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package gl4java.utils.textures;
import gl4java.*;
import java.io.*;
import java.net.*;
/**
* This abstract Class defines the interface
* for ALL texture Grabbers !
* The TextureGrabber's implementations are used to
* save the pixels of the GL Context to a file !
*
* @see TextureTool
* @see GLImageCanvas
*/
public abstract class TextureGrabber
implements GLEnum, GLUEnum
{
protected byte[] pixels=null;
protected int xpos;
protected int ypos;
protected int width;
protected int height;
protected GLFunc gl;
public TextureGrabber(GLFunc gl)
{
this.gl=gl;
}
/**
* Grab the pixels outta the OpenGL Frambuffer
*
* @param source the frambuffer source (like glReadBuffer),
* can be: GL_FRONT, GL_BACK, ....
* @param x the xpos
* @param y the ypos
* @param w the width
* @param h the height
*
* @see GLFunc#glReadBuffer
*/
public void grabPixels(int source, int x, int y, int w, int h)
{
int swapbytes[]={0}, lsbfirst[]={0}, rowlength[]={0};
int skiprows[]={0}, skippixels[]={0}, alignment[]={0};
xpos=x;
ypos=y;
width=w;
height=h;
pixels=new byte[w * h * 3];
/* Save current modes. */
gl.glGetIntegerv(GL_PACK_SWAP_BYTES, swapbytes);
gl.glGetIntegerv(GL_PACK_LSB_FIRST, lsbfirst);
gl.glGetIntegerv(GL_PACK_ROW_LENGTH, rowlength);
gl.glGetIntegerv(GL_PACK_SKIP_ROWS, skiprows);
gl.glGetIntegerv(GL_PACK_SKIP_PIXELS, skippixels);
gl.glGetIntegerv(GL_PACK_ALIGNMENT, alignment);
/* Little endian machines (DEC Alpha, Intel 80x86, ... for example) could
benefit from setting GL_PACK_LSB_FIRST to GL_TRUE
instead of GL_FALSE, but this would require changing the
generated bitmaps too. */
gl.glPixelStorei(GL_PACK_SWAP_BYTES, 0);
gl.glPixelStorei(GL_PACK_LSB_FIRST, 1);
gl.glPixelStorei(GL_PACK_ROW_LENGTH, w);
gl.glPixelStorei(GL_PACK_SKIP_ROWS, 0);
gl.glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
gl.glPixelStorei(GL_PACK_ALIGNMENT, 1);
//get viewport data
gl.glReadBuffer(source);
gl.glReadPixels(x, y, w, h, GL_RGB, GL_UNSIGNED_BYTE, pixels);
gl.glPixelStorei(GL_PACK_SWAP_BYTES, swapbytes[0]);
gl.glPixelStorei(GL_PACK_LSB_FIRST, lsbfirst[0]);
gl.glPixelStorei(GL_PACK_ROW_LENGTH, rowlength[0]);
gl.glPixelStorei(GL_PACK_SKIP_ROWS, skiprows[0]);
gl.glPixelStorei(GL_PACK_SKIP_PIXELS, skippixels[0]);
gl.glPixelStorei(GL_PACK_ALIGNMENT, alignment[0]);
}
public boolean write2File(String fname)
{
try {
OutputStream os= new java.io.FileOutputStream(fname);
return write2File(os);
} catch (Exception ex) {
System.out.println("TGATextureGrabber.write2File <"+
fname+"> failed !\n"+ex);
}
return false;
}
public boolean write2File(URL base, String uri)
{
try {
URL url = new URL (base, uri);
URLConnection urlcon = url.openConnection();
urlcon.setDoOutput(true);
OutputStream os = urlcon.getOutputStream();
return write2File(os);
} catch (Exception ex) {
System.out.println("TGATextureGrabber.write2File <"+
base+" / "+uri+"> failed !\n"+ex);
}
return false;
}
public abstract boolean write2File(OutputStream os);
}
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