From f9ddde9937c7b2c043599459877e5a695d667f0e Mon Sep 17 00:00:00 2001
From: Joe Westcott <joewestcott@users.noreply.github.com>
Date: Wed, 4 Sep 2019 15:33:02 +0100
Subject: Initialize derived template with parent images

---
 template.go      | 11 +++++++++++
 template_impl.go |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/template.go b/template.go
index 31204c2..c0d3933 100644
--- a/template.go
+++ b/template.go
@@ -84,7 +84,18 @@ func (f *Fpdf) UseTemplateScaled(t Template, corner PointType, size SizeType) {
 	for _, tt := range t.Templates() {
 		f.templates[tt.ID()] = tt
 	}
+
+	// Create a list of existing image SHA-1 hashes.
+	existingImages := map[string]bool{}
+	for _, image := range f.images {
+		existingImages[image.i] = true
+	}
+
+	// Add each template image to $f, unless already present.
 	for name, ti := range t.Images() {
+		if _, found := existingImages[ti.i]; found {
+			continue
+		}
 		name = sprintf("t%s-%s", t.ID(), name)
 		f.images[name] = ti
 	}
diff --git a/template_impl.go b/template_impl.go
index c5d7be8..c1e2dff 100644
--- a/template_impl.go
+++ b/template_impl.go
@@ -296,4 +296,8 @@ func (t *Tpl) loadParamsFromFpdf(f *Fpdf) {
 	t.Fpdf.fontSizePt = f.fontSizePt
 	t.Fpdf.fontStyle = f.fontStyle
 	t.Fpdf.ws = f.ws
+
+	for key, value := range f.images {
+		t.Fpdf.images[key] = value
+	}
 }
-- 
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