1 files changed, 121 insertions, 0 deletions
diff --git a/components/shared/net/image/base.rs b/components/shared/net/image/base.rs
new file mode 100644
index 00000000000..74e2d8823dc
--- /dev/null
+++ b/components/shared/net/image/base.rs
@@ -0,0 +1,121 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use std::fmt;
+
+use image::ImageFormat;
+use ipc_channel::ipc::IpcSharedMemory;
+use log::debug;
+use malloc_size_of_derive::MallocSizeOf;
+use pixels::PixelFormat;
+use serde::{Deserialize, Serialize};
+use webrender_api::ImageKey;
+
+use crate::image_cache::CorsStatus;
+
+#[derive(Clone, Deserialize, MallocSizeOf, Serialize)]
+pub struct Image {
+    pub width: u32,
+    pub height: u32,
+    pub format: PixelFormat,
+    #[ignore_malloc_size_of = "Defined in ipc-channel"]
+    pub bytes: IpcSharedMemory,
+    #[ignore_malloc_size_of = "Defined in webrender_api"]
+    pub id: Option<ImageKey>,
+    pub cors_status: CorsStatus,
+}
+
+impl fmt::Debug for Image {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "Image {{ width: {}, height: {}, format: {:?}, ..., id: {:?} }}",
+            self.width, self.height, self.format, self.id
+        )
+    }
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, MallocSizeOf, PartialEq, Serialize)]
+pub struct ImageMetadata {
+    pub width: u32,
+    pub height: u32,
+}
+
+// FIXME: Images must not be copied every frame. Instead we should atomically
+// reference count them.
+
+pub fn load_from_memory(buffer: &[u8], cors_status: CorsStatus) -> Option<Image> {
+    if buffer.is_empty() {
+        return None;
+    }
+
+    let image_fmt_result = detect_image_format(buffer);
+    match image_fmt_result {
+        Err(msg) => {
+            debug!("{}", msg);
+            None
+        },
+        Ok(_) => match image::load_from_memory(buffer) {
+            Ok(image) => {
+                let mut rgba = image.into_rgba8();
+                pixels::rgba8_byte_swap_colors_inplace(&mut *rgba);
+                Some(Image {
+                    width: rgba.width(),
+                    height: rgba.height(),
+                    format: PixelFormat::BGRA8,
+                    bytes: IpcSharedMemory::from_bytes(&*rgba),
+                    id: None,
+                    cors_status,
+                })
+            },
+            Err(e) => {
+                debug!("Image decoding error: {:?}", e);
+                None
+            },
+        },
+    }
+}
+
+// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img
+pub fn detect_image_format(buffer: &[u8]) -> Result<ImageFormat, &str> {
+    if is_gif(buffer) {
+        Ok(ImageFormat::Gif)
+    } else if is_jpeg(buffer) {
+        Ok(ImageFormat::Jpeg)
+    } else if is_png(buffer) {
+        Ok(ImageFormat::Png)
+    } else if is_webp(buffer) {
+        Ok(ImageFormat::WebP)
+    } else if is_bmp(buffer) {
+        Ok(ImageFormat::Bmp)
+    } else if is_ico(buffer) {
+        Ok(ImageFormat::Ico)
+    } else {
+        Err("Image Format Not Supported")
+    }
+}
+
+fn is_gif(buffer: &[u8]) -> bool {
+    buffer.starts_with(b"GIF87a") || buffer.starts_with(b"GIF89a")
+}
+
+fn is_jpeg(buffer: &[u8]) -> bool {
+    buffer.starts_with(&[0xff, 0xd8, 0xff])
+}
+
+fn is_png(buffer: &[u8]) -> bool {
+    buffer.starts_with(&[0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A])
+}
+
+fn is_bmp(buffer: &[u8]) -> bool {
+    buffer.starts_with(&[0x42, 0x4D])
+}
+
+fn is_ico(buffer: &[u8]) -> bool {
+    buffer.starts_with(&[0x00, 0x00, 0x01, 0x00])
+}
+
+fn is_webp(buffer: &[u8]) -> bool {
+    buffer.starts_with(b"RIFF") && buffer.len() >= 14 && &buffer[8..14] == b"WEBPVP"
+}