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Auto merge of #6035 - Jinwoo-Song:fix_background_image_position, r=pcwalton

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According to CSS2.1 spec, background image should be positioned on padding box.
Spec: http://www.w3.org/TR/CSS21/colors.html#propdef-background-position

Fixes #6034.

r? @jdm 
cc @yichoi

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This commit is contained in:
bors-servo 2015-05-13 20:40:33 -05:00
commit e25444c263
3 changed files with 49 additions and 2 deletions
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7
components/layout/display_list_builder.rs
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@ -435,8 +435,11 @@ impl FragmentDisplayListBuilding for Fragment {
let vertical_position = model::specified(background.background_position.vertical,
bounds.size.height - image_size.height);
let abs_x = virtual_origin_x + horizontal_position;
let abs_y = virtual_origin_y + vertical_position;
// Background image should be positioned on the padding box basis.
let border = style.logical_border_width().to_physical(style.writing_mode);
let abs_x = border.left + virtual_origin_x + horizontal_position;
let abs_y = border.top + virtual_origin_y + vertical_position;
// Adjust origin and size based on background-repeat
match background.background_repeat {