| /* |
| * Copyright 2019 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "modules/skottie/src/text/TextAnimator.h" |
| |
| #include "include/core/SkColor.h" |
| #include "include/core/SkPoint.h" |
| #include "include/private/SkNx.h" |
| #include "modules/skottie/src/SkottieValue.h" |
| #include "modules/skottie/src/animator/Animator.h" |
| #include "modules/skottie/src/text/RangeSelector.h" |
| #include "src/utils/SkJSON.h" |
| |
| namespace skottie { |
| namespace internal { |
| |
| /* |
| * Text layers can have optional text property animators. |
| * |
| * Each animator consists of |
| * |
| * 1) a list of animated properties (e.g. position, fill color, etc) |
| * |
| * 2) a list of range selectors |
| * |
| * Animated properties yield new values to be applied to the text, while range selectors |
| * determine the text subset these new values are applied to. |
| * |
| * The best way to think of range selectors is in terms of coverage: they combine to generate |
| * a coverage value [0..1] for each text fragment/glyph. This coverage is then used to modulate |
| * how the new property value is applied to a given fragment (interpolation weight). |
| * |
| * Note: Bodymovin currently only supports a single selector. |
| * |
| * JSON structure: |
| * |
| * "t": { // text node |
| * "a": [ // animators list |
| * { // animator node |
| * "s": {...}, // selector node |
| * "a": { // animator properties node |
| * "a": {} // optional anchor point value |
| * "p": {}, // optional position value |
| * "s": {}, // optional scale value |
| * "o": {}, // optional opacity |
| * "fc": {}, // optional fill color value |
| * "sc": {}, // optional stroke color value |
| * |
| * // TODO: more props? |
| * } |
| * }, |
| * ... |
| * ], |
| * ... |
| * } |
| */ |
| sk_sp<TextAnimator> TextAnimator::Make(const skjson::ObjectValue* janimator, |
| const AnimationBuilder* abuilder, |
| AnimatablePropertyContainer* acontainer) { |
| if (!janimator) { |
| return nullptr; |
| } |
| |
| const skjson::ObjectValue* jprops = (*janimator)["a"]; |
| if (!jprops) { |
| return nullptr; |
| } |
| |
| std::vector<sk_sp<RangeSelector>> selectors; |
| |
| // Depending on compat mode and whether more than one selector is present, |
| // BM exports either an array or a single object. |
| if (const skjson::ArrayValue* jselectors = (*janimator)["s"]) { |
| selectors.reserve(jselectors->size()); |
| for (const skjson::ObjectValue* jselector : *jselectors) { |
| if (auto sel = RangeSelector::Make(*jselector, abuilder, acontainer)) { |
| selectors.push_back(std::move(sel)); |
| } |
| } |
| } else { |
| if (auto sel = RangeSelector::Make((*janimator)["s"], abuilder, acontainer)) { |
| selectors.reserve(1); |
| selectors.push_back(std::move(sel)); |
| } |
| } |
| |
| return sk_sp<TextAnimator>( |
| new TextAnimator(std::move(selectors), *jprops, abuilder, acontainer)); |
| } |
| |
| void TextAnimator::modulateProps(const DomainMaps& maps, ModulatorBuffer& buf) const { |
| // No selectors -> full coverage. |
| const auto initial_coverage = fSelectors.empty() ? 1.f : 0.f; |
| |
| // Coverage is scoped per animator. |
| for (auto& mod : buf) { |
| mod.coverage = initial_coverage; |
| } |
| |
| // Accumulate selector coverage. |
| for (const auto& selector : fSelectors) { |
| selector->modulateCoverage(maps, buf); |
| } |
| |
| // Modulate animated props. |
| for (auto& mod : buf) { |
| mod.props = this->modulateProps(mod.props, mod.coverage); |
| } |
| } |
| |
| TextAnimator::ResolvedProps TextAnimator::modulateProps(const ResolvedProps& props, |
| float amount) const { |
| auto modulated_props = props; |
| |
| // Transform props compose. |
| modulated_props.position += static_cast<SkV3>(fTextProps.position) * amount; |
| modulated_props.rotation += fTextProps.rotation * amount; |
| modulated_props.tracking += fTextProps.tracking * amount; |
| modulated_props.scale *= SkV3{1,1,1} + |
| (static_cast<SkV3>(fTextProps.scale) * 0.01f - SkV3{1,1,1}) * amount; |
| |
| // ... as does blur |
| modulated_props.blur += fTextProps.blur * amount; |
| |
| const auto lerp_color = [](SkColor c0, SkColor c1, float t) { |
| const auto c0_4f = SkNx_cast<float>(Sk4b::Load(&c0)), |
| c1_4f = SkNx_cast<float>(Sk4b::Load(&c1)), |
| c_4f = c0_4f + (c1_4f - c0_4f) * t; |
| |
| SkColor c; |
| SkNx_cast<uint8_t>(Sk4f_round(c_4f)).store(&c); |
| return c; |
| }; |
| |
| // Colors and opacity are overridden, and use a clamped amount value. |
| const auto clamped_amount = std::max(amount, 0.0f); |
| if (fHasFillColor) { |
| const auto fc = static_cast<SkColor>(fTextProps.fill_color); |
| modulated_props.fill_color = lerp_color(props.fill_color, fc, clamped_amount); |
| } |
| if (fHasStrokeColor) { |
| const auto sc = static_cast<SkColor>(fTextProps.stroke_color); |
| modulated_props.stroke_color = lerp_color(props.stroke_color, sc, clamped_amount); |
| } |
| modulated_props.opacity *= 1 + (fTextProps.opacity * 0.01f - 1) * clamped_amount; // 100-based |
| |
| return modulated_props; |
| } |
| |
| TextAnimator::TextAnimator(std::vector<sk_sp<RangeSelector>>&& selectors, |
| const skjson::ObjectValue& jprops, |
| const AnimationBuilder* abuilder, |
| AnimatablePropertyContainer* acontainer) |
| : fSelectors(std::move(selectors)) |
| , fRequiresAnchorPoint(false) { |
| |
| acontainer->bind(*abuilder, jprops["p"], fTextProps.position); |
| acontainer->bind(*abuilder, jprops["o"], fTextProps.opacity ); |
| acontainer->bind(*abuilder, jprops["t"], fTextProps.tracking); |
| |
| // Scale and rotation are anchor-point-dependent. |
| fRequiresAnchorPoint |= acontainer->bind(*abuilder, jprops["s"], fTextProps.scale); |
| |
| // Depending on whether we're in 2D/3D mode, some of these will stick and some will not. |
| // It's fine either way. |
| fRequiresAnchorPoint |= acontainer->bind(*abuilder, jprops["rx"], fTextProps.rotation.x); |
| fRequiresAnchorPoint |= acontainer->bind(*abuilder, jprops["ry"], fTextProps.rotation.y); |
| fRequiresAnchorPoint |= acontainer->bind(*abuilder, jprops["r" ], fTextProps.rotation.z); |
| |
| fHasFillColor = acontainer->bind(*abuilder, jprops["fc"], fTextProps.fill_color ); |
| fHasStrokeColor = acontainer->bind(*abuilder, jprops["sc"], fTextProps.stroke_color); |
| fHasBlur = acontainer->bind(*abuilder, jprops["bl"], fTextProps.blur ); |
| } |
| |
| } // namespace internal |
| } // namespace skottie |