From e2b37fef33a92a7086790e04fb133472413c0c0a Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Thu, 9 Jan 2025 10:34:16 +0100
Subject: Revamp data loading and deprecate `decode` functions (#5671)

---
 crates/typst-layout/src/image.rs | 54 +++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 28 deletions(-)

(limited to 'crates/typst-layout')

diff --git a/crates/typst-layout/src/image.rs b/crates/typst-layout/src/image.rs
index 59e2c021..e521b993 100644
--- a/crates/typst-layout/src/image.rs
+++ b/crates/typst-layout/src/image.rs
@@ -1,13 +1,13 @@
 use std::ffi::OsStr;
 
-use typst_library::diag::{bail, warning, At, SourceResult, StrResult};
+use typst_library::diag::{warning, At, SourceResult, StrResult};
 use typst_library::engine::Engine;
-use typst_library::foundations::{Packed, Smart, StyleChain};
+use typst_library::foundations::{Bytes, Derived, Packed, Smart, StyleChain};
 use typst_library::introspection::Locator;
 use typst_library::layout::{
     Abs, Axes, FixedAlignment, Frame, FrameItem, Point, Region, Size,
 };
-use typst_library::loading::Readable;
+use typst_library::loading::DataSource;
 use typst_library::text::families;
 use typst_library::visualize::{
     Curve, Image, ImageElem, ImageFit, ImageFormat, RasterFormat, VectorFormat,
@@ -26,17 +26,17 @@ pub fn layout_image(
 
     // Take the format that was explicitly defined, or parse the extension,
     // or try to detect the format.
-    let data = elem.data();
+    let Derived { source, derived: data } = &elem.source;
     let format = match elem.format(styles) {
         Smart::Custom(v) => v,
-        Smart::Auto => determine_format(elem.path().as_str(), data).at(span)?,
+        Smart::Auto => determine_format(source, data).at(span)?,
     };
 
     // Warn the user if the image contains a foreign object. Not perfect
     // because the svg could also be encoded, but that's an edge case.
     if format == ImageFormat::Vector(VectorFormat::Svg) {
         let has_foreign_object =
-            data.as_str().is_some_and(|s| s.contains("<foreignObject"));
+            data.as_str().is_ok_and(|s| s.contains("<foreignObject"));
 
         if has_foreign_object {
             engine.sink.warn(warning!(
@@ -50,7 +50,7 @@ pub fn layout_image(
 
     // Construct the image itself.
     let image = Image::with_fonts(
-        data.clone().into_bytes(),
+        data.clone(),
         format,
         elem.alt(styles),
         engine.world,
@@ -119,25 +119,23 @@ pub fn layout_image(
     Ok(frame)
 }
 
-/// Determine the image format based on path and data.
-fn determine_format(path: &str, data: &Readable) -> StrResult<ImageFormat> {
-    let ext = std::path::Path::new(path)
-        .extension()
-        .and_then(OsStr::to_str)
-        .unwrap_or_default()
-        .to_lowercase();
-
-    Ok(match ext.as_str() {
-        "png" => ImageFormat::Raster(RasterFormat::Png),
-        "jpg" | "jpeg" => ImageFormat::Raster(RasterFormat::Jpg),
-        "gif" => ImageFormat::Raster(RasterFormat::Gif),
-        "svg" | "svgz" => ImageFormat::Vector(VectorFormat::Svg),
-        _ => match &data {
-            Readable::Str(_) => ImageFormat::Vector(VectorFormat::Svg),
-            Readable::Bytes(bytes) => match RasterFormat::detect(bytes) {
-                Some(f) => ImageFormat::Raster(f),
-                None => bail!("unknown image format"),
-            },
-        },
-    })
+/// Try to determine the image format based on the data.
+fn determine_format(source: &DataSource, data: &Bytes) -> StrResult<ImageFormat> {
+    if let DataSource::Path(path) = source {
+        let ext = std::path::Path::new(path.as_str())
+            .extension()
+            .and_then(OsStr::to_str)
+            .unwrap_or_default()
+            .to_lowercase();
+
+        match ext.as_str() {
+            "png" => return Ok(ImageFormat::Raster(RasterFormat::Png)),
+            "jpg" | "jpeg" => return Ok(ImageFormat::Raster(RasterFormat::Jpg)),
+            "gif" => return Ok(ImageFormat::Raster(RasterFormat::Gif)),
+            "svg" | "svgz" => return Ok(ImageFormat::Vector(VectorFormat::Svg)),
+            _ => {}
+        }
+    }
+
+    Ok(ImageFormat::detect(data).ok_or("unknown image format")?)
 }
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