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src/Source/FreeImageToolkit/Colors.cpp  view on Meta::CPAN

// ==========================================================
// Color manipulation routines
//
// Design and implementation by
// - Hervé Drolon (drolon@infonie.fr)
// - Carsten Klein (c.klein@datagis.com)
// - Mihail Naydenov (mnaydenov@users.sourceforge.net)
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================

#include "FreeImage.h"
#include "Utilities.h"

// ----------------------------------------------------------
//   Macros + structures
// ----------------------------------------------------------

#define GET_HI_NIBBLE(byte)     ((byte) >> 4)
#define SET_HI_NIBBLE(byte, n)  byte &= 0x0F, byte |= ((n) << 4)
#define GET_LO_NIBBLE(byte)     ((byte) & 0x0F)
#define SET_LO_NIBBLE(byte, n)  byte &= 0xF0, byte |= ((n) & 0x0F)
#define GET_NIBBLE(cn, byte)    ((cn) ? (GET_HI_NIBBLE(byte)) : (GET_LO_NIBBLE(byte))) 
#define SET_NIBBLE(cn, byte, n) if (cn) SET_HI_NIBBLE(byte, n); else SET_LO_NIBBLE(byte, n) 

// ----------------------------------------------------------


/** @brief Inverts each pixel data.

@param src Input image to be processed.
@return Returns TRUE if successful, FALSE otherwise.
*/
BOOL DLL_CALLCONV 
FreeImage_Invert(FIBITMAP *src) {

	if (!FreeImage_HasPixels(src)) return FALSE;
	
	unsigned i, x, y, k;
	
	const unsigned width = FreeImage_GetWidth(src);
	const unsigned height = FreeImage_GetHeight(src);
	const unsigned bpp = FreeImage_GetBPP(src);

	FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(src);

	if(image_type == FIT_BITMAP) {
		switch(bpp) {
			case 1 :
			case 4 :
			case 8 :
			{
				// if the dib has a colormap, just invert it
				// else, keep the linear grayscale

				if (FreeImage_GetColorType(src) == FIC_PALETTE) {
					RGBQUAD *pal = FreeImage_GetPalette(src);

					for(i = 0; i < FreeImage_GetColorsUsed(src); i++) {
						pal[i].rgbRed	= 255 - pal[i].rgbRed;
						pal[i].rgbGreen = 255 - pal[i].rgbGreen;
						pal[i].rgbBlue	= 255 - pal[i].rgbBlue;
					}
				} else {
					for(y = 0; y < height; y++) {
						BYTE *bits = FreeImage_GetScanLine(src, y);

						for (x = 0; x < FreeImage_GetLine(src); x++) {
							bits[x] = ~bits[x];
						}
					}
				}

				break;
			}