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Diffstat (limited to 'source/blender/blenkernel/intern/brush.c')
| -rw-r--r-- | source/blender/blenkernel/intern/brush.c | 882 |
1 files changed, 882 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/brush.c b/source/blender/blenkernel/intern/brush.c new file mode 100644 index 00000000000..ca2f7b114d5 --- /dev/null +++ b/source/blender/blenkernel/intern/brush.c @@ -0,0 +1,882 @@ +/** + * $Id$ + * + * ***** BEGIN GPL/BL DUAL 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. The Blender + * Foundation also sells licenses for use in proprietary software under + * the Blender License. See http://www.blender.org/BL/ for information + * about this. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * 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/BL DUAL LICENSE BLOCK ***** + */ + +#include <math.h> + +#include "MEM_guardedalloc.h" + +#include "DNA_brush_types.h" +#include "DNA_image_types.h" +#include "DNA_texture_types.h" +#include "DNA_scene_types.h" + +#include "BLI_arithb.h" +#include "BLI_blenlib.h" + +#include "BKE_brush.h" +#include "BKE_global.h" +#include "BKE_library.h" +#include "BKE_main.h" +#include "BKE_texture.h" +#include "BKE_utildefines.h" + +#include "IMB_imbuf.h" +#include "IMB_imbuf_types.h" + +#include "RE_render_ext.h" /* externtex */ + +/* Datablock add/copy/free/make_local */ + +Brush *add_brush(char *name) +{ + Brush *brush; + + brush= alloc_libblock(&G.main->brush, ID_BR, name); + + brush->rgb[0]= 1.0f; + brush->rgb[1]= 1.0f; + brush->rgb[2]= 1.0f; + brush->alpha= 0.2f; + brush->size= 25; + brush->spacing= 10.0f; + brush->rate= 0.1f; + brush->innerradius= 0.5f; + brush->clone.alpha= 0.5; + + /* enable fake user by default */ + brush_toggle_fake_user(brush); + + return brush; +} + +Brush *copy_brush(Brush *brush) +{ + Brush *brushn; + MTex *mtex; + int a; + + brushn= copy_libblock(brush); + + for(a=0; a<MAX_MTEX; a++) { + mtex= brush->mtex[a]; + if(mtex) { + brushn->mtex[a]= MEM_dupallocN(mtex); + if(mtex->tex) id_us_plus((ID*)mtex->tex); + } + } + + /* enable fake user by default */ + if (!(brushn->id.flag & LIB_FAKEUSER)) + brush_toggle_fake_user(brushn); + + return brushn; +} + +/* not brush itself */ +void free_brush(Brush *brush) +{ + MTex *mtex; + int a; + + for(a=0; a<MAX_MTEX; a++) { + mtex= brush->mtex[a]; + if(mtex) { + if(mtex->tex) mtex->tex->id.us--; + MEM_freeN(mtex); + } + } +} + +void make_local_brush(Brush *brush) +{ + /* - only lib users: do nothing + * - only local users: set flag + * - mixed: make copy + */ + + Brush *brushn; + Scene *scene; + int local= 0, lib= 0; + + if(brush->id.lib==0) return; + + if(brush->clone.image) { + /* special case: ima always local immediately */ + brush->clone.image->id.lib= 0; + brush->clone.image->id.flag= LIB_LOCAL; + new_id(0, (ID *)brush->clone.image, 0); + } + + for(scene= G.main->scene.first; scene; scene=scene->id.next) + if(scene->toolsettings->imapaint.brush==brush) { + if(scene->id.lib) lib= 1; + else local= 1; + } + + if(local && lib==0) { + brush->id.lib= 0; + brush->id.flag= LIB_LOCAL; + new_id(0, (ID *)brush, 0); + + /* enable fake user by default */ + if (!(brush->id.flag & LIB_FAKEUSER)) + brush_toggle_fake_user(brush); + } + else if(local && lib) { + brushn= copy_brush(brush); + brushn->id.us= 1; /* only keep fake user */ + brushn->id.flag |= LIB_FAKEUSER; + + for(scene= G.main->scene.first; scene; scene=scene->id.next) + if(scene->toolsettings->imapaint.brush==brush) + if(scene->id.lib==0) { + scene->toolsettings->imapaint.brush= brushn; + brushn->id.us++; + brush->id.us--; + } + } +} + +/* Library Operations */ + +int brush_set_nr(Brush **current_brush, int nr) +{ + ID *idtest, *id; + + id= (ID*)(*current_brush); + idtest= (ID*)BLI_findlink(&G.main->brush, nr-1); + + if(idtest==0) { /* new brush */ + if(id) idtest= (ID *)copy_brush((Brush *)id); + else idtest= (ID *)add_brush("Brush"); + idtest->us--; + } + if(idtest!=id) { + brush_delete(current_brush); + *current_brush= (Brush *)idtest; + id_us_plus(idtest); + + return 1; + } + + return 0; +} + +int brush_delete(Brush **current_brush) +{ + if (*current_brush) { + (*current_brush)->id.us--; + *current_brush= NULL; + + return 1; + } + + return 0; +} + +void brush_toggle_fake_user(Brush *brush) +{ + ID *id= (ID*)brush; + if(id) { + if(id->flag & LIB_FAKEUSER) { + id->flag -= LIB_FAKEUSER; + id->us--; + } else { + id->flag |= LIB_FAKEUSER; + id_us_plus(id); + } + } +} + +int brush_texture_set_nr(Brush *brush, int nr) +{ + ID *idtest, *id=NULL; + + if(brush->mtex[brush->texact]) + id= (ID *)brush->mtex[brush->texact]->tex; + + idtest= (ID*)BLI_findlink(&G.main->tex, nr-1); + if(idtest==0) { /* 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); + + if(brush->mtex[brush->texact]==NULL) { + brush->mtex[brush->texact]= add_mtex(); + brush->mtex[brush->texact]->r = 1.0f; + brush->mtex[brush->texact]->g = 1.0f; + brush->mtex[brush->texact]->b = 1.0f; + } + brush->mtex[brush->texact]->tex= (Tex*)idtest; + id_us_plus(idtest); + + return 1; + } + + return 0; +} + +int brush_texture_delete(Brush *brush) +{ + if(brush->mtex[brush->texact]) { + if(brush->mtex[brush->texact]->tex) + brush->mtex[brush->texact]->tex->id.us--; + MEM_freeN(brush->mtex[brush->texact]); + brush->mtex[brush->texact]= NULL; + + return 1; + } + + return 0; +} + +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; +} + +void brush_check_exists(Brush **brush) +{ + if(*brush==NULL) + brush_set_nr(brush, 1); +} + +/* Brush Sampling */ + +/*static float taylor_approx_cos(float f) +{ + f = f*f; + f = 1.0f - f/2.0f + f*f/24.0f; + return f; +}*/ + +float brush_sample_falloff(Brush *brush, float dist) +{ + float a, outer, inner; + + outer = brush->size >> 1; + inner = outer*brush->innerradius; + + if (dist <= inner) { + return brush->alpha; + } + else if ((dist < outer) && (inner < outer)) { + a = sqrt((dist - inner)/(outer - inner)); + return (1 - a)*brush->alpha; + + /* formula used by sculpt, with taylor approx + a = 0.5f*(taylor_approx_cos(3.0f*(dist - inner)/(outer - inner)) + 1.0f); + return a*brush->alpha; */ + } + else + return 0.0f; +} + +void brush_sample_tex(Brush *brush, float *xy, float *rgba) +{ + MTex *mtex= brush->mtex[brush->texact]; + + if (mtex && mtex->tex) { + float co[3], tin, tr, tg, tb, ta; + int hasrgb; + + co[0]= xy[0]/(brush->size >> 1); + co[1]= xy[1]/(brush->size >> 1); + co[2]= 0.0f; + + hasrgb= externtex(mtex, co, &tin, &tr, &tg, &tb, &ta); + + 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; +} + +#define FTOCHAR(val) val<=0.0f?0: (val>=1.0f?255: (char)(255.0f*val)) + +void brush_imbuf_new(Brush *brush, short flt, short texfall, int size, ImBuf **outbuf) +{ + ImBuf *ibuf; + float xy[2], dist, rgba[4], *dstf; + int x, y, rowbytes, xoff, yoff, imbflag; + char *dst, crgb[3]; + + imbflag= (flt)? IB_rectfloat: IB_rect; + xoff = -size/2.0f + 0.5f; + yoff = -size/2.0f + 0.5f; + rowbytes= size*4; + + if (*outbuf) + ibuf= *outbuf; + else + ibuf= IMB_allocImBuf(size, size, 32, imbflag, 0); + + if (flt) { + 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]= brush_sample_falloff(brush, dist); + } + else if (texfall == 1) { + brush_sample_tex(brush, xy, dstf); + } + else { + dist = sqrt(xy[0]*xy[0] + xy[1]*xy[1]); + + brush_sample_tex(brush, xy, rgba); + + dstf[0] = rgba[0]*brush->rgb[0]; + dstf[1] = rgba[1]*brush->rgb[1]; + dstf[2] = rgba[2]*brush->rgb[2]; + dstf[3] = rgba[3]*brush_sample_falloff(brush, dist); + } + } + } + } + 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(brush_sample_falloff(brush, dist)); + } + else if (texfall == 1) { + brush_sample_tex(brush, xy, rgba); + dst[0]= FTOCHAR(rgba[0]); + dst[1]= FTOCHAR(rgba[1]); + dst[2]= FTOCHAR(rgba[2]); + dst[3]= FTOCHAR(rgba[3]); + } + else { + dist = sqrt(xy[0]*xy[0] + xy[1]*xy[1]); + + brush_sample_tex(brush, xy, rgba); + 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]*brush_sample_falloff(brush, dist)); + } + } + } + } + + *outbuf= ibuf; +} + +/* Brush Painting */ + +typedef struct BrushPainterCache { + short enabled; + + int size; /* size override, if 0 uses brush->size */ + short flt; /* need float imbuf? */ + short texonly; /* no alpha, color or fallof, only texture in imbuf */ + + int lastsize; + float lastalpha; + float lastinnerradius; + + 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 startinnerradius; + 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; + painter->startalpha = brush->alpha; + painter->startinnerradius = brush->innerradius; + 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->size = painter->startsize; + brush->alpha = painter->startalpha; + brush->innerradius = painter->startinnerradius; + 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; + + xoff = -brush->size/2.0f + 0.5f; + yoff = -brush->size/2.0f + 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); + + 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); + } + + 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); + 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; + } + } + } +} + +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; + + imbflag= (cache->flt)? IB_rectfloat: IB_rect; + if (!cache->ibuf) + cache->ibuf= IMB_allocImBuf(brush->size, brush->size, 32, imbflag, 0); + ibuf= cache->ibuf; + + oldtexibuf= cache->texibuf; + cache->texibuf= IMB_allocImBuf(brush->size, brush->size, 32, imbflag, 0); + + 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) +{ + Brush *brush= painter->brush; + BrushPainterCache *cache= &painter->cache; + MTex *mtex= brush->mtex[brush->texact]; + int size; + short flt; + + if ((brush->size != cache->lastsize) || (brush->alpha != cache->lastalpha) + || (brush->innerradius != cache->lastinnerradius)) { + 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: brush->size; + + if (!(mtex && mtex->tex) || (mtex->tex->type==0)) { + brush_imbuf_new(brush, flt, 0, size, &cache->ibuf); + } + else if (brush->flag & BRUSH_FIXED_TEX) { + brush_imbuf_new(brush, flt, 0, size, &cache->maskibuf); + brush_painter_fixed_tex_partial_update(painter, pos); + } + else + brush_imbuf_new(brush, flt, 2, size, &cache->ibuf); + + cache->lastsize= brush->size; + cache->lastalpha= brush->alpha; + cache->lastinnerradius= brush->innerradius; + } + 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->flag & BRUSH_ALPHA_PRESSURE) + brush->alpha = MAX2(0.0, painter->startalpha*pressure); + if (brush->flag & BRUSH_SIZE_PRESSURE) + brush->size = MAX2(1.0, painter->startsize*pressure); + if (brush->flag & BRUSH_RAD_PRESSURE) + brush->innerradius = MAX2(0.0, painter->startinnerradius*pressure); + if (brush->flag & BRUSH_SPACING_PRESSURE) + brush->spacing = MAX2(1.0, painter->startspacing*(1.5f-pressure)); +} + +int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, double time, float pressure, void *user) +{ + Brush *brush= painter->brush; + int totpaintops= 0; + + if (pressure == 0.0f) + 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); + 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; //brush->size*brush->spacing*0.01f; + + /* setup starting time, direction vector and accumulated time */ + starttime= painter->accumtime; + Vec2Subf(dmousepos, pos, painter->lastmousepos); + len= Normalize2(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]; + float t, len, press; + + /* compute brush spacing adapted to brush size, spacing may depend + on pressure, so update it */ + brush_apply_pressure(painter, brush, painter->lastpressure); + spacing= MAX2(1.0f, brush->size)*brush->spacing*0.01f; + + /* setup starting distance, direction vector and accumulated distance */ + startdistance= painter->accumdistance; + Vec2Subf(dmousepos, pos, painter->lastmousepos); + len= Normalize2(dmousepos); + painter->accumdistance += len; + + /* 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, brush->size)*brush->spacing*0.01f; + + if (painter->cache.enabled) + brush_painter_refresh_cache(painter, paintpos); + + totpaintops += + func(user, painter->cache.ibuf, painter->lastpaintpos, paintpos); + + painter->lastpaintpos[0]= paintpos[0]; + painter->lastpaintpos[1]= paintpos[1]; + painter->accumdistance -= spacing; + startdistance -= spacing; + } + + /* 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 >= brush->rate) { + brush_apply_pressure(painter, brush, pressure); + if (painter->cache.enabled) + brush_painter_refresh_cache(painter, paintpos); + totpaintops += + func(user, painter->cache.ibuf, painter->lastmousepos, pos); + painter->accumtime -= brush->rate; + } + + painter->lasttime= curtime; + } + } + + painter->lastmousepos[0]= pos[0]; + painter->lastmousepos[1]= pos[1]; + painter->lastpressure= pressure; + + brush->alpha = painter->startalpha; + brush->size = painter->startsize; + brush->innerradius = painter->startinnerradius; + brush->spacing = painter->startspacing; + + return totpaintops; +} + + |