--- uae/src/include/drawing.h	2018/04/24 16:42:29	1.1
+++ uae/src/include/drawing.h	2018/04/24 16:45:11	1.1.1.3
@@ -12,16 +12,10 @@
 #endif
 
 /*
- * Several people have tried this define, with not much success. Turning on
- * AGA garbles the screen. A place you could start looking is the calcdiw()
- * function - the AGA timing parameters are different, and apparently I
- * haven't figured out the correct formula yet. Pity, the current one looks
- * logical.
- *
- * @@@ Probably won't compile in this version.
+ * This doesn't work very well
  */
 
-/* #define EMULATE_AGA */
+#undef EMULATE_AGA
 
 #ifndef EMULATE_AGA
 #define AGA_CHIPSET 0
@@ -55,7 +49,10 @@ extern int framecnt;
 
 struct color_entry {
 #if AGA_CHIPSET == 0
-    /* X86.S expects this at the start of the structure. */
+    /* Color values in two formats: 12 bit Amiga RGB (color_regs), and
+     * the native color value; both for each Amiga hardware color register. 
+     */
+    /* X86.S expects acolors at the start of the structure. */
     xcolnr acolors[32];
     uae_u16 color_regs[32];
 #else
@@ -132,6 +129,9 @@ struct decision {
 #endif
 };
 
+/* Compute the number of bitplanes from a value written to BPLCON0  */
+#define GET_PLANES(x) ((((x) >> 12) & 7) | (((x) & 0x10) >> 1))
+
 /* Anything related to changes in hw registers during the DDF for one
  * line. */
 struct draw_info {
@@ -143,7 +143,6 @@ struct draw_info {
 
 extern struct decision line_decisions[2 * (maxvpos+1) + 1];
 extern struct draw_info line_drawinfo[2][2 * (maxvpos+1) + 1];
-extern char line_changed[2 * (maxvpos+1)];
 
 extern uae_u8 line_data[(maxvpos+1) * 2][MAX_PLANES * MAX_WORDS_PER_LINE * 2];
 
@@ -163,10 +162,12 @@ enum nln_how {
     /* Interlace, doubled display, upper line.  */
     nln_upper,
     /* Interlace, doubled display, lower line.  */
-    nln_lower
+    nln_lower,
+    /* This line normal, next one black.  */
+    nln_nblack
 };
 
-extern void hsync_record_line_state (int lineno, enum nln_how);
+extern void hsync_record_line_state (int lineno, enum nln_how, int changed);
 extern void vsync_handle_redraw (int long_frame, int lof_changed);
 extern void init_hardware_for_drawing_frame (void);
 extern void finish_drawing_frame (void);
@@ -180,3 +181,23 @@ extern int thisframe_first_drawn_line, t
 extern uae_u16 clxdat, clxcon;
 extern int clx_sprmask;
 extern int diwfirstword,diwlastword;
+
+#define IHF_SCROLLLOCK 0
+#define IHF_QUIT_PROGRAM 1
+#define IHF_PICASSO 2
+#define IHF_SOUNDADJUST 3
+
+extern int inhibit_frame;
+
+static __inline__ void set_inhibit_frame (int bit)
+{
+    inhibit_frame |= 1 << bit;
+}
+static __inline__ void clear_inhibit_frame (int bit)
+{
+    inhibit_frame &= ~(1 << bit);
+}
+static __inline__ void toggle_inhibit_frame (int bit)
+{
+    inhibit_frame ^= ~(1 << bit);
+}