blob: c3a5bd0dd6e542a693cf80d063334193365d2c2c [file] [log] [blame]
/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkCanvas.h"
#include "include/core/SkMatrix.h"
#include "include/pathops/SkPathOps.h"
#include "include/private/SkTPin.h"
#include "modules/svg/include/SkSVGNode.h"
#include "modules/svg/include/SkSVGRenderContext.h"
#include "modules/svg/include/SkSVGValue.h"
#include "src/core/SkTLazy.h"
SkSVGNode::SkSVGNode(SkSVGTag t) : fTag(t) {
// Uninherited presentation attributes need a non-null default value.
fPresentationAttributes.fStopColor.set(SkSVGColor(SK_ColorBLACK));
fPresentationAttributes.fStopOpacity.set(SkSVGNumberType(1.0f));
fPresentationAttributes.fFloodColor.set(SkSVGColor(SK_ColorBLACK));
fPresentationAttributes.fFloodOpacity.set(SkSVGNumberType(1.0f));
fPresentationAttributes.fLightingColor.set(SkSVGColor(SK_ColorWHITE));
}
SkSVGNode::~SkSVGNode() { }
void SkSVGNode::render(const SkSVGRenderContext& ctx) const {
SkSVGRenderContext localContext(ctx, this);
if (this->onPrepareToRender(&localContext)) {
this->onRender(localContext);
}
}
bool SkSVGNode::asPaint(const SkSVGRenderContext& ctx, SkPaint* paint) const {
SkSVGRenderContext localContext(ctx);
return this->onPrepareToRender(&localContext) && this->onAsPaint(localContext, paint);
}
SkPath SkSVGNode::asPath(const SkSVGRenderContext& ctx) const {
SkSVGRenderContext localContext(ctx);
if (!this->onPrepareToRender(&localContext)) {
return SkPath();
}
SkPath path = this->onAsPath(localContext);
if (const auto* clipPath = localContext.clipPath()) {
// There is a clip-path present on the current node.
Op(path, *clipPath, kIntersect_SkPathOp, &path);
}
return path;
}
SkRect SkSVGNode::objectBoundingBox(const SkSVGRenderContext& ctx) const {
return this->onObjectBoundingBox(ctx);
}
bool SkSVGNode::onPrepareToRender(SkSVGRenderContext* ctx) const {
ctx->applyPresentationAttributes(fPresentationAttributes,
this->hasChildren() ? 0 : SkSVGRenderContext::kLeaf);
// visibility:hidden and display:none disable rendering.
// TODO: if display is not a value (true when display="inherit"), we currently
// ignore it. Eventually we should be able to add SkASSERT(display.isValue()).
const auto visibility = ctx->presentationContext().fInherited.fVisibility->type();
const auto display = fPresentationAttributes.fDisplay; // display is uninherited
return visibility != SkSVGVisibility::Type::kHidden &&
(!display.isValue() || *display != SkSVGDisplay::kNone);
}
void SkSVGNode::setAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
this->onSetAttribute(attr, v);
}
template <typename T>
void SetInheritedByDefault(SkTLazy<T>& presentation_attribute, const T& value) {
if (value.type() != T::Type::kInherit) {
presentation_attribute.set(value);
} else {
// kInherited values are semantically equivalent to
// the absence of a local presentation attribute.
presentation_attribute.reset();
}
}
bool SkSVGNode::parseAndSetAttribute(const char* n, const char* v) {
#define PARSE_AND_SET(svgName, attrName) \
this->set##attrName( \
SkSVGAttributeParser::parseProperty<decltype(fPresentationAttributes.f##attrName)>( \
svgName, n, v))
return PARSE_AND_SET( "clip-path" , ClipPath)
|| PARSE_AND_SET("clip-rule" , ClipRule)
|| PARSE_AND_SET("color" , Color)
|| PARSE_AND_SET("color-interpolation" , ColorInterpolation)
|| PARSE_AND_SET("color-interpolation-filters", ColorInterpolationFilters)
|| PARSE_AND_SET("display" , Display)
|| PARSE_AND_SET("fill" , Fill)
|| PARSE_AND_SET("fill-opacity" , FillOpacity)
|| PARSE_AND_SET("fill-rule" , FillRule)
|| PARSE_AND_SET("filter" , Filter)
|| PARSE_AND_SET("flood-color" , FloodColor)
|| PARSE_AND_SET("flood-opacity" , FloodOpacity)
|| PARSE_AND_SET("font-family" , FontFamily)
|| PARSE_AND_SET("font-size" , FontSize)
|| PARSE_AND_SET("font-style" , FontStyle)
|| PARSE_AND_SET("font-weight" , FontWeight)
|| PARSE_AND_SET("lighting-color" , LightingColor)
|| PARSE_AND_SET("mask" , Mask)
|| PARSE_AND_SET("opacity" , Opacity)
|| PARSE_AND_SET("stop-color" , StopColor)
|| PARSE_AND_SET("stop-opacity" , StopOpacity)
|| PARSE_AND_SET("stroke" , Stroke)
|| PARSE_AND_SET("stroke-dasharray" , StrokeDashArray)
|| PARSE_AND_SET("stroke-dashoffset" , StrokeDashOffset)
|| PARSE_AND_SET("stroke-linecap" , StrokeLineCap)
|| PARSE_AND_SET("stroke-linejoin" , StrokeLineJoin)
|| PARSE_AND_SET("stroke-miterlimit" , StrokeMiterLimit)
|| PARSE_AND_SET("stroke-opacity" , StrokeOpacity)
|| PARSE_AND_SET("stroke-width" , StrokeWidth)
|| PARSE_AND_SET("text-anchor" , TextAnchor)
|| PARSE_AND_SET("visibility" , Visibility);
#undef PARSE_AND_SET
}
// https://www.w3.org/TR/SVG11/coords.html#PreserveAspectRatioAttribute
SkMatrix SkSVGNode::ComputeViewboxMatrix(const SkRect& viewBox,
const SkRect& viewPort,
SkSVGPreserveAspectRatio par) {
if (viewBox.isEmpty() || viewPort.isEmpty()) {
return SkMatrix::Scale(0, 0);
}
auto compute_scale = [&]() -> SkV2 {
const auto sx = viewPort.width() / viewBox.width(),
sy = viewPort.height() / viewBox.height();
if (par.fAlign == SkSVGPreserveAspectRatio::kNone) {
// none -> anisotropic scaling, regardless of fScale
return {sx, sy};
}
// isotropic scaling
const auto s = par.fScale == SkSVGPreserveAspectRatio::kMeet
? std::min(sx, sy)
: std::max(sx, sy);
return {s, s};
};
auto compute_trans = [&](const SkV2& scale) -> SkV2 {
static constexpr float gAlignCoeffs[] = {
0.0f, // Min
0.5f, // Mid
1.0f // Max
};
const size_t x_coeff = par.fAlign >> 0 & 0x03,
y_coeff = par.fAlign >> 2 & 0x03;
SkASSERT(x_coeff < SK_ARRAY_COUNT(gAlignCoeffs) &&
y_coeff < SK_ARRAY_COUNT(gAlignCoeffs));
const auto tx = -viewBox.x() * scale.x,
ty = -viewBox.y() * scale.y,
dx = viewPort.width() - viewBox.width() * scale.x,
dy = viewPort.height() - viewBox.height() * scale.y;
return {
tx + dx * gAlignCoeffs[x_coeff],
ty + dy * gAlignCoeffs[y_coeff]
};
};
const auto s = compute_scale(),
t = compute_trans(s);
return SkMatrix::Translate(t.x, t.y) *
SkMatrix::Scale(s.x, s.y);
}