QGradient SVGPaintServerLinearGradient::setupGradient(QPainter* painter, QPainterPath* painterPath, const RenderObject* object) const
{
Q_UNUSED(painter);
Q_UNUSED(object);
//QPainterPath* path(context ? context->currentPath() : 0);
//Q_ASSERT(path);
double x1, x2, y1, y2;
if (boundingBoxMode()) {
QRectF bbox = painterPath->boundingRect();
x1 = bbox.x();
y1 = bbox.y();
x2 = bbox.x() + bbox.width();
y2 = bbox.y() + bbox.height();
} else {
x1 = gradientStart().x();
y1 = gradientStart().y();
x2 = gradientEnd().x();
y2 = gradientEnd().y();
}
QLinearGradient gradient(QPointF(x1, y1), QPointF(x2, y2));
return gradient;
}
TextStream& SVGPaintServerGradient::externalRepresentation(TextStream& ts) const
{
// Gradients/patterns aren't setup, until they are used for painting. Work around that fact.
m_ownerElement->buildGradient();
// abstract, don't stream type
ts << "[stops=" << gradientStops() << "]";
if (spreadMethod() != SpreadMethodPad)
ts << "[method=" << spreadMethod() << "]";
if (!boundingBoxMode())
ts << " [bounding box mode=" << boundingBoxMode() << "]";
if (!gradientTransform().isIdentity())
ts << " [transform=" << gradientTransform() << "]";
return ts;
}
bool SVGPaintServerGradient::setup(GraphicsContext*& context, const RenderObject* object, SVGPaintTargetType type, bool isPaintingText) const
{
m_ownerElement->buildGradient();
const SVGRenderStyle* style = object->style()->svgStyle();
bool isFilled = (type & ApplyToFillTargetType) && style->hasFill();
bool isStroked = (type & ApplyToStrokeTargetType) && style->hasStroke();
ASSERT(isFilled && !isStroked || !isFilled && isStroked);
context->save();
if (isPaintingText) {
#if PLATFORM(CG)
if (!createMaskAndSwapContextForTextGradient(context, m_savedContext, m_imageBuffer, object)) {
context->restore();
return false;
}
#endif
context->setTextDrawingMode(isFilled ? cTextFill : cTextStroke);
}
if (isFilled) {
context->setAlpha(style->fillOpacity());
context->setFillGradient(m_gradient);
context->setFillRule(style->fillRule());
}
if (isStroked) {
context->setAlpha(style->strokeOpacity());
context->setStrokeGradient(m_gradient);
applyStrokeStyleToContext(context, object->style(), object);
}
if (boundingBoxMode() && !isPaintingText) {
FloatRect bbox = object->relativeBBox(false);
// Don't use gradientes for 1d objects like horizontal/vertical
// lines or rectangles without width or height.
if (bbox.width() == 0 || bbox.height() == 0) {
Color color(0, 0, 0);
context->setStrokeColor(color);
return true;
}
context->translate(bbox.x(), bbox.y());
context->scale(FloatSize(bbox.width(), bbox.height()));
// With scaling the context, the strokeThickness is scaled too. We have to
// undo this.
float strokeThickness = std::max((context->strokeThickness() / ((bbox.width() + bbox.height()) / 2) - 0.001f), 0.f);
context->setStrokeThickness(strokeThickness);
}
context->concatCTM(gradientTransform());
context->setSpreadMethod(spreadMethod());
return true;
}
void SVGPaintServerGradient::handleBoundingBoxModeAndGradientTransformation(GraphicsContext* context, const FloatRect& targetRect) const
{
CGContextRef contextRef = context->platformContext();
if (boundingBoxMode()) {
// Choose default gradient bounding box
CGRect gradientBBox = CGRectMake(0.0, 0.0, 1.0, 1.0);
// Generate a transform to map between both bounding boxes
CGAffineTransform gradientIntoObjectBBox = CGAffineTransformMakeMapBetweenRects(gradientBBox, CGRect(targetRect));
CGContextConcatCTM(contextRef, gradientIntoObjectBBox);
}
// Apply the gradient's own transform
CGAffineTransform transform = gradientTransform();
CGContextConcatCTM(contextRef, transform);
}
void SVGPaintServerGradient::renderPath(GraphicsContext*& context, const RenderPath* path, SVGPaintTargetType type) const
{
RenderStyle* style = path->style();
CGContextRef contextRef = context->platformContext();
ASSERT(contextRef);
// Compute destination object bounding box
FloatRect objectBBox;
if (boundingBoxMode())
objectBBox = CGContextGetPathBoundingBox(contextRef);
if ((type & ApplyToFillTargetType) && style->svgStyle()->hasFill())
clipToFillPath(contextRef, path);
if ((type & ApplyToStrokeTargetType) && style->svgStyle()->hasStroke())
clipToStrokePath(contextRef, path);
handleBoundingBoxModeAndGradientTransformation(context, objectBBox);
}
bool SVGPaintServerGradient::setup(GraphicsContext*& context, const RenderObject* object, SVGPaintTargetType type, bool isPaintingText) const
{
m_ownerElement->buildGradient();
cairo_t* cr = context->platformContext();
cairo_pattern_t* pattern;
cairo_matrix_t matrix;
cairo_matrix_init_identity (&matrix);
const cairo_matrix_t gradient_matrix = gradientTransform();
if (this->type() == LinearGradientPaintServer) {
const SVGPaintServerLinearGradient* linear = static_cast<const SVGPaintServerLinearGradient*>(this);
if (boundingBoxMode()) {
FloatRect bbox = object->relativeBBox(false);
cairo_matrix_translate(&matrix, bbox.x(), bbox.y());
cairo_matrix_scale(&matrix, bbox.width(), bbox.height());
}
double x0 = linear->gradientStart().x();
double y0 = linear->gradientStart().y();
double x1 = linear->gradientEnd().x();
double y1 = linear->gradientEnd().y();
pattern = cairo_pattern_create_linear(x0, y0, x1, y1);
} else if (this->type() == RadialGradientPaintServer) {
const SVGPaintServerRadialGradient* radial = static_cast<const SVGPaintServerRadialGradient*>(this);
if (boundingBoxMode()) {
FloatRect bbox = object->relativeBBox(false);
cairo_matrix_translate(&matrix, bbox.x(), bbox.y());
cairo_matrix_scale(&matrix, bbox.width(), bbox.height());
}
double cx = radial->gradientCenter().x();
double cy = radial->gradientCenter().y();
double radius = radial->gradientRadius();
double fx = radial->gradientFocal().x();
double fy = radial->gradientFocal().y();
fx -= cx;
fy -= cy;
double fradius = 0.0;
if (sqrt(fx * fx + fy * fy) > radius) {
double angle = atan2(fy, fx);
if ((fx + cx) < cx)
fx = int(cos(angle) * radius) + 1;
else
fx = int(cos(angle) * radius) - 1;
if ((fy + cy) < cy)
fy = int(sin(angle) * radius) + 1;
else
fy = int(sin(angle) * radius) - 1;
}
pattern = cairo_pattern_create_radial(fx + cx, fy + cy, fradius, cx, cy, radius);
} else {
return false;
}
cairo_pattern_set_filter(pattern, CAIRO_FILTER_BILINEAR);
switch (spreadMethod()) {
case SPREADMETHOD_PAD:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
break;
case SPREADMETHOD_REFLECT:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REFLECT);
break;
case SPREADMETHOD_REPEAT:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
break;
default:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_NONE);
break;
}
cairo_matrix_multiply(&matrix, &matrix, &gradient_matrix);
cairo_matrix_invert(&matrix);
cairo_pattern_set_matrix(pattern, &matrix);
const Vector<SVGGradientStop>& stops = gradientStops();
for (unsigned i = 0; i < stops.size(); ++i) {
float offset = stops[i].first;
Color color = stops[i].second;
cairo_pattern_add_color_stop_rgba(pattern, offset, color.red() / 255.0, color.green() / 255.0, color.blue() / 255.0, color.alpha() / 255.0);
}
cairo_set_source(cr, pattern);
cairo_pattern_destroy(pattern);
return true;
}
bool SVGPaintServerGradient::setup(GraphicsContext*& context,
const RenderObject* object,
SVGPaintTargetType type,
bool isPaintingText) const
{
m_ownerElement->buildGradient();
RenderStyle* style = object->style();
bool isFilled =
(type & ApplyToFillTargetType) &&
style->svgStyle()->hasFill();
bool isStroked =
(type & ApplyToStrokeTargetType) &&
style->svgStyle()->hasStroke();
if(!gradientStops().size())
return false;
if(gradientStops().size()==1) {
context->setFillColor(gradientStops()[0].second);
return true;
}
// Create a gradient builder helper to generate the data
// we'll need to provide Skia
SkiaGradientBuilder builder(gradientStops(),
isFilled ? style->svgStyle()->fillOpacity() :
style->svgStyle()->strokeOpacity());
SkShader::TileMode tile_mode;
// Convert SVG spread modes to Skia tile modes
switch(spreadMethod())
{
default:
case SPREADMETHOD_PAD:
tile_mode = SkShader::kClamp_TileMode; break;
case SPREADMETHOD_REFLECT:
tile_mode = SkShader::kMirror_TileMode; break;
case SPREADMETHOD_REPEAT:
tile_mode = SkShader::kRepeat_TileMode; break;
}
SkShader* shader = NULL;
SkMatrix matrix;
// Calculate a matrix to transform a gradient to fit the bounding box
if (boundingBoxMode()) {
matrix.reset();
SkRect rc = context->getBoundingBoxForCurrentPath(true);
matrix.preTranslate(rc.fLeft, rc.fTop);
matrix.preScale(rc.width(), rc.height());
matrix.preConcat(gradientTransform());
} else
matrix = gradientTransform();
if (this->type() == LinearGradientPaintServer) {
const SVGPaintServerLinearGradient* linear =
static_cast<const SVGPaintServerLinearGradient*>(this);
SkPoint pts[2];
pts[0].fX = linear->gradientStart().x();
pts[0].fY = linear->gradientStart().y();
pts[1].fX = linear->gradientEnd().x();
pts[1].fY = linear->gradientEnd().y();
shader = SkGradientShader::CreateLinear(pts,
builder.colors(), builder.pos(), builder.count(), tile_mode);
} else if (this->type() == RadialGradientPaintServer) {
const SVGPaintServerRadialGradient* radial =
static_cast<const SVGPaintServerRadialGradient*>(this);
SkPoint center;
SkScalar radius;
center.fX = radial->gradientCenter().x();
center.fY = radial->gradientCenter().y();
radius = radial->gradientRadius();
shader = SkGradientShader::CreateRadial(
center, radius, builder.colors(), builder.pos(),
builder.count(), tile_mode);
} else {
return false;
}
if (isPaintingText) {
if (isFilled) {
context->setTextDrawingMode(cTextFill);
}
if (isStroked) {
context->setTextDrawingMode(cTextStroke);
}
}
if (isStroked) {
applyStrokeStyleToContext(context, style, object);
}
if (shader) {
shader->setLocalMatrix(matrix);
context->platformContext()->setGradient(shader);
return true;
}
return false;
}
bool RenderSVGResourceGradient::applyResource(RenderObject* object, RenderStyle* style, GraphicsContext*& context, unsigned short resourceMode)
{
ASSERT(object);
ASSERT(style);
ASSERT(context);
ASSERT(resourceMode != ApplyToDefaultMode);
// Be sure to synchronize all SVG properties on the gradientElement _before_ processing any further.
// Otherwhise the call to collectGradientAttributes() in createTileImage(), may cause the SVG DOM property
// synchronization to kick in, which causes removeAllClientsFromCache() to be called, which in turn deletes our
// GradientData object! Leaving out the line below will cause svg/dynamic-updates/SVG*GradientElement-svgdom* to crash.
SVGGradientElement* gradientElement = static_cast<SVGGradientElement*>(node());
if (!gradientElement)
return false;
if (m_shouldCollectGradientAttributes) {
gradientElement->updateAnimatedSVGAttribute(anyQName());
collectGradientAttributes(gradientElement);
m_shouldCollectGradientAttributes = false;
}
// Spec: When the geometry of the applicable element has no width or height and objectBoundingBox is specified,
// then the given effect (e.g. a gradient or a filter) will be ignored.
FloatRect objectBoundingBox = object->objectBoundingBox();
if (boundingBoxMode() && objectBoundingBox.isEmpty())
return false;
if (!m_gradient.contains(object))
m_gradient.set(object, new GradientData);
GradientData* gradientData = m_gradient.get(object);
bool isPaintingText = resourceMode & ApplyToTextMode;
// Create gradient object
if (!gradientData->gradient) {
buildGradient(gradientData, gradientElement);
// CG platforms will handle the gradient space transform for text after applying the
// resource, so don't apply it here. For non-CG platforms, we want the text bounding
// box applied to the gradient space transform now, so the gradient shader can use it.
#if PLATFORM(CG)
if (boundingBoxMode() && !objectBoundingBox.isEmpty() && !isPaintingText) {
#else
if (boundingBoxMode() && !objectBoundingBox.isEmpty()) {
#endif
gradientData->userspaceTransform.translate(objectBoundingBox.x(), objectBoundingBox.y());
gradientData->userspaceTransform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
}
AffineTransform gradientTransform;
calculateGradientTransform(gradientTransform);
gradientData->userspaceTransform *= gradientTransform;
gradientData->gradient->setGradientSpaceTransform(gradientData->userspaceTransform);
}
if (!gradientData->gradient)
return false;
// Draw gradient
context->save();
if (isPaintingText) {
#if PLATFORM(CG)
if (!createMaskAndSwapContextForTextGradient(context, m_savedContext, m_imageBuffer, object)) {
context->restore();
return false;
}
#endif
context->setTextDrawingMode(resourceMode & ApplyToFillMode ? TextModeFill : TextModeStroke);
}
const SVGRenderStyle* svgStyle = style->svgStyle();
ASSERT(svgStyle);
if (resourceMode & ApplyToFillMode) {
context->setAlpha(svgStyle->fillOpacity());
context->setFillGradient(gradientData->gradient);
context->setFillRule(svgStyle->fillRule());
} else if (resourceMode & ApplyToStrokeMode) {
if (svgStyle->vectorEffect() == VE_NON_SCALING_STROKE)
gradientData->gradient->setGradientSpaceTransform(transformOnNonScalingStroke(object, gradientData->userspaceTransform));
context->setAlpha(svgStyle->strokeOpacity());
context->setStrokeGradient(gradientData->gradient);
SVGRenderSupport::applyStrokeStyleToContext(context, style, object);
}
return true;
}
void RenderSVGResourceGradient::postApplyResource(RenderObject* object, GraphicsContext*& context, unsigned short resourceMode, const Path* path)
{
ASSERT(context);
ASSERT(resourceMode != ApplyToDefaultMode);
if (resourceMode & ApplyToTextMode) {
#if PLATFORM(CG)
// CG requires special handling for gradient on text
if (m_savedContext && m_gradient.contains(object)) {
GradientData* gradientData = m_gradient.get(object);
// Restore on-screen drawing context
context = m_savedContext;
m_savedContext = 0;
AffineTransform gradientTransform;
calculateGradientTransform(gradientTransform);
FloatRect targetRect;
gradientData->gradient->setGradientSpaceTransform(clipToTextMask(context, m_imageBuffer, targetRect, object, boundingBoxMode(), gradientTransform));
context->setFillGradient(gradientData->gradient);
context->fillRect(targetRect);
m_imageBuffer.clear();
}
#else
UNUSED_PARAM(object);
#endif
} else if (path) {
if (resourceMode & ApplyToFillMode)
context->fillPath(*path);
else if (resourceMode & ApplyToStrokeMode)
context->strokePath(*path);
}
context->restore();
}