From 7272aa1ddf24bae05b0a451a5dd7826ca4d13235 Mon Sep 17 00:00:00 2001
From: Barpfotenbaer <klaus.wendel@archium.org>
Date: Wed, 3 Mar 2021 09:25:39 +0100
Subject: [PATCH] custom pageSize

---
 fpdf.go | 33 +++++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/fpdf.go b/fpdf.go
index 60c04e9..0246cab 100644
--- a/fpdf.go
+++ b/fpdf.go
@@ -16,10 +16,11 @@
 
 package gofpdf
 
-// Version: 1.7
+// Version: 1.7a1
 // Date:    2011-06-18
 // Author:  Olivier PLATHEY
 // Port to Go: Kurt Jung, 2013-07-15
+// Additions: Klaus Wendel, archium GmbH/Gera, 2021-03-02
 
 import (
 	"bytes"
@@ -57,7 +58,7 @@ func (b *fmtBuffer) printf(fmtStr string, args ...interface{}) {
 	b.Buffer.WriteString(fmt.Sprintf(fmtStr, args...))
 }
 
-func fpdfNew(orientationStr, unitStr, sizeStr, fontDirStr string, size SizeType) (f *Fpdf) {
+func fpdfNew(orientationStr, unitStr, sizeStr, fontDirStr string, size SizeType, density float64) (f *Fpdf) {
 	f = new(Fpdf)
 	if orientationStr == "" {
 		orientationStr = "p"
@@ -74,6 +75,11 @@ func fpdfNew(orientationStr, unitStr, sizeStr, fontDirStr string, size SizeType)
 	if fontDirStr == "" {
 		fontDirStr = "."
 	}
+	// Page density in dpi
+	if density == 0.0 {
+		density = 72.0
+	}
+
 	f.page = 0
 	f.n = 2
 	f.pages = make([]*bytes.Buffer, 0, 8)
@@ -126,11 +132,11 @@ func fpdfNew(orientationStr, unitStr, sizeStr, fontDirStr string, size SizeType)
 	case "pt", "point":
 		f.k = 1.0
 	case "mm":
-		f.k = 72.0 / 25.4
+		f.k = density / 25.4
 	case "cm":
-		f.k = 72.0 / 2.54
+		f.k = density / 2.54
 	case "in", "inch":
-		f.k = 72.0
+		f.k = density
 	default:
 		f.err = fmt.Errorf("incorrect unit %s", unitStr)
 		return
@@ -3006,7 +3012,14 @@ func (f *Fpdf) ImageTypeFromMime(mimeStr string) (tp string) {
 	return
 }
 
-func (f *Fpdf) imageOut(info *ImageInfoType, x, y, w, h float64, allowNegativeX, flow bool, link int, linkStr string) {
+func (f *Fpdf) imageOut(info *ImageInfoType, x, y, w, h float64, allowNegativeX, flow bool, link int, linkStr string, density float64) {
+	/*
+		// density in dpi
+		if density == 0.0 {
+			density = 72.0
+		}
+	*/
+
 	// Automatic width and height calculation if needed
 	if w == 0 && h == 0 {
 		// Put image at 96 dpi
@@ -3024,10 +3037,10 @@ func (f *Fpdf) imageOut(info *ImageInfoType, x, y, w, h float64, allowNegativeX,
 		h = -info.dpi
 	}
 	if w < 0 {
-		w = -info.w * 72.0 / w / f.k
+		w = -info.w * density / w / f.k
 	}
 	if h < 0 {
-		h = -info.h * 72.0 / h / f.k
+		h = -info.h * density / h / f.k
 	}
 	if w == 0 {
 		w = h * info.w / info.h
@@ -3110,7 +3123,7 @@ func (f *Fpdf) Image(imageNameStr string, x, y, w, h float64, flow bool, tp stri
 // If link refers to an internal page anchor (that is, it is non-zero; see
 // AddLink()), the image will be a clickable internal link. Otherwise, if
 // linkStr specifies a URL, the image will be a clickable external link.
-func (f *Fpdf) ImageOptions(imageNameStr string, x, y, w, h float64, flow bool, options ImageOptions, link int, linkStr string) {
+func (f *Fpdf) ImageOptions(imageNameStr string, x, y, w, h float64, flow bool, options ImageOptions, link int, linkStr string, density float64) {
 	if f.err != nil {
 		return
 	}
@@ -3118,7 +3131,7 @@ func (f *Fpdf) ImageOptions(imageNameStr string, x, y, w, h float64, flow bool,
 	if f.err != nil {
 		return
 	}
-	f.imageOut(info, x, y, w, h, options.AllowNegativePosition, flow, link, linkStr)
+	f.imageOut(info, x, y, w, h, options.AllowNegativePosition, flow, link, linkStr, density)
 	return
 }