From c9656c429e4d44d06f3eec667d02daa0636cc46e Mon Sep 17 00:00:00 2001
From: Nathan Adams <dinnerbone@dinnerbone.com>
Date: Thu, 23 Feb 2023 03:06:30 +0100
Subject: [PATCH] render: Add Filter::DropShadowFilter

---
 core/src/avm2/filters.rs | 83 +++++++++++++++++++++++++++++++++++++++-
 render/src/filters.rs    | 52 +++++++++++++++++++++++++
 2 files changed, 134 insertions(+), 1 deletion(-)

diff --git a/core/src/avm2/filters.rs b/core/src/avm2/filters.rs
index 9c43bf171..adfb11a25 100644
--- a/core/src/avm2/filters.rs
+++ b/core/src/avm2/filters.rs
@@ -1,6 +1,6 @@
 use ruffle_render::filters::{
     BevelFilter, BevelFilterType, BlurFilter, ColorMatrixFilter, ConvolutionFilter,
-    DisplacementMapFilter, DisplacementMapFilterMode, Filter,
+    DisplacementMapFilter, DisplacementMapFilterMode, DropShadowFilter, Filter,
 };
 use swf::Color;
 
@@ -49,6 +49,11 @@ impl FilterAvm2Ext for Filter {
             return DisplacementMapFilter::from_avm2_object(activation, object);
         }
 
+        let drop_shadow_filter = activation.avm2().classes().dropshadowfilter;
+        if object.is_of_type(drop_shadow_filter, activation) {
+            return DropShadowFilter::from_avm2_object(activation, object);
+        }
+
         Err(Error::AvmError(type_error(
             activation,
             &format!(
@@ -68,6 +73,7 @@ impl FilterAvm2Ext for Filter {
             Filter::ColorMatrixFilter(filter) => filter.as_avm2_object(activation),
             Filter::ConvolutionFilter(filter) => filter.as_avm2_object(activation),
             Filter::DisplacementMapFilter(filter) => filter.as_avm2_object(activation),
+            Filter::DropShadowFilter(filter) => filter.as_avm2_object(activation),
         }
     }
 }
@@ -428,3 +434,78 @@ impl FilterAvm2Ext for DisplacementMapFilter {
         )
     }
 }
+
+impl FilterAvm2Ext for DropShadowFilter {
+    fn from_avm2_object<'gc>(
+        activation: &mut Activation<'_, 'gc>,
+        object: Object<'gc>,
+    ) -> Result<Filter, Error<'gc>> {
+        let alpha = object
+            .get_public_property("alpha", activation)?
+            .coerce_to_number(activation)?;
+        let angle = object
+            .get_public_property("angle", activation)?
+            .coerce_to_number(activation)?;
+        let blur_x = object
+            .get_public_property("blurX", activation)?
+            .coerce_to_number(activation)?;
+        let blur_y = object
+            .get_public_property("blurY", activation)?
+            .coerce_to_number(activation)?;
+        let color = object
+            .get_public_property("color", activation)?
+            .coerce_to_u32(activation)?;
+        let distance = object
+            .get_public_property("distance", activation)?
+            .coerce_to_number(activation)?;
+        let hide_object = object
+            .get_public_property("hideObject", activation)?
+            .coerce_to_boolean();
+        let inner = object
+            .get_public_property("inner", activation)?
+            .coerce_to_boolean();
+        let knockout = object
+            .get_public_property("knockout", activation)?
+            .coerce_to_boolean();
+        let quality = object
+            .get_public_property("quality", activation)?
+            .coerce_to_u32(activation)?;
+        let strength = object
+            .get_public_property("strength", activation)?
+            .coerce_to_u32(activation)?;
+        Ok(Filter::DropShadowFilter(DropShadowFilter {
+            color: Color::from_rgb(color, (alpha * 255.0) as u8),
+            angle: angle as f32,
+            blur_x: blur_x as f32,
+            blur_y: blur_y as f32,
+            distance: distance as f32,
+            hide_object,
+            inner,
+            knockout,
+            strength: strength.clamp(0, 255) as u8,
+            quality: quality.clamp(1, 15) as u8,
+        }))
+    }
+
+    fn as_avm2_object<'gc>(
+        &self,
+        activation: &mut Activation<'_, 'gc>,
+    ) -> Result<Object<'gc>, Error<'gc>> {
+        activation.avm2().classes().dropshadowfilter.construct(
+            activation,
+            &[
+                self.distance.into(),
+                self.angle.into(),
+                self.color.to_rgb().into(),
+                (f64::from(self.color.a) / 255.0).into(),
+                self.blur_x.into(),
+                self.blur_y.into(),
+                self.strength.into(),
+                self.quality.into(),
+                self.inner.into(),
+                self.knockout.into(),
+                self.hide_object.into(),
+            ],
+        )
+    }
+}
diff --git a/render/src/filters.rs b/render/src/filters.rs
index 590155054..396dc0f5a 100644
--- a/render/src/filters.rs
+++ b/render/src/filters.rs
@@ -8,6 +8,7 @@ pub enum Filter {
     ColorMatrixFilter(ColorMatrixFilter),
     ConvolutionFilter(ConvolutionFilter),
     DisplacementMapFilter(DisplacementMapFilter),
+    DropShadowFilter(DropShadowFilter),
 }
 
 impl Default for Filter {
@@ -219,3 +220,54 @@ impl Default for DisplacementMapFilter {
         }
     }
 }
+
+#[derive(Debug, Clone)]
+pub struct DropShadowFilter {
+    pub color: Color,
+    pub angle: f32,
+    pub blur_x: f32,
+    pub blur_y: f32,
+    pub distance: f32,
+    pub hide_object: bool,
+    pub inner: bool,
+    pub knockout: bool,
+    pub quality: u8,
+    pub strength: u8,
+}
+
+impl From<swf::DropShadowFilter> for DropShadowFilter {
+    fn from(value: swf::DropShadowFilter) -> Self {
+        let inner = value.is_inner();
+        let knockout = value.is_knockout();
+        let quality = value.num_passes();
+        DropShadowFilter {
+            color: value.color,
+            angle: value.angle.to_f32(),
+            blur_x: value.blur_x.to_f32(),
+            blur_y: value.blur_y.to_f32(),
+            distance: value.distance.to_f32(),
+            hide_object: false,
+            inner,
+            knockout,
+            quality,
+            strength: (value.strength.to_f32() * 255.0) as u8,
+        }
+    }
+}
+
+impl Default for DropShadowFilter {
+    fn default() -> Self {
+        Self {
+            color: Color::from_rgba(0),
+            angle: 45.0,
+            blur_x: 4.0,
+            blur_y: 4.0,
+            distance: 4.0,
+            hide_object: false,
+            inner: false,
+            knockout: false,
+            quality: 1,
+            strength: 1,
+        }
+    }
+}