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layout: Implement image-rendering per CSS-IMAGES-3 § 5.3 and

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`background-size` per CSS-BACKGROUNDS § 3.9.

Nearest neighbor interpolation is used for `crisp-edges`, like Firefox.
A note has been added that we could do better if we wanted to.

Multiple backgrounds are not yet supported.
This commit is contained in:
Patrick Walton 2014-12-13 19:09:06 -08:00 • committed by Simon Sapin
parent 6fcc02e92f
commit 09c53f461d
16 changed files with 521 additions and 34 deletions
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11
components/gfx/display_list/mod.rs
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@ -42,8 +42,9 @@ use util::smallvec::{SmallVec, SmallVec8};
use std::fmt;
use std::slice::Iter;
use std::sync::Arc;
use style::computed_values::{border_style, cursor, filter, image_rendering, mix_blend_mode};
use style::computed_values::{pointer_events};
use style::properties::ComputedValues;
use style::computed_values::{border_style, cursor, filter, mix_blend_mode, pointer_events};
// It seems cleaner to have layout code not mention Azure directly, so let's just reexport this for
// layout to use.
@ -763,6 +764,10 @@ pub struct ImageDisplayItem {
/// the bounds of this display item, then the image will be repeated in the appropriate
/// direction to tile the entire bounds.
pub stretch_size: Size2D<Au>,
/// The algorithm we should use to stretch the image. See `image_rendering` in CSS-IMAGES-3 §
/// 5.3.
pub image_rendering: image_rendering::T,
}
/// Paints a gradient.
@ -937,7 +942,9 @@ impl DisplayItem {
bounds.origin.y = bounds.origin.y + y_offset;
bounds.size = image_item.stretch_size;
paint_context.draw_image(&bounds, image_item.image.clone());
paint_context.draw_image(&bounds,
image_item.image.clone(),
image_item.image_rendering.clone());
x_offset = x_offset + image_item.stretch_size.width;
}