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<title>Qt 4.2: svgalibpaintengine.cpp Example File (qtopiacore/svgalib/svgalibpaintengine.cpp)</title>
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<pre> /****************************************************************************
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#include "svgalibpaintengine.h"
#include <QColor>
#include <vga.h>
#include <vgagl.h>
SvgalibPaintEngine::SvgalibPaintEngine()
{
}
SvgalibPaintEngine::~SvgalibPaintEngine()
{
}
bool SvgalibPaintEngine::begin(QPaintDevice *dev)
{
device = dev;
pen = Qt::NoPen;
simplePen = true;
brush = Qt::NoBrush;
simpleBrush = true;
matrix = QMatrix();
simpleMatrix = true;
setClip(QRect(0, 0, device->width(), device->height()));
simpleClip = true;
opaque = true;
aliased = true;
sourceOver = true;
return QRasterPaintEngine::begin(dev);
}
bool SvgalibPaintEngine::end()
{
gl_setclippingwindow(0, 0, device->width() - 1, device->height() - 1);
return QRasterPaintEngine::end();
}
void SvgalibPaintEngine::updateState(const QPaintEngineState &state)
{
QPaintEngine::DirtyFlags flags = state.state();
if (flags & DirtyTransform) {
matrix = state.matrix();
simpleMatrix = (matrix.m12() == 0 && matrix.m21() == 0);
}
if (flags & DirtyPen) {
pen = state.pen();
simplePen = (pen.width() == 0 || pen.widthF() <= 1)
&& (pen.style() == Qt::NoPen || pen.style() == Qt::SolidLine)
&& (pen.color().alpha() == 255);
}
if (flags & DirtyBrush) {
brush = state.brush();
simpleBrush = (brush.style() == Qt::SolidPattern
|| brush.style() == Qt::NoBrush)
&& (brush.color().alpha() == 255);
}
if (flags & DirtyClipRegion)
setClip(state.clipRegion());
if (flags & DirtyClipEnabled) {
clipEnabled = state.isClipEnabled();
updateClip();
}
if (flags & DirtyClipPath) {
setClip(QRegion());
simpleClip = false;
}
if (flags & DirtyCompositionMode) {
const QPainter::CompositionMode m = state.compositionMode();
sourceOver = (m == QPainter::CompositionMode_SourceOver);
}
if (flags & DirtyOpacity)
opaque = (state.opacity() == 256);
if (flags & DirtyHints)
aliased = !(state.renderHints() & QPainter::Antialiasing);
QRasterPaintEngine::updateState(state);
}
void SvgalibPaintEngine::setClip(const QRegion &region)
{
if (region.isEmpty())
clip = QRect(0, 0, device->width(), device->height());
else
clip = matrix.map(region) & QRect(0, 0, device->width(), device->height());
clipEnabled = true;
updateClip();
}
void SvgalibPaintEngine::updateClip()
{
QRegion clipRegion = QRect(0, 0, device->width(), device->height());
if (!systemClip().isEmpty())
clipRegion &= systemClip();
if (clipEnabled)
clipRegion &= clip;
simpleClip = (clipRegion.rects().size() <= 1);
const QRect r = clipRegion.boundingRect();
gl_setclippingwindow(r.left(), r.top(),
r.x() + r.width(),
r.y() + r.height());
}
void SvgalibPaintEngine::drawRects(const QRect *rects, int rectCount)
{
const bool canAccelerate = simplePen && simpleBrush && simpleMatrix
&& simpleClip && opaque && aliased
&& sourceOver;
if (!canAccelerate) {
QRasterPaintEngine::drawRects(rects, rectCount);
return;
}
for (int i = 0; i < rectCount; ++i) {
const QRect r = matrix.mapRect(rects[i]);
if (brush != Qt::NoBrush) {
gl_fillbox(r.left(), r.top(), r.width(), r.height(),
brush.color().rgba());
}
if (pen != Qt::NoPen) {
const int c = pen.color().rgba();
gl_hline(r.left(), r.top(), r.right(), c);
gl_hline(r.left(), r.bottom(), r.right(), c);
gl_line(r.left(), r.top(), r.left(), r.bottom(), c);
gl_line(r.right(), r.top(), r.right(), r.bottom(), c);
}
}
}</pre>
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