jmeaster30/BlastPDF

Need to Enforce the Graphics State Graph

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jmeaster30 commented

Figure 9 on page 113 shows a state graph of the allowed operators in each graphics mode.

  • Path Object
    • Starts with a move or a rect
    • Only allow path construction operators
    • exit Path Object through path-painting operators
    • clipping path operators turn it into a clipping path object
    • exit clipping path object with path-painting operators
  • Text Object
    • Starts with BT operator
    • Ends with ET operator
    • General Graphics State operators
    • Color
    • Text State
    • Text Showing
    • Text Positioning
    • Marked Content
  • Shading Object
    • Just an "sh" operator
  • In-line image object
    • Starts with BI operator
    • Ends with EI operator
    • Only allow ID operators
  • External object
    • Just a Do operator