1 files changed, 68 insertions, 0 deletions
diff --git a/gfx/wr/webrender/src/pattern.rs b/gfx/wr/webrender/src/pattern.rs
new file mode 100644
index 0000000000..36a06fa2b9
--- /dev/null
+++ b/gfx/wr/webrender/src/pattern.rs
@@ -0,0 +1,68 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+use api::{ColorF, PremultipliedColorF};
+
+#[repr(u32)]
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+pub enum PatternKind {
+    ColorOrTexture = 0,
+
+    Mask = 1,
+    // When adding patterns, don't forget to update the NUM_PATTERNS constant.
+}
+
+pub const NUM_PATTERNS: u32 = 2;
+
+impl PatternKind {
+    pub fn from_u32(val: u32) -> Self {
+        assert!(val < NUM_PATTERNS);
+        unsafe { std::mem::transmute(val) }
+    }
+}
+
+/// A 32bit payload used as input for the pattern-specific logic in the shader.
+///
+/// Patterns typically use it as a GpuBuffer offset to fetch their data.
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+pub struct PatternShaderInput(pub i32, pub i32);
+
+impl Default for PatternShaderInput {
+    fn default() -> Self {
+        PatternShaderInput(0, 0)
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+pub struct Pattern {
+    pub kind: PatternKind,
+    pub shader_input: PatternShaderInput,
+    pub base_color: PremultipliedColorF,
+    pub is_opaque: bool,
+}
+
+impl Pattern {
+    pub fn color(color: ColorF) -> Self {
+        Pattern {
+            kind: PatternKind::ColorOrTexture,
+            shader_input: PatternShaderInput::default(),
+            base_color: color.premultiplied(),
+            is_opaque: color.a >= 1.0,
+        }
+    }
+
+    pub fn clear() -> Self {
+        // Opaque black with operator dest out
+        Pattern {
+            kind: PatternKind::ColorOrTexture,
+            shader_input: PatternShaderInput::default(),
+            base_color: PremultipliedColorF::BLACK,
+            is_opaque: false,
+        }
+    }
+}