qquickcontext2d.cpp File Reference

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#include "qquickcontext2d_p.h"
#include "qquickcontext2dcommandbuffer_p.h"
#include "qquickcanvasitem_p.h"
#include <private/qtquickglobal_p.h>
#include <private/qquickcontext2dtexture_p.h>
#include <private/qquickitem_p.h>
#include <qsgrendererinterface.h>
#include <QtQuick/private/qsgcontext_p.h>
#include <private/qquicksvgparser_p.h>
#include <private/qquickimage_p_p.h>
#include <qqmlinfo.h>
#include <qqmlengine.h>
#include <private/qv4domerrors_p.h>
#include <private/qv4engine_p.h>
#include <private/qv4object_p.h>
#include <private/qv4qobjectwrapper_p.h>
#include <private/qquickwindow_p.h>
#include <private/qv4value_p.h>
#include <private/qv4functionobject_p.h>
#include <private/qv4objectproto_p.h>
#include <private/qv4scopedvalue_p.h>
#include <private/qlocale_tools_p.h>
#include <QtCore/qmath.h>
#include <QtCore/qvector.h>
#include <QtCore/private/qnumeric_p.h>
#include <QtCore/QRunnable>
#include <QtGui/qguiapplication.h>
#include <private/qguiapplication_p.h>
#include <qpa/qplatformintegration.h>
#include <private/qsgdefaultrendercontext_p.h>
#include <QtCore/qpointer.h>
#include <cmath>
#include "moc_qquickcontext2d_p.cpp"

Include dependency graph for qquickcontext2d.cpp:

Go to the source code of this file.

Classes
class	QQuickContext2DEngineData
struct	QV4::Heap::QQuickJSContext2D
struct	QV4::Heap::QQuickJSContext2DPrototype
struct	QV4::Heap::QQuickContext2DStyle
struct	QV4::Heap::QQuickJSContext2DPixelData
struct	QV4::Heap::QQuickJSContext2DImageData
struct	QQuickJSContext2D
struct	QQuickJSContext2DPrototype
struct	QQuickContext2DStyle
struct	QQuickJSContext2DPixelData
struct	QQuickJSContext2DImageData

Namespaces
namespace	QV4
namespace	QV4::Heap

Macros
#define	CHECK_CONTEXT(r)
	\qmltype Context2D \nativetype QQuickContext2D \inqmlmodule QtQuick
#define	CHECK_CONTEXT_SETTER(r)
#define	qClamp(val, min, max)
#define	CHECK_RGBA(c)
#define	Q_TRY_SET_TOKEN(token, value, setStatement)

Enumerations
enum	FontToken {   NoTokens = 0x00 , FontStyle = 0x01 , FontVariant = 0x02 , FontWeight = 0x04 ,   NoTokens = 0x00 , FontStyle = 0x01 , FontVariant = 0x02 , FontWeight = 0x04 }
enum	FontToken {   NoTokens = 0x00 , FontStyle = 0x01 , FontVariant = 0x02 , FontWeight = 0x04 ,   NoTokens = 0x00 , FontStyle = 0x01 , FontVariant = 0x02 , FontWeight = 0x04 }

Functions
Q_QUICK_EXPORT QColor	qt_color_from_string (const QV4::Value &name)
static int	qParseFontSizeFromToken (QStringView fontSizeToken, bool &ok)
static bool	qSetFontSizeFromToken (QFont &font, QStringView fontSizeToken)
static QStringList	qExtractFontFamiliesFromString (QStringView fontFamiliesString)
static bool	qSetFontFamilyFromTokens (QFont &font, const QStringList &fontFamilyTokens)
static QFont	qt_font_from_string (const QString &fontString, const QFont &currentFont)
	DEFINE_OBJECT_VTABLE (QQuickJSContext2D)
	DEFINE_OBJECT_VTABLE (QQuickJSContext2DPrototype)
	DEFINE_OBJECT_VTABLE (QQuickContext2DStyle)
QImage	qt_image_convolute_filter (const QImage &src, const QVector< qreal > &weights, int radius=0)
void	qt_image_boxblur (QImage &image, int radius, bool quality)
static QPainter::CompositionMode	qt_composite_mode_from_string (const QString &compositeOperator)
static QString	qt_composite_mode_to_string (QPainter::CompositionMode op)
	DEFINE_OBJECT_VTABLE (QQuickJSContext2DPixelData)
	DEFINE_OBJECT_VTABLE (QQuickJSContext2DImageData)
static QV4::ReturnedValue	qt_create_image_data (qreal w, qreal h, QV4::ExecutionEngine *v4, QImage &&image)
int	baseLineOffset (QQuickContext2D::TextBaseLineType value, const QFontMetrics &metrics)
static int	textAlignOffset (QQuickContext2D::TextAlignType value, const QFontMetrics &metrics, const QString &text)
static bool	areCollinear (const QPointF &a, const QPointF &b, const QPointF &c)
static bool	withinRange (qreal p, qreal a, qreal b)

Macro Definition Documentation

CHECK_CONTEXT

#define CHECK_CONTEXT

(

r

)

Value:

                                if (!r || !r->d()->context() || !r->d()->context()->bufferValid()) \
                                THROW_GENERIC_ERROR("Not a Context2D object");

\qmltype Context2D \nativetype QQuickContext2D \inqmlmodule QtQuick

Since

5.0

Provides 2D context for shapes on a Canvas item.

The Context2D object can be created by Canvas item's getContext() method:

Canvas {
  id:canvas
  onPaint:{
     var ctx = canvas.getContext('2d');
     //...
  }
}

The Context2D API implements the same \l {http://www.w3.org/TR/2dcontext}{W3C Canvas 2D Context API standard} with some enhanced features.

The Context2D API provides the rendering {context} which defines the methods and attributes needed to draw on the Canvas item. The following assigns the canvas rendering context to a {context} variable:

var context = mycanvas.getContext("2d")

The Context2D API renders the canvas as a coordinate system whose origin (0,0) is at the top left corner, as shown in the figure below. Coordinates increase along the {x} axis from left to right and along the {y} axis from top to bottom of the canvas.

Definition at line 95 of file qquickcontext2d.cpp.

CHECK_CONTEXT_SETTER

#define CHECK_CONTEXT_SETTER

(

r

)

Value:

                                       if (!r || !r->d()->context() || !r->d()->context()->bufferValid()) \
                                       THROW_GENERIC_ERROR("Not a Context2D object");

Definition at line 98 of file qquickcontext2d.cpp.

CHECK_RGBA

#define CHECK_RGBA

(

c

)

Value:

(c == '-' || c == '.' || (c >=0 && c <= 9))

Definition at line 101 of file qquickcontext2d.cpp.

Q_TRY_SET_TOKEN

#define Q_TRY_SET_TOKEN	(		token,
			value,
			setStatement )

Value:

if (!(usedTokens & token)) { \
    usedTokens |= token; \
    setStatement; \
} else { \
    qWarning().nospace() << "Context2D: Duplicate token " << QLatin1String(value) << " found in font string."; \
    return currentFont; \
}

Definition at line 319 of file qquickcontext2d.cpp.

qClamp

#define qClamp	(		val,
			min,
			max )

Value:

qMin(qMax(val, min), max)

Definition at line 100 of file qquickcontext2d.cpp.

Enumeration Type Documentation

FontToken [1/2]

enum FontToken

Enumerator
NoTokens
FontStyle
FontVariant
FontWeight
NoTokens
FontStyle
FontVariant
FontWeight

Definition at line 311 of file qquickcontext2d.cpp.

FontToken [2/2]

enum FontToken

Enumerator
NoTokens
FontStyle
FontVariant
FontWeight
NoTokens
FontStyle
FontVariant
FontWeight

Definition at line 311 of file qquickcontext2d.cpp.

Function Documentation

areCollinear()

bool areCollinear ( const QPointF & a, const QPointF & b, const QPointF & c )

inlinestatic

Definition at line 4182 of file qquickcontext2d.cpp.

baseLineOffset()

int baseLineOffset	(	QQuickContext2D::TextBaseLineType	value,
		const QFontMetrics &	metrics )

Definition at line 4117 of file qquickcontext2d.cpp.

DEFINE_OBJECT_VTABLE() [1/5]

DEFINE_OBJECT_VTABLE

(

QQuickContext2DStyle

)

DEFINE_OBJECT_VTABLE() [2/5]

DEFINE_OBJECT_VTABLE

(

QQuickJSContext2D

)

DEFINE_OBJECT_VTABLE() [3/5]

DEFINE_OBJECT_VTABLE

(

QQuickJSContext2DImageData

)

DEFINE_OBJECT_VTABLE() [4/5]

DEFINE_OBJECT_VTABLE

(

QQuickJSContext2DPixelData

)

DEFINE_OBJECT_VTABLE() [5/5]

DEFINE_OBJECT_VTABLE

(

QQuickJSContext2DPrototype

)

qExtractFontFamiliesFromString()

QStringList qExtractFontFamiliesFromString ( QStringView fontFamiliesString )

static

Definition at line 220 of file qquickcontext2d.cpp.

qParseFontSizeFromToken()

int qParseFontSizeFromToken ( QStringView fontSizeToken, bool & ok )

static

Definition at line 174 of file qquickcontext2d.cpp.

qSetFontFamilyFromTokens()

bool qSetFontFamilyFromTokens ( QFont & font, const QStringList & fontFamilyTokens )

static

Definition at line 278 of file qquickcontext2d.cpp.

qSetFontSizeFromToken()

bool qSetFontSizeFromToken ( QFont & font, QStringView fontSizeToken )

static

Definition at line 190 of file qquickcontext2d.cpp.

qt_color_from_string()

Q_QUICK_EXPORT QColor qt_color_from_string

(

const QV4::Value &

name

)

Definition at line 102 of file qquickcontext2d.cpp.

qt_composite_mode_from_string()

QPainter::CompositionMode qt_composite_mode_from_string ( const QString & compositeOperator )

static

Definition at line 784 of file qquickcontext2d.cpp.

qt_composite_mode_to_string()

QString qt_composite_mode_to_string ( QPainter::CompositionMode op )

static

Definition at line 838 of file qquickcontext2d.cpp.

qt_create_image_data()

QV4::ReturnedValue qt_create_image_data ( qreal w, qreal h, QV4::ExecutionEngine * v4, QImage && image )

static

Definition at line 942 of file qquickcontext2d.cpp.

qt_font_from_string()

QFont qt_font_from_string ( const QString & fontString, const QFont & currentFont )

static

Definition at line 333 of file qquickcontext2d.cpp.

References NoTokens.

qt_image_boxblur()

QT_BEGIN_NAMESPACE void qt_image_boxblur	(	QImage &	image,
		int	radius,
		bool	quality )

Definition at line 776 of file qquickcontext2d.cpp.

qt_image_convolute_filter()

QImage qt_image_convolute_filter	(	const QImage &	src,
		const QVector< qreal > &	weights,
		int	radius = 0 )

Definition at line 700 of file qquickcontext2d.cpp.

textAlignOffset()

int textAlignOffset ( QQuickContext2D::TextAlignType value, const QFontMetrics & metrics, const QString & text )

static

Definition at line 4137 of file qquickcontext2d.cpp.

References QQuickContext2D::Center, QQuickContext2D::Left, and QQuickContext2D::Right.

withinRange()

bool withinRange ( qreal p, qreal a, qreal b )

inlinestatic

Definition at line 4188 of file qquickcontext2d.cpp.