Oliver Schmidtmer created PDFBOX-5378:
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Summary: Slow rendering due to rescaling
Key: PDFBOX-5378
URL: https://issues.apache.org/jira/browse/PDFBOX-5378
Project: PDFBox
Issue Type: Bug
Reporter: Oliver Schmidtmer
Attachments: Test_2.pdf
Due to changes for better image quality when images are scaled down in
[https://svn.apache.org/viewvc/pdfbox/branches/2.0/pdfbox/src/main/java/org/apache/pdfbox/rendering/PageDrawer.java?r1=1877290&r2=1877289&pathrev=1877290]
the attached PDF renders much slower.
I propose to replace image.gerScaledInstance by
{code:java}
public BufferedImage getRescaledImage( BufferedImage image, int w, int h )
throws IOException {
float scaleW = w / (( float )image.getWidth());
float scaleH = h / (( float )image.getHeight());
if(scaleW < .5f || scaleH < .5f){
int nextW = scaleW <.5f ? ( int )Math.ceil( image.getWidth() / 2.0 ) : w;
int nextH = scaleH <.5f ? ( int )Math.ceil( image.getHeight() / 2.0 ) : h;
image = getRescaledImage( image, nextW, nextH );
}
int type = (image.getTransparency() == Transparency.OPAQUE) ?
BufferedImage.TYPE_INT_RGB
: BufferedImage.TYPE_INT_ARGB;
BufferedImage scaled = new BufferedImage( w, h, type );
Graphics2D g = scaled.createGraphics();
g.setRenderingHint( RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR );
g.drawImage( image, 0, 0, w, h, null );
return scaled;
}{code}
While this implementations seems to be a bit slower than getScaledInstance, the
call to graphics.drawImage with the resulting BufferedImage seems to be
significantly faster than drawing the ToolkitImage.
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