[PATCH hwc v2 11/18] drm_hwcomposer: Add utility functions to copy displaycomposition internals

[Sean Paul]

On Wed, Apr 11, 2018 at 04:22:22PM +0100, Alexandru Gheorghe wrote:
> Add utility functions to copy the DrmHwcLayer and DrmCompositionPlanes
> from another DrmDisplayComposition.
> 
> Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe at arm.com>
> ---
>  drmdisplaycomposition.cpp | 29 +++++++++++++++++++++++++++++
>  drmdisplaycomposition.h   |  3 +++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/drmdisplaycomposition.cpp b/drmdisplaycomposition.cpp
> index 66e67a4..dd64f46 100644
> --- a/drmdisplaycomposition.cpp
> +++ b/drmdisplaycomposition.cpp
> @@ -99,6 +99,35 @@ int DrmDisplayComposition::SetLayers(DrmHwcLayer *layers, size_t num_layers,
>    return 0;
>  }
>  
> +int DrmDisplayComposition::CopyLayers(DrmDisplayComposition *src) {
> +  geometry_changed_ = true;
> +  type_ = DRM_COMPOSITION_TYPE_FRAME;
> +  std::shared_ptr<Importer> importer =
> +      drm_->resource_manager()->GetImporter(crtc()->display());
> +  if (!importer) {
> +    ALOGE("Failed to find a valid importer");
> +    return -EINVAL;
> +  }
> +  for (DrmHwcLayer &src_layer : src->layers()) {
> +    DrmHwcLayer copy;
> +    copy.PopulateFromDrmHwcLayer(&src_layer);
> +    int ret = copy.ImportBuffer(importer.get(),
> +                                drm_->resource_manager()->GetGralloc());
> +    if (ret) {
> +      ALOGE("Failed to import buffer ret = %d", ret);
> +      return -EINVAL;
> +    }
> +    layers_.emplace_back(std::move(copy));
> +  }
> +  return 0;
> +}

This seems to do more than just CopyLayers, and it seems quite specialized to
your purpose. Can you do something similar to SquashFrame(), where the new
composition is crafted in context? It might be a little less awkward than
sprinkling in these seemingly generic copy functions.

Sean

> +
> +void DrmDisplayComposition::CopyCompPlanes(DrmDisplayComposition *src) {
> +  for (auto comp_plane : src->composition_planes()) {
> +    composition_planes_.push_back(comp_plane);
> +  }
> +}
> +
>  int DrmDisplayComposition::SetDpmsMode(uint32_t dpms_mode) {
>    if (!validate_composition_type(DRM_COMPOSITION_TYPE_DPMS))
>      return -EINVAL;
> diff --git a/drmdisplaycomposition.h b/drmdisplaycomposition.h
> index 9183925..c646420 100644
> --- a/drmdisplaycomposition.h
> +++ b/drmdisplaycomposition.h
> @@ -68,6 +68,7 @@ class DrmCompositionPlane {
>  
>    DrmCompositionPlane() = default;
>    DrmCompositionPlane(DrmCompositionPlane &&rhs) = default;
> +  DrmCompositionPlane(const DrmCompositionPlane &rhs) = default;
>    DrmCompositionPlane &operator=(DrmCompositionPlane &&other) = default;
>    DrmCompositionPlane(Type type, DrmPlane *plane, DrmCrtc *crtc)
>        : type_(type), plane_(plane), crtc_(crtc) {
> @@ -120,6 +121,8 @@ class DrmDisplayComposition {
>             Planner *planner, uint64_t frame_no);
>  
>    int SetLayers(DrmHwcLayer *layers, size_t num_layers, bool geometry_changed);
> +  int CopyLayers(DrmDisplayComposition *src);
> +  void CopyCompPlanes(DrmDisplayComposition *src);
>    int AddPlaneComposition(DrmCompositionPlane plane);
>    int AddPlaneDisable(DrmPlane *plane);
>    int SetDpmsMode(uint32_t dpms_mode);
> -- 
> 2.7.4
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS