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class PdfColorstackWhatsitNode

  • supers: WhatsitNode

From the pdfTeX manual:

\pdfcolorstack ⟨stack number⟩ ⟨stack action⟩ ⟨general text⟩

The command operates on the stack of a given number. If ⟨stack action⟩ is push keyword, the new value provided as ⟨general text⟩ is inserted into the top of the graphic stack and becomes the current stack value. If followed by pop, the top value is removed from the stack and the new top value becomes the current. set keyword replaces the current value with ⟨general text⟩ without changing the stack size. current keyword instructs just to use the current stack value without modifying the stack at all.

Example:

assert.node_type("whatsit", "pdf_colorstack", {
  id = "whatsit (8)",
  subtype = "pdf_colorstack (29)",
  fields = {
    "prev (-1)",
    "next (0)",
    "id (1)",
    "subtype (2)",
    "attr (3)",
    "stack (4)",
    "cmd (5)",
    "data (6)",
  },
})

Reference:

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fields

PdfColorstackWhatsitNode.stack

PdfColorstackWhatsitNode.stack : integer

The colorstack id number.

PdfColorstackWhatsitNode.command

PdfColorstackWhatsitNode.command : integer

The command to execute. ⟨stack action⟩ → set (0) | push (1) | pop (2) | current (3) texnodes.c#L3523-L3545

PdfColorstackWhatsitNode.data

PdfColorstackWhatsitNode.data : string

General text that is placed on top of the stack, for example 1 0 0 rg 1 0 0 RG. rg only colors filled outlines while the stroke color is set with RG. From the PDF Reference, fourth edition, 4.5.7 Color Operators Page 251: gray G: Set the stroking color space to DeviceGray. gray is a number between 0.0 (black) and 1.0 (white). gray g: Same as G, but for nonstroking operations. r g b RG: Set the stroking color space to DeviceRGB. Each operand must be a number between 0.0 (minimum intensity) and 1.0 (maximum intensity). r g b rg: same as RG, but for nonstroking operations. c m y k K: Set the stroking color space to DeviceCMYK. Each operand must be a number between 0.0 (zero concentration) and 1.0 (maximum concentration). c m y k k: Same as K, but for nonstroking operations.