54bd322881
When the visible viewport rect changes, we walk the layout tree and check where each LayoutImage is in relation to the viewport rect. Images outside have their bitmaps marked as volatile. Note that the bitmaps are managed by ImageDecoder objects. If a bitmap is purged by the kernel while volatile, we construct a new ImageDecoder next time we need pixels for the image.
44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
#include <LibHTML/Dump.h>
|
|
#include <LibHTML/Frame.h>
|
|
#include <LibHTML/Layout/LayoutDocument.h>
|
|
#include <LibHTML/Layout/LayoutImage.h>
|
|
|
|
LayoutDocument::LayoutDocument(const Document& document, NonnullRefPtr<StyleProperties> style)
|
|
: LayoutBlock(&document, move(style))
|
|
{
|
|
}
|
|
|
|
LayoutDocument::~LayoutDocument()
|
|
{
|
|
}
|
|
|
|
void LayoutDocument::layout()
|
|
{
|
|
ASSERT(document().frame());
|
|
rect().set_width(document().frame()->size().width());
|
|
|
|
LayoutNode::layout();
|
|
|
|
ASSERT(!children_are_inline());
|
|
|
|
int lowest_bottom = 0;
|
|
for_each_child([&](auto& child) {
|
|
ASSERT(is<LayoutBlock>(child));
|
|
auto& child_block = to<LayoutBlock>(child);
|
|
if (child_block.rect().bottom() > lowest_bottom)
|
|
lowest_bottom = child_block.rect().bottom();
|
|
});
|
|
rect().set_bottom(lowest_bottom);
|
|
}
|
|
|
|
void LayoutDocument::did_set_viewport_rect(Badge<Frame>, const Rect& a_viewport_rect)
|
|
{
|
|
FloatRect viewport_rect(a_viewport_rect.x(), a_viewport_rect.y(), a_viewport_rect.width(), a_viewport_rect.height());
|
|
for_each_in_subtree([&](auto& layout_node) {
|
|
if (is<LayoutImage>(layout_node)) {
|
|
auto& image = to<LayoutImage>(layout_node);
|
|
const_cast<HTMLImageElement&>(image.node()).set_volatile({}, !viewport_rect.intersects(image.rect()));
|
|
}
|
|
return IterationDecision::Continue;
|
|
});
|
|
}
|