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tuxpaint-pencil-sharpener/magic/src/smudge.c
Bill Kendrick 1d5dd8eb9f Finished organizing Magic tools; updated docs 
Added group code to `tp_magic_example.c`, and documented
in the "Creating Tux Paint Magic Tool Plugins" docs.
2021-09-21 01:02:22 -07:00

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/*
smudge.c
Magic Tool Plugin
Tux Paint - A simple drawing program for children.
Smudge by Albert Cahalan <albert@users.sf.net>
Wet Paint addition by Bill Kendrick <bill@newbreedsoftware.com>
Copyright (c) 2002-2021
http://www.tuxpaint.org/
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
(See COPYING.txt)
Last updated: September 21, 2021
$Id$
*/
#include <stdio.h>
#include <string.h>
#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
/* Our globals: */
static Mix_Chunk *smudge_snd;
static Uint8 smudge_r, smudge_g, smudge_b;
int smudge_init(magic_api * api);
Uint32 smudge_api_version(void);
SDL_Surface *smudge_get_icon(magic_api * api, int which);
char *smudge_get_name(magic_api * api, int which);
int smudge_get_group(magic_api * api, int which);
char *smudge_get_description(magic_api * api, int which, int mode);
static void do_smudge(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y);
void smudge_drag(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect);
void smudge_click(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void smudge_release(magic_api * api, int which,
SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void smudge_shutdown(magic_api * api);
void smudge_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
int smudge_requires_colors(magic_api * api, int which);
void smudge_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void smudge_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
int smudge_modes(magic_api * api, int which);
int smudge_get_tool_count(magic_api * api);
// No setup required:
int smudge_init(magic_api * api)
{
char fname[1024];
snprintf(fname, sizeof(fname), "%s/sounds/magic/smudge.wav", api->data_directory);
smudge_snd = Mix_LoadWAV(fname);
return (1);
}
Uint32 smudge_api_version(void)
{
return (TP_MAGIC_API_VERSION);
}
// We have multiple tools:
int smudge_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
return (2);
}
// Load our icons:
SDL_Surface *smudge_get_icon(magic_api * api, int which)
{
char fname[1024];
if (which == 0)
snprintf(fname, sizeof(fname), "%s/images/magic/smudge.png", api->data_directory);
else /* if (which == 1) */
snprintf(fname, sizeof(fname), "%s/images/magic/wetpaint.png", api->data_directory);
return (IMG_Load(fname));
}
// Return our names, localized:
char *smudge_get_name(magic_api * api ATTRIBUTE_UNUSED, int which)
{
if (which == 0)
return (strdup(gettext_noop("Smudge")));
else /* if (which == 1) */
return (strdup(gettext_noop("Wet Paint")));
}
// Return our groups
int smudge_get_group(magic_api * api ATTRIBUTE_UNUSED, int which)
{
if (which == 0)
return MAGIC_TYPE_DISTORTS; /* Smudge */
else
return MAGIC_TYPE_PAINTING; /* Wet Paint */
}
// Return our descriptions, localized:
char *smudge_get_description(magic_api * api ATTRIBUTE_UNUSED, int which, int mode ATTRIBUTE_UNUSED)
{
if (which == 0)
return (strdup(gettext_noop("Click and drag the mouse around to smudge the picture.")));
else /* if (which == 1) */
return (strdup(gettext_noop("Click and drag the mouse around to draw with wet, smudgy paint.")));
}
// Do the effect:
static void do_smudge(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y)
{
magic_api *api = (magic_api *) ptr;
static double state[32][32][3];
unsigned i = 32 * 32;
double rate = api->button_down()? 0.5 : 0.0;
Uint8 r, g, b;
int xx, yy, strength;
if (which == 1)
{
/* Wet paint */
for (yy = -8; yy < 8; yy++)
for (xx = -8; xx < 8; xx++)
if (api->in_circle(xx, yy, 8))
{
SDL_GetRGB(api->getpixel(last, x + xx, y + yy), last->format, &r, &g, &b);
//strength = (abs(xx * yy) / 8) + 6;
strength = (abs(xx * yy) / 8) + 1;
api->putpixel(canvas, x + xx, y + yy, SDL_MapRGB(canvas->format,
(smudge_r + r * strength) / (strength + 1),
(smudge_g + g * strength) / (strength + 1),
(smudge_b + b * strength) / (strength + 1)));
}
}
while (i--)
{
int iy = i >> 5;
int ix = i & 0x1f;
// is it not on the circle of radius sqrt(120) at location 16,16?
if ((ix - 16) * (ix - 16) + (iy - 16) * (iy - 16) > 120)
continue;
// it is on the circle, so grab it
SDL_GetRGB(api->getpixel(canvas, x + ix - 16, y + iy - 16), last->format, &r, &g, &b);
state[ix][iy][0] = rate * state[ix][iy][0] + (1.0 - rate) * api->sRGB_to_linear(r);
state[ix][iy][1] = rate * state[ix][iy][1] + (1.0 - rate) * api->sRGB_to_linear(g);
state[ix][iy][2] = rate * state[ix][iy][2] + (1.0 - rate) * api->sRGB_to_linear(b);
// opacity 100% --> new data not blended w/ existing data
api->putpixel(canvas, x + ix - 16, y + iy - 16,
SDL_MapRGB(canvas->format, api->linear_to_sRGB(state[ix][iy][0]),
api->linear_to_sRGB(state[ix][iy][1]), api->linear_to_sRGB(state[ix][iy][2])));
}
}
// Affect the canvas on drag:
void smudge_drag(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect)
{
api->line((void *)api, which, canvas, last, ox, oy, x, y, 1, do_smudge);
api->playsound(smudge_snd, (x * 255) / canvas->w, 255);
if (ox > x)
{
int tmp = ox;
ox = x;
x = tmp;
}
if (oy > y)
{
int tmp = oy;
oy = y;
y = tmp;
}
update_rect->x = ox - 16;
update_rect->y = oy - 16;
update_rect->w = (x + 16) - update_rect->x;
update_rect->h = (y + 16) - update_rect->y;
}
// Affect the canvas on click:
void smudge_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
{
smudge_drag(api, which, canvas, last, x, y, x, y, update_rect);
}
// Affect the canvas on click:
void smudge_release(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * last ATTRIBUTE_UNUSED,
int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
{
}
// No setup happened:
void smudge_shutdown(magic_api * api ATTRIBUTE_UNUSED)
{
if (smudge_snd != NULL)
Mix_FreeChunk(smudge_snd);
}
// Record the color from Tux Paint:
void smudge_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 r, Uint8 g, Uint8 b)
{
smudge_r = r;
smudge_g = g;
smudge_b = b;
}
// Use colors:
int smudge_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
if (which == 0)
return 0;
else /* if (which == 1) */
return 1;
}
void smudge_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
}
void smudge_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
}
int smudge_modes(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return (MODE_PAINT);
}
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