/* * Copyright (c) 2016 Kurt Jung (Gmail: kurt.w.jung) * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ // Package tiff allows standard (LZW-compressed) TIFF images to be used in // documents generated with gofpdf. package tiff import ( "bytes" "fmt" "image" "image/png" "io" "os" "github.com/jung-kurt/gofpdf" "golang.org/x/image/tiff" ) // RegisterReader registers a TIFF image, adding it to the PDF file but not // adding it to the page. imgName specifies the name that will be used in the // call to Image() that actually places the image in the document. options // specifies various image properties; in this case, the ImageType property // should be set to "tiff". The TIFF image is a reader from the reader // specified by r. func RegisterReader(fpdf *gofpdf.Fpdf, imgName string, options gofpdf.ImageOptions, r io.Reader) (info *gofpdf.ImageInfoType) { var err error var img image.Image var buf bytes.Buffer if fpdf.Ok() { if options.ImageType == "tiff" || options.ImageType == "tif" { img, err = tiff.Decode(r) if err == nil { err = png.Encode(&buf, img) if err == nil { options.ImageType = "png" info = fpdf.RegisterImageOptionsReader(imgName, options, &buf) } } } else { err = fmt.Errorf("expecting \"tiff\" or \"tif\" as image type, got \"%s\"", options.ImageType) } if err != nil { fpdf.SetError(err) } } return } // RegisterFile registers a TIFF image, adding it to the PDF file but not // adding it to the page. imgName specifies the name that will be used in the // call to Image() that actually places the image in the document. options // specifies various image properties; in this case, the ImageType property // should be set to "tiff". The TIFF image is read from the file specified by // tiffFileStr. func RegisterFile(fpdf *gofpdf.Fpdf, imgName string, options gofpdf.ImageOptions, tiffFileStr string) (info *gofpdf.ImageInfoType) { var f *os.File var err error if fpdf.Ok() { f, err = os.Open(tiffFileStr) if err == nil { info = RegisterReader(fpdf, imgName, options, f) f.Close() } else { fpdf.SetError(err) } } return }