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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* viewfinder_qt.cpp - qcam - QPainter-based ViewFinder
*/
#include "viewfinder_qt.h"
#include <stdint.h>
#include <utility>
#include <QImage>
#include <QImageWriter>
#include <QMap>
#include <QMutexLocker>
#include <QPainter>
#include <QtDebug>
#include <libcamera/formats.h>
#include "format_converter.h"
static const QMap<libcamera::PixelFormat, QImage::Format> nativeFormats
{
#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
{ libcamera::formats::ABGR8888, QImage::Format_RGBA8888 },
#endif
{ libcamera::formats::ARGB8888, QImage::Format_RGB32 },
#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
{ libcamera::formats::RGB888, QImage::Format_BGR888 },
#endif
{ libcamera::formats::BGR888, QImage::Format_RGB888 },
};
ViewFinderQt::ViewFinderQt(QWidget *parent)
: QWidget(parent), buffer_(nullptr)
{
icon_ = QIcon(":camera-off.svg");
}
ViewFinderQt::~ViewFinderQt()
{
}
const QList<libcamera::PixelFormat> &ViewFinderQt::nativeFormats() const
{
static const QList<libcamera::PixelFormat> formats = ::nativeFormats.keys();
return formats;
}
int ViewFinderQt::setFormat(const libcamera::PixelFormat &format,
const QSize &size)
{
image_ = QImage();
/*
* If format conversion is needed, configure the converter and allocate
* the destination image.
*/
if (!::nativeFormats.contains(format)) {
int ret = converter_.configure(format, size);
if (ret < 0)
return ret;
image_ = QImage(size, QImage::Format_RGB32);
qInfo() << "Using software format conversion from"
<< format.toString().c_str();
} else {
qInfo() << "Zero-copy enabled";
}
format_ = format;
size_ = size;
updateGeometry();
return 0;
}
void ViewFinderQt::render(libcamera::FrameBuffer *buffer, MappedBuffer *map)
{
if (buffer->planes().size() != 1) {
qWarning() << "Multi-planar buffers are not supported";
return;
}
unsigned char *memory = static_cast<unsigned char *>(map->memory);
size_t size = buffer->metadata().planes[0].bytesused;
{
QMutexLocker locker(&mutex_);
if (::nativeFormats.contains(format_)) {
/*
* If the frame format is identical to the display
* format, create a QImage that references the frame
* and store a reference to the frame buffer. The
* previously stored frame buffer, if any, will be
* released.
*
* \todo Get the stride from the buffer instead of
* computing it naively
*/
image_ = QImage(memory, size_.width(), size_.height(),
size / size_.height(),
::nativeFormats[format_]);
std::swap(buffer, buffer_);
} else {
/*
* Otherwise, convert the format and release the frame
* buffer immediately.
*/
converter_.convert(memory, size, &image_);
}
}
update();
if (buffer)
renderComplete(buffer);
}
void ViewFinderQt::stop()
{
image_ = QImage();
if (buffer_) {
renderComplete(buffer_);
buffer_ = nullptr;
}
update();
}
QImage ViewFinderQt::getCurrentImage()
{
QMutexLocker locker(&mutex_);
return image_.copy();
}
void ViewFinderQt::paintEvent(QPaintEvent *)
{
QPainter painter(this);
/* If we have an image, draw it. */
if (!image_.isNull()) {
painter.drawImage(rect(), image_, image_.rect());
return;
}
/*
* Otherwise, draw the camera stopped icon. Render it to the pixmap if
* the size has changed.
*/
constexpr int margin = 20;
if (vfSize_ != size() || pixmap_.isNull()) {
QSize vfSize = size() - QSize{ 2 * margin, 2 * margin };
QSize pixmapSize{ 1, 1 };
pixmapSize.scale(vfSize, Qt::KeepAspectRatio);
pixmap_ = icon_.pixmap(pixmapSize);
vfSize_ = size();
}
QPoint point{ margin, margin };
if (pixmap_.width() < width() - 2 * margin)
point.setX((width() - pixmap_.width()) / 2);
else
point.setY((height() - pixmap_.height()) / 2);
painter.setBackgroundMode(Qt::OpaqueMode);
painter.drawPixmap(point, pixmap_);
}
QSize ViewFinderQt::sizeHint() const
{
return size_.isValid() ? size_ : QSize(640, 480);
}
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