https://issues.apache.org/bugzilla/show_bug.cgi?id=57361
Bug ID: 57361
Summary: Cropping background images.
Product: POI
Version: 3.10-FINAL
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: XSLF
Assignee: [email protected]
Reporter: [email protected]
Created attachment 32299
--> https://issues.apache.org/bugzilla/attachment.cgi?id=32299&action=edit
patch + samples of cropping the background images.
Hi, folks!
I'm trying to convert pptx slides to images with the code:
FileInputStream is = new FileInputStream("slideshow.pptx");
XMLSlideShow ppt = new XMLSlideShow(is);
is.close();
Dimension pgsize = ppt.getPageSize();
Slide[] slide = ppt.getSlides();
for (int i = 0; i < slide.length; i++) {
BufferedImage img = new BufferedImage(pgsize.width, pgsize.height,
BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = img.createGraphics();
//clear the drawing area
graphics.setPaint(Color.white);
graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width,
pgsize.height));
//render
slide[i].draw(graphics);
//save the output
FileOutputStream out = new FileOutputStream("slide-" + (i+1) +
".png");
javax.imageio.ImageIO.write(img, "png", out);
out.close();
}
If background image is bigger than a slide, then it's cropped to a slide width
and height. So you get left top corner of an image as a result. If background
image is smaller, then it takes only a part of slide's area(see the attached
files).
BTW, I've made the changes in attached patch to eliminate the issue.
In the patch we just transform image to slide's size. Obviously the solution is
wrong, because we should preserve whole image unscaled till the last
render(otherwise we'll loose quality), but it solved the problem of cropping
the background image for me.
Artem
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