Add support for GIF

Author: LaurenzV

Cargo.lock

@@ -67,6 +67,7 @@ yoke = { workspace = true }
 float-cmp = { workspace = true }
 zune-png = "0.4.10"
 zune-jpeg = "0.4.13"
+gif = "0.13.1"
 
 [dev-dependencies]
 difference = { workspace = true }

Cargo.toml

@@ -3,6 +3,7 @@ use crate::error::KrillaResult;
 use crate::object::color_space::DEVICE_GRAY;
 use crate::serialize::{FilterStream, Object, SerializerContext};
 use crate::util::{NameExt, Prehashed, SizeWrapper};
+use image::codecs::gif::GifDecoder;
 use pdf_writer::{Chunk, Finish, Name, Ref};
 use std::ops::DerefMut;
 use std::sync::Arc;
@@ -111,6 +112,27 @@ impl Image {
         }))))
     }
 
+    pub fn from_gif(data: &[u8]) -> Option<Self> {
+        let mut decoder = gif::DecodeOptions::new();
+        decoder.set_color_output(gif::ColorOutput::RGBA);
+        let mut decoder = decoder.read_info(data).ok()?;
+        let first_frame = decoder.read_next_frame().ok()??;
+
+        let size = Size::from_wh(first_frame.width as f32, first_frame.height as f32)?;
+
+        let (image_data, mask_data, bits_per_component) =
+            handle_u8_image(first_frame.buffer.to_vec(), ColorSpace::RGBA);
+
+        Some(Self(Arc::new(Prehashed::new(Repr {
+            image_data,
+            mask_data,
+            is_dct_encoded: false,
+            bits_per_component,
+            image_color_space: ImageColorspace::Rgb,
+            size: SizeWrapper(size),
+        }))))
+    }
+
     pub fn size(&self) -> Size {
         self.0.size.0
     }
@@ -142,7 +164,7 @@ impl Object for Image {
 
         let image_stream = if self.0.is_dct_encoded {
             FilterStream::new_from_dct_encoded(&self.0.image_data, &sc.serialize_settings)
-        }   else {
+        } else {
             FilterStream::new_from_binary_data(&self.0.image_data, &sc.serialize_settings)
         };
 

assets/images/rgb8.gif

@@ -92,6 +92,10 @@ pub fn load_jpg_image(name: &str) -> Image {
     Image::from_jpeg(&std::fs::read(ASSETS_PATH.join("images").join(name)).unwrap()).unwrap()
 }
 
+pub fn load_gif_image(name: &str) -> Image {
+    Image::from_gif(&std::fs::read(ASSETS_PATH.join("images").join(name)).unwrap()).unwrap()
+}
+
 fn write_snapshot_to_store(name: &str, content: &[u8]) {
     let mut path = STORE_PATH.clone().join("snapshots");
     let _ = std::fs::create_dir_all(&path);

assets/images/rgba8.gif

@@ -3,7 +3,10 @@ use crate::rgb::Rgb;
 use crate::stream::Glyph;
 use crate::surface::Surface;
 use crate::tests::manual::all_glyphs_to_pdf;
-use crate::tests::{load_png_image, COLR_TEST_GLYPHS, NOTO_COLOR_EMOJI, NOTO_SANS, TWITTER_COLOR_EMOJI, load_jpg_image};
+use crate::tests::{
+    load_gif_image, load_jpg_image, load_png_image, COLR_TEST_GLYPHS, NOTO_COLOR_EMOJI, NOTO_SANS,
+    TWITTER_COLOR_EMOJI,
+};
 use crate::util::SliceExt;
 use crate::{rgb, Fill, LinearGradient, Paint, SpreadMethod, Stop};
 use cosmic_text::{Attrs, Buffer, FontSystem, Metrics, Shaping};
@@ -150,6 +153,12 @@ fn jpg_image_impl(surface: &mut Surface, name: &str) {
     surface.draw_image(image, size);
 }
 
+fn gif_image_impl(surface: &mut Surface, name: &str) {
+    let image = load_gif_image(name);
+    let size = image.size();
+    surface.draw_image(image, size);
+}
+
 #[visreg(all)]
 fn image_luma8_png(surface: &mut Surface) {
     png_image_impl(surface, "luma8.png");
@@ -189,3 +198,13 @@ fn image_luma8_jpg(surface: &mut Surface) {
 fn image_rgb8_jpg(surface: &mut Surface) {
     jpg_image_impl(surface, "rgb8.jpg");
 }
+
+#[visreg(all)]
+fn image_rgb8_gif(surface: &mut Surface) {
+    gif_image_impl(surface, "rgb8.gif");
+}
+
+#[visreg(all)]
+fn image_rgba8_gif(surface: &mut Surface) {
+    gif_image_impl(surface, "rgba8.gif");
+}