Implement 'cammy slice' to dice images into 160x144 pieces

bin/main.c

@@ -42,7 +42,7 @@ static void usage(int argc, char **argv, const char *message, ...) {
                     "       %1$s import-tile  file.sav 1..30 printer.tile\n"
                     "       %1$s export-tile  file.sav 1..30 output.tile\n"
                     "       %1$s convert-tile printer.tile output.png\n"
-                    "       %1$s stripe       input.png\n",
+                    "       %1$s slice        x-pad y-pad input.png\n",
         argv[0]);
 
     exit(1);
@@ -754,28 +754,38 @@ error_open:
     return errno;
 }
 
-static int stripe(int argc, char **argv) {
+static int slice(int argc, char **argv) {
     uint8_t *buf;
-    size_t width, height;
+
+    size_t width, height,
+           x_pad, y_pad;
+
     int depth;
 
     if (argc < 3) {
+        usage(argc, argv, "No X padding provided");
+    } else if (argc < 4) {
+        usage(argc, argv, "No Y padding provided");
+    } else if (argc < 5) {
         usage(argc, argv, "No input PNG image provided");
     }
 
-    if ((buf = read_png_file(argv[2], &width, &height, &depth)) == NULL) {
+    x_pad = atoi(argv[2]);
+    y_pad = atoi(argv[3]);
+
+    if ((buf = read_png_file(argv[4], &width, &height, &depth)) == NULL) {
         goto error_read_png_file;
     }
 
-    if (cammy_image_stripe(buf, width, height, depth) < 0) {
-        goto error_image_stripe;
+    if (cammy_image_slice(buf, width, height, x_pad, y_pad, depth) < 0) {
+        goto error_image_slice;
     }
 
     free(buf);
 
     return 0;
 
-error_image_stripe:
+error_image_slice:
     free(buf);
 
 error_read_png_file:
@@ -794,7 +804,7 @@ static struct {
     { "import-tile",  import_tile  },
     { "export-tile",  export_tile  },
     { "convert-tile", convert_tile },
-    { "stripe",       stripe       },
+    { "slice",        slice        },
     { NULL,           NULL         }
 };
 

include/cammy/image.h

@@ -100,6 +100,11 @@ void cammy_image_copy(cammy_image *dest,
                       size_t width,
                       size_t height);
 
-int cammy_image_stripe(uint8_t *buf, size_t width, size_t height, int depth);
+int cammy_image_slice(uint8_t *buf,
+                      size_t width,
+                      size_t height,
+                      size_t x_pad,
+                      size_t y_pad,
+                      int depth);
 
 #endif /* _CAMMY_IMAGE_H */

src/image.c

@@ -528,3 +528,49 @@ error_save_tile_to_file:
 error_malloc_tiles:
     return 1;
 }
+
+int cammy_image_slice(uint8_t *buf,
+                      size_t width,
+                      size_t height,
+                      size_t x_pad,
+                      size_t y_pad,
+                      int depth) {
+    cammy_tile *tiles;
+    int file = 0;
+
+    size_t x, y;
+
+    if ((tiles = malloc(CAMMY_SCREEN_SIZE)) == NULL) {
+        goto error_malloc_tiles;
+    }
+
+    for (x=0; x<width; x+=CAMMY_SCREEN_WIDTH + (2 * x_pad)) {
+        for (y=0; y<height; y+=CAMMY_SCREEN_HEIGHT + y_pad) {
+            cammy_image_dither_to_tile(tiles, buf,
+                0, 0,
+                x + x_pad, y,
+                CAMMY_SCREEN_WIDTH,
+                CAMMY_SCREEN_HEIGHT,
+                CAMMY_SCREEN_WIDTH,
+                CAMMY_SCREEN_HEIGHT,
+                width,
+                height,
+                depth);
+
+            if (save_tile_to_file(tiles, CAMMY_SCREEN_WIDTH,
+                                         CAMMY_SCREEN_HEIGHT, file++) < 0) {
+                goto error_save_tile_to_file;
+            }
+        }
+    }
+
+    free(tiles);
+
+    return 0;
+
+error_save_tile_to_file:
+    free(tiles);
+
+error_malloc_tiles:
+    return 1;
+}