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PIKApp/app/paint/pikabrushcore.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libpikamath/pikamath.h"
#include "paint-types.h"
#include "operations/layer-modes/pika-layer-modes.h"
#include "gegl/pika-babl.h"
#include "gegl/pika-gegl-loops.h"
#include "core/pikabrush-header.h"
#include "core/pikabrushgenerated.h"
#include "core/pikadrawable.h"
#include "core/pikadynamics.h"
#include "core/pikadynamicsoutput.h"
#include "core/pikaerror.h"
#include "core/pikaimage.h"
#include "core/pikasymmetry.h"
#include "core/pikatempbuf.h"
#include "pikabrushcore.h"
#include "pikabrushcore-loops.h"
#include "pikabrushcore-kernels.h"
#include "pikapaintoptions.h"
#include "pika-intl.h"
#define EPSILON 0.00001
enum
{
SET_BRUSH,
SET_DYNAMICS,
LAST_SIGNAL
};
/* local function prototypes */
static void pika_brush_core_finalize (GObject *object);
static gboolean pika_brush_core_start (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
const PikaCoords *coords,
GError **error);
static gboolean pika_brush_core_pre_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaPaintState paint_state,
guint32 time);
static void pika_brush_core_post_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaPaintState paint_state,
guint32 time);
static void pika_brush_core_interpolate (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
guint32 time);
static GeglBuffer * pika_brush_core_get_paint_buffer(PikaPaintCore *paint_core,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaLayerMode paint_mode,
const PikaCoords *coords,
gint *paint_buffer_x,
gint *paint_buffer_y,
gint *paint_width,
gint *paint_height);
static void pika_brush_core_real_set_brush (PikaBrushCore *core,
PikaBrush *brush);
static void pika_brush_core_real_set_dynamics (PikaBrushCore *core,
PikaDynamics *dynamics);
static gdouble pika_brush_core_get_angle (PikaBrushCore *core);
static gboolean pika_brush_core_get_reflect (PikaBrushCore *core);
static const PikaTempBuf *
pika_brush_core_transform_mask (PikaBrushCore *core,
PikaBrush *brush);
static void pika_brush_core_invalidate_cache (PikaBrush *brush,
PikaBrushCore *core);
G_DEFINE_TYPE (PikaBrushCore, pika_brush_core, PIKA_TYPE_PAINT_CORE)
#define parent_class pika_brush_core_parent_class
static guint core_signals[LAST_SIGNAL] = { 0, };
static void
pika_brush_core_class_init (PikaBrushCoreClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaPaintCoreClass *paint_core_class = PIKA_PAINT_CORE_CLASS (klass);
core_signals[SET_BRUSH] =
g_signal_new ("set-brush",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PikaBrushCoreClass, set_brush),
NULL, NULL, NULL,
G_TYPE_NONE, 1,
PIKA_TYPE_BRUSH);
core_signals[SET_DYNAMICS] =
g_signal_new ("set-dynamics",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PikaBrushCoreClass, set_dynamics),
NULL, NULL, NULL,
G_TYPE_NONE, 1,
PIKA_TYPE_DYNAMICS);
object_class->finalize = pika_brush_core_finalize;
paint_core_class->start = pika_brush_core_start;
paint_core_class->pre_paint = pika_brush_core_pre_paint;
paint_core_class->post_paint = pika_brush_core_post_paint;
paint_core_class->interpolate = pika_brush_core_interpolate;
paint_core_class->get_paint_buffer = pika_brush_core_get_paint_buffer;
klass->handles_changing_brush = FALSE;
klass->handles_transforming_brush = TRUE;
klass->handles_dynamic_transforming_brush = TRUE;
klass->set_brush = pika_brush_core_real_set_brush;
klass->set_dynamics = pika_brush_core_real_set_dynamics;
}
static void
pika_brush_core_init (PikaBrushCore *core)
{
gint i, j;
core->main_brush = NULL;
core->brush = NULL;
core->dynamics = NULL;
core->spacing = 1.0;
core->scale = 1.0;
core->angle = 0.0;
core->reflect = FALSE;
core->hardness = 1.0;
core->aspect_ratio = 0.0;
core->symmetry_angle = 0.0;
core->symmetry_reflect = FALSE;
core->pressure_brush = NULL;
core->last_solid_brush_mask = NULL;
core->solid_cache_invalid = FALSE;
core->transform_brush = NULL;
core->transform_pixmap = NULL;
core->last_subsample_brush_mask = NULL;
core->subsample_cache_invalid = FALSE;
core->rand = g_rand_new ();
for (i = 0; i < BRUSH_CORE_SOLID_SUBSAMPLE; i++)
{
for (j = 0; j < BRUSH_CORE_SOLID_SUBSAMPLE; j++)
{
core->solid_brushes[i][j] = NULL;
}
}
for (i = 0; i < BRUSH_CORE_JITTER_LUTSIZE - 1; ++i)
{
core->jitter_lut_y[i] = cos (pika_deg_to_rad (i * 360 /
BRUSH_CORE_JITTER_LUTSIZE));
core->jitter_lut_x[i] = sin (pika_deg_to_rad (i * 360 /
BRUSH_CORE_JITTER_LUTSIZE));
}
pika_assert (BRUSH_CORE_SUBSAMPLE == KERNEL_SUBSAMPLE);
for (i = 0; i < KERNEL_SUBSAMPLE + 1; i++)
{
for (j = 0; j < KERNEL_SUBSAMPLE + 1; j++)
{
core->subsample_brushes[i][j] = NULL;
}
}
}
static void
pika_brush_core_finalize (GObject *object)
{
PikaBrushCore *core = PIKA_BRUSH_CORE (object);
gint i, j;
g_clear_pointer (&core->pressure_brush, pika_temp_buf_unref);
for (i = 0; i < BRUSH_CORE_SOLID_SUBSAMPLE; i++)
for (j = 0; j < BRUSH_CORE_SOLID_SUBSAMPLE; j++)
g_clear_pointer (&core->solid_brushes[i][j], pika_temp_buf_unref);
g_clear_pointer (&core->rand, g_rand_free);
for (i = 0; i < KERNEL_SUBSAMPLE + 1; i++)
for (j = 0; j < KERNEL_SUBSAMPLE + 1; j++)
g_clear_pointer (&core->subsample_brushes[i][j], pika_temp_buf_unref);
if (core->main_brush)
{
g_signal_handlers_disconnect_by_func (core->main_brush,
pika_brush_core_invalidate_cache,
core);
pika_brush_end_use (core->main_brush);
g_clear_object (&core->main_brush);
}
g_clear_object (&core->dynamics);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
pika_brush_core_pre_paint (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaPaintState paint_state,
guint32 time)
{
PikaBrushCore *core = PIKA_BRUSH_CORE (paint_core);
if (paint_state == PIKA_PAINT_STATE_MOTION)
{
PikaCoords last_coords;
PikaCoords current_coords;
gdouble scale;
pika_paint_core_get_last_coords (paint_core, &last_coords);
pika_paint_core_get_current_coords (paint_core, &current_coords);
/* If we current point == last point, check if the brush
* wants to be painted in that case. (Direction dependent
* pixmap brush pipes don't, as they don't know which
* pixmap to select.)
*/
if (last_coords.x == current_coords.x &&
last_coords.y == current_coords.y &&
! pika_brush_want_null_motion (core->main_brush,
&last_coords,
&current_coords))
{
return FALSE;
}
/*No drawing anything if the scale is too small*/
if (PIKA_BRUSH_CORE_GET_CLASS (core)->handles_transforming_brush)
{
PikaImage *image = pika_item_get_image (PIKA_ITEM (drawables->data));
gdouble fade_point;
if (PIKA_BRUSH_CORE_GET_CLASS (core)->handles_dynamic_transforming_brush)
{
gdouble width;
gdouble height;
fade_point = pika_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
width = pika_brush_get_width (core->main_brush);
height = pika_brush_get_height (core->main_brush);
scale = paint_options->brush_size /
MAX (width, height) *
pika_dynamics_get_linear_value (core->dynamics,
PIKA_DYNAMICS_OUTPUT_SIZE,
&current_coords,
paint_options,
fade_point);
if (paint_options->brush_lock_to_view &&
MAX (current_coords.xscale, current_coords.yscale) > 0)
{
scale /= MAX (current_coords.xscale, current_coords.yscale);
/* Cap transform result for brushes or OOM can occur */
if ((scale * MAX (width, height)) > PIKA_BRUSH_MAX_SIZE)
{
scale = PIKA_BRUSH_MAX_SIZE / MAX (width, height);
}
}
if (scale < 0.0000001)
return FALSE;
}
}
if (PIKA_BRUSH_CORE_GET_CLASS (paint_core)->handles_changing_brush)
{
core->brush = pika_brush_select_brush (core->main_brush,
&last_coords,
&current_coords);
}
if ((! PIKA_IS_BRUSH_GENERATED(core->main_brush)) &&
(paint_options->brush_hardness != pika_brush_get_blur_hardness(core->main_brush)))
{
pika_brush_flush_blur_caches(core->main_brush);
}
}
return TRUE;
}
static void
pika_brush_core_post_paint (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaPaintState paint_state,
guint32 time)
{
PikaBrushCore *core = PIKA_BRUSH_CORE (paint_core);
if (paint_state == PIKA_PAINT_STATE_MOTION)
{
core->brush = core->main_brush;
}
}
static gboolean
pika_brush_core_start (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
const PikaCoords *coords,
GError **error)
{
PikaBrushCore *core = PIKA_BRUSH_CORE (paint_core);
PikaContext *context = PIKA_CONTEXT (paint_options);
PikaImage *image = NULL;
g_return_val_if_fail (drawables != NULL, FALSE);
pika_brush_core_set_brush (core, pika_context_get_brush (context));
if (pika_paint_options_are_dynamics_enabled (paint_options))
{
pika_brush_core_set_dynamics (core, pika_context_get_dynamics (context));
}
else
{
PikaDynamics *dynamics_off = PIKA_DYNAMICS (pika_dynamics_new (context,
"Dynamics Off"));
pika_brush_core_set_dynamics (core, dynamics_off);
g_object_unref (dynamics_off);
}
if (! core->main_brush)
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("No brushes available for use with this tool."));
return FALSE;
}
if (! core->dynamics)
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("No paint dynamics available for use with this tool."));
return FALSE;
}
for (GList *iter = drawables; iter; iter = iter->next)
if (image == NULL)
image = pika_item_get_image (PIKA_ITEM (iter->data));
else
g_return_val_if_fail (image == pika_item_get_image (PIKA_ITEM (iter->data)),
FALSE);
if (PIKA_BRUSH_CORE_GET_CLASS (core)->handles_transforming_brush)
{
pika_brush_core_eval_transform_dynamics (core,
image,
paint_options,
coords);
pika_brush_core_eval_transform_symmetry (core, NULL, 0);
}
core->spacing = paint_options->brush_spacing;
core->brush = core->main_brush;
core->jitter =
pika_paint_options_get_jitter (paint_options, image);
return TRUE;
}
/**
* pika_avoid_exact_integer
* @x: points to a gdouble
*
* Adjusts *x such that it is not too close to an integer. This is used
* for decision algorithms that would be vulnerable to rounding glitches
* if exact integers were input.
*
* Side effects: Changes the value of *x
**/
static void
pika_avoid_exact_integer (gdouble *x)
{
const gdouble integral = floor (*x);
const gdouble fractional = *x - integral;
if (fractional < EPSILON)
{
*x = integral + EPSILON;
}
else if (fractional > (1 -EPSILON))
{
*x = integral + (1 - EPSILON);
}
}
static void
pika_brush_core_interpolate (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
guint32 time)
{
PikaBrushCore *core = PIKA_BRUSH_CORE (paint_core);
PikaImage *image = pika_item_get_image (PIKA_ITEM (drawables->data));
PikaDynamicsOutput *spacing_output;
PikaCoords last_coords;
PikaCoords current_coords;
PikaVector2 delta_vec;
gdouble delta_pressure;
gdouble delta_xtilt, delta_ytilt;
gdouble delta_wheel;
gdouble delta_velocity;
gdouble temp_direction;
PikaVector2 temp_vec;
gint n, num_points;
gdouble t0, dt, tn;
gdouble st_factor, st_offset;
gdouble initial;
gdouble dist;
gdouble total;
gdouble pixel_dist;
gdouble pixel_initial;
gdouble xd, yd;
gdouble mag;
gdouble dyn_spacing = core->spacing;
gdouble fade_point;
gboolean use_dyn_spacing;
g_return_if_fail (PIKA_IS_BRUSH (core->brush));
pika_paint_core_get_last_coords (paint_core, &last_coords);
pika_paint_core_get_current_coords (paint_core, &current_coords);
pika_avoid_exact_integer (&last_coords.x);
pika_avoid_exact_integer (&last_coords.y);
pika_avoid_exact_integer (&current_coords.x);
pika_avoid_exact_integer (&current_coords.y);
delta_vec.x = current_coords.x - last_coords.x;
delta_vec.y = current_coords.y - last_coords.y;
delta_pressure = current_coords.pressure - last_coords.pressure;
delta_xtilt = current_coords.xtilt - last_coords.xtilt;
delta_ytilt = current_coords.ytilt - last_coords.ytilt;
delta_wheel = current_coords.wheel - last_coords.wheel;
delta_velocity = current_coords.velocity - last_coords.velocity;
temp_direction = current_coords.direction;
/* return if there has been no motion */
if (! delta_vec.x &&
! delta_vec.y &&
! delta_pressure &&
! delta_xtilt &&
! delta_ytilt &&
! delta_wheel &&
! delta_velocity)
return;
pixel_dist = pika_vector2_length (&delta_vec);
pixel_initial = paint_core->pixel_dist;
/* Zero sized brushes are unfit for interpolate, so we just let
* paint core fail on its own
*/
if (core->scale == 0.0)
{
pika_paint_core_set_last_coords (paint_core, &current_coords);
pika_paint_core_paint (paint_core, drawables, paint_options,
PIKA_PAINT_STATE_MOTION, time);
paint_core->pixel_dist = pixel_initial + pixel_dist; /* Don't forget to update pixel distance*/
return;
}
/* Handle dynamic spacing */
spacing_output = pika_dynamics_get_output (core->dynamics,
PIKA_DYNAMICS_OUTPUT_SPACING);
fade_point = pika_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
use_dyn_spacing = pika_dynamics_output_is_enabled (spacing_output);
if (use_dyn_spacing)
{
dyn_spacing = pika_dynamics_output_get_linear_value (spacing_output,
&current_coords,
paint_options,
fade_point);
/* Dynamic spacing assumes that the value set in core is the min
* value and the max is full 200% spacing. This approach differs
* from the usual factor from user input approach because making
* spacing smaller than the nominal value is unlikely and
* spacing has a hard defined max.
*/
dyn_spacing = (core->spacing +
((2.0 - core->spacing) * (1.0 - dyn_spacing)));
/* Limiting spacing to minimum 1% */
dyn_spacing = MAX (core->spacing, dyn_spacing);
}
/* calculate the distance traveled in the coordinate space of the brush */
temp_vec = pika_brush_get_x_axis (core->brush);
pika_vector2_mul (&temp_vec, core->scale);
pika_vector2_rotate (&temp_vec, core->angle * G_PI * 2);
mag = pika_vector2_length (&temp_vec);
xd = pika_vector2_inner_product (&delta_vec, &temp_vec) / (mag * mag);
temp_vec = pika_brush_get_y_axis (core->brush);
pika_vector2_mul (&temp_vec, core->scale);
pika_vector2_rotate (&temp_vec, core->angle * G_PI * 2);
mag = pika_vector2_length (&temp_vec);
yd = pika_vector2_inner_product (&delta_vec, &temp_vec) / (mag * mag);
dist = 0.5 * sqrt (xd * xd + yd * yd);
total = dist + paint_core->distance;
initial = paint_core->distance;
if (delta_vec.x * delta_vec.x > delta_vec.y * delta_vec.y)
{
st_factor = delta_vec.x;
st_offset = last_coords.x - 0.5;
}
else
{
st_factor = delta_vec.y;
st_offset = last_coords.y - 0.5;
}
if (use_dyn_spacing)
{
gint s0;
num_points = dist / dyn_spacing;
s0 = (gint) floor (st_offset + 0.5);
t0 = (s0 - st_offset) / st_factor;
dt = dyn_spacing / dist;
if (num_points == 0)
return;
}
else if (fabs (st_factor) > dist / core->spacing)
{
/* The stripe principle leads to brush positions that are spaced
* *closer* than the official brush spacing. Use the official
* spacing instead. This is the common case when the brush spacing
* is large.
* The net effect is then to put a lower bound on the spacing, but
* one that varies with the slope of the line. This is suppose to
* make thin lines (say, with a 1x1 brush) prettier while leaving
* lines with larger brush spacing as they used to look in 1.2.x.
*/
dt = core->spacing / dist;
n = (gint) (initial / core->spacing + 1.0 + EPSILON);
t0 = (n * core->spacing - initial) / dist;
num_points = 1 + (gint) floor ((1 + EPSILON - t0) / dt);
/* if we arnt going to paint anything this time and the brush
* has only moved on one axis return without updating the brush
* position, distance etc. so that we can more accurately space
* brush strokes when curves are supplied to us in single pixel
* chunks.
*/
if (num_points == 0 && (delta_vec.x == 0 || delta_vec.y == 0))
return;
}
else if (fabs (st_factor) < EPSILON)
{
/* Hm, we've hardly moved at all. Don't draw anything, but reset the
* old coordinates and hope we've gone longer the next time...
*/
current_coords.x = last_coords.x;
current_coords.y = last_coords.y;
pika_paint_core_set_current_coords (paint_core, &current_coords);
/* ... but go along with the current pressure, tilt and wheel */
return;
}
else
{
gint direction = st_factor > 0 ? 1 : -1;
gint x, y;
gint s0, sn;
/* Choose the first and last stripe to paint.
* FIRST PRIORITY is to avoid gaps painting with a 1x1 aliasing
* brush when a horizontalish line segment follows a verticalish
* one or vice versa - no matter what the angle between the two
* lines is. This will also limit the local thinning that a 1x1
* subsampled brush may suffer in the same situation.
* SECOND PRIORITY is to avoid making free-hand drawings
* unpleasantly fat by plotting redundant points.
* These are achieved by the following rules, but it is a little
* tricky to see just why. Do not change this algorithm unless you
* are sure you know what you're doing!
*/
/* Basic case: round the beginning and ending point to nearest
* stripe center.
*/
s0 = (gint) floor (st_offset + 0.5);
sn = (gint) floor (st_offset + st_factor + 0.5);
t0 = (s0 - st_offset) / st_factor;
tn = (sn - st_offset) / st_factor;
x = (gint) floor (last_coords.x + t0 * delta_vec.x);
y = (gint) floor (last_coords.y + t0 * delta_vec.y);
if (t0 < 0.0 && !( x == (gint) floor (last_coords.x) &&
y == (gint) floor (last_coords.y) ))
{
/* Exception A: If the first stripe's brush position is
* EXTRApolated into a different pixel square than the
* ideal starting point, don't plot it.
*/
s0 += direction;
}
else if (x == (gint) floor (paint_core->last_paint.x) &&
y == (gint) floor (paint_core->last_paint.y))
{
/* Exception B: If first stripe's brush position is within the
* same pixel square as the last plot of the previous line,
* don't plot it either.
*/
s0 += direction;
}
x = (gint) floor (last_coords.x + tn * delta_vec.x);
y = (gint) floor (last_coords.y + tn * delta_vec.y);
if (tn > 1.0 && !( x == (gint) floor (current_coords.x) &&
y == (gint) floor (current_coords.y)))
{
/* Exception C: If the last stripe's brush position is
* EXTRApolated into a different pixel square than the
* ideal ending point, don't plot it.
*/
sn -= direction;
}
t0 = (s0 - st_offset) / st_factor;
tn = (sn - st_offset) / st_factor;
dt = direction * 1.0 / st_factor;
num_points = 1 + direction * (sn - s0);
if (num_points >= 1)
{
/* Hack the reported total distance such that it looks to the
* next line as if the the last pixel plotted were at an integer
* multiple of the brush spacing. This helps prevent artifacts
* for connected lines when the brush spacing is such that some
* slopes will use the stripe regime and other slopes will use
* the nominal brush spacing.
*/
if (tn < 1)
total = initial + tn * dist;
total = core->spacing * (gint) (total / core->spacing + 0.5);
total += (1.0 - tn) * dist;
}
}
for (n = 0; n < num_points; n++)
{
gdouble t = t0 + n * dt;
gdouble p = (gdouble) n / num_points;
current_coords.x = last_coords.x + t * delta_vec.x;
current_coords.y = last_coords.y + t * delta_vec.y;
current_coords.pressure = last_coords.pressure + p * delta_pressure;
current_coords.xtilt = last_coords.xtilt + p * delta_xtilt;
current_coords.ytilt = last_coords.ytilt + p * delta_ytilt;
current_coords.wheel = last_coords.wheel + p * delta_wheel;
current_coords.velocity = last_coords.velocity + p * delta_velocity;
current_coords.direction = temp_direction;
current_coords.xscale = last_coords.xscale;
current_coords.yscale = last_coords.yscale;
current_coords.angle = last_coords.angle;
current_coords.reflect = last_coords.reflect;
if (core->jitter > 0.0)
{
PikaVector2 x_axis;
PikaVector2 y_axis;
gdouble dyn_jitter;
gdouble jitter_dist;
gint32 jitter_angle;
x_axis = pika_brush_get_x_axis (core->brush);
y_axis = pika_brush_get_y_axis (core->brush);
dyn_jitter = (core->jitter *
pika_dynamics_get_linear_value (core->dynamics,
PIKA_DYNAMICS_OUTPUT_JITTER,
&current_coords,
paint_options,
fade_point));
jitter_dist = g_rand_double_range (core->rand, 0, dyn_jitter);
jitter_angle = g_rand_int_range (core->rand,
0, BRUSH_CORE_JITTER_LUTSIZE);
current_coords.x +=
(x_axis.x + y_axis.x) *
jitter_dist * core->jitter_lut_x[jitter_angle] * core->scale;
current_coords.y +=
(y_axis.y + x_axis.y) *
jitter_dist * core->jitter_lut_y[jitter_angle] * core->scale;
}
pika_paint_core_set_current_coords (paint_core, &current_coords);
paint_core->distance = initial + t * dist;
paint_core->pixel_dist = pixel_initial + t * pixel_dist;
pika_paint_core_paint (paint_core, drawables, paint_options,
PIKA_PAINT_STATE_MOTION, time);
}
current_coords.x = last_coords.x + delta_vec.x;
current_coords.y = last_coords.y + delta_vec.y;
current_coords.pressure = last_coords.pressure + delta_pressure;
current_coords.xtilt = last_coords.xtilt + delta_xtilt;
current_coords.ytilt = last_coords.ytilt + delta_ytilt;
current_coords.wheel = last_coords.wheel + delta_wheel;
current_coords.velocity = last_coords.velocity + delta_velocity;
current_coords.xscale = last_coords.xscale;
current_coords.yscale = last_coords.yscale;
current_coords.angle = last_coords.angle;
current_coords.reflect = last_coords.reflect;
pika_paint_core_set_current_coords (paint_core, &current_coords);
pika_paint_core_set_last_coords (paint_core, &current_coords);
paint_core->distance = total;
paint_core->pixel_dist = pixel_initial + pixel_dist;
}
static GeglBuffer *
pika_brush_core_get_paint_buffer (PikaPaintCore *paint_core,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaLayerMode paint_mode,
const PikaCoords *coords,
gint *paint_buffer_x,
gint *paint_buffer_y,
gint *paint_width,
gint *paint_height)
{
PikaBrushCore *core = PIKA_BRUSH_CORE (paint_core);
gint x, y;
gint x1, y1, x2, y2;
gint drawable_width, drawable_height;
gint brush_width, brush_height;
gint offset_change_x, offset_change_y;
PikaCoords new_coords;
pika_brush_transform_size (core->brush,
core->scale, core->aspect_ratio,
pika_brush_core_get_angle (core),
pika_brush_core_get_reflect (core),
&brush_width, &brush_height);
if (paint_width)
*paint_width = brush_width;
if (paint_height)
*paint_height = brush_height;
/* adjust the x and y coordinates to the upper left corner of the brush */
x = (gint) floor (coords->x) - (brush_width / 2);
y = (gint) floor (coords->y) - (brush_height / 2);
x1 = x - 1;
y1 = y - 1;
x2 = x + brush_width + 1;
y2 = y + brush_height + 1;
pika_paint_core_expand_drawable (paint_core, drawable, paint_options,
x1, x2, y1, y2,
&offset_change_x, &offset_change_y);
if (offset_change_x || offset_change_y)
{
x += offset_change_x;
y += offset_change_y;
new_coords = *coords;
new_coords.x = coords->x + offset_change_x;
new_coords.y = coords->y + offset_change_y;
pika_symmetry_set_origin (paint_core->sym, drawable, &new_coords);
}
drawable_width = pika_item_get_width (PIKA_ITEM (drawable));
drawable_height = pika_item_get_height (PIKA_ITEM (drawable));
x1 = CLAMP (x - 1, 0, drawable_width);
y1 = CLAMP (y - 1, 0, drawable_height);
x2 = CLAMP (x + brush_width + 1, 0, drawable_width);
y2 = CLAMP (y + brush_height + 1, 0, drawable_height);
/* configure the canvas buffer */
if ((x2 - x1) && (y2 - y1))
{
PikaTempBuf *temp_buf;
const Babl *format;
PikaLayerCompositeMode composite_mode;
composite_mode = pika_layer_mode_get_paint_composite_mode (paint_mode);
format = pika_layer_mode_get_format (paint_mode,
PIKA_LAYER_COLOR_SPACE_AUTO,
PIKA_LAYER_COLOR_SPACE_AUTO,
composite_mode,
pika_drawable_get_format (drawable));
if (paint_core->paint_buffer &&
gegl_buffer_get_width (paint_core->paint_buffer) == (x2 - x1) &&
gegl_buffer_get_height (paint_core->paint_buffer) == (y2 - y1) &&
gegl_buffer_get_format (paint_core->paint_buffer) == format)
{
*paint_buffer_x = x1;
*paint_buffer_y = y1;
return paint_core->paint_buffer;
}
g_clear_object (&paint_core->paint_buffer);
temp_buf = pika_temp_buf_new ((x2 - x1), (y2 - y1),
format);
*paint_buffer_x = x1;
*paint_buffer_y = y1;
paint_core->paint_buffer = pika_temp_buf_create_buffer (temp_buf);
pika_temp_buf_unref (temp_buf);
return paint_core->paint_buffer;
}
return NULL;
}
static void
pika_brush_core_real_set_brush (PikaBrushCore *core,
PikaBrush *brush)
{
if (brush == core->main_brush)
return;
if (core->main_brush)
{
g_signal_handlers_disconnect_by_func (core->main_brush,
pika_brush_core_invalidate_cache,
core);
pika_brush_end_use (core->main_brush);
}
g_set_object (&core->main_brush, brush);
if (core->main_brush)
{
pika_brush_begin_use (core->main_brush);
g_signal_connect (core->main_brush, "invalidate-preview",
G_CALLBACK (pika_brush_core_invalidate_cache),
core);
}
}
static void
pika_brush_core_real_set_dynamics (PikaBrushCore *core,
PikaDynamics *dynamics)
{
g_set_object (&core->dynamics, dynamics);
}
void
pika_brush_core_set_brush (PikaBrushCore *core,
PikaBrush *brush)
{
g_return_if_fail (PIKA_IS_BRUSH_CORE (core));
g_return_if_fail (brush == NULL || PIKA_IS_BRUSH (brush));
if (brush != core->main_brush)
g_signal_emit (core, core_signals[SET_BRUSH], 0, brush);
}
void
pika_brush_core_set_dynamics (PikaBrushCore *core,
PikaDynamics *dynamics)
{
g_return_if_fail (PIKA_IS_BRUSH_CORE (core));
g_return_if_fail (dynamics == NULL || PIKA_IS_DYNAMICS (dynamics));
if (dynamics != core->dynamics)
g_signal_emit (core, core_signals[SET_DYNAMICS], 0, dynamics);
}
void
pika_brush_core_paste_canvas (PikaBrushCore *core,
PikaDrawable *drawable,
const PikaCoords *coords,
gdouble brush_opacity,
gdouble image_opacity,
PikaLayerMode paint_mode,
PikaBrushApplicationMode brush_hardness,
gdouble dynamic_force,
PikaPaintApplicationMode mode)
{
const PikaTempBuf *brush_mask;
brush_mask = pika_brush_core_get_brush_mask (core, coords,
brush_hardness,
dynamic_force);
if (brush_mask)
{
PikaPaintCore *paint_core = PIKA_PAINT_CORE (core);
gint x;
gint y;
gint off_x;
gint off_y;
x = (gint) floor (coords->x) - (pika_temp_buf_get_width (brush_mask) >> 1);
y = (gint) floor (coords->y) - (pika_temp_buf_get_height (brush_mask) >> 1);
off_x = (x < 0) ? -x : 0;
off_y = (y < 0) ? -y : 0;
pika_paint_core_paste (paint_core, brush_mask,
off_x, off_y,
drawable,
brush_opacity,
image_opacity,
paint_mode,
mode);
}
}
/* Similar to pika_brush_core_paste_canvas, but replaces the alpha channel
* rather than using it to composite (i.e. transparent over opaque
* becomes transparent rather than opauqe.
*/
void
pika_brush_core_replace_canvas (PikaBrushCore *core,
PikaDrawable *drawable,
const PikaCoords *coords,
gdouble brush_opacity,
gdouble image_opacity,
PikaBrushApplicationMode brush_hardness,
gdouble dynamic_force,
PikaPaintApplicationMode mode)
{
const PikaTempBuf *brush_mask;
brush_mask = pika_brush_core_get_brush_mask (core, coords,
brush_hardness,
dynamic_force);
if (brush_mask)
{
PikaPaintCore *paint_core = PIKA_PAINT_CORE (core);
gint x;
gint y;
gint off_x;
gint off_y;
x = (gint) floor (coords->x) - (pika_temp_buf_get_width (brush_mask) >> 1);
y = (gint) floor (coords->y) - (pika_temp_buf_get_height (brush_mask) >> 1);
off_x = (x < 0) ? -x : 0;
off_y = (y < 0) ? -y : 0;
pika_paint_core_replace (paint_core, brush_mask,
off_x, off_y,
drawable,
brush_opacity,
image_opacity,
mode);
}
}
static void
pika_brush_core_invalidate_cache (PikaBrush *brush,
PikaBrushCore *core)
{
/* Make sure we don't cache data for a brush that has changed */
core->subsample_cache_invalid = TRUE;
core->solid_cache_invalid = TRUE;
/* Notify of the brush change */
g_signal_emit (core, core_signals[SET_BRUSH], 0, brush);
}
/************************************************************
* LOCAL FUNCTION DEFINITIONS *
************************************************************/
static gdouble
pika_brush_core_get_angle (PikaBrushCore *core)
{
gdouble angle = core->angle;
if (core->reflect)
angle -= core->symmetry_angle;
else
angle += core->symmetry_angle;
angle = fmod (angle, 1.0);
if (angle < 0.0)
angle += 1.0;
return angle;
}
static gboolean
pika_brush_core_get_reflect (PikaBrushCore *core)
{
return core->reflect ^ core->symmetry_reflect;
}
static const PikaTempBuf *
pika_brush_core_transform_mask (PikaBrushCore *core,
PikaBrush *brush)
{
const PikaTempBuf *mask;
if (core->scale <= 0.0)
return NULL;
mask = pika_brush_transform_mask (brush,
core->scale,
core->aspect_ratio,
pika_brush_core_get_angle (core),
pika_brush_core_get_reflect (core),
core->hardness);
if (mask == core->transform_brush)
return mask;
core->transform_brush = mask;
core->subsample_cache_invalid = TRUE;
core->solid_cache_invalid = TRUE;
return core->transform_brush;
}
const PikaTempBuf *
pika_brush_core_get_brush_mask (PikaBrushCore *core,
const PikaCoords *coords,
PikaBrushApplicationMode brush_hardness,
gdouble dynamic_force)
{
const PikaTempBuf *mask;
if (dynamic_force <= 0.0)
return NULL;
mask = pika_brush_core_transform_mask (core, core->brush);
if (! mask)
return NULL;
switch (brush_hardness)
{
case PIKA_BRUSH_SOFT:
return pika_brush_core_subsample_mask (core, mask,
coords->x,
coords->y);
break;
case PIKA_BRUSH_HARD:
return pika_brush_core_solidify_mask (core, mask,
coords->x,
coords->y);
break;
case PIKA_BRUSH_PRESSURE:
return pika_brush_core_pressurize_mask (core, mask,
coords->x,
coords->y,
dynamic_force);
break;
}
g_return_val_if_reached (NULL);
}
const PikaTempBuf *
pika_brush_core_get_brush_pixmap (PikaBrushCore *core)
{
const PikaTempBuf *pixmap;
if (core->scale <= 0.0)
return NULL;
pixmap = pika_brush_transform_pixmap (core->brush,
core->scale,
core->aspect_ratio,
pika_brush_core_get_angle (core),
pika_brush_core_get_reflect (core),
core->hardness);
if (pixmap == core->transform_pixmap)
return pixmap;
core->transform_pixmap = pixmap;
core->subsample_cache_invalid = TRUE;
return core->transform_pixmap;
}
void
pika_brush_core_eval_transform_dynamics (PikaBrushCore *core,
PikaImage *image,
PikaPaintOptions *paint_options,
const PikaCoords *coords)
{
if (core->main_brush)
{
gdouble max_side;
max_side = MAX (pika_brush_get_width (core->main_brush),
pika_brush_get_height (core->main_brush));
core->scale = paint_options->brush_size / max_side;
if (paint_options->brush_lock_to_view &&
MAX (coords->xscale, coords->yscale) > 0)
{
core->scale /= MAX (coords->xscale, coords->yscale);
/* Cap transform result for brushes or OOM can occur */
if ((core->scale * max_side) > PIKA_BRUSH_MAX_SIZE)
{
core->scale = PIKA_BRUSH_MAX_SIZE / max_side;
}
}
}
else
core->scale = -1;
core->aspect_ratio = paint_options->brush_aspect_ratio;
core->angle = paint_options->brush_angle;
core->reflect = FALSE;
core->hardness = paint_options->brush_hardness;
if (paint_options->brush_lock_to_view)
{
core->angle += coords->angle;
core->reflect = coords->reflect;
}
if (! PIKA_IS_DYNAMICS (core->dynamics) ||
! pika_paint_options_are_dynamics_enabled (paint_options))
return;
if (PIKA_BRUSH_CORE_GET_CLASS (core)->handles_dynamic_transforming_brush)
{
gdouble fade_point = 1.0;
if (image)
{
PikaPaintCore *paint_core = PIKA_PAINT_CORE (core);
fade_point = pika_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
}
core->scale *= pika_dynamics_get_linear_value (core->dynamics,
PIKA_DYNAMICS_OUTPUT_SIZE,
coords,
paint_options,
fade_point);
core->angle += pika_dynamics_get_angular_value (core->dynamics,
PIKA_DYNAMICS_OUTPUT_ANGLE,
coords,
paint_options,
fade_point);
core->hardness *= pika_dynamics_get_linear_value (core->dynamics,
PIKA_DYNAMICS_OUTPUT_HARDNESS,
coords,
paint_options,
fade_point);
if (pika_dynamics_is_output_enabled (core->dynamics,
PIKA_DYNAMICS_OUTPUT_ASPECT_RATIO))
{
gdouble dyn_aspect;
dyn_aspect = pika_dynamics_get_aspect_value (core->dynamics,
PIKA_DYNAMICS_OUTPUT_ASPECT_RATIO,
coords,
paint_options,
fade_point);
/* Zero aspect ratio is special cased to half of all ar range,
* to force dynamics to have any effect. Forcing to full results
* in disappearing stamp if applied to maximum.
*/
if (core->aspect_ratio == 0.0)
core->aspect_ratio = 10.0 * dyn_aspect;
else
core->aspect_ratio *= dyn_aspect;
}
}
}
void
pika_brush_core_eval_transform_symmetry (PikaBrushCore *core,
PikaSymmetry *symmetry,
gint stroke)
{
g_return_if_fail (PIKA_IS_BRUSH_CORE (core));
g_return_if_fail (symmetry == NULL || PIKA_IS_SYMMETRY (symmetry));
core->symmetry_angle = 0.0;
core->symmetry_reflect = FALSE;
if (symmetry)
{
pika_symmetry_get_transform (symmetry,
stroke,
&core->symmetry_angle,
&core->symmetry_reflect);
core->symmetry_angle /= 360.0;
}
}
void
pika_brush_core_color_area_with_pixmap (PikaBrushCore *core,
PikaDrawable *drawable,
const PikaCoords *coords,
GeglBuffer *area,
gint area_x,
gint area_y,
gboolean apply_mask)
{
const PikaTempBuf *pixmap;
GeglBuffer *pixmap_buffer;
const PikaTempBuf *mask;
GeglBuffer *mask_buffer;
gint area_width;
gint area_height;
gint ul_x;
gint ul_y;
gint offset_x;
gint offset_y;
g_return_if_fail (PIKA_IS_BRUSH (core->brush));
g_return_if_fail (pika_brush_get_pixmap (core->brush) != NULL);
/* scale the brush */
pixmap = pika_brush_core_get_brush_pixmap (core);
if (! pixmap)
return;
if (apply_mask)
mask = pika_brush_core_transform_mask (core, core->brush);
else
mask = NULL;
/* Calculate upper left corner of brush as in
* pika_paint_core_get_paint_area. Ugly to have to do this here, too.
*/
ul_x = (gint) floor (coords->x) - (pika_temp_buf_get_width (pixmap) >> 1);
ul_y = (gint) floor (coords->y) - (pika_temp_buf_get_height (pixmap) >> 1);
/* Not sure why this is necessary, but empirically the code does
* not work without it for even-sided brushes. See bug #166622.
*/
if (pika_temp_buf_get_width (pixmap) % 2 == 0)
ul_x += ROUND (coords->x) - floor (coords->x);
if (pika_temp_buf_get_height (pixmap) % 2 == 0)
ul_y += ROUND (coords->y) - floor (coords->y);
offset_x = area_x - ul_x;
offset_y = area_y - ul_y;
area_width = gegl_buffer_get_width (area);
area_height = gegl_buffer_get_height (area);
pixmap_buffer = pika_temp_buf_create_buffer (pixmap);
pika_gegl_buffer_copy (pixmap_buffer,
GEGL_RECTANGLE (offset_x, offset_y,
area_width, area_height),
GEGL_ABYSS_NONE,
area,
GEGL_RECTANGLE (0, 0,
area_width, area_height));
g_object_unref (pixmap_buffer);
if (mask)
{
mask_buffer = pika_temp_buf_create_buffer (mask);
pika_gegl_apply_mask (mask_buffer,
GEGL_RECTANGLE (offset_x, offset_y,
area_width, area_height),
area,
GEGL_RECTANGLE (0, 0,
area_width, area_height),
1.0);
g_object_unref (mask_buffer);
}
}
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