submodule/src/animation/keyframe_double.cpp

   1 #include "animation/keyframe_double.hpp"
   2 #include "generated/core_registry.hpp"
   3
   4 using namespace rive;
   5
   6 // This whole class is intentionally misnamed to match our editor code. The
   7 // editor uses doubles (float64) for numeric values but at runtime 32 bit
   8 // floating point numbers suffice. So even though this is a "double keyframe" to
   9 // match editor names, the actual values are stored and applied in 32 bits.
  10
  11 static void applyDouble(Core* object, int propertyKey, float mix, float value)
  12 {
  13         if (mix == 1.0f)
  14         {
  15                 CoreRegistry::setDouble(object, propertyKey, value);
  16         }
  17         else
  18         {
  19                 float mixi = 1.0 - mix;
  20                 CoreRegistry::setDouble(
  21                     object,
  22                     propertyKey,
  23                     CoreRegistry::getDouble(object, propertyKey) * mixi + value * mix);
  24         }
  25 }
  26
  27 void KeyFrameDouble::apply(Core* object, int propertyKey, float mix)
  28 {
  29         applyDouble(object, propertyKey, mix, value());
  30 }
  31
  32 void KeyFrameDouble::applyInterpolation(Core* object,
  33                                         int propertyKey,
  34                                         float currentTime,
  35                                         const KeyFrame* nextFrame,
  36                                         float mix)
  37 {
  38         auto kfd = nextFrame->as<KeyFrameDouble>();
  39         const KeyFrameDouble& nextDouble = *kfd;
  40         float f = (currentTime - seconds()) / (nextDouble.seconds() - seconds());
  41
  42         if (CubicInterpolator* cubic = interpolator())
  43         {
  44                 f = cubic->transform(f);
  45         }
  46
  47         applyDouble(
  48             object, propertyKey, mix, value() + (nextDouble.value() - value()) * f);
  49 }