C++ (Cpp) FreeImage_GetComplexChannel Examples

Example #1

/** Convert image of any type to a standard 8-bit greyscale image.
For standard images, a clone of the input image is returned.
When the scale_linear parameter is TRUE, conversion is done by scaling linearly 
each pixel to an integer value between [0..255]. When it is FALSE, conversion is done 
by rounding each float pixel to an integer between [0..255]. 
For complex images, the magnitude is extracted as a double image, then converted according to the scale parameter. 
@param image Image to convert
@param scale_linear Linear scaling / rounding switch
*/
FIBITMAP* DLL_CALLCONV
FreeImage_ConvertToStandardType(FIBITMAP *src, BOOL scale_linear) {
	FIBITMAP *dst = NULL;

	if(!src) return NULL;

	// convert from src_type to FIT_BITMAP

	const FREE_IMAGE_TYPE src_type = FreeImage_GetImageType(src);

	switch(src_type) {
		case FIT_BITMAP:	// standard image: 1-, 4-, 8-, 16-, 24-, 32-bit
			dst = FreeImage_Clone(src);
			break;
		case FIT_UINT16:	// array of unsigned short: unsigned 16-bit
			dst = convertUShortToByte.convert(src, scale_linear);
			break;
		case FIT_INT16:		// array of short: signed 16-bit
			dst = convertShortToByte.convert(src, scale_linear);
			break;
		case FIT_UINT32:	// array of unsigned long: unsigned 32-bit
			dst = convertULongToByte.convert(src, scale_linear);
			break;
		case FIT_INT32:		// array of long: signed 32-bit
			dst = convertLongToByte.convert(src, scale_linear);
			break;
		case FIT_FLOAT:		// array of float: 32-bit
			dst = convertFloatToByte.convert(src, scale_linear);
			break;
		case FIT_DOUBLE:	// array of double: 64-bit
			dst = convertDoubleToByte.convert(src, scale_linear);
			break;
		case FIT_COMPLEX:	// array of FICOMPLEX: 2 x 64-bit
			{
				// Convert to type FIT_DOUBLE
				FIBITMAP *dib_double = FreeImage_GetComplexChannel(src, FICC_MAG);
				if(dib_double) {
					// Convert to a standard bitmap (linear scaling)
					dst = convertDoubleToByte.convert(dib_double, scale_linear);
					// Free image of type FIT_DOUBLE
					FreeImage_Unload(dib_double);
				}
			}
			break;
		case FIT_RGB16:		// 48-bit RGB image: 3 x 16-bit
			break;
		case FIT_RGBA16:	// 64-bit RGBA image: 4 x 16-bit
			break;
		case FIT_RGBF:		// 96-bit RGB float image: 3 x 32-bit IEEE floating point
			break;
		case FIT_RGBAF:		// 128-bit RGBA float image: 4 x 32-bit IEEE floating point
			break;
	}

	if(NULL == dst) {
		FreeImage_OutputMessageProc(FIF_UNKNOWN, "FREE_IMAGE_TYPE: Unable to convert from type %d to type %d.\n No such conversion exists.", src_type, FIT_BITMAP);
	}
	
	return dst;
}

Example #2

void fipWinImage::drawEx(HDC hDC, RECT& rcDest, BOOL useFileBkg, RGBQUAD *appBkColor, FIBITMAP *bg) const {
	// Convert to a standard bitmap if needed
	if(_bHasChanged) {
		if(_bDeleteMe) {
			FreeImage_Unload(_display_dib);
			_display_dib = NULL;
			_bDeleteMe = FALSE;
		}

		FREE_IMAGE_TYPE image_type = getImageType();
		if(image_type == FIT_BITMAP) {
			BOOL bHasBackground = FreeImage_HasBackgroundColor(_dib);
			BOOL bIsTransparent = FreeImage_IsTransparent(_dib);

			if(!bIsTransparent && (!bHasBackground || !useFileBkg)) {
				// Copy pointer
				_display_dib = _dib;
			}
			else {
				// Create the transparent / alpha blended image
				_display_dib = FreeImage_Composite(_dib, useFileBkg, appBkColor, bg);
				if(_display_dib) {
					// Remember to delete _display_dib
					_bDeleteMe = TRUE;
				} else {
					// Something failed: copy pointers
					_display_dib = _dib;
				}
			}
		} else {
			// Convert to a standard dib for display

			if(image_type == FIT_COMPLEX) {
				// Convert to type FIT_DOUBLE
				FIBITMAP *dib_double = FreeImage_GetComplexChannel(_dib, FICC_MAG);
				// Convert to a standard bitmap (linear scaling)
				_display_dib = FreeImage_ConvertToStandardType(dib_double, TRUE);
				// Free image of type FIT_DOUBLE
				FreeImage_Unload(dib_double);
			} else if((image_type == FIT_RGBF) || (image_type == FIT_RGB16)) {
				// Apply a tone mapping algorithm and convert to 24-bit 
				_display_dib = FreeImage_ToneMapping(_dib, _tmo, _tmo_param_1, _tmo_param_2);
			} else if(image_type == FIT_RGBA16) {
				// Convert to 32-bit
				FIBITMAP *dib32 = FreeImage_ConvertTo32Bits(_dib);
				if(dib32) {
					// Create the transparent / alpha blended image
					_display_dib = FreeImage_Composite(dib32, useFileBkg, appBkColor, bg);
					FreeImage_Unload(dib32);
				}
			} else {
				// Other cases: convert to a standard bitmap (linear scaling)
				_display_dib = FreeImage_ConvertToStandardType(_dib, TRUE);
			}
			// Remember to delete _display_dib
			_bDeleteMe = TRUE;
		}

		_bHasChanged = FALSE;
	}

	// Draw the dib
	SetStretchBltMode(hDC, COLORONCOLOR);	
	StretchDIBits(hDC, rcDest.left, rcDest.top, 
		rcDest.right-rcDest.left, rcDest.bottom-rcDest.top, 
		0, 0, FreeImage_GetWidth(_display_dib), FreeImage_GetHeight(_display_dib),
		FreeImage_GetBits(_display_dib), FreeImage_GetInfo(_display_dib), DIB_RGB_COLORS, SRCCOPY);

}