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LibWeb: Split out image loading logic from HTMLImageElement

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Since more DOM nodes are going to want to load images (<object>, ...)
this patch splits out the image loading logic into an ImageLoader class
and then HTMLImageElement simply has an ImageLoader.

LayoutImage is then given a const ImageLoader& at construction and can
then provide layout and rendering for many kinds of DOM nodes.
This commit is contained in:
Andreas Kling 2020-06-13 22:22:54 +02:00
parent d6d248c328
commit 95d70addd8
7 changed files with 246 additions and 101 deletions
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3
Libraries/LibWeb/Layout/LayoutDocument.cpp
View file

@ -72,7 +72,8 @@ void LayoutDocument::did_set_viewport_rect(Badge<Frame>, const Gfx::IntRect& a_v
{
Gfx::FloatRect viewport_rect(a_viewport_rect.x(), a_viewport_rect.y(), a_viewport_rect.width(), a_viewport_rect.height());
for_each_in_subtree_of_type<LayoutImage>([&](auto& layout_image) {
const_cast<HTMLImageElement&>(layout_image.node()).set_visible_in_viewport({}, viewport_rect.intersects(layout_image.absolute_rect()));
if (is<HTMLImageElement>(layout_image.node()))
const_cast<HTMLImageElement&>(to<HTMLImageElement>(layout_image.node())).set_visible_in_viewport({}, viewport_rect.intersects(layout_image.absolute_rect()));
return IterationDecision::Continue;
});
}

46
Libraries/LibWeb/Layout/LayoutImage.cpp
View file

@ -24,15 +24,17 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibGfx/Font.h>
#include <LibGfx/StylePainter.h>
#include <LibGUI/Painter.h>
#include <LibGfx/Font.h>
#include <LibGfx/ImageDecoder.h>
#include <LibGfx/StylePainter.h>
#include <LibWeb/Layout/LayoutImage.h>
namespace Web {
LayoutImage::LayoutImage(const HTMLImageElement& element, NonnullRefPtr<StyleProperties> style)
LayoutImage::LayoutImage(const Element& element, NonnullRefPtr<StyleProperties> style, const ImageLoader& image_loader)
: LayoutReplaced(element, move(style))
, m_image_loader(image_loader)
{
}
@ -40,18 +42,31 @@ LayoutImage::~LayoutImage()
{
}
int LayoutImage::preferred_width() const
{
auto* decoder = m_image_loader.image_decoder();
return node().attribute(HTML::AttributeNames::width).to_int().value_or(decoder ? decoder->width() : 0);
}
int LayoutImage::preferred_height() const
{
auto* decoder = m_image_loader.image_decoder();
return node().attribute(HTML::AttributeNames::height).to_int().value_or(decoder ? decoder->height() : 0);
}
void LayoutImage::layout(LayoutMode layout_mode)
{
if (node().preferred_width() && node().preferred_height()) {
if (preferred_width() && preferred_height()) {
set_has_intrinsic_width(true);
set_has_intrinsic_height(true);
set_intrinsic_width(node().preferred_width());
set_intrinsic_height(node().preferred_height());
set_intrinsic_width(preferred_width());
set_intrinsic_height(preferred_height());
} else if (renders_as_alt_text()) {
auto& image_element = to<HTMLImageElement>(node());
auto& font = Gfx::Font::default_font();
auto alt = node().alt();
auto alt = image_element.alt();
if (alt.is_empty())
alt = node().src();
alt = image_element.src();
set_width(font.width(alt) + 16);
set_height(font.glyph_height() + 16);
} else {
@ -74,20 +89,23 @@ void LayoutImage::render(RenderingContext& context)
LayoutReplaced::render(context);
if (renders_as_alt_text()) {
auto& image_element = to<HTMLImageElement>(node());
context.painter().set_font(Gfx::Font::default_font());
Gfx::StylePainter::paint_frame(context.painter(), enclosing_int_rect(absolute_rect()), context.palette(), Gfx::FrameShape::Container, Gfx::FrameShadow::Sunken, 2);
auto alt = node().alt();
auto alt = image_element.alt();
if (alt.is_empty())
alt = node().src();
alt = image_element.src();
context.painter().draw_text(enclosing_int_rect(absolute_rect()), alt, Gfx::TextAlignment::Center, style().color_or_fallback(CSS::PropertyID::Color, document(), Color::Black), Gfx::TextElision::Right);
} else if (node().bitmap())
context.painter().draw_scaled_bitmap(enclosing_int_rect(absolute_rect()), *node().bitmap(), node().bitmap()->rect());
LayoutReplaced::render(context);
} else if (m_image_loader.bitmap()) {
context.painter().draw_scaled_bitmap(enclosing_int_rect(absolute_rect()), *m_image_loader.bitmap(), m_image_loader.bitmap()->rect());
}
}
bool LayoutImage::renders_as_alt_text() const
{
return !node().image_decoder();
if (is<HTMLImageElement>(node()))
return !m_image_loader.image_decoder();
return false;
}
}

9
Libraries/LibWeb/Layout/LayoutImage.h
View file

@ -35,19 +35,24 @@ class HTMLImageElement;
class LayoutImage : public LayoutReplaced {
public:
LayoutImage(const HTMLImageElement&, NonnullRefPtr<StyleProperties>);
LayoutImage(const Element&, NonnullRefPtr<StyleProperties>, const ImageLoader&);
virtual ~LayoutImage() override;
virtual void layout(LayoutMode = LayoutMode::Default) override;
virtual void render(RenderingContext&) override;
const HTMLImageElement& node() const { return static_cast<const HTMLImageElement&>(LayoutReplaced::node()); }
const Element& node() const { return static_cast<const Element&>(LayoutReplaced::node()); }
bool renders_as_alt_text() const;
private:
virtual const char* class_name() const override { return "LayoutImage"; }
virtual bool is_image() const override { return true; }
int preferred_width() const;
int preferred_height() const;
const ImageLoader& m_image_loader;
};
template<>