include/drm/drm_color_mgmt.h

   1 /*
   2  * Copyright (c) 2016 Intel Corporation
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22
  23 #ifndef __DRM_COLOR_MGMT_H__
  24 #define __DRM_COLOR_MGMT_H__
  25
  26 #include <linux/ctype.h>
  27 #include <drm/drm_property.h>
  28
  29 struct drm_crtc;
  30 struct drm_plane;
  31
  32 /**
  33  * drm_color_lut_extract - clamp and round LUT entries
  34  * @user_input: input value
  35  * @bit_precision: number of bits the hw LUT supports
  36  *
  37  * Extract a degamma/gamma LUT value provided by user (in the form of
  38  * &drm_color_lut entries) and round it to the precision supported by the
  39  * hardware.
  40  */
  41 static inline u32 drm_color_lut_extract(u32 user_input, int bit_precision)
  42 {
  43         u32 val = user_input;
  44         u32 max = 0xffff >> (16 - bit_precision);
  45
  46         /* Round only if we're not using full precision. */
  47         if (bit_precision < 16) {
  48                 val += 1UL << (16 - bit_precision - 1);
  49                 val >>= 16 - bit_precision;
  50         }
  51
  52         return clamp_val(val, 0, max);
  53 }
  54
  55 u64 drm_color_ctm_s31_32_to_qm_n(u64 user_input, u32 m, u32 n);
  56
  57 void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
  58                                 uint degamma_lut_size,
  59                                 bool has_ctm,
  60                                 uint gamma_lut_size);
  61
  62 int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
  63                                  int gamma_size);
  64
  65 /**
  66  * drm_color_lut_size - calculate the number of entries in the LUT
  67  * @blob: blob containing the LUT
  68  *
  69  * Returns:
  70  * The number of entries in the color LUT stored in @blob.
  71  */
  72 static inline int drm_color_lut_size(const struct drm_property_blob *blob)
  73 {
  74         return blob->length / sizeof(struct drm_color_lut);
  75 }
  76
  77 enum drm_color_encoding {
  78         DRM_COLOR_YCBCR_BT601,
  79         DRM_COLOR_YCBCR_BT709,
  80         DRM_COLOR_YCBCR_BT2020,
  81         DRM_COLOR_ENCODING_MAX,
  82 };
  83
  84 enum drm_color_range {
  85         DRM_COLOR_YCBCR_LIMITED_RANGE,
  86         DRM_COLOR_YCBCR_FULL_RANGE,
  87         DRM_COLOR_RANGE_MAX,
  88 };
  89
  90 int drm_plane_create_color_properties(struct drm_plane *plane,
  91                                       u32 supported_encodings,
  92                                       u32 supported_ranges,
  93                                       enum drm_color_encoding default_encoding,
  94                                       enum drm_color_range default_range);
  95
  96 /**
  97  * enum drm_color_lut_tests - hw-specific LUT tests to perform
  98  *
  99  * The drm_color_lut_check() function takes a bitmask of the values here to
 100  * determine which tests to apply to a userspace-provided LUT.
 101  */
 102 enum drm_color_lut_tests {
 103         /**
 104          * @DRM_COLOR_LUT_EQUAL_CHANNELS:
 105          *
 106          * Checks whether the entries of a LUT all have equal values for the
 107          * red, green, and blue channels.  Intended for hardware that only
 108          * accepts a single value per LUT entry and assumes that value applies
 109          * to all three color components.
 110          */
 111         DRM_COLOR_LUT_EQUAL_CHANNELS = BIT(0),
 112
 113         /**
 114          * @DRM_COLOR_LUT_NON_DECREASING:
 115          *
 116          * Checks whether the entries of a LUT are always flat or increasing
 117          * (never decreasing).
 118          */
 119         DRM_COLOR_LUT_NON_DECREASING = BIT(1),
 120 };
 121
 122 int drm_color_lut_check(const struct drm_property_blob *lut, u32 tests);
 123 #endif