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#include "colorizewidget.h"
#include <QtGui/qpainter.h>

ColorizeWidget::ColorizeWidget(QWidget *parent)
    : QWidget(parent)
    , color(255, 100, 0)
{
    if (!context.create())
        qFatal("Could not create OpenCL context");

    program = context.buildProgramFromSourceFile(QLatin1String(":/colorize.cl"));

    QImage img(QLatin1String(":/qtlogo.png"));
    srcImageBuffer = context.createImage2DCopy(img, QCLMemoryObject::ReadOnly);

    dstImage = QImage(img.size(), QImage::Format_ARGB32);
    dstImageBuffer = context.createImage2DDevice(dstImage.format(), dstImage.size(), QCLMemoryObject::WriteOnly);

    colorize = program.createKernel("colorize");
    colorize.setGlobalWorkSize(img.size());
    colorize.setLocalWorkSize(colorize.bestLocalWorkSizeImage2D());
}

ColorizeWidget::~ColorizeWidget()
{
}

void ColorizeWidget::paintEvent(QPaintEvent *)
{
    colorize(srcImageBuffer, dstImageBuffer, color);
    dstImageBuffer.read(&dstImage);
    QPainter painter(this);
    painter.drawImage(0, 0, dstImage);
}