text: /*
   * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   */
  
  /** \file
   * \ingroup bke
   */
  
  #include "MEM_guardedalloc.h"
  
  #include "DNA_brush_types.h"
  #include "DNA_defaults.h"
  #include "DNA_gpencil_types.h"
  #include "DNA_object_types.h"
  #include "DNA_scene_types.h"
  
  #include "BLI_listbase.h"
  #include "BLI_math.h"
  #include "BLI_rand.h"
  
  #include "BLT_translation.h"
  
  #include "BKE_brush.h"
  #include "BKE_colortools.h"
  #include "BKE_context.h"
  #include "BKE_icons.h"
  #include "BKE_idtype.h"
  #include "BKE_lib_id.h"
  #include "BKE_lib_query.h"
  #include "BKE_lib_remap.h"
  #include "BKE_main.h"
  #include "BKE_material.h"
  #include "BKE_paint.h"
  #include "BKE_texture.h"
  
  #include "IMB_colormanagement.h"
  #include "IMB_imbuf.h"
  #include "IMB_imbuf_types.h"
  
  #include "RE_render_ext.h" /* RE_texture_evaluate */
  
  static void brush_init_data(ID *id)
  {
    Brush *brush = (Brush *)id;
    BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(brush, id));
  
    MEMCPY_STRUCT_AFTER(brush, DNA_struct_default_get(Brush), id);
  
    /* enable fake user by default */
    id_fake_user_set(&brush->id);
  
    /* the default alpha falloff curve */
    BKE_brush_curve_preset(brush, CURVE_PRESET_SMOOTH);
  }
  
  static void brush_copy_data(Main *UNUSED(bmain), ID *id_dst, const ID *id_src, const int flag)
  {
    Brush *brush_dst = (Brush *)id_dst;
    const Brush *brush_src = (const Brush *)id_src;
    if (brush_src->icon_imbuf) {
      brush_dst->icon_imbuf = IMB_dupImBuf(brush_src->icon_imbuf);
    }
  
    if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
      BKE_previewimg_id_copy(&brush_dst->id, &brush_src->id);
    }
    else {
      brush_dst->preview = NULL;
    }
  
    brush_dst->curve = BKE_curvemapping_copy(brush_src->curve);
    if (brush_src->gpencil_settings != NULL) {
      brush_dst->gpencil_settings = MEM_dupallocN(brush_src->gpencil_settings);
      brush_dst->gpencil_settings->curve_sensitivity = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_sensitivity);
      brush_dst->gpencil_settings->curve_strength = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_strength);
      brush_dst->gpencil_settings->curve_jitter = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_jitter);
  
      brush_dst->gpencil_settings->curve_rand_pressure = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_rand_pressure);
      brush_dst->gpencil_settings->curve_rand_strength = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_rand_strength);
      brush_dst->gpencil_settings->curve_rand_uv = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_rand_uv);
      brush_dst->gpencil_settings->curve_rand_hue = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_rand_hue);
      brush_dst->gpencil_settings->curve_rand_saturation = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_rand_saturation);
      brush_dst->gpencil_settings->curve_rand_value = BKE_curvemapping_copy(
          brush_src->gpencil_settings->curve_rand_value);
    }
  
    /* enable fake user by default */
    id_fake_user_set(&brush_dst->id);
  }
  
  static void brush_free_data(ID *id)
  {
    Brush *brush = (Brush *)id;
    if (brush->icon_imbuf) {
      IMB_freeImBuf(brush->icon_imbuf);
    }
    BKE_curvemapping_free(brush->curve);
  
    if (brush->gpencil_settings != NULL) {
      BKE_curvemapping_free(brush->gpencil_settings->curve_sensitivity);
      BKE_curvemapping_free(brush->gpencil_settings->curve_strength);
      BKE_curvemapping_free(brush->gpencil_settings->curve_jitter);
  
      BKE_curvemapping_free(brush->gpencil_settings->curve_rand_pressure);
      BKE_curvemapping_free(brush->gpencil_settings->curve_rand_strength);
      BKE_curvemapping_free(brush->gpencil_settings->curve_rand_uv);
      BKE_curvemapping_free(brush->gpencil_settings->curve_rand_hue);
      BKE_curvemapping_free(brush->gpencil_settings->curve_rand_saturation);
      BKE_curvemapping_free(brush->gpencil_settings->curve_rand_value);
  
      MEM_SAFE_FREE(brush->gpencil_settings);
    }
  
    MEM_SAFE_FREE(brush->gradient);
  
    BKE_previewimg_free(&(brush->preview));
  }
  
  static void brush_make_local(Main *bmain, ID *id, const int flags)
  {
    Brush *brush = (Brush *)id;
    const bool lib_local = (flags & LIB_ID_MAKELOCAL_FULL_LIBRARY) != 0;
    bool is_local = false, is_lib = false;
  
    /* - only lib users: do nothing (unless force_local is set)
     * - only local users: set flag
     * - mixed: make copy
     */
  
    if (!ID_IS_LINKED(brush)) {
      return;
    }
  
    if (brush->clone.image) {
      /* Special case: ima always local immediately. Clone image should only have one user anyway. */
      BKE_lib_id_make_local(bmain, &brush->clone.image->id, false, 0);
    }
  
    BKE_library_ID_test_usages(bmain, brush, &is_local, &is_lib);
  
    if (lib_local || is_local) {
      if (!is_lib) {
        BKE_lib_id_clear_library_data(bmain, &brush->id);
        BKE_lib_id_expand_local(bmain, &brush->id);
  
        /* enable fake user by default */
        id_fake_user_set(&brush->id);
      }
      else {
        Brush *brush_new = BKE_brush_copy(bmain, brush); /* Ensures FAKE_USER is set */
  
        brush_new->id.us = 0;
  
        /* setting newid is mandatory for complex make_lib_local logic... */
        ID_NEW_SET(brush, brush_new);
  
        if (!lib_local) {
          BKE_libblock_remap(bmain, brush, brush_new, ID_REMAP_SKIP_INDIRECT_USAGE);
        }
      }
    }
  }
  
  static void brush_foreach_id(ID *id, LibraryForeachIDData *data)
  {
    Brush *brush = (Brush *)id;
  
    BKE_LIB_FOREACHID_PROCESS(data, brush->toggle_brush, IDWALK_CB_NOP);
    BKE_LIB_FOREACHID_PROCESS(data, brush->clone.image, IDWALK_CB_NOP);
    BKE_LIB_FOREACHID_PROCESS(data, brush->paint_curve, IDWALK_CB_USER);
    if (brush->gpencil_settings) {
      BKE_LIB_FOREACHID_PROCESS(data, brush->gpencil_settings->material, IDWALK_CB_USER);
    }
    BKE_texture_mtex_foreach_id(data, &brush->mtex);
    BKE_texture_mtex_foreach_id(data, &brush->mask_mtex);
  }
  
  IDTypeInfo IDType_ID_BR = {
      .id_code = ID_BR,
      .id_filter = FILTER_ID_BR,
      .main_listbase_index = INDEX_ID_BR,
      .struct_size = sizeof(Brush),
      .name = "Brush",
      .name_plural = "brushes",
      .translation_context = BLT_I18NCONTEXT_ID_BRUSH,
      .flags = 0,
  
      .init_data = brush_init_data,
      .copy_data = brush_copy_data,
      .free_data = brush_free_data,
      .make_local = brush_make_local,
      .foreach_id = brush_foreach_id,
  };
  
  static RNG *brush_rng;
  
  void BKE_brush_system_init(void)
  {
    brush_rng = BLI_rng_new(0);
    BLI_rng_srandom(brush_rng, 31415682);
  }
  
  void BKE_brush_system_exit(void)
  {
    if (brush_rng == NULL) {
      return;
    }
    BLI_rng_free(brush_rng);
    brush_rng = NULL;
  }
  
  static void brush_defaults(Brush *brush)
  {
  
    const Brush *brush_def = DNA_struct_default_get(Brush);
  
  #define FROM_DEFAULT(member) memcpy(&brush->member, &brush_def->member, sizeof(brush->member))
  #define FROM_DEFAULT_PTR(member) memcpy(brush->member, brush_def->member, sizeof(brush->member))
  
    FROM_DEFAULT(blend);
    FROM_DEFAULT(flag);
    FROM_DEFAULT(weight);
    FROM_DEFAULT(size);
    FROM_DEFAULT(alpha);
    FROM_DEFAULT(hardness);
    FROM_DEFAULT(autosmooth_factor);
    FROM_DEFAULT(topology_rake_factor);
    FROM_DEFAULT(crease_pinch_factor);
    FROM_DEFAULT(normal_radius_factor);
    FROM_DEFAULT(area_radius_factor);
    FROM_DEFAULT(disconnected_distance_max);
    FROM_DEFAULT(sculpt_plane);
    FROM_DEFAULT(plane_offset);
    FROM_DEFAULT(clone.alpha);
    FROM_DEFAULT(normal_weight);
    FROM_DEFAULT(fill_threshold);
    FROM_DEFAULT(flag);
    FROM_DEFAULT(sampling_flag);
    FROM_DEFAULT_PTR(rgb);
    FROM_DEFAULT_PTR(secondary_rgb);
    FROM_DEFAULT(spacing);
    FROM_DEFAULT(smooth_stroke_radius);
    FROM_DEFAULT(smooth_stroke_factor);
    FROM_DEFAULT(rate);
    FROM_DEFAULT(jitter);
    FROM_DEFAULT(texture_sample_bias);
    FROM_DEFAULT(texture_overlay_alpha);
    FROM_DEFAULT(mask_overlay_alpha);
    FROM_DEFAULT(cursor_overlay_alpha);
    FROM_DEFAULT(overlay_flags);
    FROM_DEFAULT_PTR(add_col);
    FROM_DEFAULT_PTR(sub_col);
    FROM_DEFAULT(stencil_pos);
    FROM_DEFAULT(stencil_dimension);
    FROM_DEFAULT(mtex);
    FROM_DEFAULT(mask_mtex);
  
  #undef FROM_DEFAULT
  #undef FROM_DEFAULT_PTR
  }
  
  /* Datablock add/copy/free/make_local */
  
  /**
   * \note Resulting brush will have two users: one as a fake user,
   * another is assumed to be used by the caller.
   */
  Brush *BKE_brush_add(Main *bmain, const char *name, const eObjectMode ob_mode)
  {
    Brush *brush;
  
    brush = BKE_libblock_alloc(bmain, ID_BR, name, 0);
  
    brush_init_data(&brush->id);
  
    brush->ob_mode = ob_mode;
  
    return brush;
  }
  
  /* add grease pencil settings */
  void BKE_brush_init_gpencil_settings(Brush *brush)
  {
    if (brush->gpencil_settings == NULL) {
      brush->gpencil_settings = MEM_callocN(sizeof(BrushGpencilSettings), "BrushGpencilSettings");
    }
  
    brush->gpencil_settings->draw_smoothlvl = 1;
    brush->gpencil_settings->flag = 0;
    brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
    brush->gpencil_settings->draw_strength = 1.0f;
    brush->gpencil_settings->draw_jitter = 0.0f;
    brush->gpencil_settings->flag |= GP_BRUSH_USE_JITTER_PRESSURE;
    brush->gpencil_settings->icon_id = GP_BRUSH_ICON_PEN;
  
    /* curves */
    brush->gpencil_settings->curve_sensitivity = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
    brush->gpencil_settings->curve_strength = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
    brush->gpencil_settings->curve_jitter = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
  
    brush->gpencil_settings->curve_rand_pressure = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
    brush->gpencil_settings->curve_rand_strength = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
    brush->gpencil_settings->curve_rand_uv = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
    brush->gpencil_settings->curve_rand_hue = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
    brush->gpencil_settings->curve_rand_saturation = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
    brush->gpencil_settings->curve_rand_value = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
  }
  
  /* add a new gp-brush */
  Brush *BKE_brush_add_gpencil(Main *bmain, ToolSettings *ts, const char *name, eObjectMode mode)
  {
    Paint *paint = NULL;
    Brush *brush;
    switch (mode) {
      case OB_MODE_PAINT_GPENCIL: {
        paint = &ts->gp_paint->paint;
        break;
      }
      case OB_MODE_SCULPT_GPENCIL: {
        paint = &ts->gp_sculptpaint->paint;
        break;
      }
      case OB_MODE_WEIGHT_GPENCIL: {
        paint = &ts->gp_weightpaint->paint;
        break;
      }
      case OB_MODE_VERTEX_GPENCIL: {
        paint = &ts->gp_vertexpaint->paint;
        break;
      }
      default:
        paint = &ts->gp_paint->paint;
    }
  
    brush = BKE_brush_add(bmain, name, mode);
  
    BKE_paint_brush_set(paint, brush);
    id_us_min(&brush->id);
  
    brush->size = 3;
  
    /* grease pencil basic settings */
    BKE_brush_init_gpencil_settings(brush);
  
    /* return brush */
    return brush;
  }
  
  /* Delete a Brush. */
  bool BKE_brush_delete(Main *bmain, Brush *brush)
  {
    if (brush->id.tag & LIB_TAG_INDIRECT) {
      return false;
    }
    if (BKE_library_ID_is_indirectly_used(bmain, brush) && ID_REAL_USERS(brush) <= 1 &&
        ID_EXTRA_USERS(brush) == 0) {
      return false;
    }
  
    BKE_id_delete(bmain, brush);
  
    return true;
  }
  
  /* grease pencil cumapping->preset */
  typedef enum eGPCurveMappingPreset {
    GPCURVE_PRESET_PENCIL = 0,
    GPCURVE_PRESET_INK = 1,
    GPCURVE_PRESET_INKNOISE = 2,
    GPCURVE_PRESET_MARKER = 3,
    GPCURVE_PRESET_CHISEL_SENSIVITY = 4,
    GPCURVE_PRESET_CHISEL_STRENGTH = 5,
  } eGPCurveMappingPreset;
  
  static void brush_gpencil_curvemap_reset(CurveMap *cuma, int tot, int preset)
  {
    if (cuma->curve) {
      MEM_freeN(cuma->curve);
    }
  
    cuma->totpoint = tot;
    cuma->curve = MEM_callocN(cuma->totpoint * sizeof(CurveMapPoint), __func__);
  
    switch (preset) {
      case GPCURVE_PRESET_PENCIL:
        cuma->curve[0].x = 0.0f;
        cuma->curve[0].y = 0.0f;
        cuma->curve[1].x = 0.75115f;
        cuma->curve[1].y = 0.25f;
        cuma->curve[2].x = 1.0f;
        cuma->curve[2].y = 1.0f;
        break;
      case GPCURVE_PRESET_INK:
        cuma->curve[0].x = 0.0f;
        cuma->curve[0].y = 0.0f;
        cuma->curve[1].x = 0.63448f;
        cuma->curve[1].y = 0.375f;
        cuma->curve[2].x = 1.0f;
        cuma->curve[2].y = 1.0f;
        break;
      case GPCURVE_PRESET_INKNOISE:
        cuma->curve[0].x = 0.0f;
        cuma->curve[0].y = 0.0f;
        cuma->curve[1].x = 0.55f;
        cuma->curve[1].y = 0.45f;
        cuma->curve[2].x = 0.85f;
        cuma->curve[2].y = 1.0f;
        break;
      case GPCURVE_PRESET_MARKER:
        cuma->curve[0].x = 0.0f;
        cuma->curve[0].y = 0.0f;
        cuma->curve[1].x = 0.38f;
        cuma->curve[1].y = 0.22f;
        cuma->curve[2].x = 0.65f;
        cuma->curve[2].y = 0.68f;
        cuma->curve[3].x = 1.0f;
        cuma->curve[3].y = 1.0f;
        break;
      case GPCURVE_PRESET_CHISEL_SENSIVITY:
        cuma->curve[0].x = 0.0f;
        cuma->curve[0].y = 0.0f;
        cuma->curve[1].x = 0.25f;
        cuma->curve[1].y = 0.40f;
        cuma->curve[2].x = 1.0f;
        cuma->curve[2].y = 1.0f;
        break;
      case GPCURVE_PRESET_CHISEL_STRENGTH:
        cuma->curve[0].x = 0.0f;
        cuma->curve[0].y = 0.0f;
        cuma->curve[1].x = 0.31f;
        cuma->curve[1].y = 0.22f;
        cuma->curve[2].x = 0.61f;
        cuma->curve[2].y = 0.88f;
        cuma->curve[3].x = 1.0f;
        cuma->curve[3].y = 1.0f;
        break;
      default:
        break;
    }
  
    if (cuma->table) {
      MEM_freeN(cuma->table);
      cuma->table = NULL;
    }
  }
  
  void BKE_gpencil_brush_preset_set(Main *bmain, Brush *brush, const short type)
  {
  #define SMOOTH_STROKE_RADIUS 40
  #define SMOOTH_STROKE_FACTOR 0.9f
  #define ACTIVE_SMOOTH 0.35f
  
    CurveMapping *custom_curve = NULL;
  
    /* Set general defaults at brush level. */
    brush->smooth_stroke_radius = SMOOTH_STROKE_RADIUS;
    brush->smooth_stroke_factor = SMOOTH_STROKE_FACTOR;
  
    brush->rgb[0] = 0.498f;
    brush->rgb[1] = 1.0f;
    brush->rgb[2] = 0.498f;
  
    brush->secondary_rgb[0] = 1.0f;
    brush->secondary_rgb[1] = 1.0f;
    brush->secondary_rgb[2] = 1.0f;
  
    brush->curve_preset = BRUSH_CURVE_SMOOTH;
  
    if (brush->gpencil_settings == NULL) {
      return;
    }
  
    /* Set preset type. */
    brush->gpencil_settings->preset_type = type;
  
    /* Set vertex mix factor. */
    brush->gpencil_settings->vertex_mode = GPPAINT_MODE_BOTH;
    brush->gpencil_settings->vertex_factor = 1.0f;
  
    switch (type) {
      case GP_BRUSH_PRESET_AIRBRUSH: {
        brush->size = 300.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.4f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        brush->gpencil_settings->input_samples = 10;
        brush->gpencil_settings->active_smooth = ACTIVE_SMOOTH;
        brush->gpencil_settings->draw_angle = 0.0f;
        brush->gpencil_settings->draw_angle_factor = 0.0f;
        brush->gpencil_settings->hardeness = 0.9f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
  
        brush->gpencil_tool = GPAINT_TOOL_DRAW;
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_AIRBRUSH;
  
        /* Create and link Black Dots material to brush.
         * This material is required because the brush uses the material to define how the stroke is
         * drawn. */
        Material *ma = BLI_findstring(&bmain->materials, "Dots Stroke", offsetof(ID, name) + 2);
        if (ma == NULL) {
          ma = BKE_gpencil_material_add(bmain, "Dots Stroke");
          ma->gp_style->mode = GP_MATERIAL_MODE_DOT;
        }
        brush->gpencil_settings->material = ma;
        /* Pin the matterial to the brush. */
        brush->gpencil_settings->flag |= GP_BRUSH_MATERIAL_PINNED;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_INK_PEN: {
  
        brush->size = 60.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 1.0f;
  
        brush->gpencil_settings->input_samples = 10;
        brush->gpencil_settings->active_smooth = ACTIVE_SMOOTH;
        brush->gpencil_settings->draw_angle = 0.0f;
        brush->gpencil_settings->draw_angle_factor = 0.0f;
        brush->gpencil_settings->hardeness = 1.0f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
  
        brush->gpencil_settings->flag |= GP_BRUSH_GROUP_SETTINGS;
        brush->gpencil_settings->draw_smoothfac = 0.1f;
        brush->gpencil_settings->draw_smoothlvl = 1;
        brush->gpencil_settings->draw_subdivide = 0;
        brush->gpencil_settings->simplify_f = 0.002f;
  
        brush->gpencil_settings->draw_random_press = 0.0f;
        brush->gpencil_settings->draw_jitter = 0.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_JITTER_PRESSURE;
  
        /* Curve. */
        custom_curve = brush->gpencil_settings->curve_sensitivity;
        BKE_curvemapping_set_defaults(custom_curve, 0, 0.0f, 0.0f, 1.0f, 1.0f);
        BKE_curvemapping_initialize(custom_curve);
        brush_gpencil_curvemap_reset(custom_curve->cm, 3, GPCURVE_PRESET_INK);
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_INK;
        brush->gpencil_tool = GPAINT_TOOL_DRAW;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_INK_PEN_ROUGH: {
        brush->size = 60.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 1.0f;
  
        brush->gpencil_settings->input_samples = 10;
        brush->gpencil_settings->active_smooth = ACTIVE_SMOOTH;
        brush->gpencil_settings->draw_angle = 0.0f;
        brush->gpencil_settings->draw_angle_factor = 0.0f;
        brush->gpencil_settings->hardeness = 1.0f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
  
        brush->gpencil_settings->flag &= ~GP_BRUSH_GROUP_SETTINGS;
        brush->gpencil_settings->draw_smoothfac = 0.0f;
        brush->gpencil_settings->draw_smoothlvl = 2;
        brush->gpencil_settings->draw_subdivide = 0;
        brush->gpencil_settings->simplify_f = 0.000f;
  
        brush->gpencil_settings->flag |= GP_BRUSH_GROUP_RANDOM;
        brush->gpencil_settings->draw_random_press = 0.6f;
        brush->gpencil_settings->draw_random_strength = 0.0f;
        brush->gpencil_settings->draw_jitter = 0.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_JITTER_PRESSURE;
  
        /* Curve. */
        custom_curve = brush->gpencil_settings->curve_sensitivity;
        BKE_curvemapping_set_defaults(custom_curve, 0, 0.0f, 0.0f, 1.0f, 1.0f);
        BKE_curvemapping_initialize(custom_curve);
        brush_gpencil_curvemap_reset(custom_curve->cm, 3, GPCURVE_PRESET_INKNOISE);
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_INKNOISE;
        brush->gpencil_tool = GPAINT_TOOL_DRAW;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_MARKER_BOLD: {
        brush->size = 150.0f;
        brush->gpencil_settings->flag &= ~GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.3f;
  
        brush->gpencil_settings->input_samples = 10;
        brush->gpencil_settings->active_smooth = ACTIVE_SMOOTH;
        brush->gpencil_settings->draw_angle = 0.0f;
        brush->gpencil_settings->draw_angle_factor = 0.0f;
        brush->gpencil_settings->hardeness = 1.0f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
  
        brush->gpencil_settings->flag |= GP_BRUSH_GROUP_SETTINGS;
        brush->gpencil_settings->draw_smoothfac = 0.1f;
        brush->gpencil_settings->draw_smoothlvl = 1;
        brush->gpencil_settings->draw_subdivide = 0;
        brush->gpencil_settings->simplify_f = 0.002f;
  
        brush->gpencil_settings->flag &= ~GP_BRUSH_GROUP_RANDOM;
        brush->gpencil_settings->draw_random_press = 0.0f;
        brush->gpencil_settings->draw_random_strength = 0.0f;
        brush->gpencil_settings->draw_jitter = 0.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_JITTER_PRESSURE;
  
        /* Curve. */
        custom_curve = brush->gpencil_settings->curve_sensitivity;
        BKE_curvemapping_set_defaults(custom_curve, 0, 0.0f, 0.0f, 1.0f, 1.0f);
        BKE_curvemapping_initialize(custom_curve);
        brush_gpencil_curvemap_reset(custom_curve->cm, 4, GPCURVE_PRESET_MARKER);
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_MARKER;
        brush->gpencil_tool = GPAINT_TOOL_DRAW;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_MARKER_CHISEL: {
        brush->size = 150.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 1.0f;
  
        brush->gpencil_settings->input_samples = 10;
        brush->gpencil_settings->active_smooth = 0.3f;
        brush->gpencil_settings->draw_angle = DEG2RAD(35.0f);
        brush->gpencil_settings->draw_angle_factor = 0.5f;
        brush->gpencil_settings->hardeness = 1.0f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
  
        brush->gpencil_settings->flag |= GP_BRUSH_GROUP_SETTINGS;
        brush->gpencil_settings->draw_smoothfac = 0.0f;
        brush->gpencil_settings->draw_smoothlvl = 1;
        brush->gpencil_settings->draw_subdivide = 0;
        brush->gpencil_settings->simplify_f = 0.002f;
  
        brush->gpencil_settings->flag &= ~GP_BRUSH_GROUP_RANDOM;
        brush->gpencil_settings->draw_random_press = 0.0f;
        brush->gpencil_settings->draw_jitter = 0.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_JITTER_PRESSURE;
  
        /* Curve. */
        custom_curve = brush->gpencil_settings->curve_sensitivity;
        BKE_curvemapping_set_defaults(custom_curve, 0, 0.0f, 0.0f, 1.0f, 1.0f);
        BKE_curvemapping_initialize(custom_curve);
        brush_gpencil_curvemap_reset(custom_curve->cm, 3, GPCURVE_PRESET_CHISEL_SENSIVITY);
  
        custom_curve = brush->gpencil_settings->curve_strength;
        BKE_curvemapping_set_defaults(custom_curve, 0, 0.0f, 0.0f, 1.0f, 1.0f);
        BKE_curvemapping_initialize(custom_curve);
        brush_gpencil_curvemap_reset(custom_curve->cm, 4, GPCURVE_PRESET_CHISEL_STRENGTH);
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_CHISEL;
        brush->gpencil_tool = GPAINT_TOOL_DRAW;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_PEN: {
        brush->size = 25.0f;
        brush->gpencil_settings->flag &= ~GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 1.0f;
        brush->gpencil_settings->flag &= ~GP_BRUSH_USE_STENGTH_PRESSURE;
  
        brush->gpencil_settings->input_samples = 10;
        brush->gpencil_settings->active_smooth = ACTIVE_SMOOTH;
        brush->gpencil_settings->draw_angle = 0.0f;
        brush->gpencil_settings->draw_angle_factor = 0.0f;
        brush->gpencil_settings->hardeness = 1.0f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
  
        brush->gpencil_settings->flag |= GP_BRUSH_GROUP_SETTINGS;
        brush->gpencil_settings->draw_smoothfac = 0.0f;
        brush->gpencil_settings->draw_smoothlvl = 1;
        brush->gpencil_settings->draw_subdivide = 1;
        brush->gpencil_settings->simplify_f = 0.002f;
  
        brush->gpencil_settings->draw_random_press = 0.0f;
        brush->gpencil_settings->draw_random_strength = 0.0f;
        brush->gpencil_settings->draw_jitter = 0.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_JITTER_PRESSURE;
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_PEN;
        brush->gpencil_tool = GPAINT_TOOL_DRAW;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_PENCIL_SOFT: {
        brush->size = 80.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.4f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        brush->gpencil_settings->input_samples = 10;
        brush->gpencil_settings->active_smooth = ACTIVE_SMOOTH;
        brush->gpencil_settings->draw_angle = 0.0f;
        brush->gpencil_settings->draw_angle_factor = 0.0f;
        brush->gpencil_settings->hardeness = 0.8f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
  
        brush->gpencil_settings->flag |= GP_BRUSH_GROUP_SETTINGS;
        brush->gpencil_settings->draw_smoothfac = 0.0f;
        brush->gpencil_settings->draw_smoothlvl = 1;
        brush->gpencil_settings->draw_subdivide = 0;
        brush->gpencil_settings->simplify_f = 0.000f;
  
        brush->gpencil_settings->draw_random_press = 0.0f;
        brush->gpencil_settings->draw_random_strength = 0.0f;
        brush->gpencil_settings->draw_jitter = 0.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_JITTER_PRESSURE;
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_PENCIL;
        brush->gpencil_tool = GPAINT_TOOL_DRAW;
  
        /* Create and link Black Dots material to brush.
         * This material is required because the brush uses the material to define how the stroke is
         * drawn. */
        Material *ma = BLI_findstring(&bmain->materials, "Dots Stroke", offsetof(ID, name) + 2);
        if (ma == NULL) {
          ma = BKE_gpencil_material_add(bmain, "Dots Stroke");
          ma->gp_style->mode = GP_MATERIAL_MODE_DOT;
        }
        brush->gpencil_settings->material = ma;
        /* Pin the matterial to the brush. */
        brush->gpencil_settings->flag |= GP_BRUSH_MATERIAL_PINNED;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_PENCIL: {
        brush->size = 20.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.6f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        brush->gpencil_settings->input_samples = 10;
        brush->gpencil_settings->active_smooth = ACTIVE_SMOOTH;
        brush->gpencil_settings->draw_angle = 0.0f;
        brush->gpencil_settings->draw_angle_factor = 0.0f;
        brush->gpencil_settings->hardeness = 1.0f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
  
        brush->gpencil_settings->flag |= GP_BRUSH_GROUP_SETTINGS;
        brush->gpencil_settings->draw_smoothfac = 0.0f;
        brush->gpencil_settings->draw_smoothlvl = 1;
        brush->gpencil_settings->draw_subdivide = 0;
        brush->gpencil_settings->simplify_f = 0.002f;
  
        brush->gpencil_settings->draw_random_press = 0.0f;
        brush->gpencil_settings->draw_jitter = 0.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_JITTER_PRESSURE;
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_PENCIL;
        brush->gpencil_tool = GPAINT_TOOL_DRAW;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_FILL_AREA: {
        brush->size = 20.0f;
  
        brush->gpencil_settings->fill_leak = 3;
        brush->gpencil_settings->fill_threshold = 0.1f;
        brush->gpencil_settings->fill_simplylvl = 1;
        brush->gpencil_settings->fill_factor = 1;
  
        brush->gpencil_settings->draw_strength = 1.0f;
        brush->gpencil_settings->hardeness = 1.0f;
        copy_v2_fl(brush->gpencil_settings->aspect_ratio, 1.0f);
        brush->gpencil_settings->draw_smoothfac = 0.1f;
        brush->gpencil_settings->draw_smoothlvl = 1;
        brush->gpencil_settings->draw_subdivide = 1;
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_FILL;
        brush->gpencil_tool = GPAINT_TOOL_FILL;
        brush->gpencil_settings->vertex_mode = GPPAINT_MODE_FILL;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_ERASER_SOFT: {
        brush->size = 30.0f;
        brush->gpencil_settings->draw_strength = 0.5f;
        brush->gpencil_settings->flag |= GP_BRUSH_DEFAULT_ERASER;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_ERASE_SOFT;
        brush->gpencil_tool = GPAINT_TOOL_ERASE;
        brush->gpencil_settings->eraser_mode = GP_BRUSH_ERASER_SOFT;
        brush->gpencil_settings->era_strength_f = 100.0f;
        brush->gpencil_settings->era_thickness_f = 10.0f;
  
        break;
      }
      case GP_BRUSH_PRESET_ERASER_HARD: {
        brush->size = 30.0f;
        brush->gpencil_settings->draw_strength = 1.0f;
        brush->gpencil_settings->eraser_mode = GP_BRUSH_ERASER_SOFT;
        brush->gpencil_settings->era_strength_f = 100.0f;
        brush->gpencil_settings->era_thickness_f = 50.0f;
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_ERASE_HARD;
        brush->gpencil_tool = GPAINT_TOOL_ERASE;
  
        break;
      }
      case GP_BRUSH_PRESET_ERASER_POINT: {
        brush->size = 30.0f;
        brush->gpencil_settings->eraser_mode = GP_BRUSH_ERASER_HARD;
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_ERASE_HARD;
        brush->gpencil_tool = GPAINT_TOOL_ERASE;
  
        break;
      }
      case GP_BRUSH_PRESET_ERASER_STROKE: {
        brush->size = 30.0f;
        brush->gpencil_settings->eraser_mode = GP_BRUSH_ERASER_STROKE;
  
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_ERASE_STROKE;
        brush->gpencil_tool = GPAINT_TOOL_ERASE;
  
        break;
      }
      case GP_BRUSH_PRESET_TINT: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_TINT;
        brush->gpencil_tool = GPAINT_TOOL_TINT;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.8f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_VERTEX_DRAW: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_VERTEX_DRAW;
        brush->gpencil_vertex_tool = GPVERTEX_TOOL_DRAW;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.8f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_VERTEX_BLUR: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_VERTEX_BLUR;
        brush->gpencil_vertex_tool = GPVERTEX_TOOL_BLUR;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.8f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_VERTEX_AVERAGE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_VERTEX_AVERAGE;
        brush->gpencil_vertex_tool = GPVERTEX_TOOL_AVERAGE;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.8f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_VERTEX_SMEAR: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_VERTEX_SMEAR;
        brush->gpencil_vertex_tool = GPVERTEX_TOOL_SMEAR;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.8f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_VERTEX_REPLACE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_VERTEX_REPLACE;
        brush->gpencil_vertex_tool = GPVERTEX_TOOL_REPLACE;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.8f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
  
        zero_v3(brush->secondary_rgb);
        break;
      }
      case GP_BRUSH_PRESET_SMOOTH_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_SMOOTH;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_SMOOTH;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.3f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_flag = GP_SCULPT_FLAG_SMOOTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_STRENGTH_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_STRENGTH;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_STRENGTH;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.3f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_flag = GP_SCULPT_FLAG_SMOOTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_THICKNESS_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_THICKNESS;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_THICKNESS;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.5f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_GRAB_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_GRAB;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_GRAB;
        brush->gpencil_settings->flag &= ~GP_BRUSH_USE_PRESSURE;
  
        brush->size = 25.0f;
  
        brush->gpencil_settings->draw_strength = 0.3f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_PUSH_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_PUSH;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_PUSH;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.3f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_TWIST_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_TWIST;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_TWIST;
  
        brush->size = 50.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.3f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_PINCH_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_PINCH;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_PINCH;
  
        brush->size = 50.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.5f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_RANDOMIZE_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_RANDOMIZE;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_RANDOMIZE;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.5f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_CLONE_STROKE: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_CLONE;
        brush->gpencil_sculpt_tool = GPSCULPT_TOOL_CLONE;
        brush->gpencil_settings->flag &= ~GP_BRUSH_USE_PRESSURE;
  
        brush->size = 25.0f;
  
        brush->gpencil_settings->draw_strength = 1.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      case GP_BRUSH_PRESET_DRAW_WEIGHT: {
        brush->gpencil_settings->icon_id = GP_BRUSH_ICON_GPBRUSH_WEIGHT;
        brush->gpencil_weight_tool = GPWEIGHT_TOOL_DRAW;
  
        brush->size = 25.0f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_PRESSURE;
  
        brush->gpencil_settings->draw_strength = 0.8f;
        brush->gpencil_settings->flag |= GP_BRUSH_USE_STENGTH_PRESSURE;
        brush->gpencil_settings->sculpt_mode_flag |= GP_SCULPT_FLAGMODE_APPLY_POSITION;
  
        break;
      }
      default:
        break;
    }
  }
  
  static Brush *gpencil_brush_ensure(
      Main *bmain, ToolSettings *ts, const char *brush_name, eObjectMode mode, bool *r_new)
  {
    *r_new = false;
    Brush *brush = BLI_findstring(&bmain->brushes, brush_name, offsetof(ID, name) + 2);
  
    /* If the brush exist, but the type is not GPencil or the mode is wrong, create a new one. */
    if ((brush != NULL) && ((brush->gpencil_settings == NULL) || (brush->ob_mode != mode))) {
      brush = NULL;
    }
  
    if (brush == NULL) {
      brush = BKE_brush_add_gpencil(bmain, ts, brush_name, mode);
      *r_new = true;
    }
  
    if (brush->gpencil_settings == NULL) {
      BKE_brush_init_gpencil_settings(brush);
    }
  
    return brush;
  }
  
  /* Create a set of grease pencil Drawing presets. */
  void BKE_brush_gpencil_paint_presets(Main *bmain, ToolSettings *ts, const bool reset)
  {
    bool r_new = false;
  
    Paint *paint = &ts->gp_paint->paint;
    Brush *brush_prev = paint->brush;
    Brush *brush, *deft_draw;
    /* Airbrush brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Airbrush", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_AIRBRUSH);
    }
  
    /* Ink Pen brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Ink Pen", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_INK_PEN);
    }
  
    /* Ink Pen Rough brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Ink Pen Rough", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_INK_PEN_ROUGH);
    }
  
    /* Marker Bold brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Marker Bold", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_MARKER_BOLD);
    }
  
    /* Marker Chisel brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Marker Chisel", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_MARKER_CHISEL);
    }
  
    /* Pen brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Pen", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_PEN);
    }
  
    /* Pencil Soft brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Pencil Soft", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_PENCIL_SOFT);
    }
  
    /* Pencil brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Pencil", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_PENCIL);
    }
    deft_draw = brush; /* save default brush. */
  
    /* Fill brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Fill Area", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_FILL_AREA);
    }
  
    /* Soft Eraser brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Eraser Soft", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_ERASER_SOFT);
    }
  
    /* Hard Eraser brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Eraser Hard", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_ERASER_HARD);
    }
  
    /* Point Eraser brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Eraser Point", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_ERASER_POINT);
    }
  
    /* Stroke Eraser brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Eraser Stroke", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_ERASER_STROKE);
    }
  
    /* Tint brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Tint", OB_MODE_PAINT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_TINT);
    }
  
    /* Set default Draw brush. */
    if (reset || brush_prev == NULL) {
      BKE_paint_brush_set(paint, deft_draw);
    }
    else {
      if (brush_prev != NULL) {
        BKE_paint_brush_set(paint, brush_prev);
      }
    }
  }
  
  /* Create a set of grease pencil Vertex Paint presets. */
  void BKE_brush_gpencil_vertex_presets(Main *bmain, ToolSettings *ts, const bool reset)
  {
    bool r_new = false;
  
    Paint *vertexpaint = &ts->gp_vertexpaint->paint;
    Brush *brush_prev = vertexpaint->brush;
    Brush *brush, *deft_vertex;
    /* Vertex Draw brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Vertex Draw", OB_MODE_VERTEX_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_VERTEX_DRAW);
    }
    deft_vertex = brush; /* save default brush. */
  
    /* Vertex Blur brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Vertex Blur", OB_MODE_VERTEX_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_VERTEX_BLUR);
    }
    /* Vertex Average brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Vertex Average", OB_MODE_VERTEX_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_VERTEX_AVERAGE);
    }
    /* Vertex Smear brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Vertex Smear", OB_MODE_VERTEX_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_VERTEX_SMEAR);
    }
    /* Vertex Replace brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Vertex Replace", OB_MODE_VERTEX_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_VERTEX_REPLACE);
    }
  
    /* Set default Vertex brush. */
    if (reset || brush_prev == NULL) {
      BKE_paint_brush_set(vertexpaint, deft_vertex);
    }
    else {
      if (brush_prev != NULL) {
        BKE_paint_brush_set(vertexpaint, brush_prev);
      }
    }
  }
  
  /* Create a set of grease pencil Sculpt Paint presets. */
  void BKE_brush_gpencil_sculpt_presets(Main *bmain, ToolSettings *ts, const bool reset)
  {
    bool r_new = false;
  
    Paint *sculptpaint = &ts->gp_sculptpaint->paint;
    Brush *brush_prev = sculptpaint->brush;
    Brush *brush, *deft_sculpt;
  
    /* Smooth brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Smooth Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_SMOOTH_STROKE);
    }
    deft_sculpt = brush;
  
    /* Strength brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Strength Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_STRENGTH_STROKE);
    }
  
    /* Thickness brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Thickness Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_THICKNESS_STROKE);
    }
  
    /* Grab brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Grab Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_GRAB_STROKE);
    }
  
    /* Push brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Push Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_PUSH_STROKE);
    }
  
    /* Twist brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Twist Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_TWIST_STROKE);
    }
  
    /* Pinch brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Pinch Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_PINCH_STROKE);
    }
  
    /* Randomize brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Randomize Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_RANDOMIZE_STROKE);
    }
  
    /* Clone brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Clone Stroke", OB_MODE_SCULPT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_CLONE_STROKE);
    }
  
    /* Set default brush. */
    if (reset || brush_prev == NULL) {
      BKE_paint_brush_set(sculptpaint, deft_sculpt);
    }
    else {
      if (brush_prev != NULL) {
        BKE_paint_brush_set(sculptpaint, brush_prev);
      }
    }
  }
  
  /* Create a set of grease pencil Weight Paint presets. */
  void BKE_brush_gpencil_weight_presets(Main *bmain, ToolSettings *ts, const bool reset)
  {
    bool r_new = false;
  
    Paint *weightpaint = &ts->gp_weightpaint->paint;
    Brush *brush_prev = weightpaint->brush;
    Brush *brush, *deft_weight;
    /* Vertex Draw brush. */
    brush = gpencil_brush_ensure(bmain, ts, "Draw Weight", OB_MODE_WEIGHT_GPENCIL, &r_new);
    if ((reset) || (r_new)) {
      BKE_gpencil_brush_preset_set(bmain, brush, GP_BRUSH_PRESET_DRAW_WEIGHT);
    }
    deft_weight = brush; /* save default brush. */
  
    /* Set default brush. */
    if (reset || brush_prev == NULL) {
      BKE_paint_brush_set(weightpaint, deft_weight);
    }
    else {
      if (brush_prev != NULL) {
        BKE_paint_brush_set(weightpaint, brush_prev);
      }
    }
  }
  
  struct Brush *BKE_brush_first_search(struct Main *bmain, const eObjectMode ob_mode)
  {
    Brush *brush;
  
    for (brush = bmain->brushes.first; brush; brush = brush->id.next) {
      if (brush->ob_mode & ob_mode) {
        return brush;
      }
    }
    return NULL;
  }
  
  Brush *BKE_brush_copy(Main *bmain, const Brush *brush)
  {
    Brush *brush_copy;
    BKE_id_copy(bmain, &brush->id, (ID **)&brush_copy);
    return brush_copy;
  }
  
  void BKE_brush_debug_print_state(Brush *br)
  {
    /* create a fake brush and set it to the defaults */
    Brush def = {{NULL}};
    brush_defaults(&def);
  
  #define BR_TEST(field, t) \
    if (br->field != def.field) \
    printf("br->" #field " = %" #t ";\n", br->field)
  
  #define BR_TEST_FLAG(_f) \
    if ((br->flag & _f) && !(def.flag & _f)) \
      printf("br->flag |= " #_f ";\n"); \
    else if (!(br->flag & _f) && (def.flag & _f)) \
    printf("br->flag &= ~" #_f ";\n")
  
  #define BR_TEST_FLAG_OVERLAY(_f) \
    if ((br->overlay_flags & _f) && !(def.overlay_flags & _f)) \
      printf("br->overlay_flags |= " #_f ";\n"); \
    else if (!(br->overlay_flags & _f) && (def.overlay_flags & _f)) \
    printf("br->overlay_flags &= ~" #_f ";\n")
  
    /* print out any non-default brush state */
    BR_TEST(normal_weight, f);
  
    BR_TEST(blend, d);
    BR_TEST(size, d);
  
    /* br->flag */
    BR_TEST_FLAG(BRUSH_AIRBRUSH);
    BR_TEST_FLAG(BRUSH_ALPHA_PRESSURE);
    BR_TEST_FLAG(BRUSH_SIZE_PRESSURE);
    BR_TEST_FLAG(BRUSH_JITTER_PRESSURE);
    BR_TEST_FLAG(BRUSH_SPACING_PRESSURE);
    BR_TEST_FLAG(BRUSH_ANCHORED);
    BR_TEST_FLAG(BRUSH_DIR_IN);
    BR_TEST_FLAG(BRUSH_SPACE);
    BR_TEST_FLAG(BRUSH_SMOOTH_STROKE);
    BR_TEST_FLAG(BRUSH_PERSISTENT);
    BR_TEST_FLAG(BRUSH_ACCUMULATE);
    BR_TEST_FLAG(BRUSH_LOCK_ALPHA);
    BR_TEST_FLAG(BRUSH_ORIGINAL_NORMAL);
    BR_TEST_FLAG(BRUSH_OFFSET_PRESSURE);
    BR_TEST_FLAG(BRUSH_SPACE_ATTEN);
    BR_TEST_FLAG(BRUSH_ADAPTIVE_SPACE);
    BR_TEST_FLAG(BRUSH_LOCK_SIZE);
    BR_TEST_FLAG(BRUSH_EDGE_TO_EDGE);
    BR_TEST_FLAG(BRUSH_DRAG_DOT);
    BR_TEST_FLAG(BRUSH_INVERSE_SMOOTH_PRESSURE);
    BR_TEST_FLAG(BRUSH_PLANE_TRIM);
    BR_TEST_FLAG(BRUSH_FRONTFACE);
    BR_TEST_FLAG(BRUSH_CUSTOM_ICON);
  
    BR_TEST_FLAG_OVERLAY(BRUSH_OVERLAY_CURSOR);
    BR_TEST_FLAG_OVERLAY(BRUSH_OVERLAY_PRIMARY);
    BR_TEST_FLAG_OVERLAY(BRUSH_OVERLAY_SECONDARY);
    BR_TEST_FLAG_OVERLAY(BRUSH_OVERLAY_CURSOR_OVERRIDE_ON_STROKE);
    BR_TEST_FLAG_OVERLAY(BRUSH_OVERLAY_PRIMARY_OVERRIDE_ON_STROKE);
    BR_TEST_FLAG_OVERLAY(BRUSH_OVERLAY_SECONDARY_OVERRIDE_ON_STROKE);
  
    BR_TEST(jitter, f);
    BR_TEST(spacing, d);
    BR_TEST(smooth_stroke_radius, d);
    BR_TEST(smooth_stroke_factor, f);
    BR_TEST(rate, f);
  
    BR_TEST(alpha, f);
  
    BR_TEST(sculpt_plane, d);
  
    BR_TEST(plane_offset, f);
  
    BR_TEST(autosmooth_factor, f);
  
    BR_TEST(topology_rake_factor, f);
  
    BR_TEST(crease_pinch_factor, f);
  
    BR_TEST(plane_trim, f);
  
    BR_TEST(texture_sample_bias, f);
    BR_TEST(texture_overlay_alpha, d);
  
    BR_TEST(add_col[0], f);
    BR_TEST(add_col[1], f);
    BR_TEST(add_col[2], f);
    BR_TEST(add_col[3], f);
    BR_TEST(sub_col[0], f);
    BR_TEST(sub_col[1], f);
    BR_TEST(sub_col[2], f);
    BR_TEST(sub_col[3], f);
  
    printf("\n");
  
  #undef BR_TEST
  #undef BR_TEST_FLAG
  }
  
  void BKE_brush_sculpt_reset(Brush *br)
  {
    /* enable this to see any non-default
     * settings used by a brush: */
    // BKE_brush_debug_print_state(br);
  
    brush_defaults(br);
    BKE_brush_curve_preset(br, CURVE_PRESET_SMOOTH);
  
    /* Use the curve presets by default */
    br->curve_preset = BRUSH_CURVE_SMOOTH;
  
    /* Note that sculpt defaults where set when 0.5 was the default (now it's 1.0)
     * assign this so logic below can remain the same. */
    br->alpha = 0.5f;
  
    /* Brush settings */
    switch (br->sculpt_tool) {
      case SCULPT_TOOL_DRAW_SHARP:
        br->flag |= BRUSH_DIR_IN;
        br->curve_preset = BRUSH_CURVE_POW4;
        br->spacing = 5;
        break;
      case SCULPT_TOOL_SLIDE_RELAX:
        br->spacing = 10;
        br->alpha = 1.0f;
        br->slide_deform_type = BRUSH_SLIDE_DEFORM_DRAG;
        break;
      case SCULPT_TOOL_CLAY:
        br->flag |= BRUSH_SIZE_PRESSURE;
        br->spacing = 3;
        br->autosmooth_factor = 0.25f;
        br->normal_radius_factor = 0.75f;
        br->hardness = 0.65f;
        break;
      case SCULPT_TOOL_CLAY_THUMB:
        br->alpha = 0.5f;
        br->normal_radius_factor = 1.0f;
        br->spacing = 6;
        br->hardness = 0.5f;
        br->flag |= BRUSH_SIZE_PRESSURE;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        break;
      case SCULPT_TOOL_CLAY_STRIPS:
        br->flag |= BRUSH_ACCUMULATE | BRUSH_SIZE_PRESSURE;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        br->alpha = 0.6f;
        br->spacing = 5;
        br->normal_radius_factor = 1.55f;
        br->tip_roundness = 0.18f;
        br->curve_preset = BRUSH_CURVE_SMOOTHER;
        break;
      case SCULPT_TOOL_MULTIPLANE_SCRAPE:
        br->flag2 |= BRUSH_MULTIPLANE_SCRAPE_DYNAMIC | BRUSH_MULTIPLANE_SCRAPE_PLANES_PREVIEW;
        br->alpha = 0.7f;
        br->normal_radius_factor = 0.70f;
        br->multiplane_scrape_angle = 60;
        br->curve_preset = BRUSH_CURVE_SMOOTH;
        br->spacing = 5;
        break;
      case SCULPT_TOOL_CREASE:
        br->flag |= BRUSH_DIR_IN;
        br->alpha = 0.25;
        break;
      case SCULPT_TOOL_SCRAPE:
      case SCULPT_TOOL_FILL:
        br->alpha = 1.0f;
        br->spacing = 7;
        br->flag |= BRUSH_ACCUMULATE;
        br->flag |= BRUSH_INVERT_TO_SCRAPE_FILL;
        break;
      case SCULPT_TOOL_ROTATE:
        br->alpha = 1.0;
        break;
      case SCULPT_TOOL_SMOOTH:
        br->flag &= ~BRUSH_SPACE_ATTEN;
        br->automasking_flags |= BRUSH_AUTOMASKING_BOUNDARY_EDGES;
        br->spacing = 5;
        br->alpha = 0.7f;
        br->surface_smooth_shape_preservation = 0.5f;
        br->surface_smooth_current_vertex = 0.5f;
        br->surface_smooth_iterations = 4;
        break;
      case SCULPT_TOOL_SNAKE_HOOK:
        br->alpha = 1.0f;
        br->rake_factor = 1.0f;
        break;
      case SCULPT_TOOL_THUMB:
        br->size = 75;
        br->flag &= ~BRUSH_ALPHA_PRESSURE;
        br->flag &= ~BRUSH_SPACE;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        break;
      case SCULPT_TOOL_ELASTIC_DEFORM:
        br->elastic_deform_volume_preservation = 0.4f;
        br->elastic_deform_type = BRUSH_ELASTIC_DEFORM_GRAB_TRISCALE;
        br->flag &= ~BRUSH_ALPHA_PRESSURE;
        br->flag &= ~BRUSH_SPACE;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        break;
      case SCULPT_TOOL_POSE:
        br->pose_smooth_iterations = 4;
        br->pose_ik_segments = 1;
        br->flag2 |= BRUSH_POSE_IK_ANCHORED | BRUSH_USE_CONNECTED_ONLY;
        br->flag &= ~BRUSH_ALPHA_PRESSURE;
        br->flag &= ~BRUSH_SPACE;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        break;
      case SCULPT_TOOL_DRAW_FACE_SETS:
        br->alpha = 0.5f;
        br->flag &= ~BRUSH_ALPHA_PRESSURE;
        br->flag &= ~BRUSH_SPACE;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        break;
      case SCULPT_TOOL_GRAB:
        br->alpha = 0.4f;
        br->size = 75;
        br->flag &= ~BRUSH_ALPHA_PRESSURE;
        br->flag &= ~BRUSH_SPACE;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        break;
      case SCULPT_TOOL_CLOTH:
        br->cloth_mass = 1.0f;
        br->cloth_damping = 0.01f;
        br->cloth_sim_limit = 2.5f;
        br->cloth_sim_falloff = 0.75f;
        br->cloth_deform_type = BRUSH_CLOTH_DEFORM_DRAG;
        br->flag &= ~(BRUSH_ALPHA_PRESSURE | BRUSH_SIZE_PRESSURE);
        break;
      case SCULPT_TOOL_LAYER:
        br->flag &= ~BRUSH_SPACE_ATTEN;
        br->hardness = 0.35f;
        br->alpha = 1.0f;
        br->height = 0.05f;
        break;
      case SCULPT_TOOL_PAINT:
        br->hardness = 0.4f;
        br->spacing = 10;
        br->alpha = 0.6f;
        br->flow = 1.0f;
        br->tip_scale_x = 1.0f;
        br->tip_roundness = 1.0f;
        br->density = 1.0f;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        zero_v3(br->rgb);
        break;
      case SCULPT_TOOL_SMEAR:
        br->alpha = 1.0f;
        br->spacing = 5;
        br->flag &= ~BRUSH_ALPHA_PRESSURE;
        br->flag &= ~BRUSH_SPACE_ATTEN;
        br->curve_preset = BRUSH_CURVE_SPHERE;
        break;
      default:
        break;
    }
  
    /* Cursor colors */
  
    /* Default Alpha */
    br->add_col[3] = 0.90f;
    br->sub_col[3] = 0.90f;
  
    switch (br->sculpt_tool) {
      case SCULPT_TOOL_DRAW:
      case SCULPT_TOOL_DRAW_SHARP:
      case SCULPT_TOOL_CLAY:
      case SCULPT_TOOL_CLAY_STRIPS:
      case SCULPT_TOOL_CLAY_THUMB:
      case SCULPT_TOOL_LAYER:
      case SCULPT_TOOL_INFLATE:
      case SCULPT_TOOL_BLOB:
      case SCULPT_TOOL_CREASE:
        br->add_col[0] = 0.0f;
        br->add_col[1] = 0.5f;
        br->add_col[2] = 1.0f;
        br->sub_col[0] = 0.0f;
        br->sub_col[1] = 0.5f;
        br->sub_col[2] = 1.0f;
        break;
  
      case SCULPT_TOOL_SMOOTH:
      case SCULPT_TOOL_FLATTEN:
      case SCULPT_TOOL_FILL:
      case SCULPT_TOOL_SCRAPE:
      case SCULPT_TOOL_MULTIPLANE_SCRAPE:
        br->add_col[0] = 0.877f;
        br->add_col[1] = 0.142f;
        br->add_col[2] = 0.117f;
        br->sub_col[0] = 0.877f;
        br->sub_col[1] = 0.142f;
        br->sub_col[2] = 0.117f;
        break;
  
      case SCULPT_TOOL_PINCH:
      case SCULPT_TOOL_GRAB:
      case SCULPT_TOOL_SNAKE_HOOK:
      case SCULPT_TOOL_THUMB:
      case SCULPT_TOOL_NUDGE:
      case SCULPT_TOOL_ROTATE:
      case SCULPT_TOOL_ELASTIC_DEFORM:
      case SCULPT_TOOL_POSE:
      case SCULPT_TOOL_SLIDE_RELAX:
        br->add_col[0] = 1.0f;
        br->add_col[1] = 0.95f;
        br->add_col[2] = 0.005f;
        br->sub_col[0] = 1.0f;
        br->sub_col[1] = 0.95f;
        br->sub_col[2] = 0.005f;
        break;
  
      case SCULPT_TOOL_SIMPLIFY:
      case SCULPT_TOOL_PAINT:
      case SCULPT_TOOL_MASK:
      case SCULPT_TOOL_DRAW_FACE_SETS:
        br->add_col[0] = 0.75f;
        br->add_col[1] = 0.75f;
        br->add_col[2] = 0.75f;
        br->sub_col[0] = 0.75f;
        br->sub_col[1] = 0.75f;
        br->sub_col[2] = 0.75f;
        break;
  
      case SCULPT_TOOL_CLOTH:
        br->add_col[0] = 1.0f;
        br->add_col[1] = 0.5f;
        br->add_col[2] = 0.1f;
        br->sub_col[0] = 1.0f;
        br->sub_col[1] = 0.5f;
        br->sub_col[2] = 0.1f;
        break;
      default:
        break;
    }
  }
  
  /**
   * Library Operations
   */
  void BKE_brush_curve_preset(Brush *b, eCurveMappingPreset preset)
  {
    CurveMapping *cumap = NULL;
    CurveMap *cuma = NULL;
  
    if (!b->curve) {
      b->curve = BKE_curvemapping_add(1, 0, 0, 1, 1);
    }
    cumap = b->curve;
    cumap->flag &= ~CUMA_EXTEND_EXTRAPOLATE;
    cumap->preset = preset;
  
    cuma = b->curve->cm;
    BKE_curvemap_reset(cuma, &cumap->clipr, cumap->preset, CURVEMAP_SLOPE_NEGATIVE);
    BKE_curvemapping_changed(cumap, false);
  }
  
  /* Generic texture sampler for 3D painting systems. point has to be either in
   * region space mouse coordinates, or 3d world coordinates for 3D mapping.
   *
   * rgba outputs straight alpha. */
  float BKE_brush_sample_tex_3d(const Scene *scene,
                                const Brush *br,
                                const float point[3],
                                float rgba[4],
                                const int thread,
                                struct ImagePool *pool)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
    const MTex *mtex = &br->mtex;
    float intensity = 1.0;
    bool hasrgb = false;
  
    if (!mtex->tex) {
      intensity = 1;
    }
    else if (mtex->brush_map_mode == MTEX_MAP_MODE_3D) {
      /* Get strength by feeding the vertex
       * location directly into a texture */
      hasrgb = RE_texture_evaluate(mtex, point, thread, pool, false, false, &intensity, rgba);
    }
    else if (mtex->brush_map_mode == MTEX_MAP_MODE_STENCIL) {
      float rotation = -mtex->rot;
      float point_2d[2] = {point[0], point[1]};
      float x, y;
      float co[3];
  
      x = point_2d[0] - br->stencil_pos[0];
      y = point_2d[1] - br->stencil_pos[1];
  
      if (rotation > 0.001f || rotation < -0.001f) {
        const float angle = atan2f(y, x) + rotation;
        const float flen = sqrtf(x * x + y * y);
  
        x = flen * cosf(angle);
        y = flen * sinf(angle);
      }
  
      if (fabsf(x) > br->stencil_dimension[0] || fabsf(y) > br->stencil_dimension[1]) {
        zero_v4(rgba);
        return 0.0f;
      }
      x /= (br->stencil_dimension[0]);
      y /= (br->stencil_dimension[1]);
  
      co[0] = x;
      co[1] = y;
      co[2] = 0.0f;
  
      hasrgb = RE_texture_evaluate(mtex, co, thread, pool, false, false, &intensity, rgba);
    }
    else {
      float rotation = -mtex->rot;
      float point_2d[2] = {point[0], point[1]};
      float x = 0.0f, y = 0.0f; /* Quite warnings */
      float invradius = 1.0f;   /* Quite warnings */
      float co[3];
  
      if (mtex->brush_map_mode == MTEX_MAP_MODE_VIEW) {
        /* keep coordinates relative to mouse */
  
        rotation += ups->brush_rotation;
  
        x = point_2d[0] - ups->tex_mouse[0];
        y = point_2d[1] - ups->tex_mouse[1];
  
        /* use pressure adjusted size for fixed mode */
        invradius = 1.0f / ups->pixel_radius;
      }
      else if (mtex->brush_map_mode == MTEX_MAP_MODE_TILED) {
        /* leave the coordinates relative to the screen */
  
        /* use unadjusted size for tiled mode */
        invradius = 1.0f / BKE_brush_size_get(scene, br);
  
        x = point_2d[0];
        y = point_2d[1];
      }
      else if (mtex->brush_map_mode == MTEX_MAP_MODE_RANDOM) {
        rotation += ups->brush_rotation;
        /* these contain a random coordinate */
        x = point_2d[0] - ups->tex_mouse[0];
        y = point_2d[1] - ups->tex_mouse[1];
  
        invradius = 1.0f / ups->pixel_radius;
      }
  
      x *= invradius;
      y *= invradius;
  
      /* it is probably worth optimizing for those cases where
       * the texture is not rotated by skipping the calls to
       * atan2, sqrtf, sin, and cos. */
      if (rotation > 0.001f || rotation < -0.001f) {
        const float angle = atan2f(y, x) + rotation;
        const float flen = sqrtf(x * x + y * y);
  
        x = flen * cosf(angle);
        y = flen * sinf(angle);
      }
  
      co[0] = x;
      co[1] = y;
      co[2] = 0.0f;
  
      hasrgb = RE_texture_evaluate(mtex, co, thread, pool, false, false, &intensity, rgba);
    }
  
    intensity += br->texture_sample_bias;
  
    if (!hasrgb) {
      rgba[0] = intensity;
      rgba[1] = intensity;
      rgba[2] = intensity;
      rgba[3] = 1.0f;
    }
    /* For consistency, sampling always returns color in linear space */
    else if (ups->do_linear_conversion) {
      IMB_colormanagement_colorspace_to_scene_linear_v3(rgba, ups->colorspace);
    }
  
    return intensity;
  }
  
  float BKE_brush_sample_masktex(
      const Scene *scene, Brush *br, const float point[2], const int thread, struct ImagePool *pool)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
    MTex *mtex = &br->mask_mtex;
    float rgba[4], intensity;
  
    if (!mtex->tex) {
      return 1.0f;
    }
    if (mtex->brush_map_mode == MTEX_MAP_MODE_STENCIL) {
      float rotation = -mtex->rot;
      float point_2d[2] = {point[0], point[1]};
      float x, y;
      float co[3];
  
      x = point_2d[0] - br->mask_stencil_pos[0];
      y = point_2d[1] - br->mask_stencil_pos[1];
  
      if (rotation > 0.001f || rotation < -0.001f) {
        const float angle = atan2f(y, x) + rotation;
        const float flen = sqrtf(x * x + y * y);
  
        x = flen * cosf(angle);
        y = flen * sinf(angle);
      }
  
      if (fabsf(x) > br->mask_stencil_dimension[0] || fabsf(y) > br->mask_stencil_dimension[1]) {
        zero_v4(rgba);
        return 0.0f;
      }
      x /= (br->mask_stencil_dimension[0]);
      y /= (br->mask_stencil_dimension[1]);
  
      co[0] = x;
      co[1] = y;
      co[2] = 0.0f;
  
      RE_texture_evaluate(mtex, co, thread, pool, false, false, &intensity, rgba);
    }
    else {
      float rotation = -mtex->rot;
      float point_2d[2] = {point[0], point[1]};
      float x = 0.0f, y = 0.0f; /* Quite warnings */
      float invradius = 1.0f;   /* Quite warnings */
      float co[3];
  
      if (mtex->brush_map_mode == MTEX_MAP_MODE_VIEW) {
        /* keep coordinates relative to mouse */
  
        rotation += ups->brush_rotation_sec;
  
        x = point_2d[0] - ups->mask_tex_mouse[0];
        y = point_2d[1] - ups->mask_tex_mouse[1];
  
        /* use pressure adjusted size for fixed mode */
        invradius = 1.0f / ups->pixel_radius;
      }
      else if (mtex->brush_map_mode == MTEX_MAP_MODE_TILED) {
        /* leave the coordinates relative to the screen */
  
        /* use unadjusted size for tiled mode */
        invradius = 1.0f / BKE_brush_size_get(scene, br);
  
        x = point_2d[0];
        y = point_2d[1];
      }
      else if (mtex->brush_map_mode == MTEX_MAP_MODE_RANDOM) {
        rotation += ups->brush_rotation_sec;
        /* these contain a random coordinate */
        x = point_2d[0] - ups->mask_tex_mouse[0];
        y = point_2d[1] - ups->mask_tex_mouse[1];
  
        invradius = 1.0f / ups->pixel_radius;
      }
  
      x *= invradius;
      y *= invradius;
  
      /* it is probably worth optimizing for those cases where
       * the texture is not rotated by skipping the calls to
       * atan2, sqrtf, sin, and cos. */
      if (rotation > 0.001f || rotation < -0.001f) {
        const float angle = atan2f(y, x) + rotation;
        const float flen = sqrtf(x * x + y * y);
  
        x = flen * cosf(angle);
        y = flen * sinf(angle);
      }
  
      co[0] = x;
      co[1] = y;
      co[2] = 0.0f;
  
      RE_texture_evaluate(mtex, co, thread, pool, false, false, &intensity, rgba);
    }
  
    CLAMP(intensity, 0.0f, 1.0f);
  
    switch (br->mask_pressure) {
      case BRUSH_MASK_PRESSURE_CUTOFF:
        intensity = ((1.0f - intensity) < ups->size_pressure_value) ? 1.0f : 0.0f;
        break;
      case BRUSH_MASK_PRESSURE_RAMP:
        intensity = ups->size_pressure_value + intensity * (1.0f - ups->size_pressure_value);
        break;
      default:
        break;
    }
  
    return intensity;
  }
  
  /* Unified Size / Strength / Color */
  
  /* XXX: be careful about setting size and unprojected radius
   * because they depend on one another
   * these functions do not set the other corresponding value
   * this can lead to odd behavior if size and unprojected
   * radius become inconsistent.
   * the biggest problem is that it isn't possible to change
   * unprojected radius because a view context is not
   * available.  my usual solution to this is to use the
   * ratio of change of the size to change the unprojected
   * radius.  Not completely convinced that is correct.
   * In any case, a better solution is needed to prevent
   * inconsistency. */
  
  const float *BKE_brush_color_get(const struct Scene *scene, const struct Brush *brush)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
    return (ups->flag & UNIFIED_PAINT_COLOR) ? ups->rgb : brush->rgb;
  }
  
  const float *BKE_brush_secondary_color_get(const struct Scene *scene, const struct Brush *brush)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
    return (ups->flag & UNIFIED_PAINT_COLOR) ? ups->secondary_rgb : brush->secondary_rgb;
  }
  
  void BKE_brush_color_set(struct Scene *scene, struct Brush *brush, const float color[3])
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
  
    if (ups->flag & UNIFIED_PAINT_COLOR) {
      copy_v3_v3(ups->rgb, color);
    }
    else {
      copy_v3_v3(brush->rgb, color);
    }
  }
  
  void BKE_brush_size_set(Scene *scene, Brush *brush, int size)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
  
    /* make sure range is sane */
    CLAMP(size, 1, MAX_BRUSH_PIXEL_RADIUS);
  
    if (ups->flag & UNIFIED_PAINT_SIZE) {
      ups->size = size;
    }
    else {
      brush->size = size;
    }
  }
  
  int BKE_brush_size_get(const Scene *scene, const Brush *brush)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
    int size = (ups->flag & UNIFIED_PAINT_SIZE) ? ups->size : brush->size;
  
    return size;
  }
  
  bool BKE_brush_use_locked_size(const Scene *scene, const Brush *brush)
  {
    const short us_flag = scene->toolsettings->unified_paint_settings.flag;
  
    return (us_flag & UNIFIED_PAINT_SIZE) ? (us_flag & UNIFIED_PAINT_BRUSH_LOCK_SIZE) :
                                            (brush->flag & BRUSH_LOCK_SIZE);
  }
  
  bool BKE_brush_use_size_pressure(const Brush *brush)
  {
    return brush->flag & BRUSH_SIZE_PRESSURE;
  }
  
  bool BKE_brush_use_alpha_pressure(const Brush *brush)
  {
    return brush->flag & BRUSH_ALPHA_PRESSURE;
  }
  
  bool BKE_brush_sculpt_has_secondary_color(const Brush *brush)
  {
    return ELEM(brush->sculpt_tool,
                SCULPT_TOOL_BLOB,
                SCULPT_TOOL_DRAW,
                SCULPT_TOOL_DRAW_SHARP,
                SCULPT_TOOL_INFLATE,
                SCULPT_TOOL_CLAY,
                SCULPT_TOOL_CLAY_STRIPS,
                SCULPT_TOOL_CLAY_THUMB,
                SCULPT_TOOL_PINCH,
                SCULPT_TOOL_CREASE,
                SCULPT_TOOL_LAYER,
                SCULPT_TOOL_FLATTEN,
                SCULPT_TOOL_FILL,
                SCULPT_TOOL_SCRAPE,
                SCULPT_TOOL_MASK);
  }
  
  void BKE_brush_unprojected_radius_set(Scene *scene, Brush *brush, float unprojected_radius)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
  
    if (ups->flag & UNIFIED_PAINT_SIZE) {
      ups->unprojected_radius = unprojected_radius;
    }
    else {
      brush->unprojected_radius = unprojected_radius;
    }
  }
  
  float BKE_brush_unprojected_radius_get(const Scene *scene, const Brush *brush)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
  
    return (ups->flag & UNIFIED_PAINT_SIZE) ? ups->unprojected_radius : brush->unprojected_radius;
  }
  
  void BKE_brush_alpha_set(Scene *scene, Brush *brush, float alpha)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
  
    if (ups->flag & UNIFIED_PAINT_ALPHA) {
      ups->alpha = alpha;
    }
    else {
      brush->alpha = alpha;
    }
  }
  
  float BKE_brush_alpha_get(const Scene *scene, const Brush *brush)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
  
    return (ups->flag & UNIFIED_PAINT_ALPHA) ? ups->alpha : brush->alpha;
  }
  
  float BKE_brush_weight_get(const Scene *scene, const Brush *brush)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
  
    return (ups->flag & UNIFIED_PAINT_WEIGHT) ? ups->weight : brush->weight;
  }
  
  void BKE_brush_weight_set(const Scene *scene, Brush *brush, float value)
  {
    UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
  
    if (ups->flag & UNIFIED_PAINT_WEIGHT) {
      ups->weight = value;
    }
    else {
      brush->weight = value;
    }
  }
  
  /* scale unprojected radius to reflect a change in the brush's 2D size */
  void BKE_brush_scale_unprojected_radius(float *unprojected_radius,
                                          int new_brush_size,
                                          int old_brush_size)
  {
    float scale = new_brush_size;
    /* avoid division by zero */
    if (old_brush_size != 0) {
      scale /= (float)old_brush_size;
    }
    (*unprojected_radius) *= scale;
  }
  
  /* scale brush size to reflect a change in the brush's unprojected radius */
  void BKE_brush_scale_size(int *r_brush_size,
                            float new_unprojected_radius,
                            float old_unprojected_radius)
  {
    float scale = new_unprojected_radius;
    /* avoid division by zero */
    if (old_unprojected_radius != 0) {
      scale /= new_unprojected_radius;
    }
    (*r_brush_size) = (int)((float)(*r_brush_size) * scale);
  }
  
  void BKE_brush_jitter_pos(const Scene *scene, Brush *brush, const float pos[2], float jitterpos[2])
  {
    float rand_pos[2];
    float spread;
    int diameter;
  
    do {
      rand_pos[0] = BLI_rng_get_float(brush_rng) - 0.5f;
      rand_pos[1] = BLI_rng_get_float(brush_rng) - 0.5f;
    } while (len_squared_v2(rand_pos) > square_f(0.5f));
  
    if (brush->flag & BRUSH_ABSOLUTE_JITTER) {
      diameter = 2 * brush->jitter_absolute;
      spread = 1.0;
    }
    else {
      diameter = 2 * BKE_brush_size_get(scene, brush);
      spread = brush->jitter;
    }
    /* find random position within a circle of diameter 1 */
    jitterpos[0] = pos[0] + 2 * rand_pos[0] * diameter * spread;
    jitterpos[1] = pos[1] + 2 * rand_pos[1] * diameter * spread;
  }
  
  void BKE_brush_randomize_texture_coords(UnifiedPaintSettings *ups, bool mask)
  {
    /* we multiply with brush radius as an optimization for the brush
     * texture sampling functions */
    if (mask) {
      ups->mask_tex_mouse[0] = BLI_rng_get_float(brush_rng) * ups->pixel_radius;
      ups->mask_tex_mouse[1] = BLI_rng_get_float(brush_rng) * ups->pixel_radius;
    }
    else {
      ups->tex_mouse[0] = BLI_rng_get_float(brush_rng) * ups->pixel_radius;
      ups->tex_mouse[1] = BLI_rng_get_float(brush_rng) * ups->pixel_radius;
    }
  }
  
  /* Uses the brush curve control to find a strength value */
  float BKE_brush_curve_strength(const Brush *br, float p, const float len)
  {
    float strength = 1.0f;
  
    if (p >= len) {
      return 0;
    }
  
    p = p / len;
    p = 1.0f - p;
  
    switch (br->curve_preset) {
      case BRUSH_CURVE_CUSTOM:
        strength = BKE_curvemapping_evaluateF(br->curve, 0, 1.0f - p);
        break;
      case BRUSH_CURVE_SHARP:
        strength = p * p;
        break;
      case BRUSH_CURVE_SMOOTH:
        strength = 3.0f * p * p - 2.0f * p * p * p;
        break;
      case BRUSH_CURVE_SMOOTHER:
        strength = pow3f(p) * (p * (p * 6.0f - 15.0f) + 10.0f);
        break;
      case BRUSH_CURVE_ROOT:
        strength = sqrtf(p);
        break;
      case BRUSH_CURVE_LIN:
        strength = p;
        break;
      case BRUSH_CURVE_CONSTANT:
        strength = 1.0f;
        break;
      case BRUSH_CURVE_SPHERE:
        strength = sqrtf(2 * p - p * p);
        break;
      case BRUSH_CURVE_POW4:
        strength = p * p * p * p;
        break;
      case BRUSH_CURVE_INVSQUARE:
        strength = p * (2.0f - p);
        break;
    }
  
    return strength;
  }
  
  /* Uses the brush curve control to find a strength value between 0 and 1 */
  float BKE_brush_curve_strength_clamped(Brush *br, float p, const float len)
  {
    float strength = BKE_brush_curve_strength(br, p, len);
  
    CLAMP(strength, 0.0f, 1.0f);
  
    return strength;
  }
  
  /* TODO: should probably be unified with BrushPainter stuff? */
  unsigned int *BKE_brush_gen_texture_cache(Brush *br, int half_side, bool use_secondary)
  {
    unsigned int *texcache = NULL;
    MTex *mtex = (use_secondary) ? &br->mask_mtex : &br->mtex;
    float intensity;
    float rgba_dummy[4];
    int ix, iy;
    int side = half_side * 2;
  
    if (mtex->tex) {
      float x, y, step = 2.0 / side, co[3];
  
      texcache = MEM_callocN(sizeof(int) * side * side, "Brush texture cache");
  
      /* do normalized canonical view coords for texture */
      for (y = -1.0, iy = 0; iy < side; iy++, y += step) {
        for (x = -1.0, ix = 0; ix < side; ix++, x += step) {
          co[0] = x;
          co[1] = y;
          co[2] = 0.0f;
  
          /* This is copied from displace modifier code */
          /* TODO(sergey): brush are always caching with CM enabled for now. */
          RE_texture_evaluate(mtex, co, 0, NULL, false, false, &intensity, rgba_dummy);
          copy_v4_uchar((uchar *)&texcache[iy * side + ix], (char)(intensity * 255.0f));
        }
      }
    }
  
    return texcache;
  }
  
  /**** Radial Control ****/
  struct ImBuf *BKE_brush_gen_radial_control_imbuf(Brush *br, bool secondary, bool display_gradient)
  {
    ImBuf *im = MEM_callocN(sizeof(ImBuf), "radial control texture");
    unsigned int *texcache;
    int side = 512;
    int half = side / 2;
    int i, j;
  
    BKE_curvemapping_initialize(br->curve);
    texcache = BKE_brush_gen_texture_cache(br, half, secondary);
    im->rect_float = MEM_callocN(sizeof(float) * side * side, "radial control rect");
    im->x = im->y = side;
  
    if (display_gradient || texcache) {
      for (i = 0; i < side; i++) {
        for (j = 0; j < side; j++) {
          float magn = sqrtf(pow2f(i - half) + pow2f(j - half));
          im->rect_float[i * side + j] = BKE_brush_curve_strength_clamped(br, magn, half);
        }
      }
    }
  
    if (texcache) {
      /* Modulate curve with texture */
      for (i = 0; i < side; i++) {
        for (j = 0; j < side; j++) {
          const int col = texcache[i * side + j];
          im->rect_float[i * side + j] *= (((char *)&col)[0] + ((char *)&col)[1] +
                                           ((char *)&col)[2]) /
                                          3.0f / 255.0f;
        }
      }
      MEM_freeN(texcache);
    }
  
    return im;
  }
  