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tuxpaint-pencil-sharpener/magic/src/reflection.c
Bill Kendrick e80254df51 Ran indent.sh to re-indent all source code
2025-03-24 19:33:13 -07:00

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/*
reflection.c
Reflection Magic Tool Plugin
Tux Paint - A simple drawing program for children.
Copyright (c) 2021-2024 by Bill Kendrick and others; see AUTHORS.txt
bill@newbreedsoftware.com
https://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: October 7, 2024
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
#define REFLECTION_XOR_SIZE 10
/* Our globals: */
static Mix_Chunk *reflection_snd;
int reflection_x1, reflection_y1;
enum reflection_sides
{
REFLECTION_SIDE_TOP,
REFLECTION_SIDE_LEFT,
REFLECTION_SIDE_BOTTOM,
REFLECTION_SIDE_RIGHT
};
int reflection_side_old;
/* Local function prototypes: */
int reflection_init(magic_api * api, Uint8 disabled_features, Uint8 complexity_level);
Uint32 reflection_api_version(void);
int reflection_get_tool_count(magic_api * api);
SDL_Surface *reflection_get_icon(magic_api * api, int which);
char *reflection_get_name(magic_api * api, int which);
int reflection_get_group(magic_api * api, int which);
int reflection_get_order(int which);
char *reflection_get_description(magic_api * api, int which, int mode);
void reflection_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 do_reflection(magic_api * api, SDL_Surface * canvas, SDL_Surface * last,
int x, int y, SDL_Rect * update_rect, int show_origin);
void reflection_click(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void reflection_release(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void reflection_shutdown(magic_api * api);
void reflection_set_color(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * last, Uint8 r, Uint8 g, Uint8 b, SDL_Rect * update_rect);
int reflection_requires_colors(magic_api * api, int which);
void reflection_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void reflection_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
int reflection_modes(magic_api * api, int which);
Uint8 reflection_accepted_sizes(magic_api * api, int which, int mode);
Uint8 reflection_default_size(magic_api * api, int which, int mode);
void reflection_set_size(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * last, Uint8 size, SDL_Rect * update_rect);
int reflection_init(magic_api *api, Uint8 disabled_features ATTRIBUTE_UNUSED, Uint8 complexity_level ATTRIBUTE_UNUSED)
{
char fname[1024];
snprintf(fname, sizeof(fname), "%ssounds/magic/reflection.ogg", api->data_directory);
reflection_snd = Mix_LoadWAV(fname);
return (1);
}
Uint32 reflection_api_version(void)
{
return (TP_MAGIC_API_VERSION);
}
int reflection_get_tool_count(magic_api *api ATTRIBUTE_UNUSED)
{
return (1);
}
SDL_Surface *reflection_get_icon(magic_api *api, int which ATTRIBUTE_UNUSED)
{
char fname[1024];
snprintf(fname, sizeof(fname), "%simages/magic/reflection.png", api->data_directory); /* FIXME */
return (IMG_Load(fname));
}
char *reflection_get_name(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return (strdup(gettext("Reflection")));
}
int reflection_get_group(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return MAGIC_TYPE_PICTURE_WARPS;
}
int reflection_get_order(int which ATTRIBUTE_UNUSED)
{
return 400;
}
char *reflection_get_description(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
return (strdup(gettext("Click and drag the mouse around to add a reflection to your picture.")));
}
void reflection_drag(magic_api *api, int which ATTRIBUTE_UNUSED,
SDL_Surface *canvas, SDL_Surface *last,
int ox ATTRIBUTE_UNUSED, int oy ATTRIBUTE_UNUSED, int x, int y, SDL_Rect *update_rect)
{
do_reflection(api, canvas, last, x, y, update_rect, 1);
}
void do_reflection(magic_api *api, SDL_Surface *canvas,
SDL_Surface *last, int x, int y, SDL_Rect *update_rect, int show_origin)
{
float scale;
int xx, yy;
SDL_Rect src, dest;
int reflection_side;
int update_all = 0;
if (x <= 0)
x = 1;
else if (x >= canvas->w)
x = canvas->w - 1;
if (y <= 0)
y = 1;
else if (y >= canvas->h)
y = canvas->h - 1;
/* Determine what direction to go */
if (abs(x - reflection_x1) < 32)
{
/* +/-32 pixels of wiggle room before we switch from vertical to horizontal */
if (y > reflection_y1)
reflection_side = REFLECTION_SIDE_BOTTOM;
else
reflection_side = REFLECTION_SIDE_TOP;
}
else
{
if (x < reflection_x1)
reflection_side = REFLECTION_SIDE_LEFT;
else
reflection_side = REFLECTION_SIDE_RIGHT;
}
/* If we've changed direction, reset the canvas back
to the snapshot before proceeding */
if (reflection_side != reflection_side_old)
{
SDL_BlitSurface(last, NULL, canvas, NULL);
reflection_side_old = reflection_side;
update_all = 1;
}
/* Note: This isn't very good, and I basically
brute-forced the code until it seemed to work
well enough. There's a ton of room for improvement!
-bjk 2021.11.05 */
if (reflection_side == REFLECTION_SIDE_BOTTOM)
{
/* Starting from `reflection_y1` and moving down,
we'll copy from `reflection_y1` and moving up */
scale = (float)reflection_y1 / (float)y;
for (yy = reflection_y1; yy < canvas->h; yy++)
{
dest.x = 0;
dest.y = yy;
dest.w = canvas->w;
dest.h = 1;
src.x = 0;
src.y = (reflection_y1 * scale) + ((y - yy) * scale);
src.w = canvas->w;
src.h = 1;
if (src.y < 0)
{
src.y = yy;
}
SDL_BlitSurface(last, &src, canvas, &dest);
}
update_rect->x = 0;
update_rect->y = reflection_y1;
update_rect->w = canvas->w;
update_rect->h = canvas->h - reflection_y1 + 1;
}
else if (reflection_side == REFLECTION_SIDE_TOP)
{
/* Starting from `reflection_y1` and moving up,
we'll copy from `reflection_y1` and moving down */
scale = ((float)reflection_y1 / (float)y);
for (yy = reflection_y1; yy >= 0; yy--)
{
dest.x = 0;
dest.y = yy;
dest.w = canvas->w;
dest.h = 1;
src.x = 0;
src.y = (reflection_y1 / scale) + (y * scale) - (yy / scale);
src.w = canvas->w;
src.h = 1;
if (src.y >= canvas->h)
{
src.y = yy;
}
SDL_BlitSurface(last, &src, canvas, &dest);
}
update_rect->x = 0;
update_rect->y = 0;
update_rect->w = canvas->w;
update_rect->h = reflection_y1;
}
else if (reflection_side == REFLECTION_SIDE_RIGHT)
{
/* Starting from `reflection_x1` and moving right,
we'll copy from `reflection_x1` and moving left */
scale = (float)reflection_x1 / (float)x;
for (xx = reflection_x1; xx < canvas->w; xx++)
{
dest.x = xx;
dest.y = 0;
dest.w = 1;
dest.h = canvas->h;
src.x = (reflection_x1 * scale) + ((x - xx) * scale);
src.y = 0;
src.w = 1;
src.h = canvas->h;
if (src.x < 0)
{
src.x = xx;
}
SDL_BlitSurface(last, &src, canvas, &dest);
}
update_rect->x = reflection_x1;
update_rect->y = 0;
update_rect->w = canvas->w - reflection_x1 + 1;
update_rect->h = canvas->h;
}
else if (reflection_side == REFLECTION_SIDE_LEFT)
{
/* Starting from `reflection_x1` and left up,
we'll copy from `reflection_x1` and right down */
scale = (float)reflection_x1 / (float)x;
for (xx = reflection_x1; xx >= 0; xx--)
{
dest.x = xx;
dest.y = 0;
dest.w = 1;
dest.h = canvas->h;
src.x = (reflection_x1 / scale) + (x * scale) - (xx / scale);
src.y = 0;
src.w = 1;
src.h = canvas->h;
if (src.x >= canvas->w)
{
src.x = xx;
}
SDL_BlitSurface(last, &src, canvas, &dest);
}
update_rect->x = 0;
update_rect->y = 0;
update_rect->w = reflection_x1;
update_rect->h = canvas->h;
}
/* TODO: Support reflecting at arbitrary angles!
(a la linear gradient fill tool) */
if (update_all)
{
update_rect->x = 0;
update_rect->y = 0;
update_rect->w = canvas->w;
update_rect->h = canvas->h;
}
else
{
for (yy = reflection_y1 - REFLECTION_XOR_SIZE; yy < reflection_y1 + REFLECTION_XOR_SIZE; yy++)
{
if (show_origin)
api->xorpixel(canvas, reflection_x1, yy);
else
api->putpixel(canvas, reflection_x1, yy, api->getpixel(last, reflection_x1, yy));
}
for (xx = reflection_x1 - REFLECTION_XOR_SIZE; xx < reflection_x1 + REFLECTION_XOR_SIZE; xx++)
{
if (show_origin)
api->xorpixel(canvas, xx, reflection_y1);
else
api->putpixel(canvas, xx, reflection_y1, api->getpixel(last, xx, reflection_y1));
}
update_rect->x -= REFLECTION_XOR_SIZE;
update_rect->w += (REFLECTION_XOR_SIZE * 2);
update_rect->y -= REFLECTION_XOR_SIZE;
update_rect->h += (REFLECTION_XOR_SIZE * 2);
}
api->playsound(reflection_snd, (x * 255) / canvas->w, (y * 255) / canvas->h);
}
void reflection_click(magic_api *api, int which, int mode ATTRIBUTE_UNUSED,
SDL_Surface *canvas, SDL_Surface *last, int x, int y, SDL_Rect *update_rect)
{
if (x <= 0)
x = 1;
else if (x >= canvas->w)
x = canvas->w - 1;
if (y <= 0)
y = 1;
else if (y >= canvas->h)
y = canvas->h - 1;
reflection_x1 = x;
reflection_y1 = y - 1;
reflection_side_old = REFLECTION_SIDE_BOTTOM;
reflection_drag(api, which, canvas, last, x, y, x, y, update_rect);
}
void reflection_release(magic_api *api, int which ATTRIBUTE_UNUSED,
SDL_Surface *canvas, SDL_Surface *last, int x, int y, SDL_Rect *update_rect)
{
do_reflection(api, canvas, last, x, y, update_rect, 0);
}
void reflection_shutdown(magic_api *api ATTRIBUTE_UNUSED)
{
if (reflection_snd != NULL)
Mix_FreeChunk(reflection_snd);
}
void reflection_set_color(magic_api *api ATTRIBUTE_UNUSED,
int which ATTRIBUTE_UNUSED,
SDL_Surface *canvas ATTRIBUTE_UNUSED,
SDL_Surface *last ATTRIBUTE_UNUSED,
Uint8 r ATTRIBUTE_UNUSED, Uint8 g ATTRIBUTE_UNUSED,
Uint8 b ATTRIBUTE_UNUSED, SDL_Rect *update_rect ATTRIBUTE_UNUSED)
{
}
int reflection_requires_colors(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return 0;
}
void reflection_switchin(magic_api *api ATTRIBUTE_UNUSED,
int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED, SDL_Surface *canvas)
{
reflection_x1 = canvas->w / 2;
reflection_y1 = canvas->h / 2;
}
void reflection_switchout(magic_api *api ATTRIBUTE_UNUSED,
int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED, SDL_Surface *canvas ATTRIBUTE_UNUSED)
{
}
int reflection_modes(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return MODE_PAINT;
}
Uint8 reflection_accepted_sizes(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
return 0;
}
Uint8 reflection_default_size(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
return 0;
}
void reflection_set_size(magic_api *api ATTRIBUTE_UNUSED,
int which ATTRIBUTE_UNUSED,
int mode ATTRIBUTE_UNUSED,
SDL_Surface *canvas ATTRIBUTE_UNUSED,
SDL_Surface *last ATTRIBUTE_UNUSED,
Uint8 size ATTRIBUTE_UNUSED, SDL_Rect *update_rect ATTRIBUTE_UNUSED)
{
}
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