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tuxpaint-pencil-sharpener/magic/src/halftone.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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/* halftone.c
Last updated: October 7, 2024
*/
/* Inclusion of header files: */
/* -------------------------- */
#include <stdio.h>
#include <string.h>
#include <libintl.h>
#include <math.h>
#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
#define deg_cos(x) cos((x) * M_PI / 180.0)
#define deg_sin(x) sin((x) * M_PI / 180.0)
#define GRID_SIZE 16 /* Size of the grid, and hence max size of the circle (it may fill more, into a square shape) */
#define OFFSET_RADIUS 2 /* Radius for when offsetting C, M, Y, and K colors by their angles (see `chan_angles[]`) */
enum
{
TOOL_HALFTONE,
NUM_TOOLS
};
const char *snd_filenames[NUM_TOOLS] = {
"halftone.ogg",
};
const char *icon_filenames[NUM_TOOLS] = {
"halftone.png",
};
const char *names[NUM_TOOLS] = {
gettext_noop("Halftone"),
};
const int groups[NUM_TOOLS] = {
MAGIC_TYPE_DISTORTS,
};
const int orders[NUM_TOOLS] = {
2200,
};
const char *descs[NUM_TOOLS][2] = {
{
gettext_noop("Click and drag to turn your drawing into a newspaper."),
gettext_noop("Click to turn your drawing into a newspaper."),
},
};
Mix_Chunk *snd_effect[NUM_TOOLS];
static SDL_Surface *canvas_backup, *square;
/* Function Prototypes: */
void halftone_drag(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect);
void halftone_line_callback(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
Uint32 halftone_api_version(void);
int halftone_init(magic_api * api, Uint8 disabled_features, Uint8 complexity_level);
int halftone_get_tool_count(magic_api * api);
SDL_Surface *halftone_get_icon(magic_api * api, int which);
char *halftone_get_name(magic_api * api, int which);
int halftone_get_group(magic_api * api, int which);
int halftone_get_order(int which);
char *halftone_get_description(magic_api * api, int which, int mode);
int halftone_requires_colors(magic_api * api, int which);
int halftone_modes(magic_api * api, int which);
void halftone_shutdown(magic_api * api);
void halftone_click(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect);
void halftone_release(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect);
void halftone_set_color(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * last, Uint8 r, Uint8 g, Uint8 b, SDL_Rect * update_rect);
void halftone_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void halftone_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
void halftone_rgb2cmyk(Uint8 r, Uint8 g, Uint8 b, float cmyk[]);
Uint8 halftone_accepted_sizes(magic_api * api, int which, int mode);
Uint8 halftone_default_size(magic_api * api, int which, int mode);
void halftone_set_size(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * last, Uint8 size, SDL_Rect * update_rect);
Uint32 halftone_api_version(void)
{
return (TP_MAGIC_API_VERSION);
}
int halftone_init(magic_api *api, Uint8 disabled_features ATTRIBUTE_UNUSED, Uint8 complexity_level ATTRIBUTE_UNUSED)
{
int i;
char fname[1024];
canvas_backup = NULL;
square = NULL;
for (i = 0; i < NUM_TOOLS; i++)
{
snprintf(fname, sizeof(fname), "%ssounds/magic/%s", api->data_directory, snd_filenames[i]);
snd_effect[i] = Mix_LoadWAV(fname);
}
return (1);
}
int halftone_get_tool_count(magic_api *api ATTRIBUTE_UNUSED)
{
return (NUM_TOOLS);
}
SDL_Surface *halftone_get_icon(magic_api *api, int which)
{
char fname[1024];
snprintf(fname, sizeof(fname), "%simages/magic/%s", api->data_directory, icon_filenames[which]);
return (IMG_Load(fname));
}
char *halftone_get_name(magic_api *api ATTRIBUTE_UNUSED, int which)
{
const char *our_name_english;
const char *our_name_localized;
our_name_english = names[which];
our_name_localized = gettext(our_name_english);
return (strdup(our_name_localized));
}
int halftone_get_group(magic_api *api ATTRIBUTE_UNUSED, int which)
{
return groups[which];
}
int halftone_get_order(int which)
{
return orders[which];
}
char *halftone_get_description(magic_api *api ATTRIBUTE_UNUSED, int which, int mode)
{
const char *our_desc_english;
const char *our_desc_localized;
our_desc_english = descs[which][mode - 1];
our_desc_localized = gettext(our_desc_english);
return (strdup(our_desc_localized));
}
int halftone_requires_colors(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return 0;
}
int halftone_modes(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return (MODE_PAINT | MODE_FULLSCREEN);
}
void halftone_shutdown(magic_api *api ATTRIBUTE_UNUSED)
{
int i;
for (i = 0; i < NUM_TOOLS; i++)
{
if (snd_effect[i] != NULL)
{
Mix_FreeChunk(snd_effect[i]);
}
}
SDL_FreeSurface(canvas_backup);
SDL_FreeSurface(square);
}
void halftone_click(magic_api *api, int which, int mode,
SDL_Surface *canvas, SDL_Surface *snapshot, int x, int y, SDL_Rect *update_rect)
{
int full_x, full_y;
if (mode == MODE_PAINT)
{
halftone_drag(api, which, canvas, snapshot, x, y, x, y, update_rect);
}
else
{
for (full_y = 0; full_y < canvas->h; full_y += GRID_SIZE)
{
for (full_x = 0; full_x < canvas->w; full_x += GRID_SIZE)
{
halftone_line_callback(api, which, canvas, snapshot, full_x, full_y);
}
}
api->playsound(snd_effect[which], 128, 255);
update_rect->x = 0;
update_rect->y = 0;
update_rect->w = canvas->w;
update_rect->h = canvas->h;
}
}
void halftone_drag(magic_api *api, int which, SDL_Surface *canvas,
SDL_Surface *snapshot, int ox, int oy, int x, int y, SDL_Rect *update_rect)
{
api->line((void *)api, which, canvas, snapshot, ox, oy, x, y, 4, halftone_line_callback);
if (ox > x)
{
int tmp = ox;
ox = x;
x = tmp;
}
if (oy > y)
{
int tmp = oy;
oy = y;
y = tmp;
}
ox = (ox / GRID_SIZE) * GRID_SIZE + (GRID_SIZE / 2);
oy = (oy / GRID_SIZE) * GRID_SIZE + (GRID_SIZE / 2);
x = (x / GRID_SIZE) * GRID_SIZE + (GRID_SIZE / 2);
y = (y / GRID_SIZE) * GRID_SIZE + (GRID_SIZE / 2);
update_rect->x = ox - GRID_SIZE / 2;
update_rect->y = oy - GRID_SIZE / 2;
update_rect->w = (x + GRID_SIZE / 2) - update_rect->x;
update_rect->h = (y + GRID_SIZE / 2) - update_rect->y;
api->playsound(snd_effect[which], (x * 255) / canvas->w, // pan
255); // distance
}
enum
{
CHAN_CYAN,
CHAN_MAGENTA,
CHAN_YELLOW,
CHAN_BLACK,
NUM_CHANS
};
Uint8 chan_colors[NUM_CHANS][3] = {
{0, 255, 255}, /* Cyan */
{255, 0, 255}, /* Magenta */
{255, 255, 0}, /* Yellow */
{0, 0, 0} /* Black */
};
int chan_angles[NUM_CHANS] = {
75, /* Cyan */
15, /* Magenta */
90, /* Yellow */
45 /* Black */
};
void halftone_release(magic_api *api ATTRIBUTE_UNUSED,
int which ATTRIBUTE_UNUSED,
SDL_Surface *canvas ATTRIBUTE_UNUSED,
SDL_Surface *snapshot ATTRIBUTE_UNUSED,
int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED, SDL_Rect *update_rect ATTRIBUTE_UNUSED)
{
}
void halftone_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)
{
}
void halftone_line_callback(void *ptr, int which ATTRIBUTE_UNUSED,
SDL_Surface *canvas, SDL_Surface *snapshot ATTRIBUTE_UNUSED, int x, int y)
{
Uint8 r, g, b, or, og, ob;
Uint32 total_r, total_g, total_b;
int px_cnt;
Uint32 pixel;
int xxx, yyy, channel, ox, oy, sqx, sqy;
SDL_Rect dest;
magic_api *api = (magic_api *) ptr;
float cmyk[4];
/* Start the pixel with white */
pixel = SDL_MapRGB(square->format, 255, 255, 255);
SDL_FillRect(square, NULL, pixel);
/* Lock to a grid, centered around mouse */
x = (x / GRID_SIZE) * GRID_SIZE + (GRID_SIZE / 2);
y = (y / GRID_SIZE) * GRID_SIZE + (GRID_SIZE / 2);
if (api->touched(x, y))
{
return;
}
/* Get the average color around the mouse */
total_r = total_g = total_b = 0;
px_cnt = 0;
for (xxx = -(GRID_SIZE / 2); xxx < (GRID_SIZE / 2); xxx++)
{
for (yyy = -(GRID_SIZE / 2); yyy < (GRID_SIZE / 2); yyy++)
{
SDL_GetRGB(api->getpixel(canvas_backup, x + xxx, y + yyy), canvas_backup->format, &r, &g, &b);
total_r += r;
total_g += g;
total_b += b;
px_cnt++;
}
}
total_r /= px_cnt;
total_g /= px_cnt;
total_b /= px_cnt;
/* Convert the average color from RGB to CMYK values, for 'painting' later */
halftone_rgb2cmyk(total_r, total_g, total_b, cmyk);
/* Draw C, M, Y and K blobs into our 'square' surface */
for (channel = 0; channel < NUM_CHANS; channel++)
{
for (xxx = -(GRID_SIZE / 2) - 1; xxx < (GRID_SIZE / 2) + 1; xxx++)
{
for (yyy = -(GRID_SIZE / 2) - 1; yyy < (GRID_SIZE / 2) + 1; yyy++)
{
/* A circle blob, radius based upon channel (C, M, Y or K) strength for this color */
ox = xxx + deg_cos(chan_angles[channel]) * OFFSET_RADIUS;
oy = yyy + deg_sin(chan_angles[channel]) * OFFSET_RADIUS;
sqx = ((GRID_SIZE / 2) + ox) % GRID_SIZE;
sqy = ((GRID_SIZE / 2) + oy) % GRID_SIZE;
/* Use intensity of the CMKY channel in question to decide
how big of a circle to paint */
if (api->in_circle(xxx, yyy, cmyk[channel] * GRID_SIZE))
{
/* Use the pure C, Y, M, or K color to paint with */
r = chan_colors[channel][0];
g = chan_colors[channel][1];
b = chan_colors[channel][2];
/* Additively blend with whatever we have in the
'square' buffer (which starts as white)
(since the target is RGB, we use `min()`) */
SDL_GetRGB(api->getpixel(square, sqx, sqy), square->format, &or, &og, &ob);
pixel =
SDL_MapRGB(square->format, min((Uint8) (r * 2.0), or),
min((Uint8) (g * 2.0), og), min((Uint8) (b * 2.0), ob));
api->putpixel(square, sqx, sqy, pixel);
}
}
}
}
/* Copy the results to the canvas */
dest.x = x - GRID_SIZE / 2;
dest.y = y - GRID_SIZE / 2;
dest.w = GRID_SIZE;
dest.h = GRID_SIZE;
SDL_BlitSurface(square, NULL, canvas, &dest);
}
void halftone_switchin(magic_api *api, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED, SDL_Surface *canvas)
{
if (canvas_backup == NULL)
{
canvas_backup =
SDL_CreateRGBSurface(SDL_SWSURFACE, api->canvas_w, api->canvas_h,
canvas->format->BitsPerPixel,
canvas->format->Rmask, canvas->format->Gmask, canvas->format->Bmask, canvas->format->Amask);
}
if (square == NULL)
{
square =
SDL_CreateRGBSurface(SDL_SWSURFACE, GRID_SIZE, GRID_SIZE,
canvas->format->BitsPerPixel,
canvas->format->Rmask, canvas->format->Gmask, canvas->format->Bmask, canvas->format->Amask);
}
SDL_BlitSurface(canvas, NULL, canvas_backup, NULL);
}
void halftone_switchout(magic_api *api ATTRIBUTE_UNUSED,
int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED, SDL_Surface *canvas ATTRIBUTE_UNUSED)
{
}
void halftone_rgb2cmyk(Uint8 r, Uint8 g, Uint8 b, float cmyk[])
{
float mincmy, c, m, y, k;
/* Simple RGB to CMYK math (not worrying about color profiles, etc.),
based on math found at http://www.javascripter.net/faq/rgb2cmyk.htm
by Alexei Kourbatov <alexei@kourbatov.com> */
if (r == 0 && g == 0 && b == 0)
{
/* Black */
c = 0.0;
m = 0.0;
y = 0.0;
k = 1.0;
}
else
{
c = 1.0 - (((float)r) / 255.0);
m = 1.0 - (((float)g) / 255.0);
y = 1.0 - (((float)b) / 255.0);
mincmy = min(c, min(m, y));
c = (c - mincmy) / (1.0 - mincmy);
m = (m - mincmy) / (1.0 - mincmy);
y = (y - mincmy) / (1.0 - mincmy);
k = mincmy;
}
cmyk[0] = c;
cmyk[1] = m;
cmyk[2] = y;
cmyk[3] = k;
}
Uint8 halftone_accepted_sizes(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
return 0; // No size support at this time
}
Uint8 halftone_default_size(magic_api *api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
return 0; // No size support at this time
}
void halftone_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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