532a091626
Currently, the href logic only visits linear gradient nodes. Update to also visit radial gradients, per https://www.w3.org/TR/SVG/pservers.html#RadialGradientElementHrefAttribute. Change-Id: I8d33d9faa65dae776c13e134c497acccfb428abb Reviewed-on: https://skia-review.googlesource.com/57480 Commit-Queue: Robert Phillips <robertphillips@google.com> Reviewed-by: Robert Phillips <robertphillips@google.com>
101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
/*
|
|
* Copyright 2017 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#include "SkSVGGradient.h"
|
|
#include "SkSVGRenderContext.h"
|
|
#include "SkSVGStop.h"
|
|
#include "SkSVGValue.h"
|
|
|
|
void SkSVGGradient::setHref(const SkSVGStringType& href) {
|
|
fHref = std::move(href);
|
|
}
|
|
|
|
void SkSVGGradient::setGradientTransform(const SkSVGTransformType& t) {
|
|
fGradientTransform = t;
|
|
}
|
|
|
|
void SkSVGGradient::setSpreadMethod(const SkSVGSpreadMethod& spread) {
|
|
fSpreadMethod = spread;
|
|
}
|
|
|
|
void SkSVGGradient::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
|
|
switch (attr) {
|
|
case SkSVGAttribute::kGradientTransform:
|
|
if (const auto* t = v.as<SkSVGTransformValue>()) {
|
|
this->setGradientTransform(*t);
|
|
}
|
|
break;
|
|
case SkSVGAttribute::kHref:
|
|
if (const auto* href = v.as<SkSVGStringValue>()) {
|
|
this->setHref(*href);
|
|
}
|
|
break;
|
|
case SkSVGAttribute::kSpreadMethod:
|
|
if (const auto* spread = v.as<SkSVGSpreadMethodValue>()) {
|
|
this->setSpreadMethod(*spread);
|
|
}
|
|
break;
|
|
default:
|
|
this->INHERITED::onSetAttribute(attr, v);
|
|
}
|
|
}
|
|
|
|
// https://www.w3.org/TR/SVG/pservers.html#LinearGradientElementHrefAttribute
|
|
void SkSVGGradient::collectColorStops(const SkSVGRenderContext& ctx,
|
|
StopPositionArray* pos,
|
|
StopColorArray* colors) const {
|
|
// Used to resolve percentage offsets.
|
|
const SkSVGLengthContext ltx(SkSize::Make(1, 1));
|
|
|
|
for (const auto& child : fChildren) {
|
|
if (child->tag() != SkSVGTag::kStop) {
|
|
continue;
|
|
}
|
|
|
|
const auto& stop = static_cast<const SkSVGStop&>(*child);
|
|
colors->push_back(SkColorSetA(stop.stopColor(),
|
|
SkScalarRoundToInt(stop.stopOpacity() * 255)));
|
|
pos->push_back(SkTPin(ltx.resolve(stop.offset(), SkSVGLengthContext::LengthType::kOther),
|
|
0.f, 1.f));
|
|
}
|
|
|
|
SkASSERT(colors->count() == pos->count());
|
|
|
|
if (pos->empty() && !fHref.value().isEmpty()) {
|
|
const auto* ref = ctx.findNodeById(fHref);
|
|
if (ref && (ref->tag() == SkSVGTag::kLinearGradient ||
|
|
ref->tag() == SkSVGTag::kRadialGradient)) {
|
|
static_cast<const SkSVGGradient*>(ref)->collectColorStops(ctx, pos, colors);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool SkSVGGradient::onAsPaint(const SkSVGRenderContext& ctx, SkPaint* paint) const {
|
|
StopColorArray colors;
|
|
StopPositionArray pos;
|
|
|
|
this->collectColorStops(ctx, &pos, &colors);
|
|
|
|
// TODO:
|
|
// * stop (lazy?) sorting
|
|
// * href loop detection
|
|
// * href attribute inheritance (not just color stops)
|
|
// * objectBoundingBox units support
|
|
|
|
static_assert(static_cast<SkShader::TileMode>(SkSVGSpreadMethod::Type::kPad) ==
|
|
SkShader::kClamp_TileMode, "SkSVGSpreadMethod::Type is out of sync");
|
|
static_assert(static_cast<SkShader::TileMode>(SkSVGSpreadMethod::Type::kRepeat) ==
|
|
SkShader::kRepeat_TileMode, "SkSVGSpreadMethod::Type is out of sync");
|
|
static_assert(static_cast<SkShader::TileMode>(SkSVGSpreadMethod::Type::kReflect) ==
|
|
SkShader::kMirror_TileMode, "SkSVGSpreadMethod::Type is out of sync");
|
|
const auto tileMode = static_cast<SkShader::TileMode>(fSpreadMethod.type());
|
|
|
|
paint->setShader(this->onMakeShader(ctx, colors.begin(), pos.begin(), colors.count(), tileMode,
|
|
fGradientTransform.value()));
|
|
return true;
|
|
}
|