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virtio-gpu: fix scanout rectangles

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Commit "ca58b45 ui/virtio-gpu: add and use qemu_create_displaysurface_pixman"
breaks scanouts which use a region of the underlying resource only.

So, we need another way to handle the underlying issue.  Lets create a
new pixman image, grab a reference on the pixman providing the
underlying storage, hook up a destroy callback which releases the
reference.  That way regions work again and releasing the backing
storage should still be impossible thanks to the extra reference we are
holding.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 1464597655-26341-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2016-05-30 10:40:55 +02:00
parent 2c107d7684
commit fa06e5cb7b
1 changed files with 13 additions and 1 deletions
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14
hw/display/virtio-gpu.c
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@ -495,6 +495,11 @@ static void virtio_gpu_resource_flush(VirtIOGPU *g,
pixman_region_fini(&flush_region);
}
static void virtio_unref_resource(pixman_image_t *image, void *data)
{
pixman_image_unref(data);
}
static void virtio_gpu_set_scanout(VirtIOGPU *g,
struct virtio_gpu_ctrl_command *cmd)
{
@ -571,8 +576,15 @@ static void virtio_gpu_set_scanout(VirtIOGPU *g,
!= ((uint8_t *)pixman_image_get_data(res->image) + offset) ||
scanout->width != ss.r.width ||
scanout->height != ss.r.height) {
pixman_image_t *rect;
void *ptr = (uint8_t *)pixman_image_get_data(res->image) + offset;
rect = pixman_image_create_bits(format, ss.r.width, ss.r.height, ptr,
pixman_image_get_stride(res->image));
pixman_image_ref(res->image);
pixman_image_set_destroy_function(rect, virtio_unref_resource,
res->image);
/* realloc the surface ptr */
scanout->ds = qemu_create_displaysurface_pixman(res->image);
scanout->ds = qemu_create_displaysurface_pixman(rect);
if (!scanout->ds) {
cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
return;