QRasterBuffer Class Reference

#include <qpaintengine_raster_p.h>

Public Functions
uchar *	buffer () const
QImage	bufferImage () const
int	bytesPerLine () const
int	bytesPerPixel () const
QImage	colorizeBitmap (const QImage &image, const QColor &color)
void	flushToARGBImage (QImage *image) const
int	height () const
void	init ()
QImage::Format	prepare (QImage *image)
QImage::Format	prepare (QPixmap *pix)
void	prepare (QCustomRasterPaintDevice *device)
void	prepare (int w, int h)
void	prepareBuffer (int w, int h)
	QRasterBuffer ()
void	resetBuffer (int val=0)
uchar *	scanLine (int y)
int	width () const
	~QRasterBuffer ()

Public Variables
QPainter::CompositionMode	compositionMode
QRgb	destColor0
QRgb	destColor1
DrawHelper *	drawHelper
QImage::Format	format
bool	monoDestinationWithClut

Properties
int	bytes_per_line
int	bytes_per_pixel
uchar *	m_buffer
int	m_height
int	m_width

Detailed Description

Definition at line 497 of file qpaintengine_raster_p.h.

Constructors and Destructors

QRasterBuffer()

QRasterBuffer::QRasterBuffer ( )

inline

Definition at line 504 of file qpaintengine_raster_p.h.

: m_width(0), m_height(0), m_buffer(0) { init(); }

~QRasterBuffer()

QRasterBuffer::~QRasterBuffer

(

)

Definition at line 3915 of file qpaintengine_raster.cpp.

{
}

Functions

buffer()

uchar* QRasterBuffer::buffer ( ) const

inline

Definition at line 533 of file qpaintengine_raster_p.h.

Referenced by QRasterPaintEngine::drawImage(), qt_rectfill_nonpremul_quint32(), qt_rectfill_template(), and QCosmeticStroker::setup().

{ return m_buffer; }

bufferImage()

QImage QRasterBuffer::bufferImage

(

)

const

Definition at line 4506 of file qpaintengine_raster.cpp.

{
    QImage image(m_width, m_height, QImage::Format_ARGB32_Premultiplied);

    for (int y = 0; y < m_height; ++y) {
        uint *span = (uint *)const_cast<QRasterBuffer *>(this)->scanLine(y);

        for (int x=0; x<m_width; ++x) {
            uint argb = span[x];
            image.setPixel(x, y, argb);
        }
    }
    return image;
}

bytesPerLine()

int QRasterBuffer::bytesPerLine ( ) const

inline

Definition at line 530 of file qpaintengine_raster_p.h.

Referenced by QRasterPaintEngine::drawImage(), qt_alphamapblit_quint16(), qt_alphamapblit_quint32(), qt_alphargbblit_quint32(), qt_bitmapblit_template(), qt_rectfill_nonpremul_quint32(), qt_rectfill_template(), and QCosmeticStroker::setup().

{ return bytes_per_line; }

bytesPerPixel()

int QRasterBuffer::bytesPerPixel ( ) const

inline

Definition at line 531 of file qpaintengine_raster_p.h.

{ return bytes_per_pixel; }

colorizeBitmap()

QImage QRasterBuffer::colorizeBitmap	(	const QImage &	image,
		const QColor &	color
	)

Definition at line 3892 of file qpaintengine_raster.cpp.

Referenced by QRasterPaintEngine::drawPixmap(), and QRasterPaintEngine::drawTiledPixmap().

{
    Q_ASSERT(image.depth() == 1);

    QImage sourceImage = image.convertToFormat(QImage::Format_MonoLSB);
    QImage dest = QImage(sourceImage.size(), QImage::Format_ARGB32_Premultiplied);

    QRgb fg = PREMUL(color.rgba());
    QRgb bg = 0;

    int height = sourceImage.height();
    int width = sourceImage.width();
    for (int y=0; y<height; ++y) {
        uchar *source = sourceImage.scanLine(y);
        QRgb *target = reinterpret_cast<QRgb *>(dest.scanLine(y));
        if (!source || !target)
            QT_THROW(std::bad_alloc()); // we must have run out of memory
        for (int x=0; x < width; ++x)
            target[x] = (source[x>>3] >> (x&7)) & 1 ? fg : bg;
    }
    return dest;
}

flushToARGBImage()

void QRasterBuffer::flushToARGBImage

(

QImage *

image

)

const

Definition at line 4523 of file qpaintengine_raster.cpp.

{
    int w = qMin(m_width, target->width());
    int h = qMin(m_height, target->height());

    for (int y=0; y<h; ++y) {
        uint *sourceLine = (uint *)const_cast<QRasterBuffer *>(this)->scanLine(y);
        QRgb *dest = (QRgb *) target->scanLine(y);
        for (int x=0; x<w; ++x) {
            QRgb pixel = sourceLine[x];
            int alpha = qAlpha(pixel);
            if (!alpha) {
                dest[x] = 0;
            } else {
                dest[x] = (alpha << 24)
                        | ((255*qRed(pixel)/alpha) << 16)
                        | ((255*qGreen(pixel)/alpha) << 8)
                        | ((255*qBlue(pixel)/alpha) << 0);
            }
        }
    }
}

height()

int QRasterBuffer::height ( ) const

inline

Definition at line 529 of file qpaintengine_raster_p.h.

Referenced by QRasterPaintEngine::alphaPenBlt(), QRasterPaintEngine::clip(), QRasterPaintEngine::drawBitmap(), fillRect_normalized(), qrasterpaintengine_dirty_clip(), qt_alphamapblit_quint32(), qt_alphargbblit_quint32(), and QRasterPaintEngine::setClipRectInDeviceCoords().

{ return m_height; }

init()

void QRasterBuffer::init

(

)

Definition at line 3919 of file qpaintengine_raster.cpp.

{
    compositionMode = QPainter::CompositionMode_SourceOver;
    monoDestinationWithClut = false;
    destColor0 = 0;
    destColor1 = 0;
}

prepare() [1/4]

QImage::Format QRasterBuffer::prepare

(

QImage *

image

)

Definition at line 3927 of file qpaintengine_raster.cpp.

Referenced by blendCursor(), QScreen::compose(), and QScreen::paintBackground().

{
    m_buffer = (uchar *)image->bits();
    m_width = qMin(QT_RASTER_COORD_LIMIT, image->width());
    m_height = qMin(QT_RASTER_COORD_LIMIT, image->height());
    bytes_per_pixel = image->depth()/8;
    bytes_per_line = image->bytesPerLine();

    format = image->format();
    drawHelper = qDrawHelper + format;
    if (image->depth() == 1 && image->colorTable().size() == 2) {
        monoDestinationWithClut = true;
        destColor0 = PREMUL(image->colorTable()[0]);
        destColor1 = PREMUL(image->colorTable()[1]);
    }

    return format;
}

prepare() [2/4]

QImage::Format QRasterBuffer::prepare

(

QPixmap *

pix

)

prepare() [3/4]

void QRasterBuffer::prepare

(

QCustomRasterPaintDevice *

device

)

Definition at line 3953 of file qpaintengine_raster.cpp.

{
    m_buffer = reinterpret_cast<uchar*>(device->memory());
    m_width = qMin(QT_RASTER_COORD_LIMIT, device->width());
    m_height = qMin(QT_RASTER_COORD_LIMIT, device->height());
    bytes_per_pixel = device->depth() / 8;
    bytes_per_line = device->bytesPerLine();
    format = device->format();
#ifndef QT_NO_RASTERCALLBACKS
    if (!m_buffer)
        drawHelper = qDrawHelperCallback + format;
    else
#endif
        drawHelper = qDrawHelper + format;
}

prepare() [4/4]

void QRasterBuffer::prepare	(	int	w,
		int	h
	)

prepareBuffer()

void QRasterBuffer::prepareBuffer	(	int	w,
		int	h
	)

Referenced by QCustomRasterPaintDevice::bytesPerLine().

resetBuffer()

void QRasterBuffer::resetBuffer

(

int

val = 0

)

Definition at line 3946 of file qpaintengine_raster.cpp.

{
    memset(m_buffer, val, m_height*bytes_per_line);
}

scanLine()

uchar* QRasterBuffer::scanLine ( int  y )

inline

Definition at line 520 of file qpaintengine_raster_p.h.

Referenced by blend_color_argb(), blend_color_rgb16(), blend_tiled_argb(), blend_transformed_argb(), blend_transformed_tiled_argb(), blend_untransformed_argb(), blendColor(), blendTiled(), blendTransformed(), blendTransformedBilinear(), blendTransformedTiled(), blendUntransformed(), destFetch(), destFetchARGB32(), destFetchARGB32P(), destFetchMono(), destFetchMonoLsb(), destFetchRGB16(), destStore(), destStoreARGB32(), destStoreMono(), destStoreMonoLsb(), destStoreRGB16(), qt_alphamapblit_quint16(), qt_alphamapblit_quint32(), qt_alphargbblit_quint32(), qt_bitmapblit_template(), qt_blend_color_argb_x86(), and qt_gradient_quint32().

{ Q_ASSERT(y>=0); Q_ASSERT(y<m_height); return m_buffer + y * bytes_per_line; }

width()

int QRasterBuffer::width ( ) const

inline

Definition at line 528 of file qpaintengine_raster_p.h.

Referenced by QRasterPaintEngine::alphaPenBlt(), QRasterPaintEngine::drawBitmap(), fillRect_normalized(), and qrasterpaintengine_dirty_clip().

{ return m_width; }

Properties

bytes_per_line

int QRasterBuffer::bytes_per_line

private

Definition at line 547 of file qpaintengine_raster_p.h.

bytes_per_pixel

int QRasterBuffer::bytes_per_pixel

private

Definition at line 548 of file qpaintengine_raster_p.h.

compositionMode

QPainter::CompositionMode QRasterBuffer::compositionMode

Definition at line 539 of file qpaintengine_raster_p.h.

Referenced by blend_color_rgb16(), blend_transformed_argb(), blend_transformed_tiled_argb(), blendTiled(), blendTransformed(), blendTransformedBilinear(), blendTransformedTiled(), blendUntransformed(), QScreen::compose(), QRasterPaintEngine::drawImage(), fillRect_normalized(), getOperator(), qt_blend_color_argb_x86(), and qt_gradient_quint32().

destColor0

QRgb QRasterBuffer::destColor0

Definition at line 536 of file qpaintengine_raster_p.h.

Referenced by destFetchMono(), destFetchMonoLsb(), destStoreMono(), destStoreMonoLsb(), and findNearestColor().

destColor1

QRgb QRasterBuffer::destColor1

Definition at line 537 of file qpaintengine_raster_p.h.

Referenced by destFetchMono(), destFetchMonoLsb(), destStoreMono(), destStoreMonoLsb(), and findNearestColor().

drawHelper

DrawHelper* QRasterBuffer::drawHelper

Definition at line 541 of file qpaintengine_raster_p.h.

format

QImage::Format QRasterBuffer::format

Definition at line 540 of file qpaintengine_raster_p.h.

Referenced by QRasterPaintEngine::drawImage(), getOperator(), qBlendTexture(), and qBlendTextureCallback().

m_buffer

uchar* QRasterBuffer::m_buffer

private

Definition at line 549 of file qpaintengine_raster_p.h.

m_height

int QRasterBuffer::m_height

private

Definition at line 546 of file qpaintengine_raster_p.h.

m_width

int QRasterBuffer::m_width

private

Definition at line 545 of file qpaintengine_raster_p.h.

monoDestinationWithClut

bool QRasterBuffer::monoDestinationWithClut

Definition at line 535 of file qpaintengine_raster_p.h.

Referenced by destStoreMono(), and destStoreMonoLsb().

---

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

• /src/gui/painting/qpaintengine_raster_p.h
• /src/gui/painting/qpaintengine_raster.cpp