Question About PDFium Rendering Pipeline and GPU Acceleration

[llewelyn LUO]

Hello PDFium Team,

I have been studying PDFium and am interested in understanding the architecture of its rendering pipeline.

From my current understanding, PDFium's page rendering process appears to rely primarily on CPU-based rasterization. I would like to confirm whether this is still the case in the current version of PDFium.

If so, I am curious about the design considerations behind this decision. For example:

• Are there technical challenges in mapping the PDF rendering model to modern GPU pipelines?

• Are there concerns regarding rendering accuracy, determinism, or compatibility across platforms?

• Is CPU rendering generally considered sufficient for the performance requirements of PDFium's primary use cases?

• Has the team evaluated GPU-accelerated rendering approaches in the past, and if so, what were the major trade-offs?

I would also be interested to know whether there are any plans or ongoing efforts related to GPU-assisted rendering in PDFium.

Thank you for your time and for maintaining this excellent project.

Best regards