[Qemu-devel] [PATCH v3 0/2] qxl: add support for chunked cursors.

[Qemu-devel] [PATCH v3 0/2] qxl: add support for chunked cursors.

[Gerd Hoffmann]

This series adds support for unpacking qxl chunks, and uses it to
support chunked cursor images.  Windows guest drivers seem to use
that when in HiDPI mode.

Also drop (broken) support for mono cursors.

[ v2: codestyle fixes ]
[ v3: actually squash the codestyle fixes ... ]

Gerd Hoffmann (2):
  qxl: drop mono cursor support
  qxl: add support for chunked cursors.

 hw/display/qxl-render.c | 45 +++++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 16 deletions(-)

-- 
2.9.3

[Qemu-devel] [PATCH v3 1/2] qxl: drop mono cursor support

[Gerd Hoffmann]

The chunk size sanity check in qxl_render_cursor works for
SPICE_CURSOR_TYPE_ALPHA cursors only.  So support for
SPICE_CURSOR_TYPE_MONO cursors must be broken for ages without anyone
noticing.  Most likely it simply isn't used any more by guest drivers.
Drop the dead code.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/qxl-render.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/hw/display/qxl-render.c b/hw/display/qxl-render.c
index 9ad9d9e0f5..e1b3f05ecb 100644
--- a/hw/display/qxl-render.c
+++ b/hw/display/qxl-render.c
@@ -207,7 +207,6 @@ void qxl_render_update_area_done(PCIQXLDevice *qxl, QXLCookie *cookie)
 static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor)
 {
     QEMUCursor *c;
-    uint8_t *image, *mask;
     size_t size;
 
     c = cursor_alloc(cursor->header.width, cursor->header.height);
@@ -221,14 +220,6 @@ static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor)
             cursor_print_ascii_art(c, "qxl/alpha");
         }
         break;
-    case SPICE_CURSOR_TYPE_MONO:
-        mask  = cursor->chunk.data;
-        image = mask + cursor_get_mono_bpl(c) * c->width;
-        cursor_set_mono(c, 0xffffff, 0x000000, image, 1, mask);
-        if (qxl->debug > 2) {
-            cursor_print_ascii_art(c, "qxl/mono");
-        }
-        break;
     default:
         fprintf(stderr, "%s: not implemented: type %d\n",
                 __FUNCTION__, cursor->header.type);
-- 
2.9.3

[Qemu-devel] [PATCH v3 2/2] qxl: add support for chunked cursors.

[Gerd Hoffmann]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/qxl-render.c | 36 +++++++++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/hw/display/qxl-render.c b/hw/display/qxl-render.c
index e1b3f05ecb..90e0865618 100644
--- a/hw/display/qxl-render.c
+++ b/hw/display/qxl-render.c
@@ -204,7 +204,33 @@ void qxl_render_update_area_done(PCIQXLDevice *qxl, QXLCookie *cookie)
     g_free(cookie);
 }
 
-static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor)
+static void qxl_unpack_chunks(void *dest, size_t size, PCIQXLDevice *qxl,
+                              QXLDataChunk *chunk, uint32_t group_id)
+{
+    uint32_t max_chunks = 32;
+    size_t offset = 0;
+    size_t bytes;
+
+    for (;;) {
+        bytes = MIN(size - offset, chunk->data_size);
+        memcpy(dest + offset, chunk->data, bytes);
+        offset += bytes;
+        if (offset == size) {
+            return;
+        }
+        chunk = qxl_phys2virt(qxl, chunk->next_chunk, group_id);
+        if (!chunk) {
+            return;
+        }
+        max_chunks--;
+        if (max_chunks == 0) {
+            return;
+        }
+    }
+}
+
+static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor,
+                              uint32_t group_id)
 {
     QEMUCursor *c;
     size_t size;
@@ -215,7 +241,7 @@ static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor)
     switch (cursor->header.type) {
     case SPICE_CURSOR_TYPE_ALPHA:
         size = sizeof(uint32_t) * cursor->header.width * cursor->header.height;
-        memcpy(c->data, cursor->chunk.data, size);
+        qxl_unpack_chunks(c->data, size, qxl, &cursor->chunk, group_id);
         if (qxl->debug > 2) {
             cursor_print_ascii_art(c, "qxl/alpha");
         }
@@ -259,11 +285,7 @@ int qxl_render_cursor(PCIQXLDevice *qxl, QXLCommandExt *ext)
         if (!cursor) {
             return 1;
         }
-        if (cursor->chunk.data_size != cursor->data_size) {
-            fprintf(stderr, "%s: multiple chunks\n", __FUNCTION__);
-            return 1;
-        }
-        c = qxl_cursor(qxl, cursor);
+        c = qxl_cursor(qxl, cursor, ext->group_id);
         if (c == NULL) {
             c = cursor_builtin_left_ptr();
         }
-- 
2.9.3