brush.c

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/*
 * $Id: brush.c 37839 2011-06-27 04:05:19Z campbellbarton $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <math.h>
#include <string.h>

#include "MEM_guardedalloc.h"

#include "DNA_brush_types.h"
#include "DNA_color_types.h"
#include "DNA_scene_types.h"
#include "DNA_object_types.h"
#include "DNA_windowmanager_types.h"

#include "WM_types.h"

#include "RNA_access.h"

#include "BLI_math.h"
#include "BLI_blenlib.h"
#include "BLI_rand.h"
#include "BLI_utildefines.h"

#include "BKE_brush.h"
#include "BKE_colortools.h"
#include "BKE_global.h"
#include "BKE_image.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_paint.h"
#include "BKE_texture.h"
#include "BKE_icons.h"

#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"

#include "RE_render_ext.h" /* externtex */
#include "RE_shader_ext.h"

static void brush_set_defaults(Brush *brush)
{
        brush->blend = 0;
        brush->flag = 0;

        brush->ob_mode = OB_MODE_ALL_PAINT;

        /* BRUSH SCULPT TOOL SETTINGS */
        brush->size= 35; /* radius of the brush in pixels */
        brush->alpha= 0.5f; /* brush strength/intensity probably variable should be renamed? */
        brush->autosmooth_factor= 0.0f;
        brush->crease_pinch_factor= 0.5f;
        brush->sculpt_plane = SCULPT_DISP_DIR_AREA;
        brush->plane_offset= 0.0f; /* how far above or below the plane that is found by averaging the faces */
        brush->plane_trim= 0.5f;
        brush->clone.alpha= 0.5f;
        brush->normal_weight= 0.0f;
        brush->flag |= BRUSH_ALPHA_PRESSURE;

        /* BRUSH PAINT TOOL SETTINGS */
        brush->rgb[0]= 1.0f; /* default rgb color of the brush when painting - white */
        brush->rgb[1]= 1.0f;
        brush->rgb[2]= 1.0f;

        /* BRUSH STROKE SETTINGS */
        brush->flag |= (BRUSH_SPACE|BRUSH_SPACE_ATTEN);
        brush->spacing= 10; /* how far each brush dot should be spaced as a percentage of brush diameter */

        brush->smooth_stroke_radius= 75;
        brush->smooth_stroke_factor= 0.9f;

        brush->rate= 0.1f; /* time delay between dots of paint or sculpting when doing airbrush mode */

        brush->jitter= 0.0f;

        /* BRUSH TEXTURE SETTINGS */
        default_mtex(&brush->mtex);

        brush->texture_sample_bias= 0; /* value to added to texture samples */
        brush->texture_overlay_alpha= 33;

        /* brush appearance  */

        brush->add_col[0]= 1.00; /* add mode color is light red */
        brush->add_col[1]= 0.39;
        brush->add_col[2]= 0.39;

        brush->sub_col[0]= 0.39; /* subtract mode color is light blue */
        brush->sub_col[1]= 0.39;
        brush->sub_col[2]= 1.00;
}

/* Datablock add/copy/free/make_local */

Brush *add_brush(const char *name)
{
        Brush *brush;

        brush= alloc_libblock(&G.main->brush, ID_BR, name);

        /* enable fake user by default */
        brush->id.flag |= LIB_FAKEUSER;

        brush_set_defaults(brush);

        brush->sculpt_tool = SCULPT_TOOL_DRAW; /* sculpting defaults to the draw tool for new brushes */

         /* the default alpha falloff curve */
        brush_curve_preset(brush, CURVE_PRESET_SMOOTH);

        return brush;
}

Brush *copy_brush(Brush *brush)
{
        Brush *brushn;
        
        brushn= copy_libblock(brush);

        if (brush->mtex.tex)
                id_us_plus((ID*)brush->mtex.tex);

        if (brush->icon_imbuf)
                brushn->icon_imbuf= IMB_dupImBuf(brush->icon_imbuf);

        brushn->preview = NULL;

        brushn->curve= curvemapping_copy(brush->curve);

        /* enable fake user by default */
        if (!(brushn->id.flag & LIB_FAKEUSER)) {
                brushn->id.flag |= LIB_FAKEUSER;
                brushn->id.us++;
        }
        
        return brushn;
}

/* not brush itself */
void free_brush(Brush *brush)
{
        if (brush->mtex.tex)
                brush->mtex.tex->id.us--;

        if (brush->icon_imbuf)
                IMB_freeImBuf(brush->icon_imbuf);

        BKE_previewimg_free(&(brush->preview));

        curvemapping_free(brush->curve);
}

static void extern_local_brush(Brush *brush)
{
        id_lib_extern((ID *)brush->mtex.tex);
}

void make_local_brush(Brush *brush)
{

        /* - only lib users: do nothing
         * - only local users: set flag
         * - mixed: make copy
         */

        Main *bmain= G.main;
        Scene *scene;
        int local= 0, lib= 0;

        if(brush->id.lib==NULL) return;

        if(brush->clone.image) {
                /* special case: ima always local immediately */
                brush->clone.image->id.lib= NULL;
                brush->clone.image->id.flag= LIB_LOCAL;
                new_id(&bmain->brush, (ID *)brush->clone.image, NULL);
                extern_local_brush(brush);
        }

        for(scene= bmain->scene.first; scene && ELEM(0, lib, local); scene=scene->id.next) {
                if(paint_brush(&scene->toolsettings->imapaint.paint)==brush) {
                        if(scene->id.lib) lib= 1;
                        else local= 1;
                }
        }

        if(local && lib==0) {
                brush->id.lib= NULL;
                brush->id.flag= LIB_LOCAL;
                new_id(&bmain->brush, (ID *)brush, NULL);
                extern_local_brush(brush);

                /* enable fake user by default */
                if (!(brush->id.flag & LIB_FAKEUSER)) {
                        brush->id.flag |= LIB_FAKEUSER;
                        brush->id.us++;
                }
        }
        else if(local && lib) {
                Brush *brushn= copy_brush(brush);
                brushn->id.us= 1; /* only keep fake user */
                brushn->id.flag |= LIB_FAKEUSER;
                
                for(scene= bmain->scene.first; scene; scene=scene->id.next) {
                        if(paint_brush(&scene->toolsettings->imapaint.paint)==brush) {
                                if(scene->id.lib==NULL) {
                                        paint_brush_set(&scene->toolsettings->imapaint.paint, brushn);
                                }
                        }
                }
        }
}

void brush_debug_print_state(Brush *br)
{
        /* create a fake brush and set it to the defaults */
        Brush def= {{NULL}};
        brush_set_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")
        

        /* 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_TORUS);
        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_FIXED_TEX);
        BR_TEST_FLAG(BRUSH_RAKE);
        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_TEXTURE_OVERLAY);
        BR_TEST_FLAG(BRUSH_EDGE_TO_EDGE);
        BR_TEST_FLAG(BRUSH_RESTORE_MESH);
        BR_TEST_FLAG(BRUSH_INVERSE_SMOOTH_PRESSURE);
        BR_TEST_FLAG(BRUSH_RANDOM_ROTATION);
        BR_TEST_FLAG(BRUSH_PLANE_TRIM);
        BR_TEST_FLAG(BRUSH_FRONTFACE);
        BR_TEST_FLAG(BRUSH_CUSTOM_ICON);

        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(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(sub_col[0], f);
        BR_TEST(sub_col[1], f);
        BR_TEST(sub_col[2], f);

        printf("\n");
        
#undef BR_TEST
#undef BR_TEST_FLAG
}

void brush_reset_sculpt(Brush *br)
{
        /* enable this to see any non-default
           settings used by a brush:

           brush_debug_print_state(br);
        */

        brush_set_defaults(br);
        brush_curve_preset(br, CURVE_PRESET_SMOOTH);

        switch(br->sculpt_tool) {
        case SCULPT_TOOL_CLAY:
                br->flag |= BRUSH_FRONTFACE;
                break;
        case SCULPT_TOOL_CREASE:
                br->flag |= BRUSH_DIR_IN;
                br->alpha = 0.25;
                break;
        case SCULPT_TOOL_FILL:
                br->add_col[1] = 1;
                br->sub_col[0] = 0.25;
                br->sub_col[1] = 1;
                break;
        case SCULPT_TOOL_FLATTEN:
                br->add_col[1] = 1;
                br->sub_col[0] = 0.25;
                br->sub_col[1] = 1;
                break;
        case SCULPT_TOOL_INFLATE:
                br->add_col[0] = 0.750000;
                br->add_col[1] = 0.750000;
                br->add_col[2] = 0.750000;
                br->sub_col[0] = 0.250000;
                br->sub_col[1] = 0.250000;
                br->sub_col[2] = 0.250000;
                break;
        case SCULPT_TOOL_NUDGE:
                br->add_col[0] = 0.250000;
                br->add_col[1] = 1.000000;
                br->add_col[2] = 0.250000;
                break;
        case SCULPT_TOOL_PINCH:
                br->add_col[0] = 0.750000;
                br->add_col[1] = 0.750000;
                br->add_col[2] = 0.750000;
                br->sub_col[0] = 0.250000;
                br->sub_col[1] = 0.250000;
                br->sub_col[2] = 0.250000;
                break;
        case SCULPT_TOOL_SCRAPE:
                br->add_col[1] = 1.000000;
                br->sub_col[0] = 0.250000;
                br->sub_col[1] = 1.000000;
                break;
        case SCULPT_TOOL_ROTATE:
                break;
        case SCULPT_TOOL_SMOOTH:
                br->flag &= ~BRUSH_SPACE_ATTEN;
                br->spacing = 5;
                br->add_col[0] = 0.750000;
                br->add_col[1] = 0.750000;
                br->add_col[2] = 0.750000;
                break;
        case SCULPT_TOOL_GRAB:
        case SCULPT_TOOL_SNAKE_HOOK:
        case SCULPT_TOOL_THUMB:
                br->size = 75;
                br->flag &= ~BRUSH_ALPHA_PRESSURE;
                br->flag &= ~BRUSH_SPACE;
                br->flag &= ~BRUSH_SPACE_ATTEN;
                br->add_col[0] = 0.250000;
                br->add_col[1] = 1.000000;
                br->add_col[2] = 0.250000;
                break;
        default:
                break;
        }
}

/* Library Operations */
void brush_curve_preset(Brush *b, /*CurveMappingPreset*/int preset)
{
        CurveMap *cm = NULL;

        if(!b->curve)
                b->curve = curvemapping_add(1, 0, 0, 1, 1);

        cm = b->curve->cm;
        cm->flag &= ~CUMA_EXTEND_EXTRAPOLATE;

        b->curve->preset = preset;
        curvemap_reset(cm, &b->curve->clipr, b->curve->preset, CURVEMAP_SLOPE_NEGATIVE);
        curvemapping_changed(b->curve, 0);
}

int brush_texture_set_nr(Brush *brush, int nr)
{
        ID *idtest, *id=NULL;

        id= (ID *)brush->mtex.tex;

        idtest= (ID*)BLI_findlink(&G.main->tex, nr-1);
        if(idtest==NULL) { /* new tex */
                if(id) idtest= (ID *)copy_texture((Tex *)id);
                else idtest= (ID *)add_texture("Tex");
                idtest->us--;
        }
        if(idtest!=id) {
                brush_texture_delete(brush);

                brush->mtex.tex= (Tex*)idtest;
                id_us_plus(idtest);

                return 1;
        }

        return 0;
}

int brush_texture_delete(Brush *brush)
{
        if(brush->mtex.tex)
                brush->mtex.tex->id.us--;

        return 1;
}

int brush_clone_image_set_nr(Brush *brush, int nr)
{
        if(brush && nr > 0) {
                Image *ima= (Image*)BLI_findlink(&G.main->image, nr-1);

                if(ima) {
                        brush_clone_image_delete(brush);
                        brush->clone.image= ima;
                        id_us_plus(&ima->id);
                        brush->clone.offset[0]= brush->clone.offset[1]= 0.0f;

                        return 1;
                }
        }

        return 0;
}

int brush_clone_image_delete(Brush *brush)
{
        if (brush && brush->clone.image) {
                brush->clone.image->id.us--;
                brush->clone.image= NULL;
                return 1;
        }

        return 0;
}

/* Brush Sampling */
void brush_sample_tex(Brush *brush, float *xy, float *rgba, const int thread)
{
        MTex *mtex= &brush->mtex;

        if (mtex && mtex->tex) {
                float co[3], tin, tr, tg, tb, ta;
                int hasrgb;
                const int radius= brush_size(brush);

                co[0]= xy[0]/radius;
                co[1]= xy[1]/radius;
                co[2]= 0.0f;

                hasrgb= externtex(mtex, co, &tin, &tr, &tg, &tb, &ta, thread);

                if (hasrgb) {
                        rgba[0]= tr;
                        rgba[1]= tg;
                        rgba[2]= tb;
                        rgba[3]= ta;
                }
                else {
                        rgba[0]= tin;
                        rgba[1]= tin;
                        rgba[2]= tin;
                        rgba[3]= 1.0f;
                }
        }
        else if (rgba)
                rgba[0]= rgba[1]= rgba[2]= rgba[3]= 1.0f;
}


void brush_imbuf_new(Brush *brush, short flt, short texfall, int bufsize, ImBuf **outbuf, int use_color_correction)
{
        ImBuf *ibuf;
        float xy[2], dist, rgba[4], *dstf;
        int x, y, rowbytes, xoff, yoff, imbflag;
        const int radius= brush_size(brush);
        char *dst, crgb[3];
        const float alpha= brush_alpha(brush);
        float brush_rgb[3];
    
        imbflag= (flt)? IB_rectfloat: IB_rect;
        xoff = -bufsize/2.0f + 0.5f;
        yoff = -bufsize/2.0f + 0.5f;
        rowbytes= bufsize*4;

        if (*outbuf)
                ibuf= *outbuf;
        else
                ibuf= IMB_allocImBuf(bufsize, bufsize, 32, imbflag);

        if (flt) {
                copy_v3_v3(brush_rgb, brush->rgb);
                if(use_color_correction){
                        srgb_to_linearrgb_v3_v3(brush_rgb, brush_rgb);
                }

                for (y=0; y < ibuf->y; y++) {
                        dstf = ibuf->rect_float + y*rowbytes;

                        for (x=0; x < ibuf->x; x++, dstf+=4) {
                                xy[0] = x + xoff;
                                xy[1] = y + yoff;

                                if (texfall == 0) {
                                        dist = sqrt(xy[0]*xy[0] + xy[1]*xy[1]);

                                        VECCOPY(dstf, brush_rgb);
                                        dstf[3]= alpha*brush_curve_strength_clamp(brush, dist, radius);
                                }
                                else if (texfall == 1) {
                                        brush_sample_tex(brush, xy, dstf, 0);
                                }
                                else {
                                        dist = sqrt(xy[0]*xy[0] + xy[1]*xy[1]);

                                        brush_sample_tex(brush, xy, rgba, 0);
                                        mul_v3_v3v3(dstf, rgba, brush_rgb);
                                        dstf[3] = rgba[3]*alpha*brush_curve_strength_clamp(brush, dist, radius);
                                }
                        }
                }
        }
        else {
                crgb[0]= FTOCHAR(brush->rgb[0]);
                crgb[1]= FTOCHAR(brush->rgb[1]);
                crgb[2]= FTOCHAR(brush->rgb[2]);

                for (y=0; y < ibuf->y; y++) {
                        dst = (char*)ibuf->rect + y*rowbytes;

                        for (x=0; x < ibuf->x; x++, dst+=4) {
                                xy[0] = x + xoff;
                                xy[1] = y + yoff;

                                if (texfall == 0) {
                                        dist = sqrt(xy[0]*xy[0] + xy[1]*xy[1]);

                                        dst[0]= crgb[0];
                                        dst[1]= crgb[1];
                                        dst[2]= crgb[2];
                                        dst[3]= FTOCHAR(alpha*brush_curve_strength(brush, dist, radius));
                                }
                                else if (texfall == 1) {
                                        brush_sample_tex(brush, xy, rgba, 0);
                                        dst[0]= FTOCHAR(rgba[0]);
                                        dst[1]= FTOCHAR(rgba[1]);
                                        dst[2]= FTOCHAR(rgba[2]);
                                        dst[3]= FTOCHAR(rgba[3]);
                                }
                                else if (texfall == 2) {
                                        dist = sqrt(xy[0]*xy[0] + xy[1]*xy[1]);

                                        brush_sample_tex(brush, xy, rgba, 0);
                                        dst[0] = FTOCHAR(rgba[0]*brush->rgb[0]);
                                        dst[1] = FTOCHAR(rgba[1]*brush->rgb[1]);
                                        dst[2] = FTOCHAR(rgba[2]*brush->rgb[2]);
                                        dst[3] = FTOCHAR(rgba[3]*alpha*brush_curve_strength_clamp(brush, dist, radius));
                                } else {
                                        dist = sqrt(xy[0]*xy[0] + xy[1]*xy[1]);

                                        brush_sample_tex(brush, xy, rgba, 0);
                                        dst[0]= crgb[0];
                                        dst[1]= crgb[1];
                                        dst[2]= crgb[2];
                                        dst[3] = FTOCHAR(rgba[3]*alpha*brush_curve_strength_clamp(brush, dist, radius));
                                }
                        }
                }
        }

        *outbuf= ibuf;
}

/* Brush Painting */

typedef struct BrushPainterCache {
        short enabled;

        int size;                       /* size override, if 0 uses 2*brush_size(brush) */
        short flt;                      /* need float imbuf? */
        short texonly;          /* no alpha, color or fallof, only texture in imbuf */

        int lastsize;
        float lastalpha;
        float lastjitter;

        ImBuf *ibuf;
        ImBuf *texibuf;
        ImBuf *maskibuf;
} BrushPainterCache;

struct BrushPainter {
        Brush *brush;

        float lastmousepos[2];  /* mouse position of last paint call */

        float accumdistance;    /* accumulated distance of brush since last paint op */
        float lastpaintpos[2];  /* position of last paint op */
        float startpaintpos[2]; /* position of first paint */

        double accumtime;               /* accumulated time since last paint op (airbrush) */
        double lasttime;                /* time of last update */

        float lastpressure;

        short firsttouch;               /* first paint op */

        float startsize;
        float startalpha;
        float startjitter;
        float startspacing;

        BrushPainterCache cache;
};

BrushPainter *brush_painter_new(Brush *brush)
{
        BrushPainter *painter= MEM_callocN(sizeof(BrushPainter), "BrushPainter");

        painter->brush= brush;
        painter->firsttouch= 1;
        painter->cache.lastsize= -1; /* force ibuf create in refresh */

        painter->startsize = brush_size(brush);
        painter->startalpha = brush_alpha(brush);
        painter->startjitter = brush->jitter;
        painter->startspacing = brush->spacing;

        return painter;
}

void brush_painter_require_imbuf(BrushPainter *painter, short flt, short texonly, int size)
{
        if ((painter->cache.flt != flt) || (painter->cache.size != size) ||
                ((painter->cache.texonly != texonly) && texonly)) {
                if (painter->cache.ibuf) IMB_freeImBuf(painter->cache.ibuf);
                if (painter->cache.maskibuf) IMB_freeImBuf(painter->cache.maskibuf);
                painter->cache.ibuf= painter->cache.maskibuf= NULL;
                painter->cache.lastsize= -1; /* force ibuf create in refresh */
        }

        if (painter->cache.flt != flt) {
                if (painter->cache.texibuf) IMB_freeImBuf(painter->cache.texibuf);
                painter->cache.texibuf= NULL;
                painter->cache.lastsize= -1; /* force ibuf create in refresh */
        }

        painter->cache.size= size;
        painter->cache.flt= flt;
        painter->cache.texonly= texonly;
        painter->cache.enabled= 1;
}

void brush_painter_free(BrushPainter *painter)
{
        Brush *brush = painter->brush;

        brush_set_size(brush, painter->startsize);
        brush_set_alpha(brush, painter->startalpha);
        brush->jitter = painter->startjitter;
        brush->spacing = painter->startspacing;

        if (painter->cache.ibuf) IMB_freeImBuf(painter->cache.ibuf);
        if (painter->cache.texibuf) IMB_freeImBuf(painter->cache.texibuf);
        if (painter->cache.maskibuf) IMB_freeImBuf(painter->cache.maskibuf);
        MEM_freeN(painter);
}

static void brush_painter_do_partial(BrushPainter *painter, ImBuf *oldtexibuf, int x, int y, int w, int h, int xt, int yt, float *pos)
{
        Brush *brush= painter->brush;
        ImBuf *ibuf, *maskibuf, *texibuf;
        float *bf, *mf, *tf, *otf=NULL, xoff, yoff, xy[2], rgba[4];
        char *b, *m, *t, *ot= NULL;
        int dotexold, origx= x, origy= y;
        const int radius= brush_size(brush);

        xoff = -radius + 0.5f;
        yoff = -radius + 0.5f;
        xoff += (int)pos[0] - (int)painter->startpaintpos[0];
        yoff += (int)pos[1] - (int)painter->startpaintpos[1];

        ibuf = painter->cache.ibuf;
        texibuf = painter->cache.texibuf;
        maskibuf = painter->cache.maskibuf;

        dotexold = (oldtexibuf != NULL);

        /* not sure if it's actually needed or it's a mistake in coords/sizes
           calculation in brush_painter_fixed_tex_partial_update(), but without this
           limitation memory gets corrupted at fast strokes with quite big spacing (sergey) */
        w = MIN2(w, ibuf->x);
        h = MIN2(h, ibuf->y);

        if (painter->cache.flt) {
                for (; y < h; y++) {
                        bf = ibuf->rect_float + (y*ibuf->x + origx)*4;
                        tf = texibuf->rect_float + (y*texibuf->x + origx)*4;
                        mf = maskibuf->rect_float + (y*maskibuf->x + origx)*4;

                        if (dotexold)
                                otf = oldtexibuf->rect_float + ((y - origy + yt)*oldtexibuf->x + xt)*4;

                        for (x=origx; x < w; x++, bf+=4, mf+=4, tf+=4) {
                                if (dotexold) {
                                        VECCOPY(tf, otf);
                                        tf[3] = otf[3];
                                        otf += 4;
                                }
                                else {
                                        xy[0] = x + xoff;
                                        xy[1] = y + yoff;

                                        brush_sample_tex(brush, xy, tf, 0);
                                }

                                bf[0] = tf[0]*mf[0];
                                bf[1] = tf[1]*mf[1];
                                bf[2] = tf[2]*mf[2];
                                bf[3] = tf[3]*mf[3];
                        }
                }
        }
        else {
                for (; y < h; y++) {
                        b = (char*)ibuf->rect + (y*ibuf->x + origx)*4;
                        t = (char*)texibuf->rect + (y*texibuf->x + origx)*4;
                        m = (char*)maskibuf->rect + (y*maskibuf->x + origx)*4;

                        if (dotexold)
                                ot = (char*)oldtexibuf->rect + ((y - origy + yt)*oldtexibuf->x + xt)*4;

                        for (x=origx; x < w; x++, b+=4, m+=4, t+=4) {
                                if (dotexold) {
                                        t[0] = ot[0];
                                        t[1] = ot[1];
                                        t[2] = ot[2];
                                        t[3] = ot[3];
                                        ot += 4;
                                }
                                else {
                                        xy[0] = x + xoff;
                                        xy[1] = y + yoff;

                                        brush_sample_tex(brush, xy, rgba, 0);
                                        t[0]= FTOCHAR(rgba[0]);
                                        t[1]= FTOCHAR(rgba[1]);
                                        t[2]= FTOCHAR(rgba[2]);
                                        t[3]= FTOCHAR(rgba[3]);
                                }

                                b[0] = t[0]*m[0]/255;
                                b[1] = t[1]*m[1]/255;
                                b[2] = t[2]*m[2]/255;
                                b[3] = t[3]*m[3]/255;
                        }
                }
        }
}

static void brush_painter_fixed_tex_partial_update(BrushPainter *painter, float *pos)
{
        Brush *brush= painter->brush;
        BrushPainterCache *cache= &painter->cache;
        ImBuf *oldtexibuf, *ibuf;
        int imbflag, destx, desty, srcx, srcy, w, h, x1, y1, x2, y2;
        const int diameter= 2*brush_size(brush);

        imbflag= (cache->flt)? IB_rectfloat: IB_rect;
        if (!cache->ibuf)
                cache->ibuf= IMB_allocImBuf(diameter, diameter, 32, imbflag);
        ibuf= cache->ibuf;

        oldtexibuf= cache->texibuf;
        cache->texibuf= IMB_allocImBuf(diameter, diameter, 32, imbflag);

        if (oldtexibuf) {
                srcx= srcy= 0;
                destx= (int)painter->lastpaintpos[0] - (int)pos[0];
                desty= (int)painter->lastpaintpos[1] - (int)pos[1];
                w= oldtexibuf->x;
                h= oldtexibuf->y;

                IMB_rectclip(cache->texibuf, oldtexibuf, &destx, &desty, &srcx, &srcy, &w, &h);
        }
        else {
                srcx= srcy= 0;
                destx= desty= 0;
                w= h= 0;
        }
        
        x1= destx;
        y1= desty;
        x2= destx+w;
        y2= desty+h;

        /* blend existing texture in new position */
        if ((x1 < x2) && (y1 < y2))
                brush_painter_do_partial(painter, oldtexibuf, x1, y1, x2, y2, srcx, srcy, pos);

        if (oldtexibuf)
                IMB_freeImBuf(oldtexibuf);

        /* sample texture in new areas */
        if ((0 < x1) && (0 < ibuf->y))
                brush_painter_do_partial(painter, NULL, 0, 0, x1, ibuf->y, 0, 0, pos);
        if ((x2 < ibuf->x) && (0 < ibuf->y))
                brush_painter_do_partial(painter, NULL, x2, 0, ibuf->x, ibuf->y, 0, 0, pos);
        if ((x1 < x2) && (0 < y1))
                brush_painter_do_partial(painter, NULL, x1, 0, x2, y1, 0, 0, pos);
        if ((x1 < x2) && (y2 < ibuf->y))
                brush_painter_do_partial(painter, NULL, x1, y2, x2, ibuf->y, 0, 0, pos);
}

static void brush_painter_refresh_cache(BrushPainter *painter, float *pos, int use_color_correction)
{
        Brush *brush= painter->brush;
        BrushPainterCache *cache= &painter->cache;
        MTex *mtex= &brush->mtex;
        int size;
        short flt;
        const int diameter= 2*brush_size(brush);
        const float alpha= brush_alpha(brush);

        if (diameter != cache->lastsize ||
                alpha != cache->lastalpha ||
                brush->jitter != cache->lastjitter)
        {
                if (cache->ibuf) {
                        IMB_freeImBuf(cache->ibuf);
                        cache->ibuf= NULL;
                }
                if (cache->maskibuf) {
                        IMB_freeImBuf(cache->maskibuf);
                        cache->maskibuf= NULL;
                }

                flt= cache->flt;
                size= (cache->size)? cache->size: diameter;

                if (brush->flag & BRUSH_FIXED_TEX) {
                        brush_imbuf_new(brush, flt, 3, size, &cache->maskibuf, use_color_correction);
                        brush_painter_fixed_tex_partial_update(painter, pos);
                }
                else
                        brush_imbuf_new(brush, flt, 2, size, &cache->ibuf, use_color_correction);

                cache->lastsize= diameter;
                cache->lastalpha= alpha;
                cache->lastjitter= brush->jitter;
        }
        else if ((brush->flag & BRUSH_FIXED_TEX) && mtex && mtex->tex) {
                int dx = (int)painter->lastpaintpos[0] - (int)pos[0];
                int dy = (int)painter->lastpaintpos[1] - (int)pos[1];

                if ((dx != 0) || (dy != 0))
                        brush_painter_fixed_tex_partial_update(painter, pos);
        }
}

void brush_painter_break_stroke(BrushPainter *painter)
{
        painter->firsttouch= 1;
}

static void brush_apply_pressure(BrushPainter *painter, Brush *brush, float pressure)
{
        if (brush_use_alpha_pressure(brush)) 
                brush_set_alpha(brush, MAX2(0.0f, painter->startalpha*pressure));
        if (brush_use_size_pressure(brush))
                brush_set_size(brush, MAX2(1.0f, painter->startsize*pressure));
        if (brush->flag & BRUSH_JITTER_PRESSURE)
                brush->jitter = MAX2(0.0f, painter->startjitter*pressure);
        if (brush->flag & BRUSH_SPACING_PRESSURE)
                brush->spacing = MAX2(1.0f, painter->startspacing*(1.5f-pressure));
}

void brush_jitter_pos(Brush *brush, float *pos, float *jitterpos)
{
        int use_jitter= brush->jitter != 0;

        /* jitter-ed brush gives wierd and unpredictable result for this
           kinds of stroke, so manyally disable jitter usage (sergey) */
        use_jitter&= (brush->flag & (BRUSH_RESTORE_MESH|BRUSH_ANCHORED)) == 0;

        if(use_jitter){
                float rand_pos[2];
                const int radius= brush_size(brush);
                const int diameter= 2*radius;

                // find random position within a circle of diameter 1
                do {
                        rand_pos[0] = BLI_frand()-0.5f;
                        rand_pos[1] = BLI_frand()-0.5f;
                } while (len_v2(rand_pos) > 0.5f);

                jitterpos[0] = pos[0] + 2*rand_pos[0]*diameter*brush->jitter;
                jitterpos[1] = pos[1] + 2*rand_pos[1]*diameter*brush->jitter;
        }
        else {
                VECCOPY2D(jitterpos, pos);
        }
}

int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, double time, float pressure, void *user, int use_color_correction)
{
        Brush *brush= painter->brush;
        int totpaintops= 0;

        if (pressure == 0.0f) {
                if(painter->lastpressure) // XXX - hack, operator misses
                        pressure= painter->lastpressure;
                else
                        pressure = 1.0f;        /* zero pressure == not using tablet */
        }
        if (painter->firsttouch) {
                /* paint exactly once on first touch */
                painter->startpaintpos[0]= pos[0];
                painter->startpaintpos[1]= pos[1];

                brush_apply_pressure(painter, brush, pressure);
                if (painter->cache.enabled)
                        brush_painter_refresh_cache(painter, pos, use_color_correction);
                totpaintops += func(user, painter->cache.ibuf, pos, pos);
                
                painter->lasttime= time;
                painter->firsttouch= 0;
                painter->lastpaintpos[0]= pos[0];
                painter->lastpaintpos[1]= pos[1];
        }
#if 0
        else if (painter->brush->flag & BRUSH_AIRBRUSH) {
                float spacing, step, paintpos[2], dmousepos[2], len;
                double starttime, curtime= time;

                /* compute brush spacing adapted to brush size */
                spacing= brush->rate; //radius*brush->spacing*0.01f;

                /* setup starting time, direction vector and accumulated time */
                starttime= painter->accumtime;
                sub_v2_v2v2(dmousepos, pos, painter->lastmousepos);
                len= normalize_v2(dmousepos);
                painter->accumtime += curtime - painter->lasttime;

                /* do paint op over unpainted time distance */
                while (painter->accumtime >= spacing) {
                        step= (spacing - starttime)*len;
                        paintpos[0]= painter->lastmousepos[0] + dmousepos[0]*step;
                        paintpos[1]= painter->lastmousepos[1] + dmousepos[1]*step;

                        if (painter->cache.enabled)
                                brush_painter_refresh_cache(painter);
                        totpaintops += func(user, painter->cache.ibuf,
                                painter->lastpaintpos, paintpos);

                        painter->lastpaintpos[0]= paintpos[0];
                        painter->lastpaintpos[1]= paintpos[1];
                        painter->accumtime -= spacing;
                        starttime -= spacing;
                }
                
                painter->lasttime= curtime;
        }
#endif
        else {
                float startdistance, spacing, step, paintpos[2], dmousepos[2], finalpos[2];
                float t, len, press;
                const int radius= brush_size(brush);

                /* compute brush spacing adapted to brush radius, spacing may depend
                   on pressure, so update it */
                brush_apply_pressure(painter, brush, painter->lastpressure);
                spacing= MAX2(1.0f, radius)*brush->spacing*0.01f;

                /* setup starting distance, direction vector and accumulated distance */
                startdistance= painter->accumdistance;
                sub_v2_v2v2(dmousepos, pos, painter->lastmousepos);
                len= normalize_v2(dmousepos);
                painter->accumdistance += len;

                if (brush->flag & BRUSH_SPACE) {
                        /* do paint op over unpainted distance */
                        while ((len > 0.0f) && (painter->accumdistance >= spacing)) {
                                step= spacing - startdistance;
                                paintpos[0]= painter->lastmousepos[0] + dmousepos[0]*step;
                                paintpos[1]= painter->lastmousepos[1] + dmousepos[1]*step;

                                t = step/len;
                                press= (1.0f-t)*painter->lastpressure + t*pressure;
                                brush_apply_pressure(painter, brush, press);
                                spacing= MAX2(1.0f, radius)*brush->spacing*0.01f;

                                brush_jitter_pos(brush, paintpos, finalpos);

                                if (painter->cache.enabled)
                                        brush_painter_refresh_cache(painter, finalpos, use_color_correction);

                                totpaintops +=
                                        func(user, painter->cache.ibuf, painter->lastpaintpos, finalpos);

                                painter->lastpaintpos[0]= paintpos[0];
                                painter->lastpaintpos[1]= paintpos[1];
                                painter->accumdistance -= spacing;
                                startdistance -= spacing;
                        }
                } else {
                        brush_jitter_pos(brush, pos, finalpos);

                        if (painter->cache.enabled)
                                brush_painter_refresh_cache(painter, finalpos, use_color_correction);

                        totpaintops += func(user, painter->cache.ibuf, pos, finalpos);

                        painter->lastpaintpos[0]= pos[0];
                        painter->lastpaintpos[1]= pos[1];
                        painter->accumdistance= 0;
                }

                /* do airbrush paint ops, based on the number of paint ops left over
                   from regular painting. this is a temporary solution until we have
                   accurate time stamps for mouse move events */
                if (brush->flag & BRUSH_AIRBRUSH) {
                        double curtime= time;
                        double painttime= brush->rate*totpaintops;

                        painter->accumtime += curtime - painter->lasttime;
                        if (painter->accumtime <= painttime)
                                painter->accumtime= 0.0;
                        else
                                painter->accumtime -= painttime;

                        while (painter->accumtime >= (double)brush->rate) {
                                brush_apply_pressure(painter, brush, pressure);

                                brush_jitter_pos(brush, pos, finalpos);

                                if (painter->cache.enabled)
                                        brush_painter_refresh_cache(painter, finalpos, use_color_correction);

                                totpaintops +=
                                        func(user, painter->cache.ibuf, painter->lastmousepos, finalpos);
                                painter->accumtime -= (double)brush->rate;
                        }

                        painter->lasttime= curtime;
                }
        }

        painter->lastmousepos[0]= pos[0];
        painter->lastmousepos[1]= pos[1];
        painter->lastpressure= pressure;

        brush_set_alpha(brush, painter->startalpha);
        brush_set_size(brush, painter->startsize);
        brush->jitter = painter->startjitter;
        brush->spacing = painter->startspacing;

        return totpaintops;
}

/* Uses the brush curve control to find a strength value between 0 and 1 */
float brush_curve_strength_clamp(Brush *br, float p, const float len)
{
        if(p >= len)    return 0;
        else                    p= p/len;

        p= curvemapping_evaluateF(br->curve, 0, p);
        if(p < 0.0f)            p= 0.0f;
        else if(p > 1.0f)       p= 1.0f;
        return p;
}
/* same as above but can return negative values if the curve enables
 * used for sculpt only */
float brush_curve_strength(Brush *br, float p, const float len)
{
        if(p >= len)
                p= 1.0f;
        else
                p= p/len;

        return curvemapping_evaluateF(br->curve, 0, p);
}

/* TODO: should probably be unified with BrushPainter stuff? */
unsigned int *brush_gen_texture_cache(Brush *br, int half_side)
{
        unsigned int *texcache = NULL;
        MTex *mtex = &br->mtex;
        TexResult texres= {0};
        int hasrgb, 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");

                BKE_image_get_ibuf(mtex->tex->ima, NULL);
                
                /*do normalized cannonical 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 */
                                hasrgb = multitex_ext(mtex->tex, co, NULL, NULL, 0, &texres);
                        
                                /* if the texture gave an RGB value, we assume it didn't give a valid
                                 * intensity, so calculate one (formula from do_material_tex).
                                 * if the texture didn't give an RGB value, copy the intensity across
                                 */
                                if(hasrgb & TEX_RGB)
                                        texres.tin = (0.35f * texres.tr + 0.45f *
                                                                  texres.tg + 0.2f * texres.tb);

                                texres.tin = texres.tin * 255.0f;
                                ((char*)texcache)[(iy*side+ix)*4] = (char)texres.tin;
                                ((char*)texcache)[(iy*side+ix)*4+1] = (char)texres.tin;
                                ((char*)texcache)[(iy*side+ix)*4+2] = (char)texres.tin;
                                ((char*)texcache)[(iy*side+ix)*4+3] = (char)texres.tin;
                        }
                }
        }

        return texcache;
}

/**** Radial Control ****/
struct ImBuf *brush_gen_radial_control_imbuf(Brush *br)
{
        ImBuf *im = MEM_callocN(sizeof(ImBuf), "radial control texture");
        unsigned int *texcache;
        int side = 128;
        int half = side / 2;
        int i, j;

        texcache = brush_gen_texture_cache(br, half);
        im->rect_float = MEM_callocN(sizeof(float) * side * side, "radial control rect");
        im->x = im->y = side;

        for(i=0; i<side; ++i) {
                for(j=0; j<side; ++j) {
                        float magn= sqrt(pow(i - half, 2) + pow(j - half, 2));
                        im->rect_float[i*side + j]= brush_curve_strength_clamp(br, magn, half);
                }
        }

        /* Modulate curve with texture */
        if(texcache) {
                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;
}

/* Unified Size and Strength */

static void set_unified_settings(Brush *brush, short flag, int value)
{
        Scene *sce;
        for (sce= G.main->scene.first; sce; sce= sce->id.next) {
                if (sce->toolsettings && 
                        ELEM4(brush,
                            paint_brush(&(sce->toolsettings->imapaint.paint)),
                            paint_brush(&(sce->toolsettings->vpaint->paint)),
                            paint_brush(&(sce->toolsettings->wpaint->paint)),
                            paint_brush(&(sce->toolsettings->sculpt->paint))))
                {
                        if (value)
                                sce->toolsettings->sculpt_paint_settings |= flag;
                        else
                                sce->toolsettings->sculpt_paint_settings &= ~flag;
                }
        }
}

static short unified_settings(Brush *brush)
{
        Scene *sce;
        for (sce= G.main->scene.first; sce; sce= sce->id.next) {
                if (sce->toolsettings && 
                        ELEM4(brush,
                            paint_brush(&(sce->toolsettings->imapaint.paint)),
                            paint_brush(&(sce->toolsettings->vpaint->paint)),
                            paint_brush(&(sce->toolsettings->wpaint->paint)),
                            paint_brush(&(sce->toolsettings->sculpt->paint))))
                {
                        return sce->toolsettings->sculpt_paint_settings;
                }
        }

        return 0;
}

// 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 ussual 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 anycase, a better solution is needed to prevent
// inconsistency.

static void set_unified_size(Brush *brush, int value)
{
        Scene *sce;
        for (sce= G.main->scene.first; sce; sce= sce->id.next) {
                if (sce->toolsettings && 
                        ELEM4(brush,
                            paint_brush(&(sce->toolsettings->imapaint.paint)),
                            paint_brush(&(sce->toolsettings->vpaint->paint)),
                            paint_brush(&(sce->toolsettings->wpaint->paint)),
                            paint_brush(&(sce->toolsettings->sculpt->paint))))
                {
                        sce->toolsettings->sculpt_paint_unified_size= value;
                }
        }
}

static int unified_size(Brush *brush)
{
        Scene *sce;
        for (sce= G.main->scene.first; sce; sce= sce->id.next) {
                if (sce->toolsettings && 
                        ELEM4(brush,
                            paint_brush(&(sce->toolsettings->imapaint.paint)),
                            paint_brush(&(sce->toolsettings->vpaint->paint)),
                            paint_brush(&(sce->toolsettings->wpaint->paint)),
                            paint_brush(&(sce->toolsettings->sculpt->paint))))
                {
                        return sce->toolsettings->sculpt_paint_unified_size;
                }
        }

        return 35; // XXX magic number
}

static void set_unified_alpha(Brush *brush, float value)
{
        Scene *sce;
        for (sce= G.main->scene.first; sce; sce= sce->id.next) {
                if (sce->toolsettings && 
                        ELEM4(brush,
                            paint_brush(&(sce->toolsettings->imapaint.paint)),
                            paint_brush(&(sce->toolsettings->vpaint->paint)),
                            paint_brush(&(sce->toolsettings->wpaint->paint)),
                            paint_brush(&(sce->toolsettings->sculpt->paint))))
                {
                        sce->toolsettings->sculpt_paint_unified_alpha= value;
                }
        }
}

static float unified_alpha(Brush *brush)
{
        Scene *sce;
        for (sce= G.main->scene.first; sce; sce= sce->id.next) {
                if (sce->toolsettings && 
                        ELEM4(brush,
                            paint_brush(&(sce->toolsettings->imapaint.paint)),
                            paint_brush(&(sce->toolsettings->vpaint->paint)),
                            paint_brush(&(sce->toolsettings->wpaint->paint)),
                            paint_brush(&(sce->toolsettings->sculpt->paint))))
                {
                        return sce->toolsettings->sculpt_paint_unified_alpha;
                }
        }

        return 0.5f; // XXX magic number
}

static void set_unified_unprojected_radius(Brush *brush, float value)
{
        Scene *sce;
        for (sce= G.main->scene.first; sce; sce= sce->id.next) {
                if (sce->toolsettings && 
                        ELEM4(brush,
                            paint_brush(&(sce->toolsettings->imapaint.paint)),
                            paint_brush(&(sce->toolsettings->vpaint->paint)),
                            paint_brush(&(sce->toolsettings->wpaint->paint)),
                            paint_brush(&(sce->toolsettings->sculpt->paint))))
                {
                        sce->toolsettings->sculpt_paint_unified_unprojected_radius= value;
                }
        }
}

static float unified_unprojected_radius(Brush *brush)
{
        Scene *sce;
        for (sce= G.main->scene.first; sce; sce= sce->id.next) {
                if (sce->toolsettings && 
                        ELEM4(brush,
                            paint_brush(&(sce->toolsettings->imapaint.paint)),
                            paint_brush(&(sce->toolsettings->vpaint->paint)),
                            paint_brush(&(sce->toolsettings->wpaint->paint)),
                            paint_brush(&(sce->toolsettings->sculpt->paint))))
                {
                        return sce->toolsettings->sculpt_paint_unified_unprojected_radius;
                }
        }

        return 0.125f; // XXX magic number
}
void brush_set_size(Brush *brush, int size)
{
        if (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_SIZE)
                set_unified_size(brush, size);
        else
                brush->size= size;

        //WM_main_add_notifier(NC_BRUSH|NA_EDITED, brush);
}

int brush_size(Brush *brush)
{
        return (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_SIZE) ? unified_size(brush) : brush->size;
}

void brush_set_use_locked_size(Brush *brush, int value)
{
        if (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_SIZE) {
                set_unified_settings(brush, SCULPT_PAINT_UNIFIED_LOCK_BRUSH_SIZE, value);
        }
        else {
                if (value)
                        brush->flag |= BRUSH_LOCK_SIZE;
                else
                        brush->flag &= ~BRUSH_LOCK_SIZE;
        }

        //WM_main_add_notifier(NC_BRUSH|NA_EDITED, brush);
}

int brush_use_locked_size(Brush *brush)
{
        return (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_SIZE) ? (unified_settings(brush) & SCULPT_PAINT_UNIFIED_LOCK_BRUSH_SIZE) : (brush->flag & BRUSH_LOCK_SIZE);
}

void brush_set_use_size_pressure(Brush *brush, int value)
{
        if (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_SIZE) {
                set_unified_settings(brush, SCULPT_PAINT_UNIFIED_SIZE_PRESSURE, value);
        }
        else {
                if (value)
                        brush->flag |= BRUSH_SIZE_PRESSURE;
                else
                        brush->flag &= ~BRUSH_SIZE_PRESSURE;
        }

        //WM_main_add_notifier(NC_BRUSH|NA_EDITED, brush);
}

int brush_use_size_pressure(Brush *brush)
{
        return (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_SIZE) ? (unified_settings(brush) & SCULPT_PAINT_UNIFIED_SIZE_PRESSURE) : (brush->flag & BRUSH_SIZE_PRESSURE);
}

void brush_set_use_alpha_pressure(Brush *brush, int value)
{
        if (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_ALPHA) {
                set_unified_settings(brush, SCULPT_PAINT_UNIFIED_ALPHA_PRESSURE, value);
        }
        else {
                if (value)
                        brush->flag |= BRUSH_ALPHA_PRESSURE;
                else
                        brush->flag &= ~BRUSH_ALPHA_PRESSURE;
        }

        //WM_main_add_notifier(NC_BRUSH|NA_EDITED, brush);
}

int brush_use_alpha_pressure(Brush *brush)
{
        return (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_ALPHA) ? (unified_settings(brush) & SCULPT_PAINT_UNIFIED_ALPHA_PRESSURE) : (brush->flag & BRUSH_ALPHA_PRESSURE);
}

void brush_set_unprojected_radius(Brush *brush, float unprojected_radius)
{
        if (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_SIZE)
                set_unified_unprojected_radius(brush, unprojected_radius);
        else
                brush->unprojected_radius= unprojected_radius;

        //WM_main_add_notifier(NC_BRUSH|NA_EDITED, brush);
}

float brush_unprojected_radius(Brush *brush)
{
        return (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_SIZE) ? unified_unprojected_radius(brush) : brush->unprojected_radius;
}

void brush_set_alpha(Brush *brush, float alpha)
{
        if (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_ALPHA) 
                set_unified_alpha(brush, alpha);
        else
                brush->alpha= alpha;

        //WM_main_add_notifier(NC_BRUSH|NA_EDITED, brush);
}

float brush_alpha(Brush *brush)
{
        return (unified_settings(brush) & SCULPT_PAINT_USE_UNIFIED_ALPHA) ? unified_alpha(brush) : brush->alpha;
}