[XGC-55] Significant slowdown in PNG and TIFF processing with xmlgraphics 1.4

• Type: Bug
• Status: Reopened
• Resolution: Unresolved
• Affects Version/s: 1.4
• Component/s: image writer
• Environment: Operating System: All; Platform: PC
• Assignee: XML Graphics Project Mailing List
• Reporter: OSC Member
• Created: 02/Jul/11 12:05
• Updated: 26/Jun/21 20:28

Description

Hello,
I’m using fop 1.0 (xmlgraphics 1.4) to generate PDF, I noticed that PDF generation with PNG or TIF image is 7 times longer.
The problem doesn't appear in the version 1.3 of xmlgraphics.

The problem seems to come from color model associated with the image.

• if is_sRGB_stdStale = true then getRBG method is very fast
• if is_sRGB_stdStale = false then getRBG is slow because the treatment is
  delegated to ICC_ColorSpace.toRGB

The color model is correct, but it is modified by the class
org.apache.xmlgraphics.image.loader.impl.imageio.ImageLoaderImageIO
by the following code :
if (providerIgnoresICC && cm instanceof ComponentColorModel) {
// Apply ICC Profile to Image by creating a new image with a new color model.
ICC_Profile iccProf = tryToExctractICCProfile(iiometa);
if (iccProf != null) {
ColorModel cm2 = new ComponentColorModel(
new ICC_ColorSpace(iccProf), cm.hasAlpha(), cm
.isAlphaPremultiplied(), cm
.getTransparency(), cm.getTransferType());
WritableRaster wr = Raster.createWritableRaster(imageData
.getSampleModel(), null);
imageData.copyData(wr);
BufferedImage bi = new BufferedImage(cm2, wr, cm2
.isAlphaPremultiplied(), null);
imageData = bi;
cm = cm2;

I removed this code and it works fine now, but it's dirty. What's the impact ?

Until a fix, best regards.

Issue Links

• is depended upon by: XGC-53 [PATCH] slowdown in PNG processing when switching from JDK 1.6.0_17 to 1.6.0_18