amdgpu/display/display-manager.rst

57 DRM/KMS framework defines three CRTC color correction properties: degamma,
60 pre-blending but DRM/KMS has not per-plane color correction properties.
62 In general, the DRM CRTC color properties are programmed to DC, as follows:
65 color caps available in the hw is not currently exposed by DRM interface and
90 Pixel blend mode is a DRM plane composition property of :c:type:`drm_plane` used to
92 background plane (bg). Here, we present main concepts of DRM blend mode to help
94 this DRM property and the alpha blending equations in :ref:`DRM Plane
106   more in :ref:`DRM Plane Composition Properties <plane_composition_properties>`.
115 DRM has three blend mode to define the blend formula in the plane composition:
126 mode property is created or defined, DRM considers the plane's pixels has
130 The DRM blend mode and its elements are then mapped by AMDGPU display manager
144 multiplied (true/false), being only true for DRM pre-multiplied blend mode.
152 DM then maps the elements of `enum mpcc_alpha_blend_mode` to those in the DRM
155 * *MPC pixel alpha* matches *DRM fg.alpha* as the alpha component value
157 * *MPC global alpha* matches *DRM plane_alpha* when the pixel alpha should
159 * *MPC global gain* assumes *MPC global alpha* value when both *DRM
160   fg.alpha* and *DRM plane_alpha* participate in the blend equation
172 The alpha blending equation is configured from DRM to DC interface by the