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From: bugzilla@apache.org
To: dev@poi.apache.org
Subject: [Bug 54210] New: When saving PPT to PNG, some text is rendered
 backwards
Date: Tue, 27 Nov 2012 09:30:47 +0000
Message-ID: <bug-54210-47293@https.issues.apache.org/bugzilla/>
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https://issues.apache.org/bugzilla/show_bug.cgi?id=54210

            Bug ID: 54210
           Summary: When saving PPT to PNG, some text is rendered
                    backwards
           Product: POI
           Version: 3.8
          Hardware: PC
            Status: NEW
          Severity: critical
          Priority: P2
         Component: HSLF
          Assignee: dev@poi.apache.org
          Reporter: vincent.kirsch@iriscorporate.com
    Classification: Unclassified

Created attachment 29643
  --> https://issues.apache.org/bugzilla/attachment.cgi?id=29643&action=edit
This zip contains the PPT file and the PNG image resulting from the code above

When converting the attached PPT file with HSLF, and the code below, some of
the text (but not all of it) is rendered as if seen in a mirror (see the PNG
file attached).

Code snippet: 

InputStream is = getInputStream(); //A FileInputStream on the ppt file
SlideShow ppt = new SlideShow(is);

Dimension pgsize = ppt.getPageSize();
double scaleW = (double)TARGET_WIDTH / (double)pgsize.width;
double scaleH = (double)TARGET_HEIGHT / (double)pgsize.height;
double scale = Math.min(scaleW, scaleH);
int width = (int) (pgsize.width * scale);
int height = (int) (pgsize.height * scale);

Slide[] slide = ppt.getSlides();
for (int i = 0; i < slide.length; i++) 
{
    BufferedImage img = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
    Graphics2D graphics = img.createGraphics();
    graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
    graphics.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
    graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
    graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON);

    graphics.setPaint(Color.white);
    graphics.clearRect(0, 0, width, height);

    graphics.scale((double)width/pgsize.width, (double)height/pgsize.height);

    slide[i].draw(graphics);

    // save the result
    File image = new File(root, "slide"+Integer.toString(i)+".png");
    ImageIO.write(img, "png", image);
}

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