Add basic error handling for images

Author: LaurenzV

crates/krilla/src/chunk_container.rs

@@ -57,7 +57,7 @@ pub struct ChunkContainer {
     pub(crate) shading_functions: Vec<Chunk>,
     pub(crate) patterns: Vec<Chunk>,
     pub(crate) pages: Vec<Deferred<Chunk>>,
-    pub(crate) images: Vec<Deferred<Chunk>>,
+    pub(crate) images: Vec<Deferred<KrillaResult<Chunk>>>,
 
     pub(crate) metadata: Option<Metadata>,
 }
@@ -149,7 +149,7 @@ impl ChunkContainer {
             ($remapper:expr, $pdf:expr; $($field:expr),+) => {
                 $(
                     for chunk in $field {
-                        let chunk = chunk.wait();
+                        let chunk = chunk.wait().res()?;
                         chunk.renumber_into($pdf, |old| *$remapper.get(&old).unwrap());
                     }
                 )+

crates/krilla/src/error.rs

@@ -4,6 +4,7 @@
 //! invalid fonts are provided. This module provides the basic error types krilla uses.
 
 use crate::font::Font;
+use crate::image::Image;
 use crate::validation::ValidationError;
 
 /// A wrapper type for krilla errors.
@@ -22,4 +23,6 @@ pub enum KrillaError {
     ///
     /// [`SerializeSettings`]: crate::SerializeSettings
     ValidationError(Vec<ValidationError>),
+    /// An image couldn't be processed properly.
+    ImageError(Image),
 }

crates/krilla/src/object/image.rs

@@ -10,6 +10,7 @@
 // TODO: CLean up and update docs
 
 use crate::color::{ICCBasedColorSpace, ICCProfile, ICCProfileWrapper, DEVICE_CMYK, DEVICE_RGB};
+use crate::error::{KrillaError, KrillaResult};
 use crate::object::color::DEVICE_GRAY;
 use crate::resource::RegisterableResource;
 use crate::serialize::SerializerContext;
@@ -233,7 +234,11 @@ impl Image {
         self.0.color_space()
     }
 
-    pub(crate) fn serialize(self, sc: &mut SerializerContext, root_ref: Ref) -> Deferred<Chunk> {
+    pub(crate) fn serialize(
+        self,
+        sc: &mut SerializerContext,
+        root_ref: Ref,
+    ) -> Deferred<KrillaResult<Chunk>> {
         let soft_mask_id = sc.new_ref();
         let icc_ref = self.icc().and_then(|ic| {
             if sc
@@ -260,7 +265,12 @@ impl Image {
         Deferred::new(move || {
             let mut chunk = Chunk::new();
 
-            let repr = self.0.inner.wait().as_ref().unwrap();
+            let repr = self
+                .0
+                .inner
+                .wait()
+                .as_ref()
+                .ok_or(KrillaError::ImageError(self.clone()))?;
 
             let alpha_mask = match repr {
                 Repr::Sampled(sampled) => sampled.mask_data.as_ref().map(|mask_data| {
@@ -323,7 +333,7 @@ impl Image {
             }
             image_x_object.finish();
 
-            chunk
+            Ok(chunk)
         })
     }
 }