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gimp/app/paint/gimpink.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/pixel-region.h"
#include "base/temp-buf.h"
#include "base/tile.h"
#include "base/tile-manager.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "gimpinkoptions.h"
#include "gimpink.h"
#include "gimpink-blob.h"
#include "gimpink-undo.h"
#include "gimp-intl.h"
#define SUBSAMPLE 8
/* local function prototypes */
static void gimp_ink_finalize (GObject *object);
static void gimp_ink_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintState paint_state,
guint32 time);
static TempBuf * gimp_ink_get_paint_area (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options);
static void gimp_ink_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
guint32 time);
static Blob * ink_pen_ellipse (GimpInkOptions *options,
gdouble x_center,
gdouble y_center,
gdouble pressure,
gdouble xtilt,
gdouble ytilt,
gdouble velocity);
static void time_smoother_add (GimpInk *ink,
guint32 value);
static guint32 time_smoother_result (GimpInk *ink);
static void time_smoother_init (GimpInk *ink,
guint32 initval);
static void dist_smoother_add (GimpInk *ink,
gdouble value);
static gdouble dist_smoother_result (GimpInk *ink);
static void dist_smoother_init (GimpInk *ink,
gdouble initval);
static void render_blob (Blob *blob,
PixelRegion *dest);
G_DEFINE_TYPE (GimpInk, gimp_ink, GIMP_TYPE_PAINT_CORE)
#define parent_class gimp_ink_parent_class
void
gimp_ink_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp,
GIMP_TYPE_INK,
GIMP_TYPE_INK_OPTIONS,
"gimp-ink",
_("Ink"),
"gimp-tool-ink");
}
static void
gimp_ink_class_init (GimpInkClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpPaintCoreClass *paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
object_class->finalize = gimp_ink_finalize;
paint_core_class->paint = gimp_ink_paint;
paint_core_class->get_paint_area = gimp_ink_get_paint_area;
paint_core_class->push_undo = gimp_ink_push_undo;
}
static void
gimp_ink_init (GimpInk *ink)
{
}
static void
gimp_ink_finalize (GObject *object)
{
GimpInk *ink = GIMP_INK (object);
if (ink->start_blob)
{
g_free (ink->start_blob);
ink->start_blob = NULL;
}
if (ink->last_blob)
{
g_free (ink->last_blob);
ink->last_blob = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_ink_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintState paint_state,
guint32 time)
{
GimpInk *ink = GIMP_INK (paint_core);
switch (paint_state)
{
case GIMP_PAINT_STATE_INIT:
if (paint_core->cur_coords.x == paint_core->last_coords.x &&
paint_core->cur_coords.y == paint_core->last_coords.y)
{
/* start with new blobs if we're not interpolating */
if (ink->start_blob)
{
g_free (ink->start_blob);
ink->start_blob = NULL;
}
if (ink->last_blob)
{
g_free (ink->last_blob);
ink->last_blob = NULL;
}
}
else if (ink->last_blob)
{
/* save the start blob of the line for undo otherwise */
if (ink->start_blob)
g_free (ink->start_blob);
ink->start_blob = blob_duplicate (ink->last_blob);
}
break;
case GIMP_PAINT_STATE_MOTION:
gimp_ink_motion (paint_core, drawable, paint_options, time);
break;
case GIMP_PAINT_STATE_FINISH:
break;
}
}
static TempBuf *
gimp_ink_get_paint_area (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
GimpInk *ink = GIMP_INK (paint_core);
gint x, y;
gint width, height;
gint dwidth, dheight;
gint x1, y1, x2, y2;
gint bytes;
bytes = gimp_drawable_bytes_with_alpha (drawable);
blob_bounds (ink->cur_blob, &x, &y, &width, &height);
dwidth = gimp_item_width (GIMP_ITEM (drawable));
dheight = gimp_item_height (GIMP_ITEM (drawable));
x1 = CLAMP (x / SUBSAMPLE - 1, 0, dwidth);
y1 = CLAMP (y / SUBSAMPLE - 1, 0, dheight);
x2 = CLAMP ((x + width) / SUBSAMPLE + 2, 0, dwidth);
y2 = CLAMP ((y + height) / SUBSAMPLE + 2, 0, dheight);
/* 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_ink_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
guint32 time)
{
GimpInk *ink = GIMP_INK (paint_core);
GimpInkOptions *options = GIMP_INK_OPTIONS (paint_options);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpImage *image;
Blob *blob_union = NULL;
Blob *blob_to_render;
TempBuf *area;
guchar col[MAX_CHANNELS];
PixelRegion blob_maskPR;
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (! ink->last_blob)
{
ink->last_blob = ink_pen_ellipse (options,
paint_core->cur_coords.x,
paint_core->cur_coords.y,
paint_core->cur_coords.pressure,
paint_core->cur_coords.xtilt,
paint_core->cur_coords.ytilt,
10.0);
if (ink->start_blob)
g_free (ink->start_blob);
ink->start_blob = blob_duplicate (ink->last_blob);
time_smoother_init (ink, time);
ink->last_time = time;
dist_smoother_init (ink, 0.0);
ink->init_velocity = TRUE;
blob_to_render = ink->last_blob;
}
else
{
Blob *blob;
gdouble dist;
gdouble velocity;
guint32 lasttime = ink->last_time;
guint32 thistime;
time_smoother_add (ink, time);
thistime = ink->last_time = time_smoother_result (ink);
/* The time resolution on X-based GDK motion events is bloody
* awful, hence the use of the smoothing function. Sadly this
* also means that there is always the chance of having an
* indeterminite velocity since this event and the previous
* several may still appear to issue at the same
* instant. -ADM
*/
if (thistime == lasttime)
thistime = lasttime + 1;
dist = sqrt ((paint_core->last_coords.x - paint_core->cur_coords.x) *
(paint_core->last_coords.x - paint_core->cur_coords.x) +
(paint_core->last_coords.y - paint_core->cur_coords.y) *
(paint_core->last_coords.y - paint_core->cur_coords.y));
if (ink->init_velocity)
{
dist_smoother_init (ink, dist);
ink->init_velocity = FALSE;
}
else
{
dist_smoother_add (ink, dist);
dist = dist_smoother_result (ink);
}
velocity = 10.0 * sqrt ((dist) / (gdouble) (thistime - lasttime));
blob = ink_pen_ellipse (options,
paint_core->cur_coords.x,
paint_core->cur_coords.y,
paint_core->cur_coords.pressure,
paint_core->cur_coords.xtilt,
paint_core->cur_coords.ytilt,
velocity);
blob_union = blob_convex_union (ink->last_blob, blob);
g_free (ink->last_blob);
ink->last_blob = blob;
blob_to_render = blob_union;
}
/* Get the buffer */
ink->cur_blob = blob_to_render;
area = gimp_paint_core_get_paint_area (paint_core, drawable, paint_options);
ink->cur_blob = NULL;
if (! area)
return;
gimp_image_get_foreground (image, drawable, context, col);
/* set the alpha channel */
col[paint_core->canvas_buf->bytes - 1] = OPAQUE_OPACITY;
/* color the pixels */
color_pixels (temp_buf_data (paint_core->canvas_buf), col,
area->width * area->height, area->bytes);
gimp_paint_core_validate_canvas_tiles (paint_core,
paint_core->canvas_buf->x,
paint_core->canvas_buf->y,
paint_core->canvas_buf->width,
paint_core->canvas_buf->height);
/* draw the blob directly to the canvas_tiles */
pixel_region_init (&blob_maskPR, paint_core->canvas_tiles,
paint_core->canvas_buf->x,
paint_core->canvas_buf->y,
paint_core->canvas_buf->width,
paint_core->canvas_buf->height,
TRUE);
render_blob (blob_to_render, &blob_maskPR);
/* draw the canvas_buf using the just rendered canvas_tiles as mask */
pixel_region_init (&blob_maskPR, paint_core->canvas_tiles,
paint_core->canvas_buf->x,
paint_core->canvas_buf->y,
paint_core->canvas_buf->width,
paint_core->canvas_buf->height,
FALSE);
gimp_paint_core_paste (paint_core, &blob_maskPR, drawable,
GIMP_OPACITY_OPAQUE,
gimp_context_get_opacity (context),
gimp_context_get_paint_mode (context),
GIMP_PAINT_CONSTANT);
if (blob_union)
g_free (blob_union);
}
static Blob *
ink_pen_ellipse (GimpInkOptions *options,
gdouble x_center,
gdouble y_center,
gdouble pressure,
gdouble xtilt,
gdouble ytilt,
gdouble velocity)
{
BlobFunc blob_function;
gdouble size;
gdouble tsin, tcos;
gdouble aspect, radmin;
gdouble x,y;
gdouble tscale;
gdouble tscale_c;
gdouble tscale_s;
/* Adjust the size depending on pressure. */
size = options->size * (1.0 + options->size_sensitivity *
(2.0 * pressure - 1.0));
/* Adjust the size further depending on pointer velocity and
* velocity-sensitivity. These 'magic constants' are 'feels
* natural' tigert-approved. --ADM
*/
if (velocity < 3.0)
velocity = 3.0;
#ifdef VERBOSE
g_printerr ("%g (%g) -> ", size, velocity);
#endif
size = (options->vel_sensitivity *
((4.5 * size) / (1.0 + options->vel_sensitivity * (2.0 * velocity)))
+ (1.0 - options->vel_sensitivity) * size);
#ifdef VERBOSE
g_printerr ("%g\n", (gfloat) size);
#endif
/* Clamp resulting size to sane limits */
if (size > options->size * (1.0 + options->size_sensitivity))
size = options->size * (1.0 + options->size_sensitivity);
if (size * SUBSAMPLE < 1.0)
size = 1.0 / SUBSAMPLE;
/* Add brush angle/aspect to tilt vectorially */
/* I'm not happy with the way the brush widget info is combined with
* tilt info from the brush. My personal feeling is that
* representing both as affine transforms would make the most
* sense. -RLL
*/
tscale = options->tilt_sensitivity * 10.0;
tscale_c = tscale * cos (gimp_deg_to_rad (options->tilt_angle));
tscale_s = tscale * sin (gimp_deg_to_rad (options->tilt_angle));
x = (options->blob_aspect * cos (options->blob_angle) +
xtilt * tscale_c - ytilt * tscale_s);
y = (options->blob_aspect * sin (options->blob_angle) +
ytilt * tscale_c + xtilt * tscale_s);
#ifdef VERBOSE
g_printerr ("angle %g aspect %g; %g %g; %g %g\n",
options->blob_angle, options->blob_aspect,
tscale_c, tscale_s, x, y);
#endif
aspect = sqrt (x * x + y * y);
if (aspect != 0)
{
tcos = x / aspect;
tsin = y / aspect;
}
else
{
tsin = sin (options->blob_angle);
tcos = cos (options->blob_angle);
}
aspect = CLAMP (aspect, 1.0, 10.0);
radmin = MAX (1.0, SUBSAMPLE * size / aspect);
switch (options->blob_type)
{
case GIMP_INK_BLOB_TYPE_ELLIPSE:
blob_function = blob_ellipse;
break;
case GIMP_INK_BLOB_TYPE_SQUARE:
blob_function = blob_square;
break;
case GIMP_INK_BLOB_TYPE_DIAMOND:
blob_function = blob_diamond;
break;
default:
g_return_val_if_reached (NULL);
break;
}
return (* blob_function) (x_center * SUBSAMPLE,
y_center * SUBSAMPLE,
radmin * aspect * tcos,
radmin * aspect * tsin,
-radmin * tsin,
radmin * tcos);
}
static void
time_smoother_init (GimpInk *ink,
guint32 initval)
{
gint i;
ink->ts_index = 0;
for (i = 0; i < TIME_SMOOTHER_BUFFER; i++)
ink->ts_buffer[i] = initval;
}
static guint32
time_smoother_result (GimpInk *ink)
{
gint i;
guint64 result = 0;
for (i = 0; i < TIME_SMOOTHER_BUFFER; i++)
result += ink->ts_buffer[i];
return (result / (guint64) TIME_SMOOTHER_BUFFER);
}
static void
time_smoother_add (GimpInk *ink,
guint32 value)
{
guint64 long_value = (guint64) value;
/* handle wrap-around of time values */
if (long_value < ink->ts_buffer[ink->ts_index])
long_value += (guint64) + G_MAXUINT32;
ink->ts_buffer[ink->ts_index++] = long_value;
ink->ts_buffer[ink->ts_index++] = value;
if (ink->ts_index == TIME_SMOOTHER_BUFFER)
ink->ts_index = 0;
}
static void
dist_smoother_init (GimpInk *ink,
gdouble initval)
{
gint i;
ink->dt_index = 0;
for (i = 0; i < DIST_SMOOTHER_BUFFER; i++)
ink->dt_buffer[i] = initval;
}
static gdouble
dist_smoother_result (GimpInk *ink)
{
gint i;
gdouble result = 0.0;
for (i = 0; i < DIST_SMOOTHER_BUFFER; i++)
result += ink->dt_buffer[i];
return (result / (gdouble) DIST_SMOOTHER_BUFFER);
}
static void
dist_smoother_add (GimpInk *ink,
gdouble value)
{
ink->dt_buffer[ink->dt_index++] = value;
if (ink->dt_index == DIST_SMOOTHER_BUFFER)
ink->dt_index = 0;
}
/*********************************/
/* Rendering functions */
/*********************************/
/* Some of this stuff should probably be combined with the
* code it was copied from in paint_core.c; but I wanted
* to learn this stuff, so I've kept it simple.
*
* The following only supports CONSTANT mode. Incremental
* would, I think, interact strangely with the way we
* do things. But it wouldn't be hard to implement at all.
*/
enum { ROW_START, ROW_STOP };
/* The insertion sort here, for SUBSAMPLE = 8, tends to beat out
* qsort() by 4x with CFLAGS=-O2, 2x with CFLAGS=-g
*/
static void
insert_sort (gint *data,
gint n)
{
gint i, j, k;
gint tmp1, tmp2;
for (i = 2; i < 2 * n; i += 2)
{
tmp1 = data[i];
tmp2 = data[i + 1];
j = 0;
while (data[j] < tmp1)
j += 2;
for (k = i; k > j; k -= 2)
{
data[k] = data[k - 2];
data[k + 1] = data[k - 1];
}
data[j] = tmp1;
data[j + 1] = tmp2;
}
}
static void
fill_run (guchar *dest,
guchar alpha,
gint w)
{
if (alpha == 255)
{
memset (dest, 255, w);
}
else
{
while (w--)
{
*dest = MAX (*dest, alpha);
dest++;
}
}
}
static void
render_blob_line (Blob *blob,
guchar *dest,
gint x,
gint y,
gint width)
{
gint buf[4 * SUBSAMPLE];
gint *data = buf;
gint n = 0;
gint i, j;
gint current = 0; /* number of filled rows at this point
* in the scan line
*/
gint last_x;
/* Sort start and ends for all lines */
j = y * SUBSAMPLE - blob->y;
for (i = 0; i < SUBSAMPLE; i++)
{
if (j >= blob->height)
break;
if ((j > 0) && (blob->data[j].left <= blob->data[j].right))
{
data[2 * n] = blob->data[j].left;
data[2 * n + 1] = ROW_START;
data[2 * SUBSAMPLE + 2 * n] = blob->data[j].right;
data[2 * SUBSAMPLE + 2 * n + 1] = ROW_STOP;
n++;
}
j++;
}
/* If we have less than SUBSAMPLE rows, compress */
if (n < SUBSAMPLE)
{
for (i = 0; i < 2 * n; i++)
data[2 * n + i] = data[2 * SUBSAMPLE + i];
}
/* Now count start and end separately */
n *= 2;
insert_sort (data, n);
/* Discard portions outside of tile */
while ((n > 0) && (data[0] < SUBSAMPLE*x))
{
if (data[1] == ROW_START)
current++;
else
current--;
data += 2;
n--;
}
while ((n > 0) && (data[2*(n-1)] >= SUBSAMPLE*(x+width)))
n--;
/* Render the row */
last_x = 0;
for (i = 0; i < n;)
{
gint cur_x = data[2 * i] / SUBSAMPLE - x;
gint pixel;
/* Fill in portion leading up to this pixel */
if (current && cur_x != last_x)
fill_run (dest + last_x, (255 * current) / SUBSAMPLE, cur_x - last_x);
/* Compute the value for this pixel */
pixel = current * SUBSAMPLE;
while (i<n)
{
gint tmp_x = data[2 * i] / SUBSAMPLE;
if (tmp_x - x != cur_x)
break;
if (data[2 * i + 1] == ROW_START)
{
current++;
pixel += ((tmp_x + 1) * SUBSAMPLE) - data[2 * i];
}
else
{
current--;
pixel -= ((tmp_x + 1) * SUBSAMPLE) - data[2 * i];
}
i++;
}
dest[cur_x] = MAX (dest[cur_x], (pixel * 255) / (SUBSAMPLE * SUBSAMPLE));
last_x = cur_x + 1;
}
if (current != 0)
fill_run (dest + last_x, (255 * current)/ SUBSAMPLE, width - last_x);
}
static void
render_blob (Blob *blob,
PixelRegion *dest)
{
gint i;
gint h;
guchar *s;
gpointer pr;
for (pr = pixel_regions_register (1, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
h = dest->h;
s = dest->data;
for (i=0; i<h; i++)
{
render_blob_line (blob, s,
dest->x, dest->y + i, dest->w);
s += dest->rowstride;
}
}
}
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