Enum SimulationMode 

pub enum SimulationMode {
    Accurate,
    DownsampleOnly,
}

How to handle image scaling during viewing simulation.

When calculating perceptual metrics, we need to simulate how images appear on different devices. This affects whether we resample images or adjust metric thresholds.

Variants

Accurate

Simulate browser behavior exactly.

• Undersized images (ratio < 1): Upsample to simulate browser upscaling
• Oversized images (ratio > 1): Downsample to simulate browser downscaling

This matches real-world viewing but introduces resampling artifacts that may affect metric accuracy.

DownsampleOnly

Never upsample, only downsample.

• Undersized images: Keep at native resolution, adjust effective PPD
• Oversized images: Downsample normally

This avoids introducing upsampling artifacts in the simulation. The effective PPD is adjusted to account for the missing upscale, making metric thresholds more lenient for undersized images.

Trait Implementations

impl Clone for SimulationMode

fn clone(&self) -> SimulationMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SimulationMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SimulationMode

fn default() -> SimulationMode

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SimulationMode

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for SimulationMode

fn eq(&self, other: &SimulationMode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for SimulationMode

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for SimulationMode

impl Eq for SimulationMode

impl StructuralPartialEq for SimulationMode