[PATCH v3 06/11] ati-vga: Create dst and sc rectangle helpers

[Chad Jablonski <chad@jablonski.xyz>]

This creates helper functions for building QemuRects using the dst and
sc registers. These are useful during blit setup and the next patch in
this series will make use of them.

Signed-off-by: Chad Jablonski <chad@jablonski.xyz>
---
 hw/display/ati_2d.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/hw/display/ati_2d.c b/hw/display/ati_2d.c
index a8c4c534b9..0695c26b3b 100644
--- a/hw/display/ati_2d.c
+++ b/hw/display/ati_2d.c
@@ -13,6 +13,7 @@
 #include "qemu/log.h"
 #include "ui/pixel_ops.h"
 #include "ui/console.h"
+#include "ui/rect.h"
 
 /*
  * NOTE:
@@ -43,6 +44,29 @@ static int ati_bpp_from_datatype(ATIVGAState *s)
     }
 }
 
+static QemuRect dst_rect(ATIVGAState *s)
+{
+    QemuRect dst;
+    unsigned dst_x = (s->regs.dp_cntl & DST_X_LEFT_TO_RIGHT ?
+                     s->regs.dst_x :
+                     s->regs.dst_x + 1 - s->regs.dst_width);
+    unsigned dst_y = (s->regs.dp_cntl & DST_Y_TOP_TO_BOTTOM ?
+                     s->regs.dst_y :
+                     s->regs.dst_y + 1 - s->regs.dst_height);
+    qemu_rect_init(&dst, dst_x, dst_y, s->regs.dst_width, s->regs.dst_height);
+    return dst;
+}
+
+static QemuRect sc_rect(ATIVGAState *s)
+{
+    QemuRect sc;
+    qemu_rect_init(&sc,
+                   s->regs.sc_left, s->regs.sc_top,
+                   s->regs.sc_right - s->regs.sc_left + 1,
+                   s->regs.sc_bottom - s->regs.sc_top + 1);
+    return sc;
+}
+
 void ati_2d_blt(ATIVGAState *s)
 {
     /* FIXME it is probably more complex than this and may need to be */
-- 
2.51.0