Clip text to `viewport` bounds instead of layout bounds

2 files changed, 12 insertions, 0 deletions

diff --git a/wgpu/src/layer.rs b/wgpu/src/layer.rs
index 98e49f1a..60da3543 100644
--- a/wgpu/src/layer.rs
+++ b/wgpu/src/layer.rs
@@ -75,6 +75,7 @@ impl<'a> Layer<'a> {
                 horizontal_alignment: alignment::Horizontal::Left,
                 vertical_alignment: alignment::Vertical::Top,
                 shaping: core::text::Shaping::Basic,
+                viewport: Rectangle::with_size(Size::INFINITY),
             };
 
             overlay.text.push(Text::Cached(text.clone()));
@@ -123,6 +124,7 @@ impl<'a> Layer<'a> {
                 paragraph,
                 position,
                 color,
+                viewport,
             } => {
                 let layer = &mut layers[current_layer];
 
@@ -130,12 +132,14 @@ impl<'a> Layer<'a> {
                     paragraph: paragraph.clone(),
                     position: *position + translation,
                     color: *color,
+                    viewport: *viewport + translation,
                 });
             }
             Primitive::Editor {
                 editor,
                 position,
                 color,
+                viewport,
             } => {
                 let layer = &mut layers[current_layer];
 
@@ -143,6 +147,7 @@ impl<'a> Layer<'a> {
                     editor: editor.clone(),
                     position: *position + translation,
                     color: *color,
+                    viewport: *viewport + translation,
                 });
             }
             Primitive::Text {
@@ -155,6 +160,7 @@ impl<'a> Layer<'a> {
                 horizontal_alignment,
                 vertical_alignment,
                 shaping,
+                viewport,
             } => {
                 let layer = &mut layers[current_layer];
 
@@ -168,6 +174,7 @@ impl<'a> Layer<'a> {
                     horizontal_alignment: *horizontal_alignment,
                     vertical_alignment: *vertical_alignment,
                     shaping: *shaping,
+                    viewport: *viewport + translation,
                 }));
             }
             Primitive::Quad {
diff --git a/wgpu/src/layer/text.rs b/wgpu/src/layer/text.rs
index 66417cec..c4ea9185 100644
--- a/wgpu/src/layer/text.rs
+++ b/wgpu/src/layer/text.rs
@@ -13,6 +13,7 @@ pub enum Text<'a> {
         paragraph: paragraph::Weak,
         position: Point,
         color: Color,
+        viewport: Rectangle,
     },
     /// An editor.
     #[allow(missing_docs)]
@@ -20,6 +21,7 @@ pub enum Text<'a> {
         editor: editor::Weak,
         position: Point,
         color: Color,
+        viewport: Rectangle,
     },
     /// A cached text.
     Cached(Cached<'a>),
@@ -53,4 +55,7 @@ pub struct Cached<'a> {
 
     /// The shaping strategy of the text.
     pub shaping: text::Shaping,
+
+    /// The viewport of the text.
+    pub viewport: Rectangle,
 }