Auto merge of #10959 - heycam:color, r=bholley

Support color-typed properties in geckolib

This is on top of https://github.com/servo/servo/pull/10957 though I'm not sure how to make that PR's commits not appear in this one.

r? @bholley

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components/style/properties/helpers.mako.rs

@@ -20,6 +20,7 @@
     <%call expr="longhand(name, predefined_type=type, **kwargs)">
         #[allow(unused_imports)]
         use app_units::Au;
+        use cssparser::{Color as CSSParserColor, RGBA};
         pub type SpecifiedValue = specified::${type};
         pub mod computed_value {
             pub use values::computed::${type} as T;

components/style/properties/longhand/svg.mako.rs

@@ -15,12 +15,27 @@ ${helpers.single_keyword("vector-effect", "none non-scaling-stroke", products="g
 
 // Section 13 - Gradients and Patterns
 
+${helpers.predefined_type(
+    "stop-color", "CSSColor",
+    "CSSParserColor::RGBA(RGBA { red: 0.0, green: 0.0, blue: 0.0, alpha: 1.0 })",
+    products="gecko")}
+
 ${helpers.predefined_type("stop-opacity", "Opacity", "1.0", products="gecko")}
 
 // Section 15 - Filter Effects
 
+${helpers.predefined_type(
+    "flood-color", "CSSColor",
+    "CSSParserColor::RGBA(RGBA { red: 0.0, green: 0.0, blue: 0.0, alpha: 1.0 })",
+    products="gecko")}
+
 ${helpers.predefined_type("flood-opacity", "Opacity", "1.0", products="gecko")}
 
+${helpers.predefined_type(
+    "lighting-color", "CSSColor",
+    "CSSParserColor::RGBA(RGBA { red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0 })",
+    products="gecko")}
+
 // CSS Masking Module Level 1
 // https://www.w3.org/TR/css-masking-1/
 ${helpers.single_keyword("mask-type", "luminance alpha", products="gecko")}

components/style/properties/longhand/text.mako.rs

@@ -107,3 +107,8 @@ ${helpers.single_keyword("unicode-bidi", "normal embed isolate bidi-override iso
 ${helpers.single_keyword("text-decoration-style",
                          "-moz-none solid double dotted dashed wavy",
                          products="gecko")}
+
+${helpers.predefined_type(
+    "text-decoration-color", "CSSColor",
+    "CSSParserColor::RGBA(RGBA { red: 0.0, green: 0.0, blue: 0.0, alpha: 1.0 })",
+    products="gecko")}

ports/geckolib/properties.mako.rs

@@ -29,7 +29,7 @@ use style::properties::longhands;
 use style::properties::make_cascade_vec;
 use style::properties::style_struct_traits::*;
 use gecko_style_structs::{nsStyleUnion, nsStyleUnit};
-use values::ToGeckoStyleCoord;
+use values::{ToGeckoStyleCoord, convert_rgba_to_nscolor, convert_nscolor_to_rgba};
 
 #[derive(Clone)]
 pub struct GeckoComputedValues {
@@ -184,6 +184,59 @@ def set_gecko_property(ffi_name, expr):
     }
 </%def>
 
+<%def name="clear_color_flags(color_flags_ffi_name)">
+    % if color_flags_ffi_name:
+    self.gecko.${color_flags_ffi_name} &= !(gecko_style_structs::BORDER_COLOR_SPECIAL as u8);
+    % endif
+</%def>
+
+<%def name="set_current_color_flag(color_flags_ffi_name)">
+    % if color_flags_ffi_name:
+    self.gecko.${color_flags_ffi_name} |= gecko_style_structs::BORDER_COLOR_FOREGROUND as u8;
+    % else:
+    // FIXME(heycam): This is a Gecko property that doesn't store currentColor
+    // as a computed value.  These are currently handled by converting
+    // currentColor to the current value of the color property at computed
+    // value time, but we don't have access to the Color struct here.
+    // In the longer term, Gecko should store currentColor as a computed
+    // value, so that we don't need to do this:
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=760345
+    unimplemented!();
+    % endif
+</%def>
+
+<%def name="get_current_color_flag_from(field)">
+    (${field} & (gecko_style_structs::BORDER_COLOR_FOREGROUND as u8)) != 0
+</%def>
+
+<%def name="impl_color_setter(ident, gecko_ffi_name, color_flags_ffi_name=None)">
+    #[allow(unreachable_code)]
+    fn set_${ident}(&mut self, v: longhands::${ident}::computed_value::T) {
+        use cssparser::Color;
+        ${clear_color_flags(color_flags_ffi_name)}
+        let result = match v {
+            Color::CurrentColor => {
+                ${set_current_color_flag(color_flags_ffi_name)}
+                0
+            },
+            Color::RGBA(rgba) => convert_rgba_to_nscolor(&rgba),
+        };
+        ${set_gecko_property(gecko_ffi_name, "result")}
+    }
+</%def>
+
+<%def name="impl_color_copy(ident, gecko_ffi_name, color_flags_ffi_name=None)">
+    fn copy_${ident}_from(&mut self, other: &Self) {
+        % if color_flags_ffi_name:
+        ${clear_color_flags(color_flags_ffi_name)}
+        if ${get_current_color_flag_from("other.gecko." + color_flags_ffi_name)} {
+            ${set_current_color_flag(color_flags_ffi_name)}
+        }
+        % endif
+        self.gecko.${gecko_ffi_name} = other.gecko.${gecko_ffi_name};
+    }
+</%def>
+
 <%def name="impl_keyword(ident, gecko_ffi_name, keyword, need_clone)">
 <%call expr="impl_keyword_setter(ident, gecko_ffi_name, keyword)"></%call>
 <%call expr="impl_simple_copy(ident, gecko_ffi_name)"></%call>
@@ -197,6 +250,11 @@ def set_gecko_property(ffi_name, expr):
 <%call expr="impl_simple_copy(ident, gecko_ffi_name)"></%call>
 </%def>
 
+<%def name="impl_color(ident, gecko_ffi_name, color_flags_ffi_name=None)">
+<%call expr="impl_color_setter(ident, gecko_ffi_name, color_flags_ffi_name)"></%call>
+<%call expr="impl_color_copy(ident, gecko_ffi_name, color_flags_ffi_name)"></%call>
+</%def>
+
 <%def name="impl_app_units(ident, gecko_ffi_name, need_clone)">
     fn set_${ident}(&mut self, v: longhands::${ident}::computed_value::T) {
         self.gecko.${gecko_ffi_name} = v.0;
@@ -274,7 +332,8 @@ impl Debug for ${style_struct.gecko_ffi_name} {
 
 <%def name="raw_impl_trait(style_struct, skip_longhands='', skip_additionals='')">
 <%
-   longhands = [x for x in style_struct.longhands if not x.name in skip_longhands.split()]
+   longhands = [x for x in style_struct.longhands
+                if not (skip_longhands == "*" or x.name in skip_longhands.split())]
 
    #
    # Make a list of types we can't auto-generate.
@@ -376,7 +435,8 @@ fn static_assert() {
 <% border_style_keyword = Keyword("border-style",
                                   "none solid double dotted dashed hidden groove ridge inset outset") %>
 
-<% skip_border_longhands = " ".join(["border-{0}-style border-{0}-width ".format(x.ident) for x in SIDES]) %>
+<% skip_border_longhands = " ".join(["border-{0}-color border-{0}-style border-{0}-width ".format(x.ident)
+                                     for x in SIDES]) %>
 <%self:impl_trait style_struct_name="Border"
                   skip_longhands="${skip_border_longhands}"
                   skip_additionals="*">
@@ -385,6 +445,9 @@ fn static_assert() {
     <% impl_keyword("border_%s_style" % side.ident, "mBorderStyle[%s]" % side.index, border_style_keyword,
                     need_clone=True) %>
 
+    <% impl_color("border_%s_color" % side.ident, "mBorderColor[%s]" % side.index,
+                  color_flags_ffi_name="mBorderStyle[%s]" % side.index) %>
+
     <% impl_app_units("border_%s_width" % side.ident, "mComputedBorder.%s" % side.ident, need_clone=False) %>
 
     fn border_${side.ident}_has_nonzero_width(&self) -> bool {
@@ -414,11 +477,13 @@ fn static_assert() {
 </%self:impl_trait>
 
 <%self:impl_trait style_struct_name="Outline"
-                  skip_longhands="outline-style"
+                  skip_longhands="outline-color outline-style"
                   skip_additionals="*">
 
     <% impl_keyword("outline_style", "mOutlineStyle", border_style_keyword, need_clone=True) %>
 
+    <% impl_color("outline_color", "mOutlineColor", color_flags_ffi_name="mOutlineStyle") %>
+
     fn outline_has_nonzero_width(&self) -> bool {
         self.gecko.mCachedOutlineWidth != 0
     }
@@ -484,6 +549,61 @@ fn static_assert() {
 
 </%self:impl_trait>
 
+<%self:impl_trait style_struct_name="Background" skip_longhands="background-color" skip_additionals="*">
+
+    <% impl_color("background_color", "mBackgroundColor") %>
+
+</%self:impl_trait>
+
+<%self:impl_trait style_struct_name="Text"
+                  skip_longhands="text-decoration-color"
+                  skip_additionals="*">
+
+    <% impl_color("text_decoration_color", "mTextDecorationColor",
+                  color_flags_ffi_name="mTextDecorationStyle") %>
+
+    fn has_underline(&self) -> bool {
+        use gecko_style_structs as gss;
+        (self.gecko.mTextDecorationStyle & (gss::NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE as u8)) != 0
+    }
+    fn has_overline(&self) -> bool {
+        use gecko_style_structs as gss;
+        (self.gecko.mTextDecorationStyle & (gss::NS_STYLE_TEXT_DECORATION_LINE_OVERLINE as u8)) != 0
+    }
+    fn has_line_through(&self) -> bool {
+        use gecko_style_structs as gss;
+        (self.gecko.mTextDecorationStyle & (gss::NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH as u8)) != 0
+    }
+</%self:impl_trait>
+
+<%self:impl_trait style_struct_name="SVG"
+                  skip_longhands="flood-color lighting-color stop-color"
+                  skip_additionals="*">
+
+    <% impl_color("flood_color", "mFloodColor") %>
+
+    <% impl_color("lighting_color", "mLightingColor") %>
+
+    <% impl_color("stop_color", "mStopColor") %>
+
+</%self:impl_trait>
+
+<%self:impl_trait style_struct_name="Color"
+                  skip_longhands="*">
+
+    fn set_color(&mut self, v: longhands::color::computed_value::T) {
+        let result = convert_rgba_to_nscolor(&v);
+        ${set_gecko_property("mColor", "result")}
+    }
+
+    <%call expr="impl_simple_copy('color', 'mColor')"></%call>
+
+    fn clone_color(&self) -> longhands::color::computed_value::T {
+        let color = ${get_gecko_property("mColor")} as u32;
+        convert_nscolor_to_rgba(color)
+    }
+</%self:impl_trait>
+
 <%def name="define_ffi_struct_accessor(style_struct)">
 #[no_mangle]
 #[allow(non_snake_case, unused_variables)]

ports/geckolib/values.rs

@@ -2,6 +2,7 @@
  * 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 cssparser::RGBA;
 use gecko_style_structs::{nsStyleUnion, nsStyleUnit};
 use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrAuto};
 
@@ -44,3 +45,19 @@ impl ToGeckoStyleCoord for LengthOrPercentageOrAuto {
         };
     }
 }
+
+pub fn convert_rgba_to_nscolor(rgba: &RGBA) -> u32 {
+    (((rgba.alpha * 255.0).round() as u32) << 24) |
+    (((rgba.blue  * 255.0).round() as u32) << 16) |
+    (((rgba.green * 255.0).round() as u32) << 8) |
+     ((rgba.red   * 255.0).round() as u32)
+}
+
+pub fn convert_nscolor_to_rgba(color: u32) -> RGBA {
+    RGBA {
+        red:    ((color        & 0xff) as f32) / 255.0,
+        green: (((color >>  8) & 0xff) as f32) / 255.0,
+        blue:  (((color >> 16) & 0xff) as f32) / 255.0,
+        alpha: (((color >> 24) & 0xff) as f32) / 255.0,
+    }
+}