1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qwasmdom.h"
#include <QMimeData>
#include <QtCore/qpoint.h>
#include <QtCore/qrect.h>
#include <QtGui/qimage.h>
#include <private/qstdweb_p.h>
#include <utility>
QT_BEGIN_NAMESPACE
namespace dom {
void syncCSSClassWith(emscripten::val element, std::string cssClassName, bool flag)
{
if (flag) {
element["classList"].call<void>("add", emscripten::val(std::move(cssClassName)));
return;
}
element["classList"].call<void>("remove", emscripten::val(std::move(cssClassName)));
}
QPointF mapPoint(emscripten::val source, emscripten::val target, const QPointF &point)
{
const auto sourceBoundingRect =
QRectF::fromDOMRect(source.call<emscripten::val>("getBoundingClientRect"));
const auto targetBoundingRect =
QRectF::fromDOMRect(target.call<emscripten::val>("getBoundingClientRect"));
const auto offset = sourceBoundingRect.topLeft() - targetBoundingRect.topLeft();
return point + offset;
}
void drawImageToWebImageDataArray(const QImage &sourceImage, emscripten::val destinationImageData,
const QRect &sourceRect)
{
Q_ASSERT_X(destinationImageData["constructor"]["name"].as<std::string>() == "ImageData",
Q_FUNC_INFO, "The destination should be an ImageData instance");
constexpr int BytesPerColor = 4;
if (sourceRect.width() == sourceImage.width()) {
// Copy a contiguous chunk of memory
// ...............
// OOOOOOOOOOOOOOO
// OOOOOOOOOOOOOOO -> image data
// OOOOOOOOOOOOOOO
// ...............
auto imageMemory = emscripten::typed_memory_view(sourceRect.width() * sourceRect.height()
* BytesPerColor,
sourceImage.constScanLine(sourceRect.y()));
destinationImageData["data"].call<void>(
"set", imageMemory, sourceRect.y() * sourceImage.width() * BytesPerColor);
} else {
// Go through the scanlines manually to set the individual lines in bulk. This is
// marginally less performant than the above.
// ...............
// ...OOOOOOOOO... r = 0 -> image data
// ...OOOOOOOOO... r = 1 -> image data
// ...OOOOOOOOO... r = 2 -> image data
// ...............
for (int row = 0; row < sourceRect.height(); ++row) {
auto scanlineMemory =
emscripten::typed_memory_view(sourceRect.width() * BytesPerColor,
sourceImage.constScanLine(row + sourceRect.y())
+ BytesPerColor * sourceRect.x());
destinationImageData["data"].call<void>("set", scanlineMemory,
(sourceRect.y() + row) * sourceImage.width()
* BytesPerColor
+ sourceRect.x() * BytesPerColor);
}
}
}
} // namespace dom
QT_END_NAMESPACE
|
