/*
 * Copyright (C) 2019 Red Hat
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include "config.h"

#include "backends/native/meta-kms-crtc.h"
#include "backends/native/meta-kms-crtc-private.h"

#include "backends/native/meta-kms-device-private.h"
#include "backends/native/meta-kms-impl-device.h"
#include "backends/native/meta-kms-update-private.h"

struct _MetaKmsCrtc
{
  GObject parent;

  MetaKmsDevice *device;

  uint32_t id;
  int idx;

  MetaKmsCrtcState current_state;
};

G_DEFINE_TYPE (MetaKmsCrtc, meta_kms_crtc, G_TYPE_OBJECT)

void
meta_kms_crtc_set_gamma (MetaKmsCrtc    *crtc,
                         MetaKmsUpdate  *update,
                         int             size,
                         const uint16_t *red,
                         const uint16_t *green,
                         const uint16_t *blue)
{
  meta_kms_update_set_crtc_gamma (update, crtc, size, red, green, blue);
}

MetaKmsDevice *
meta_kms_crtc_get_device (MetaKmsCrtc *crtc)
{
  return crtc->device;
}

const MetaKmsCrtcState *
meta_kms_crtc_get_current_state (MetaKmsCrtc *crtc)
{
  return &crtc->current_state;
}

uint32_t
meta_kms_crtc_get_id (MetaKmsCrtc *crtc)
{
  return crtc->id;
}

int
meta_kms_crtc_get_idx (MetaKmsCrtc *crtc)
{
  return crtc->idx;
}

static void
read_gamma_state (MetaKmsCrtc       *crtc,
                  MetaKmsImplDevice *impl_device,
                  drmModeCrtc       *drm_crtc)
{
  MetaKmsCrtcState *current_state = &crtc->current_state;

  if (current_state->gamma.size != drm_crtc->gamma_size)
    {
      current_state->gamma.size = drm_crtc->gamma_size;

      current_state->gamma.red = g_realloc_n (current_state->gamma.red,
                                              drm_crtc->gamma_size,
                                              sizeof (uint16_t));
      current_state->gamma.green = g_realloc_n (current_state->gamma.green,
                                                drm_crtc->gamma_size,
                                                sizeof (uint16_t));
      current_state->gamma.blue = g_realloc_n (current_state->gamma.blue,
                                               drm_crtc->gamma_size,
                                               sizeof (uint16_t));
    }

  drmModeCrtcGetGamma (meta_kms_impl_device_get_fd (impl_device),
                       crtc->id,
                       current_state->gamma.size,
                       current_state->gamma.red,
                       current_state->gamma.green,
                       current_state->gamma.blue);
}

static void
meta_kms_crtc_read_state (MetaKmsCrtc       *crtc,
                          MetaKmsImplDevice *impl_device,
                          drmModeCrtc       *drm_crtc)
{
  crtc->current_state = (MetaKmsCrtcState) {
    .rect = {
      .x = drm_crtc->x,
      .y = drm_crtc->y,
      .width = drm_crtc->width,
      .height = drm_crtc->height,
    },
    .is_drm_mode_valid = drm_crtc->mode_valid,
    .drm_mode = drm_crtc->mode,
  };

  read_gamma_state (crtc, impl_device, drm_crtc);
}

void
meta_kms_crtc_update_state (MetaKmsCrtc *crtc)
{
  MetaKmsImplDevice *impl_device;
  drmModeCrtc *drm_crtc;

  impl_device = meta_kms_device_get_impl_device (crtc->device);
  drm_crtc = drmModeGetCrtc (meta_kms_impl_device_get_fd (impl_device),
                             crtc->id);
  meta_kms_crtc_read_state (crtc, impl_device, drm_crtc);
  drmModeFreeCrtc (drm_crtc);
}

MetaKmsCrtc *
meta_kms_crtc_new (MetaKmsImplDevice *impl_device,
                   drmModeCrtc       *drm_crtc,
                   int                idx)
{
  MetaKmsCrtc *crtc;

  crtc = g_object_new (META_TYPE_KMS_CRTC, NULL);
  crtc->device = meta_kms_impl_device_get_device (impl_device);
  crtc->id = drm_crtc->crtc_id;
  crtc->idx = idx;

  return crtc;
}

static void
meta_kms_crtc_finalize (GObject *object)
{
  MetaKmsCrtc *crtc = META_KMS_CRTC (object);

  g_clear_pointer (&crtc->current_state.gamma.red, g_free);
  g_clear_pointer (&crtc->current_state.gamma.green, g_free);
  g_clear_pointer (&crtc->current_state.gamma.blue, g_free);

  G_OBJECT_CLASS (meta_kms_crtc_parent_class)->finalize (object);
}

static void
meta_kms_crtc_init (MetaKmsCrtc *crtc)
{
}

static void
meta_kms_crtc_class_init (MetaKmsCrtcClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->finalize = meta_kms_crtc_finalize;
}