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****************************************************************************/

#include "imageitem.h"

#include "colors.h"

ImageItem::ImageItem(const QImage &image, int maxWidth, int maxHeight, QGraphicsScene *scene,

        QGraphicsItem *parent, bool adjustSize, float scale) : DemoItem(scene, parent)

{

    this->image = image;

    this->maxWidth = maxWidth;

    this->maxHeight = maxHeight;

    this->adjustSize = adjustSize;

    this->scale = scale;

}

QImage *ImageItem::createImage(const QMatrix &matrix) const

{

    QImage *original = new QImage(image);

    if (original->isNull()){

        return original; // nothing we can do about it...

    }

    QPoint size = matrix.map(QPoint(this->maxWidth, this->maxHeight));

    float w = size.x(); // x, y is the used as width, height

    float h = size.y();

    // Optimization: if image is smaller than maximum allowed size, just return the loaded image

    if (original->size().height() <= h && original->size().width() <= w && !this->adjustSize && this->scale == 1)

        return original;

    // Calculate what the size of the final image will be:

    w = qMin(w, float(original->size().width()) * this->scale);

    h = qMin(h, float(original->size().height()) * this->scale);

    float adjustx = 1.0f;

    float adjusty = 1.0f;

    if (this->adjustSize){

        adjustx = qMin(matrix.m11(), matrix.m22());

        adjusty = matrix.m22() < adjustx ? adjustx : matrix.m22();

        w *= adjustx;

        h *= adjusty;

    }

    // Create a new image with correct size, and draw original on it

    QImage *image = new QImage(int(w+2), int(h+2), QImage::Format_ARGB32_Premultiplied);

    image->fill(QColor(0, 0, 0, 0).rgba());

    QPainter painter(image);

    painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);

    if (this->adjustSize)

        painter.scale(adjustx, adjusty);

    if (this->scale != 1)

       painter.scale(this->scale, this->scale);

    painter.drawImage(0, 0, *original);

    if (!this->adjustSize){

       // Blur out edges

       int blur = 30;

       if (h < original->height()){

           QLinearGradient brush1(0, h - blur, 0, h);

           brush1.setSpread(QGradient::PadSpread);

           brush1.setColorAt(0.0, QColor(0, 0, 0, 0));

           brush1.setColorAt(1.0, Colors::sceneBg1);

           painter.fillRect(0, int(h) - blur, original->width(), int(h), brush1);

       }

       if (w < original->width()){

           QLinearGradient brush2(w - blur, 0, w, 0);

           brush2.setSpread(QGradient::PadSpread);

           brush2.setColorAt(0.0, QColor(0, 0, 0, 0));

           brush2.setColorAt(1.0, Colors::sceneBg1);

           painter.fillRect(int(w) - blur, 0, int(w), original->height(), brush2);

       }

    }

    delete original;

    return image;

}