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src/Source/FreeImage/PluginTIFF.cpp  view on Meta::CPAN

			break;
		case 8:
			return TRUE;
		case 16:
			if(photometric != PHOTOMETRIC_PALETTE) { 
				return TRUE;
			} else {
				return FALSE;
			}
			break;
		case 32:
			if((photometric == PHOTOMETRIC_MINISWHITE) || (photometric == PHOTOMETRIC_MINISBLACK) || (photometric == PHOTOMETRIC_LOGLUV)) { 
				return TRUE;
			} else {
				return FALSE;
			}
			break;
		case 64:
		case 128:
			if(photometric == PHOTOMETRIC_MINISBLACK) { 
				return TRUE;
			} else {
				return FALSE;
			}
			break;
		default:
			return FALSE;
	}
}

static TIFFLoadMethod  
FindLoadMethod(TIFF *tif, FREE_IMAGE_TYPE image_type, int flags) {
	uint16 bitspersample	= (uint16)-1;
	uint16 samplesperpixel	= (uint16)-1;
	uint16 photometric		= (uint16)-1;
	uint16 planar_config	= (uint16)-1;

	TIFFLoadMethod loadMethod = LoadAsGenericStrip;

	TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &photometric);
	TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel);
	TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bitspersample);
	TIFFGetFieldDefaulted(tif, TIFFTAG_PLANARCONFIG, &planar_config);

	BOOL bIsTiled = (TIFFIsTiled(tif) == 0) ? FALSE:TRUE;

	switch(photometric) {
		// convert to 24 or 32 bits RGB if the image is full color
		case PHOTOMETRIC_RGB:
			if((image_type == FIT_RGB16) || (image_type == FIT_RGBA16)) {
				// load 48-bit RGB and 64-bit RGBA without conversion 
				loadMethod = LoadAsGenericStrip;
			} 
			else if(image_type == FIT_RGBF) {
				if((samplesperpixel == 3) && (bitspersample == 16)) {
					// load 3 x 16-bit half as RGBF
					loadMethod = LoadAsHalfFloat;
				}
			}
			break;
		case PHOTOMETRIC_YCBCR:
		case PHOTOMETRIC_CIELAB:
		case PHOTOMETRIC_ICCLAB:
		case PHOTOMETRIC_ITULAB:
			loadMethod = LoadAsRBGA;
			break;
		case PHOTOMETRIC_LOGLUV:
			loadMethod = LoadAsLogLuv;
			break;
		case PHOTOMETRIC_SEPARATED:
			// if image is PHOTOMETRIC_SEPARATED _and_ comes with an ICC profile, 
			// then the image should preserve its original (CMYK) colour model and 
			// should be read as CMYK (to keep the match of pixel and profile and 
			// to avoid multiple conversions. Conversion can be done by changing 
			// the profile from it's original CMYK to an RGB profile with an 
			// apropriate color management system. Works with non-tiled TIFFs.
			if(!bIsTiled) {
				loadMethod = LoadAsCMYK;
			}
			break;
		case PHOTOMETRIC_MINISWHITE:
		case PHOTOMETRIC_MINISBLACK:
		case PHOTOMETRIC_PALETTE:
			// When samplesperpixel = 2 and bitspersample = 8, set the image as a
			// 8-bit indexed image + 8-bit alpha layer image
			// and convert to a 8-bit image with a transparency table
			if((samplesperpixel > 1) && (bitspersample == 8)) {
				loadMethod = LoadAs8BitTrns;
			} else {
				loadMethod = LoadAsGenericStrip;
			}
			break;
		default:
			loadMethod = LoadAsGenericStrip;
			break;
	}

	if((loadMethod == LoadAsGenericStrip) && bIsTiled) {
		loadMethod = LoadAsTiled;
	}

	return loadMethod;
}

// ==========================================================
// TIFF thumbnail routines
// ==========================================================

static FIBITMAP * DLL_CALLCONV
Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data);

/**
Read embedded thumbnail
*/
static void 
ReadThumbnail(FreeImageIO *io, fi_handle handle, void *data, TIFF *tiff, FIBITMAP *dib) {
	FIBITMAP* thumbnail = NULL;

	// read exif thumbnail (IFD 1) ...

	uint32 exif_offset = 0;