardVersion < 0x01020000)
			{

			#if qDNGValidate

			ReportError ("Non-default SubTileBlockSize tag not allowed in this DNG version",
						 LookupParentCode (parentCode));

			#endif

			return false;

			}

		}

	return true;

	}

/*****************************************************************************/

uint32 dng_ifd::TilesAcross () const
	{

	if (fTileWidth)
		{

		return (fImageWidth + fTileWidth - 1) / fTileWidth;

		}

	return 0;

	}

/*****************************************************************************/

uint32 dng_ifd::TilesDown () const
	{

	if (fTileLength)
		{

		return (fImageLength + fTileLength - 1) / fTileLength;

		}

	return 0;

	}

/*****************************************************************************/

uint32 dng_ifd::TilesPerImage () const
	{

	uint32 total = TilesAcross () * TilesDown ();

	if (fPlanarConfiguration == pcPlanar)
		{

		total *= fSamplesPerPixel;

		}

	return total;

	}

/*****************************************************************************/

dng_rect dng_ifd::TileArea (uint32 rowIndex,
						    uint32 colIndex) const
	{

	dng_rect r;

	r.t = rowIndex * fTileLength;
	r.b = r.t      + fTileLength;

	r.l = colIndex * fTileWidth;
	r.r = r.l      + fTileWidth;

	// If this IFD is using strips rather than tiles, the last strip
	// is trimmed so it does not extend beyond the end of the image.

	if (fUsesStrips)
		{

		r.b = Min_uint32 (r.b, fImageLength);

		}

	return r;

	}

/*****************************************************************************/

uint32 dng_ifd::TileByteCount (const dng_rect &tile) const
	{

	if (fCompression == ccUncompressed)
		{

		uint32 bitsPerRow = tile.W () *
							fBitsPerSample [0];

		if (fPlanarConfiguration == pcInterleaved)
			{

			bitsPerRow *= fSamplesPerPixel;

			}

		uint32 bytesPerRow = (bitsPerRow + 7) >> 3;

		if (fPlanarConfiguration == pcRowInterleaved)
			{

			bytesPerRow *= fSamplesPerPixel;

			}

		return bytesPerRow * tile.H ();

		}

	return 0;

	}

/*****************************************************************************/

void dng_ifd::SetSingleStrip ()
	{

	fTileWidth  = fImageWidth;
	fTileLength = fImageLength;

	fUsesTiles  = false;
	fUsesStrips = true;

	}

/*****************************************************************************/

void dng_ifd::FindTileSize (uint32 bytesPerTile,
						    uint32 cellH,
						    uint32 cellV)
	{

	uint32 bytesPerSample = fSamplesPerPixel *
							((fBitsPerSample [0] + 7) >> 3);

	uint32 samplesPerTile = bytesPerTile / bytesPerSample;

	uint32 tileSide = Round_uint32 (sqrt ((real64) samplesPerTile));

	fTileWidth = Min_uint32 (fImageWidth, tileSide);

	uint32 across = TilesAcross ();

	fTileWidth = (fImageWidth + across - 1) / across;

	fTileWidth = ((fTileWidth + cellH - 1) / cellH) * cellH;

	fTileLength = Pin_uint32 (1,
						      samplesPerTile / fTileWidth,
						      fImageLength);

	uint32 down = TilesDown ();

	fTileLength = (fImageLength + down - 1) / down;

	fTileLength = ((fTileLength + cellV - 1) / cellV) * cellV;

	fUsesTiles  = true;
	fUsesStrips = false;

	}

/*****************************************************************************/

void dng_ifd::FindStripSize (uint32 bytesPerStrip,
						     uint32 cellV)
	{

	uint32 bytesPerSample = fSamplesPerPixel *
							((fBitsPerSample [0] + 7) >> 3);

	uint32 samplesPerStrip = bytesPerStrip / bytesPerSample;

	fTileWidth = fImageWidth;

	fTileLength = Pin_uint32 (1,
						      samplesPerStrip / fTileWidth,
						      fImageLength);

	uint32 down = TilesDown ();

	fTileLength = (fImageLength + down - 1) / down;

	fTileLength = ((fTileLength + cellV - 1) / cellV) * cellV;

	fUsesTiles  = false;
	fUsesStrips = true;

	}

/*****************************************************************************/

uint32 dng_ifd::PixelType () const
	{

	if (fSampleFormat [0] == sfFloatingPoint)
		{
		return ttFloat;
		}

	if (fBitsPerSample [0] <= 8)
		{
		return ttByte;
		}

	else if (fBitsPerSample [0] <= 16)
		{
		return ttShort;
		}

	return ttLong;

	}

/*****************************************************************************/

bool dng_ifd::IsBaselineJPEG () const
	{

	if (fCompression != ccJPEG)
		{
		return false;
		}

	if (fBitsPerSample [0] != 8)
		{
		return false;
		}

	if (fSampleFormat [0] != sfUnsignedInteger)
		{
		return false;
		}

	switch (fPhotometricInterpretation)
		{

		case piBlackIsZero:
			{
			return (fSamplesPerPixel == 1);
			}

		case piYCbCr:
			{
			return (fSamplesPerPixel     == 3            ) &&
				   (fPlanarConfiguration == pcInterleaved);
			}

		default:
			break;

		}

	return false;

	}

/*****************************************************************************/

bool dng_ifd::CanRead () const
	{

	dng_read_image reader;

	return reader.CanRead (*this);

	}

/*****************************************************************************/

void dng_ifd::ReadImage (dng_host &host,
						 dng_stream &stream,
						 dng_image &image) const
	{

	dng_read_image reader;

	reader.Read (host,
				 *this,
				 stream,
				 image);

	}

/*****************************************************************************/
