THPDFPageRenderBackendRequest Record

Bundles the document access, compiled display list, page index, and resolution a render backend needs to rasterize one page

Declaration

THPDFPageRenderBackendRequest= record
  Access: THPDFRenderDocAccess;
  DisplayList: THPDFPageDisplayList;
  PageIndex: Integer;
  DPI: Integer;
end;

HPDFPageRenderer

Field	Purpose
`Access`	Document access handle through which the backend reads page resources such as fonts and image XObjects
`DisplayList`	Compiled `THPDFPageDisplayList` holding the page tokens, operators, and classified objects
`PageIndex`	Index of the loaded page being rendered
`DPI`	Target resolution in dots per inch for the output bitmap

Passed to IHPDFPageRenderBackend.RenderPage; custom backends receive the same record as the native GDI backend
The display list is compiled once per page and can be reused across requests at different DPI values
Backends must treat Access as read-only and pull resources through it instead of reaching into the document directly