2016-09-13 00:06:47 +00:00
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/*
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* Copyright 2016 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 "SkGradientShader.h"
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#include "SkSVGLinearGradient.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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SkSVGLinearGradient::SkSVGLinearGradient() : INHERITED(SkSVGTag::kLinearGradient) {}
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void SkSVGLinearGradient::setHref(const SkSVGStringType& href) {
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fHref = std::move(href);
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}
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2016-09-13 20:59:05 +00:00
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void SkSVGLinearGradient::setGradientTransform(const SkSVGTransformType& t) {
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fGradientTransform = t;
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}
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2016-09-13 19:56:11 +00:00
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void SkSVGLinearGradient::setSpreadMethod(const SkSVGSpreadMethod& spread) {
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fSpreadMethod = spread;
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}
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2016-09-13 00:06:47 +00:00
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void SkSVGLinearGradient::setX1(const SkSVGLength& x1) {
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fX1 = x1;
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}
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void SkSVGLinearGradient::setY1(const SkSVGLength& y1) {
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fY1 = y1;
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}
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void SkSVGLinearGradient::setX2(const SkSVGLength& x2) {
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fX2 = x2;
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}
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void SkSVGLinearGradient::setY2(const SkSVGLength& y2) {
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fY2 = y2;
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}
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void SkSVGLinearGradient::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
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switch (attr) {
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2016-09-13 20:59:05 +00:00
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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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2016-09-13 00:06:47 +00:00
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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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2016-09-13 19:56:11 +00:00
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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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2016-09-13 00:06:47 +00:00
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case SkSVGAttribute::kX1:
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if (const auto* x1 = v.as<SkSVGLengthValue>()) {
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this->setX1(*x1);
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}
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break;
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case SkSVGAttribute::kY1:
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if (const auto* y1 = v.as<SkSVGLengthValue>()) {
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this->setY1(*y1);
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}
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break;
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case SkSVGAttribute::kX2:
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if (const auto* x2 = v.as<SkSVGLengthValue>()) {
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this->setX2(*x2);
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}
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break;
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case SkSVGAttribute::kY2:
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if (const auto* y2 = v.as<SkSVGLengthValue>()) {
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this->setY2(*y2);
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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 SkSVGLinearGradient::collectColorStops(const SkSVGRenderContext& ctx,
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SkSTArray<2, SkScalar, true>* pos,
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SkSTArray<2, SkColor, true>* 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 SkSVGLinearGradient*>(ref)->collectColorStops(ctx, pos, colors);
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}
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}
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}
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bool SkSVGLinearGradient::onAsPaint(const SkSVGRenderContext& ctx, SkPaint* paint) const {
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const auto& lctx = ctx.lengthContext();
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const auto x1 = lctx.resolve(fX1, SkSVGLengthContext::LengthType::kHorizontal);
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const auto y1 = lctx.resolve(fY1, SkSVGLengthContext::LengthType::kVertical);
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const auto x2 = lctx.resolve(fX2, SkSVGLengthContext::LengthType::kHorizontal);
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const auto y2 = lctx.resolve(fY2, SkSVGLengthContext::LengthType::kVertical);
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const SkPoint pts[2] = { {x1, y1}, {x2, y2}};
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SkSTArray<2, SkColor , true> colors;
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SkSTArray<2, SkScalar, true> 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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2016-09-13 19:56:11 +00:00
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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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2016-09-13 00:06:47 +00:00
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paint->setShader(SkGradientShader::MakeLinear(pts, colors.begin(), pos.begin(), colors.count(),
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2016-09-13 20:59:05 +00:00
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tileMode, 0, &fGradientTransform.value()));
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2016-09-13 00:06:47 +00:00
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return true;
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}
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