MagickUtilities.cpp

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// Copyright (c) 2008-2021 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#ifdef USE_IMAGEMAGICK
 
#include "MagickUtilities.h"
#include "QtUtilities.h"
 
#include <QImage>
 
// Get pointer to Magick::Image conversion of a QImage
std::shared_ptr<Magick::Image>
openshot::QImage2Magick(std::shared_ptr<QImage> image)
{
    // Check for blank image
    if (!image || image->isNull())
        return nullptr;
 
    // Get the pixels from the frame image
    const QRgb *tmpBits = (const QRgb*)image->constBits();
 
    // Create new image object, and fill with pixel data
    auto magick_image = std::make_shared<Magick::Image>(
        image->width(), image->height(),
        "RGBA", Magick::CharPixel, tmpBits);
 
    // Give image a transparent background color
    magick_image->backgroundColor(Magick::Color("none"));
    magick_image->virtualPixelMethod(
        Magick::TransparentVirtualPixelMethod);
    MAGICK_IMAGE_ALPHA(magick_image, true);
 
    return magick_image;
}
 
// Get pointer to QImage conversion of a Magick::Image
std::shared_ptr<QImage>
openshot::Magick2QImage(std::shared_ptr<Magick::Image> image)
{
    if (!image)
        return nullptr;
 
    const int BPP = 4;
    const std::size_t size = image->columns() * image->rows() * BPP;
 
    auto* qbuffer = new unsigned char[size]();
 
    MagickCore::ExceptionInfo exception;
    // TODO: Actually do something, if we get an exception here
    MagickCore::ExportImagePixels(
        image->constImage(), 0, 0,
        image->columns(), image->rows(),
        "RGBA", Magick::CharPixel,
        qbuffer, &exception);
 
    auto qimage = std::make_shared<QImage>(
        qbuffer, image->columns(), image->rows(),
        image->columns() * BPP,
        QImage::Format_RGBA8888_Premultiplied,
        (QImageCleanupFunction) &openshot::cleanUpBuffer,
        (void*) qbuffer);
    return qimage;
}
 
#endif  // USE_IMAGEMAGICK