static void drawLineOnCairoContext(GraphicsContext* graphicsContext, cairo_t* context, const FloatPoint& point1, const FloatPoint& point2)
{
StrokeStyle style = graphicsContext->strokeStyle();
if (style == NoStroke)
return;
const Color& strokeColor = graphicsContext->strokeColor();
int strokeThickness = floorf(graphicsContext->strokeThickness());
if (graphicsContext->strokeThickness() < 1)
strokeThickness = 1;
int patternWidth = 0;
if (style == DottedStroke)
patternWidth = strokeThickness;
else if (style == DashedStroke)
patternWidth = 3 * strokeThickness;
bool isVerticalLine = point1.x() == point2.x();
FloatPoint point1OnPixelBoundaries = point1;
FloatPoint point2OnPixelBoundaries = point2;
GraphicsContext::adjustLineToPixelBoundaries(point1OnPixelBoundaries, point2OnPixelBoundaries, strokeThickness, style);
cairo_set_antialias(context, CAIRO_ANTIALIAS_NONE);
if (patternWidth) {
// Do a rect fill of our endpoints. This ensures we always have the
// appearance of being a border. We then draw the actual dotted/dashed line.
FloatRect firstRect(point1OnPixelBoundaries, FloatSize(strokeThickness, strokeThickness));
FloatRect secondRect(point2OnPixelBoundaries, FloatSize(strokeThickness, strokeThickness));
if (isVerticalLine) {
firstRect.move(-strokeThickness / 2, -strokeThickness);
secondRect.move(-strokeThickness / 2, 0);
} else {
firstRect.move(-strokeThickness, -strokeThickness / 2);
secondRect.move(0, -strokeThickness / 2);
}
fillRectWithColor(context, firstRect, strokeColor);
fillRectWithColor(context, secondRect, strokeColor);
int distance = (isVerticalLine ? (point2.y() - point1.y()) : (point2.x() - point1.x())) - 2 * strokeThickness;
double patternOffset = calculateStrokePatternOffset(distance, patternWidth);
double patternWidthAsDouble = patternWidth;
cairo_set_dash(context, &patternWidthAsDouble, 1, patternOffset);
}
setSourceRGBAFromColor(context, strokeColor);
cairo_set_line_width(context, strokeThickness);
cairo_move_to(context, point1OnPixelBoundaries.x(), point1OnPixelBoundaries.y());
cairo_line_to(context, point2OnPixelBoundaries.x(), point2OnPixelBoundaries.y());
cairo_stroke(context);
}
void GraphicsContext::drawLinesForText(const FloatPoint& point, const DashArray& widths, bool printing, bool doubleUnderlines)
{
if (paintingDisabled())
return;
if (widths.size() <= 0)
return;
Color localStrokeColor(strokeColor());
bool shouldAntialiasLine;
FloatRect bounds = computeLineBoundsAndAntialiasingModeForText(point, widths.last(), printing, shouldAntialiasLine, localStrokeColor);
Vector<FloatRect, 4> dashBounds;
ASSERT(!(widths.size() % 2));
dashBounds.reserveInitialCapacity(dashBounds.size() / 2);
for (size_t i = 0; i < widths.size(); i += 2)
dashBounds.append(FloatRect(FloatPoint(bounds.x() + widths[i], bounds.y()), FloatSize(widths[i+1] - widths[i], bounds.height())));
if (doubleUnderlines) {
// The space between double underlines is equal to the height of the underline
for (size_t i = 0; i < widths.size(); i += 2)
dashBounds.append(FloatRect(FloatPoint(bounds.x() + widths[i], bounds.y() + 2 * bounds.height()), FloatSize(widths[i+1] - widths[i], bounds.height())));
}
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
for (auto& dash : dashBounds)
fillRectWithColor(cr, dash, localStrokeColor);
cairo_restore(cr);
}
void GraphicsContext::fillRect(const FloatRect& rect, const Color& color, ColorSpace)
{
if (paintingDisabled())
return;
if (hasShadow())
platformContext()->shadowBlur().drawRectShadow(this, rect, RoundedRect::Radii());
fillRectWithColor(platformContext()->cr(), rect, color);
}
// Draws a filled rectangle with a stroked border.
void GraphicsContext::drawRect(const IntRect& rect)
{
if (paintingDisabled())
return;
cairo_t* cr = platformContext()->cr();
cairo_save(cr);
fillRectWithColor(cr, rect, fillColor());
if (strokeStyle() != NoStroke) {
setSourceRGBAFromColor(cr, strokeColor());
FloatRect r(rect);
r.inflate(-.5f);
cairo_rectangle(cr, r.x(), r.y(), r.width(), r.height());
cairo_set_line_width(cr, 1.0);
cairo_stroke(cr);
}
cairo_restore(cr);
}