Merge pull request #134 from dnlmlr/remove-unused-fonts

Don't include unused fonts in the PDF document

Cargo.toml

@@ -11,7 +11,7 @@ keywords = ["pdf", "gui", "graphics", "wkhtmltopdf"]
 categories = ["gui"]
 exclude = ["./assets/*", "./doc/*", "./examples/*"]
 autoexamples = false
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 # minimum dependencies
@@ -35,6 +35,7 @@ image = { version = "0.24.3", optional = true, default-features = false, feature
 svg2pdf = { version = "0.1.0", optional = true }
 pdf-writer = { version = "0.4.1", optional = true }
 usvg = { version = "0.19.0", optional = true }
+allsorts = { version = "0.14", optional = true, default-features = false, features = ["flate2_rust"]  }
 
 [features]
 default = []
@@ -54,6 +55,7 @@ dds = ["image/dds", "embedded_images"]
 webp = ["image/webp", "embedded_images"]
 # enables svg
 svg = ["svg2pdf", "usvg", "pdf-writer"]
+font_subsetting = ["dep:allsorts"]
 
 [package.metadata.docs.rs]
 all-features = true

src/document_info.rs

@@ -1,8 +1,8 @@
 //! Info dictionary of a PDF document
 
 use crate::OffsetDateTime;
-use lopdf;
 use crate::PdfMetadata;
+use lopdf;
 /// "Info" dictionary of a PDF document.
 /// Actual data is contained in `DocumentMetadata`, to keep it in sync with the `XmpMetadata`
 /// (if the timestamps / settings are not in sync, Preflight will complain)
@@ -64,7 +64,6 @@ impl DocumentInfo {
         use lopdf::Dictionary as LoDictionary;
         use lopdf::Object::*;
         use lopdf::StringFormat::Literal;
-        use std::iter::FromIterator;
 
         let trapping = if m.trapping { "True" } else { "False" };
         let gts_pdfx_version = m.conformance.get_identifier_string();

src/extgstate.rs

@@ -565,7 +565,6 @@ impl From<ExtendedGraphicsState> for lopdf::Object {
     /// comparison to the previous one are returned.
 
     fn from(val: ExtendedGraphicsState) -> Self {
-        use std::iter::FromIterator;
         let mut gs_operations = Vec::<(String, lopdf::Object)>::new();
 
         // for each field, look if it was contained in the "changed fields"
@@ -841,7 +840,6 @@ impl HalftoneType {
     }
 
     pub fn into_obj(self) -> Vec<lopdf::Object> {
-        use std::iter::FromIterator;
         vec![Dictionary(lopdf::Dictionary::from_iter(vec![
             ("Type", "Halftone".into()),
             ("HalftoneType", self.get_type().into()),