84 lines
2.8 KiB
Go
84 lines
2.8 KiB
Go
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/*
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* Copyright (c) 2016 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 tiff allows standard (LZW-compressed) TIFF images to be used in
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// documents generated with gofpdf.
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package tiff
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import (
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"bytes"
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"fmt"
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"image"
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"image/png"
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"io"
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"os"
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"github.com/jung-kurt/gofpdf"
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"golang.org/x/image/tiff"
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)
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// RegisterReader registers a TIFF image, adding it to the PDF file but not
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// adding it to the page. imgName specifies the name that will be used in the
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// call to Image() that actually places the image in the document. options
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// specifies various image properties; in this case, the ImageType property
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// should be set to "tiff". The TIFF image is a reader from the reader
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// specified by r.
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func RegisterReader(fpdf *gofpdf.Fpdf, imgName string, options gofpdf.ImageOptions, r io.Reader) (info *gofpdf.ImageInfoType) {
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var err error
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var img image.Image
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var buf bytes.Buffer
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if fpdf.Ok() {
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if options.ImageType == "tiff" || options.ImageType == "tif" {
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img, err = tiff.Decode(r)
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if err == nil {
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err = png.Encode(&buf, img)
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if err == nil {
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options.ImageType = "png"
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info = fpdf.RegisterImageOptionsReader(imgName, options, &buf)
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}
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}
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} else {
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err = fmt.Errorf("expecting \"tiff\" or \"tif\" as image type, got \"%s\"", options.ImageType)
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}
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if err != nil {
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fpdf.SetError(err)
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}
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}
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return
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}
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// RegisterFile registers a TIFF image, adding it to the PDF file but not
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// adding it to the page. imgName specifies the name that will be used in the
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// call to Image() that actually places the image in the document. options
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// specifies various image properties; in this case, the ImageType property
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// should be set to "tiff". The TIFF image is read from the file specified by
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// tiffFileStr.
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func RegisterFile(fpdf *gofpdf.Fpdf, imgName string, options gofpdf.ImageOptions, tiffFileStr string) (info *gofpdf.ImageInfoType) {
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var f *os.File
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var err error
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if fpdf.Ok() {
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f, err = os.Open(tiffFileStr)
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if err == nil {
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info = RegisterReader(fpdf, imgName, options, f)
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f.Close()
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} else {
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fpdf.SetError(err)
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}
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}
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return
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}
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