TOPIC:

Cache for PDFViewThumb 4 years 6 months ago #14625

thiagopelikan
Topic Author
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Junior Member
Posts: 36
Thank you received: 0

I'm trying to implement above as you mentioned but I'm having problems to do this.
I think the structure is ok but I didn't understood how to use BMP and DIB objects, could you please help me on that?

For now, I have:

protected void RenderThumb() {
        Bitmap bitmap = null;
        if (m_status == 2) return;

        if (m_page == null)
            m_page = m_doc.GetPage(m_pageno);

        File thumbPath = getThumbPath(m_pageno);
        if (thumbPath.exists()) {
            bitmap = CommonUtil.loadThumb(thumbPath);
            BMP bmp = new BMP();
            bmp.Create(bitmap);

            m_dib = new DIB();
            bmp.DrawToDIB(m_dib, m_dibw, m_dibh);
            Matrix mat = new Matrix(m_scale, -m_scale, 0, m_dibh);
            //How to get a Bitmap object and add to DIB Object
            //How to render a page using a DIB OBJECT
            m_page.RenderPrepare(m_dib);
            m_page.Render(m_dib, mat);
            mat.Destroy();
        } else {
            if (m_dib == null) {
                DIB dib = new DIB();
                dib.CreateOrResize(m_dibw, m_dibh);
                m_page.RenderPrepare(dib);
                m_dib = dib;
            } else m_page.RenderPrepare(m_dib);
            if (m_status == 2) return;
            if (!m_page.RenderThumbToDIB(m_dib)) {
                Matrix mat = new Matrix(m_scale, -m_scale, 0, m_dibh);
                m_page.Render(m_dib, mat);

                bitmap = Bitmap.createBitmap(m_dibw, m_dibh, Bitmap.Config.ARGB_8888);
                //IS IT NECESSARY TO RENDER AS THUMB HERE?? I Tried m_dib.ToBMP without success
                m_page.RenderThumb(bitmap);
                CommonUtil.saveThumb(bitmap, thumbPath);
                mat.Destroy();
            }
        }
        if (m_status != 2)
            m_status = 1;
    }

The files are saved correctly but loading it and render the page from the file is not working.

Tks,
Thiago

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Cache for PDFViewThumb 4 years 6 months ago #14626

radaee
Offline
Moderator
Posts: 1123
Thank you received: 73

            bitmap = CommonUtil.loadThumb(thumbPath);
            BMP bmp = new BMP();
            bmp.Create(bitmap);

            m_dib = new DIB();
            bmp.DrawToDIB(m_dib, m_dibw, m_dibh);
            Matrix mat = new Matrix(m_scale, -m_scale, 0, m_dibh);
            //How to get a Bitmap object and add to DIB Object
            //How to render a page using a DIB OBJECT
            m_page.RenderPrepare(m_dib);
            m_page.Render(m_dib, mat);
            mat.Destroy();

change to:

            m_dib = new DIB();
            m_dib.CreateOrResize(m_dibw, m_dibh);
            Matrix mat = new Matrix(m_scale, -m_scale, 0, m_dibh);
            m_page.RenderPrepare(m_dib);
            m_page.Render(m_dib, mat);
            mat.Destroy();

            bitmap = Bitmap.CreateBitmap(m_dibw, m_dibh, ARGB_8888);
            BMP bmp = new BMP();
            bmp.Create(bitmap);
            m_dib.DrawToBMP(bitmap, m_dibw, m_dibh);
            bmp.Free(bitmap);
            bitmap.Compress(...);

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Last edit: by radaee.

Cache for PDFViewThumb 4 years 6 months ago #14627

thiagopelikan Topic Author Offline Junior Member Posts: 36 Thank you received: 0	The lines you ask me to change are responsible for loading bitmap from sdcard. Using your lines I'll never read files, isn't that correct?
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Cache for PDFViewThumb 4 years 6 months ago #14628

radaee
Offline
Moderator
Posts: 1123
Thank you received: 73

sorry, not see your codes in correct way.

        if (thumbPath.exists()) {//if load from storage
            bitmap = CommonUtil.loadThumb(thumbPath);
            BMP bmp = new BMP();
            bmp.Create(bitmap);
            m_dib = new DIB();
	    m_dib.CreateOrResize(m_dibw, m_dibh);
            bmp.DrawToDIB(m_dib, 0, 0);
	    bmp.Free(bitmap);
        } else {//if not load from storage, we render to DIB, then draw to BMP
		if( m_dib == null )
		{
			DIB dib = new DIB();
			dib.CreateOrResize( m_dibw, m_dibh );
			m_page.RenderPrepare(dib);
			m_dib = dib;
		}
		else m_page.RenderPrepare(m_dib);
		if( m_status == 2 ) return;
		if(!m_page.RenderThumbToDIB(m_dib))
		{
			Matrix mat = new Matrix(m_scale, -m_scale, 0, m_dibh);
			m_page.Render(m_dib, mat);
			mat.Destroy();
		}
                bitmap = Bitmap.createBitmap(m_dibw, m_dibh, Bitmap.Config.ARGB_8888);
                BMP bmp = new BMP();
                bmp.Create(bitmap);
	        m_dib.DrawToBMP(bmp, 0, 0);
	        bmp.Free(bitmap);
                CommonUtil.saveThumb(bitmap, thumbPath);
        }
        if (m_status != 2)
            m_status = 1;
    }

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Last edit: by radaee.

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