C++ FreeImage_GetPalette函數代碼示例

FIBITMAP * CreateTemplete(FIBITMAP * hImage, unsigned ScreenWidth, unsigned ScreenHeight) // 創建空白PNG模版
{
	FIBITMAP * hPicTemplete;
	RGBQUAD * palMain ;
	RGBQUAD * palTemplete ;
	unsigned ImgPitchLocal ;
	BYTE * pBitLocal;
	unsigned x, y, n;

	hPicTemplete = FreeImage_Allocate(ScreenWidth, ScreenHeight, 8, 0, 0, 0);  //創建目標圖像
	palMain = FreeImage_GetPalette(hImage);
	palTemplete = FreeImage_GetPalette(hPicTemplete);
	for (n = 0 ; n < 256 ; n++) {
		palTemplete[n].rgbRed = palMain[n].rgbRed ;
		palTemplete[n].rgbGreen = palMain[n].rgbGreen ;
		palTemplete[n].rgbBlue = palMain[n].rgbBlue ;
	}
	palTemplete[70].rgbRed = 255   ;
	palTemplete[70].rgbGreen = 255 ;
	palTemplete[70].rgbBlue = 255  ;
//	FreeImage_SetTransparent(hPicTemplete, false);
	// 所有像素顏色填充為 70 號索引
	ImgPitchLocal = FreeImage_GetPitch(hPicTemplete) ;
	pBitLocal = FreeImage_GetBits(hPicTemplete);
	for (y = 0 ; y < ScreenHeight; y++) {
		for (x = 0; x < ScreenWidth ; x++)
			pBitLocal[x] = 70 ;
		pBitLocal += ImgPitchLocal ; // 下一行
	}
	return hPicTemplete;
}

	bool readImage(SImage& image, MemChunk& data, int index)
	{
		// Get image info
		SImage::info_t info;
		FIBITMAP*      bm = getFIInfo(data, info);

		// Check it created/read ok
		if (!bm)
		{
			Global::error = "Unable to read image data (unsupported format?)";
			return false;
		}

		// Get image palette if it exists
		RGBQUAD* bm_pal = FreeImage_GetPalette(bm);
		Palette  palette;
		if (bm_pal)
		{
			int a = 0;
			int b = FreeImage_GetColorsUsed(bm);
			if (b > 256)
				b = 256;
			for (; a < b; a++)
				palette.setColour(a, rgba_t(bm_pal[a].rgbRed, bm_pal[a].rgbGreen, bm_pal[a].rgbBlue, 255));
		}

		// Create image
		if (info.has_palette)
			image.create(info, &palette);
		else
			image.create(info);
		uint8_t* img_data = imageData(image);

		// Convert to 32bpp & flip vertically
		FIBITMAP* rgba = FreeImage_ConvertTo32Bits(bm);
		if (!rgba)
		{
			LOG_MESSAGE(1, "FreeImage_ConvertTo32Bits failed for image data");
			Global::error = "Error reading PNG data";
			return false;
		}
		FreeImage_FlipVertical(rgba);

		// Load raw RGBA data
		uint8_t* bits_rgba = FreeImage_GetBits(rgba);
		int      c         = 0;
		for (int a = 0; a < info.width * info.height; a++)
		{
			img_data[c++] = bits_rgba[a * 4 + 2]; // Red
			img_data[c++] = bits_rgba[a * 4 + 1]; // Green
			img_data[c++] = bits_rgba[a * 4];     // Blue
			img_data[c++] = bits_rgba[a * 4 + 3]; // Alpha
		}

		// Free memory
		FreeImage_Unload(rgba);
		FreeImage_Unload(bm);

		return true;
	}

// 獨立函數，讀取gif圖片，寫白背景，轉為PNG並寫入緩存，返回緩存地址
FOX_DLL FIMEMORY * gif2png_bufopen(char *gifpath, BYTE ** buffpointeraddr, DWORD * bufflenaddr)
{
	FIBITMAP * hImage ;
	RGBQUAD * pal ;
	FIMEMORY * hMemory = NULL ;
	BYTE *mem_buffer = NULL ;
	DWORD size_in_bytes = 0 ;

	hImage = FreeImage_Load(FIF_GIF, gifpath, 0);

	pal = FreeImage_GetPalette(hImage);
	pal[70].rgbRed = 255 ;
	pal[70].rgbGreen = 255 ;
	pal[70].rgbBlue = 255 ;
	FreeImage_SetTransparent(hImage, false);

	hMemory = FreeImage_OpenMemory() ;
	FreeImage_SaveToMemory(FIF_PNG, hImage, hMemory, PNG_DEFAULT) ;
	FreeImage_Unload(hImage) ;

	FreeImage_AcquireMemory(hMemory, &mem_buffer, &size_in_bytes);
	*buffpointeraddr = mem_buffer ;
	*bufflenaddr = size_in_bytes ;
	
	return hMemory ;
//	FreeImage_CloseMemory(hMemory) ; // 使用完緩存記得要釋放
}

BOOL DLL_CALLCONV
FreeImage_GetBackgroundColor(FIBITMAP *dib, RGBQUAD *bkcolor) {
	if(dib && bkcolor) {
		if(FreeImage_HasBackgroundColor(dib)) {
			// get the background color
			RGBQUAD *bkgnd_color = &((FREEIMAGEHEADER *)dib->data)->bkgnd_color;
			memcpy(bkcolor, bkgnd_color, sizeof(RGBQUAD));
			// get the background index
			if(FreeImage_GetBPP(dib) == 8) {
				RGBQUAD *pal = FreeImage_GetPalette(dib);
				for(unsigned i = 0; i < FreeImage_GetColorsUsed(dib); i++) {
					if(bkgnd_color->rgbRed == pal[i].rgbRed) {
						if(bkgnd_color->rgbGreen == pal[i].rgbGreen) {
							if(bkgnd_color->rgbBlue == pal[i].rgbBlue) {
								bkcolor->rgbReserved = i;
								return TRUE;
							}
						}
					}
				}
			}

			bkcolor->rgbReserved = 0;

			return TRUE;
		}
	}

	return FALSE;
}

// this function is only called for the 8bit case!
int Vt2IsoImageFreeImage_c::getPaletteIndex (unsigned int aui_x, unsigned int aui_y)
{
  if (mb_palettized)
  {
    // do this check here, because in case we only use 4bit bitmap, we don't have to care for the palette matching...
    if (mi_colourMismatch >= 0)
    {
      if (isOstream()) getOstream() << "*** COULDN'T LOAD BITMAP: WRONG PALETTE. See (first) mismatching colour #"<<mi_colourMismatch<<" below. Please use the ISO11783-Part 6 (VT)-Palette for bitmaps you have saved palettized and use in 8bit-mode. Use 'vt2iso -p' to generate an .act file and resample your bitmap to use this palette! ***" << std::endl;
      if (isOstream()) getOstream() << "HAS TO BE | you had" << std::hex << std::setfill('0');
      for (int i=0; i<(16+216); i++)
      {
        if ((i % 8) == 0) { if (isOstream()) getOstream() << std::endl; }
        else { if (isOstream()) getOstream() << "     "; }
        if (isOstream()) getOstream() << std::setw(2) << fiuint16_t(vtColourTable[i].bgrRed) << std::setw(2) << fiuint16_t(vtColourTable[i].bgrGreen) << std::setw(2) << fiuint16_t(vtColourTable[i].bgrBlue);
        if (i == mi_colourMismatch) { if (isOstream()) getOstream() << "*|*"; } else { if (isOstream()) getOstream() << " | "; }
        if (isOstream()) getOstream() << std::setw(2) << fiuint16_t(FreeImage_GetPalette (bitmap)[i].rgbRed) << std::setw(2) << fiuint16_t(FreeImage_GetPalette (bitmap)[i].rgbGreen) << std::setw(2) << fiuint16_t(FreeImage_GetPalette (bitmap)[i].rgbBlue);
      }
      if (isOstream()) getOstream() << std::endl;
      b_isInvalidPalette = true;
      return -1;
    }

    fiuint8_t idx;
    FreeImage_GetPixelIndex (bitmap, aui_x, (ui_height - 1) - aui_y, &idx);
    return idx;
  }
  else return -1;
}

BOOL fipImage::setSize(FREE_IMAGE_TYPE image_type, WORD width, WORD height, WORD bpp, unsigned red_mask, unsigned green_mask, unsigned blue_mask) {
	if(_dib) {
		FreeImage_Unload(_dib);
	}
	if((_dib = FreeImage_AllocateT(image_type, width, height, bpp, red_mask, green_mask, blue_mask)) == NULL)
		return FALSE;

	if(image_type == FIT_BITMAP) {
		// Create palette if needed
		switch(bpp)	{
			case 1:
			case 4:
			case 8:
				RGBQUAD *pal = FreeImage_GetPalette(_dib);
				for(unsigned i = 0; i < FreeImage_GetColorsUsed(_dib); i++) {
					pal[i].rgbRed = i;
					pal[i].rgbGreen = i;
					pal[i].rgbBlue = i;
				}
				break;
		}
	}

	_bHasChanged = TRUE;

	return TRUE;
}

/** @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) {
	unsigned i, x, y, k;
	BYTE *bits;

	if (!src) return FALSE;

	int bpp = FreeImage_GetBPP(src);
	
	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 < FreeImage_GetHeight(src); y++) {
					bits = FreeImage_GetScanLine(src, y);

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

			break;
		}		

		case 24 :
		case 32 :
		{
			unsigned bytespp = FreeImage_GetLine(src) / FreeImage_GetWidth(src);

			for(y = 0; y < FreeImage_GetHeight(src); y++) {
				bits =  FreeImage_GetScanLine(src, y);
				for(x = 0; x < FreeImage_GetWidth(src); x++) {
					for(k = 0; k < bytespp; k++) {
						bits[k] = ~bits[k];
					}
					bits += bytespp;
				}
			}

			break;
		}

	}
	return TRUE;
}

void ofxGifEncoder::calculatePalette(FIBITMAP * bmp){
    RGBQUAD *pal = FreeImage_GetPalette(bmp);
    
    for (int i = 0; i < 256; i++) {
        palette.push_back(ofColor(pal[i].rgbRed, pal[i].rgbGreen, pal[i].rgbBlue));
        ofLog() << palette.at(i);
    }
}

/** @brief Retrieves the red, green, blue or alpha channel of a 24- or 32-bit BGR[A] image. 
@param src Input image to be processed.
@param channel Color channel to extract
@return Returns the extracted channel if successful, returns NULL otherwise.
*/
FIBITMAP * DLL_CALLCONV 
FreeImage_GetChannel(FIBITMAP *src, FREE_IMAGE_COLOR_CHANNEL channel) {
	int c;

	if(!src) return NULL;

	unsigned bpp = FreeImage_GetBPP(src);
	if((bpp == 24) || (bpp == 32)) {
		// select the channel to extract
		switch(channel) {
			case FICC_BLUE:
				c = FI_RGBA_BLUE;
				break;
			case FICC_GREEN:
				c = FI_RGBA_GREEN;
				break;
			case FICC_RED: 
				c = FI_RGBA_RED;
				break;
			case FICC_ALPHA:
				if(bpp != 32) return NULL;
				c = FI_RGBA_ALPHA;
				break;
			default:
				return NULL;
		}

		// allocate a 8-bit dib
		unsigned width  = FreeImage_GetWidth(src);
		unsigned height = FreeImage_GetHeight(src);
		FIBITMAP *dst = FreeImage_Allocate(width, height, 8) ;
		if(!dst) return NULL;
		// build a greyscale palette
		RGBQUAD *pal = FreeImage_GetPalette(dst);
		for(int i = 0; i < 256; i++) {
			pal[i].rgbBlue = pal[i].rgbGreen = pal[i].rgbRed = i;
		}

		// perform extraction

		int bytespp = bpp / 8;	// bytes / pixel

		for(unsigned y = 0; y < height; y++) {
			BYTE *src_bits = FreeImage_GetScanLine(src, y);
			BYTE *dst_bits = FreeImage_GetScanLine(dst, y);
			for(unsigned x = 0; x < width; x++) {
				dst_bits[x] = src_bits[c];
				src_bits += bytespp;
			}
		}

		return dst;
	}

	return NULL;
}

bool psdColourModeData::FillPalette(FIBITMAP *dib) {
	RGBQUAD *pal = FreeImage_GetPalette(dib);
	if(pal) {
		for (int i = 0; i < 256; i++) {
			pal[i].rgbRed	= _plColourData[i + 0*256];
			pal[i].rgbGreen = _plColourData[i + 1*256];
			pal[i].rgbBlue	= _plColourData[i + 2*256];
		}
		return true;
	}
	return false;
}

const QVector<QRgb> ImageLoaderFreeImage::colorTable() const
{
    QVector<QRgb> result;

    const RGBQUAD* const palette = FreeImage_GetPalette(m_bitmap);
    if (palette) {
        const int count = FreeImage_GetColorsUsed(m_bitmap);
        result.resize(count);
        for (int i = 0; i < count; i++)
            result.replace(i, qRgb(palette[i].rgbRed, palette[i].rgbGreen, palette[i].rgbBlue));
    }

    return result;
}

FIBITMAP * gifcat(char gifpath[MAXGIFCOUNT][MAXPATHCHAR], unsigned gifPathCount) // 將多張圖片連接為一張圖片
{
	FIBITMAP * hImageAll ;
	unsigned ImgHeightAll = 0 ;
	FIBITMAP * hImage[MAXGIFCOUNT] ;
	unsigned ImgHeight[MAXGIFCOUNT] ;
	unsigned ImgWidth ;
	RGBQUAD * palSrc ;
	RGBQUAD * palAll ;
	unsigned n , NowYPos = 0 ;
//	---
	for ( n=0; n < gifPathCount; ++n) {
		hImage[n] = FreeImage_Load(FIF_GIF, gifpath[n], 0);
		ImgHeight[n] = FreeImage_GetHeight(hImage[n]) ;
		ImgHeightAll += ImgHeight[n] ;
	}
	ImgWidth = FreeImage_GetWidth(hImage[0]) ;

	hImageAll = FreeImage_Allocate(ImgWidth, ImgHeightAll, 8, 0, 0, 0);  //創建目標圖像
	palAll = FreeImage_GetPalette(hImageAll);       // 複製調色板
	palSrc = FreeImage_GetPalette(hImage[0]);
	for (n = 0; n < 256; ++n) {
		palAll[n].rgbRed = palSrc[n].rgbRed ;
		palAll[n].rgbGreen = palSrc[n].rgbGreen ;
		palAll[n].rgbBlue = palSrc[n].rgbBlue ;
	}
	palAll[70].rgbRed = 255   ;
	palAll[70].rgbGreen = 255 ;
	palAll[70].rgbBlue = 255  ;

	for ( n=0; n < gifPathCount; ++n) {  // 粘貼圖像
		FreeImage_Paste(hImageAll, hImage[n], 0, NowYPos, 300) ;
		NowYPos += ImgHeight[n] ;
		FreeImage_Unload(hImage[n]) ;
	}
	return hImageAll ;
}

/** @brief Determines, whether a palletized image is visually greyscale or not.
 
 Unlike with FreeImage_GetColorType, which returns either FIC_MINISBLACK or
 FIC_MINISWHITE for a greyscale image with a linear ramp palette, the return  
 value of this function does not depend on the palette's order, but only on the
 palette's individual colors.
 @param dib The image to be tested.
 @return Returns TRUE if the palette of the image specified contains only
 greyscales, FALSE otherwise.
 */
static BOOL
IsVisualGreyscaleImage(FIBITMAP *dib) {

	switch (FreeImage_GetBPP(dib)) {
		case 1:
		case 4:
		case 8: {
			unsigned ncolors = FreeImage_GetColorsUsed(dib);
			RGBQUAD *rgb = FreeImage_GetPalette(dib);
			for (unsigned i = 0; i< ncolors; i++) {
				if ((rgb->rgbRed != rgb->rgbGreen) || (rgb->rgbRed != rgb->rgbBlue)) {
					return FALSE;
				}
			}
			return TRUE;
		}
		default: {
			return (FreeImage_GetColorType(dib) == FIC_MINISBLACK);
		}
	}
}

/** Create a Zone Plate test pattern.

  The circular zone plate has zero horizontal and vertical frequencies at the center. 
  Horizontal frequencies increase as you move horizontally, and vertical frequencies increase as you move vertically.
  These patterns are useful to:
  <ul>
  <li> evaluate image compression 
  <li> evaluate filter properties 
  <li> evaluate the quality of resampling algorithms 
  <li> adjust gamma correction - at the proper gamma setting, the møires should be minimized 
  </ul>
  Reference: 
  [1] Ken Turkowski, Open Source Repository. [Online] http://www.worldserver.com/turk/opensource/
*/
FIBITMAP* createZonePlateImage(unsigned width, unsigned height, int scale) {
	const double PI = 3.1415926535898;
	BYTE sinTab[256];

	FIBITMAP *dst;
	int i, j, x, y;
	int cX, cY, d;

	// allocate a 8-bit dib
	dst = FreeImage_Allocate(width, height, 8);
	if(!dst)
		return NULL;

	// build a greyscale palette
	RGBQUAD *pal = FreeImage_GetPalette(dst);
	for(i = 0; i < 256; i++) {
		pal[i].rgbRed = i;
		pal[i].rgbGreen = i;
		pal[i].rgbBlue = i;
	}

	// build the sinus table
	for(i = 0; i < 256; i++) {
		sinTab[i] = (BYTE)(127.5 * sin(PI * (i - 127.5) / 127.5) + 127.5);
	}

	cX = width / 2;
	cY = height / 2;
	
	// create a zone plate
	for(i = height, y = -cY; i--; y++) {
		BYTE *dst_bits = FreeImage_GetScanLine(dst, i);
		for (j = width, x = -cX; j--; x++) {
			d = ((x * x + y * y) * scale) >> 8;
			dst_bits[j] = sinTab[d & 0xFF];
		}
	}

	return dst;
}

//----------------------------------------------------
FIBITMAP *  getBmpFromPixels(ofPixels &pix){

	FIBITMAP * bmp = NULL;

	int w						= pix.getWidth();
	int h						= pix.getHeight();
	unsigned char * pixels		= pix.getPixels();
	int bpp						= pix.getBitsPerPixel();
	int bytesPerPixel			= pix.getBytesPerPixel();

	bmp							= FreeImage_ConvertFromRawBits(pixels, w,h, w*bytesPerPixel, bpp, 0,0,0, true);

	//this is for grayscale images they need to be paletted from: http://sourceforge.net/forum/message.php?msg_id=2856879
	if( pix.getImageType() == OF_IMAGE_GRAYSCALE ){
		RGBQUAD *pal = FreeImage_GetPalette(bmp);
		for(int i = 0; i < 256; i++) {
			pal[i].rgbRed = i;
			pal[i].rgbGreen = i;
			pal[i].rgbBlue = i;
		}
	}

	return bmp;
}