Add support for converting screen tile grabs to PNG

bin/main.c

@@ -2,10 +2,15 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
 #include <errno.h>
 #include "pnglite.h"
 
 #include <cammy/image.h>
+#include <cammy/screen.h>
 #include <cammy/photo.h>
 #include <cammy/sram.h>
 
@@ -28,11 +33,12 @@ static void usage(int argc, char **argv, const char *message, ...) {
          fprintf(stderr, "\n");
     }
 
-    fprintf(stderr, "usage: %1$s import file.sav photo1..30 input.png\n"
-                    "       %1$s export file.sav photo1..30 output.png\n"
-                    "       %1$s dither input.png output.png\n"
-                    "       %1$s split  file.sav rn gn bn input.png\n"
-                    "       %1$s merge  file.sav rn gn bn output.png\n",
+    fprintf(stderr, "usage: %1$s import  file.sav photo1..30 input.png\n"
+                    "       %1$s export  file.sav photo1..30 output.png\n"
+                    "       %1$s dither  input.png output.png\n"
+                    "       %1$s split   file.sav rn gn bn input.png\n"
+                    "       %1$s merge   file.sav rn gn bn output.png\n"
+                    "       %1$s convert printer.tile output.png\n",
         argv[0]);
 
     exit(1);
@@ -521,16 +527,105 @@ error_sram_open:
     return 1;
 }
 
+static int convert(int argc, char **argv) {
+    int fd;
+    void *in, *out;
+    png_t *png;
+    int error;
+
+    if (argc < 3) {
+        usage(argc, argv, "No input Game Boy screen tile data file provided");
+    } else if (argc < 4) {
+        usage(argc, argv, "No output PNG filename provided");
+    }
+
+    if ((fd = open(argv[2], O_RDONLY)) < 0) {
+        fprintf(stderr, "%s: %s: %s: %s\n",
+            argv[0], "open()", argv[2], strerror(errno));
+
+        goto error_open;
+    }
+
+    if ((in = malloc(CAMMY_SCREEN_SIZE)) == NULL) {
+        fprintf(stderr, "%s: %s: %s\n",
+            argv[0], "malloc()",  strerror(errno));
+
+        goto error_malloc_in;
+    }
+
+    if (read(fd, in, CAMMY_SCREEN_SIZE) < 0) {
+        fprintf(stderr, "%s: %s: %s: %s\n",
+            argv[0], "read()", argv[2], strerror(errno));
+
+        goto error_read;
+    }
+
+    if ((out = malloc(CAMMY_SCREEN_WIDTH * CAMMY_SCREEN_HEIGHT * 3)) == NULL) {
+        fprintf(stderr, "%s: %s: %s\n",
+            argv[0], "malloc()", strerror(errno));
+
+        goto error_malloc_out;
+    }
+
+    png_init(malloc, free);
+
+    if ((png = malloc(sizeof(*png))) == NULL) {
+        goto error_malloc_png;
+    }
+
+    if ((error = png_open_file_write(png, argv[3])) < 0) {
+        fprintf(stderr, "%s: %s: %s: %s\n",
+            argv[0], "png_open_file_write()", argv[3], png_error_string(error));
+
+        goto error_png_open_file_write;
+    }
+
+    cammy_image_copy_from_tile(out, in,
+                               CAMMY_SCREEN_WIDTH,
+                               CAMMY_SCREEN_HEIGHT, 3, &palette);
+
+    if ((error = png_set_data(png, CAMMY_SCREEN_WIDTH, CAMMY_SCREEN_HEIGHT, 8, PNG_TRUECOLOR, out)) < 0) {
+        fprintf(stderr, "%s: %s: %s: %s\n",
+            argv[0], "png_set_data()", argv[3], png_error_string(error));
+
+        goto error_png_set_data;
+    }
+
+    png_close_file(png);
+
+    return 0;
+
+error_png_set_data:
+    png_close_file(png);
+
+error_png_open_file_write:
+    free(png);
+
+error_malloc_png:
+    free(out);
+
+error_malloc_out:
+error_read:
+    free(in);
+
+error_malloc_in:
+    close(fd);
+
+error_open:
+    return errno;
+}
+
 static struct {
     char *name;
     int (*fun)(int, char **);
 } commands[] = {
-    { "import", import },
-    { "export", export },
-    { "dither", dither },
-    { "split",  split  },
-    { "merge",  merge  },
-    { NULL,     NULL   }
+    { "import",  import  },
+    { "export",  export  },
+    { "dither",  dither  },
+    { "split",   split   },
+    { "merge",   merge   },
+    { "convert", convert },
+    { NULL,      NULL    }
 };
 
 int main(int argc, char **argv) {

include/cammy/screen.h

@@ -0,0 +1,15 @@
+#ifndef _CAMMY_SCREEN_H
+#define _CAMMY_SCREEN_H
+
+#include <cammy/tile.h>
+
+#define CAMMY_SCREEN_TILE_WIDTH  20
+#define CAMMY_SCREEN_TILE_HEIGHT 18
+
+#define CAMMY_SCREEN_WIDTH  (CAMMY_TILE_WIDTH  * CAMMY_SCREEN_TILE_WIDTH)
+#define CAMMY_SCREEN_HEIGHT (CAMMY_TILE_HEIGHT * CAMMY_SCREEN_TILE_HEIGHT)
+
+#define CAMMY_SCREEN_SIZE \
+    (CAMMY_TILE_SIZE * CAMMY_SCREEN_TILE_WIDTH * CAMMY_SCREEN_TILE_HEIGHT)
+
+#endif /* _CAMMY_SCREEN_H */