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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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101
Libraries/LibWeb/Loader/ImageLoader.cpp Normal file
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@ -0,0 +1,101 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibGfx/Bitmap.h>
#include <LibGfx/ImageDecoder.h>
#include <LibWeb/Loader/ImageLoader.h>
#include <LibWeb/Loader/ResourceLoader.h>
namespace Web {
ImageLoader::ImageLoader()
{
}
void ImageLoader::load(const URL& url)
{
LoadRequest request;
request.set_url(url);
set_resource(ResourceLoader::the().load_resource(Resource::Type::Image, request));
}
void ImageLoader::set_visible_in_viewport(bool visible_in_viewport)
{
if (m_visible_in_viewport == visible_in_viewport)
return;
m_visible_in_viewport = visible_in_viewport;
// FIXME: Don't update volatility every time. If we're here, we're probably scanning through
// the whole document, updating "is visible in viewport" flags, and this could lead
// to the same bitmap being marked volatile back and forth unnecessarily.
if (resource())
resource()->update_volatility();
}
void ImageLoader::resource_did_load()
{
ASSERT(resource());
if (!resource()->mime_type().starts_with("image/")) {
if (on_fail)
on_fail();
return;
}
if (!resource()->has_encoded_data()) {
dbg() << "ImageLoader: Resource did load, no encoded data. URL: " << resource()->url();
} else {
dbg() << "ImageLoader: Resource did load, has encoded data. URL: " << resource()->url();
}
m_decoder = resource()->ensure_decoder();
if (on_load)
on_load();
}
void ImageLoader::resource_did_fail()
{
dbg() << "ImageLoader: Resource did fail. URL: " << resource()->url();
if (on_fail)
on_fail();
}
void ImageLoader::resource_did_replace_decoder()
{
m_decoder = resource()->ensure_decoder();
}
const Gfx::Bitmap* ImageLoader::bitmap() const
{
return m_decoder ? m_decoder->bitmap() : nullptr;
}
const Gfx::ImageDecoder* ImageLoader::image_decoder() const
{
return m_decoder;
}
}