QGLTrapezoidMaskGenerator Class Reference

Inheritance diagram for QGLTrapezoidMaskGenerator:

Public Functions
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
virtual QRect	computeScreenRect ()=0
virtual QVector< QGLTrapezoid >	generateTrapezoids ()=0

Properties
bool	has_screen_rect
GLuint	maskFragmentProgram
QGLOffscreen *	offscreen
QRect	screen_rect

Detailed Description

Definition at line 3032 of file qpaintengine_opengl.cpp.

Constructors and Destructors

QGLTrapezoidMaskGenerator()

QGLTrapezoidMaskGenerator::QGLTrapezoidMaskGenerator	(	const QPainterPath &	path,
		const QTransform &	matrix,
		QGLOffscreen &	offscreen,
		GLuint	maskFragmentProgram,
		qreal	strokeWidth = -1.0
	)

Definition at line 3110 of file qpaintengine_opengl.cpp.

    : QGLMaskGenerator(path, matrix, stroke_width)
    ,  has_screen_rect(false)
    ,  offscreen(&offs)
    ,  maskFragmentProgram(program)
{
}

Functions

computeScreenRect()

virtual QRect QGLTrapezoidMaskGenerator::computeScreenRect ( )

privatepure virtual

Implemented in QGLRectMaskGenerator, QGLLineMaskGenerator, and QGLPathMaskGenerator.

Referenced by screenRect().

drawMask()

void QGLTrapezoidMaskGenerator::drawMask ( const QRect &  rect )

virtual

Implements QGLMaskGenerator.

Definition at line 3121 of file qpaintengine_opengl.cpp.

{
#ifdef QT_OPENGL_ES
    Q_UNUSED(rect);
#else
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();

    QGLContext *ctx = offscreen->context();
    offscreen->bind();

    glDisable(GL_TEXTURE_GEN_S);
    glDisable(GL_TEXTURE_1D);

    GLfloat vertexArray[4 * 2];
    qt_add_rect_to_array(rect, vertexArray);

    bool needs_scissor = rect != screen_rect;

    if (needs_scissor) {
        glEnable(GL_SCISSOR_TEST);
        glScissor(rect.left(), offscreen->offscreenSize().height() - rect.bottom() - 1, rect.width(), rect.height());
    }

    QVector<QGLTrapezoid> trapezoids = generateTrapezoids();

    // clear mask
    glBlendFunc(GL_ZERO, GL_ZERO); // clear
    glVertexPointer(2, GL_FLOAT, 0, vertexArray);
    glEnableClientState(GL_VERTEX_ARRAY);
    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
    glDisableClientState(GL_VERTEX_ARRAY);

    glBlendFunc(GL_ONE, GL_ONE); // add mask
    glEnable(GL_FRAGMENT_PROGRAM_ARB);
    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, maskFragmentProgram);

    QPoint delta = rect.topLeft() - screen_rect.topLeft();
    glBegin(GL_QUADS);
    for (int i = 0; i < trapezoids.size(); ++i)
        drawTrapezoid(trapezoids[i].translated(delta), offscreen->offscreenSize().height(), ctx);
    glEnd();

    if (needs_scissor)
        glDisable(GL_SCISSOR_TEST);

    glDisable(GL_FRAGMENT_PROGRAM_ARB);

    glMatrixMode(GL_MODELVIEW);
    glPopMatrix();
#endif
}

generateTrapezoids()

virtual QVector<QGLTrapezoid> QGLTrapezoidMaskGenerator::generateTrapezoids ( )

privatepure virtual

Implemented in QGLRectMaskGenerator, QGLLineMaskGenerator, and QGLPathMaskGenerator.

Referenced by drawMask().

screenRect()

QRect QGLTrapezoidMaskGenerator::screenRect ( )

virtual

Implements QGLMaskGenerator.

Definition at line 3175 of file qpaintengine_opengl.cpp.

{
    if (!has_screen_rect) {
        screen_rect = computeScreenRect();
        has_screen_rect = true;
    }

    screen_rect = screen_rect.intersected(QRect(QPoint(), offscreen->drawableSize()));

    return screen_rect;
}

Properties

has_screen_rect

bool QGLTrapezoidMaskGenerator::has_screen_rect

private

Definition at line 3042 of file qpaintengine_opengl.cpp.

Referenced by screenRect().

maskFragmentProgram

GLuint QGLTrapezoidMaskGenerator::maskFragmentProgram

private

Definition at line 3046 of file qpaintengine_opengl.cpp.

Referenced by drawMask().

offscreen

QGLOffscreen* QGLTrapezoidMaskGenerator::offscreen

private

Definition at line 3044 of file qpaintengine_opengl.cpp.

screen_rect

QRect QGLTrapezoidMaskGenerator::screen_rect

private

Definition at line 3041 of file qpaintengine_opengl.cpp.

Referenced by drawMask(), and screenRect().

---

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

• /src/opengl/qpaintengine_opengl.cpp