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Diffstat (limited to 'app/paint/gimpbrushcore.c')
| -rw-r--r-- | app/paint/gimpbrushcore.c | 1344 |
1 files changed, 1344 insertions, 0 deletions
diff --git a/app/paint/gimpbrushcore.c b/app/paint/gimpbrushcore.c new file mode 100644 index 0000000..da4f26b --- /dev/null +++ b/app/paint/gimpbrushcore.c @@ -0,0 +1,1344 @@ +/* GIMP - The GNU Image Manipulation Program + * 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 "libgimpmath/gimpmath.h" + +#include "paint-types.h" + +#include "operations/layer-modes/gimp-layer-modes.h" + +#include "gegl/gimp-babl.h" +#include "gegl/gimp-gegl-loops.h" + +#include "core/gimpbrush-header.h" +#include "core/gimpbrushgenerated.h" +#include "core/gimpdrawable.h" +#include "core/gimpdynamics.h" +#include "core/gimpdynamicsoutput.h" +#include "core/gimperror.h" +#include "core/gimpimage.h" +#include "core/gimpmarshal.h" +#include "core/gimpsymmetry.h" +#include "core/gimptempbuf.h" + +#include "gimpbrushcore.h" +#include "gimpbrushcore-loops.h" +#include "gimpbrushcore-kernels.h" + +#include "gimppaintoptions.h" + +#include "gimp-intl.h" + + +#define EPSILON 0.00001 + +enum +{ + SET_BRUSH, + SET_DYNAMICS, + LAST_SIGNAL +}; + + +/* local function prototypes */ + +static void gimp_brush_core_finalize (GObject *object); + +static gboolean gimp_brush_core_start (GimpPaintCore *core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + const GimpCoords *coords, + GError **error); +static gboolean gimp_brush_core_pre_paint (GimpPaintCore *core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + GimpPaintState paint_state, + guint32 time); +static void gimp_brush_core_post_paint (GimpPaintCore *core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + GimpPaintState paint_state, + guint32 time); +static void gimp_brush_core_interpolate (GimpPaintCore *core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + guint32 time); + +static GeglBuffer * gimp_brush_core_get_paint_buffer(GimpPaintCore *paint_core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + GimpLayerMode paint_mode, + const GimpCoords *coords, + gint *paint_buffer_x, + gint *paint_buffer_y, + gint *paint_width, + gint *paint_height); + +static void gimp_brush_core_real_set_brush (GimpBrushCore *core, + GimpBrush *brush); +static void gimp_brush_core_real_set_dynamics (GimpBrushCore *core, + GimpDynamics *dynamics); + +static gdouble gimp_brush_core_get_angle (GimpBrushCore *core); +static gboolean gimp_brush_core_get_reflect (GimpBrushCore *core); + +static const GimpTempBuf * + gimp_brush_core_transform_mask (GimpBrushCore *core, + GimpBrush *brush); + +static void gimp_brush_core_invalidate_cache (GimpBrush *brush, + GimpBrushCore *core); + + +G_DEFINE_TYPE (GimpBrushCore, gimp_brush_core, GIMP_TYPE_PAINT_CORE) + +#define parent_class gimp_brush_core_parent_class + +static guint core_signals[LAST_SIGNAL] = { 0, }; + + +static void +gimp_brush_core_class_init (GimpBrushCoreClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GimpPaintCoreClass *paint_core_class = GIMP_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 (GimpBrushCoreClass, set_brush), + NULL, NULL, + gimp_marshal_VOID__OBJECT, + G_TYPE_NONE, 1, + GIMP_TYPE_BRUSH); + + core_signals[SET_DYNAMICS] = + g_signal_new ("set-dynamics", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (GimpBrushCoreClass, set_dynamics), + NULL, NULL, + gimp_marshal_VOID__OBJECT, + G_TYPE_NONE, 1, + GIMP_TYPE_DYNAMICS); + + object_class->finalize = gimp_brush_core_finalize; + + paint_core_class->start = gimp_brush_core_start; + paint_core_class->pre_paint = gimp_brush_core_pre_paint; + paint_core_class->post_paint = gimp_brush_core_post_paint; + paint_core_class->interpolate = gimp_brush_core_interpolate; + paint_core_class->get_paint_buffer = gimp_brush_core_get_paint_buffer; + + klass->handles_changing_brush = FALSE; + klass->handles_transforming_brush = TRUE; + klass->handles_dynamic_transforming_brush = TRUE; + + klass->set_brush = gimp_brush_core_real_set_brush; + klass->set_dynamics = gimp_brush_core_real_set_dynamics; +} + +static void +gimp_brush_core_init (GimpBrushCore *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 (gimp_deg_to_rad (i * 360 / + BRUSH_CORE_JITTER_LUTSIZE)); + core->jitter_lut_x[i] = sin (gimp_deg_to_rad (i * 360 / + BRUSH_CORE_JITTER_LUTSIZE)); + } + + gimp_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 +gimp_brush_core_finalize (GObject *object) +{ + GimpBrushCore *core = GIMP_BRUSH_CORE (object); + gint i, j; + + g_clear_pointer (&core->pressure_brush, gimp_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], gimp_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], gimp_temp_buf_unref); + + if (core->main_brush) + { + g_signal_handlers_disconnect_by_func (core->main_brush, + gimp_brush_core_invalidate_cache, + core); + gimp_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 +gimp_brush_core_pre_paint (GimpPaintCore *paint_core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + GimpPaintState paint_state, + guint32 time) +{ + GimpBrushCore *core = GIMP_BRUSH_CORE (paint_core); + + if (paint_state == GIMP_PAINT_STATE_MOTION) + { + GimpCoords last_coords; + GimpCoords current_coords; + gdouble scale; + + gimp_paint_core_get_last_coords (paint_core, &last_coords); + gimp_paint_core_get_current_coords (paint_core, ¤t_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 && + ! gimp_brush_want_null_motion (core->main_brush, + &last_coords, + ¤t_coords)) + { + return FALSE; + } + /*No drawing anything if the scale is too small*/ + if (GIMP_BRUSH_CORE_GET_CLASS (core)->handles_transforming_brush) + { + GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable)); + gdouble fade_point; + + if (GIMP_BRUSH_CORE_GET_CLASS (core)->handles_dynamic_transforming_brush) + { + gdouble width; + gdouble height; + + fade_point = gimp_paint_options_get_fade (paint_options, image, + paint_core->pixel_dist); + width = gimp_brush_get_width (core->main_brush); + height = gimp_brush_get_height (core->main_brush); + + scale = paint_options->brush_size / + MAX (width, height) * + gimp_dynamics_get_linear_value (core->dynamics, + GIMP_DYNAMICS_OUTPUT_SIZE, + ¤t_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)) > GIMP_BRUSH_MAX_SIZE) + { + scale = GIMP_BRUSH_MAX_SIZE / MAX (width, height); + } + } + + if (scale < 0.0000001) + return FALSE; + } + } + + if (GIMP_BRUSH_CORE_GET_CLASS (paint_core)->handles_changing_brush) + { + core->brush = gimp_brush_select_brush (core->main_brush, + &last_coords, + ¤t_coords); + } + if ((! GIMP_IS_BRUSH_GENERATED(core->main_brush)) && + (paint_options->brush_hardness != gimp_brush_get_blur_hardness(core->main_brush))) + { + gimp_brush_flush_blur_caches(core->main_brush); + } + } + + return TRUE; +} + +static void +gimp_brush_core_post_paint (GimpPaintCore *paint_core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + GimpPaintState paint_state, + guint32 time) +{ + GimpBrushCore *core = GIMP_BRUSH_CORE (paint_core); + + if (paint_state == GIMP_PAINT_STATE_MOTION) + { + core->brush = core->main_brush; + } +} + +static gboolean +gimp_brush_core_start (GimpPaintCore *paint_core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + const GimpCoords *coords, + GError **error) +{ + GimpBrushCore *core = GIMP_BRUSH_CORE (paint_core); + GimpContext *context = GIMP_CONTEXT (paint_options); + + gimp_brush_core_set_brush (core, gimp_context_get_brush (context)); + + gimp_brush_core_set_dynamics (core, gimp_context_get_dynamics (context)); + + if (! core->main_brush) + { + g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED, + _("No brushes available for use with this tool.")); + return FALSE; + } + + if (! core->dynamics) + { + g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED, + _("No paint dynamics available for use with this tool.")); + return FALSE; + } + + if (GIMP_BRUSH_CORE_GET_CLASS (core)->handles_transforming_brush) + { + gimp_brush_core_eval_transform_dynamics (core, + drawable, + paint_options, + coords); + + gimp_brush_core_eval_transform_symmetry (core, NULL, 0); + } + + core->spacing = paint_options->brush_spacing; + + core->brush = core->main_brush; + + core->jitter = + gimp_paint_options_get_jitter (paint_options, + gimp_item_get_image (GIMP_ITEM (drawable))); + + return TRUE; +} + +/** + * gimp_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 +gimp_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 +gimp_brush_core_interpolate (GimpPaintCore *paint_core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + guint32 time) +{ + GimpBrushCore *core = GIMP_BRUSH_CORE (paint_core); + GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable)); + GimpDynamicsOutput *spacing_output; + GimpCoords last_coords; + GimpCoords current_coords; + GimpVector2 delta_vec; + gdouble delta_pressure; + gdouble delta_xtilt, delta_ytilt; + gdouble delta_wheel; + gdouble delta_velocity; + gdouble temp_direction; + GimpVector2 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 (GIMP_IS_BRUSH (core->brush)); + + gimp_paint_core_get_last_coords (paint_core, &last_coords); + gimp_paint_core_get_current_coords (paint_core, ¤t_coords); + + gimp_avoid_exact_integer (&last_coords.x); + gimp_avoid_exact_integer (&last_coords.y); + gimp_avoid_exact_integer (¤t_coords.x); + gimp_avoid_exact_integer (¤t_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 = gimp_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) + { + gimp_paint_core_set_last_coords (paint_core, ¤t_coords); + + gimp_paint_core_paint (paint_core, drawable, paint_options, + GIMP_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 = gimp_dynamics_get_output (core->dynamics, + GIMP_DYNAMICS_OUTPUT_SPACING); + + fade_point = gimp_paint_options_get_fade (paint_options, image, + paint_core->pixel_dist); + + use_dyn_spacing = gimp_dynamics_output_is_enabled (spacing_output); + + if (use_dyn_spacing) + { + dyn_spacing = gimp_dynamics_output_get_linear_value (spacing_output, + ¤t_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 = gimp_brush_get_x_axis (core->brush); + gimp_vector2_mul (&temp_vec, core->scale); + gimp_vector2_rotate (&temp_vec, core->angle * G_PI * 2); + + mag = gimp_vector2_length (&temp_vec); + xd = gimp_vector2_inner_product (&delta_vec, &temp_vec) / (mag * mag); + + temp_vec = gimp_brush_get_y_axis (core->brush); + gimp_vector2_mul (&temp_vec, core->scale); + gimp_vector2_rotate (&temp_vec, core->angle * G_PI * 2); + + mag = gimp_vector2_length (&temp_vec); + yd = gimp_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; + + gimp_paint_core_set_current_coords (paint_core, ¤t_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) + { + GimpVector2 x_axis; + GimpVector2 y_axis; + gdouble dyn_jitter; + gdouble jitter_dist; + gint32 jitter_angle; + + x_axis = gimp_brush_get_x_axis (core->brush); + y_axis = gimp_brush_get_y_axis (core->brush); + + dyn_jitter = (core->jitter * + gimp_dynamics_get_linear_value (core->dynamics, + GIMP_DYNAMICS_OUTPUT_JITTER, + ¤t_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; + } + + gimp_paint_core_set_current_coords (paint_core, ¤t_coords); + + paint_core->distance = initial + t * dist; + paint_core->pixel_dist = pixel_initial + t * pixel_dist; + + gimp_paint_core_paint (paint_core, drawable, paint_options, + GIMP_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; + + gimp_paint_core_set_current_coords (paint_core, ¤t_coords); + gimp_paint_core_set_last_coords (paint_core, ¤t_coords); + + paint_core->distance = total; + paint_core->pixel_dist = pixel_initial + pixel_dist; +} + +static GeglBuffer * +gimp_brush_core_get_paint_buffer (GimpPaintCore *paint_core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + GimpLayerMode paint_mode, + const GimpCoords *coords, + gint *paint_buffer_x, + gint *paint_buffer_y, + gint *paint_width, + gint *paint_height) +{ + GimpBrushCore *core = GIMP_BRUSH_CORE (paint_core); + gint x, y; + gint x1, y1, x2, y2; + gint drawable_width, drawable_height; + gint brush_width, brush_height; + + gimp_brush_transform_size (core->brush, + core->scale, core->aspect_ratio, + gimp_brush_core_get_angle (core), + gimp_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); + + drawable_width = gimp_item_get_width (GIMP_ITEM (drawable)); + drawable_height = gimp_item_get_height (GIMP_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)) + { + GimpTempBuf *temp_buf; + const Babl *format; + GimpLayerCompositeMode composite_mode; + + composite_mode = gimp_layer_mode_get_paint_composite_mode (paint_mode); + + format = gimp_layer_mode_get_format (paint_mode, + GIMP_LAYER_COLOR_SPACE_AUTO, + GIMP_LAYER_COLOR_SPACE_AUTO, + composite_mode, + gimp_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 = gimp_temp_buf_new ((x2 - x1), (y2 - y1), + format); + + *paint_buffer_x = x1; + *paint_buffer_y = y1; + + paint_core->paint_buffer = gimp_temp_buf_create_buffer (temp_buf); + + gimp_temp_buf_unref (temp_buf); + + return paint_core->paint_buffer; + } + + return NULL; +} + +static void +gimp_brush_core_real_set_brush (GimpBrushCore *core, + GimpBrush *brush) +{ + if (brush == core->main_brush) + return; + + if (core->main_brush) + { + g_signal_handlers_disconnect_by_func (core->main_brush, + gimp_brush_core_invalidate_cache, + core); + gimp_brush_end_use (core->main_brush); + } + + g_set_object (&core->main_brush, brush); + + if (core->main_brush) + { + gimp_brush_begin_use (core->main_brush); + g_signal_connect (core->main_brush, "invalidate-preview", + G_CALLBACK (gimp_brush_core_invalidate_cache), + core); + } +} + +static void +gimp_brush_core_real_set_dynamics (GimpBrushCore *core, + GimpDynamics *dynamics) +{ + g_set_object (&core->dynamics, dynamics); +} + +void +gimp_brush_core_set_brush (GimpBrushCore *core, + GimpBrush *brush) +{ + g_return_if_fail (GIMP_IS_BRUSH_CORE (core)); + g_return_if_fail (brush == NULL || GIMP_IS_BRUSH (brush)); + + if (brush != core->main_brush) + g_signal_emit (core, core_signals[SET_BRUSH], 0, brush); +} + +void +gimp_brush_core_set_dynamics (GimpBrushCore *core, + GimpDynamics *dynamics) +{ + g_return_if_fail (GIMP_IS_BRUSH_CORE (core)); + g_return_if_fail (dynamics == NULL || GIMP_IS_DYNAMICS (dynamics)); + + if (dynamics != core->dynamics) + g_signal_emit (core, core_signals[SET_DYNAMICS], 0, dynamics); +} + +void +gimp_brush_core_paste_canvas (GimpBrushCore *core, + GimpDrawable *drawable, + const GimpCoords *coords, + gdouble brush_opacity, + gdouble image_opacity, + GimpLayerMode paint_mode, + GimpBrushApplicationMode brush_hardness, + gdouble dynamic_force, + GimpPaintApplicationMode mode) +{ + const GimpTempBuf *brush_mask; + + brush_mask = gimp_brush_core_get_brush_mask (core, coords, + brush_hardness, + dynamic_force); + + if (brush_mask) + { + GimpPaintCore *paint_core = GIMP_PAINT_CORE (core); + gint x; + gint y; + gint off_x; + gint off_y; + + x = (gint) floor (coords->x) - (gimp_temp_buf_get_width (brush_mask) >> 1); + y = (gint) floor (coords->y) - (gimp_temp_buf_get_height (brush_mask) >> 1); + + off_x = (x < 0) ? -x : 0; + off_y = (y < 0) ? -y : 0; + + gimp_paint_core_paste (paint_core, brush_mask, + off_x, off_y, + drawable, + brush_opacity, + image_opacity, + paint_mode, + mode); + } +} + +/* Similar to gimp_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 +gimp_brush_core_replace_canvas (GimpBrushCore *core, + GimpDrawable *drawable, + const GimpCoords *coords, + gdouble brush_opacity, + gdouble image_opacity, + GimpBrushApplicationMode brush_hardness, + gdouble dynamic_force, + GimpPaintApplicationMode mode) +{ + const GimpTempBuf *brush_mask; + + brush_mask = gimp_brush_core_get_brush_mask (core, coords, + brush_hardness, + dynamic_force); + + if (brush_mask) + { + GimpPaintCore *paint_core = GIMP_PAINT_CORE (core); + gint x; + gint y; + gint off_x; + gint off_y; + + x = (gint) floor (coords->x) - (gimp_temp_buf_get_width (brush_mask) >> 1); + y = (gint) floor (coords->y) - (gimp_temp_buf_get_height (brush_mask) >> 1); + + off_x = (x < 0) ? -x : 0; + off_y = (y < 0) ? -y : 0; + + gimp_paint_core_replace (paint_core, brush_mask, + off_x, off_y, + drawable, + brush_opacity, + image_opacity, + mode); + } +} + + +static void +gimp_brush_core_invalidate_cache (GimpBrush *brush, + GimpBrushCore *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 +gimp_brush_core_get_angle (GimpBrushCore *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 +gimp_brush_core_get_reflect (GimpBrushCore *core) +{ + return core->reflect ^ core->symmetry_reflect; +} + +static const GimpTempBuf * +gimp_brush_core_transform_mask (GimpBrushCore *core, + GimpBrush *brush) +{ + const GimpTempBuf *mask; + + if (core->scale <= 0.0) + return NULL; + + mask = gimp_brush_transform_mask (brush, + core->scale, + core->aspect_ratio, + gimp_brush_core_get_angle (core), + gimp_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 GimpTempBuf * +gimp_brush_core_get_brush_mask (GimpBrushCore *core, + const GimpCoords *coords, + GimpBrushApplicationMode brush_hardness, + gdouble dynamic_force) +{ + const GimpTempBuf *mask; + + if (dynamic_force <= 0.0) + return NULL; + + mask = gimp_brush_core_transform_mask (core, core->brush); + + if (! mask) + return NULL; + + switch (brush_hardness) + { + case GIMP_BRUSH_SOFT: + return gimp_brush_core_subsample_mask (core, mask, + coords->x, + coords->y); + break; + + case GIMP_BRUSH_HARD: + return gimp_brush_core_solidify_mask (core, mask, + coords->x, + coords->y); + break; + + case GIMP_BRUSH_PRESSURE: + return gimp_brush_core_pressurize_mask (core, mask, + coords->x, + coords->y, + dynamic_force); + break; + } + + g_return_val_if_reached (NULL); +} + +const GimpTempBuf * +gimp_brush_core_get_brush_pixmap (GimpBrushCore *core) +{ + const GimpTempBuf *pixmap; + + if (core->scale <= 0.0) + return NULL; + + pixmap = gimp_brush_transform_pixmap (core->brush, + core->scale, + core->aspect_ratio, + gimp_brush_core_get_angle (core), + gimp_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 +gimp_brush_core_eval_transform_dynamics (GimpBrushCore *core, + GimpDrawable *drawable, + GimpPaintOptions *paint_options, + const GimpCoords *coords) +{ + if (core->main_brush) + { + gdouble max_side; + + max_side = MAX (gimp_brush_get_width (core->main_brush), + gimp_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) > GIMP_BRUSH_MAX_SIZE) + { + core->scale = GIMP_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 (! GIMP_IS_DYNAMICS (core->dynamics)) + return; + + if (GIMP_BRUSH_CORE_GET_CLASS (core)->handles_dynamic_transforming_brush) + { + gdouble fade_point = 1.0; + + if (drawable) + { + GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable)); + GimpPaintCore *paint_core = GIMP_PAINT_CORE (core); + + fade_point = gimp_paint_options_get_fade (paint_options, image, + paint_core->pixel_dist); + } + + core->scale *= gimp_dynamics_get_linear_value (core->dynamics, + GIMP_DYNAMICS_OUTPUT_SIZE, + coords, + paint_options, + fade_point); + + core->angle += gimp_dynamics_get_angular_value (core->dynamics, + GIMP_DYNAMICS_OUTPUT_ANGLE, + coords, + paint_options, + fade_point); + + core->hardness *= gimp_dynamics_get_linear_value (core->dynamics, + GIMP_DYNAMICS_OUTPUT_HARDNESS, + coords, + paint_options, + fade_point); + + if (gimp_dynamics_is_output_enabled (core->dynamics, + GIMP_DYNAMICS_OUTPUT_ASPECT_RATIO)) + { + gdouble dyn_aspect; + + dyn_aspect = gimp_dynamics_get_aspect_value (core->dynamics, + GIMP_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 +gimp_brush_core_eval_transform_symmetry (GimpBrushCore *core, + GimpSymmetry *symmetry, + gint stroke) +{ + g_return_if_fail (GIMP_IS_BRUSH_CORE (core)); + g_return_if_fail (symmetry == NULL || GIMP_IS_SYMMETRY (symmetry)); + + core->symmetry_angle = 0.0; + core->symmetry_reflect = FALSE; + + if (symmetry) + { + gimp_symmetry_get_transform (symmetry, + stroke, + &core->symmetry_angle, + &core->symmetry_reflect); + + core->symmetry_angle /= 360.0; + } +} + +void +gimp_brush_core_color_area_with_pixmap (GimpBrushCore *core, + GimpDrawable *drawable, + const GimpCoords *coords, + GeglBuffer *area, + gint area_x, + gint area_y, + gboolean apply_mask) +{ + const GimpTempBuf *pixmap; + GeglBuffer *pixmap_buffer; + const GimpTempBuf *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 (GIMP_IS_BRUSH (core->brush)); + g_return_if_fail (gimp_brush_get_pixmap (core->brush) != NULL); + + /* scale the brush */ + pixmap = gimp_brush_core_get_brush_pixmap (core); + + if (! pixmap) + return; + + if (apply_mask) + mask = gimp_brush_core_transform_mask (core, core->brush); + else + mask = NULL; + + /* Calculate upper left corner of brush as in + * gimp_paint_core_get_paint_area. Ugly to have to do this here, too. + */ + ul_x = (gint) floor (coords->x) - (gimp_temp_buf_get_width (pixmap) >> 1); + ul_y = (gint) floor (coords->y) - (gimp_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 (gimp_temp_buf_get_width (pixmap) % 2 == 0) + ul_x += ROUND (coords->x) - floor (coords->x); + if (gimp_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 = gimp_temp_buf_create_buffer (pixmap); + + gimp_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 = gimp_temp_buf_create_buffer (mask); + + gimp_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); + } +} |