sm501: Fix hardware cursor

Rework HWC handling to simplify it and fix cursor not updating on
screen as needed. Previously cursor was not updated because checking
for changes in a line overrode the update flag set for the cursor but
fixing this is not enough because the cursor should also be updated if
its shape or location changes. Introduce hwc_invalidate() function to
handle that similar to other display controller models.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Message-id: 6970a5e9868b7246656c1d02038dc5d5fa369507.1492787889.git.balaton@eik.bme.hu
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 10 insertions, 15 deletions

diff --git a/hw/display/sm501_template.h b/hw/display/sm501_template.h
index 54807bd..fa0d6a9 100644
--- a/hw/display/sm501_template.h
+++ b/hw/display/sm501_template.h
@@ -92,29 +92,24 @@ static void glue(draw_line32_, PIXEL_NAME)(
 /**
  * Draw hardware cursor image on the given line.
  */
-static void glue(draw_hwc_line_, PIXEL_NAME)(SM501State *s, int crt,
-                 uint8_t *palette, int c_y, uint8_t *d, int width)
+static void glue(draw_hwc_line_, PIXEL_NAME)(uint8_t *d, const uint8_t *s,
+                 int width, const uint8_t *palette, int c_x, int c_y)
 {
-    int x, i;
-    uint8_t *pixval, bitset = 0;
-
-    /* get hardware cursor pattern */
-    uint32_t cursor_addr = get_hwc_address(s, crt);
-    assert(0 <= c_y && c_y < SM501_HWC_HEIGHT);
-    cursor_addr += SM501_HWC_WIDTH * c_y / 4;  /* 4 pixels per byte */
-    pixval = s->local_mem + cursor_addr;
+    int i;
+    uint8_t bitset = 0;
 
     /* get cursor position */
-    x = get_hwc_x(s, crt);
-    d += x * BPP;
+    assert(0 <= c_y && c_y < SM501_HWC_HEIGHT);
+    s += SM501_HWC_WIDTH * c_y / 4;  /* 4 pixels per byte */
+    d += c_x * BPP;
 
-    for (i = 0; i < SM501_HWC_WIDTH && x + i < width; i++) {
+    for (i = 0; i < SM501_HWC_WIDTH && c_x + i < width; i++) {
         uint8_t v;
 
         /* get pixel value */
         if (i % 4 == 0) {
-            bitset = ldub_p(pixval);
-            pixval++;
+            bitset = ldub_p(s);
+            s++;
         }
         v = bitset & 3;
         bitset >>= 2;