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gimp/app/paint/gimppaintcore.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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib-object.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "paint-types.h"
#include "base/brush-scale.h"
#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "base/tile-manager.h"
#include "base/tile.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimp.h"
#include "core/gimpbrush.h"
#include "core/gimpcontainer.h"
#include "core/gimpdrawable.h"
#include "core/gimpgradient.h"
#include "core/gimpimage.h"
#include "core/gimpimage-undo.h"
#include "core/gimpmarshal.h"
#include "core/gimppaintinfo.h"
#include "gimppaintcore.h"
#include "gimppaintcore-kernels.h"
#include "gimppaintcore-undo.h"
#include "gimppaintoptions.h"
#include "gimp-intl.h"
#define EPSILON 0.00001
/* local function prototypes */
static void gimp_paint_core_class_init (GimpPaintCoreClass *klass);
static void gimp_paint_core_init (GimpPaintCore *core);
static void gimp_paint_core_finalize (GObject *object);
static void gimp_paint_core_calc_brush_size (GimpPaintCore *core,
MaskBuf *mask,
gdouble scale,
gint *width,
gint *height);
static inline void rotate_pointers (gulong **p,
guint32 n);
static MaskBuf * gimp_paint_core_subsample_mask (GimpPaintCore *core,
MaskBuf *mask,
gdouble x,
gdouble y);
static MaskBuf * gimp_paint_core_pressurize_mask (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble x,
gdouble y,
gdouble pressure);
static MaskBuf * gimp_paint_core_solidify_mask (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble x,
gdouble y);
static MaskBuf * gimp_paint_core_scale_mask (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble scale);
static MaskBuf * gimp_paint_core_scale_pixmap (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble scale);
static MaskBuf * gimp_paint_core_get_brush_mask (GimpPaintCore *core,
GimpBrushApplicationMode brush_hardness,
gdouble scale);
static void gimp_paint_core_paste (GimpPaintCore *core,
MaskBuf *brush_mask,
GimpDrawable *drawable,
gdouble brush_opacity,
gdouble image_opacity,
GimpLayerModeEffects paint_mode,
GimpPaintApplicationMode mode);
static void gimp_paint_core_replace (GimpPaintCore *core,
MaskBuf *brush_mask,
GimpDrawable *drawable,
gdouble brush_opacity,
gdouble image_opacity,
GimpPaintApplicationMode mode);
static void brush_to_canvas_tiles (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble brush_opacity);
static void brush_to_canvas_buf (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble brush_opacity);
static void canvas_tiles_to_canvas_buf (GimpPaintCore *core);
static void set_undo_tiles (GimpPaintCore *core,
GimpDrawable *drawable,
gint x,
gint y,
gint w,
gint h);
static void set_canvas_tiles (GimpPaintCore *core,
gint x,
gint y,
gint w,
gint h);
static void gimp_paint_core_invalidate_cache (GimpBrush *brush,
GimpPaintCore *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);
static GimpObjectClass *parent_class = NULL;
static gint global_core_ID = 1;
GType
gimp_paint_core_get_type (void)
{
static GType core_type = 0;
if (! core_type)
{
static const GTypeInfo core_info =
{
sizeof (GimpPaintCoreClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_paint_core_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPaintCore),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_paint_core_init,
};
core_type = g_type_register_static (GIMP_TYPE_OBJECT,
"GimpPaintCore",
&core_info, 0);
}
return core_type;
}
static void
gimp_paint_core_class_init (GimpPaintCoreClass *klass)
{
GObjectClass *object_class;
object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_paint_core_finalize;
klass->paint = NULL;
}
static void
gimp_paint_core_init (GimpPaintCore *core)
{
gint i, j;
core->ID = global_core_ID++;
core->distance = 0.0;
core->spacing = 0.0;
core->x1 = 0;
core->y1 = 0;
core->x2 = 0;
core->y2 = 0;
core->brush = NULL;
core->flags = 0;
core->use_pressure = FALSE;
core->undo_tiles = NULL;
core->canvas_tiles = NULL;
core->orig_buf = NULL;
core->canvas_buf = NULL;
core->pressure_brush = NULL;
for (i = 0; i < PAINT_CORE_SOLID_SUBSAMPLE; i++)
for (j = 0; j < PAINT_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 (PAINT_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->grr_brush = NULL;
core->brush_bound_segs = NULL;
core->n_brush_bound_segs = 0;
}
static void
gimp_paint_core_finalize (GObject *object)
{
GimpPaintCore *core;
gint i, j;
core = GIMP_PAINT_CORE (object);
gimp_paint_core_cleanup (core);
if (core->pressure_brush)
{
temp_buf_free (core->pressure_brush);
core->pressure_brush = NULL;
}
for (i = 0; i < PAINT_CORE_SOLID_SUBSAMPLE; i++)
for (j = 0; j < PAINT_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->grr_brush)
{
g_signal_handlers_disconnect_by_func (core->grr_brush,
gimp_paint_core_invalidate_cache,
core);
g_object_unref (core->grr_brush);
core->grr_brush = NULL;
}
if (core->brush_bound_segs)
{
g_free (core->brush_bound_segs);
core->brush_bound_segs = NULL;
core->n_brush_bound_segs = 0;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
void
gimp_paint_core_paint (GimpPaintCore *core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintCoreState paint_state)
{
g_return_if_fail (GIMP_IS_PAINT_CORE (core));
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options));
if (paint_state == MOTION_PAINT)
{
/* 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 (core->last_coords.x == core->cur_coords.x &&
core->last_coords.y == core->cur_coords.y &&
! gimp_brush_want_null_motion (core->brush,
&core->last_coords,
&core->cur_coords))
{
return;
}
if (core->flags & CORE_HANDLES_CHANGING_BRUSH)
{
core->brush = gimp_brush_select_brush (core->brush,
&core->last_coords,
&core->cur_coords);
}
/* Save coordinates for gimp_paint_core_interpolate() */
core->last_paint.x = core->cur_coords.x;
core->last_paint.y = core->cur_coords.y;
}
GIMP_PAINT_CORE_GET_CLASS (core)->paint (core,
drawable,
paint_options,
paint_state);
}
gboolean
gimp_paint_core_start (GimpPaintCore *core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpCoords *coords)
{
GimpItem *item;
GimpImage *gimage;
g_return_val_if_fail (GIMP_IS_PAINT_CORE (core), FALSE);
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
g_return_val_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options), FALSE);
g_return_val_if_fail (coords != NULL, FALSE);
item = GIMP_ITEM (drawable);
gimage = gimp_item_get_image (item);
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
core->cur_coords = *coords;
/* Each buffer is the same size as
* the maximum bounds of the active brush...
*/
if (core->grr_brush != gimp_context_get_brush (GIMP_CONTEXT (paint_options)))
{
if (core->grr_brush)
{
g_signal_handlers_disconnect_by_func (core->grr_brush,
gimp_paint_core_invalidate_cache,
core);
g_object_unref (core->grr_brush);
core->grr_brush = NULL;
}
if (core->brush_bound_segs)
{
g_free (core->brush_bound_segs);
core->brush_bound_segs = NULL;
core->n_brush_bound_segs = 0;
}
}
if (! core->grr_brush)
{
core->grr_brush = gimp_context_get_brush (GIMP_CONTEXT (paint_options));
if (! core->grr_brush)
{
g_message (_("No brushes available for use with this tool."));
return FALSE;
}
g_object_ref (core->grr_brush);
g_signal_connect (core->grr_brush, "invalidate_preview",
G_CALLBACK (gimp_paint_core_invalidate_cache),
core);
}
core->spacing = (gdouble) gimp_brush_get_spacing (core->grr_brush) / 100.0;
core->brush = core->grr_brush;
/* Allocate the undo structure */
if (core->undo_tiles)
tile_manager_unref (core->undo_tiles);
core->undo_tiles = tile_manager_new (gimp_item_width (item),
gimp_item_height (item),
gimp_drawable_bytes (drawable));
/* Allocate the canvas blocks structure */
if (core->canvas_tiles)
tile_manager_unref (core->canvas_tiles);
core->canvas_tiles = tile_manager_new (gimp_item_width (item),
gimp_item_height (item),
1);
/* Get the initial undo extents */
core->x1 = core->x2 = core->cur_coords.x;
core->y1 = core->y2 = core->cur_coords.y;
core->last_paint.x = -1e6;
core->last_paint.y = -1e6;
return TRUE;
}
void
gimp_paint_core_finish (GimpPaintCore *core,
GimpDrawable *drawable)
{
GimpPaintInfo *paint_info;
GimpImage *gimage;
g_return_if_fail (GIMP_IS_PAINT_CORE (core));
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
g_return_if_fail (GIMP_IS_IMAGE (gimage));
/* Determine if any part of the image has been altered--
* if nothing has, then just return...
*/
if ((core->x2 == core->x1) || (core->y2 == core->y1))
return;
paint_info = (GimpPaintInfo *)
gimp_container_get_child_by_name (gimage->gimp->paint_info_list,
g_type_name (G_TYPE_FROM_INSTANCE (core)));
gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_PAINT,
paint_info ? paint_info->blurb : _("Paint"));
gimp_paint_core_push_undo (gimage, NULL, core);
gimp_drawable_push_undo (drawable, NULL,
core->x1, core->y1,
core->x2, core->y2,
core->undo_tiles,
TRUE);
tile_manager_unref (core->undo_tiles);
core->undo_tiles = NULL;
gimp_image_undo_group_end (gimage);
/* invalidate the previews -- have to do it here, because
* it is not done during the actual painting.
*/
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (drawable));
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (gimage));
}
static void
gimp_paint_core_copy_valid_tiles (TileManager *src_tiles,
TileManager *dest_tiles,
gint x,
gint y,
gint w,
gint h)
{
Tile *src_tile;
gint i, j;
for (i = y; i < (y + h); i += (TILE_HEIGHT - (i % TILE_HEIGHT)))
{
for (j = x; j < (x + w); j += (TILE_WIDTH - (j % TILE_WIDTH)))
{
src_tile = tile_manager_get_tile (src_tiles,
j, i, FALSE, FALSE);
if (tile_is_valid (src_tile) == TRUE)
{
src_tile = tile_manager_get_tile (src_tiles,
j, i, TRUE, FALSE);
tile_manager_map_tile (dest_tiles, j, i, src_tile);
tile_release (src_tile, FALSE);
}
}
}
}
void
gimp_paint_core_cancel (GimpPaintCore *core,
GimpDrawable *drawable)
{
GimpImage *gimage;
g_return_if_fail (GIMP_IS_PAINT_CORE (core));
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
g_return_if_fail (GIMP_IS_IMAGE (gimage));
/* Determine if any part of the image has been altered--
* if nothing has, then just return...
*/
if ((core->x2 == core->x1) || (core->y2 == core->y1))
return;
gimp_paint_core_copy_valid_tiles (core->undo_tiles,
gimp_drawable_data (drawable),
core->x1, core->y1,
core->x2 - core->x1,
core->y2 - core->y1);
tile_manager_unref (core->undo_tiles);
core->undo_tiles = NULL;
gimp_drawable_update (drawable,
core->x1, core->y1,
core->x2 - core->x1, core->y2 - core->y1);
}
void
gimp_paint_core_cleanup (GimpPaintCore *core)
{
g_return_if_fail (GIMP_IS_PAINT_CORE (core));
if (core->undo_tiles)
{
tile_manager_unref (core->undo_tiles);
core->undo_tiles = NULL;
}
if (core->canvas_tiles)
{
tile_manager_unref (core->canvas_tiles);
core->canvas_tiles = NULL;
}
if (core->orig_buf)
{
temp_buf_free (core->orig_buf);
core->orig_buf = NULL;
}
if (core->canvas_buf)
{
temp_buf_free (core->canvas_buf);
core->canvas_buf = NULL;
}
}
/**
* gimp_paint_core_constrain_helper:
* @dx: the (fixed) delta-x
* @dy: a suggested delta-y
*
* Returns an adjusted dy' near dy such that the slope (dx,dy') is a
* multiple of 15 degrees.
**/
static gdouble
gimp_paint_core_constrain_helper (gdouble dx,
gdouble dy)
{
static gdouble slope[4] = { 0, 0.26795, 0.57735, 1 };
static gdouble divider[3] = { 0.13165, 0.41421, 0.76732 };
gint i;
if (dy < 0)
return - gimp_paint_core_constrain_helper (dx,-dy);
dx = fabs (dx);
for (i = 0; i < 3; i ++)
if (dy < dx * divider[i])
break;
dy = dx * slope[i];
return dy;
}
/**
* gimp_paint_core_constrain:
* @core: the #GimpPaintCore.
*
* Restricts the (core->last_coords, core->cur_coords) vector to 15
* degree steps, possibly changing core->cur_coords.
**/
void
gimp_paint_core_constrain (GimpPaintCore *core)
{
gdouble dx, dy;
g_return_if_fail (GIMP_IS_PAINT_CORE (core));
dx = core->cur_coords.x - core->last_coords.x;
dy = core->cur_coords.y - core->last_coords.y;
/* This algorithm changes only one of dx and dy, and does not try
* to constrain the resulting dx and dy to integers. This gives
* at least two benefits:
* 1. gimp_paint_core_constrain is idempotent, even if followed by
* a rounding operation.
* 2. For any two lines with the same starting-point and ideal
* 15-degree direction, the points plotted by
* gimp_paint_core_interpolate for the shorter line will always
* be a superset of those plotted for the longer line.
*/
if (fabs(dx) > fabs(dy))
core->cur_coords.y = core->last_coords.y +
gimp_paint_core_constrain_helper (dx,dy);
else
core->cur_coords.x = core->last_coords.x +
gimp_paint_core_constrain_helper (dy,dx);
}
/**
* 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);
}
void
gimp_paint_core_interpolate (GimpPaintCore *core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
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;
g_return_if_fail (GIMP_IS_PAINT_CORE (core));
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options));
gimp_avoid_exact_integer (&core->last_coords.x);
gimp_avoid_exact_integer (&core->last_coords.y);
gimp_avoid_exact_integer (&core->cur_coords.x);
gimp_avoid_exact_integer (&core->cur_coords.y);
delta_vec.x = core->cur_coords.x - core->last_coords.x;
delta_vec.y = core->cur_coords.y - core->last_coords.y;
delta_pressure = core->cur_coords.pressure - core->last_coords.pressure;
delta_xtilt = core->cur_coords.xtilt - core->last_coords.xtilt;
delta_ytilt = core->cur_coords.ytilt - core->last_coords.ytilt;
delta_wheel = core->cur_coords.wheel - 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 + core->distance;
initial = core->distance;
pixel_dist = gimp_vector2_length (&delta_vec);
pixel_initial = 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 = core->last_coords.x - 0.5;
}
else
{
st_factor = delta_vec.y;
st_offset = 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.
*/
core->cur_coords.x = core->last_coords.x;
core->cur_coords.y = 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 (core->last_coords.x + t0 * delta_vec.x);
y = (gint) floor (core->last_coords.y + t0 * delta_vec.y);
if (t0 < 0.0 && !( x == (gint) floor (core->last_coords.x) &&
y == (gint) floor (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 (core->last_paint.x) &&
y == (gint) floor (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 (core->last_coords.x + tn * delta_vec.x);
y = (gint) floor (core->last_coords.y + tn * delta_vec.y);
if (tn > 1.0 && !( x == (gint) floor( core->cur_coords.x ) &&
y == (gint) floor( 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++)
{
GimpBrush *current_brush;
gdouble t = t0 + n*dt;
core->cur_coords.x = core->last_coords.x + t * delta_vec.x;
core->cur_coords.y = core->last_coords.y + t * delta_vec.y;
core->cur_coords.pressure = core->last_coords.pressure + t * delta_pressure;
core->cur_coords.xtilt = core->last_coords.xtilt + t * delta_xtilt;
core->cur_coords.ytilt = core->last_coords.ytilt + t * delta_ytilt;
core->cur_coords.wheel = core->last_coords.wheel + t * delta_wheel;
core->distance = initial + t * dist;
core->pixel_dist = pixel_initial + t * pixel_dist;
/* save the current brush */
current_brush = core->brush;
gimp_paint_core_paint (core, drawable, paint_options, MOTION_PAINT);
/* restore the current brush pointer */
core->brush = current_brush;
}
core->cur_coords.x = core->last_coords.x + delta_vec.x;
core->cur_coords.y = core->last_coords.y + delta_vec.y;
core->cur_coords.pressure = core->last_coords.pressure + delta_pressure;
core->cur_coords.xtilt = core->last_coords.xtilt + delta_xtilt;
core->cur_coords.ytilt = core->last_coords.ytilt + delta_ytilt;
core->cur_coords.wheel = core->last_coords.wheel + delta_wheel;
core->distance = total;
core->pixel_dist = pixel_initial + pixel_dist;
core->last_coords = core->cur_coords;
}
/* protected functions */
TempBuf *
gimp_paint_core_get_paint_area (GimpPaintCore *core,
GimpDrawable *drawable,
gdouble scale)
{
gint x, y;
gint x1, y1, x2, y2;
gint bytes;
gint dwidth, dheight;
gint bwidth, bheight;
bytes = gimp_drawable_bytes_with_alpha (drawable);
gimp_paint_core_calc_brush_size (core,
core->brush->mask,
scale,
&bwidth, &bheight);
/* adjust the x and y coordinates to the upper left corner of the brush */
x = (gint) floor (core->cur_coords.x) - (bwidth >> 1);
y = (gint) floor (core->cur_coords.y) - (bheight >> 1);
dwidth = gimp_item_width (GIMP_ITEM (drawable));
dheight = gimp_item_height (GIMP_ITEM (drawable));
x1 = CLAMP (x - 1, 0, dwidth);
y1 = CLAMP (y - 1, 0, dheight);
x2 = CLAMP (x + bwidth + 1, 0, dwidth);
y2 = CLAMP (y + bheight + 1, 0, dheight);
/* configure the canvas buffer */
if ((x2 - x1) && (y2 - y1))
core->canvas_buf = temp_buf_resize (core->canvas_buf, bytes,
x1, y1,
(x2 - x1), (y2 - y1));
else
return NULL;
return core->canvas_buf;
}
TempBuf *
gimp_paint_core_get_orig_image (GimpPaintCore *core,
GimpDrawable *drawable,
gint x1,
gint y1,
gint x2,
gint y2)
{
PixelRegion srcPR;
PixelRegion destPR;
Tile *undo_tile;
gint h;
gint refd;
gint pixelwidth;
gint dwidth;
gint dheight;
guchar *s;
guchar *d;
gpointer pr;
core->orig_buf = temp_buf_resize (core->orig_buf,
gimp_drawable_bytes (drawable),
x1, y1,
(x2 - x1), (y2 - y1));
dwidth = gimp_item_width (GIMP_ITEM (drawable));
dheight = gimp_item_height (GIMP_ITEM (drawable));
x1 = CLAMP (x1, 0, dwidth);
y1 = CLAMP (y1, 0, dheight);
x2 = CLAMP (x2, 0, dwidth);
y2 = CLAMP (y2, 0, dheight);
/* configure the pixel regions */
pixel_region_init (&srcPR, gimp_drawable_data (drawable),
x1, y1,
(x2 - x1), (y2 - y1),
FALSE);
destPR.bytes = core->orig_buf->bytes;
destPR.x = 0;
destPR.y = 0;
destPR.w = (x2 - x1);
destPR.h = (y2 - y1);
destPR.rowstride = core->orig_buf->bytes * core->orig_buf->width;
destPR.data = (temp_buf_data (core->orig_buf) +
(y1 - core->orig_buf->y) * destPR.rowstride +
(x1 - core->orig_buf->x) * destPR.bytes);
for (pr = pixel_regions_register (2, &srcPR, &destPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
/* If the undo tile corresponding to this location is valid, use it */
undo_tile = tile_manager_get_tile (core->undo_tiles,
srcPR.x, srcPR.y,
FALSE, FALSE);
if (tile_is_valid (undo_tile) == TRUE)
{
refd = 1;
undo_tile = tile_manager_get_tile (core->undo_tiles,
srcPR.x, srcPR.y,
TRUE, FALSE);
s = (unsigned char*)tile_data_pointer (undo_tile, 0, 0) +
srcPR.rowstride * (srcPR.y % TILE_HEIGHT) +
srcPR.bytes * (srcPR.x % TILE_WIDTH); /* dubious... */
}
else
{
refd = 0;
s = srcPR.data;
}
d = destPR.data;
pixelwidth = srcPR.w * srcPR.bytes;
h = srcPR.h;
while (h --)
{
memcpy (d, s, pixelwidth);
s += srcPR.rowstride;
d += destPR.rowstride;
}
if (refd)
tile_release (undo_tile, FALSE);
}
return core->orig_buf;
}
void
gimp_paint_core_paste_canvas (GimpPaintCore *core,
GimpDrawable *drawable,
gdouble brush_opacity,
gdouble image_opacity,
GimpLayerModeEffects paint_mode,
GimpBrushApplicationMode brush_hardness,
gdouble brush_scale,
GimpPaintApplicationMode mode)
{
MaskBuf *brush_mask = gimp_paint_core_get_brush_mask (core,
brush_hardness,
brush_scale);
if (brush_mask)
gimp_paint_core_paste (core, brush_mask, drawable,
brush_opacity,
image_opacity, paint_mode,
mode);
}
/* Similar to gimp_paint_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_paint_core_replace_canvas (GimpPaintCore *core,
GimpDrawable *drawable,
gdouble brush_opacity,
gdouble image_opacity,
GimpBrushApplicationMode brush_hardness,
gdouble brush_scale,
GimpPaintApplicationMode mode)
{
MaskBuf *brush_mask = gimp_paint_core_get_brush_mask (core,
brush_hardness,
brush_scale);
if (brush_mask)
gimp_paint_core_replace (core, brush_mask, drawable,
brush_opacity,
image_opacity, mode);
}
static void
gimp_paint_core_invalidate_cache (GimpBrush *brush,
GimpPaintCore *core)
{
/* Make sure we don't cache data for a brush that has changed */
core->cache_invalid = TRUE;
core->solid_cache_invalid = TRUE;
if (core->brush_bound_segs)
{
g_free (core->brush_bound_segs);
core->brush_bound_segs = NULL;
core->n_brush_bound_segs = 0;
}
}
/************************************************************
* LOCAL FUNCTION DEFINITIONS *
************************************************************/
static void
gimp_paint_core_calc_brush_size (GimpPaintCore *core,
MaskBuf *mask,
gdouble scale,
gint *width,
gint *height)
{
scale = CLAMP (scale, 0.0, 1.0);
if (! 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_paint_core_subsample_mask (GimpPaintCore *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;
gint kernel_sum;
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);
/* Investigate modifiying kernelgen to make the sum the same
* for all kernels. That way kernal_sum becomes a constant
*/
kernel_sum = 0;
for (i = 0; i < KERNEL_HEIGHT * KERNEL_WIDTH; i++)
{
kernel_sum += kernel[i];
}
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_paint_core_pressurize_mask (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble x,
gdouble y,
gdouble pressure)
{
static guchar mapi[256];
guchar *source;
guchar *dest;
MaskBuf *subsample_mask;
gint i;
#ifdef FANCY_PRESSURE
static gdouble map[256];
gdouble ds, s, c;
#endif
/* Get the raw subsampled mask */
subsample_mask = gimp_paint_core_subsample_mask (core,
brush_mask,
x, y);
/* Special case pressure = 0.5 */
if ((int)(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
| / --
| / /
/ / |
-- / |
*/
ds = (pressure - 0.5)*(20./256.);
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] = (int)(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] = (int)(255*(1-map[i]/map[0]));
}
#else /* ! FANCY_PRESSURE */
for (i = 0; i < 256; i++)
{
gint tmp = (pressure / 0.5) * i;
if (tmp > 255)
mapi[i] = 255;
else
mapi[i] = tmp;
}
#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_paint_core_solidify_mask (GimpPaintCore *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 (brush_mask == core->last_solid_brush && ! core->solid_cache_invalid)
{
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 < PAINT_CORE_SOLID_SUBSAMPLE; i++)
for (j = 0; j < PAINT_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_paint_core_scale_mask (GimpPaintCore *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_paint_core_calc_brush_size (core,
brush_mask,
scale,
&dest_width, &dest_height);
if (brush_mask == core->last_scale_brush &&
core->scale_brush &&
! core->cache_invalid &&
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_paint_core_scale_pixmap (GimpPaintCore *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_paint_core_calc_brush_size (core,
brush_mask,
scale,
&dest_width, &dest_height);
if (brush_mask == core->last_scale_pixmap &&
core->scale_pixmap &&
! core->cache_invalid &&
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_paint_core_get_brush_mask (GimpPaintCore *core,
GimpBrushApplicationMode brush_hardness,
gdouble scale)
{
MaskBuf *mask;
if (core->use_pressure)
mask = gimp_paint_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_paint_core_subsample_mask (core, mask,
core->cur_coords.x,
core->cur_coords.y);
break;
case GIMP_BRUSH_HARD:
mask = gimp_paint_core_solidify_mask (core, mask,
core->cur_coords.x,
core->cur_coords.y);
break;
case GIMP_BRUSH_PRESSURE:
if (core->use_pressure)
mask = gimp_paint_core_pressurize_mask (core, mask,
core->cur_coords.x,
core->cur_coords.y,
core->cur_coords.pressure);
else
mask = gimp_paint_core_subsample_mask (core, mask,
core->cur_coords.x,
core->cur_coords.y);
break;
default:
break;
}
return mask;
}
static void
gimp_paint_core_paste (GimpPaintCore *core,
MaskBuf *brush_mask,
GimpDrawable *drawable,
gdouble brush_opacity,
gdouble image_opacity,
GimpLayerModeEffects paint_mode,
GimpPaintApplicationMode mode)
{
GimpImage *gimage;
PixelRegion srcPR;
TileManager *alt = NULL;
gint offx;
gint offy;
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
/* set undo blocks */
set_undo_tiles (core,
drawable,
core->canvas_buf->x,
core->canvas_buf->y,
core->canvas_buf->width,
core->canvas_buf->height);
/* If the mode is CONSTANT:
* combine the canvas buf, the brush mask to the canvas tiles
*/
if (mode == GIMP_PAINT_CONSTANT)
{
/* initialize any invalid canvas tiles */
set_canvas_tiles (core,
core->canvas_buf->x,
core->canvas_buf->y,
core->canvas_buf->width,
core->canvas_buf->height);
brush_to_canvas_tiles (core, brush_mask, brush_opacity);
canvas_tiles_to_canvas_buf (core);
alt = core->undo_tiles;
}
/* Otherwise:
* combine the canvas buf and the brush mask to the canvas buf
*/
else
{
brush_to_canvas_buf (core, brush_mask, brush_opacity);
}
/* intialize canvas buf source pixel regions */
srcPR.bytes = core->canvas_buf->bytes;
srcPR.x = 0;
srcPR.y = 0;
srcPR.w = core->canvas_buf->width;
srcPR.h = core->canvas_buf->height;
srcPR.rowstride = core->canvas_buf->width * core->canvas_buf->bytes;
srcPR.data = temp_buf_data (core->canvas_buf);
/* apply the paint area to the gimage */
gimp_drawable_apply_region (drawable, &srcPR,
FALSE, NULL,
image_opacity, paint_mode,
alt, /* specify an alternative src1 */
core->canvas_buf->x,
core->canvas_buf->y);
/* Update the undo extents */
core->x1 = MIN (core->x1, core->canvas_buf->x);
core->y1 = MIN (core->y1, core->canvas_buf->y);
core->x2 = MAX (core->x2, core->canvas_buf->x + core->canvas_buf->width);
core->y2 = MAX (core->y2, core->canvas_buf->y + core->canvas_buf->height);
/* Update the gimage -- It is important to call gimp_image_update()
* instead of gimp_drawable_update() because we don't want the
* drawable and image previews to be constantly invalidated
*/
gimp_item_offsets (GIMP_ITEM (drawable), &offx, &offy);
gimp_image_update (gimage,
core->canvas_buf->x + offx,
core->canvas_buf->y + offy,
core->canvas_buf->width,
core->canvas_buf->height);
}
/* This works similarly to gimp_paint_core_paste. However, instead of
* combining the canvas to the paint core drawable using one of the
* combination modes, it uses a "replace" mode (i.e. transparent
* pixels in the canvas erase the paint core drawable).
* When not drawing on alpha-enabled images, it just paints using
* NORMAL mode.
*/
static void
gimp_paint_core_replace (GimpPaintCore *core,
MaskBuf *brush_mask,
GimpDrawable *drawable,
gdouble brush_opacity,
gdouble image_opacity,
GimpPaintApplicationMode mode)
{
GimpImage *gimage;
PixelRegion srcPR;
PixelRegion maskPR;
TileManager *alt = NULL;
gint offx;
gint offy;
if (! gimp_drawable_has_alpha (drawable))
{
gimp_paint_core_paste (core, brush_mask, drawable,
brush_opacity,
image_opacity, GIMP_NORMAL_MODE,
mode);
return;
}
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
/* set undo blocks */
set_undo_tiles (core,
drawable,
core->canvas_buf->x,
core->canvas_buf->y,
core->canvas_buf->width,
core->canvas_buf->height);
if (mode == GIMP_PAINT_CONSTANT)
{
/* initialize any invalid canvas tiles */
set_canvas_tiles (core,
core->canvas_buf->x,
core->canvas_buf->y,
core->canvas_buf->width,
core->canvas_buf->height);
/* combine the brush mask and the canvas tiles */
brush_to_canvas_tiles (core, brush_mask, brush_opacity);
/* set the alt source as the unaltered undo_tiles */
alt = core->undo_tiles;
/* initialize the maskPR from the canvas tiles */
pixel_region_init (&maskPR, core->canvas_tiles,
core->canvas_buf->x,
core->canvas_buf->y,
core->canvas_buf->width,
core->canvas_buf->height,
FALSE);
}
else
{
/* The mask is just the brush mask */
maskPR.bytes = 1;
maskPR.x = 0;
maskPR.y = 0;
maskPR.w = core->canvas_buf->width;
maskPR.h = core->canvas_buf->height;
maskPR.rowstride = maskPR.bytes * brush_mask->width;
maskPR.data = mask_buf_data (brush_mask);
}
/* intialize canvas buf source pixel regions */
srcPR.bytes = core->canvas_buf->bytes;
srcPR.x = 0;
srcPR.y = 0;
srcPR.w = core->canvas_buf->width;
srcPR.h = core->canvas_buf->height;
srcPR.rowstride = core->canvas_buf->width * core->canvas_buf->bytes;
srcPR.data = temp_buf_data (core->canvas_buf);
/* apply the paint area to the gimage */
gimp_drawable_replace_region (drawable, &srcPR,
FALSE, NULL,
image_opacity,
&maskPR,
core->canvas_buf->x,
core->canvas_buf->y);
/* Update the undo extents */
core->x1 = MIN (core->x1, core->canvas_buf->x);
core->y1 = MIN (core->y1, core->canvas_buf->y);
core->x2 = MAX (core->x2, core->canvas_buf->x + core->canvas_buf->width) ;
core->y2 = MAX (core->y2, core->canvas_buf->y + core->canvas_buf->height) ;
/* Update the gimage -- It is important to call gimp_image_update()
* instead of gimp_drawable_update() because we don't want the
* drawable and image previews to be constantly invalidated
*/
gimp_item_offsets (GIMP_ITEM (drawable), &offx, &offy);
gimp_image_update (gimage,
core->canvas_buf->x + offx,
core->canvas_buf->y + offy,
core->canvas_buf->width,
core->canvas_buf->height);
}
static void
canvas_tiles_to_canvas_buf (GimpPaintCore *core)
{
PixelRegion srcPR;
PixelRegion maskPR;
/* combine the canvas tiles and the canvas buf */
srcPR.bytes = core->canvas_buf->bytes;
srcPR.x = 0;
srcPR.y = 0;
srcPR.w = core->canvas_buf->width;
srcPR.h = core->canvas_buf->height;
srcPR.rowstride = core->canvas_buf->width * core->canvas_buf->bytes;
srcPR.data = temp_buf_data (core->canvas_buf);
pixel_region_init (&maskPR, core->canvas_tiles,
core->canvas_buf->x,
core->canvas_buf->y,
core->canvas_buf->width,
core->canvas_buf->height,
FALSE);
/* apply the canvas tiles to the canvas buf */
apply_mask_to_region (&srcPR, &maskPR, OPAQUE_OPACITY);
}
static void
brush_to_canvas_tiles (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble brush_opacity)
{
PixelRegion srcPR;
PixelRegion maskPR;
gint x;
gint y;
gint xoff;
gint yoff;
/* combine the brush mask and the canvas tiles */
pixel_region_init (&srcPR, core->canvas_tiles,
core->canvas_buf->x,
core->canvas_buf->y,
core->canvas_buf->width,
core->canvas_buf->height,
TRUE);
x = (gint) floor (core->cur_coords.x) - (brush_mask->width >> 1);
y = (gint) floor (core->cur_coords.y) - (brush_mask->height >> 1);
xoff = (x < 0) ? -x : 0;
yoff = (y < 0) ? -y : 0;
maskPR.bytes = 1;
maskPR.x = 0;
maskPR.y = 0;
maskPR.w = srcPR.w;
maskPR.h = srcPR.h;
maskPR.rowstride = maskPR.bytes * brush_mask->width;
maskPR.data = mask_buf_data (brush_mask) + (yoff * maskPR.rowstride +
xoff * maskPR.bytes);
/* combine the mask to the canvas tiles */
combine_mask_and_region (&srcPR, &maskPR, brush_opacity * 255.999);
}
static void
brush_to_canvas_buf (GimpPaintCore *core,
MaskBuf *brush_mask,
gdouble brush_opacity)
{
PixelRegion srcPR;
PixelRegion maskPR;
gint x;
gint y;
gint xoff;
gint yoff;
x = (gint) floor (core->cur_coords.x) - (brush_mask->width >> 1);
y = (gint) floor (core->cur_coords.y) - (brush_mask->height >> 1);
xoff = (x < 0) ? -x : 0;
yoff = (y < 0) ? -y : 0;
/* combine the canvas buf and the brush mask to the canvas buf */
srcPR.bytes = core->canvas_buf->bytes;
srcPR.x = 0;
srcPR.y = 0;
srcPR.w = core->canvas_buf->width;
srcPR.h = core->canvas_buf->height;
srcPR.rowstride = core->canvas_buf->width * core->canvas_buf->bytes;
srcPR.data = temp_buf_data (core->canvas_buf);
maskPR.bytes = 1;
maskPR.x = 0;
maskPR.y = 0;
maskPR.w = srcPR.w;
maskPR.h = srcPR.h;
maskPR.rowstride = maskPR.bytes * brush_mask->width;
maskPR.data = mask_buf_data (brush_mask) + yoff * maskPR.rowstride + xoff * maskPR.bytes;
/* apply the mask */
apply_mask_to_region (&srcPR, &maskPR, brush_opacity * 255.999);
}
static void
set_undo_tiles (GimpPaintCore *core,
GimpDrawable *drawable,
gint x,
gint y,
gint w,
gint h)
{
gint i;
gint j;
Tile *src_tile;
Tile *dest_tile;
if (! core->undo_tiles)
{
g_warning ("set_undo_tiles: undo_tiles is null");
return;
}
for (i = y; i < (y + h); i += (TILE_HEIGHT - (i % TILE_HEIGHT)))
{
for (j = x; j < (x + w); j += (TILE_WIDTH - (j % TILE_WIDTH)))
{
dest_tile = tile_manager_get_tile (core->undo_tiles, j, i,
FALSE, FALSE);
if (tile_is_valid (dest_tile) == FALSE)
{
src_tile = tile_manager_get_tile (gimp_drawable_data (drawable),
j, i, TRUE, FALSE);
tile_manager_map_tile (core->undo_tiles, j, i, src_tile);
tile_release (src_tile, FALSE);
}
}
}
}
static void
set_canvas_tiles (GimpPaintCore *core,
gint x,
gint y,
gint w,
gint h)
{
gint i;
gint j;
Tile *tile;
for (i = y; i < (y + h); i += (TILE_HEIGHT - (i % TILE_HEIGHT)))
{
for (j = x; j < (x + w); j += (TILE_WIDTH - (j % TILE_WIDTH)))
{
tile = tile_manager_get_tile (core->canvas_tiles, j, i,
FALSE, FALSE);
if (tile_is_valid (tile) == FALSE)
{
tile = tile_manager_get_tile (core->canvas_tiles, j, i,
TRUE, TRUE);
memset (tile_data_pointer (tile, 0, 0), 0, tile_size (tile));
tile_release (tile, TRUE);
}
}
}
}
/**************************************************/
/* Brush pipe utility functions */
/**************************************************/
void
gimp_paint_core_color_area_with_pixmap (GimpPaintCore *core,
GimpImage *dest,
GimpDrawable *drawable,
TempBuf *area,
gdouble scale,
GimpBrushApplicationMode mode)
{
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_paint_core_scale_pixmap (core,
core->brush->pixmap,
scale);
if (!pixmap_mask)
return;
if (mode != GIMP_BRUSH_HARD)
brush_mask = gimp_paint_core_scale_mask (core,
core->brush->mask,
scale);
else
brush_mask = NULL;
destPR.bytes = area->bytes;
destPR.x = 0;
destPR.y = 0;
destPR.w = area->width;
destPR.h = area->height;
destPR.rowstride = destPR.bytes * area->width;
destPR.data = temp_buf_data (area);
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 (core->cur_coords.x) - (pixmap_mask->width >> 1);
uly = (gint) floor (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;
/* printf("i: %i d->r: %i d->g: %i d->b: %i d->a: %i\n",i,(int)d[0], (int)d[1], (int)d[2], (int)d[3]); */
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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