blender-archive/source/blender/gpencil_modifiers/intern/MOD_gpenciltint.c

/*
 * 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.
 *
 * The Original Code is Copyright (C) 2017, Blender Foundation
 * This is a new part of Blender
 */

/** \file
 * \ingroup modifiers
 */

#include <stdio.h>

#include "BLI_utildefines.h"

#include "BLI_blenlib.h"
#include "BLI_ghash.h"
#include "BLI_math_vector.h"

#include "DNA_scene_types.h"
#include "DNA_object_types.h"
#include "DNA_gpencil_types.h"
#include "DNA_gpencil_modifier_types.h"

#include "BKE_gpencil.h"
#include "BKE_gpencil_modifier.h"
#include "BKE_material.h"
#include "BKE_main.h"

#include "DEG_depsgraph.h"

#include "MOD_gpencil_util.h"
#include "MOD_gpencil_modifiertypes.h"

static void initData(GpencilModifierData *md)
{
  TintGpencilModifierData *gpmd = (TintGpencilModifierData *)md;
  gpmd->pass_index = 0;
  gpmd->factor = 0.5f;
  gpmd->layername[0] = '\0';
  ARRAY_SET_ITEMS(gpmd->rgb, 1.0f, 1.0f, 1.0f);
  gpmd->flag |= GP_TINT_CREATE_COLORS;
  gpmd->modify_color = GP_MODIFY_COLOR_BOTH;
}

static void copyData(const GpencilModifierData *md, GpencilModifierData *target)
{
  BKE_gpencil_modifier_copyData_generic(md, target);
}

/* tint strokes */
static void deformStroke(GpencilModifierData *md,
                         Depsgraph *UNUSED(depsgraph),
                         Object *ob,
                         bGPDlayer *gpl,
                         bGPDframe *UNUSED(gpf),
                         bGPDstroke *gps)
{
  TintGpencilModifierData *mmd = (TintGpencilModifierData *)md;

  if (!is_stroke_affected_by_modifier(ob,
                                      mmd->layername,
                                      mmd->pass_index,
                                      mmd->layer_pass,
                                      1,
                                      gpl,
                                      gps,
                                      mmd->flag & GP_TINT_INVERT_LAYER,
                                      mmd->flag & GP_TINT_INVERT_PASS,
                                      mmd->flag & GP_TINT_INVERT_LAYERPASS)) {
    return;
  }

  if (mmd->modify_color != GP_MODIFY_COLOR_FILL) {
    interp_v3_v3v3(
        gps->runtime.tmp_stroke_rgba, gps->runtime.tmp_stroke_rgba, mmd->rgb, mmd->factor);
    /* if factor is > 1, the alpha must be changed to get full tint */
    if (mmd->factor > 1.0f) {
      gps->runtime.tmp_stroke_rgba[3] += mmd->factor - 1.0f;
    }
    CLAMP4(gps->runtime.tmp_stroke_rgba, 0.0f, 1.0f);
  }

  if (mmd->modify_color != GP_MODIFY_COLOR_STROKE) {
    interp_v3_v3v3(gps->runtime.tmp_fill_rgba, gps->runtime.tmp_fill_rgba, mmd->rgb, mmd->factor);
    /* if factor is > 1, the alpha must be changed to get full tint */
    if (mmd->factor > 1.0f && gps->runtime.tmp_fill_rgba[3] > 1e-5) {
      gps->runtime.tmp_fill_rgba[3] += mmd->factor - 1.0f;
    }
    CLAMP4(gps->runtime.tmp_fill_rgba, 0.0f, 1.0f);
  }

  /* if factor > 1.0, affect the strength of the stroke */
  if (mmd->factor > 1.0f) {
    for (int i = 0; i < gps->totpoints; i++) {
      bGPDspoint *pt = &gps->points[i];
      pt->strength += mmd->factor - 1.0f;
      CLAMP(pt->strength, 0.0f, 1.0f);
    }
  }
}

static void bakeModifier(Main *bmain, Depsgraph *depsgraph, GpencilModifierData *md, Object *ob)
{
  TintGpencilModifierData *mmd = (TintGpencilModifierData *)md;
  bGPdata *gpd = ob->data;

  GHash *gh_color = BLI_ghash_str_new("GP_Tint modifier");
  for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
    for (bGPDframe *gpf = gpl->frames.first; gpf; gpf = gpf->next) {
      for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {

        Material *mat = give_current_material(ob, gps->mat_nr + 1);
        if (mat == NULL) {
          continue;
        }
        MaterialGPencilStyle *gp_style = mat->gp_style;
        /* skip stroke if it doesn't have color info */
        if (ELEM(NULL, gp_style)) {
          continue;
        }

        copy_v4_v4(gps->runtime.tmp_stroke_rgba, gp_style->stroke_rgba);
        copy_v4_v4(gps->runtime.tmp_fill_rgba, gp_style->fill_rgba);

        deformStroke(md, depsgraph, ob, gpl, gpf, gps);

        gpencil_apply_modifier_material(
            bmain, ob, mat, gh_color, gps, (bool)(mmd->flag & GP_TINT_CREATE_COLORS));
      }
    }
  }
  /* free hash buffers */
  if (gh_color) {
    BLI_ghash_free(gh_color, NULL, NULL);
    gh_color = NULL;
  }
}

GpencilModifierTypeInfo modifierType_Gpencil_Tint = {
    /* name */ "Tint",
    /* structName */ "TintGpencilModifierData",
    /* structSize */ sizeof(TintGpencilModifierData),
    /* type */ eGpencilModifierTypeType_Gpencil,
    /* flags */ eGpencilModifierTypeFlag_SupportsEditmode,

    /* copyData */ copyData,

    /* deformStroke */ deformStroke,
    /* generateStrokes */ NULL,
    /* bakeModifier */ bakeModifier,
    /* remapTime */ NULL,

    /* initData */ initData,
    /* freeData */ NULL,
    /* isDisabled */ NULL,
    /* updateDepsgraph */ NULL,
    /* dependsOnTime */ NULL,
    /* foreachObjectLink */ NULL,
    /* foreachIDLink */ NULL,
    /* foreachTexLink */ NULL,
    /* getDuplicationFactor */ NULL,
};