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gimp/app/paint/gimpbrushcore.c

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/* The GIMP -- an 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <glib-object.h>
#include "paint-types.h"
#include "base/brush-scale.h"
#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "core/gimpbrush.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimpmarshal.h"
#include "gimpbrushcore.h"
#include "gimpbrushcore-kernels.h"
#include "gimppaintoptions.h"
#include "gimp-intl.h"
#define EPSILON 0.00001
enum
{
SET_BRUSH,
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,
GimpCoords *coords);
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 TempBuf *gimp_brush_core_get_paint_area (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options);
static void gimp_brush_core_real_set_brush (GimpBrushCore *core,
GimpBrush *brush);
static void gimp_brush_core_calc_brush_size (GimpBrushCore *core,
MaskBuf *mask,
gdouble scale,
gint *width,
gint *height);
static inline void rotate_pointers (gulong **p,
guint32 n);
static MaskBuf * gimp_brush_core_subsample_mask (GimpBrushCore *core,
MaskBuf *mask,
gdouble x,
gdouble y);
static MaskBuf * gimp_brush_core_pressurize_mask (GimpBrushCore *core,
MaskBuf *brush_mask,
gdouble x,
gdouble y,
gdouble pressure);
static MaskBuf * gimp_brush_core_solidify_mask (GimpBrushCore *core,
MaskBuf *brush_mask,
gdouble x,
gdouble y);
static MaskBuf * gimp_brush_core_scale_mask (GimpBrushCore *core,
MaskBuf *brush_mask,
gdouble scale);
static MaskBuf * gimp_brush_core_scale_pixmap (GimpBrushCore *core,
MaskBuf *brush_mask,
gdouble scale);
static MaskBuf * gimp_brush_core_get_brush_mask (GimpBrushCore *core,
GimpBrushApplicationMode brush_hardness,
gdouble scale);
static void gimp_brush_core_invalidate_cache (GimpBrush *brush,
GimpBrushCore *core);
/* brush pipe utility functions */
static void paint_line_pixmap_mask (GimpImage *dest,
GimpDrawable *drawable,
TempBuf *pixmap_mask,
TempBuf *brush_mask,
guchar *d,
gint x,
gint y,
gint bytes,
gint width,
GimpBrushApplicationMode mode);
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);
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_area = gimp_brush_core_get_paint_area;
klass->handles_changing_brush = FALSE;
klass->use_scale = TRUE;
klass->set_brush = gimp_brush_core_real_set_brush;
}
static void
gimp_brush_core_init (GimpBrushCore *core)
{
gint i, j;
core->main_brush = NULL;
core->brush = NULL;
core->spacing = 1.0;
core->scale = 1.0;
core->pressure_brush = NULL;
for (i = 0; i < BRUSH_CORE_SOLID_SUBSAMPLE; i++)
for (j = 0; j < BRUSH_CORE_SOLID_SUBSAMPLE; j++)
core->solid_brushes[i][j] = NULL;
core->last_solid_brush = NULL;
core->solid_cache_invalid = FALSE;
core->scale_brush = NULL;
core->last_scale_brush = NULL;
core->last_scale_width = 0;
core->last_scale_height = 0;
core->scale_pixmap = NULL;
core->last_scale_pixmap = NULL;
core->last_scale_pixmap_width = 0;
core->last_scale_pixmap_height = 0;
g_assert (BRUSH_CORE_SUBSAMPLE == KERNEL_SUBSAMPLE);
for (i = 0; i < KERNEL_SUBSAMPLE + 1; i++)
for (j = 0; j < KERNEL_SUBSAMPLE + 1; j++)
core->kernel_brushes[i][j] = NULL;
core->last_brush_mask = NULL;
core->cache_invalid = FALSE;
core->brush_bound_segs = NULL;
core->n_brush_bound_segs = 0;
core->brush_bound_width = 0;
core->brush_bound_height = 0;
}
static void
gimp_brush_core_finalize (GObject *object)
{
GimpBrushCore *core = GIMP_BRUSH_CORE (object);
gint i, j;
if (core->pressure_brush)
{
temp_buf_free (core->pressure_brush);
core->pressure_brush = NULL;
}
for (i = 0; i < BRUSH_CORE_SOLID_SUBSAMPLE; i++)
for (j = 0; j < BRUSH_CORE_SOLID_SUBSAMPLE; j++)
if (core->solid_brushes[i][j])
{
temp_buf_free (core->solid_brushes[i][j]);
core->solid_brushes[i][j] = NULL;
}
if (core->scale_brush)
{
temp_buf_free (core->scale_brush);
core->scale_brush = NULL;
}
if (core->scale_pixmap)
{
temp_buf_free (core->scale_pixmap);
core->scale_pixmap = NULL;
}
for (i = 0; i < KERNEL_SUBSAMPLE + 1; i++)
for (j = 0; j < KERNEL_SUBSAMPLE + 1; j++)
if (core->kernel_brushes[i][j])
{
temp_buf_free (core->kernel_brushes[i][j]);
core->kernel_brushes[i][j] = NULL;
}
if (core->main_brush)
{
g_signal_handlers_disconnect_by_func (core->main_brush,
gimp_brush_core_invalidate_cache,
core);
g_object_unref (core->main_brush);
core->main_brush = NULL;
}
if (core->brush_bound_segs)
{
g_free (core->brush_bound_segs);
core->brush_bound_segs = NULL;
core->n_brush_bound_segs = 0;
core->brush_bound_width = 0;
core->brush_bound_height = 0;
}
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)
{
/* 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 (paint_core->last_coords.x == paint_core->cur_coords.x &&
paint_core->last_coords.y == paint_core->cur_coords.y &&
! gimp_brush_want_null_motion (core->main_brush,
&paint_core->last_coords,
&paint_core->cur_coords))
{
return FALSE;
}
if (GIMP_BRUSH_CORE_GET_CLASS (paint_core)->handles_changing_brush)
{
core->brush = gimp_brush_select_brush (core->main_brush,
&paint_core->last_coords,
&paint_core->cur_coords);
}
}
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,
GimpCoords *coords)
{
GimpBrushCore *core = GIMP_BRUSH_CORE (paint_core);
GimpBrush *brush;
brush = gimp_context_get_brush (GIMP_CONTEXT (paint_options));
if (core->main_brush != brush)
gimp_brush_core_set_brush (core, brush);
if (! core->main_brush)
{
g_message (_("No brushes available for use with this tool."));
return FALSE;
}
core->spacing = (gdouble) gimp_brush_get_spacing (core->main_brush) / 100.0;
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)
{
gdouble integral = floor (*x);
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);
GimpVector2 delta_vec;
gdouble delta_pressure;
gdouble delta_xtilt, delta_ytilt;
gdouble delta_wheel;
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;
gimp_avoid_exact_integer (&paint_core->last_coords.x);
gimp_avoid_exact_integer (&paint_core->last_coords.y);
gimp_avoid_exact_integer (&paint_core->cur_coords.x);
gimp_avoid_exact_integer (&paint_core->cur_coords.y);
delta_vec.x = paint_core->cur_coords.x - paint_core->last_coords.x;
delta_vec.y = paint_core->cur_coords.y - paint_core->last_coords.y;
delta_pressure = paint_core->cur_coords.pressure - paint_core->last_coords.pressure;
delta_xtilt = paint_core->cur_coords.xtilt - paint_core->last_coords.xtilt;
delta_ytilt = paint_core->cur_coords.ytilt - paint_core->last_coords.ytilt;
delta_wheel = paint_core->cur_coords.wheel - paint_core->last_coords.wheel;
/* return if there has been no motion */
if (! delta_vec.x &&
! delta_vec.y &&
! delta_pressure &&
! delta_xtilt &&
! delta_ytilt &&
! delta_wheel)
return;
/* calculate the distance traveled in the coordinate space of the brush */
mag = gimp_vector2_length (&(core->brush->x_axis));
xd = gimp_vector2_inner_product (&delta_vec,
&(core->brush->x_axis)) / (mag * mag);
mag = gimp_vector2_length (&(core->brush->y_axis));
yd = gimp_vector2_inner_product (&delta_vec,
&(core->brush->y_axis)) / (mag * mag);
dist = 0.5 * sqrt (xd * xd + yd * yd);
total = dist + paint_core->distance;
initial = paint_core->distance;
pixel_dist = gimp_vector2_length (&delta_vec);
pixel_initial = paint_core->pixel_dist;
/* FIXME: need to adapt the spacing to the size */
/* lastscale = MIN (gimp_paint_tool->lastpressure, 1/256); */
/* curscale = MIN (gimp_paint_tool->curpressure, 1/256); */
/* spacing = */
/* gimp_paint_tool->spacing * sqrt (0.5 * (lastscale + curscale)); */
/* Compute spacing parameters such that a brush position will be
* made each time the line crosses the *center* of a pixel row or
* column, according to whether the line is mostly horizontal or
* mostly vertical. The term "stripe" will mean "column" if the
* line is horizontalish; "row" if the line is verticalish.
*
* We start by deriving coefficients for a new parameter 's':
* s = t * st_factor + st_offset
* such that the "nice" brush positions are the ones with *integer*
* s values. (Actually the value of s will be 1/2 less than the nice
* brush position's x or y coordinate - note that st_factor may
* be negative!)
*/
if (delta_vec.x * delta_vec.x > delta_vec.y * delta_vec.y)
{
st_factor = delta_vec.x;
st_offset = paint_core->last_coords.x - 0.5;
}
else
{
st_factor = delta_vec.y;
st_offset = paint_core->last_coords.y - 0.5;
}
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.
*/
paint_core->cur_coords.x = paint_core->last_coords.x;
paint_core->cur_coords.y = paint_core->last_coords.y;
/* ... 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 (paint_core->last_coords.x + t0 * delta_vec.x);
y = (gint) floor (paint_core->last_coords.y + t0 * delta_vec.y);
if (t0 < 0.0 && !( x == (gint) floor (paint_core->last_coords.x) &&
y == (gint) floor (paint_core->last_coords.y) ))
{
/* Exception A: If the first stripe's brush position is
* EXTRApolated into a different pixel square than the
* ideal starting point, dont'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 (paint_core->last_coords.x + tn * delta_vec.x);
y = (gint) floor (paint_core->last_coords.y + tn * delta_vec.y);
if (tn > 1.0 && !( x == (gint) floor (paint_core->cur_coords.x) &&
y == (gint) floor (paint_core->cur_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;
paint_core->cur_coords.x = (paint_core->last_coords.x +
t * delta_vec.x);
paint_core->cur_coords.y = (paint_core->last_coords.y +
t * delta_vec.y);
paint_core->cur_coords.pressure = (paint_core->last_coords.pressure +
p * delta_pressure);
paint_core->cur_coords.xtilt = (paint_core->last_coords.xtilt +
p * delta_xtilt);
paint_core->cur_coords.ytilt = (paint_core->last_coords.ytilt +
p * delta_ytilt);
paint_core->cur_coords.wheel = (paint_core->last_coords.wheel +
p * delta_wheel);
if (core->jitter > 0.0)
{
gdouble jitter_x;
gdouble jitter_y;
jitter_x = g_random_double_range (-core->jitter, core->jitter);
jitter_y = g_random_double_range (-core->jitter, core->jitter);
paint_core->cur_coords.x += jitter_x * core->brush->x_axis.x;
paint_core->cur_coords.y += jitter_y * core->brush->y_axis.y;
}
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);
}
paint_core->cur_coords.x = paint_core->last_coords.x + delta_vec.x;
paint_core->cur_coords.y = paint_core->last_coords.y + delta_vec.y;
paint_core->cur_coords.pressure = paint_core->last_coords.pressure + delta_pressure;
paint_core->cur_coords.xtilt = paint_core->last_coords.xtilt + delta_xtilt;
paint_core->cur_coords.ytilt = paint_core->last_coords.ytilt + delta_ytilt;
paint_core->cur_coords.wheel = paint_core->last_coords.wheel + delta_wheel;
paint_core->distance = total;
paint_core->pixel_dist = pixel_initial + pixel_dist;
paint_core->last_coords = paint_core->cur_coords;
}
static TempBuf *
gimp_brush_core_get_paint_area (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
GimpBrushCore *core = GIMP_BRUSH_CORE (paint_core);
gint x, y;
gint x1, y1, x2, y2;
gint bytes;
gint drawable_width, drawable_height;
gint brush_width, brush_height;
bytes = gimp_drawable_bytes_with_alpha (drawable);
if (GIMP_BRUSH_CORE_GET_CLASS (core)->use_scale)
{
GimpPressureOptions *pressure_options = paint_options->pressure_options;
if (pressure_options->inverse_size)
core->scale = 1.0 - 0.9 * paint_core->cur_coords.pressure;
else if (pressure_options->size)
core->scale = paint_core->cur_coords.pressure;
else
core->scale = 1.0;
}
gimp_brush_core_calc_brush_size (core, core->brush->mask, core->scale,
&brush_width, &brush_height);
/* adjust the x and y coordinates to the upper left corner of the brush */
x = (gint) floor (paint_core->cur_coords.x) - (brush_width >> 1);
y = (gint) floor (paint_core->cur_coords.y) - (brush_height >> 1);
drawable_width = gimp_item_width (GIMP_ITEM (drawable));
drawable_height = gimp_item_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))
paint_core->canvas_buf = temp_buf_resize (paint_core->canvas_buf, bytes,
x1, y1,
(x2 - x1), (y2 - y1));
else
return NULL;
return paint_core->canvas_buf;
}
static void
gimp_brush_core_real_set_brush (GimpBrushCore *core,
GimpBrush *brush)
{
if (core->main_brush)
{
g_signal_handlers_disconnect_by_func (core->main_brush,
gimp_brush_core_invalidate_cache,
core);
g_object_unref (core->main_brush);
core->main_brush = NULL;
}
if (core->brush_bound_segs)
{
g_free (core->brush_bound_segs);
core->brush_bound_segs = NULL;
core->n_brush_bound_segs = 0;
core->brush_bound_width = 0;
core->brush_bound_height = 0;
}
core->main_brush = brush;
if (core->main_brush)
{
g_object_ref (core->main_brush);
g_signal_connect (core->main_brush, "invalidate-preview",
G_CALLBACK (gimp_brush_core_invalidate_cache),
core);
}
}
void
gimp_brush_core_set_brush (GimpBrushCore *core,
GimpBrush *brush)
{
g_signal_emit (core, core_signals[SET_BRUSH], 0, brush);
}
void
gimp_brush_core_paste_canvas (GimpBrushCore *core,
GimpDrawable *drawable,
gdouble brush_opacity,
gdouble image_opacity,
GimpLayerModeEffects paint_mode,
GimpBrushApplicationMode brush_hardness,
GimpPaintApplicationMode mode)
{
MaskBuf *brush_mask = gimp_brush_core_get_brush_mask (core,
brush_hardness,
core->scale);
if (brush_mask)
{
GimpPaintCore *paint_core = GIMP_PAINT_CORE (core);
PixelRegion brush_maskPR;
gint x;
gint y;
gint off_x;
gint off_y;
x = (gint) floor (paint_core->cur_coords.x) - (brush_mask->width >> 1);
y = (gint) floor (paint_core->cur_coords.y) - (brush_mask->height >> 1);
off_x = (x < 0) ? -x : 0;
off_y = (y < 0) ? -y : 0;
pixel_region_init_temp_buf (&brush_maskPR, brush_mask,
off_x, off_y,
paint_core->canvas_buf->width,
paint_core->canvas_buf->height);
gimp_paint_core_paste (paint_core, &brush_maskPR, 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,
gdouble brush_opacity,
gdouble image_opacity,
GimpBrushApplicationMode brush_hardness,
GimpPaintApplicationMode mode)
{
MaskBuf *brush_mask = gimp_brush_core_get_brush_mask (core,
brush_hardness,
core->scale);
if (brush_mask)
{
GimpPaintCore *paint_core = GIMP_PAINT_CORE (core);
PixelRegion brush_maskPR;
gint x;
gint y;
gint off_x;
gint off_y;
x = (gint) floor (paint_core->cur_coords.x) - (brush_mask->width >> 1);
y = (gint) floor (paint_core->cur_coords.y) - (brush_mask->height >> 1);
off_x = (x < 0) ? -x : 0;
off_y = (y < 0) ? -y : 0;
pixel_region_init_temp_buf (&brush_maskPR, brush_mask,
off_x, off_y,
paint_core->canvas_buf->width,
paint_core->canvas_buf->height);
gimp_paint_core_replace (paint_core, &brush_maskPR, 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->cache_invalid = TRUE;
core->solid_cache_invalid = TRUE;
/* Set the same brush again so the "set-brush" signal is emitted */
gimp_brush_core_set_brush (core, brush);
}
/************************************************************
* LOCAL FUNCTION DEFINITIONS *
************************************************************/
static void
gimp_brush_core_calc_brush_size (GimpBrushCore *core,
MaskBuf *mask,
gdouble scale,
gint *width,
gint *height)
{
scale = CLAMP (scale, 0.0, 1.0);
if (! GIMP_PAINT_CORE (core)->use_pressure)
{
*width = mask->width;
*height = mask->height;
}
else
{
gdouble ratio;
if (scale < 1 / 256)
ratio = 1 / 16;
else
ratio = sqrt (scale);
*width = MAX ((gint) (mask->width * ratio + 0.5), 1);
*height = MAX ((gint) (mask->height * ratio + 0.5), 1);
}
}
static inline void
rotate_pointers (gulong **p,
guint32 n)
{
guint32 i;
gulong *tmp;
tmp = p[0];
for (i = 0; i < n-1; i++)
{
p[i] = p[i+1];
}
p[i] = tmp;
}
static MaskBuf *
gimp_brush_core_subsample_mask (GimpBrushCore *core,
MaskBuf *mask,
gdouble x,
gdouble y)
{
MaskBuf *dest;
gdouble left;
guchar *m;
guchar *d;
const gint *k;
gint index1;
gint index2;
gint dest_offset_x = 0;
gint dest_offset_y = 0;
const gint *kernel;
gint i, j;
gint r, s;
gulong *accum[KERNEL_HEIGHT];
gint offs;
while (x < 0)
x += mask->width;
left = x - floor (x);
index1 = (gint) (left * (gdouble) (KERNEL_SUBSAMPLE + 1));
while (y < 0)
y += mask->height;
left = y - floor (y);
index2 = (gint) (left * (gdouble) (KERNEL_SUBSAMPLE + 1));
if ((mask->width % 2) == 0)
{
index1 += KERNEL_SUBSAMPLE >> 1;
if (index1 > KERNEL_SUBSAMPLE)
{
index1 -= KERNEL_SUBSAMPLE + 1;
dest_offset_x = 1;
}
}
if ((mask->height % 2) == 0)
{
index2 += KERNEL_SUBSAMPLE >> 1;
if (index2 > KERNEL_SUBSAMPLE)
{
index2 -= KERNEL_SUBSAMPLE + 1;
dest_offset_y = 1;
}
}
kernel = subsample[index2][index1];
if (mask == core->last_brush_mask && ! core->cache_invalid)
{
if (core->kernel_brushes[index2][index1])
return core->kernel_brushes[index2][index1];
}
else
{
for (i = 0; i < KERNEL_SUBSAMPLE + 1; i++)
for (j = 0; j < KERNEL_SUBSAMPLE + 1; j++)
if (core->kernel_brushes[i][j])
{
mask_buf_free (core->kernel_brushes[i][j]);
core->kernel_brushes[i][j] = NULL;
}
core->last_brush_mask = mask;
core->cache_invalid = FALSE;
}
dest = mask_buf_new (mask->width + 2,
mask->height + 2);
/* Allocate and initialize the accum buffer */
for (i = 0; i < KERNEL_HEIGHT ; i++)
accum[i] = g_new0 (gulong, dest->width + 1);
core->kernel_brushes[index2][index1] = dest;
m = mask_buf_data (mask);
for (i = 0; i < mask->height; i++)
{
for (j = 0; j < mask->width; j++)
{
k = kernel;
for (r = 0; r < KERNEL_HEIGHT; r++)
{
offs = j + dest_offset_x;
s = KERNEL_WIDTH;
while (s--)
accum[r][offs++] += *m * *k++;
}
m++;
}
/* store the accum buffer into the destination mask */
d = mask_buf_data (dest) + (i + dest_offset_y) * dest->width;
for (j = 0; j < dest->width; j++)
*d++ = (accum[0][j] + 127) / KERNEL_SUM;
rotate_pointers (accum, KERNEL_HEIGHT);
memset (accum[KERNEL_HEIGHT - 1], 0, sizeof (gulong) * dest->width);
}
/* store the rest of the accum buffer into the dest mask */
while (i + dest_offset_y < dest->height)
{
d = mask_buf_data (dest) + (i + dest_offset_y) * dest->width;
for (j = 0; j < dest->width; j++)
*d++ = (accum[0][j] + (KERNEL_SUM / 2)) / KERNEL_SUM;
rotate_pointers (accum, KERNEL_HEIGHT);
i++;
}
for (i = 0; i < KERNEL_HEIGHT ; i++)
g_free (accum[i]);
return dest;
}
/* #define FANCY_PRESSURE */
static MaskBuf *
gimp_brush_core_pressurize_mask (GimpBrushCore *core,
MaskBuf *brush_mask,
gdouble x,
gdouble y,
gdouble pressure)
{
static guchar mapi[256];
guchar *source;
guchar *dest;
MaskBuf *subsample_mask;
gint i;
/* Get the raw subsampled mask */
subsample_mask = gimp_brush_core_subsample_mask (core,
brush_mask,
x, y);
/* Special case pressure = 0.5 */
if ((gint) (pressure * 100 + 0.5) == 50)
return subsample_mask;
if (core->pressure_brush)
mask_buf_free (core->pressure_brush);
core->pressure_brush = mask_buf_new (brush_mask->width + 2,
brush_mask->height + 2);
#ifdef FANCY_PRESSURE
/* Create the pressure profile
*
* It is: I'(I) = tanh (20 * (pressure - 0.5) * I) : pressure > 0.5
* I'(I) = 1 - tanh (20 * (0.5 - pressure) * (1 - I)) : pressure < 0.5
*
* It looks like:
*
* low pressure medium pressure high pressure
*
* | / --
* | / /
* / / |
* -- / |
*/
{
static gdouble map[256];
gdouble ds, s, c;
ds = (pressure - 0.5) * (20.0 / 256.0);
s = 0;
c = 1.0;
if (ds > 0)
{
for (i = 0; i < 256; i++)
{
map[i] = s / c;
s += c * ds;
c += s * ds;
}
for (i = 0; i < 256; i++)
mapi[i] = (gint) (255 * map[i] / map[255]);
}
else
{
ds = -ds;
for (i = 255; i >= 0; i--)
{
map[i] = s / c;
s += c * ds;
c += s * ds;
}
for (i = 0; i < 256; i++)
mapi[i] = (gint) (255 * (1 - map[i] / map[0]));
}
#else /* ! FANCY_PRESSURE */
{
gdouble j, k;
j = pressure + pressure;
k = 0;
for (i = 0; i < 256; i++)
{
if (k > 255)
mapi[i] = 255;
else
mapi[i] = (guchar) k;
k += j;
}
}
#endif /* FANCY_PRESSURE */
/* Now convert the brush */
source = mask_buf_data (subsample_mask);
dest = mask_buf_data (core->pressure_brush);
i = subsample_mask->width * subsample_mask->height;
while (i--)
*dest++ = mapi[(*source++)];
return core->pressure_brush;
}
static MaskBuf *
gimp_brush_core_solidify_mask (GimpBrushCore *core,
MaskBuf *brush_mask,
gdouble x,
gdouble y)
{
MaskBuf *dest;
guchar *m;
guchar *d;
gint dest_offset_x = 0;
gint dest_offset_y = 0;
gint i, j;
if ((brush_mask->width % 2) == 0)
{
while (x < 0)
x += brush_mask->width;
if ((x - floor (x)) >= 0.5)
dest_offset_x++;
}
if ((brush_mask->height % 2) == 0)
{
while (y < 0)
y += brush_mask->height;
if ((y - floor (y)) >= 0.5)
dest_offset_y++;
}
if (! core->solid_cache_invalid &&
brush_mask == core->last_solid_brush)
{
if (core->solid_brushes[dest_offset_y][dest_offset_x])
return core->solid_brushes[dest_offset_y][dest_offset_x];
}
else
{
for (i = 0; i < BRUSH_CORE_SOLID_SUBSAMPLE; i++)
for (j = 0; j < BRUSH_CORE_SOLID_SUBSAMPLE; j++)
if (core->solid_brushes[i][j])
{
mask_buf_free (core->solid_brushes[i][j]);
core->solid_brushes[i][j] = NULL;
}
core->last_solid_brush = brush_mask;
core->solid_cache_invalid = FALSE;
}
dest = mask_buf_new (brush_mask->width + 2,
brush_mask->height + 2);
core->solid_brushes[dest_offset_y][dest_offset_x] = dest;
m = mask_buf_data (brush_mask);
d = (mask_buf_data (dest) +
(dest_offset_y + 1) * dest->width +
(dest_offset_x + 1));
for (i = 0; i < brush_mask->height; i++)
{
for (j = 0; j < brush_mask->width; j++)
*d++ = (*m++) ? OPAQUE_OPACITY : TRANSPARENT_OPACITY;
d += 2;
}
return dest;
}
static MaskBuf *
gimp_brush_core_scale_mask (GimpBrushCore *core,
MaskBuf *brush_mask,
gdouble scale)
{
gint dest_width;
gint dest_height;
scale = CLAMP (scale, 0.0, 1.0);
if (scale == 0.0)
return NULL;
if (scale == 1.0)
return brush_mask;
gimp_brush_core_calc_brush_size (core, brush_mask, scale,
&dest_width, &dest_height);
if (! core->cache_invalid &&
brush_mask == core->last_scale_brush &&
core->scale_brush &&
dest_width == core->last_scale_width &&
dest_height == core->last_scale_height)
{
return core->scale_brush;
}
core->last_scale_brush = brush_mask;
core->last_scale_width = dest_width;
core->last_scale_height = dest_height;
if (core->scale_brush)
mask_buf_free (core->scale_brush);
core->scale_brush = brush_scale_mask (brush_mask,
dest_width, dest_height);
core->cache_invalid = TRUE;
core->solid_cache_invalid = TRUE;
return core->scale_brush;
}
static MaskBuf *
gimp_brush_core_scale_pixmap (GimpBrushCore *core,
MaskBuf *brush_mask,
gdouble scale)
{
gint dest_width;
gint dest_height;
scale = CLAMP (scale, 0.0, 1.0);
if (scale == 0.0)
return NULL;
if (scale == 1.0)
return brush_mask;
gimp_brush_core_calc_brush_size (core, brush_mask, scale,
&dest_width, &dest_height);
if (! core->cache_invalid &&
brush_mask == core->last_scale_pixmap &&
core->scale_pixmap &&
dest_width == core->last_scale_pixmap_width &&
dest_height == core->last_scale_pixmap_height)
{
return core->scale_pixmap;
}
core->last_scale_pixmap = brush_mask;
core->last_scale_pixmap_width = dest_width;
core->last_scale_pixmap_height = dest_height;
if (core->scale_pixmap)
mask_buf_free (core->scale_pixmap);
core->scale_pixmap = brush_scale_pixmap (brush_mask,
dest_width, dest_height);
core->cache_invalid = TRUE;
return core->scale_pixmap;
}
static MaskBuf *
gimp_brush_core_get_brush_mask (GimpBrushCore *core,
GimpBrushApplicationMode brush_hardness,
gdouble scale)
{
GimpPaintCore *paint_core = GIMP_PAINT_CORE (core);
MaskBuf *mask;
if (paint_core->use_pressure)
mask = gimp_brush_core_scale_mask (core, core->brush->mask, scale);
else
mask = core->brush->mask;
if (! mask)
return NULL;
switch (brush_hardness)
{
case GIMP_BRUSH_SOFT:
mask = gimp_brush_core_subsample_mask (core, mask,
paint_core->cur_coords.x,
paint_core->cur_coords.y);
break;
case GIMP_BRUSH_HARD:
mask = gimp_brush_core_solidify_mask (core, mask,
paint_core->cur_coords.x,
paint_core->cur_coords.y);
break;
case GIMP_BRUSH_PRESSURE:
if (paint_core->use_pressure)
mask = gimp_brush_core_pressurize_mask (core, mask,
paint_core->cur_coords.x,
paint_core->cur_coords.y,
paint_core->cur_coords.pressure);
else
mask = gimp_brush_core_subsample_mask (core, mask,
paint_core->cur_coords.x,
paint_core->cur_coords.y);
break;
default:
break;
}
return mask;
}
/**************************************************/
/* Brush pipe utility functions */
/**************************************************/
void
gimp_brush_core_color_area_with_pixmap (GimpBrushCore *core,
GimpImage *dest,
GimpDrawable *drawable,
TempBuf *area,
gdouble scale,
GimpBrushApplicationMode mode)
{
GimpPaintCore *paint_core = GIMP_PAINT_CORE (core);
PixelRegion destPR;
void *pr;
guchar *d;
gint ulx;
gint uly;
gint offsetx;
gint offsety;
gint y;
TempBuf *pixmap_mask;
TempBuf *brush_mask;
g_return_if_fail (GIMP_IS_BRUSH (core->brush));
g_return_if_fail (core->brush->pixmap != NULL);
/* scale the brushes */
pixmap_mask = gimp_brush_core_scale_pixmap (core,
core->brush->pixmap,
scale);
if (! pixmap_mask)
return;
if (mode != GIMP_BRUSH_HARD)
brush_mask = gimp_brush_core_scale_mask (core,
core->brush->mask,
scale);
else
brush_mask = NULL;
pixel_region_init_temp_buf (&destPR, area,
0, 0, area->width, area->height);
pr = pixel_regions_register (1, &destPR);
/* Calculate upper left corner of brush as in
* gimp_paint_core_get_paint_area. Ugly to have to do this here, too.
*/
ulx = (gint) floor (paint_core->cur_coords.x) - (pixmap_mask->width >> 1);
uly = (gint) floor (paint_core->cur_coords.y) - (pixmap_mask->height >> 1);
offsetx = area->x - ulx;
offsety = area->y - uly;
for (; pr != NULL; pr = pixel_regions_process (pr))
{
d = destPR.data;
for (y = 0; y < destPR.h; y++)
{
paint_line_pixmap_mask (dest, drawable, pixmap_mask, brush_mask,
d, offsetx, y + offsety,
destPR.bytes, destPR.w, mode);
d += destPR.rowstride;
}
}
}
static void
paint_line_pixmap_mask (GimpImage *dest,
GimpDrawable *drawable,
TempBuf *pixmap_mask,
TempBuf *brush_mask,
guchar *d,
gint x,
gint y,
gint bytes,
gint width,
GimpBrushApplicationMode mode)
{
guchar *b;
guchar *p;
guchar *mask;
gdouble alpha;
gdouble factor = 0.00392156986; /* 1.0 / 255.0 */
gint x_index;
gint i,byte_loop;
/* Make sure x, y are positive */
while (x < 0)
x += pixmap_mask->width;
while (y < 0)
y += pixmap_mask->height;
/* Point to the approriate scanline */
b = (temp_buf_data (pixmap_mask) +
(y % pixmap_mask->height) * pixmap_mask->width * pixmap_mask->bytes);
if (mode == GIMP_BRUSH_SOFT && brush_mask)
{
/* ditto, except for the brush mask, so we can pre-multiply the
* alpha value
*/
mask = (temp_buf_data (brush_mask) +
(y % brush_mask->height) * brush_mask->width);
for (i = 0; i < width; i++)
{
/* attempt to avoid doing this calc twice in the loop */
x_index = ((i + x) % pixmap_mask->width);
p = b + x_index * pixmap_mask->bytes;
d[bytes - 1] = mask[x_index];
/* multiply alpha into the pixmap data
* maybe we could do this at tool creation or brush switch time?
* and compute it for the whole brush at once and cache it?
*/
alpha = d[bytes - 1] * factor;
if (alpha)
for (byte_loop = 0; byte_loop < bytes - 1; byte_loop++)
d[byte_loop] *= alpha;
gimp_image_transform_color (dest, drawable, d, GIMP_RGB, p);
d += bytes;
}
}
else
{
for (i = 0; i < width; i++)
{
/* attempt to avoid doing this calc twice in the loop */
x_index = ((i + x) % pixmap_mask->width);
p = b + x_index * pixmap_mask->bytes;
d[bytes - 1] = 255;
/* multiply alpha into the pixmap data
* maybe we could do this at tool creation or brush switch time?
* and compute it for the whole brush at once and cache it?
*/
gimp_image_transform_color (dest, drawable, d, GIMP_RGB, p);
d += bytes;
}
}
}
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