1 files changed, 94 insertions, 0 deletions
diff --git a/src/cursor.c b/src/cursor.c
new file mode 100644
index 0000000..faa96b1
--- /dev/null
+++ b/src/cursor.c
@@ -0,0 +1,94 @@
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "libnsfb.h"
+#include "libnsfb_plot.h"
+#include "libnsfb_cursor.h"
+
+#include "nsfb.h"
+#include "cursor.h"
+#include "nsfb_plot.h"
+#include "frontend.h"
+
+
+bool nsfb_cursor_init(nsfb_t *nsfb)
+{
+    if (nsfb->cursor != NULL)
+        return false;
+
+    nsfb->cursor = calloc(1, sizeof(struct nsfb_cursor_s));
+    if (nsfb->cursor == NULL) 
+        return false;
+
+    nsfb->cursor->loc.x0 = nsfb->width / 2;
+    nsfb->cursor->loc.y0 = nsfb->height / 2;
+    return true;
+}
+
+bool nsfb_cursor_set(nsfb_t *nsfb, const nsfb_colour_t *pixel, int bmp_width, int bmp_height, int bmp_stride)
+{
+    if (nsfb->cursor == NULL) 
+        return false;
+
+    nsfb->cursor->pixel = pixel;
+    nsfb->cursor->bmp_width = bmp_width;
+    nsfb->cursor->bmp_height = bmp_height;
+    nsfb->cursor->bmp_stride = bmp_stride;
+    nsfb->cursor->loc.x1 = nsfb->cursor->loc.x0 + nsfb->cursor->bmp_width;
+    nsfb->cursor->loc.y1 = nsfb->cursor->loc.y0 + nsfb->cursor->bmp_height;
+ 
+    return nsfb->frontend_rtns->cursor(nsfb, nsfb->cursor);
+}
+
+bool nsfb_cursor_loc_set(nsfb_t *nsfb, const nsfb_bbox_t *loc)
+{
+    if (nsfb->cursor == NULL) 
+        return false;
+
+    nsfb->cursor->loc = *loc;
+    nsfb->cursor->loc.x1 = nsfb->cursor->loc.x0 + nsfb->cursor->bmp_width;
+    nsfb->cursor->loc.y1 = nsfb->cursor->loc.y0 + nsfb->cursor->bmp_height;
+
+    return nsfb->frontend_rtns->cursor(nsfb, nsfb->cursor);
+}
+
+bool nsfb_cursor_loc_get(nsfb_t *nsfb, nsfb_bbox_t *loc)
+{
+    if (nsfb->cursor == NULL) 
+        return false;
+
+    *loc = nsfb->cursor->loc;
+    return true;
+}
+
+/* documented in cursor.h */
+bool nsfb_cursor_plot(nsfb_t *nsfb, struct nsfb_cursor_s *cursor)
+{
+    int sav_size;
+
+    cursor->savloc = cursor->loc;
+
+    cursor->sav_width = cursor->savloc.x1 - cursor->savloc.x0;
+    cursor->sav_height = cursor->savloc.y1 - cursor->savloc.y0;
+
+    sav_size = cursor->sav_width * cursor->sav_height * sizeof(nsfb_colour_t);
+    if (cursor->sav_size < sav_size) {
+        cursor->sav = realloc(cursor->sav, sav_size);
+        cursor->sav_size = sav_size;
+    }
+ 
+    nsfb->plotter_fns->readrect(nsfb, &cursor->savloc, cursor->sav );
+    cursor->sav_width = cursor->savloc.x1 - cursor->savloc.x0;
+    cursor->sav_height = cursor->savloc.y1 - cursor->savloc.y0;
+        
+    nsfb->plotter_fns->bitmap(nsfb, 
+                              &cursor->loc,  
+                              cursor->pixel, 
+                              cursor->bmp_width, 
+                              cursor->bmp_height, 
+                              cursor->bmp_stride, 
+                              true);
+    cursor->plotted = true;
+
+    return true;
+}