From 17cef8dcee022ca89ccef62eaec23ff6c0e4cdf9 Mon Sep 17 00:00:00 2001
From: Martin Haug <mhaug@live.de>
Date: Tue, 2 May 2023 13:53:20 +0200
Subject: Add ICC profiles to images in PDF and update `usvg`, `svg2pdf` (#822)

---
 src/export/pdf/image.rs | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

(limited to 'src/export/pdf/image.rs')

diff --git a/src/export/pdf/image.rs b/src/export/pdf/image.rs
index 04d4dcc3..dcd5a45a 100644
--- a/src/export/pdf/image.rs
+++ b/src/export/pdf/image.rs
@@ -11,6 +11,7 @@ use crate::image::{DecodedImage, RasterFormat};
 pub fn write_images(ctx: &mut PdfContext) {
     for image in ctx.image_map.items() {
         let image_ref = ctx.alloc.bump();
+        let icc_ref = ctx.alloc.bump();
         ctx.image_refs.push(image_ref);
 
         let width = image.width();
@@ -19,7 +20,7 @@ pub fn write_images(ctx: &mut PdfContext) {
         // Add the primary image.
         // TODO: Error if image could not be encoded.
         match image.decoded() {
-            DecodedImage::Raster(dynamic, format) => {
+            DecodedImage::Raster(dynamic, icc, format) => {
                 // TODO: Error if image could not be encoded.
                 let (data, filter, has_color) = encode_image(*format, dynamic).unwrap();
                 let mut image = ctx.writer.image_xobject(image_ref, &data);
@@ -29,7 +30,9 @@ pub fn write_images(ctx: &mut PdfContext) {
                 image.bits_per_component(8);
 
                 let space = image.color_space();
-                if has_color {
+                if icc.is_some() {
+                    space.icc_based(icc_ref);
+                } else if has_color {
                     space.device_rgb();
                 } else {
                     space.device_gray();
@@ -49,6 +52,21 @@ pub fn write_images(ctx: &mut PdfContext) {
                     mask.height(height as i32);
                     mask.color_space().device_gray();
                     mask.bits_per_component(8);
+                } else {
+                    image.finish();
+                }
+
+                if let Some(icc) = icc {
+                    let compressed = deflate(&icc.0);
+                    let mut stream = ctx.writer.icc_profile(icc_ref, &compressed);
+                    stream.filter(Filter::FlateDecode);
+                    if has_color {
+                        stream.n(3);
+                        stream.alternate().srgb();
+                    } else {
+                        stream.n(1);
+                        stream.alternate().d65_gray();
+                    }
                 }
             }
             DecodedImage::Svg(svg) => {
-- 
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