Phase 7: Annotations and Forms

[tlkahn]

Goal

Read, create, and modify annotations and form fields. Fill forms and save.

Tasks

• Add annotation FFI: FPDFPage_GetAnnotCount, FPDFPage_GetAnnot, FPDFAnnot_GetSubtype, FPDFAnnot_GetRect, FPDFAnnot_GetStringValue, FPDFAnnot_SetRect, FPDFAnnot_SetStringValue, FPDFPage_CreateAnnot, FPDFPage_RemoveAnnot
• Add form FFI: FPDFDOC_InitFormFillEnvironment, FPDFDOC_ExitFormFillEnvironment, FPDFAnnot_GetFormFieldType, FPDFAnnot_GetFormFieldName, FPDFAnnot_GetFormFieldValue, FPDFAnnot_SetFormFieldValue, FPDFAnnot_IsChecked
• Implement AnnotationRef, AnnotationType, AnnotationData
• Implement annotation read: page_annotations(), annotation_type(), annotation_bounds(), annotation_contents()
• Implement annotation write: create_annotation(), set_annotation_contents(), delete_annotation()
• Implement form field read: page_form_fields(), form_field_type(), form_field_name(), form_field_value()
• Implement form field write: set_form_field_value(), set_form_field_checked()
• Integrate form handle into Document drop ordering (form before pages before document)
• Tests: read annotations from test PDFs, create annotations, fill form fields, save and verify
• Write examples/form_fill.rs

Exit Criterion

Can read, create, and modify annotations. Can fill form fields and save.

Dependencies

• Phase 6: Document Creation and Mutation #7 (Phase 6: Document Creation and Mutation)