122 lines
4.9 KiB
C++
122 lines
4.9 KiB
C++
/*
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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 "include/private/SkTPin.h"
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#include "modules/svg/include/SkSVGGradient.h"
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#include "modules/svg/include/SkSVGRenderContext.h"
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#include "modules/svg/include/SkSVGStop.h"
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#include "modules/svg/include/SkSVGValue.h"
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bool SkSVGGradient::parseAndSetAttribute(const char* name, const char* value) {
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return INHERITED::parseAndSetAttribute(name, value) ||
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this->setGradientTransform(SkSVGAttributeParser::parse<SkSVGTransformType>(
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"gradientTransform", name, value)) ||
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this->setHref(SkSVGAttributeParser::parse<SkSVGIRI>("xlink:href", name, value)) ||
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this->setSpreadMethod(
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SkSVGAttributeParser::parse<SkSVGSpreadMethod>("spreadMethod", name, value)) ||
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this->setGradientUnits(SkSVGAttributeParser::parse<SkSVGObjectBoundingBoxUnits>(
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"gradientUnits", name, value));
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}
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// https://www.w3.org/TR/SVG11/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(this->resolveStopColor(ctx, stop));
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pos->push_back(SkTPin(ltx.resolve(stop.getOffset(), 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.iri().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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ref->tag() == SkSVGTag::kRadialGradient)) {
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static_cast<const SkSVGGradient*>(ref.get())->collectColorStops(ctx, pos, colors);
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}
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}
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}
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SkColor4f SkSVGGradient::resolveStopColor(const SkSVGRenderContext& ctx,
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const SkSVGStop& stop) const {
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const auto& stopColor = stop.getStopColor();
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const auto& stopOpacity = stop.getStopOpacity();
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// Uninherited presentation attrs should have a concrete value at this point.
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if (!stopColor.isValue() || !stopOpacity.isValue()) {
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SkDebugf("unhandled: stop-color or stop-opacity has no value\n");
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return SkColors::kBlack;
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}
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const auto color = SkColor4f::FromColor(ctx.resolveSvgColor(*stopColor));
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return { color.fR, color.fG, color.fB, *stopOpacity };
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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<SkTileMode>(SkSVGSpreadMethod::Type::kPad) ==
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SkTileMode::kClamp, "SkSVGSpreadMethod::Type is out of sync");
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static_assert(static_cast<SkTileMode>(SkSVGSpreadMethod::Type::kRepeat) ==
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SkTileMode::kRepeat, "SkSVGSpreadMethod::Type is out of sync");
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static_assert(static_cast<SkTileMode>(SkSVGSpreadMethod::Type::kReflect) ==
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SkTileMode::kMirror, "SkSVGSpreadMethod::Type is out of sync");
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const auto tileMode = static_cast<SkTileMode>(fSpreadMethod.type());
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const auto obbt = ctx.transformForCurrentOBB(fGradientUnits);
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const auto localMatrix = SkMatrix::Translate(obbt.offset.x, obbt.offset.y)
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* SkMatrix::Scale(obbt.scale.x, obbt.scale.y)
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* fGradientTransform;
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paint->setShader(this->onMakeShader(ctx, colors.begin(), pos.begin(), colors.count(), tileMode,
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localMatrix));
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return true;
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}
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// https://www.w3.org/TR/SVG11/pservers.html#LinearGradientElementSpreadMethodAttribute
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template <>
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bool SkSVGAttributeParser::parse(SkSVGSpreadMethod* spread) {
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static const struct {
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SkSVGSpreadMethod::Type fType;
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const char* fName;
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} gSpreadInfo[] = {
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{ SkSVGSpreadMethod::Type::kPad , "pad" },
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{ SkSVGSpreadMethod::Type::kReflect, "reflect" },
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{ SkSVGSpreadMethod::Type::kRepeat , "repeat" },
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};
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bool parsedValue = false;
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for (size_t i = 0; i < SK_ARRAY_COUNT(gSpreadInfo); ++i) {
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if (this->parseExpectedStringToken(gSpreadInfo[i].fName)) {
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*spread = SkSVGSpreadMethod(gSpreadInfo[i].fType);
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parsedValue = true;
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break;
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}
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}
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return parsedValue && this->parseEOSToken();
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}
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