static void inline
get_rgba_pixel (void *data,
int img_no,
int x,
int y,
lua_Number pixel[4])
{
Priv *p;
gfloat buf[4];
p = data;
if (img_no == 0)
{
gint i;
if (!p->in_drawable)
return;
gegl_buffer_sample (p->in_drawable, x, y, NULL, buf,
p->rgba_float,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
for (i = 0; i < 4; i++)
pixel[i] = buf[i];
}
else if (img_no == 1)
{
gint i;
if (!p->aux_drawable)
return;
gegl_buffer_sample (p->aux_drawable, x, y, NULL, buf,
p->rgba_float,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
for (i = 0; i < 4; i++)
pixel[i] = buf[i];
}
}
/* Apply the actual transform */
static void
apply_spread (gint x_amount,
gint y_amount,
gint img_width,
gint img_height,
const Babl *format,
GeglBuffer *src,
GeglBuffer *dst,
const GeglRectangle *roi)
{
gfloat *dst_buf;
gint x1, y1; // Noise image
gdouble x, y; // Source Image
GRand *gr = g_rand_new ();
/* Get buffer in which to place dst pixels. */
dst_buf = g_new0 (gfloat, roi->width * roi->height * 4);
for (y1 = 0; y1 < roi->height; y1++) {
for (x1 = 0; x1 < roi->width; x1++) {
calc_sample_coords (x1, y1, x_amount, y_amount, gr, &x, &y);
/* Only displace the pixel if it's within the bounds of the image. */
if (x >= 0 && x < img_width && y >= 0 && y < img_height)
gegl_buffer_sample (src, x, y, NULL, &dst_buf[(y1 * roi->width + x1) * 4], format,
GEGL_SAMPLER_LINEAR, GEGL_ABYSS_NONE);
else /* Else just copy it */
gegl_buffer_sample (src, x1, y1, NULL, &dst_buf[(y1 * roi->width + x1) * 4], format,
GEGL_SAMPLER_LINEAR, GEGL_ABYSS_NONE);
} /* for */
} /* for */
gegl_buffer_sample_cleanup (src);
/* Store dst pixels. */
gegl_buffer_set (dst, roi, 0, format, dst_buf, GEGL_AUTO_ROWSTRIDE);
gegl_buffer_flush(dst);
g_free (dst_buf);
g_rand_free (gr);
}
static void
apply_whirl_pinch (gdouble whirl, gdouble pinch, gdouble radius,
gdouble cen_x, gdouble cen_y,
Babl *format,
GeglBuffer *src,
GeglRectangle *in_boundary,
GeglBuffer *dst,
GeglRectangle *boundary,
const GeglRectangle *roi)
{
gfloat *dst_buf;
gint row, col;
gdouble scale_x, scale_y;
gdouble cx, cy;
/* Get buffer in which to place dst pixels. */
dst_buf = g_new0 (gfloat, roi->width * roi->height * 4);
whirl = whirl * G_PI / 180;
scale_x = 1.0;
scale_y = roi->width / (gdouble) roi->height;
for (row = 0; row < roi->height; row++) {
for (col = 0; col < roi->width; col++) {
calc_undistorted_coords (roi->x + col, roi->y + row,
cen_x, cen_y,
scale_x, scale_y,
whirl, pinch, radius,
&cx, &cy);
gegl_buffer_sample (src, cx, cy, 1.0, &dst_buf[(row * roi->width + col) * 4], format, GEGL_INTERPOLATION_LINEAR);
} /* for */
} /* for */
gegl_buffer_sample_cleanup (src);
/* Store dst pixels. */
gegl_buffer_set (dst, roi, format, dst_buf, GEGL_AUTO_ROWSTRIDE);
gegl_buffer_flush(dst);
g_free (dst_buf);
}
guchar
sel_pixel_value (gint row,
gint col)
{
guchar ret;
if (col > sel_width || row > sel_height)
{
g_warning ("sel_pixel_value [%d,%d] out of bounds", col, row);
return 0;
}
gegl_buffer_sample (sel_buffer, col + sel_x1, row + sel_y1, NULL,
&ret, babl_format ("Y u8"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
return ret;
}
static GimpVector2
gimp_cage_transform_compute_destination (GimpCageConfig *config,
gfloat *coef,
Babl *format_coef,
GeglBuffer *coef_buf,
GimpVector2 coords)
{
gdouble pos_x, pos_y;
GimpVector2 result;
gint cvn = config->n_cage_vertices;
gint i;
/* When Gegl bug #645810 will be solved, this should be a good optimisation */
#ifdef GEGL_BUG_645810_SOLVED
gegl_buffer_sample (coef_buf, coords.x, coords.y, 1.0, coef, format_coef, GEGL_INTERPOLATION_LANCZOS);
#else
GeglRectangle rect;
rect.height = 1;
rect.width = 1;
rect.x = coords.x;
rect.y = coords.y;
gegl_buffer_get (coef_buf, 1, &rect, format_coef, coef, GEGL_AUTO_ROWSTRIDE);
#endif
pos_x = 0;
pos_y = 0;
for (i = 0; i < cvn; i++)
{
pos_x += coef[i] * config->cage_points[i].dest_point.x;
pos_y += coef[i] * config->cage_points[i].dest_point.y;
pos_x += coef[i + cvn] * config->cage_points[i].edge_scaling_factor * config->cage_points[i].edge_normal.x;
pos_y += coef[i + cvn] * config->cage_points[i].edge_scaling_factor * config->cage_points[i].edge_normal.y;
}
result.x = pos_x;
result.y = pos_y;
return result;
}
static gboolean
gimp_projection_get_pixel_at (GimpPickable *pickable,
gint x,
gint y,
const Babl *format,
gpointer pixel)
{
GeglBuffer *buffer = gimp_projection_get_buffer (pickable);
if (x < 0 ||
y < 0 ||
x >= gegl_buffer_get_width (buffer) ||
y >= gegl_buffer_get_height (buffer))
return FALSE;
gegl_buffer_sample (buffer, x, y, NULL, pixel, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
return TRUE;
}
static GimpVector2
gimp_cage_transform_compute_destination (GimpCageConfig *config,
gfloat *coef,
const Babl *format_coef,
GeglBuffer *coef_buf,
GimpVector2 coords)
{
GimpVector2 result = {0, 0};
gint n_cage_vertices = gimp_cage_config_get_n_points (config);
gint i;
GimpCagePoint *point;
/* When Gegl bug #645810 will be solved, this should be a good optimisation */
#ifdef GEGL_BUG_645810_SOLVED
gegl_buffer_sample (coef_buf, coords.x, coords.y, 1.0, coef, format_coef, GEGL_INTERPOLATION_NEAREST);
#else
GeglRectangle rect;
rect.height = 1;
rect.width = 1;
rect.x = coords.x;
rect.y = coords.y;
gegl_buffer_get (coef_buf, &rect, 1.0, format_coef, coef,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
#endif
for (i = 0; i < n_cage_vertices; i++)
{
point = &g_array_index (config->cage_points, GimpCagePoint, i);
result.x += coef[i] * point->dest_point.x;
result.y += coef[i] * point->dest_point.y;
result.x += coef[i + n_cage_vertices] * point->edge_scaling_factor * point->edge_normal.x;
result.y += coef[i + n_cage_vertices] * point->edge_scaling_factor * point->edge_normal.y;
}
return result;
}
static gboolean
do_plasma (PlasmaContext *context,
gint x1,
gint y1,
gint x2,
gint y2,
gint plasma_depth,
gint recursion_depth)
{
gfloat tl[3], ml[3], bl[3], mt[3], mm[3], mb[3], tr[3], mr[3], br[3];
gfloat tmp[3];
gint xm, ym;
gfloat ran;
if (G_UNLIKELY ((!context->using_buffer) &&
((x2 - x1 + 1) <= TILE_SIZE) &&
((y2 - y1 + 1) <= TILE_SIZE)))
{
gboolean ret;
GeglRectangle rect;
rect.x = x1;
rect.y = y1;
rect.width = x2 - x1 + 1;
rect.height = y2 - y1 + 1;
gegl_buffer_get (context->output, &rect, 1.0, babl_format ("R'G'B' float"),
context->buffer, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
context->using_buffer = TRUE;
context->buffer_x = x1;
context->buffer_y = y1;
context->buffer_width = x2 - x1 + 1;
ret = do_plasma (context, x1, y1, x2, y2, plasma_depth, recursion_depth);
context->using_buffer = FALSE;
gegl_buffer_set (context->output, &rect, 0, babl_format ("R'G'B' float"),
context->buffer, GEGL_AUTO_ROWSTRIDE);
return ret;
}
xm = (x1 + x2) / 2;
ym = (y1 + y2) / 2;
if (plasma_depth == -1)
{
random_rgba (context->gr, tl);
put_pixel (context, tl, x1, y1);
random_rgba (context->gr, tr);
put_pixel (context, tr, x2, y1);
random_rgba (context->gr, bl);
put_pixel (context, bl, x1, y2);
random_rgba (context->gr, br);
put_pixel (context, br, x2, y2);
random_rgba (context->gr, mm);
put_pixel (context, mm, xm, ym);
random_rgba (context->gr, ml);
put_pixel (context, ml, x1, ym);
random_rgba (context->gr, mr);
put_pixel (context, mr, x2, ym);
random_rgba (context->gr, mt);
put_pixel (context, mt, xm, y1);
random_rgba (context->gr, mb);
put_pixel (context, mb, xm, y2);
return FALSE;
}
if (!plasma_depth)
{
if (x1 == x2 && y1 == y2)
return FALSE;
gegl_buffer_sample (context->output, x1, y1, NULL, tl,
babl_format ("R'G'B' float"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
gegl_buffer_sample (context->output, x1, y2, NULL, bl,
babl_format ("R'G'B' float"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
gegl_buffer_sample (context->output, x2, y1, NULL, tr,
babl_format ("R'G'B' float"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
gegl_buffer_sample (context->output, x2, y2, NULL, br,
babl_format ("R'G'B' float"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
ran = context->o->turbulence / (2.0 * recursion_depth);
if (xm != x1 || xm != x2)
{
/* Left. */
average_pixel (ml, tl, bl);
add_random (context->gr, ml, ran);
put_pixel (context, ml, x1, ym);
/* Right. */
if (x1 != x2)
{
average_pixel (mr, tr, br);
add_random (context->gr, mr, ran);
put_pixel (context, mr, x2, ym);
}
}
if (ym != y1 || ym != x2)
{
/* Bottom. */
if (x1 != xm || ym != y2)
{
average_pixel (mb, bl, br);
add_random (context->gr, mb, ran);
put_pixel (context, mb, xm, y2);
}
if (y1 != y2)
{
/* Top. */
average_pixel (mt, tl, tr);
add_random (context->gr, mt, ran);
put_pixel (context, mt, xm, y1);
}
}
if (y1 != y2 || x1 != x2)
{
/* Middle pixel. */
average_pixel (mm, tl, br);
average_pixel (tmp, bl, tr);
average_pixel (mm, mm, tmp);
add_random (context->gr, mm, ran);
put_pixel (context, mm, xm, ym);
}
return x2 - x1 < 3 && y2 - y1 < 3;
}
if (x1 < x2 || y1 < y2)
{
/* Top left. */
do_plasma (context, x1, y1, xm, ym, plasma_depth - 1, recursion_depth + 1);
/* Bottom left. */
do_plasma (context, x1, ym, xm, y2, plasma_depth - 1, recursion_depth + 1);
/* Top right. */
do_plasma (context, xm, y1, x2, ym, plasma_depth - 1, recursion_depth + 1);
/* Bottom right. */
return do_plasma (context, xm, ym, x2, y2,
plasma_depth - 1, recursion_depth + 1);
}
return TRUE;
}
static gboolean
find_contiguous_segment (const gfloat *col,
GeglBuffer *src_buffer,
GeglBuffer *mask_buffer,
const Babl *format,
gint n_components,
gboolean has_alpha,
gint width,
gboolean select_transparent,
GimpSelectCriterion select_criterion,
gboolean antialias,
gfloat threshold,
gint initial_x,
gint initial_y,
gint *start,
gint *end,
gfloat *row)
{
gfloat *s;
gfloat mask_row[width];
gfloat diff;
#ifdef FETCH_ROW
gegl_buffer_get (src_buffer, GEGL_RECTANGLE (0, initial_y, width, 1), 1.0,
format,
row, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
s = row + initial_x * n_components;
#else
s = g_alloca (n_components * sizeof (gfloat));
gegl_buffer_sample (src_buffer, initial_x, initial_y, NULL, s, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
#endif
diff = pixel_difference (col, s, antialias, threshold,
n_components, has_alpha, select_transparent,
select_criterion);
/* check the starting pixel */
if (! diff)
return FALSE;
mask_row[initial_x] = diff;
*start = initial_x - 1;
#ifdef FETCH_ROW
s = row + *start * n_components;
#endif
while (*start >= 0 && diff)
{
#ifndef FETCH_ROW
gegl_buffer_sample (src_buffer, *start, initial_y, NULL, s, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
#endif
diff = pixel_difference (col, s, antialias, threshold,
n_components, has_alpha, select_transparent,
select_criterion);
mask_row[*start] = diff;
if (diff)
{
(*start)--;
#ifdef FETCH_ROW
s -= n_components;
#endif
}
}
diff = 1;
*end = initial_x + 1;
#ifdef FETCH_ROW
s = row + *end * n_components;
#endif
while (*end < width && diff)
{
#ifndef FETCH_ROW
gegl_buffer_sample (src_buffer, *end, initial_y, NULL, s, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
#endif
diff = pixel_difference (col, s, antialias, threshold,
n_components, has_alpha, select_transparent,
select_criterion);
mask_row[*end] = diff;
if (diff)
{
(*end)++;
#ifdef FETCH_ROW
s += n_components;
#endif
}
}
gegl_buffer_set (mask_buffer, GEGL_RECTANGLE (*start, initial_y,
*end - *start, 1),
0, babl_format ("Y float"), &mask_row[*start],
GEGL_AUTO_ROWSTRIDE);
return TRUE;
}
/**
* gimp_drawable_get_line_art_fill_buffer:
* @drawable: the #GimpDrawable to edit.
* @line_art: the #GimpLineArt computed as fill source.
* @options: the #GimpFillOptions.
* @sample_merged:
* @seed_x: X coordinate to start the fill.
* @seed_y: Y coordinate to start the fill.
* @mask_buffer: mask of the fill in-progress when in an interactive
* filling process. Set to NULL if you need a one-time
* fill.
* @mask_x: returned x bound of @mask_buffer.
* @mask_y: returned x bound of @mask_buffer.
* @mask_width: returned width bound of @mask_buffer.
* @mask_height: returned height bound of @mask_buffer.
*
* Creates the fill buffer for a bucket fill operation on @drawable
* based on @line_art and @options, without actually applying it.
* If @mask_buffer is not NULL, the intermediate fill mask will also be
* returned. This fill mask can later be reused in successive calls to
* gimp_drawable_get_bucket_fill_buffer() for interactive filling.
*
* Returns: a fill buffer which can be directly applied to @drawable, or
* used in a drawable filter as preview.
*/
GeglBuffer *
gimp_drawable_get_line_art_fill_buffer (GimpDrawable *drawable,
GimpLineArt *line_art,
GimpFillOptions *options,
gboolean sample_merged,
gdouble seed_x,
gdouble seed_y,
GeglBuffer **mask_buffer,
gdouble *mask_x,
gdouble *mask_y,
gint *mask_width,
gint *mask_height)
{
GimpImage *image;
GeglBuffer *buffer;
GeglBuffer *new_mask;
gint x, y, width, height;
gint mask_offset_x = 0;
gint mask_offset_y = 0;
gint sel_x, sel_y, sel_width, sel_height;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_FILL_OPTIONS (options), NULL);
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (! gimp_item_mask_intersect (GIMP_ITEM (drawable),
&sel_x, &sel_y, &sel_width, &sel_height))
return NULL;
if (mask_buffer && *mask_buffer)
{
gfloat pixel;
gegl_buffer_sample (*mask_buffer, seed_x, seed_y, NULL, &pixel,
babl_format ("Y float"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
if (pixel != 0.0)
/* Already selected. This seed won't change the selection. */
return NULL;
}
gimp_set_busy (image->gimp);
/* Do a seed bucket fill...To do this, calculate a new
* contiguous region.
*/
new_mask = gimp_pickable_contiguous_region_by_line_art (NULL, line_art,
(gint) seed_x,
(gint) seed_y);
if (mask_buffer && *mask_buffer)
{
gimp_gegl_mask_combine_buffer (new_mask, *mask_buffer,
GIMP_CHANNEL_OP_ADD, 0, 0);
g_object_unref (*mask_buffer);
}
if (mask_buffer)
*mask_buffer = new_mask;
gimp_gegl_mask_bounds (new_mask, &x, &y, &width, &height);
width -= x;
height -= y;
/* If there is a selection, intersect the region bounds
* with the selection bounds, to avoid processing areas
* that are going to be masked out anyway. The actual
* intersection of the fill region with the mask data
* happens when combining the fill buffer, in
* gimp_drawable_apply_buffer().
*/
if (! gimp_channel_is_empty (gimp_image_get_mask (image)))
{
gint off_x = 0;
gint off_y = 0;
if (sample_merged)
gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
if (! gimp_rectangle_intersect (x, y, width, height,
sel_x + off_x, sel_y + off_y,
sel_width, sel_height,
&x, &y, &width, &height))
{
if (! mask_buffer)
g_object_unref (new_mask);
/* The fill region and the selection are disjoint; bail. */
gimp_unset_busy (image->gimp);
return NULL;
}
}
/* make sure we handle the mask correctly if it was sample-merged */
if (sample_merged)
{
GimpItem *item = GIMP_ITEM (drawable);
gint off_x, off_y;
/* Limit the channel bounds to the drawable's extents */
gimp_item_get_offset (item, &off_x, &off_y);
gimp_rectangle_intersect (x, y, width, height,
off_x, off_y,
gimp_item_get_width (item),
gimp_item_get_height (item),
&x, &y, &width, &height);
mask_offset_x = x;
mask_offset_y = y;
/* translate mask bounds to drawable coords */
x -= off_x;
y -= off_y;
}
else
{
mask_offset_x = x;
mask_offset_y = y;
}
buffer = gimp_fill_options_create_buffer (options, drawable,
GEGL_RECTANGLE (0, 0,
width, height),
-x, -y);
gimp_gegl_apply_opacity (buffer, NULL, NULL, buffer, new_mask,
-mask_offset_x, -mask_offset_y, 1.0);
if (gimp_fill_options_get_antialias (options))
{
/* Antialias for the line art algorithm is not applied during mask
* creation because it is not based on individual pixel colors.
* Instead we just want to apply it on the borders of the mask at
* the end (since the mask can evolve, we don't want to actually
* touch it, but only the intermediate results).
*/
GeglNode *graph;
GeglNode *input;
GeglNode *op;
graph = gegl_node_new ();
input = gegl_node_new_child (graph,
"operation", "gegl:buffer-source",
"buffer", buffer,
NULL);
op = gegl_node_new_child (graph,
"operation", "gegl:gaussian-blur",
"std-dev-x", 0.5,
"std-dev-y", 0.5,
NULL);
gegl_node_connect_to (input, "output", op, "input");
gegl_node_blit_buffer (op, buffer, NULL, 0,
GEGL_ABYSS_NONE);
g_object_unref (graph);
}
if (mask_x)
*mask_x = x;
if (mask_y)
*mask_y = y;
if (mask_width)
*mask_width = width;
if (mask_height)
*mask_height = height;
if (! mask_buffer)
g_object_unref (new_mask);
gimp_unset_busy (image->gimp);
return buffer;
}
static void
convolve_pixel(gfloat *src_buf,
gfloat *dst_buf,
const GeglRectangle *result,
const GeglRectangle *extended,
const GeglRectangle *boundary,
gdouble **matrix,
GeglChantO *o,
GeglBuffer *input,
gint xx,
gint yy,
gdouble matrixsum)
{
gint i, x, y, temp, s_x, s_y;
gdouble sum;
gfloat color[4];
gint d_offset, s_offset;
gint half;
gdouble alphasum = 0.0;
s_x = 0;
s_y = 0;
half = (MATRIX_SIZE / 2) + (MATRIX_SIZE % 2);
d_offset = ((yy - result->y)*result->width * 4) + (xx - result->x) * 4;
s_offset = (yy - result->y + HALF_WINDOW) * extended->width * 4 +
(xx - result->x + HALF_WINDOW) * 4;
for (i=0; i < 4; i++)
{
sum = 0.0;
if ((i==0 && o->red) || (i==1 && o->blue) || (i==2 && o->green)
|| (i==3 && o->alpha))
{
for (x=0;x < MATRIX_SIZE; x++)
for (y=0; y < MATRIX_SIZE; y++)
{
if (!strcmp(o->border,"wrap"))
{
s_x = fmod (x+xx, boundary->width);
while (s_x < 0)
s_x +=boundary->width;
s_y = fmod (y+yy, boundary->height);
while (s_y < 0)
s_y +=boundary->width;
}
else if (!strcmp(o->border,"extend"))
{
s_x = CLAMP (x+xx, 0, boundary->width);
s_y = CLAMP (y+yy, 0, boundary->height);
}
temp = (s_y - extended->y) * extended->width * 4 +
(s_x - extended->x) * 4;
if ((s_x >= extended->x && (s_x < extended->x + extended->width))
&& (s_y >=extended->y && (s_y < extended->y + extended->height)))
{
if (i!=3 && o->weight)
sum += matrix[x][y] * src_buf[temp + i]
* src_buf[temp + 3];
else
sum += matrix[x][y] * src_buf[temp + i];
if (i==3)
alphasum += fabs (matrix[x][y] * src_buf[temp+i]);
}
else
{
gfloat temp_color[4];
gegl_buffer_sample (input, s_x, s_y, NULL, temp_color,
babl_format ("RGBA float"),
GEGL_SAMPLER_NEAREST,
GEGL_ABYSS_NONE);
if (i!=3 && o->weight)
sum += matrix[x][y] * temp_color[i]
* temp_color[3];
else
sum += matrix[x][y] * temp_color[i];
if (i==3)
alphasum += fabs (matrix[x][y] * temp_color[i]);
}
}
sum = sum / o->div;
if (i==3 && o->weight)
{
if (alphasum != 0)
sum = sum * matrixsum / alphasum;
else sum = 0.0;
}
sum += o->off;
color[i] = sum;
}
else
color[i] = src_buf[s_offset + i];
}
for (i=0; i < 4; i++)
dst_buf[d_offset + i] = color[i];
}
static void
lens_distort_func (gfloat *src_buf,
gfloat *dst_buf,
const GeglRectangle *extended,
const GeglRectangle *result,
const GeglRectangle *boundary,
LensValues *lens,
gint xx,
gint yy,
GeglBuffer *input,
gfloat *background)
{
gdouble sx, sy, mag;
gdouble brighten;
gfloat pixel_buffer [16 * 4], temp[4];
gdouble dx, dy;
gint x_int, y_int, x = 0, y = 0, offset = 0;
temp[0] = temp[1] = temp[2] = temp[3] = 0.0;
lens_get_source_coord ((gdouble) xx, (gdouble) yy, &sx, &sy, &mag, lens);
/* pseudo gamma transformation, since the input is scRGB */
brighten = pow (MAX (1.0 + mag * lens->brighten, 0.0), 2.4);
x_int = floor (sx);
dx = sx - x_int;
y_int = floor (sy);
dy = sy - y_int;
for (y = y_int - 1; y <= y_int + 2; y++)
{
for (x = x_int - 1; x <= x_int + 2; x++)
{
gint b;
if (x < boundary->x || x >= (boundary->x + boundary->width) ||
y < boundary->y || y >= (boundary->y + boundary->height))
{
for (b = 0; b < 4; b++)
pixel_buffer[offset++] = background[b];
}
else
{
if (x >= extended->x && x < (extended->x + extended->width) &&
y >= extended->y && y < (extended->y + extended->height))
{
gint src_off;
src_off = (y - extended->y) * extended->width * 4 +
(x - extended->x) * 4;
for (b = 0; b < 4; b++)
temp[b] = src_buf[src_off++];
}
else
{
gegl_buffer_sample (input, x, y, NULL, temp,
babl_format ("RGBA float"),
GEGL_SAMPLER_LINEAR,
GEGL_ABYSS_CLAMP);
}
for (b = 0; b < 4; b++)
pixel_buffer[offset++] = temp[b];
}
}
}
lens_cubic_interpolate (pixel_buffer, temp, dx, dy, brighten);
offset = (yy - result->y) * result->width * 4 + (xx - result->x) * 4;
for (x = 0; x < 4; x++)
dst_buf[offset++] = temp[x];
}
/**
* gimp_drawable_get_bucket_fill_buffer:
* @drawable: the #GimpDrawable to edit.
* @options:
* @fill_transparent:
* @fill_criterion:
* @threshold:
* @sample_merged:
* @diagonal_neighbors:
* @seed_x: X coordinate to start the fill.
* @seed_y: Y coordinate to start the fill.
* @mask_buffer: mask of the fill in-progress when in an interactive
* filling process. Set to NULL if you need a one-time
* fill.
* @mask_x: returned x bound of @mask_buffer.
* @mask_y: returned x bound of @mask_buffer.
* @mask_width: returned width bound of @mask_buffer.
* @mask_height: returned height bound of @mask_buffer.
*
* Creates the fill buffer for a bucket fill operation on @drawable,
* without actually applying it (if you want to apply it directly as a
* one-time operation, use gimp_drawable_bucket_fill() instead). If
* @mask_buffer is not NULL, the intermediate fill mask will also be
* returned. This fill mask can later be reused in successive calls to
* gimp_drawable_get_bucket_fill_buffer() for interactive filling.
*
* Returns: a fill buffer which can be directly applied to @drawable, or
* used in a drawable filter as preview.
*/
GeglBuffer *
gimp_drawable_get_bucket_fill_buffer (GimpDrawable *drawable,
GimpFillOptions *options,
gboolean fill_transparent,
GimpSelectCriterion fill_criterion,
gdouble threshold,
gboolean sample_merged,
gboolean diagonal_neighbors,
gdouble seed_x,
gdouble seed_y,
GeglBuffer **mask_buffer,
gdouble *mask_x,
gdouble *mask_y,
gint *mask_width,
gint *mask_height)
{
GimpImage *image;
GimpPickable *pickable;
GeglBuffer *buffer;
GeglBuffer *new_mask;
gboolean antialias;
gint x, y, width, height;
gint mask_offset_x = 0;
gint mask_offset_y = 0;
gint sel_x, sel_y, sel_width, sel_height;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_FILL_OPTIONS (options), NULL);
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (! gimp_item_mask_intersect (GIMP_ITEM (drawable),
&sel_x, &sel_y, &sel_width, &sel_height))
return NULL;
if (mask_buffer && *mask_buffer && threshold == 0.0)
{
gfloat pixel;
gegl_buffer_sample (*mask_buffer, seed_x, seed_y, NULL, &pixel,
babl_format ("Y float"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
if (pixel != 0.0)
/* Already selected. This seed won't change the selection. */
return NULL;
}
gimp_set_busy (image->gimp);
if (sample_merged)
pickable = GIMP_PICKABLE (image);
else
pickable = GIMP_PICKABLE (drawable);
antialias = gimp_fill_options_get_antialias (options);
/* Do a seed bucket fill...To do this, calculate a new
* contiguous region.
*/
new_mask = gimp_pickable_contiguous_region_by_seed (pickable,
antialias,
threshold,
fill_transparent,
fill_criterion,
diagonal_neighbors,
(gint) seed_x,
(gint) seed_y);
if (mask_buffer && *mask_buffer)
{
gimp_gegl_mask_combine_buffer (new_mask, *mask_buffer,
GIMP_CHANNEL_OP_ADD, 0, 0);
g_object_unref (*mask_buffer);
}
if (mask_buffer)
*mask_buffer = new_mask;
gimp_gegl_mask_bounds (new_mask, &x, &y, &width, &height);
width -= x;
height -= y;
/* If there is a selection, intersect the region bounds
* with the selection bounds, to avoid processing areas
* that are going to be masked out anyway. The actual
* intersection of the fill region with the mask data
* happens when combining the fill buffer, in
* gimp_drawable_apply_buffer().
*/
if (! gimp_channel_is_empty (gimp_image_get_mask (image)))
{
gint off_x = 0;
gint off_y = 0;
if (sample_merged)
gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
if (! gimp_rectangle_intersect (x, y, width, height,
sel_x + off_x, sel_y + off_y,
sel_width, sel_height,
&x, &y, &width, &height))
{
if (! mask_buffer)
g_object_unref (new_mask);
/* The fill region and the selection are disjoint; bail. */
gimp_unset_busy (image->gimp);
return NULL;
}
}
/* make sure we handle the mask correctly if it was sample-merged */
if (sample_merged)
{
GimpItem *item = GIMP_ITEM (drawable);
gint off_x, off_y;
/* Limit the channel bounds to the drawable's extents */
gimp_item_get_offset (item, &off_x, &off_y);
gimp_rectangle_intersect (x, y, width, height,
off_x, off_y,
gimp_item_get_width (item),
gimp_item_get_height (item),
&x, &y, &width, &height);
mask_offset_x = x;
mask_offset_y = y;
/* translate mask bounds to drawable coords */
x -= off_x;
y -= off_y;
}
else
{
mask_offset_x = x;
mask_offset_y = y;
}
buffer = gimp_fill_options_create_buffer (options, drawable,
GEGL_RECTANGLE (0, 0,
width, height),
-x, -y);
gimp_gegl_apply_opacity (buffer, NULL, NULL, buffer, new_mask,
-mask_offset_x, -mask_offset_y, 1.0);
if (mask_x)
*mask_x = x;
if (mask_y)
*mask_y = y;
if (mask_width)
*mask_width = width;
if (mask_height)
*mask_height = height;
if (! mask_buffer)
g_object_unref (new_mask);
gimp_unset_busy (image->gimp);
return buffer;
}
static void
fractaltrace (GeglBuffer *input,
const GeglRectangle *picture,
gfloat *dst_buf,
const GeglRectangle *roi,
GeglChantO *o,
gint y,
GeglFractalTraceType fractal_type,
const Babl *format)
{
GeglMatrix2 scale; /* a matrix indicating scaling factors around the
current center pixel.
*/
gint x, i, offset;
gdouble scale_x, scale_y;
gdouble bailout2;
gfloat dest[4];
scale_x = (o->X2 - o->X1) / picture->width;
scale_y = (o->Y2 - o->Y1) / picture->height;
bailout2 = o->bailout * o->bailout;
offset = (y - roi->y) * roi->width * 4;
for (x = roi->x; x < roi->x + roi->width; x++)
{
gdouble cx, cy;
gdouble px, py;
dest[1] = dest[2] = dest[3] = dest[0] = 0.0;
switch (fractal_type)
{
case GEGL_FRACTAL_TRACE_TYPE_JULIA:
#define gegl_unmap(u,v,ud,vd) { \
gdouble rx, ry; \
cx = o->X1 + ((u) - picture->x) * scale_x; \
cy = o->Y1 + ((v) - picture->y) * scale_y; \
julia (cx, cy, o->JX, o->JY, &rx, &ry, o->depth, bailout2); \
ud = (rx - o->X1) / scale_x + picture->x; \
vd = (ry - o->Y1) / scale_y + picture->y; \
}
gegl_sampler_compute_scale (scale, x, y);
gegl_unmap(x,y,px,py);
#undef gegl_unmap
break;
case GEGL_FRACTAL_TRACE_TYPE_MANDELBROT:
#define gegl_unmap(u,v,ud,vd) { \
gdouble rx, ry; \
cx = o->X1 + ((u) - picture->x) * scale_x; \
cy = o->Y1 + ((v) - picture->y) * scale_y; \
julia (cx, cy, cx, cy, &rx, &ry, o->depth, bailout2); \
ud = (rx - o->X1) / scale_x + picture->x; \
vd = (ry - o->Y1) / scale_y + picture->y; \
}
gegl_sampler_compute_scale (scale, x, y);
gegl_unmap(x,y,px,py);
#undef gegl_unmap
break;
default:
g_error (_("Unsupported fractal type"));
}
gegl_buffer_sample (input, px, py, &scale, dest, format,
GEGL_SAMPLER_NOHALO, o->abyss_policy);
for (i = 0; i < 4; i++)
dst_buf[offset++] = dest[i];
}
}
static void
lens_distort_func (gfloat *src_buf,
gfloat *dst_buf,
const GeglRectangle *extended,
const GeglRectangle *result,
const GeglRectangle *boundary,
LensDistortion old,
gint xx,
gint yy,
GeglBuffer *input)
{
gdouble sx, sy, mag;
gdouble brighten;
gfloat pixel_buffer [16 * 4], temp[4];
gdouble dx, dy;
gint x_int, y_int, x = 0, y = 0, offset = 0;
temp[0] = temp[1] = temp[2] = temp[3] = 0.0;
lens_get_source_coord ((gdouble)xx, (gdouble)yy, &sx, &sy, &mag, &old);
brighten = 1.0 + mag * old.brighten;
x_int = floor (sx);
dx = sx - x_int;
y_int = floor (sy);
dy = sy - y_int;
for (y = y_int - 1; y <= y_int + 2; y++)
{
for (x = x_int - 1; x <= x_int + 2; x++)
{
gint b;
if (x >= extended->x && x<(extended->x + extended->width)
&& y >= extended->y && y < (extended->y + extended->height))
{
gint src_off;
src_off = (y - extended->y) * extended->width * 4 +
(x - extended->x) * 4;
for (b=0; b<4; b++)
temp[b] = src_buf[src_off++];
}
else if (x >= boundary->x && x < boundary->x + boundary->width &&
y >= boundary->y && y < boundary->y + boundary->height)
{
gegl_buffer_sample (input, x, y, NULL, temp,
babl_format ("RGBA float"),
GEGL_SAMPLER_CUBIC,
GEGL_ABYSS_NONE);
}
else
{
for (b=0; b<4; b++)
temp[b] = 0.0;
}
for (b=0; b<4; b++)
pixel_buffer[offset++] = temp[b];
}
}
lens_cubic_interpolate (pixel_buffer, temp, dx, dy, brighten);
offset = (yy - result->y) * result->width * 4 + (xx - result->x) * 4;
for (x=0; x<4; x++)
dst_buf[offset++] = temp[x];
}
static gboolean
save_image (const gchar *filename,
GeglBuffer *buffer,
GError **error)
{
const Babl *format = babl_format ("R'G'B'A u8");
gint row, col, cols, rows, x, y;
gint colcount, colspan, rowspan;
gint *palloc;
guchar *buf, *buf2;
gchar *width, *height;
FILE *fp;
cols = gegl_buffer_get_width (buffer);
rows = gegl_buffer_get_height (buffer);
fp = g_fopen (filename, "w");
if (! fp)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for writing: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
return FALSE;
}
palloc = g_new (int, rows * cols);
if (gtmvals.fulldoc)
{
fprintf (fp, "<HTML>\n<HEAD><TITLE>%s</TITLE></HEAD>\n<BODY>\n",
filename);
fprintf (fp, "<H1>%s</H1>\n",
filename);
}
fprintf (fp, "<TABLE BORDER=%d CELLPADDING=%d CELLSPACING=%d>\n",
gtmvals.border, gtmvals.cellpadding, gtmvals.cellspacing);
if (gtmvals.caption)
fprintf (fp, "<CAPTION>%s</CAPTION>\n",
gtmvals.captiontxt);
gimp_progress_init_printf (_("Saving '%s'"),
gimp_filename_to_utf8 (filename));
buf = g_new (guchar, babl_format_get_bytes_per_pixel (format));
buf2 = g_new (guchar, babl_format_get_bytes_per_pixel (format));
width = height = NULL;
if (strcmp (gtmvals.clwidth, "") != 0)
{
width = g_strdup_printf (" WIDTH=\"%s\"", gtmvals.clwidth);
}
if (strcmp (gtmvals.clheight, "") != 0)
{
height = g_strdup_printf (" HEIGHT=\"%s\" ", gtmvals.clheight);
}
if (! width)
width = g_strdup (" ");
if (! height)
height = g_strdup (" ");
/* Initialize array to hold ROWSPAN and COLSPAN cell allocation table */
for (row = 0; row < rows; row++)
for (col = 0; col < cols; col++)
palloc[cols * row + col] = 1;
colspan = 0;
rowspan = 0;
for (y = 0; y < rows; y++)
{
fprintf (fp," <TR>\n");
for (x = 0; x < cols; x++)
{
gegl_buffer_sample (buffer, x, y, NULL, buf, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
/* Determine ROWSPAN and COLSPAN */
if (gtmvals.spantags)
{
col = x;
row = y;
colcount = 0;
colspan = 0;
rowspan = 0;
gegl_buffer_sample (buffer, col, row, NULL, buf2, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
while (color_comp (buf, buf2) &&
palloc[cols * row + col] == 1 &&
row < rows)
{
while (color_comp (buf, buf2) &&
palloc[cols * row + col] == 1 &&
col < cols)
{
colcount++;
col++;
gegl_buffer_sample (buffer, col, row, NULL, buf2, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
}
if (colcount != 0)
{
row++;
rowspan++;
}
if (colcount < colspan || colspan == 0)
colspan = colcount;
col = x;
colcount = 0;
gegl_buffer_sample (buffer, col, row, NULL, buf2, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
}
if (colspan > 1 || rowspan > 1)
{
for (row = 0; row < rowspan; row++)
for (col = 0; col < colspan; col++)
palloc[cols * (row + y) + (col + x)] = 0;
palloc[cols * y + x] = 2;
}
}
if (palloc[cols * y + x] == 1)
fprintf (fp, " <TD%s%sBGCOLOR=#%02x%02x%02x>",
width, height, buf[0], buf[1], buf[2]);
if (palloc[cols * y + x] == 2)
fprintf (fp," <TD ROWSPAN=\"%d\" COLSPAN=\"%d\"%s%sBGCOLOR=#%02x%02x%02x>",
rowspan, colspan, width, height,
buf[0], buf[1], buf[2]);
if (palloc[cols * y + x] != 0)
{
if (gtmvals.tdcomp)
fprintf (fp, "%s</TD>\n", gtmvals.cellcontent);
else
fprintf (fp, "\n %s\n </TD>\n", gtmvals.cellcontent);
}
}
fprintf (fp," </TR>\n");
gimp_progress_update ((double) y / (double) rows);
}
gimp_progress_update (1.0);
if (gtmvals.fulldoc)
fprintf (fp, "</TABLE></BODY></HTML>\n");
else
fprintf (fp, "</TABLE>\n");
fclose (fp);
g_free (width);
g_free (height);
g_free (palloc);
return TRUE;
}
static gboolean
process (GeglOperation *operation,
GeglBuffer *input,
GeglBuffer *output,
const GeglRectangle *result,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
GeglOperationAreaFilter *op_area = GEGL_OPERATION_AREA_FILTER (operation);
GeglRectangle boundary = get_effective_area (operation);
GeglRectangle extended;
const Babl *format = babl_format ("RGBA float");
GRand *gr = g_rand_new_with_seed (o->seed);
gfloat color[4];
gint cols, rows, num_tiles, count;
gint *random_indices;
gfloat *dst_buf;
Polygon poly;
gint i;
extended.x = CLAMP (result->x - op_area->left, boundary.x, boundary.x +
boundary.width);
extended.width = CLAMP (result->width + op_area->left + op_area->right, 0,
boundary.width);
extended.y = CLAMP (result->y - op_area->top, boundary.y, boundary.y +
boundary.width);
extended.height = CLAMP (result->height + op_area->top + op_area->bottom, 0,
boundary.height);
dst_buf = g_new0 (gfloat, extended.width * extended.height * 4);
cols = (result->width + o->tile_size - 1) / o->tile_size;
rows = (result->height + o->tile_size - 1) / o->tile_size;
num_tiles = (rows + 1) * (cols + 1);
random_indices = g_new0 (gint, num_tiles);
for (i = 0; i < num_tiles; i++)
random_indices[i] = i;
randomize_indices (num_tiles, random_indices, gr);
for (count = 0; count < num_tiles; count++)
{
gint i, j, ix, iy;
gdouble x, y, width, height, theta;
i = random_indices[count] / (cols + 1);
j = random_indices[count] % (cols + 1);
x = j * o->tile_size + (o->tile_size / 4.0)
- g_rand_double_range (gr, 0, (o->tile_size /2.0)) + result->x;
y = i * o->tile_size + (o->tile_size / 4.0)
- g_rand_double_range (gr, 0, (o->tile_size /2.0)) + result->y;
width = (o->tile_size +
g_rand_double_range (gr, -o->tile_size / 8.0, o->tile_size / 8.0))
* o->tile_saturation;
height = (o->tile_size +
g_rand_double_range (gr, -o->tile_size / 8.0, o->tile_size / 8.0))
* o->tile_saturation;
theta = g_rand_double_range (gr, 0, 2 * G_PI);
polygon_reset (&poly);
polygon_add_point (&poly, -width / 2.0, -height / 2.0);
polygon_add_point (&poly, width / 2.0, -height / 2.0);
polygon_add_point (&poly, width / 2.0, height / 2.0);
polygon_add_point (&poly, -width / 2.0, height / 2.0);
polygon_rotate (&poly, theta);
polygon_translate (&poly, x, y);
ix = CLAMP (x, boundary.x, boundary.x + boundary.width - 1);
iy = CLAMP (y, boundary.y, boundary.y + boundary.height - 1);
gegl_buffer_sample (input, ix, iy, NULL, color, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
fill_poly_color (&poly, &extended, &boundary, dst_buf, color);
}
gegl_buffer_set (output, &extended, 0, format, dst_buf, GEGL_AUTO_ROWSTRIDE);
g_free (dst_buf);
g_free (random_indices);
g_free (gr);
return TRUE;
}
GeglBuffer *
gimp_pickable_contiguous_region_by_seed (GimpPickable *pickable,
gboolean antialias,
gfloat threshold,
gboolean select_transparent,
GimpSelectCriterion select_criterion,
gboolean diagonal_neighbors,
gint x,
gint y)
{
GeglBuffer *src_buffer;
GeglBuffer *mask_buffer;
const Babl *format;
GeglRectangle extent;
gint n_components;
gboolean has_alpha;
gfloat start_col[MAX_CHANNELS];
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
gimp_pickable_flush (pickable);
src_buffer = gimp_pickable_get_buffer (pickable);
format = choose_format (src_buffer, select_criterion,
&n_components, &has_alpha);
gegl_buffer_sample (src_buffer, x, y, NULL, start_col, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
if (has_alpha)
{
if (select_transparent)
{
/* don't select transparent regions if the start pixel isn't
* fully transparent
*/
if (start_col[n_components - 1] > 0)
select_transparent = FALSE;
}
}
else
{
select_transparent = FALSE;
}
extent = *gegl_buffer_get_extent (src_buffer);
mask_buffer = gegl_buffer_new (&extent, babl_format ("Y float"));
if (x >= extent.x && x < (extent.x + extent.width) &&
y >= extent.y && y < (extent.y + extent.height))
{
GIMP_TIMER_START();
find_contiguous_region (src_buffer, mask_buffer,
format, n_components, has_alpha,
select_transparent, select_criterion,
antialias, threshold, diagonal_neighbors,
x, y, start_col);
GIMP_TIMER_END("foo");
}
return mask_buffer;
}
GeglBuffer *
gimp_image_contiguous_region_by_seed (GimpImage *image,
GimpDrawable *drawable,
gboolean sample_merged,
gboolean antialias,
gfloat threshold,
gboolean select_transparent,
GimpSelectCriterion select_criterion,
gint x,
gint y)
{
GimpPickable *pickable;
GeglBuffer *src_buffer;
GeglBuffer *mask_buffer;
const Babl *format;
gint n_components;
gboolean has_alpha;
gfloat start_col[MAX_CHANNELS];
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
if (sample_merged)
pickable = GIMP_PICKABLE (image);
else
pickable = GIMP_PICKABLE (drawable);
gimp_pickable_flush (pickable);
src_buffer = gimp_pickable_get_buffer (pickable);
format = choose_format (src_buffer, select_criterion,
&n_components, &has_alpha);
gegl_buffer_sample (src_buffer, x, y, NULL, start_col, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
if (has_alpha)
{
if (select_transparent)
{
/* don't select transparent regions if the start pixel isn't
* fully transparent
*/
if (start_col[n_components - 1] > 0)
select_transparent = FALSE;
}
}
else
{
select_transparent = FALSE;
}
mask_buffer = gegl_buffer_new (gegl_buffer_get_extent (src_buffer),
babl_format ("Y float"));
find_contiguous_region_helper (src_buffer, mask_buffer,
format, n_components, has_alpha,
select_transparent, select_criterion,
antialias, threshold,
x, y, start_col);
return mask_buffer;
}
static void
find_contiguous_region_helper (GeglBuffer *src_buffer,
GeglBuffer *mask_buffer,
const Babl *format,
gint n_components,
gboolean has_alpha,
gboolean select_transparent,
GimpSelectCriterion select_criterion,
gboolean antialias,
gfloat threshold,
gint x,
gint y,
const gfloat *col)
{
gint start, end;
gint new_start, new_end;
GQueue *coord_stack;
coord_stack = g_queue_new ();
/* To avoid excessive memory allocation (y, start, end) tuples are
* stored in interleaved format:
*
* [y1] [start1] [end1] [y2] [start2] [end2]
*/
g_queue_push_tail (coord_stack, GINT_TO_POINTER (y));
g_queue_push_tail (coord_stack, GINT_TO_POINTER (x - 1));
g_queue_push_tail (coord_stack, GINT_TO_POINTER (x + 1));
do
{
y = GPOINTER_TO_INT (g_queue_pop_head (coord_stack));
start = GPOINTER_TO_INT (g_queue_pop_head (coord_stack));
end = GPOINTER_TO_INT (g_queue_pop_head (coord_stack));
for (x = start + 1; x < end; x++)
{
gfloat val;
gegl_buffer_sample (mask_buffer, x, y, NULL, &val,
babl_format ("Y float"),
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
if (val != 0.0)
continue;
if (! find_contiguous_segment (col, src_buffer, mask_buffer,
format,
n_components,
has_alpha,
gegl_buffer_get_width (src_buffer),
select_transparent, select_criterion,
antialias, threshold, x, y,
&new_start, &new_end))
continue;
if (y + 1 < gegl_buffer_get_height (src_buffer))
{
g_queue_push_tail (coord_stack, GINT_TO_POINTER (y + 1));
g_queue_push_tail (coord_stack, GINT_TO_POINTER (new_start));
g_queue_push_tail (coord_stack, GINT_TO_POINTER (new_end));
}
if (y - 1 >= 0)
{
g_queue_push_tail (coord_stack, GINT_TO_POINTER (y - 1));
g_queue_push_tail (coord_stack, GINT_TO_POINTER (new_start));
g_queue_push_tail (coord_stack, GINT_TO_POINTER (new_end));
}
}
}
while (! g_queue_is_empty (coord_stack));
g_queue_free (coord_stack);
}
static gboolean
find_contiguous_segment (const gfloat *col,
GeglBuffer *src_buffer,
GeglBuffer *mask_buffer,
const Babl *format,
gint n_components,
gboolean has_alpha,
gint width,
gboolean select_transparent,
GimpSelectCriterion select_criterion,
gboolean antialias,
gfloat threshold,
gint initial_x,
gint initial_y,
gint *start,
gint *end)
{
gfloat s[MAX_CHANNELS];
gfloat mask_row[width];
gfloat diff;
gegl_buffer_sample (src_buffer, initial_x, initial_y, NULL, s, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
diff = pixel_difference (col, s, antialias, threshold,
n_components, has_alpha, select_transparent,
select_criterion);
/* check the starting pixel */
if (! diff)
return FALSE;
mask_row[initial_x] = diff;
*start = initial_x - 1;
while (*start >= 0 && diff)
{
gegl_buffer_sample (src_buffer, *start, initial_y, NULL, s, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
diff = pixel_difference (col, s, antialias, threshold,
n_components, has_alpha, select_transparent,
select_criterion);
mask_row[*start] = diff;
if (diff)
(*start)--;
}
diff = 1;
*end = initial_x + 1;
while (*end < width && diff)
{
gegl_buffer_sample (src_buffer, *end, initial_y, NULL, s, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
diff = pixel_difference (col, s, antialias, threshold,
n_components, has_alpha, select_transparent,
select_criterion);
mask_row[*end] = diff;
if (diff)
(*end)++;
}
gegl_buffer_set (mask_buffer, GEGL_RECTANGLE (*start, initial_y,
*end - *start, 1),
0, babl_format ("Y float"), &mask_row[*start],
GEGL_AUTO_ROWSTRIDE);
return TRUE;
}
static gboolean
process (GeglOperation *operation,
GeglBuffer *input,
GeglBuffer *output,
const GeglRectangle *result,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
GeglRectangle boundary = get_effective_area (operation);
const Babl *format = babl_format ("RGBA float");
gint x,y;
gfloat *src_buf, *dst_buf;
gfloat dest[4];
gint i, offset = 0;
gboolean inside;
gdouble px, py;
GeglMatrix2 scale; /* a matrix indicating scaling factors around the
current center pixel.
*/
src_buf = g_new0 (gfloat, result->width * result->height * 4);
dst_buf = g_new0 (gfloat, result->width * result->height * 4);
gegl_buffer_get (input, result, 1.0, format, src_buf, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
if (o->middle)
{
o->pole_x = boundary.width / 2;
o->pole_y = boundary.height / 2;
}
for (y = result->y; y < result->y + result->height; y++)
for (x = result->x; x < result->x + result->width; x++)
{
#define gegl_unmap(u,v,ud,vd) { \
gdouble rx, ry; \
inside = calc_undistorted_coords ((gdouble)x, (gdouble)y, \
&rx, &ry, o, boundary); \
ud = rx; \
vd = ry; \
}
gegl_sampler_compute_scale (scale, x, y);
gegl_unmap(x,y,px,py);
#undef gegl_unmap
if (inside)
gegl_buffer_sample (input, px, py, &scale, dest, format,
GEGL_SAMPLER_NOHALO, GEGL_ABYSS_NONE);
else
for (i=0; i<4; i++)
dest[i] = 0.0;
for (i=0; i<4; i++)
dst_buf[offset++] = dest[i];
}
gegl_buffer_set (output, result, 0, format, dst_buf, GEGL_AUTO_ROWSTRIDE);
g_free (src_buf);
g_free (dst_buf);
return TRUE;
}
