From 2f74af6a1069b9d662676e3d2cbbc671a67574b5 Mon Sep 17 00:00:00 2001
From: pacien
Date: Tue, 26 Dec 2017 18:16:55 +0100
Subject: Implement morphing functions and adapt blender

Signed-off-by: pacien <pacien.trangirard@pacien.net>
---
 src/blender/blender.c  |  5 ++---
 src/morpher/morphing.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 3 deletions(-)
 create mode 100644 src/morpher/morphing.c

(limited to 'src')

diff --git a/src/blender/blender.c b/src/blender/blender.c
index 99abedd..08cafa4 100644
--- a/src/blender/blender.c
+++ b/src/blender/blender.c
@@ -1,7 +1,6 @@
 #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
@@ -21,7 +20,7 @@ void blender_blend_canvas(Canvas *canvas, Canvas *source, Canvas *target, Morphi
   CartesianMapping mapping;
   Color pixel;
 
-  dim = morpher_get_dim(morphing);
+  dim = morphing->dim;
 
   assert(dim.x > 0 && dim.y > 0);
   assert(vector_equals(dim, canvas_get_dim(canvas)));
@@ -33,7 +32,7 @@ void blender_blend_canvas(Canvas *canvas, Canvas *source, Canvas *target, Morphi
     point.x = flat_dim % dim.y;
     point.y = flat_dim / dim.y;
 
-    mapping = morpher_get_point_mapping(morphing, point, frame);
+    mapping = (CartesianMapping) {point, point};
     pixel = blend_colors(canvas_get_pixel(source, mapping.origin), canvas_get_pixel(target, mapping.target), frame);
     canvas_set_pixel(canvas, point, pixel);
   }
diff --git a/src/morpher/morphing.c b/src/morpher/morphing.c
new file mode 100644
index 0000000..2ab22d0
--- /dev/null
+++ b/src/morpher/morphing.c
@@ -0,0 +1,44 @@
+#include "morpher/morphing.h"
+#include "common/mem.h"
+
+static inline TriangleMap *init_trianglemap(IntVector width, IntVector height) {
+  TriangleMap *bottom_left = trianglemap_create(m(0, 0), m(0, height), m(width, height));
+  TriangleMap *top_right = trianglemap_create(m(0, 0), m(width, height), m(width, 0));
+  trianglemap_set_neighbors(bottom_left, NULL, NULL, top_right, top_right);
+  trianglemap_set_neighbors(top_right, bottom_left, NULL, NULL, NULL);
+  return bottom_left;
+}
+
+static inline TriangleMap *find_triangle(TriangleMap *start, CartesianVector target) {
+  TriangleMap *t = trianglemap_to(start, target);
+  return t == start ? t : find_triangle(t, target);
+}
+
+static inline void update_center(Morphing *m) {
+  m->center = find_triangle(m->center, v(m->dim.x / 2, m->dim.y / 2));
+}
+
+static inline void ensure_delaunay_neighborhood(TriangleMap *t) {
+  trianglemap_propagate_delaunay(t);
+  trianglemap_propagate_delaunay(t->next);
+  trianglemap_propagate_delaunay(t->next->next);
+}
+
+Morphing *morphing_create(IntVector width, IntVector height) {
+  Morphing *m = malloc_or_die(sizeof(Morphing));
+  m->dim = (CartesianVector) {width, height};
+  m->first = init_trianglemap(width, height);
+  m->center = m->first;
+  return m;
+}
+
+void morphing_destroy(Morphing *m) {
+  while (m->first != NULL) m->first = trianglemap_destroy(m->first);
+}
+
+void morphing_add_constraint(Morphing *m, CartesianVector origin, CartesianVector destination) {
+  TriangleMap *target = find_triangle(m->center, origin);
+  TriangleMap *split = trianglemap_split(target, (CartesianMapping) {origin, destination});
+  ensure_delaunay_neighborhood(split);
+  update_center(m);
+}
-- 
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