OK, I've gotten in over my head at last I think. This is what I have
so far - it's clearly calling the code, but I get tiny (1.1k) pdf with
nothing in it to speak of. I don't even pretend to understand PDF; I'm
just trying to make do with gum and duct tape here.
Warning: ugly code.
I added a class, OnTheFlyFopImage, did various bad things to
FopImageFactory so that I can plug them in and use them, and am stuck
trying to get good output from PDFRenderer - I think I might be having
coordinate space/AffineTransform or just plain PDF formatting
problems. I dunno, you tell me.
I could probably cobble this together as a patch to 0.20.3 and put up
a test case if anyone wanted to actually compile it; I was hoping that
someone would just spot the mistake though.
It's certainly fast :-)
****************************************
First, my OnTheFlyFopImage. As you can see, it does almost nothing
other than store the width and height and provide an abstract
paint(Graphics2D g) method for subclasses.
package org.apache.fop.image;
import org.apache.fop.datatypes.ColorSpace;
import org.apache.fop.pdf.PDFColor;
import org.apache.fop.pdf.PDFFilter;
import java.awt.Graphics2D;
public abstract class OnTheFlyFopImage implements FopImage {
private String url;
private ColorSpace colorSpace;
private int height;
private int width;
public OnTheFlyFopImage(String url, int width, int height) throws
FopImageException {
this.url = url;
this.width = width;
this.height = height;
colorSpace = new ColorSpace(ColorSpace.DEVICE_RGB);
}
public boolean invertImage() {
return false;
}
public String getURL() {
return url;
}
// image size
public int getWidth() throws FopImageException {
return width;
}
public int getHeight() throws FopImageException {
return height;
}
public ColorSpace getColorSpace() throws FopImageException {
return colorSpace;
}
public int getBitsPerPixel() throws FopImageException {
return 24;
}
public boolean isTransparent() throws FopImageException {
return false;
}
public PDFColor getTransparentColor() throws FopImageException {
return new PDFColor(0.0, 0.0, 0.0);
}
// get the image bytes, and bytes properties
// get uncompressed image bytes
public byte[] getBitmaps() throws FopImageException {
return null;
}
// width * (bitsPerPixel / 8) * height, no ?
public int getBitmapsSize() throws FopImageException {
return 0;
}
// get compressed image bytes
// I don't know if we really need it, nor if it
// should be changed...
public byte[] getRessourceBytes() throws FopImageException {
return null;
}
public int getRessourceBytesSize() throws FopImageException {
return 0;
}
// return null if no corresponding PDFFilter
public PDFFilter getPDFFilter() throws FopImageException {
return null;
}
// release memory
public void close() {
}
// ******** subclass homework
public abstract void paint(Graphics2D graphics);
}
****************************************
Here are the relevant parts of PDFRenderer that I modified. I changed
renderImageArea to pass through OnTheFlyFopImages to my new
renderOnTheFlyFopImage subroutine. The latter does the actual
production, or rather lack thereof.
/**
* render image area to PDF
*
* @param area the image area to render
*/
public void renderImageArea(ImageArea area) {
// adapted from contribution by BoBoGi
int x = this.currentXPosition + area.getXOffset();
int y = this.currentYPosition;
int w = area.getContentWidth();
int h = area.getHeight();
this.currentYPosition -= h;
FopImage img = area.getImage();
if (img instanceof SVGImage) {
try {
closeText();
SVGDocument svg = ((SVGImage)img).getSVGDocument();
currentStream.add("ET\nq\n");
renderSVGDocument(svg, (int)x, (int)y,
area.getFontState());
currentStream.add("Q\nBT\n");
} catch (FopImageException e) {}
}
else if (img instanceof OnTheFlyFopImage) {
// try {
closeText();
// currentStream.add("ET\nq\n");
renderOnTheFlyFopImage((OnTheFlyFopImage)img, x, y,
area.getFontState());
// currentStream.add("Q\nBT\n");
// } catch (FopImageException e) {}
}
else {
int xObjectNum = this.pdfDoc.addImage(img);
closeText();
currentStream.add("ET\nq\n" + (((float)w) / 1000f) + " 0 0
"
+ (((float)h) / 1000f) + " "
+ (((float)x) / 1000f) + " "
+ (((float)(y - h)) / 1000f) + " cm\n" +
"/Im"
+ xObjectNum + " Do\nQ\nBT\n");
}
this.currentXPosition += area.getContentWidth();
}
/**
* I copied and butchered this from renderSVGDocument. I took out
* everything that seemed SVG-specific. It runs, and does indeed
* use the graphics object, but nothing comes out in the final.
*/
protected void renderOnTheFlyFopImage(OnTheFlyFopImage image, int
x, int y, FontState fs) {
System.out.println("Rendering on-the-fly graphic to pdf.");
try {
// ******** mysterious stuff here
float sx = 1, sy = -1;
int xOffset = x, yOffset = y;
// get the 'width' and 'height' attributes of the image
float w = (float)image.getWidth() * 1000f;
float h = (float)image.getHeight() * 1000f;
currentStream.add("q\n");
if (w != 0 && h != 0) {
currentStream.add(x / 1000f + " " + y / 1000f + "
m\n");
currentStream.add((x + w) / 1000f + " " + y / 1000f +
" l\n");
currentStream.add((x + w) / 1000f + " " + (y - h) /
1000f
+ " l\n");
currentStream.add(x / 1000f + " " + (y - h) / 1000f +
" l\n");
currentStream.add("h\n");
currentStream.add("W\n");
currentStream.add("n\n");
}
// transform so that the coordinates (0,0) is from the top
left
// and positive is down and to the right. (0,0) is where
the
// viewBox puts it.
currentStream.add(sx + " 0 0 " + sy + " " + xOffset /
1000f + " "
+ yOffset / 1000f + " cm\n");
// do the actual paint
PDFGraphics2D graphics = new PDFGraphics2D(true, fs,
pdfDoc,
currentFontName,
currentFontSize,
currentXPosition,
currentYPosition);
graphics.setGraphicContext(new
org.apache.batik.ext.awt.g2d.GraphicContext());
image.paint(graphics);
// more mystery
currentStream.add(graphics.getString());
currentAnnotList = graphics.getAnnotList();
currentStream.add("Q\n");
}
catch (Exception oopsie) {
oopsie.printStackTrace(System.err);
}
}
--
Paul Reavis [EMAIL PROTECTED]
Design Lead
Partner Software, Inc. http://www.partnersoft.com
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