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implement step 5 of select_image_source

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nupurbaghel 2018-07-20 00:35:06 +05:30
parent e57187305f
commit c881c2a0fb
1 changed files with 25 additions and 7 deletions
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32
components/script/dom/htmlimageelement.rs
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@ -517,14 +517,14 @@ impl HTMLImageElement {
}
}
fn evaluate_source_size_list(&self, source_size_list: &mut SourceSizeList, width: Option<Length>) -> Au {
fn evaluate_source_size_list(&self, source_size_list: &mut SourceSizeList, _width: Option<Length>) -> Au {
let document = document_from_node(self);
let device = document.device();
if !device.is_some() {
return Au(1);
}
let quirks_mode = document.quirks_mode();
source_size_list.set_fallback_value(width);
//FIXME https://github.com/whatwg/html/issues/3832
source_size_list.evaluate(&device.unwrap(), quirks_mode)
}
@ -603,15 +603,33 @@ impl HTMLImageElement {
}
}
}
let mut max = (0f64, 0);
let img_sources = &mut vec![];
for outer_index in 0..len {
if !repeat_indices.contains(&outer_index) {
img_sources.push(&source_set.image_sources[outer_index]);
for (index, image_source) in source_set.image_sources.iter().enumerate() {
if repeat_indices.contains(&index) {
continue;
}
let den = image_source.descriptor.den.unwrap();
if max.0 < den {
max = (den, img_sources.len());
}
img_sources.push(image_source);
}
// TODO Step 5 - select source based on pixel density
let selected_source = img_sources.remove(0).clone();
// Step 5
let mut best_candidate = max;
let device = document_from_node(self).device();
if let Some(device) = device {
let device_den = device.device_pixel_ratio().get() as f64;
for (index, image_source) in img_sources.iter().enumerate() {
let current_den = image_source.descriptor.den.unwrap();
if current_den < best_candidate.0 && current_den >= device_den {
best_candidate = (current_den, index);
}
}
}
let selected_source = img_sources.remove(best_candidate.1).clone();
Some((DOMString::from_string(selected_source.url), selected_source.descriptor.den.unwrap() as f32))
}