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dotted/dashed borders rendering with Qpainter surface very slow - bug 432453. r=vladimir

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This commit is contained in:
Oleg Romashin 2008-08-19 04:29:25 +03:00
parent c571db3f50
commit 3b63e6ae70
1 changed files with 26 additions and 0 deletions
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26
gfx/cairo/cairo/src/cairo-qpainter-surface.cpp
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@ -79,6 +79,10 @@
#define CAIRO_INT_STATUS_SUCCESS ((cairo_int_status_t) CAIRO_STATUS_SUCCESS)
#endif
/* Qt::PenStyle optimization based on the assumption that dots are 1*w and dashes are 3*w. */
#define DOT_LENGTH 1.0
#define DASH_LENGTH 3.0
typedef struct {
cairo_surface_t base;
@ -1062,6 +1066,28 @@ struct PatternToPenConverter {
mPen->setMiterLimit (style->miter_limit);
if (style->dash && style->num_dashes) {
Qt::PenStyle pstyle = Qt::NoPen;
if (style->num_dashes == 2) {
if ((style->dash[0] == style->line_width &&
style->dash[1] == style->line_width && style->line_width <= 2.0) ||
(style->dash[0] == 0.0 &&
style->dash[1] == style->line_width * 2 && cap == Qt::RoundCap))
{
pstyle = Qt::DotLine;
} else if (style->dash[0] == style->line_width * DASH_LENGTH &&
style->dash[1] == style->line_width * DASH_LENGTH &&
cap == Qt::FlatCap)
{
pstyle = Qt::DashLine;
}
}
if (pstyle != Qt::NoPen) {
mPen->setStyle(pstyle);
return;
}
unsigned int odd_dash = style->num_dashes % 2;
QVector<qreal> dashes (odd_dash ? style->num_dashes * 2 : style->num_dashes);