Merge pull request #1748 from iced-rs/feature/software-renderer

Software renderer, runtime renderer fallback, and core consolidation

1 files changed, 98 insertions, 0 deletions

diff --git a/renderer/src/backend.rs b/renderer/src/backend.rs
new file mode 100644
index 00000000..e77b708b
--- /dev/null
+++ b/renderer/src/backend.rs
@@ -0,0 +1,98 @@
+use crate::core::text;
+use crate::core::{Font, Point, Size};
+use crate::graphics::backend;
+
+use std::borrow::Cow;
+
+#[allow(clippy::large_enum_variant)]
+pub enum Backend {
+    #[cfg(feature = "wgpu")]
+    Wgpu(iced_wgpu::Backend),
+    #[cfg(feature = "tiny-skia")]
+    TinySkia(iced_tiny_skia::Backend),
+}
+
+macro_rules! delegate {
+    ($backend:expr, $name:ident, $body:expr) => {
+        match $backend {
+            #[cfg(feature = "wgpu")]
+            Self::Wgpu($name) => $body,
+            #[cfg(feature = "tiny-skia")]
+            Self::TinySkia($name) => $body,
+        }
+    };
+}
+
+impl iced_graphics::Backend for Backend {
+    fn trim_measurements(&mut self) {
+        delegate!(self, backend, backend.trim_measurements());
+    }
+}
+
+impl backend::Text for Backend {
+    const ICON_FONT: Font = Font::Name("Iced-Icons");
+    const CHECKMARK_ICON: char = '\u{f00c}';
+    const ARROW_DOWN_ICON: char = '\u{e800}';
+
+    fn default_font(&self) -> Font {
+        delegate!(self, backend, backend.default_font())
+    }
+
+    fn default_size(&self) -> f32 {
+        delegate!(self, backend, backend.default_size())
+    }
+
+    fn measure(
+        &self,
+        contents: &str,
+        size: f32,
+        font: Font,
+        bounds: Size,
+    ) -> (f32, f32) {
+        delegate!(self, backend, backend.measure(contents, size, font, bounds))
+    }
+
+    fn hit_test(
+        &self,
+        contents: &str,
+        size: f32,
+        font: Font,
+        bounds: Size,
+        position: Point,
+        nearest_only: bool,
+    ) -> Option<text::Hit> {
+        delegate!(
+            self,
+            backend,
+            backend.hit_test(
+                contents,
+                size,
+                font,
+                bounds,
+                position,
+                nearest_only
+            )
+        )
+    }
+
+    fn load_font(&mut self, font: Cow<'static, [u8]>) {
+        delegate!(self, backend, backend.load_font(font));
+    }
+}
+
+#[cfg(feature = "image")]
+impl backend::Image for Backend {
+    fn dimensions(&self, handle: &crate::core::image::Handle) -> Size<u32> {
+        delegate!(self, backend, backend.dimensions(handle))
+    }
+}
+
+#[cfg(feature = "svg")]
+impl backend::Svg for Backend {
+    fn viewport_dimensions(
+        &self,
+        handle: &crate::core::svg::Handle,
+    ) -> Size<u32> {
+        delegate!(self, backend, backend.viewport_dimensions(handle))
+    }
+}