237 lines
7.6 KiB
C++
237 lines
7.6 KiB
C++
/*
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* RenderItemMergeFunction.hpp
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*
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* Created on: Feb 16, 2009
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* Author: struktured
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*/
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#ifndef RenderItemMergeFunction_HPP_
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#define RenderItemMergeFunction_HPP_
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#include "Common.hpp"
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#include "Renderable.hpp"
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#include "Waveform.hpp"
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#include <limits>
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#include <functional>
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#include <map>
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template <class T>
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inline T interpolate(T a, T b, float ratio)
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{
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return (ratio*a + (1-ratio)*b) * 0.5;
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}
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template <>
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inline int interpolate(int a, int b, float ratio)
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{
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return (int)(ratio*(float)a + (1-ratio)*(float)b) * 0.5;
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}
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template <>
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inline bool interpolate(bool a, bool b, float ratio)
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{
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return (ratio >= 0.5) ? a : b;
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}
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/// Merges two render items and returns zero if they are virtually equivalent and large values
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/// when they are dissimilar. If two render items cannot be compared, NOT_COMPARABLE_VALUE is returned.
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class RenderItemMergeFunction {
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public:
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virtual RenderItem * operator()(const RenderItem * r1, const RenderItem * r2, double ratio) const = 0;
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virtual TypeIdPair typeIdPair() const = 0;
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};
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/// A base class to construct render item distance mergeFunctions. Just specify your two concrete
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/// render item types as template parameters and override the computeMerge() function.
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template <class R1, class R2=R1, class R3=R2>
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class RenderItemMerge : public RenderItemMergeFunction {
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protected:
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/// Override to create your own distance mergeFunction for your specified custom types.
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virtual R3 * computeMerge(const R1 * r1, const R2 * r2, double ratio) const = 0;
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public:
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inline virtual R3 * operator()(const RenderItem * r1, const RenderItem * r2, double ratio) const {
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if (supported(r1, r2))
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return computeMerge(dynamic_cast<const R1*>(r1), dynamic_cast<const R2*>(r2), ratio);
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else if (supported(r2,r1))
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return computeMerge(dynamic_cast<const R1*>(r2), dynamic_cast<const R2*>(r1), ratio);
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else
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return 0;
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}
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/// Returns true if and only if r1 and r2 are of type R1 and R2 respectively.
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inline bool supported(const RenderItem * r1, const RenderItem * r2) const {
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return typeid(r1) == typeid(const R1 *) && typeid(r2) == typeid(const R2 *);
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}
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inline TypeIdPair typeIdPair() const {
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return TypeIdPair(typeid(const R1*).name(), typeid(const R2*).name());
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}
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};
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class ShapeMerge : public RenderItemMerge<Shape> {
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public:
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ShapeMerge() {}
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virtual ~ShapeMerge() {}
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protected:
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virtual inline Shape * computeMerge(const Shape * lhs, const Shape * rhs, double ratio) const {
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Shape * ret = new Shape();
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Shape & target = *ret;
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target.x = interpolate(lhs->x, rhs->x, ratio);
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target.y = interpolate(lhs->y, rhs->y, ratio);
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target.a = interpolate(lhs->a, rhs->a, ratio);
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target.a2 = interpolate(lhs->a2, rhs->a2, ratio);
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target.r = interpolate(lhs->r, rhs->r, ratio);
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target.r2 = interpolate(lhs->r2, rhs->r2, ratio);
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target.g = interpolate(lhs->g, rhs->g, ratio);
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target.g2 = interpolate(lhs->g2, rhs->g2, ratio);
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target.b = interpolate(lhs->b, rhs->b, ratio);
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target.b2 = interpolate(lhs->b2, rhs->b2, ratio);
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target.ang = interpolate(lhs->ang, rhs->ang, ratio);
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target.radius = interpolate(lhs->radius, rhs->radius, ratio);
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target.tex_ang = interpolate(lhs->tex_ang, rhs->tex_ang, ratio);
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target.tex_zoom = interpolate(lhs->tex_zoom, rhs->tex_zoom, ratio);
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target.border_a = interpolate(lhs->border_a, rhs->border_a, ratio);
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target.border_r = interpolate(lhs->border_r, rhs->border_r, ratio);
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target.border_g = interpolate(lhs->border_g, rhs->border_g, ratio);
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target.border_b = interpolate(lhs->border_b, rhs->border_b, ratio);
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target.sides = interpolate(lhs->sides, rhs->sides, ratio);
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target.additive = interpolate(lhs->additive, rhs->additive, ratio);
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target.textured = interpolate(lhs->textured, rhs->textured, ratio);
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target.thickOutline = interpolate(lhs->thickOutline, rhs->thickOutline, ratio);
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target.enabled = interpolate(lhs->enabled, rhs->enabled, ratio);
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target.masterAlpha = interpolate(lhs->masterAlpha, rhs->masterAlpha, ratio);
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target.imageUrl = (ratio > 0.5) ? lhs->imageUrl : rhs->imageUrl, ratio;
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return ret;
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}
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};
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class BorderMerge : public RenderItemMerge<Border> {
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public:
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BorderMerge() {}
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virtual ~BorderMerge() {}
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protected:
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virtual inline Border * computeMerge(const Border * lhs, const Border * rhs, double ratio) const
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{
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Border * ret = new Border();
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Border & target = *ret;
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target.inner_a = interpolate(lhs->inner_a, rhs->inner_a, ratio);
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target.inner_r = interpolate(lhs->inner_r, rhs->inner_r, ratio);
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target.inner_g = interpolate(lhs->inner_g, rhs->inner_g, ratio);
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target.inner_b = interpolate(lhs->inner_b, rhs->inner_b, ratio);
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target.inner_size = interpolate(lhs->inner_size, rhs->inner_size, ratio);
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target.outer_a = interpolate(lhs->outer_a, rhs->outer_a, ratio);
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target.outer_r = interpolate(lhs->outer_r, rhs->outer_r, ratio);
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target.outer_g = interpolate(lhs->outer_g, rhs->outer_g, ratio);
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target.outer_b = interpolate(lhs->outer_b, rhs->outer_b, ratio);
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target.outer_size = interpolate(lhs->outer_size, rhs->outer_size, ratio);
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target.masterAlpha = interpolate(lhs->masterAlpha, rhs->masterAlpha, ratio);
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return ret;
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}
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};
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class WaveformMerge : public RenderItemMerge<Waveform> {
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public:
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WaveformMerge() {}
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virtual ~WaveformMerge() {}
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protected:
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/// @BUG unimplemented
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virtual inline Waveform * computeMerge(const Waveform * lhs, const Waveform * rhs, double ratio) const
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{
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return 0;
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/*
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Waveform * ret = new Waveform();
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Waveform & target = *ret;
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target.additive = interpolate(lhs->additive, rhs->additive, ratio);
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target.dots = interpolate(lhs->dots, rhs->dots, ratio);
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target.samples = (rhs->samples > lhs-> samples) ? lhs->samples : rhs->samples;
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target.scaling = interpolate(lhs->scaling, rhs->scaling, ratio);
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target.sep = interpolate(lhs->sep, rhs->sep, ratio);
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target.smoothing = interpolate(lhs->smoothing, rhs->smoothing, ratio);
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target.spectrum = interpolate(lhs->spectrum, rhs->spectrum, ratio);
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target.thick = interpolate(lhs->thick, rhs->thick, ratio);
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target.masterAlpha = interpolate(lhs->masterAlpha, rhs->masterAlpha, ratio);
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return ret;
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*/
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}
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};
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/// Use as the top level merge function. It stores a map of all other
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/// merge functions, using the function that fits best with the
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/// incoming type parameters.
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class MasterRenderItemMerge : public RenderItemMerge<RenderItem> {
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typedef std::map<TypeIdPair, RenderItemMergeFunction*> MergeFunctionMap;
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public:
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MasterRenderItemMerge() {}
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virtual ~MasterRenderItemMerge() {}
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inline void add(RenderItemMergeFunction * fun) {
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_mergeFunctionMap[fun->typeIdPair()] = fun;
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}
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protected:
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virtual inline RenderItem * computeMerge(const RenderItem * lhs, const RenderItem * rhs, double ratio) const {
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RenderItemMergeFunction * mergeFunction;
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TypeIdPair pair(typeid(lhs), typeid(rhs));
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if (_mergeFunctionMap.count(pair)) {
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mergeFunction = _mergeFunctionMap[pair];
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} else if (_mergeFunctionMap.count(pair = TypeIdPair(typeid(rhs), typeid(lhs)))) {
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mergeFunction = _mergeFunctionMap[pair];
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} else {
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mergeFunction = 0;
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}
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// If specialized mergeFunction exists, use it to get higher granularity
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// of correctness
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if (mergeFunction)
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return (*mergeFunction)(lhs, rhs, ratio);
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else
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return 0;
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}
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private:
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mutable MergeFunctionMap _mergeFunctionMap;
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};
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#endif /* RenderItemMergeFunction_HPP_ */
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