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TOPIC: Rendering of preview of page

Rendering of preview of page 3 years 10 months ago #8265

  • petr.sklenicka
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Hi,
I have a problem with rendering previews of pages. There is a one page in my PDF document, which causes hard crash when rendering preview of this page. The rendering of previews works fine for all other pages, but this one page causes some hard error.
This is a link for this page: www.dropbox.com/s/fw2j5occ3ss3ojb/Page.pdf?dl=0
I am able to display this page, but I am not able to render the preview of this page.
Can you please give me an advice, what is wrong or how can I solve it?
Many thanks, Petr.

UPDATE:
I am using the newest version of native library.

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Last edit: by sanyu erisa. Reason: Add some information

Rendering of preview of page 3 years 10 months ago #8266

  • radaee
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how you rendering previews of pages?
may you give piece of codes?

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Rendering of preview of page 3 years 10 months ago #8267

  • petr.sklenicka
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I am using this piece of code:
PDFVPage page = mPages[numberOfPage];
...
// get width and height of page
...

// Rendering process
page.thumbPrepare(width, height, scale);
        Bitmap bitmap = mRenderThread.renderThumb(page.m_thumb, width, height);
        page.m_thumb.clear();

        if (bitmap != null) {
            return bitmap;
        } else {
            throw new IOException("The bitmap has not been rendered");
        }

where method renderThumb looks like this:
public Bitmap renderThumb(PDFVThumb thumb, int width, int height) {
        return thumb.render(width, height);
    }

and code for render method:
protected Bitmap render(int width, int height) {
        m_page = m_doc.GetPage(m_pageno);
        if (m_bmpw > 0 && m_bmph > 0) {
            try {
                Bitmap bmp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
                bmp.eraseColor(0xFFFFFFFF);
                Matrix mat = new Matrix(m_scale, -m_scale, 0, m_bmph);                
                m_page.RenderToBmp(bmp, mat);
                mat.Destroy();
                return bmp;
            } catch (Exception e) {
                return null;
            }
        }
        return null;
    }

Then, I need to save preview into the file. I am using this: www.androidpdf.mobi/forum/Android-develo...f-page-into-the-file

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Rendering of preview of page 3 years 10 months ago #8268

  • radaee
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codes modified so much...
in last version, there are no PDFVThumb class.
i think codes like this:
protected Bitmap render(int width, int height)
{
Page page = m_doc.GetPage(m_pageno);
if (m_bmpw > 0 && m_bmph > 0) {
try {
Bitmap bmp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
bmp.eraseColor(0xFFFFFFFF);
Matrix mat = new Matrix(m_scale, -m_scale, 0, m_bmph);                
page.RenderToBmp(bmp, mat);
mat.Destroy();
page.Close();
return bmp;
} catch (Exception e) {
if(bmp != null) bmp.recycle();
page.Close();
return null;
}
}
if(bmp != null) bmp.recycle();
page.Close();
return null;
}

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