fontgrabber.java

使用servlet开发的动态生成GIF图像

import java.io.*;
import java.awt.Image;
import java.awt.image.MemoryImageSource;

/**
 * FontGrabber - Build an Image with a text and bitmap fonts.
 * @version    1.0
 * @author	   S.H.
 * @company    JavaZOOM.
 * @date       01/2000.
 *
 * Use of this source and binary code is permitted only for non-commercial purposes.
 * Modification is allowed with this copyright notice and the following disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

public class fontgrabber
{

   private int[]       		 theFonts;
   private int         		 imageW;
   private int		   		 imageH;
   private int         		 fontWidth;
   private int         		 fontHeight;
   private int		   		 Yspacing;
   private MemoryImageSource theImageProd = null;
   private int         		 pixels[];
   private String      		 theText;

   /**
    * Constructor.
    *
    * @param fi				Font file (RGB data + Descriptor).
	* @param theTxt			The text to build.
	* @param BgValue		Background color to apply.
	*/
   public fontgrabber(fontinfo fi, String theTxt, int BgValue)
   {
	  fontWidth = fi.getWidth();
      fontHeight = fi.getHeight();
	  Yspacing = fi.getYSpacing();
      theText = theTxt;
      theFonts = fi.getData();
	  imageW = fi.getImageWidth();
	  imageH = fi.getImageHeight();
	  String alphaIndex = fi.getIndex();

      /*-- We create the TextBanner by grabbing font letters in the image fonts --*/
      pixels = new int[theText.length() * fontWidth * fontHeight];
	  int SpacePosition = 0;
	  int offsetSp = 0;

	  /*-- We search the space position in the Alphabet index --*/
      while ( (offsetSp < alphaIndex.length()) && (alphaIndex.charAt(offsetSp) != ' ') )
      {offsetSp++;}
	  if (offsetSp < alphaIndex.length()) SpacePosition = offsetSp;

      for (int offsetT = 0;offsetT < theText.length(); offsetT++)
      {
          int    xPos = 0;
          int    yPos = 0;
          int    reste = 0;
          int    entie = 0;
          int    offsetA = 0;
		  int    FontPerLine = (int) Math.rint((imageW/fontWidth));

	  	  /*-- We search the letter's position in the Alphabet index --*/
          while ( (offsetA < alphaIndex.length()) && (theText.charAt(offsetT) != alphaIndex.charAt(offsetA)) )
          {
			 offsetA++;
		  }

		  /*-- We deduce its image's position (Int forced) --*/
		  if (offsetA < alphaIndex.length())
		  {
          	reste = offsetA % FontPerLine;
          	entie = (offsetA - reste);
          	xPos = reste * fontWidth;
          	yPos = ((entie/FontPerLine) * fontHeight) + ((entie/FontPerLine)*Yspacing);
		  }
		  else

		  /*-- If the letter is not indexed the space (if available) is selected --*/
		  {
          	reste = SpacePosition % FontPerLine;
          	entie = (SpacePosition- reste);
          	xPos = reste * fontWidth;
          	yPos = ((entie/FontPerLine) * fontHeight) + ((entie/FontPerLine)*Yspacing);
		  }

          /*-- We grab the letter in the font image and put it in a pixel array --*/
          for (int l=0;l<fontHeight;l++)
          {
			  for (int k=0;k<fontWidth;k++)
			  {
				  pixels[l*(theText.length()*fontWidth) + offsetT*fontWidth + k] =  theFonts[(yPos+l)*imageW + xPos + k];
			  }
		  }
        }

	  /*-- Change 0x000000 to bgColor --*/
	  int Couleur = BgValue;
	  for (int k=0;k<theText.length() * fontWidth * fontHeight;k++)
	  {
	   	 if ( ((pixels[k])&(0x00ffffff)) == 0) pixels[k] = Couleur;
	  }

      /*-- We create the final Producer --*/
	  theImageProd = new MemoryImageSource(theText.length()*fontWidth, fontHeight, pixels, 0, theText.length()*fontWidth);

   }

   /**
    * Returns an ImageProducer.
    */
   public MemoryImageSource getImageProd()
   {
		return theImageProd;
   }

   /**
    * Returns the pixel array matching to the Image.
    */
   public int[] getPixels()
   {
      return pixels;
   }

   /**
    * Returns Image Width.
    */
   public int getPixelsW()
   {
      return theText.length()*fontWidth;
   }

   /**
    * Returns Image Height
    */
   public int getPixelsH()
   {
      return fontHeight;
   }
}