b98a2be96b
Normally, assigning to e.g document.body.onload will forward to window.onload. However, in a detached DOM tree, there is no associated window, so we have nowhere to forward to, making this a no-op. The bulk of this change is making Document::window() return a nullable pointer, as documents created by DOMParser or DOMImplementation do not have an associated window object, and so must be able to return null from here.
81 lines
3.4 KiB
C++
81 lines
3.4 KiB
C++
/*
|
||
* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
|
||
*
|
||
* SPDX-License-Identifier: BSD-2-Clause
|
||
*/
|
||
|
||
#include <AK/Optional.h>
|
||
#include <LibGfx/Bitmap.h>
|
||
#include <LibGfx/Rect.h>
|
||
#include <LibWeb/DOM/Document.h>
|
||
#include <LibWeb/DOM/ElementFactory.h>
|
||
#include <LibWeb/HTML/AnimationFrameCallbackDriver.h>
|
||
#include <LibWeb/HTML/BrowsingContext.h>
|
||
#include <LibWeb/HTML/HTMLCanvasElement.h>
|
||
#include <LibWeb/HTML/TagNames.h>
|
||
#include <LibWeb/HTML/TraversableNavigable.h>
|
||
#include <LibWeb/HTML/Window.h>
|
||
#include <LibWeb/Namespace.h>
|
||
#include <LibWeb/Page/Page.h>
|
||
#include <LibWeb/Platform/EventLoopPlugin.h>
|
||
#include <LibWeb/WebDriver/Error.h>
|
||
#include <LibWeb/WebDriver/Screenshot.h>
|
||
|
||
namespace Web::WebDriver {
|
||
|
||
// https://w3c.github.io/webdriver/#dfn-encoding-a-canvas-as-base64
|
||
static Response encode_canvas_element(HTML::HTMLCanvasElement& canvas)
|
||
{
|
||
// FIXME: 1. If the canvas element’s bitmap’s origin-clean flag is set to false, return error with error code unable to capture screen.
|
||
|
||
// 2. If the canvas element’s bitmap has no pixels (i.e. either its horizontal dimension or vertical dimension is zero) then return error with error code unable to capture screen.
|
||
if (canvas.bitmap()->width() == 0 || canvas.bitmap()->height() == 0)
|
||
return Error::from_code(ErrorCode::UnableToCaptureScreen, "Captured screenshot is empty"sv);
|
||
|
||
// 3. Let file be a serialization of the canvas element’s bitmap as a file, using "image/png" as an argument.
|
||
// 4. Let data url be a data: URL representing file. [RFC2397]
|
||
auto data_url = canvas.to_data_url("image/png"sv, {});
|
||
|
||
// 5. Let index be the index of "," in data url.
|
||
auto index = data_url.find_byte_offset(',');
|
||
VERIFY(index.has_value());
|
||
|
||
// 6. Let encoded string be a substring of data url using (index + 1) as the start argument.
|
||
auto encoded_string = MUST(data_url.substring_from_byte_offset(*index + 1));
|
||
|
||
// 7. Return success with data encoded string.
|
||
return JsonValue { move(encoded_string) };
|
||
}
|
||
|
||
// Common animation callback steps between:
|
||
// https://w3c.github.io/webdriver/#take-screenshot
|
||
// https://w3c.github.io/webdriver/#take-element-screenshot
|
||
Response capture_element_screenshot(Painter const& painter, Page& page, DOM::Element& element, Gfx::IntRect& rect)
|
||
{
|
||
Optional<Response> encoded_string_or_error;
|
||
|
||
element.document().window()->animation_frame_callback_driver().add([&](auto) {
|
||
auto viewport_rect = page.top_level_traversable()->viewport_rect();
|
||
rect.intersect(page.enclosing_device_rect(viewport_rect).to_type<int>());
|
||
|
||
auto canvas_element = DOM::create_element(element.document(), HTML::TagNames::canvas, Namespace::HTML).release_value_but_fixme_should_propagate_errors();
|
||
auto& canvas = verify_cast<HTML::HTMLCanvasElement>(*canvas_element);
|
||
|
||
// FIXME: Handle DevicePixelRatio in HiDPI mode.
|
||
MUST(canvas.set_width(rect.width()));
|
||
MUST(canvas.set_height(rect.height()));
|
||
|
||
if (!canvas.create_bitmap(rect.width(), rect.height())) {
|
||
encoded_string_or_error = Error::from_code(ErrorCode::UnableToCaptureScreen, "Unable to create a screenshot bitmap"sv);
|
||
return;
|
||
}
|
||
|
||
painter(rect, *canvas.bitmap());
|
||
encoded_string_or_error = encode_canvas_element(canvas);
|
||
});
|
||
|
||
Platform::EventLoopPlugin::the().spin_until([&]() { return encoded_string_or_error.has_value(); });
|
||
return encoded_string_or_error.release_value();
|
||
}
|
||
|
||
}
|