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(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_jitter_pos(const Scene *scene, Brush *brush, const float pos[2], float jitterpos[2])
{
int use_jitter = (brush->flag & BRUSH_ABSOLUTE_JITTER) ?
(brush->jitter_absolute != 0) : (brush->jitter != 0);
/* jitter-ed brush gives weird and unpredictable result for this
* kinds of stroke, so manually disable jitter usage (sergey) */
use_jitter &= (brush->flag & (BRUSH_DRAG_DOT | BRUSH_ANCHORED)) == 0;
if (use_jitter) {
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_v2(rand_pos) > 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;
}
else {
copy_v2_v2(jitterpos, pos);
}
}
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;
externtex(mtex, co, &intensity,
rgba, rgba + 1, rgba + 2, rgba + 3, thread, pool, false, false);
}
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;
externtex(mtex, co, &intensity,
rgba, rgba + 1, rgba + 2, rgba + 3, thread, pool, false, false);
}
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;
}
/* 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, Brush *br,
const float point[3],
float rgba[4], const int thread,
struct ImagePool *pool)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
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 = externtex(mtex, point, &intensity,
rgba, rgba + 1, rgba + 2, rgba + 3, thread, pool, false, false);
}
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 = externtex(mtex, co, &intensity,
rgba, rgba + 1, rgba + 2, rgba + 3, thread, pool, false, false);
}
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 = externtex(mtex, co, &intensity,
rgba, rgba + 1, rgba + 2, rgba + 3, thread, pool, false, false);
}
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;
}
static void brush_painter_2d_refresh_cache(ImagePaintState *s, BrushPainter *painter, const float pos[2], const float mouse[2])
{
const Scene *scene = painter->scene;
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
Brush *brush = painter->brush;
BrushPainterCache *cache = &painter->cache;
const int diameter = 2 * BKE_brush_size_get(scene, brush);
const int size = (cache->size) ? cache->size : diameter;
const float alpha = BKE_brush_alpha_get(scene, brush);
const bool use_masking = painter->cache.use_masking;
bool do_random = false;
bool do_partial_update = false;
bool do_view = false;
float tex_rotation = -brush->mtex.rot;
float mask_rotation = -brush->mask_mtex.rot;
/* determine how can update based on textures used */
if (painter->cache.is_texbrush) {
if (brush->mtex.brush_map_mode == MTEX_MAP_MODE_VIEW) {
do_view = true;
tex_rotation += ups->brush_rotation;
}
else if (brush->mtex.brush_map_mode == MTEX_MAP_MODE_RANDOM)
do_random = true;
else
do_partial_update = true;
brush_painter_2d_tex_mapping(s, size, painter->startpaintpos, pos, mouse,
brush->mtex.brush_map_mode, &painter->tex_mapping);
}
if (painter->cache.is_maskbrush) {
if (brush->mask_mtex.brush_map_mode == MTEX_MAP_MODE_VIEW) {
do_view = true;
mask_rotation += ups->brush_rotation;
}
else if (brush->mask_mtex.brush_map_mode == MTEX_MAP_MODE_RANDOM)
do_random = true;
else
do_partial_update = true;
brush_painter_2d_tex_mapping(s, size, painter->startpaintpos, pos, mouse,
brush->mask_mtex.brush_map_mode, &painter->mask_mapping);
}
if (do_view || do_random)
do_partial_update = false;
painter->pool = BKE_image_pool_new();
/* detect if we need to recreate image brush buffer */
if (diameter != cache->lastsize ||
alpha != cache->lastalpha ||
brush->jitter != cache->lastjitter ||
tex_rotation != cache->last_tex_rotation ||
mask_rotation != cache->last_mask_rotation ||
do_random)
{
if (cache->ibuf) {
IMB_freeImBuf(cache->ibuf);
cache->ibuf = NULL;
}
if (cache->mask) {
MEM_freeN(cache->mask);
cache->mask = NULL;
}
if (do_partial_update) {
/* do partial update of texture + recreate mask */
cache->mask = brush_painter_mask_new(painter, size);
brush_painter_imbuf_partial_update(painter, pos);
}
else {
/* create brush and mask from scratch */
if (use_masking)
cache->mask = brush_painter_mask_new(painter, size);
cache->ibuf = brush_painter_imbuf_new(painter, size);
}
cache->lastsize = diameter;
cache->lastalpha = alpha;
cache->lastjitter = brush->jitter;
cache->last_tex_rotation = tex_rotation;
cache->last_mask_rotation = mask_rotation;
}
else if (do_partial_update) {
/* do only partial update of texture */
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_imbuf_partial_update(painter, pos);
}
}
BKE_image_pool_free(painter->pool);
painter->pool = NULL;
}
/* create imbuf with brush color */
static ImBuf *brush_painter_imbuf_new(BrushPainter *painter, int size)
{
Scene *scene = painter->scene;
Brush *brush = painter->brush;
rctf tex_mapping = painter->tex_mapping;
rctf mask_mapping = painter->mask_mapping;
struct ImagePool *pool = painter->pool;
bool use_masking = painter->cache.use_masking;
bool use_color_correction = painter->cache.use_color_correction;
bool use_float = painter->cache.use_float;
bool is_texbrush = painter->cache.is_texbrush;
bool is_maskbrush = painter->cache.is_maskbrush;
float alpha = (use_masking) ? 1.0f : BKE_brush_alpha_get(scene, brush);
int radius = BKE_brush_size_get(scene, brush);
int xoff = -size * 0.5f + 0.5f;
int yoff = -size * 0.5f + 0.5f;
int x, y, thread = 0;
float brush_rgb[3];
/* allocate image buffer */
ImBuf *ibuf = IMB_allocImBuf(size, size, 32, (use_float) ? IB_rectfloat : IB_rect);
/* get brush color */
if (brush->imagepaint_tool == PAINT_TOOL_DRAW) {
copy_v3_v3(brush_rgb, brush->rgb);
if (use_color_correction)
srgb_to_linearrgb_v3_v3(brush_rgb, brush_rgb);
}
else {
brush_rgb[0] = 1.0f;
brush_rgb[1] = 1.0f;
brush_rgb[2] = 1.0f;
}
/* fill image buffer */
for (y = 0; y < size; y++) {
for (x = 0; x < size; x++) {
/* sample texture and multiply with brush color */
float texco[3], rgba[4];
if (is_texbrush) {
brush_imbuf_tex_co(&tex_mapping, x, y, texco);
BKE_brush_sample_tex_3D(scene, brush, texco, rgba, thread, pool);
/* TODO(sergey): Support texture paint color space. */
if (!use_float) {
linearrgb_to_srgb_v3_v3(rgba, rgba);
}
mul_v3_v3(rgba, brush_rgb);
}
else {
copy_v3_v3(rgba, brush_rgb);
rgba[3] = 1.0f;
}
if (is_maskbrush) {
brush_imbuf_tex_co(&mask_mapping, x, y, texco);
rgba[3] *= BKE_brush_sample_masktex(scene, brush, texco, thread, pool);
}
/* when not using masking, multiply in falloff and strength */
if (!use_masking) {
float xy[2] = {x + xoff, y + yoff};
float len = len_v2(xy);
rgba[3] *= alpha * BKE_brush_curve_strength_clamp(brush, len, radius);
}
if (use_float) {
/* write to float pixel */
float *dstf = ibuf->rect_float + (y * size + x) * 4;
mul_v3_v3fl(dstf, rgba, rgba[3]); /* premultiply */
dstf[3] = rgba[3];
}
else {
/* write to byte pixel */
unsigned char *dst = (unsigned char *)ibuf->rect + (y * size + x) * 4;
rgb_float_to_uchar(dst, rgba);
dst[3] = FTOCHAR(rgba[3]);
}
}
}
return ibuf;
}
int BKE_brush_painter_paint(BrushPainter *painter, BrushFunc func, const float pos[2], double time, float pressure,
void *user, int use_color_correction)
{
Scene *scene = painter->scene;
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_pressure_apply(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 = BKE_brush_size_get(scene, brush);
/* compute brush spacing adapted to brush radius, spacing may depend
* on pressure, so update it */
brush_pressure_apply(painter, brush, painter->lastpressure);
spacing = max_ff(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_pressure_apply(painter, brush, press);
spacing = max_ff(1.0f, radius) * brush->spacing * 0.01f;
BKE_brush_jitter_pos(scene, 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 {
BKE_brush_jitter_pos(scene, 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_pressure_apply(painter, brush, pressure);
BKE_brush_jitter_pos(scene, 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;
BKE_brush_alpha_set(scene, brush, painter->startalpha);
BKE_brush_size_set(scene, brush, painter->startsize);
brush->jitter = painter->startjitter;
brush->spacing = painter->startspacing;
return totpaintops;
}
static void brush_painter_do_partial(BrushPainter *painter, ImBuf *oldtexibuf,
int x, int y, int w, int h, int xt, int yt,
const float pos[2])
{
Scene *scene = painter->scene;
Brush *brush = painter->brush;
ImBuf *ibuf, *maskibuf, *texibuf;
float *bf, *mf, *tf, *otf = NULL, xoff, yoff, xy[2], rgba[4];
unsigned char *b, *m, *t, *ot = NULL;
int dotexold, origx = x, origy = y;
const int radius = BKE_brush_size_get(painter->scene, 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 = min_ii(w, ibuf->x);
h = min_ii(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) {
copy_v3_v3(tf, otf);
tf[3] = otf[3];
otf += 4;
}
else {
xy[0] = x + xoff;
xy[1] = y + yoff;
BKE_brush_sample_tex(scene, 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 = (unsigned char *)ibuf->rect + (y * ibuf->x + origx) * 4;
t = (unsigned char *)texibuf->rect + (y * texibuf->x + origx) * 4;
m = (unsigned char *)maskibuf->rect + (y * maskibuf->x + origx) * 4;
if (dotexold)
ot = (unsigned 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;
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
rgba_float_to_uchar(t, rgba);
}
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;
}
}
}
}
/* TODO, use define for 'texfall' arg */
void BKE_brush_imbuf_new(const Scene *scene, Brush *brush, short flt, short texfall, int bufsize, ImBuf **outbuf, int use_color_correction)
{
ImBuf *ibuf;
float xy[2], rgba[4], *dstf;
int x, y, rowbytes, xoff, yoff, imbflag;
const int radius = BKE_brush_size_get(scene, brush);
unsigned char *dst, crgb[3];
const float alpha = BKE_brush_alpha_get(scene, 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) {
copy_v3_v3(dstf, brush_rgb);
dstf[3] = alpha * BKE_brush_curve_strength_clamp(brush, len_v2(xy), radius);
}
else if (texfall == 1) {
BKE_brush_sample_tex(scene, brush, xy, dstf, 0);
}
else {
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
mul_v3_v3v3(dstf, rgba, brush_rgb);
dstf[3] = rgba[3] * alpha * BKE_brush_curve_strength_clamp(brush, len_v2(xy), radius);
}
}
}
}
else {
float alpha_f; /* final float alpha to convert to char */
rgb_float_to_uchar(crgb, brush->rgb);
for (y = 0; y < ibuf->y; y++) {
dst = (unsigned 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) {
alpha_f = alpha * BKE_brush_curve_strength(brush, len_v2(xy), radius);
dst[0] = crgb[0];
dst[1] = crgb[1];
dst[2] = crgb[2];
dst[3] = FTOCHAR(alpha_f);
}
else if (texfall == 1) {
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
rgba_float_to_uchar(dst, rgba);
}
else if (texfall == 2) {
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
mul_v3_v3(rgba, brush->rgb);
alpha_f = rgba[3] * alpha * BKE_brush_curve_strength_clamp(brush, len_v2(xy), radius);
rgb_float_to_uchar(dst, rgba);
dst[3] = FTOCHAR(alpha_f);
}
else {
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
alpha_f = rgba[3] * alpha * BKE_brush_curve_strength_clamp(brush, len_v2(xy), radius);
dst[0] = crgb[0];
dst[1] = crgb[1];
dst[2] = crgb[2];
dst[3] = FTOCHAR(alpha_f);
}
}
}
}
*outbuf = ibuf;
}
