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#include "blender/blender.h"
#include <assert.h>
#include <math.h>
#include "morpher/morpher.h"
static inline ColorComponent blend_components(ColorComponent origin, ColorComponent target, TimeVector frame) {
// https://www.youtube.com/watch?v=LKnqECcg6Gw
return (ColorComponent) sqrt((TIME_UNIT - frame) * pow(origin, 2) + frame * pow(target, 2));
}
static inline Color blend_colors(Color origin, Color target, TimeVector frame) {
return (Color) {{blend_components(origin.rgba.r, target.rgba.r, frame),
blend_components(origin.rgba.g, target.rgba.g, frame),
blend_components(origin.rgba.b, target.rgba.b, frame),
blend_components(origin.rgba.a, target.rgba.a, frame)}};
}
void blender_blend_canvas(Canvas *canvas, Canvas *source, Canvas *target, Morphing *morphing, TimeVector frame) {
IntVector flat_dim;
CartesianVector dim, point;
CartesianMapping mapping;
Color pixel;
dim = morpher_get_dim(morphing);
assert(dim.x > 0 && dim.y > 0);
assert(vector_equals(dim, canvas_get_dim(canvas)));
assert(vector_equals(dim, canvas_get_dim(source)));
assert(vector_equals(dim, canvas_get_dim(target)));
assert(frame >= TIME_ORIGIN && frame <= TIME_UNIT);
for (flat_dim = (dim.x - 1) * (dim.y - 1); flat_dim >= 0; --flat_dim) {
point.x = flat_dim % dim.y;
point.y = flat_dim / dim.y;
mapping = morpher_get_point_mapping(morphing, point, frame);
pixel = blend_colors(canvas_get_pixel(source, mapping.origin), canvas_get_pixel(target, mapping.target), frame);
canvas_set_pixel(canvas, point, pixel);
}
}
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