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Diffstat (limited to 'fpdf.go')
-rw-r--r--fpdf.go23
1 files changed, 22 insertions, 1 deletions
diff --git a/fpdf.go b/fpdf.go
index 1ef2b1f..2cad2e9 100644
--- a/fpdf.go
+++ b/fpdf.go
@@ -4237,6 +4237,7 @@ func implode(sep string, arr []int) string {
return s.String()
}
+// arrayCountValues counts the occurrences of each item in the $mp array.
func arrayCountValues(mp []int) map[int]int {
answer := make(map[int]int)
for _, v := range mp {
@@ -4265,11 +4266,31 @@ func (f *Fpdf) putimages() {
for key = range f.images {
keyList = append(keyList, key)
}
+
+ // Sort the keyList []string by the corresponding image's width.
if f.catalogSort {
sort.SliceStable(keyList, func(i, j int) bool { return f.images[keyList[i]].w < f.images[keyList[j]].w })
}
+
+ // Maintain a list of inserted image SHA-1 hashes, with their
+ // corresponding object ID number.
+ insertedImages := map[string]int{}
+
for _, key = range keyList {
- f.putimage(f.images[key])
+ image := f.images[key]
+
+ // Check if this image has already been inserted using it's SHA-1 hash.
+ insertedImageObjN, isFound := insertedImages[image.i]
+
+ // If found, skip inserting the image as a new object, and
+ // use the object ID from the insertedImages map.
+ // If not, insert the image into the PDF and store the object ID.
+ if isFound {
+ image.n = insertedImageObjN
+ } else {
+ f.putimage(image)
+ insertedImages[image.i] = image.n
+ }
}
}