Oliver Schmidtmer created PDFBOX-5378: -----------------------------------------
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. -- This message was sent by Atlassian Jira (v8.20.1#820001) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@pdfbox.apache.org For additional commands, e-mail: dev-h...@pdfbox.apache.org