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