740 lines
29 KiB
Go
740 lines
29 KiB
Go
/*
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* Copyright (c) 2013-2014 Kurt Jung (Gmail: kurt.w.jung)
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package gofpdf
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import (
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"bytes"
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"crypto/sha1"
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"encoding/gob"
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"encoding/json"
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"fmt"
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"io"
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"time"
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)
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// Version of FPDF from which this package is derived
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const (
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cnFpdfVersion = "1.7"
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)
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type blendModeType struct {
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strokeStr, fillStr, modeStr string
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objNum int
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}
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type gradientType struct {
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tp int // 2: linear, 3: radial
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clr1Str, clr2Str string
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x1, y1, x2, y2, r float64
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objNum int
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}
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const (
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// OrientationPortrait represents the portrait orientation.
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OrientationPortrait = "portrait"
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// OrientationLandscape represents the landscape orientation.
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OrientationLandscape = "landscape"
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)
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const (
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// UnitPoint represents the size unit point
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UnitPoint = "pt"
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// UnitMillimeter represents the size unit millimeter
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UnitMillimeter = "mm"
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// UnitCentimeter represents the size unit centimeter
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UnitCentimeter = "cm"
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// UnitInch represents the size unit inch
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UnitInch = "inch"
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)
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const (
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// PageSizeA3 represents DIN/ISO A3 page size
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PageSizeA3 = "A3"
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// PageSizeA4 represents DIN/ISO A4 page size
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PageSizeA4 = "A4"
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// PageSizeA5 represents DIN/ISO A5 page size
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PageSizeA5 = "A5"
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// PageSizeLetter represents US Letter page size
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PageSizeLetter = "Letter"
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// PageSizeLegal represents US Legal page size
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PageSizeLegal = "Legal"
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)
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const (
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// BorderNone set no border
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BorderNone = ""
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// BorderFull sets a full border
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BorderFull = "1"
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// BorderLeft sets the border on the left side
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BorderLeft = "L"
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// BorderTop sets the border at the top
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BorderTop = "T"
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// BorderRight sets the border on the right side
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BorderRight = "R"
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// BorderBottom sets the border on the bottom
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BorderBottom = "B"
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)
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const (
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// LineBreakNone disables linebreak
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LineBreakNone = 0
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// LineBreakNormal enables normal linebreak
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LineBreakNormal = 1
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// LineBreakBelow enables linebreak below
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LineBreakBelow = 2
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)
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const (
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// AlignLeft left aligns the cell
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AlignLeft = "L"
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// AlignRight right aligns the cell
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AlignRight = "R"
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// AlignCenter centers the cell
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AlignCenter = "C"
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// AlignTop aligns the cell to the top
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AlignTop = "T"
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// AlignBottom aligns the cell to the bottom
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AlignBottom = "B"
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// AlignMiddle aligns the cell to the middle
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AlignMiddle = "M"
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// AlignBaseline aligns the cell to the baseline
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AlignBaseline = "B"
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)
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type colorMode int
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const (
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colorModeRGB colorMode = iota
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colorModeSpot
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colorModeCMYK
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)
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type colorType struct {
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r, g, b float64
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ir, ig, ib int
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mode colorMode
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spotStr string // name of current spot color
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gray bool
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str string
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}
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// SpotColorType specifies a named spot color value
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type spotColorType struct {
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id, objID int
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val cmykColorType
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}
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// CMYKColorType specifies an ink-based CMYK color value
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type cmykColorType struct {
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c, m, y, k byte // 0% to 100%
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}
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// SizeType fields Wd and Ht specify the horizontal and vertical extents of a
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// document element such as a page.
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type SizeType struct {
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Wd, Ht float64
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}
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// PointType fields X and Y specify the horizontal and vertical coordinates of
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// a point, typically used in drawing.
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type PointType struct {
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X, Y float64
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}
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// XY returns the X and Y components of the receiver point.
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func (p PointType) XY() (float64, float64) {
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return p.X, p.Y
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}
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// ImageInfoType contains size, color and other information about an image.
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// Changes to this structure should be reflected in its GobEncode and GobDecode
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// methods.
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type ImageInfoType struct {
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data []byte // Raw image data
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smask []byte // Soft Mask, an 8bit per-pixel transparency mask
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n int // Image object number
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w float64 // Width
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h float64 // Height
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cs string // Color space
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pal []byte // Image color palette
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bpc int // Bits Per Component
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f string // Image filter
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dp string // DecodeParms
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trns []int // Transparency mask
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scale float64 // Document scale factor
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dpi float64 // Dots-per-inch found from image file (png only)
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i string // SHA-1 checksum of the above values.
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}
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func generateImageID(info *ImageInfoType) (string, error) {
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b, err := info.GobEncode()
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return fmt.Sprintf("%x", sha1.Sum(b)), err
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}
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// GobEncode encodes the receiving image to a byte slice.
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func (info *ImageInfoType) GobEncode() (buf []byte, err error) {
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fields := []interface{}{info.data, info.smask, info.n, info.w, info.h, info.cs,
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info.pal, info.bpc, info.f, info.dp, info.trns, info.scale, info.dpi}
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w := new(bytes.Buffer)
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encoder := gob.NewEncoder(w)
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for j := 0; j < len(fields) && err == nil; j++ {
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err = encoder.Encode(fields[j])
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}
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if err == nil {
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buf = w.Bytes()
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}
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return
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}
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// GobDecode decodes the specified byte buffer (generated by GobEncode) into
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// the receiving image.
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func (info *ImageInfoType) GobDecode(buf []byte) (err error) {
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fields := []interface{}{&info.data, &info.smask, &info.n, &info.w, &info.h,
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&info.cs, &info.pal, &info.bpc, &info.f, &info.dp, &info.trns, &info.scale, &info.dpi}
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r := bytes.NewBuffer(buf)
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decoder := gob.NewDecoder(r)
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for j := 0; j < len(fields) && err == nil; j++ {
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err = decoder.Decode(fields[j])
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}
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info.i, err = generateImageID(info)
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return
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}
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// PointConvert returns the value of pt, expressed in points (1/72 inch), as a
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// value expressed in the unit of measure specified in New(). Since font
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// management in Fpdf uses points, this method can help with line height
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// calculations and other methods that require user units.
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func (f *Fpdf) PointConvert(pt float64) (u float64) {
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return pt / f.k
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}
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// PointToUnitConvert is an alias for PointConvert.
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func (f *Fpdf) PointToUnitConvert(pt float64) (u float64) {
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return pt / f.k
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}
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// UnitToPointConvert returns the value of u, expressed in the unit of measure
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// specified in New(), as a value expressed in points (1/72 inch). Since font
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// management in Fpdf uses points, this method can help with setting font sizes
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// based on the sizes of other non-font page elements.
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func (f *Fpdf) UnitToPointConvert(u float64) (pt float64) {
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return u * f.k
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}
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// Extent returns the width and height of the image in the units of the Fpdf
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// object.
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func (info *ImageInfoType) Extent() (wd, ht float64) {
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return info.Width(), info.Height()
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}
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// Width returns the width of the image in the units of the Fpdf object.
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func (info *ImageInfoType) Width() float64 {
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return info.w / (info.scale * info.dpi / 72)
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}
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// Height returns the height of the image in the units of the Fpdf object.
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func (info *ImageInfoType) Height() float64 {
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return info.h / (info.scale * info.dpi / 72)
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}
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// SetDpi sets the dots per inch for an image. PNG images MAY have their dpi
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// set automatically, if the image specifies it. DPI information is not
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// currently available automatically for JPG and GIF images, so if it's
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// important to you, you can set it here. It defaults to 72 dpi.
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func (info *ImageInfoType) SetDpi(dpi float64) {
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info.dpi = dpi
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}
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type fontFileType struct {
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length1, length2 int64
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n int
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embedded bool
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content []byte
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fontType string
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}
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type linkType struct {
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x, y, wd, ht float64
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link int // Auto-generated internal link ID or...
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linkStr string // ...application-provided external link string
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}
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type intLinkType struct {
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page int
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y float64
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}
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// outlineType is used for a sidebar outline of bookmarks
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type outlineType struct {
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text string
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level, parent, first, last, next, prev int
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y float64
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p int
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}
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// InitType is used with NewCustom() to customize an Fpdf instance.
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// OrientationStr, UnitStr, SizeStr and FontDirStr correspond to the arguments
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// accepted by New(). If the Wd and Ht fields of Size are each greater than
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// zero, Size will be used to set the default page size rather than SizeStr. Wd
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// and Ht are specified in the units of measure indicated by UnitStr.
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type InitType struct {
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OrientationStr string
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UnitStr string
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SizeStr string
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Size SizeType
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FontDirStr string
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Density float64
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}
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// FontLoader is used to read fonts (JSON font specification and zlib compressed font binaries)
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// from arbitrary locations (e.g. files, zip files, embedded font resources).
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//
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// Open provides an io.Reader for the specified font file (.json or .z). The file name
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// never includes a path. Open returns an error if the specified file cannot be opened.
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type FontLoader interface {
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Open(name string) (io.Reader, error)
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}
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// Pdf defines the interface used for various methods. It is implemented by the
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// main FPDF instance as well as templates.
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type Pdf interface {
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AddFont(familyStr, styleStr, fileStr string)
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AddFontFromBytes(familyStr, styleStr string, jsonFileBytes, zFileBytes []byte)
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AddFontFromReader(familyStr, styleStr string, r io.Reader)
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AddLayer(name string, visible bool) (layerID int)
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AddLink() int
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AddPage()
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AddPageFormat(orientationStr string, size SizeType)
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AddSpotColor(nameStr string, c, m, y, k byte)
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AliasNbPages(aliasStr string)
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ArcTo(x, y, rx, ry, degRotate, degStart, degEnd float64)
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Arc(x, y, rx, ry, degRotate, degStart, degEnd float64, styleStr string)
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BeginLayer(id int)
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Beziergon(points []PointType, styleStr string)
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Bookmark(txtStr string, level int, y float64)
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CellFormat(w, h float64, txtStr, borderStr string, ln int, alignStr string, fill bool, link int, linkStr string)
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Cellf(w, h float64, fmtStr string, args ...interface{})
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Cell(w, h float64, txtStr string)
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Circle(x, y, r float64, styleStr string)
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ClearError()
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ClipCircle(x, y, r float64, outline bool)
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ClipEllipse(x, y, rx, ry float64, outline bool)
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ClipEnd()
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ClipPolygon(points []PointType, outline bool)
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ClipRect(x, y, w, h float64, outline bool)
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ClipRoundedRect(x, y, w, h, r float64, outline bool)
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ClipText(x, y float64, txtStr string, outline bool)
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Close()
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ClosePath()
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CreateTemplateCustom(corner PointType, size SizeType, fn func(*Tpl)) Template
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CreateTemplate(fn func(*Tpl)) Template
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CurveBezierCubicTo(cx0, cy0, cx1, cy1, x, y float64)
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CurveBezierCubic(x0, y0, cx0, cy0, cx1, cy1, x1, y1 float64, styleStr string)
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CurveCubic(x0, y0, cx0, cy0, x1, y1, cx1, cy1 float64, styleStr string)
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CurveTo(cx, cy, x, y float64)
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Curve(x0, y0, cx, cy, x1, y1 float64, styleStr string)
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DrawPath(styleStr string)
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Ellipse(x, y, rx, ry, degRotate float64, styleStr string)
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EndLayer()
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Err() bool
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Error() error
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GetAlpha() (alpha float64, blendModeStr string)
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GetAutoPageBreak() (auto bool, margin float64)
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GetCellMargin() float64
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GetConversionRatio() float64
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GetDrawColor() (int, int, int)
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GetDrawSpotColor() (name string, c, m, y, k byte)
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GetFillColor() (int, int, int)
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GetFillSpotColor() (name string, c, m, y, k byte)
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GetFontDesc(familyStr, styleStr string) FontDescType
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GetFontSize() (ptSize, unitSize float64)
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GetImageInfo(imageStr string) (info *ImageInfoType)
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GetLineWidth() float64
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GetMargins() (left, top, right, bottom float64)
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GetPageSizeStr(sizeStr string) (size SizeType)
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GetPageSize() (width, height float64)
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GetStringWidth(s string) float64
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GetTextColor() (int, int, int)
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GetTextSpotColor() (name string, c, m, y, k byte)
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GetX() float64
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GetXY() (float64, float64)
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GetY() float64
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HTMLBasicNew() (html HTMLBasicType)
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Image(imageNameStr string, x, y, w, h float64, flow bool, tp string, link int, linkStr string)
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ImageOptions(imageNameStr string, x, y, w, h float64, flow bool, options ImageOptions, link int, linkStr string)
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ImageTypeFromMime(mimeStr string) (tp string)
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LinearGradient(x, y, w, h float64, r1, g1, b1, r2, g2, b2 int, x1, y1, x2, y2 float64)
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LineTo(x, y float64)
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Line(x1, y1, x2, y2 float64)
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LinkString(x, y, w, h float64, linkStr string)
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Link(x, y, w, h float64, link int)
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Ln(h float64)
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MoveTo(x, y float64)
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MultiCell(w, h float64, txtStr, borderStr, alignStr string, fill bool)
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Ok() bool
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OpenLayerPane()
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OutputAndClose(w io.WriteCloser) error
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OutputFileAndClose(fileStr string) error
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Output(w io.Writer) error
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PageCount() int
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PageNo() int
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PageSize(pageNum int) (wd, ht float64, unitStr string)
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PointConvert(pt float64) (u float64)
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PointToUnitConvert(pt float64) (u float64)
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Polygon(points []PointType, styleStr string)
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RadialGradient(x, y, w, h float64, r1, g1, b1, r2, g2, b2 int, x1, y1, x2, y2, r float64)
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RawWriteBuf(r io.Reader)
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RawWriteStr(str string)
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Rect(x, y, w, h float64, styleStr string)
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RegisterAlias(alias, replacement string)
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RegisterImage(fileStr, tp string) (info *ImageInfoType)
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RegisterImageOptions(fileStr string, options ImageOptions) (info *ImageInfoType)
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RegisterImageOptionsReader(imgName string, options ImageOptions, r io.Reader) (info *ImageInfoType)
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RegisterImageReader(imgName, tp string, r io.Reader) (info *ImageInfoType)
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SetAcceptPageBreakFunc(fnc func() bool)
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SetAlpha(alpha float64, blendModeStr string)
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SetAuthor(authorStr string, isUTF8 bool)
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SetAutoPageBreak(auto bool, margin float64)
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SetCatalogSort(flag bool)
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SetCellMargin(margin float64)
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SetCompression(compress bool)
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SetCreationDate(tm time.Time)
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SetCreator(creatorStr string, isUTF8 bool)
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SetDashPattern(dashArray []float64, dashPhase float64)
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SetDisplayMode(zoomStr, layoutStr string)
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SetDrawColor(r, g, b int)
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SetDrawSpotColor(nameStr string, tint byte)
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SetError(err error)
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SetErrorf(fmtStr string, args ...interface{})
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SetFillColor(r, g, b int)
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SetFillSpotColor(nameStr string, tint byte)
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SetFont(familyStr, styleStr string, size float64)
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SetFontLoader(loader FontLoader)
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SetFontLocation(fontDirStr string)
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SetFontSize(size float64)
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SetFontStyle(styleStr string)
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SetFontUnitSize(size float64)
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SetFooterFunc(fnc func())
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SetFooterFuncLpi(fnc func(lastPage bool))
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SetHeaderFunc(fnc func())
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SetHeaderFuncMode(fnc func(), homeMode bool)
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SetHomeXY()
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SetJavascript(script string)
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SetKeywords(keywordsStr string, isUTF8 bool)
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SetLeftMargin(margin float64)
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SetLineCapStyle(styleStr string)
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SetLineJoinStyle(styleStr string)
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SetLineWidth(width float64)
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SetLink(link int, y float64, page int)
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SetMargins(left, top, right float64)
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SetPageBoxRec(t string, pb PageBox)
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SetPageBox(t string, x, y, wd, ht float64)
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SetPage(pageNum int)
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SetProtection(actionFlag byte, userPassStr, ownerPassStr string)
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SetRightMargin(margin float64)
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SetSubject(subjectStr string, isUTF8 bool)
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SetTextColor(r, g, b int)
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SetTextSpotColor(nameStr string, tint byte)
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SetTitle(titleStr string, isUTF8 bool)
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SetTopMargin(margin float64)
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SetUnderlineThickness(thickness float64)
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SetXmpMetadata(xmpStream []byte)
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SetX(x float64)
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SetXY(x, y float64)
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SetY(y float64)
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SplitLines(txt []byte, w float64) [][]byte
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String() string
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SVGBasicWrite(sb *SVGBasicType, scale float64)
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Text(x, y float64, txtStr string)
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TransformBegin()
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TransformEnd()
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TransformMirrorHorizontal(x float64)
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TransformMirrorLine(angle, x, y float64)
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TransformMirrorPoint(x, y float64)
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TransformMirrorVertical(y float64)
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TransformRotate(angle, x, y float64)
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TransformScale(scaleWd, scaleHt, x, y float64)
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TransformScaleX(scaleWd, x, y float64)
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TransformScaleXY(s, x, y float64)
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TransformScaleY(scaleHt, x, y float64)
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TransformSkew(angleX, angleY, x, y float64)
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TransformSkewX(angleX, x, y float64)
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TransformSkewY(angleY, x, y float64)
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||
Transform(tm TransformMatrix)
|
||
TransformTranslate(tx, ty float64)
|
||
TransformTranslateX(tx float64)
|
||
TransformTranslateY(ty float64)
|
||
UnicodeTranslatorFromDescriptor(cpStr string) (rep func(string) string)
|
||
UnitToPointConvert(u float64) (pt float64)
|
||
UseTemplateScaled(t Template, corner PointType, size SizeType)
|
||
UseTemplate(t Template)
|
||
WriteAligned(width, lineHeight float64, textStr, alignStr string)
|
||
Writef(h float64, fmtStr string, args ...interface{})
|
||
Write(h float64, txtStr string)
|
||
WriteLinkID(h float64, displayStr string, linkID int)
|
||
WriteLinkString(h float64, displayStr, targetStr string)
|
||
}
|
||
|
||
// PageBox defines the coordinates and extent of the various page box types
|
||
type PageBox struct {
|
||
SizeType
|
||
PointType
|
||
}
|
||
|
||
// Fpdf is the principal structure for creating a single PDF document
|
||
type Fpdf struct {
|
||
isCurrentUTF8 bool // is current font used in utf-8 mode
|
||
isRTL bool // is is right to left mode enabled
|
||
page int // current page number
|
||
n int // current object number
|
||
offsets []int // array of object offsets
|
||
templates map[string]Template // templates used in this document
|
||
templateObjects map[string]int // template object IDs within this document
|
||
importedObjs map[string][]byte // imported template objects (gofpdi)
|
||
importedObjPos map[string]map[int]string // imported template objects hashes and their positions (gofpdi)
|
||
importedTplObjs map[string]string // imported template names and IDs (hashed) (gofpdi)
|
||
importedTplIDs map[string]int // imported template ids hash to object id int (gofpdi)
|
||
buffer fmtBuffer // buffer holding in-memory PDF
|
||
pages []*bytes.Buffer // slice[page] of page content; 1-based
|
||
state int // current document state
|
||
compress bool // compression flag
|
||
k float64 // scale factor (number of points in user unit)
|
||
defOrientation string // default orientation
|
||
curOrientation string // current orientation
|
||
stdPageSizes map[string]SizeType // standard page sizes
|
||
defPageSize SizeType // default page size
|
||
defPageBoxes map[string]PageBox // default page size
|
||
curPageSize SizeType // current page size
|
||
pageSizes map[int]SizeType // used for pages with non default sizes or orientations
|
||
pageBoxes map[int]map[string]PageBox // used to define the crop, trim, bleed and art boxes
|
||
unitStr string // unit of measure for all rendered objects except fonts
|
||
wPt, hPt float64 // dimensions of current page in points
|
||
w, h float64 // dimensions of current page in user unit
|
||
lMargin float64 // left margin
|
||
tMargin float64 // top margin
|
||
rMargin float64 // right margin
|
||
bMargin float64 // page break margin
|
||
cMargin float64 // cell margin
|
||
x, y float64 // current position in user unit
|
||
lasth float64 // height of last printed cell
|
||
lineWidth float64 // line width in user unit
|
||
fontpath string // path containing fonts
|
||
fontLoader FontLoader // used to load font files from arbitrary locations
|
||
coreFonts map[string]bool // array of core font names
|
||
fonts map[string]fontDefType // array of used fonts
|
||
fontFiles map[string]fontFileType // array of font files
|
||
diffs []string // array of encoding differences
|
||
fontFamily string // current font family
|
||
fontStyle string // current font style
|
||
underline bool // underlining flag
|
||
strikeout bool // strike out flag
|
||
currentFont fontDefType // current font info
|
||
fontSizePt float64 // current font size in points
|
||
fontSize float64 // current font size in user unit
|
||
ws float64 // word spacing
|
||
images map[string]*ImageInfoType // array of used images
|
||
aliasMap map[string]string // map of alias->replacement
|
||
pageLinks [][]linkType // pageLinks[page][link], both 1-based
|
||
links []intLinkType // array of internal links
|
||
attachments []Attachment // slice of content to embed globally
|
||
pageAttachments [][]annotationAttach // 1-based array of annotation for file attachments (per page)
|
||
outlines []outlineType // array of outlines
|
||
outlineRoot int // root of outlines
|
||
autoPageBreak bool // automatic page breaking
|
||
acceptPageBreak func() bool // returns true to accept page break
|
||
pageBreakTrigger float64 // threshold used to trigger page breaks
|
||
inHeader bool // flag set when processing header
|
||
headerFnc func() // function provided by app and called to write header
|
||
headerHomeMode bool // set position to home after headerFnc is called
|
||
inFooter bool // flag set when processing footer
|
||
footerFnc func() // function provided by app and called to write footer
|
||
footerFncLpi func(bool) // function provided by app and called to write footer with last page flag
|
||
zoomMode string // zoom display mode
|
||
layoutMode string // layout display mode
|
||
xmp []byte // XMP metadata
|
||
producer string // producer
|
||
title string // title
|
||
subject string // subject
|
||
author string // author
|
||
keywords string // keywords
|
||
creator string // creator
|
||
creationDate time.Time // override for document CreationDate value
|
||
modDate time.Time // override for document ModDate value
|
||
aliasNbPagesStr string // alias for total number of pages
|
||
pdfVersion string // PDF version number
|
||
fontDirStr string // location of font definition files
|
||
capStyle int // line cap style: butt 0, round 1, square 2
|
||
joinStyle int // line segment join style: miter 0, round 1, bevel 2
|
||
dashArray []float64 // dash array
|
||
dashPhase float64 // dash phase
|
||
blendList []blendModeType // slice[idx] of alpha transparency modes, 1-based
|
||
blendMap map[string]int // map into blendList
|
||
blendMode string // current blend mode
|
||
alpha float64 // current transpacency
|
||
gradientList []gradientType // slice[idx] of gradient records
|
||
clipNest int // Number of active clipping contexts
|
||
transformNest int // Number of active transformation contexts
|
||
err error // Set if error occurs during life cycle of instance
|
||
protect protectType // document protection structure
|
||
layer layerRecType // manages optional layers in document
|
||
catalogSort bool // sort resource catalogs in document
|
||
nJs int // JavaScript object number
|
||
javascript *string // JavaScript code to include in the PDF
|
||
colorFlag bool // indicates whether fill and text colors are different
|
||
color struct {
|
||
// Composite values of colors
|
||
draw, fill, text colorType
|
||
}
|
||
spotColorMap map[string]spotColorType // Map of named ink-based colors
|
||
userUnderlineThickness float64 // A custom user underline thickness multiplier.
|
||
}
|
||
|
||
type encType struct {
|
||
uv int
|
||
name string
|
||
}
|
||
|
||
type encListType [256]encType
|
||
|
||
type fontBoxType struct {
|
||
Xmin, Ymin, Xmax, Ymax int
|
||
}
|
||
|
||
// Font flags for FontDescType.Flags as defined in the pdf specification.
|
||
const (
|
||
// FontFlagFixedPitch is set if all glyphs have the same width (as
|
||
// opposed to proportional or variable-pitch fonts, which have
|
||
// different widths).
|
||
FontFlagFixedPitch = 1 << 0
|
||
// FontFlagSerif is set if glyphs have serifs, which are short
|
||
// strokes drawn at an angle on the top and bottom of glyph stems.
|
||
// (Sans serif fonts do not have serifs.)
|
||
FontFlagSerif = 1 << 1
|
||
// FontFlagSymbolic is set if font contains glyphs outside the
|
||
// Adobe standard Latin character set. This flag and the
|
||
// Nonsymbolic flag shall not both be set or both be clear.
|
||
FontFlagSymbolic = 1 << 2
|
||
// FontFlagScript is set if glyphs resemble cursive handwriting.
|
||
FontFlagScript = 1 << 3
|
||
// FontFlagNonsymbolic is set if font uses the Adobe standard
|
||
// Latin character set or a subset of it.
|
||
FontFlagNonsymbolic = 1 << 5
|
||
// FontFlagItalic is set if glyphs have dominant vertical strokes
|
||
// that are slanted.
|
||
FontFlagItalic = 1 << 6
|
||
// FontFlagAllCap is set if font contains no lowercase letters;
|
||
// typically used for display purposes, such as for titles or
|
||
// headlines.
|
||
FontFlagAllCap = 1 << 16
|
||
// SmallCap is set if font contains both uppercase and lowercase
|
||
// letters. The uppercase letters are similar to those in the
|
||
// regular version of the same typeface family. The glyphs for the
|
||
// lowercase letters have the same shapes as the corresponding
|
||
// uppercase letters, but they are sized and their proportions
|
||
// adjusted so that they have the same size and stroke weight as
|
||
// lowercase glyphs in the same typeface family.
|
||
SmallCap = 1 << 18
|
||
// ForceBold determines whether bold glyphs shall be painted with
|
||
// extra pixels even at very small text sizes by a conforming
|
||
// reader. If the ForceBold flag is set, features of bold glyphs
|
||
// may be thickened at small text sizes.
|
||
ForceBold = 1 << 18
|
||
)
|
||
|
||
// FontDescType (font descriptor) specifies metrics and other
|
||
// attributes of a font, as distinct from the metrics of individual
|
||
// glyphs (as defined in the pdf specification).
|
||
type FontDescType struct {
|
||
// The maximum height above the baseline reached by glyphs in this
|
||
// font (for example for "S"). The height of glyphs for accented
|
||
// characters shall be excluded.
|
||
Ascent int
|
||
// The maximum depth below the baseline reached by glyphs in this
|
||
// font. The value shall be a negative number.
|
||
Descent int
|
||
// The vertical coordinate of the top of flat capital letters,
|
||
// measured from the baseline (for example "H").
|
||
CapHeight int
|
||
// A collection of flags defining various characteristics of the
|
||
// font. (See the FontFlag* constants.)
|
||
Flags int
|
||
// A rectangle, expressed in the glyph coordinate system, that
|
||
// shall specify the font bounding box. This should be the smallest
|
||
// rectangle enclosing the shape that would result if all of the
|
||
// glyphs of the font were placed with their origins coincident
|
||
// and then filled.
|
||
FontBBox fontBoxType
|
||
// The angle, expressed in degrees counterclockwise from the
|
||
// vertical, of the dominant vertical strokes of the font. (The
|
||
// 9-o’clock position is 90 degrees, and the 3-o’clock position
|
||
// is –90 degrees.) The value shall be negative for fonts that
|
||
// slope to the right, as almost all italic fonts do.
|
||
ItalicAngle int
|
||
// The thickness, measured horizontally, of the dominant vertical
|
||
// stems of glyphs in the font.
|
||
StemV int
|
||
// The width to use for character codes whose widths are not
|
||
// specified in a font dictionary’s Widths array. This shall have
|
||
// a predictable effect only if all such codes map to glyphs whose
|
||
// actual widths are the same as the value of the MissingWidth
|
||
// entry. (Default value: 0.)
|
||
MissingWidth int
|
||
}
|
||
|
||
type fontDefType struct {
|
||
Tp string // "Core", "TrueType", ...
|
||
Name string // "Courier-Bold", ...
|
||
Desc FontDescType // Font descriptor
|
||
Up int // Underline position
|
||
Ut int // Underline thickness
|
||
Cw []int // Character width by ordinal
|
||
Enc string // "cp1252", ...
|
||
Diff string // Differences from reference encoding
|
||
File string // "Redressed.z"
|
||
Size1, Size2 int // Type1 values
|
||
OriginalSize int // Size of uncompressed font file
|
||
N int // Set by font loader
|
||
DiffN int // Position of diff in app array, set by font loader
|
||
i string // 1-based position in font list, set by font loader, not this program
|
||
utf8File *utf8FontFile // UTF-8 font
|
||
usedRunes map[int]int // Array of used runes
|
||
}
|
||
|
||
// generateFontID generates a font Id from the font definition
|
||
func generateFontID(fdt fontDefType) (string, error) {
|
||
// file can be different if generated in different instance
|
||
fdt.File = ""
|
||
b, err := json.Marshal(&fdt)
|
||
return fmt.Sprintf("%x", sha1.Sum(b)), err
|
||
}
|
||
|
||
type fontInfoType struct {
|
||
Data []byte
|
||
File string
|
||
OriginalSize int
|
||
FontName string
|
||
Bold bool
|
||
IsFixedPitch bool
|
||
UnderlineThickness int
|
||
UnderlinePosition int
|
||
Widths []int
|
||
Size1, Size2 uint32
|
||
Desc FontDescType
|
||
}
|