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/*
* 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) 2001-2002 by NaN Holding BV.
* All rights reserved.
*/
/** \file
* \ingroup ed
*/
#include "BLI_math.h"
#include "MEM_guardedalloc.h"
#include "DNA_brush_types.h"
#include "BKE_brush.h"
#include "paint_intern.h"
namespace blender::ed::sculpt_paint {
static int aa_samples_per_texel_axis(const Brush *brush, const float radius)
{
int aa_samples = 1.0f / (radius * 0.20f);
if (brush->sampling_flag & BRUSH_PAINT_ANTIALIASING) {
aa_samples = clamp_i(aa_samples, 3, 16);
}
else {
aa_samples = 1;
}
return aa_samples;
}
/* create a mask with the falloff strength */
static void update_curve_mask(CurveMaskCache *curve_mask_cache,
const Brush *brush,
const int diameter,
const float radius,
const float cursor_position[2])
{
BLI_assert(curve_mask_cache->curve_mask != nullptr);
int offset = (int)floorf(diameter / 2.0f);
unsigned short *m = curve_mask_cache->curve_mask;
const int aa_samples = aa_samples_per_texel_axis(brush, radius);
const float aa_offset = 1.0f / (2.0f * (float)aa_samples);
const float aa_step = 1.0f / (float)aa_samples;
float bpos[2];
bpos[0] = cursor_position[0] - floorf(cursor_position[0]) + offset - aa_offset;
bpos[1] = cursor_position[1] - floorf(cursor_position[1]) + offset - aa_offset;
float weight_factor = 65535.0f / (float)(aa_samples * aa_samples);
for (int y = 0; y < diameter; y++) {
for (int x = 0; x < diameter; x++, m++) {
float total_weight = 0;
for (int i = 0; i < aa_samples; i++) {
for (int j = 0; j < aa_samples; j++) {
float pixel_xy[2] = {x + (aa_step * i), y + (aa_step * j)};
sub_v2_v2(pixel_xy, bpos);
const float len = len_v2(pixel_xy);
const float sample_weight = BKE_brush_curve_strength_clamped(brush, len, radius);
total_weight += sample_weight;
}
}
*m = (unsigned short)(total_weight * weight_factor);
}
}
}
static size_t diameter_to_curve_mask_size(const int diameter)
{
return diameter * diameter * sizeof(ushort);
}
static bool is_curve_mask_size_valid(const CurveMaskCache *curve_mask_cache, const int diameter)
{
return curve_mask_cache->curve_mask_size == diameter_to_curve_mask_size(diameter);
}
static void curve_mask_free(CurveMaskCache *curve_mask_cache)
{
curve_mask_cache->curve_mask_size = 0;
MEM_SAFE_FREE(curve_mask_cache->curve_mask);
}
static void curve_mask_allocate(CurveMaskCache *curve_mask_cache, const int diameter)
{
const size_t curve_mask_size = diameter_to_curve_mask_size(diameter);
curve_mask_cache->curve_mask = static_cast<unsigned short *>(
MEM_mallocN(curve_mask_size, __func__));
curve_mask_cache->curve_mask_size = curve_mask_size;
}
} // namespace blender::ed::sculpt_paint
using namespace blender::ed::sculpt_paint;
void paint_curve_mask_cache_free_data(CurveMaskCache *curve_mask_cache)
{
curve_mask_free(curve_mask_cache);
}
void paint_curve_mask_cache_update(CurveMaskCache *curve_mask_cache,
const Brush *brush,
const int diameter,
const float radius,
const float cursor_position[2])
{
if (!is_curve_mask_size_valid(curve_mask_cache, diameter)) {
curve_mask_free(curve_mask_cache);
curve_mask_allocate(curve_mask_cache, diameter);
}
update_curve_mask(curve_mask_cache, brush, diameter, radius, cursor_position);
}
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