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37 lines
923 B
Go
37 lines
923 B
Go
//go:build cgo
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package pdf
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import (
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"image"
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"ragflow/internal/deepdoc/parser/pdf/pdfium"
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pdf "ragflow/internal/deepdoc/parser/pdf/type"
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)
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// pdfiumRender uses the pdfium C library for higher-quality rasterisation
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// (AA, hinting) which is essential for downstream OCR/DLA accuracy on
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// scanned or low-quality PDFs.
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func pdfiumRender(engine pdf.PDFEngine, pageNum int) (image.Image, error) {
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raw := engine.RawData()
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if raw == nil {
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// PythonCharEngine and mocks don't carry PDF bytes —
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// fall back to the engine's own RenderPageImage.
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return fallbackRender(engine, pageNum)
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}
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// Guard against typed nil: (*image.RGBA)(nil) wrapped as non-nil interface
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// would panic on downstream .Bounds() / .At() calls.
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img, err := pdfium.RenderPage(raw, pageNum, 216)
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if err != nil {
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return nil, err
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}
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if img == nil {
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return nil, ErrNoPDFData
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}
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return img, nil
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}
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func init() {
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renderFn = pdfiumRender
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}
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