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    Subject[PATCH 01/19] drm/fourcc: Add a function to tell if the format embeds alpha
    Date
    There's a bunch of drivers that duplicate the same function to know if a
    particular format embeds an alpha component or not.

    Let's create a helper to avoid duplicating that logic.

    Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
    Cc: Eric Anholt <eric@anholt.net>
    Cc: Inki Dae <inki.dae@samsung.com>
    Cc: Joonyoung Shim <jy0922.shim@samsung.com>
    Cc: Kyungmin Park <kyungmin.park@samsung.com>
    Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
    Cc: Mark Yao <mark.yao@rock-chips.com>
    Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
    Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
    ---
    drivers/gpu/drm/drm_fourcc.c | 43 +++++++++++++++++++++++++++++++++++++-
    include/drm/drm_fourcc.h | 1 +-
    2 files changed, 44 insertions(+)

    diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
    index 9c0152df45ad..6e6227d6a46b 100644
    --- a/drivers/gpu/drm/drm_fourcc.c
    +++ b/drivers/gpu/drm/drm_fourcc.c
    @@ -348,3 +348,46 @@ int drm_format_plane_height(int height, uint32_t format, int plane)
    return height / info->vsub;
    }
    EXPORT_SYMBOL(drm_format_plane_height);
    +
    +/**
    + * drm_format_has_alpha - get whether the format embeds an alpha component
    + * @format: pixel format (DRM_FORMAT_*)
    + *
    + * Returns:
    + * true if the format embeds an alpha component, false otherwise.
    + */
    +bool drm_format_has_alpha(uint32_t format)
    +{
    + switch (format) {
    + case DRM_FORMAT_ARGB4444:
    + case DRM_FORMAT_ABGR4444:
    + case DRM_FORMAT_RGBA4444:
    + case DRM_FORMAT_BGRA4444:
    + case DRM_FORMAT_ARGB1555:
    + case DRM_FORMAT_ABGR1555:
    + case DRM_FORMAT_RGBA5551:
    + case DRM_FORMAT_BGRA5551:
    + case DRM_FORMAT_ARGB8888:
    + case DRM_FORMAT_ABGR8888:
    + case DRM_FORMAT_RGBA8888:
    + case DRM_FORMAT_BGRA8888:
    + case DRM_FORMAT_ARGB2101010:
    + case DRM_FORMAT_ABGR2101010:
    + case DRM_FORMAT_RGBA1010102:
    + case DRM_FORMAT_BGRA1010102:
    + case DRM_FORMAT_AYUV:
    + case DRM_FORMAT_XRGB8888_A8:
    + case DRM_FORMAT_XBGR8888_A8:
    + case DRM_FORMAT_RGBX8888_A8:
    + case DRM_FORMAT_BGRX8888_A8:
    + case DRM_FORMAT_RGB888_A8:
    + case DRM_FORMAT_BGR888_A8:
    + case DRM_FORMAT_RGB565_A8:
    + case DRM_FORMAT_BGR565_A8:
    + return true;
    +
    + default:
    + return false;
    + }
    +}
    +EXPORT_SYMBOL(drm_format_has_alpha);
    diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
    index 6942e84b6edd..e08fc22c5f78 100644
    --- a/include/drm/drm_fourcc.h
    +++ b/include/drm/drm_fourcc.h
    @@ -69,5 +69,6 @@ int drm_format_vert_chroma_subsampling(uint32_t format);
    int drm_format_plane_width(int width, uint32_t format, int plane);
    int drm_format_plane_height(int height, uint32_t format, int plane);
    const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
    +bool drm_format_has_alpha(uint32_t format);

    #endif /* __DRM_FOURCC_H__ */
    --
    git-series 0.9.1
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