5 files changed, 11 insertions, 8 deletions
diff --git a/wr/write-jpeg.c b/wr/write-jpeg.c
index 2e39c68..08dade5 100644
--- a/wr/write-jpeg.c
+++ b/wr/write-jpeg.c
@@ -81,9 +81,11 @@ jpeg_write(FILE *fp, struct ida_image *img)
     jpeg_set_quality(&cinfo, jpeg_quality, TRUE);
     jpeg_start_compress(&cinfo, TRUE);
 
-    for (i = 0, line = img->data; i < img->i.height; i++, line += img->i.width*3)
+    for (i = 0; i < img->i.height; i++) {
+        line = ida_image_scanline(img, i);
         jpeg_write_scanlines(&cinfo, &line, 1);
-    
+    }
+
     jpeg_finish_compress(&(cinfo));
     jpeg_destroy_compress(&(cinfo));
     return 0;
diff --git a/wr/write-png.c b/wr/write-png.c
index c8643a5..34f7bed 100644
--- a/wr/write-png.c
+++ b/wr/write-png.c
@@ -52,7 +52,7 @@ png_write(FILE *fp, struct ida_image *img)
    png_set_packing(png_ptr);
 
    for (y = 0; y < img->i.height; y++) {
-       row = img->data + y * 3 * img->i.width;
+       row = ida_image_scanline(img, y);
        png_write_rows(png_ptr, &row, 1);
    }
    png_write_end(png_ptr, info_ptr);
diff --git a/wr/write-ppm.c b/wr/write-ppm.c
index 016f0ba..1bb1f53 100644
--- a/wr/write-ppm.c
+++ b/wr/write-ppm.c
@@ -19,13 +19,14 @@ ppm_write(FILE *fp, struct ida_image *img)
 	    "# https://www.kraxel.org/blog/linux/fbida/\n"
 	    "%d %d\n255\n",
             img->i.width,img->i.height);
-    fwrite(img->data, img->i.height, 3*img->i.width, fp);
+    fwrite(ida_image_scanline(img, 0),
+           img->i.height, 3*img->i.width, fp);
     return 0;
 }
 
 static struct ida_writer ppm_writer = {
     label:  "PPM",
-    ext:    { "ppm", NULL},
+    ext:    { "ppm", NULL },
     write:  ppm_write,
 };
 
diff --git a/wr/write-ps.c b/wr/write-ps.c
index 261a092..b1a2877 100644
--- a/wr/write-ps.c
+++ b/wr/write-ps.c
@@ -436,7 +436,7 @@ ps_write(FILE *fp, struct ida_image *img)
 
     /* image data + ps footer */
     if (ps.ori == PORTRAIT) {
-	p = img->data;
+	p = ida_image_scanline(img, 0);
 	for (y = 0; y < img->i.height; y++) {
 	    for (x = 0; x < img->i.width; x++) {
 		if (0 == (x % 10))
@@ -448,7 +448,7 @@ ps_write(FILE *fp, struct ida_image *img)
 	}
     } else {
 	for (x = img->i.width-1; x != -1; x--) {
-	    p = img->data + 3*x;
+            p = ida_image_scanline(img, 0) + 3*x;
 	    for (y = 0; y < img->i.height; y++) {
 		if (0 == (y % 10))
 		    fprintf(fp,"\n");
diff --git a/wr/write-tiff.c b/wr/write-tiff.c
index 29d0788..a52c5a1 100644
--- a/wr/write-tiff.c
+++ b/wr/write-tiff.c
@@ -42,7 +42,7 @@ tiff_write(FILE *fp, struct ida_image *img)
     }
 
     for (y = 0; y < img->i.height; y++) {
-	buf = img->data + 3*img->i.width*y;
+	buf = ida_image_scanline(img, y);
 	TIFFWriteScanline(TiffHndl, buf, y, 0);
     }
     TIFFClose(TiffHndl);