altlines and altcolumns

4 files changed, 34 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index 7176eb4..884de84 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /a.out
 /tests
+/*.png
diff --git a/main.c b/main.c
index c1b0dd0..27c8918 100644
--- a/main.c
+++ b/main.c
@@ -10,9 +10,10 @@ main(int argc, char **argv)
 	}
 
 	KldImage *img = kld_load(argv[1]);
+	kld_altcolumns(img);
 	kld_sand(img);
-	kld_grayscale(img);
-	kld_chaos3(img);
+	kld_altlines(img);
+	kld_bit3(img);
 	kld_writePAM(img, stdout);
 
 	kld_free(img);
diff --git a/src/image.c b/src/image.c
index 4103250..2909218 100644
--- a/src/image.c
+++ b/src/image.c
@@ -453,6 +453,32 @@ kld_sand(KldImage *img)
 }
 
 void
+kld_altcolumns(KldImage *img)
+{
+	NULL_SAFETY();
+
+	for (size_t y = 0; y < img->height; y++) {
+		for (size_t x = 1; x < img->width; x += 2) {
+			const KldColor tmp = kld_get(img, x, y);
+			kld_set(img, x, y, kld_get(img, x - 1, y));
+			kld_set(img, x - 1, y, tmp);
+		}
+	}
+}
+
+void
+kld_altlines(KldImage *img)
+{
+	for (size_t y = 1; y < img->height; y += 2) {
+		for (size_t x = 0; x < img->width; x++) {
+			const KldColor tmp = kld_get(img, x, y);
+			kld_set(img, x, y, kld_get(img, x, y - 1));
+			kld_set(img, x, y - 1, tmp);
+		}
+	}
+}
+
+void
 kld_mod(KldImage *img, KldColor mask)
 {
 	NULL_SAFETY();
diff --git a/src/image.h b/src/image.h
index 67a4bb1..59758a6 100644
--- a/src/image.h
+++ b/src/image.h
@@ -56,6 +56,10 @@ void kld_bit3(KldImage *img);
 
 void kld_sand(KldImage *img);
 
+void kld_altcolumns(KldImage *img);
+
+void kld_altlines(KldImage *img);
+
 void kld_mod(KldImage *img, KldColor mask);
 
 /* cmd examples: