Fix the vertical stitching function.

docs/_static/overrides.css

@@ -1 +1,2 @@
 .wy-side-nav-search a { display: none }
+.wy-side-nav-search .version { display: none }

src/ops.c

@@ -1,5 +1,6 @@
 #include "image.h"
 #include <assert.h>
+#include <memory.h>
 
 heman_image* heman_ops_step(heman_image* hmap, HEMAN_FLOAT threshold)
 {
@@ -80,20 +81,19 @@ heman_image* heman_ops_stitch_vertical(heman_image** images, int count)
     assert(count > 0);
     int width = images[0]->width;
     int height = images[0]->height;
+    int nbands = images[0]->nbands;
     for (int i = 0; i < count; i++) {
         assert(images[i]->width == width);
         assert(images[i]->height == height);
-        assert(images[i]->nbands == 1 || images[i]->nbands == 3);
+        assert(images[i]->nbands == nbands);
     }
     heman_image* result = heman_image_create(width, height * count, 3);
-
-#pragma omp parallel for
-    for (int y = 0; y < height; y++) {
-        for (int tile = 0; tile < count; tile++) {
-            copy_row(images[tile], result, 0, y + height * tile);
-        }
+    int size = width * height * nbands;
+    HEMAN_FLOAT* dst = result->data;
+    for (int tile = 0; tile < count; tile++) {
+        memcpy(dst, images[tile]->data, size * sizeof(float));
+        dst += size;
     }
-
     return result;
 }
 

test/test_planet.c

@@ -3,8 +3,7 @@
 
 #define COUNT(a) (sizeof(a) / sizeof(a[0]))
 #define OUTFOLDER "build/"
-#define SEED 7000
-#define HEIGHT 512
+#define HEIGHT 256
 
 static int CP_LOCATIONS[] = {
     000,  // Dark Blue
@@ -30,17 +29,28 @@ static heman_color CP_COLORS[] = {
 
 static float LIGHTPOS[] = {-0.5f, 0.5f, 1.0f};
 
-int main(int argc, char** argv)
+heman_image* make_planet(int seed, heman_image* grad)
 {
-    heman_image* grad = heman_color_create_gradient(
-        256, COUNT(CP_COLORS), CP_LOCATIONS, CP_COLORS);
-    heman_image* hmap = heman_generate_planet_heightmap(HEIGHT * 2, HEIGHT, SEED);
+    heman_image* hmap = heman_generate_planet_heightmap(HEIGHT * 2, HEIGHT, seed);
     heman_image* albedo = heman_color_apply_gradient(hmap, -0.5, 0.5, grad);
-    heman_image_destroy(grad);
     heman_image* planet =
         heman_lighting_apply(hmap, albedo, 1, 1, 0.75, LIGHTPOS);
     heman_image_destroy(hmap);
     heman_image_destroy(albedo);
-    hut_write_image(OUTFOLDER "planet.png", planet, 0, 1);
-    heman_image_destroy(planet);
+    return planet;
+}
+
+int main(int argc, char** argv)
+{
+    heman_image* grad = heman_color_create_gradient(
+        256, COUNT(CP_COLORS), CP_LOCATIONS, CP_COLORS);
+    heman_image* tiles[2];
+    tiles[0] = make_planet(1000, grad);
+    tiles[1] = make_planet(1001, grad);
+    heman_image* planets = heman_ops_stitch_vertical(tiles, 2);
+    heman_image_destroy(tiles[0]);
+    heman_image_destroy(tiles[1]);
+    hut_write_image(OUTFOLDER "planets.png", planets, 0, 1);
+    heman_image_destroy(planets);
+    heman_image_destroy(grad);
 }