QGLRectMaskGenerator Class Reference

Inheritance diagram for QGLRectMaskGenerator:

Public Functions
	QGLRectMaskGenerator (const QPainterPath &path, const QTransform &matrix, QGLOffscreen &offscreen, GLuint maskFragmentProgram)
Public Functions inherited from QGLTrapezoidMaskGenerator
void	drawMask (const QRect &rect)
	QGLTrapezoidMaskGenerator (const QPainterPath &path, const QTransform &matrix, QGLOffscreen &offscreen, GLuint maskFragmentProgram, qreal strokeWidth=-1.0)
QRect	screenRect ()
Public Functions inherited from QGLMaskGenerator
QTransform	matrix () const
QPainterPath	path () const
	QGLMaskGenerator (const QPainterPath &path, const QTransform &matrix, qreal stroke_width=-1)
qreal	strokeWidth () const
virtual	~QGLMaskGenerator ()

Private Functions
QRect	computeScreenRect ()
QVector< QGLTrapezoid >	generateTrapezoids ()

Properties
QPainterPath	transformedPath

Detailed Description

Definition at line 3076 of file qpaintengine_opengl.cpp.

Constructors and Destructors

QGLRectMaskGenerator()

QGLRectMaskGenerator::QGLRectMaskGenerator	(	const QPainterPath &	path,
		const QTransform &	matrix,
		QGLOffscreen &	offscreen,
		GLuint	maskFragmentProgram
	)

Definition at line 3205 of file qpaintengine_opengl.cpp.

    : QGLTrapezoidMaskGenerator(path, matrix, offs, program)
{
}

Functions

computeScreenRect()

QRect QGLRectMaskGenerator::computeScreenRect ( )

privatevirtual

Implements QGLTrapezoidMaskGenerator.

Definition at line 3215 of file qpaintengine_opengl.cpp.

{
    transformedPath = matrix().map(path());

    return transformedPath.controlPointRect().adjusted(-1, -1, 1, 1).toAlignedRect();
}

generateTrapezoids()

QVector< QGLTrapezoid > QGLRectMaskGenerator::generateTrapezoids ( )

privatevirtual

Implements QGLTrapezoidMaskGenerator.

Definition at line 3247 of file qpaintengine_opengl.cpp.

{
    Q_ASSERT(transformedPath.elementCount() == 5);

    QOpenGLImmediateModeTessellator tessellator;
    if (matrix().type() <= QTransform::TxScale) {
        QPointF a = transformedPath.elementAt(0);
        QPointF b = transformedPath.elementAt(1);
        QPointF c = transformedPath.elementAt(2);
        QPointF d = transformedPath.elementAt(3);

        QPointF first = (a + d) * 0.5;
        QPointF last = (b + c) * 0.5;

        QPointF delta = a - d;

        // manhattan distance (no rotation)
        qreal width = qAbs(delta.x()) + qAbs(delta.y());

        Q_ASSERT(qFuzzyIsNull(delta.x()) || qFuzzyIsNull(delta.y()));

        tessellator.tessellateRect(first, last, width);
    } else {
        QPointF points[5];

        for (int i = 0; i < 5; ++i)
            points[i] = transformedPath.elementAt(i);

        tessellator.tessellateConvex(points, 5);
    }
    return tessellator.trapezoids;
}

Properties

transformedPath

QPainterPath QGLRectMaskGenerator::transformedPath

private

Definition at line 3085 of file qpaintengine_opengl.cpp.

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The documentation for this class was generated from the following file:

• /src/opengl/qpaintengine_opengl.cpp