#include "tgl.h"

//Qt includes

#include <qpixmap></qpixmap>

#include <qimage></qimage>

#include <qglwidget></qglwidget>

#include <qdesktopwidget></qdesktopwidget>

#include <qapplication></qapplication>

#include "toonzqt/pickrgbutils.h"

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

//    Local namespace

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

namespace

{

QRgb meanColor(const QImage &img, const QRect &rect)

{

	if (rect.width() == 1 && rect.height() == 1)

		return img.pixel(rect.left(), rect.top());

	int r, g, b, m;

	int x, y, x1 = rect.right(), y1 = rect.bottom(), count = rect.width() * rect.height();

	r = g = b = m = 0;

	for (y = rect.top(); y <= y1; ++y)

		for (x = rect.left(); x <= x1; ++x) {

			QRgb color = img.pixel(x, y);

			r += (color & 0xff);

			g += ((color >> 8) & 0xff);

			b += ((color >> 16) & 0xff);

			m += ((color >> 24) & 0xff);

		}

	r = r / count;

	g = g / count;

	b = b / count;

	m = m / count;

	return r | (g << 8) | (b << 16) | (m << 24);

}

}

//==============================================================================

QRgb pickRGB(QWidget *widget, const QRect &rect)

{

	QImage img(QPixmap::grabWidget(widget, rect.x(), rect.y(), rect.width(), rect.height()).toImage());

	return meanColor(img, img.rect());

}

//------------------------------------------------------------------------------

QRgb pickScreenRGB(const QRect &rect)

{

	QWidget *widget = QApplication::desktop();

#ifdef MACOSX

	//   #Bugzilla 6514, possibly related to #QTBUG 23516

	// Screen grabbing on a secondary screen seems to be broken on MAC

	// (see what happens using PixelTool), when no piece of the *primary*

	// screen is involved in the grab. As it seems to be very Qt-based,

	// the workaround is to trivially grab the smallest rect including the

	// requested one and a part of the primary screen.

	const QRect &screen0Geom = QApplication::desktop()->screenGeometry(0);

	int left = tmin(rect.left(), screen0Geom.right());

	int top = tmin(rect.top(), screen0Geom.bottom());

	int right = tmax(rect.right(), screen0Geom.left());

	int bottom = tmax(rect.bottom(), screen0Geom.right());

	QRect theRect(QPoint(left, top), QPoint(right, bottom));

#else

	const QRect &theRect = rect;

#endif

	QImage img(QPixmap::grabWindow(widget->winId(), theRect.x(), theRect.y(), theRect.width(), theRect.height()).toImage());

	return meanColor(img, QRect(rect.left() - theRect.left(), rect.top() - theRect.top(), rect.width(), rect.height()));

}

//------------------------------------------------------------------------------

QRgb pickRGB(QGLWidget *widget, const QRect &rect)

{

	widget->makeCurrent();

	glReadBuffer(GL_FRONT);

	QImage img(rect.size(), QImage::Format_ARGB32);

	glReadPixels(rect.x(), widget->height() - rect.y(), rect.width(), rect.height(),

				 GL_BGRA_EXT, GL_UNSIGNED_BYTE, img.bits());

	widget->doneCurrent();

	return meanColor(img, img.rect());

}