Cache for PDFViewThumb

thiagopelikan
Topic Author
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Junior Member

IP: 177.55.163.6 6 years 10 months ago #14625 by thiagopelikan

Replied by thiagopelikan on topic Cache for PDFViewThumb

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:

Code:

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

radaee
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Platinum Member

IP: 111.196.241.37 6 years 10 months ago - 6 years 10 months ago #14626 by radaee

Replied by radaee on topic Cache for PDFViewThumb

Code:

            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:

Code:

            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(...);

Last edit: 6 years 10 months ago by radaee.

thiagopelikan
Topic Author
Offline
Junior Member

IP: 200.236.249.149 6 years 10 months ago #14627 by thiagopelikan

Replied by thiagopelikan on topic Cache for PDFViewThumb

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?

radaee
Offline
Platinum Member

IP: 111.196.241.37 6 years 10 months ago - 6 years 10 months ago #14628 by radaee

Replied by radaee on topic Cache for PDFViewThumb

sorry, not see your codes in correct way.

Code:

        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;
    }

Last edit: 6 years 10 months ago by radaee.

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