var (
// ErrInvalidOperand specifies that invalid operands have been encountered
// while parsing the content stream.
ErrInvalidOperand = errors.New("invalid operand")
ErrEarlyExit = errors.New("terminate process early exit")
)
ContentCreator is a builder for PDF content streams.
type ContentCreator struct {
// contains filtered or unexported fields
}
func NewContentCreator() *ContentCreator
NewContentCreator returns a new initialized ContentCreator.
func (cc *ContentCreator) AddOperand(op ContentStreamOperation) *ContentCreator
AddOperand adds a specified operand.
func (cc *ContentCreator) Add_B() *ContentCreator
Add_B appends 'B' operand to the content stream: Fill and then stroke the path (nonzero winding number rule).
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_BDC(tag core.PdfObjectName, propertyList map[string]core.PdfObject) *ContentCreator
Add_BDC appends 'BDC' operand to the content stream: Begins a marked-content sequence with an associated property list terminated by a balancing EMC operator. `tag` shall be a name object indicating the role or significance of the sequence. `propertyList` shall be a dictionary containing the properties of the
See section 14.6 "Marked Content" and Table 320 (p. 561 PDF32000_2008).
func (cc *ContentCreator) Add_BMC(tag core.PdfObjectName) *ContentCreator
Add_BMC appends 'BMC' operand to the content stream: Begins a marked-content sequence terminated by a balancing EMC operator. `tag` shall be a name object indicating the role or significance of the sequence.
See section 14.6 "Marked Content" and Table 320 (p. 561 PDF32000_2008).
func (cc *ContentCreator) Add_BT() *ContentCreator
Add_BT appends 'BT' operand to the content stream: Begin text.
See section 9.4 "Text Objects" and Table 107 (p. 256 PDF32000_2008).
func (cc *ContentCreator) Add_B_starred() *ContentCreator
Add_B_starred appends 'B*' operand to the content stream: Fill and then stroke the path (even-odd rule).
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_CS(name core.PdfObjectName) *ContentCreator
Add_CS appends 'CS' operand to the content stream: Set the current colorspace for stroking operations.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_Do(name core.PdfObjectName) *ContentCreator
Add_Do adds 'Do' operation to the content stream: Displays an XObject (image or form) specified by `name`.
See section 8.8 "External Objects" and Table 87 (pp. 209-220 PDF32000_2008).
func (cc *ContentCreator) Add_EMC() *ContentCreator
Add_EMC appends 'EMC' operand to the content stream: Ends a marked-content sequence.
See section 14.6 "Marked Content" and Table 320 (p. 561 PDF32000_2008).
func (cc *ContentCreator) Add_ET() *ContentCreator
Add_ET appends 'ET' operand to the content stream: End text.
See section 9.4 "Text Objects" and Table 107 (p. 256 PDF32000_2008).
func (cc *ContentCreator) Add_G(gray float64) *ContentCreator
Add_G appends 'G' operand to the content stream: Set the stroking colorspace to DeviceGray and sets the gray level (0-1).
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_J(lineCapStyle string) *ContentCreator
Add_J adds 'J' operand to the content stream: Set the line cap style (graphics state).
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_K(c, m, y, k float64) *ContentCreator
Add_K appends 'K' operand to the content stream: Set the stroking colorspace to DeviceCMYK and sets the c,m,y,k color (0-1 each component).
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_M(miterlimit float64) *ContentCreator
Add_M adds 'M' operand to the content stream: Set the miter limit (graphics state).
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_Q() *ContentCreator
Add_Q adds 'Q' operand to the content stream: Pops the most recently stored state from the stack.
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_RG(r, g, b float64) *ContentCreator
Add_RG appends 'RG' operand to the content stream: Set the stroking colorspace to DeviceRGB and sets the r,g,b colors (0-1 each).
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_S() *ContentCreator
Add_S appends 'S' operand to the content stream: Stroke the path.
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_SC(c ...float64) *ContentCreator
Add_SC appends 'SC' operand to the content stream: Set color for stroking operations. Input: c1, ..., cn.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_SCN(c ...float64) *ContentCreator
Add_SCN appends 'SCN' operand to the content stream: Same as SC but supports more colorspaces.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_SCN_pattern(name core.PdfObjectName, c ...float64) *ContentCreator
Add_SCN_pattern appends 'SCN' operand to the content stream for pattern `name`: SCN with name attribute (for pattern). Syntax: c1 ... cn name SCN.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_TD(tx, ty float64) *ContentCreator
Add_TD appends 'TD' operand to the content stream: Move to start of next line with offset (`tx`, `ty`).
See section 9.4.2 "Text Positioning Operators" and Table 108 (pp. 257-258 PDF32000_2008).
func (cc *ContentCreator) Add_TJ(vals ...core.PdfObject) *ContentCreator
Add_TJ appends 'TJ' operand to the content stream: Show one or more text string. Array of numbers (displacement) and strings.
See section 9.4.3 "Text Showing Operators" and Table 209 (pp. 258-259 PDF32000_2008).
func (cc *ContentCreator) Add_TL(leading float64) *ContentCreator
Add_TL appends 'TL' operand to the content stream: Set leading.
See section 9.3 "Text State Parameters and Operators" and Table 105 (pp. 251-252 PDF32000_2008).
func (cc *ContentCreator) Add_Tc(charSpace float64) *ContentCreator
Add_Tc appends 'Tc' operand to the content stream: Set character spacing.
See section 9.3 "Text State Parameters and Operators" and Table 105 (pp. 251-252 PDF32000_2008).
func (cc *ContentCreator) Add_Td(tx, ty float64) *ContentCreator
Add_Td appends 'Td' operand to the content stream: Move to start of next line with offset (`tx`, `ty`).
See section 9.4.2 "Text Positioning Operators" and Table 108 (pp. 257-258 PDF32000_2008).
func (cc *ContentCreator) Add_Tf(fontName core.PdfObjectName, fontSize float64) *ContentCreator
Add_Tf appends 'Tf' operand to the content stream: Set font and font size specified by font resource `fontName` and `fontSize`.
See section 9.3 "Text State Parameters and Operators" and Table 105 (pp. 251-252 PDF32000_2008).
func (cc *ContentCreator) Add_Tj(textstr core.PdfObjectString) *ContentCreator
Add_Tj appends 'Tj' operand to the content stream: Show a text string.
See section 9.4.3 "Text Showing Operators" and Table 209 (pp. 258-259 PDF32000_2008).
func (cc *ContentCreator) Add_Tm(a, b, c, d, e, f float64) *ContentCreator
Add_Tm appends 'Tm' operand to the content stream: Set the text line matrix.
See section 9.4.2 "Text Positioning Operators" and Table 108 (pp. 257-258 PDF32000_2008).
func (cc *ContentCreator) Add_Tr(render int64) *ContentCreator
Add_Tr appends 'Tr' operand to the content stream: Set text rendering mode.
See section 9.3 "Text State Parameters and Operators" and Table 105 (pp. 251-252 PDF32000_2008).
func (cc *ContentCreator) Add_Ts(rise float64) *ContentCreator
Add_Ts appends 'Ts' operand to the content stream: Set text rise.
See section 9.3 "Text State Parameters and Operators" and Table 105 (pp. 251-252 PDF32000_2008).
func (cc *ContentCreator) Add_Tstar() *ContentCreator
Add_Tstar appends 'T*' operand to the content stream: Move to the start of next line.
See section 9.4.2 "Text Positioning Operators" and Table 108 (pp. 257-258 PDF32000_2008).
func (cc *ContentCreator) Add_Tw(wordSpace float64) *ContentCreator
Add_Tw appends 'Tw' operand to the content stream: Set word spacing.
See section 9.3 "Text State Parameters and Operators" and Table 105 (pp. 251-252 PDF32000_2008).
func (cc *ContentCreator) Add_Tz(scale float64) *ContentCreator
Add_Tz appends 'Tz' operand to the content stream: Set horizontal scaling.
See section 9.3 "Text State Parameters and Operators" and Table 105 (pp. 251-252 PDF32000_2008).
func (cc *ContentCreator) Add_W() *ContentCreator
Add_W appends 'W' operand to the content stream: Modify the current clipping path by intersecting with the current path (nonzero winding rule).
See section 8.5.4 "Clipping Path Operators" and Table 61 (p. 146 PDF32000_2008).
func (cc *ContentCreator) Add_W_starred() *ContentCreator
Add_W_starred appends 'W*' operand to the content stream: Modify the current clipping path by intersecting with the current path (even odd rule).
See section 8.5.4 "Clipping Path Operators" and Table 61 (p. 146 PDF32000_2008).
func (cc *ContentCreator) Add_b() *ContentCreator
Add_b appends 'b' operand to the content stream: Close, fill and then stroke the path (nonzero winding number rule).
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_b_starred() *ContentCreator
Add_b_starred appends 'b*' operand to the content stream: Close, fill and then stroke the path (even-odd winding number rule).
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_c(x1, y1, x2, y2, x3, y3 float64) *ContentCreator
Add_c adds 'c' operand to the content stream: Append a Bezier curve to the current path from the current point to (x3,y3) with (x1,x1) and (x2,y2) as control points.
See section 8.5.2 "Path Construction Operators" and Table 59 (pp. 140-141 PDF32000_2008).
func (cc *ContentCreator) Add_cm(a, b, c, d, e, f float64) *ContentCreator
Add_cm adds 'cm' operation to the content stream: Modifies the current transformation matrix (ctm) of the graphics state.
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_cs(name core.PdfObjectName) *ContentCreator
Add_cs appends 'cs' operand to the content stream: Same as CS but for non-stroking operations.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_d(dashArray []int64, dashPhase int64) *ContentCreator
Add_d adds 'd' operand to the content stream: Set the line dash pattern.
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_f() *ContentCreator
Add_f appends 'f' operand to the content stream: Fill the path using the nonzero winding number rule to determine fill region.
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_f_starred() *ContentCreator
Add_f_starred appends 'f*' operand to the content stream. f*: Fill the path using the even-odd rule to determine fill region.
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_g(gray float64) *ContentCreator
Add_g appends 'g' operand to the content stream: Same as G but used for nonstroking operations.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_gs(dictName core.PdfObjectName) *ContentCreator
Add_gs adds 'gs' operand to the content stream: Set the graphics state.
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_h() *ContentCreator
Add_h appends 'h' operand to the content stream: Close the current subpath by adding a line between the current position and the starting position.
See section 8.5.2 "Path Construction Operators" and Table 59 (pp. 140-141 PDF32000_2008).
func (cc *ContentCreator) Add_i(flatness float64) *ContentCreator
Add_i adds 'i' operand to the content stream: Set the flatness tolerance in the graphics state.
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_j(lineJoinStyle string) *ContentCreator
Add_j adds 'j' operand to the content stream: Set the line join style (graphics state).
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_k(c, m, y, k float64) *ContentCreator
Add_k appends 'k' operand to the content stream: Same as K but used for nonstroking operations.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_l(x, y float64) *ContentCreator
Add_l adds 'l' operand to the content stream: Append a straight line segment from the current point to (x,y).
See section 8.5.2 "Path Construction Operators" and Table 59 (pp. 140-141 PDF32000_2008).
func (cc *ContentCreator) Add_m(x, y float64) *ContentCreator
Add_m adds 'm' operand to the content stream: Move the current point to (x,y).
See section 8.5.2 "Path Construction Operators" and Table 59 (pp. 140-141 PDF32000_2008).
func (cc *ContentCreator) Add_n() *ContentCreator
Add_n appends 'n' operand to the content stream: End the path without filling or stroking.
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_q() *ContentCreator
Add_q adds 'q' operand to the content stream: Pushes the current graphics state on the stack.
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_quote(textstr core.PdfObjectString) *ContentCreator
Add_quote appends "'" operand to the content stream: Move to next line and show a string.
See section 9.4.3 "Text Showing Operators" and Table 209 (pp. 258-259 PDF32000_2008).
func (cc *ContentCreator) Add_quotes(textstr core.PdfObjectString, aw, ac float64) *ContentCreator
Add_quotes appends `"` operand to the content stream: Move to next line and show a string, using `aw` and `ac` as word and character spacing respectively.
See section 9.4.3 "Text Showing Operators" and Table 209 (pp. 258-259 PDF32000_2008).
func (cc *ContentCreator) Add_re(x, y, width, height float64) *ContentCreator
Add_re appends 're' operand to the content stream: Append a rectangle to the current path as a complete subpath, with lower left corner (x,y).
See section 8.5.2 "Path Construction Operators" and Table 59 (pp. 140-141 PDF32000_2008).
func (cc *ContentCreator) Add_rg(r, g, b float64) *ContentCreator
Add_rg appends 'rg' operand to the content stream: Same as RG but used for nonstroking operations.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_ri(intent core.PdfObjectName) *ContentCreator
Add_ri adds 'ri' operand to the content stream, which sets the color rendering intent.
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_s() *ContentCreator
Add_s appends 's' operand to the content stream: Close and stroke the path.
See section 8.5.3 "Path Painting Operators" and Table 60 (p. 143 PDF32000_2008).
func (cc *ContentCreator) Add_scn(c ...float64) *ContentCreator
Add_scn appends 'scn' operand to the content stream: Same as SC but for nonstroking operations.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_scn_pattern(name core.PdfObjectName, c ...float64) *ContentCreator
Add_scn_pattern appends 'scn' operand to the content stream for pattern `name`: scn with name attribute (for pattern). Syntax: c1 ... cn name scn.
See section 8.6.8 "Colour Operators" and Table 74 (p. 179-180 PDF32000_2008).
func (cc *ContentCreator) Add_sh(name core.PdfObjectName) *ContentCreator
Add_sh appends 'sh' operand to the content stream: Paints the shape and colour shading described by a shading dictionary specified by `name`, subject to the current clipping path
See section 8.7.4 "Shading Patterns" and Table 77 (p. 190 PDF32000_2008).
func (cc *ContentCreator) Add_v(x2, y2, x3, y3 float64) *ContentCreator
Add_v appends 'v' operand to the content stream: Append a Bezier curve to the current path from the current point to (x3,y3) with the current point and (x2,y2) as control points.
See section 8.5.2 "Path Construction Operators" and Table 59 (pp. 140-141 PDF32000_2008).
func (cc *ContentCreator) Add_w(lineWidth float64) *ContentCreator
Add_w adds 'w' operand to the content stream, which sets the line width.
See section 8.4.4 "Graphic State Operators" and Table 57 (pp. 135-136 PDF32000_2008).
func (cc *ContentCreator) Add_y(x1, y1, x3, y3 float64) *ContentCreator
Add_y appends 'y' operand to the content stream: Append a Bezier curve to the current path from the current point to (x3,y3) with (x1, y1) and (x3,y3) as control points.
See section 8.5.2 "Path Construction Operators" and Table 59 (pp. 140-141 PDF32000_2008).
func (cc *ContentCreator) Bytes() []byte
Bytes converts the content stream operations to a content stream byte presentation, i.e. the kind that can be stored as a PDF stream or string format.
func (cc *ContentCreator) Operations() *ContentStreamOperations
Operations returns the list of operations.
func (cc *ContentCreator) RotateDeg(angle float64) *ContentCreator
RotateDeg applies a rotation to the transformation matrix.
func (cc *ContentCreator) Scale(sx, sy float64) *ContentCreator
Scale applies x-y scaling to the transformation matrix.
func (cc *ContentCreator) SetNonStrokingColor(color model.PdfColor) *ContentCreator
SetNonStrokingColor sets the non-stroking `color` where color can be one of PdfColorDeviceGray, PdfColorDeviceRGB, or PdfColorDeviceCMYK.
func (cc *ContentCreator) SetStrokingColor(color model.PdfColor) *ContentCreator
SetStrokingColor sets the stroking `color` where color can be one of PdfColorDeviceGray, PdfColorDeviceRGB, or PdfColorDeviceCMYK.
func (cc *ContentCreator) String() string
String is same as Bytes() except returns as a string for convenience.
func (cc *ContentCreator) Translate(tx, ty float64) *ContentCreator
Translate applies a simple x-y translation to the transformation matrix.
func (cc *ContentCreator) Wrap()
Wrap ensures that the contentstream is wrapped within a balanced q ... Q expression.
ContentStreamInlineImage is a representation of an inline image in a Content stream. Everything between the BI and EI operands. ContentStreamInlineImage implements the core.PdfObject interface although strictly it is not a PDF object.
type ContentStreamInlineImage struct {
BitsPerComponent core.PdfObject
ColorSpace core.PdfObject
Decode core.PdfObject
DecodeParms core.PdfObject
Filter core.PdfObject
Height core.PdfObject
ImageMask core.PdfObject
Intent core.PdfObject
Interpolate core.PdfObject
Width core.PdfObject
// contains filtered or unexported fields
}
func NewInlineImageFromImage(img model.Image, encoder core.StreamEncoder) (*ContentStreamInlineImage, error)
NewInlineImageFromImage makes a new content stream inline image object from an image.
func (img *ContentStreamInlineImage) GetColorSpace(resources *model.PdfPageResources) (model.PdfColorspace, error)
GetColorSpace returns the colorspace of the inline image.
func (img *ContentStreamInlineImage) GetEncoder() (core.StreamEncoder, error)
GetEncoder returns the encoder of the inline image.
func (img *ContentStreamInlineImage) IsMask() (bool, error)
IsMask checks if an image is a mask. The image mask entry in the image dictionary specifies that the image data shall be used as a stencil mask for painting in the current color. The mask data is 1bpc, grayscale.
func (img *ContentStreamInlineImage) String() string
func (img *ContentStreamInlineImage) ToImage(resources *model.PdfPageResources) (*model.Image, error)
ToImage exports the inline image to Image which can be transformed or exported easily. Page resources are needed to look up colorspace information.
func (img *ContentStreamInlineImage) WriteString() string
WriteString outputs the object as it is to be written to file.
ContentStreamOperation represents an operation in PDF contentstream which consists of an operand and parameters.
type ContentStreamOperation struct {
Params []core.PdfObject
Operand string
}
ContentStreamOperations is a slice of ContentStreamOperations.
type ContentStreamOperations []*ContentStreamOperation
func (ops *ContentStreamOperations) Bytes() []byte
Bytes converts a set of content stream operations to a content stream byte presentation, i.e. the kind that can be stored as a PDF stream or string format.
func (ops *ContentStreamOperations) HasUnclosedQ() bool
HasUnclosedQ checks if all the `q` operator is properly closed by `Q` operator.
func (ops *ContentStreamOperations) String() string
String returns `ops.Bytes()` as a string.
func (ops *ContentStreamOperations) WrapIfNeeded() *ContentStreamOperations
WrapIfNeeded wraps the entire contents within q ... Q. If unbalanced, then adds extra Qs at the end. Only does if needed. Ensures that when adding new content, one start with all states in the default condition.
ContentStreamParser represents a content stream parser for parsing content streams in PDFs.
type ContentStreamParser struct {
// contains filtered or unexported fields
}
func NewContentStreamParser(contentStr string) *ContentStreamParser
NewContentStreamParser creates a new instance of the content stream parser from an input content stream string.
func (csp *ContentStreamParser) ExtractText() (string, error)
ExtractText parses and extracts all text data in content streams and returns as a string. Does not take into account Encoding table, the output is simply the character codes.
Deprecated: More advanced text extraction is offered in package extractor with character encoding support.
func (csp *ContentStreamParser) Parse() (*ContentStreamOperations, error)
Parse parses all commands in content stream, returning a list of operation data.
func (csp *ContentStreamParser) ParseInlineImage() (*ContentStreamInlineImage, error)
ParseInlineImage parses an inline image from a content stream, both reading its properties and binary data. When called, "BI" has already been read from the stream. This function finishes reading through "EI" and then returns the ContentStreamInlineImage.
ContentStreamProcessor defines a data structure and methods for processing a content stream, keeping track of the current graphics state, and allowing external handlers to define their own functions as a part of the processing, for example rendering or extracting certain information.
type ContentStreamProcessor struct {
// contains filtered or unexported fields
}
func NewContentStreamProcessor(ops []*ContentStreamOperation) *ContentStreamProcessor
NewContentStreamProcessor returns a new ContentStreamProcessor for operations `ops`.
func (proc *ContentStreamProcessor) AddHandler(condition HandlerConditionEnum, operand string, handler HandlerFunc)
AddHandler adds a new ContentStreamProcessor `handler` of type `condition` for `operand`.
func (proc *ContentStreamProcessor) Process(resources *model.PdfPageResources) error
Process processes the entire list of operations. Maintains the graphics state that is passed to any handlers that are triggered during processing (either on specific operators or all).
GraphicStateStack represents a stack of GraphicsState.
type GraphicStateStack []GraphicsState
func (gsStack *GraphicStateStack) Pop() GraphicsState
Pop pops and returns the topmost GraphicsState off the `gsStack`.
func (gsStack *GraphicStateStack) Push(gs GraphicsState)
Push pushes `gs` on the `gsStack`.
GraphicsState is a basic graphics state implementation for PDF processing. Initially only implementing and tracking a portion of the information specified. Easy to add more.
type GraphicsState struct {
ColorspaceStroking model.PdfColorspace
ColorspaceNonStroking model.PdfColorspace
ColorStroking model.PdfColor
ColorNonStroking model.PdfColor
CTM transform.Matrix
}
func (gs *GraphicsState) Transform(x, y float64) (float64, float64)
Transform returns coordinates x, y transformed by the CTM.
HandlerConditionEnum represents the type of operand content stream processor (handler). The handler may process a single specific named operand or all operands.
type HandlerConditionEnum int
Handler types.
const (
HandlerConditionEnumOperand HandlerConditionEnum = iota // Single (specific) operand.
HandlerConditionEnumAllOperands // All operands.
)
func (hce HandlerConditionEnum) All() bool
All returns true if `hce` is equivalent to HandlerConditionEnumAllOperands.
func (hce HandlerConditionEnum) Operand() bool
Operand returns true if `hce` is equivalent to HandlerConditionEnumOperand.
HandlerFunc is the function syntax that the ContentStreamProcessor handler must implement.
type HandlerFunc func(op *ContentStreamOperation, gs GraphicsState, resources *model.PdfPageResources) error