diff options
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/drm/drm_mode.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 3693d82b5279..a4bdc4bd11bc 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -27,6 +27,9 @@ #ifndef _DRM_MODE_H #define _DRM_MODE_H +#include <linux/bits.h> +#include <linux/const.h> + #include "drm.h" #if defined(__cplusplus) @@ -1549,6 +1552,83 @@ struct drm_mode_closefb { __u32 pad; }; +/* + * Put 16-bit ARGB values into a standard 64-bit representation that can be + * used for ioctl parameters, inter-driver communication, etc. + * + * If the component values being provided contain less than 16 bits of + * precision, use a conversion ratio to get a better color approximation. + * The ratio is computed as (2^16 - 1) / (2^bpc - 1), where bpc and 16 are + * the input and output precision, respectively. + * Also note bpc must be greater than 0. + */ +#define __DRM_ARGB64_PREP(c, shift) \ + (((__u64)(c) & __GENMASK(15, 0)) << (shift)) + +#define __DRM_ARGB64_PREP_BPC(c, shift, bpc) \ +({ \ + __u16 mask = __GENMASK((bpc) - 1, 0); \ + __u16 conv = __KERNEL_DIV_ROUND_CLOSEST((mask & (c)) * \ + __GENMASK(15, 0), mask);\ + __DRM_ARGB64_PREP(conv, shift); \ +}) + +#define DRM_ARGB64_PREP(alpha, red, green, blue) \ +( \ + __DRM_ARGB64_PREP(alpha, 48) | \ + __DRM_ARGB64_PREP(red, 32) | \ + __DRM_ARGB64_PREP(green, 16) | \ + __DRM_ARGB64_PREP(blue, 0) \ +) + +#define DRM_ARGB64_PREP_BPC(alpha, red, green, blue, bpc) \ +({ \ + __typeof__(bpc) __bpc = bpc; \ + __DRM_ARGB64_PREP_BPC(alpha, 48, __bpc) | \ + __DRM_ARGB64_PREP_BPC(red, 32, __bpc) | \ + __DRM_ARGB64_PREP_BPC(green, 16, __bpc) | \ + __DRM_ARGB64_PREP_BPC(blue, 0, __bpc); \ +}) + +/* + * Extract the specified color component from a standard 64-bit ARGB value. + * + * If the requested precision is less than 16 bits, make use of a conversion + * ratio calculated as (2^bpc - 1) / (2^16 - 1), where bpc and 16 are the + * output and input precision, respectively. + * + * If speed is more important than accuracy, use DRM_ARGB64_GET*_BPCS() + * instead of DRM_ARGB64_GET*_BPC() in order to replace the expensive + * division with a simple bit right-shift operation. + */ +#define __DRM_ARGB64_GET(c, shift) \ + ((__u16)(((__u64)(c) >> (shift)) & __GENMASK(15, 0))) + +#define __DRM_ARGB64_GET_BPC(c, shift, bpc) \ +({ \ + __u16 comp = __DRM_ARGB64_GET(c, shift); \ + __KERNEL_DIV_ROUND_CLOSEST(comp * __GENMASK((bpc) - 1, 0), \ + __GENMASK(15, 0)); \ +}) + +#define __DRM_ARGB64_GET_BPCS(c, shift, bpc) \ + (__DRM_ARGB64_GET(c, shift) >> (16 - (bpc))) + +#define DRM_ARGB64_GETA(c) __DRM_ARGB64_GET(c, 48) +#define DRM_ARGB64_GETR(c) __DRM_ARGB64_GET(c, 32) +#define DRM_ARGB64_GETG(c) __DRM_ARGB64_GET(c, 16) +#define DRM_ARGB64_GETB(c) __DRM_ARGB64_GET(c, 0) + +#define DRM_ARGB64_GETA_BPC(c, bpc) __DRM_ARGB64_GET_BPC(c, 48, bpc) +#define DRM_ARGB64_GETR_BPC(c, bpc) __DRM_ARGB64_GET_BPC(c, 32, bpc) +#define DRM_ARGB64_GETG_BPC(c, bpc) __DRM_ARGB64_GET_BPC(c, 16, bpc) +#define DRM_ARGB64_GETB_BPC(c, bpc) __DRM_ARGB64_GET_BPC(c, 0, bpc) + +#define DRM_ARGB64_GETA_BPCS(c, bpc) __DRM_ARGB64_GET_BPCS(c, 48, bpc) +#define DRM_ARGB64_GETR_BPCS(c, bpc) __DRM_ARGB64_GET_BPCS(c, 32, bpc) +#define DRM_ARGB64_GETG_BPCS(c, bpc) __DRM_ARGB64_GET_BPCS(c, 16, bpc) +#define DRM_ARGB64_GETB_BPCS(c, bpc) __DRM_ARGB64_GET_BPCS(c, 0, bpc) + #if defined(__cplusplus) } #endif |