renderPageBitmap - transparency

[isit...@gmail.com]

Is it possible to create a bitmap with transparency, using renderPageBitmap?

At this moment a white background is added to the bitmap. But I want the bitmap without a background.

Any help?

[Lei Zhang]

Maybe? Do you have some sample code to show how you are calling
FPDF_RenderPageBitmap() ?

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[isit...@gmail.com]

I am using PdfiumAndroid. renderPageBitmap -> uses FPDF_RenderPageBitmap as native function

void openPdf(ImageView iv,String pdfName,int pageNum) {
    try {

        InputStream inputStream = getContext().getAssets().open(pdfName);

        byte[] buffer = new byte[8192];
        int bytesRead;
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            output.write(buffer, 0, bytesRead);
        }
        byte bytes[] = output.toByteArray();

        /*Uri uri = Uri.parse("file:///android_asset/landscape_full.pdf");
        ParcelFileDescriptor fd = getContentResolver().openFileDescriptor(uri, "r");*/
        PdfiumCore pdfiumCore = new PdfiumCore(getContext());

        PdfDocument pdfDocument = pdfiumCore.newDocument(bytes);

        pdfiumCore.openPage(pdfDocument, pageNum);

        int width = pdfiumCore.getPageWidthPoint(pdfDocument, pageNum)*2;
        int height = pdfiumCore.getPageHeightPoint(pdfDocument, pageNum)*2;

        // ARGB_8888 - best quality, high memory usage, higher possibility of OutOfMemoryError
        // RGB_565 - little worse quality, twice less memory usage
        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        pdfiumCore.renderPageBitmap(pdfDocument, bitmap, pageNum, 0, 0,
                width, height);
        //if you need to render annotations and form fields, you can use
        //the same method above adding 'true' as last param

        iv.setImageBitmap(bitmap);

        //printInfo(pdfiumCore, pdfDocument);

        pdfiumCore.closeDocument(pdfDocument); // important!
    } catch(IOException ex) {
        ex.printStackTrace();
    }
}

Op donderdag 21 december 2017 04:27:04 UTC+1 schreef Lei Zhang:

[Lei Zhang]

It the bitmap in the code transparent to start with? If it starts with
a white background, then PDFium may be just drawing on top of it.

> https://groups.google.com/d/msgid/pdfium/2038348b-f06a-42e7-8157-4206161922ca%40googlegroups.com.