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use std::convert::TryFrom;
use std::io;
use swf_types as ast;
use crate::basic_data_types::{emit_s_rgb8, emit_straight_s_rgba8};
use crate::primitives::emit_u8;
fn gradient_spread_to_code(value: ast::GradientSpread) -> u8 {
match value {
ast::GradientSpread::Pad => 0,
ast::GradientSpread::Reflect => 1,
ast::GradientSpread::Repeat => 2,
}
}
fn color_space_to_code(value: ast::ColorSpace) -> u8 {
match value {
ast::ColorSpace::LinearRgb => 1,
ast::ColorSpace::SRgb => 0,
}
}
pub(crate) fn emit_gradient<W: io::Write + ?Sized>(
writer: &mut W,
value: &ast::Gradient,
with_alpha: bool,
) -> io::Result<()> {
assert!(value.colors.len() <= 0x0f);
#[allow(clippy::identity_op)]
let flags: u8 = 0
| ((u8::try_from(value.colors.len()).unwrap() & 0x0f) << 0)
| ((gradient_spread_to_code(value.spread) & 0b11) << 4)
| ((color_space_to_code(value.color_space) & 0b11) << 6);
emit_u8(writer, flags)?;
for color_stop in &value.colors {
emit_color_stop(writer, color_stop, with_alpha)?;
}
Ok(())
}
pub(crate) fn emit_color_stop<W: io::Write + ?Sized>(
writer: &mut W,
value: &ast::ColorStop,
with_alpha: bool,
) -> io::Result<()> {
emit_u8(writer, value.ratio)?;
if with_alpha {
emit_straight_s_rgba8(writer, value.color)
} else {
assert!(value.color.a == u8::max_value());
emit_s_rgb8(
writer,
ast::SRgb8 {
r: value.color.r,
g: value.color.g,
b: value.color.b,
},
)
}
}
pub(crate) fn emit_morph_gradient<W: io::Write + ?Sized>(writer: &mut W, value: &ast::MorphGradient) -> io::Result<()> {
assert!(value.colors.len() <= 0x0f);
#[allow(clippy::identity_op)]
let flags: u8 = 0
| ((u8::try_from(value.colors.len()).unwrap() & 0x0f) << 0)
| ((gradient_spread_to_code(value.spread) & 0b11) << 4)
| ((color_space_to_code(value.color_space) & 0b11) << 6);
emit_u8(writer, flags)?;
for color_stop in &value.colors {
emit_morph_color_stop(writer, color_stop)?;
}
Ok(())
}
pub(crate) fn emit_morph_color_stop<W: io::Write + ?Sized>(
writer: &mut W,
value: &ast::MorphColorStop,
) -> io::Result<()> {
emit_color_stop(
writer,
&ast::ColorStop {
ratio: value.ratio,
color: value.color,
},
true,
)?;
emit_color_stop(
writer,
&ast::ColorStop {
ratio: value.morph_ratio,
color: value.morph_color,
},
true,
)
}