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SubjectRe: [PATCH] drm/qxl: fix cursor position with non-zero hotspot
On Wed, Nov 18, 2015 at 11:17:25AM +0000, John Keeping wrote:
> The SPICE protocol considers the position of a cursor to be the location
> of its active pixel on the display, so the cursor is drawn with its
> top-left corner at "(x - hot_spot_x, y - hot_spot_y)" but the DRM cursor
> position gives the location where the top-left corner should be drawn,
> with the hotspot being a hint for drivers that need it.
>
> This fixes the location of the window resize cursors when using Fluxbox
> with the QXL DRM driver and both the QXL and modesetting X drivers.
>
> Signed-off-by: John Keeping <john@metanate.com>
> ---
> This comes from the discussion in the thread at [1]. My test
> environment is using:
>
> - X.Org X Server 1.17.4
> - xf86-video-qxl 0.1.4
> - spice-gtk3 0.30
>
> [1] http://lists.freedesktop.org/archives/dri-devel/2015-November/thread.html#94650
>
> drivers/gpu/drm/qxl/qxl_display.c | 13 +++++++++----
> drivers/gpu/drm/qxl/qxl_drv.h | 2 ++
> 2 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
> index 183aea1..5edebf4 100644
> --- a/drivers/gpu/drm/qxl/qxl_display.c
> +++ b/drivers/gpu/drm/qxl/qxl_display.c
> @@ -375,10 +375,15 @@ static int qxl_crtc_cursor_set2(struct drm_crtc *crtc,
>
> qxl_bo_kunmap(user_bo);
>
> + qcrtc->cur_x += qcrtc->hot_spot_x - hot_x;
> + qcrtc->cur_y += qcrtc->hot_spot_y - hot_y;
> + qcrtc->hot_spot_x = hot_x;
> + qcrtc->hot_spot_y = hot_y;

Yay for the artificial split of the legacy driver interface for cursors.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org

Dave, can you pls pick this up if you agree?

Thanks, Daniel

> +
> cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev, release);
> cmd->type = QXL_CURSOR_SET;
> - cmd->u.set.position.x = qcrtc->cur_x;
> - cmd->u.set.position.y = qcrtc->cur_y;
> + cmd->u.set.position.x = qcrtc->cur_x + qcrtc->hot_spot_x;
> + cmd->u.set.position.y = qcrtc->cur_y + qcrtc->hot_spot_y;
>
> cmd->u.set.shape = qxl_bo_physical_address(qdev, cursor_bo, 0);
>
> @@ -441,8 +446,8 @@ static int qxl_crtc_cursor_move(struct drm_crtc *crtc,
>
> cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev, release);
> cmd->type = QXL_CURSOR_MOVE;
> - cmd->u.position.x = qcrtc->cur_x;
> - cmd->u.position.y = qcrtc->cur_y;
> + cmd->u.position.x = qcrtc->cur_x + qcrtc->hot_spot_x;
> + cmd->u.position.y = qcrtc->cur_y + qcrtc->hot_spot_y;
> qxl_release_unmap(qdev, release, &cmd->release_info);
>
> qxl_push_cursor_ring_release(qdev, release, QXL_CMD_CURSOR, false);
> diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
> index 01a8694..3ab9017 100644
> --- a/drivers/gpu/drm/qxl/qxl_drv.h
> +++ b/drivers/gpu/drm/qxl/qxl_drv.h
> @@ -135,6 +135,8 @@ struct qxl_crtc {
> int index;
> int cur_x;
> int cur_y;
> + int hot_spot_x;
> + int hot_spot_y;
> };
>
> struct qxl_output {
> --
> 2.6.3.462.gbe2c914
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch


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