361 lines
9.5 KiB
C
361 lines
9.5 KiB
C
/* halftone.c
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Last modified: 2011.07.17
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*/
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/* Inclusion of header files: */
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/* -------------------------- */
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#include <stdio.h>
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#include <string.h>
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#include <libintl.h>
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#include <math.h>
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#include "tp_magic_api.h"
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#include "SDL_image.h"
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#include "SDL_mixer.h"
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enum {
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TOOL_HALFTONE,
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NUM_TOOLS
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};
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const char * snd_filenames[NUM_TOOLS] = {
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"halftone.wav",
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};
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const char * icon_filenames[NUM_TOOLS] = {
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"halftone.png",
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};
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const char * names[NUM_TOOLS] = {
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gettext_noop("Halftone"),
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};
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const char * descs[NUM_TOOLS] = {
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gettext_noop("Click and drag to turn your drawing into a newspaper."),
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};
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Mix_Chunk * snd_effect[NUM_TOOLS];
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static SDL_Surface * canvas_backup, * square;
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/* Function Prototypes: */
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void halftone_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * snapshot, int ox, int oy, int x, int y,
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SDL_Rect * update_rect);
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void halftone_line_callback(void * ptr, int which,
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SDL_Surface * canvas, SDL_Surface * snapshot,
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int x, int y);
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Uint32 halftone_api_version(void);
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int halftone_init(magic_api * api);
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int halftone_get_tool_count(magic_api * api);
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SDL_Surface * halftone_get_icon(magic_api * api, int which);
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char * halftone_get_name(magic_api * api, int which);
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char * halftone_get_description(magic_api * api, int which, int mode);
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int halftone_requires_colors(magic_api * api, int which);
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int halftone_modes(magic_api * api, int which);
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void halftone_shutdown(magic_api * api);
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void halftone_click(magic_api * api, int which, int mode,
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SDL_Surface * canvas, SDL_Surface * snapshot,
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int x, int y, SDL_Rect * update_rect);
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void halftone_release(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * snapshot,
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int x, int y, SDL_Rect * update_rect);
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void halftone_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
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void halftone_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
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void halftone_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
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void halftone_rgb2cmyk(Uint8 r, Uint8 g, Uint8 b, float cmyk[]);
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Uint32 halftone_api_version(void)
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{
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return(TP_MAGIC_API_VERSION);
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}
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int halftone_init(magic_api * api)
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{
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int i;
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char fname[1024];
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canvas_backup = NULL;
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square = NULL;
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for (i = 0; i < NUM_TOOLS; i++)
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{
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snprintf(fname, sizeof(fname),
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"%s/sounds/magic/%s",
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api->data_directory, snd_filenames[i]);
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/* FIXME snd_effect[i] = Mix_LoadWAV(fname);
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if (snd_effect[i] == NULL) {
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SDL_FreeSurface(canvas_backup);
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SDL_FreeSurface(square);
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return(0);
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}
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*/
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}
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return(1);
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}
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int halftone_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
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{
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return(NUM_TOOLS);
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}
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SDL_Surface * halftone_get_icon(magic_api * api, int which)
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{
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char fname[1024];
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snprintf(fname, sizeof(fname), "%s/images/magic/%s",
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api->data_directory, icon_filenames[which]);
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return(IMG_Load(fname));
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}
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char * halftone_get_name(magic_api * api ATTRIBUTE_UNUSED, int which)
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{
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const char * our_name_english;
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const char * our_name_localized;
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our_name_english = names[which];
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our_name_localized = gettext(our_name_english);
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return(strdup(our_name_localized));
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}
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char * halftone_get_description(magic_api * api ATTRIBUTE_UNUSED, int which, int mode ATTRIBUTE_UNUSED)
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{
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const char * our_desc_english;
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const char * our_desc_localized;
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our_desc_english = descs[which];
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our_desc_localized = gettext(our_desc_english);
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return(strdup(our_desc_localized));
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}
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int halftone_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return 0;
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}
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int halftone_modes(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return MODE_PAINT;
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}
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void halftone_shutdown(magic_api * api ATTRIBUTE_UNUSED)
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{
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int i;
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for (i = 0; i < NUM_TOOLS; i++)
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Mix_FreeChunk(snd_effect[i]);
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SDL_FreeSurface(canvas_backup);
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SDL_FreeSurface(square);
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}
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void halftone_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
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SDL_Surface * canvas, SDL_Surface * snapshot,
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int x, int y, SDL_Rect * update_rect)
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{
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halftone_drag(api, which, canvas, snapshot, x, y, x, y, update_rect);
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}
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void halftone_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * snapshot, int ox, int oy, int x, int y,
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SDL_Rect * update_rect)
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{
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api->line((void *) api, which, canvas, snapshot,
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ox, oy, x, y, 4, halftone_line_callback);
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if (ox > x) { int tmp = ox; ox = x; x = tmp; }
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if (oy > y) { int tmp = oy; oy = y; y = tmp; }
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update_rect->x = ox - 16;
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update_rect->y = oy - 16;
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update_rect->w = (x + 16) - update_rect->x;
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update_rect->h = (y + 16) - update_rect->h;
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/* FIXME
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api->playsound(snd_effect[which],
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(x * 255) / canvas->w, // pan
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255); // distance
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*/
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}
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enum {
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CHAN_CYAN,
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CHAN_MAGENTA,
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CHAN_YELLOW,
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CHAN_BLACK,
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NUM_CHANS
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};
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Uint8 chan_colors[NUM_CHANS][3] = {
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{ 0, 255, 255 },
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{ 255, 0, 255 },
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{ 255, 255, 0 },
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{ 0, 0, 0 }
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};
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int chan_angles[NUM_CHANS] = {
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100,
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15,
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0,
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45
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};
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void halftone_release(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * snapshot ATTRIBUTE_UNUSED,
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int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED,
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SDL_Rect * update_rect ATTRIBUTE_UNUSED)
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{
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}
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void halftone_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 r ATTRIBUTE_UNUSED,
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Uint8 g ATTRIBUTE_UNUSED, Uint8 b ATTRIBUTE_UNUSED)
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{
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}
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void halftone_line_callback(void * ptr, int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas, SDL_Surface * snapshot ATTRIBUTE_UNUSED,
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int x, int y)
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{
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Uint8 r, g, b, or, og, ob;
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Uint32 total_r, total_g, total_b;
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Uint32 pixel;
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int xx, yy, xxx, yyy, channel, ox, oy, sqx, sqy;
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SDL_Rect dest;
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magic_api * api = (magic_api *) ptr;
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float cmyk[4];
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pixel = SDL_MapRGB(square->format, 255, 255, 255);
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SDL_FillRect(square, NULL, pixel);
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/* Lock to grid, centered around mouse */
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x = ((x / 8) - 1) * 8;
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y = ((y / 8) - 1) * 8;
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if (api->touched(x, y)) { return; }
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for (xx = 0; xx < 16; xx = xx + 4) {
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for (yy = 0; yy < 16; yy = yy + 4) {
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/* Get avg color around the mouse */
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total_r = total_g = total_b = 0;
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for (xxx = 0; xxx < 4; xxx++) {
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for (yyy = 0; yyy < 4; yyy++) {
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SDL_GetRGB(api->getpixel(canvas_backup, x + xx + xxx, y + yy + yyy), canvas_backup->format, &r, &g, &b);
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total_r += r;
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total_g += g;
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total_b += b;
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}
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}
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total_r /= 16;
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total_g /= 16;
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total_b /= 16;
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/* Convert to CMYK values */
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halftone_rgb2cmyk(total_r, total_g, total_b, cmyk);
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/* Draw C, M, Y and K blobs into our 'square' surface */
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for (channel = 0; channel < NUM_CHANS; channel++) {
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r = chan_colors[channel][0];
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g = chan_colors[channel][1];
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b = chan_colors[channel][2];
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for (xxx = 0; xxx < 8; xxx++) {
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for (yyy = 0; yyy < 8; yyy++) {
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/* A circle blob, radius based upon channel (C, M, Y or K) strength for this color */
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/* FIXME: Base it upon this channel's angle! -bjk 2011.07.17 */
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ox = xxx;
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oy = yyy;
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sqx = (xx + ox) % 16;
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sqy = (yy + oy) % 16;
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if (api->in_circle(xxx - 4, yyy - 4, cmyk[channel] * 6.0)) {
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SDL_GetRGB(api->getpixel(square, sqx, sqy), square->format, &or, &og, &ob);
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if (or == 255 && og == 255 && ob == 255) {
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/* If it's just white, put full color down */
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pixel = SDL_MapRGB(square->format, r, g, b);
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} else {
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/* Otherwise, blend a little */
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pixel = SDL_MapRGB(square->format, (r + or) / 2, (g + og) / 2, (b + ob) / 2);
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}
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api->putpixel(square, sqx, sqy, pixel);
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}
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}
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}
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}
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}
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}
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dest.x = x;
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dest.y = y;
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SDL_BlitSurface(square, NULL, canvas, &dest);
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}
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void halftone_switchin(magic_api * api, int which ATTRIBUTE_UNUSED,
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int mode ATTRIBUTE_UNUSED, SDL_Surface * canvas)
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{
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if (canvas_backup == NULL)
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canvas_backup = SDL_CreateRGBSurface(SDL_ANYFORMAT, api->canvas_w, api->canvas_h, canvas->format->BitsPerPixel, canvas->format->Rmask, canvas->format->Gmask, canvas->format->Bmask, canvas->format->Amask);
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if (square == NULL)
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square = SDL_CreateRGBSurface(SDL_ANYFORMAT, 16, 16, canvas->format->BitsPerPixel, canvas->format->Rmask, canvas->format->Gmask, canvas->format->Bmask, canvas->format->Amask);
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/* FIXME: What to do if they come back NULL!? :( */
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SDL_BlitSurface(canvas, NULL, canvas_backup, NULL);
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}
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void halftone_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
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int mode ATTRIBUTE_UNUSED, SDL_Surface * canvas ATTRIBUTE_UNUSED)
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{
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}
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void halftone_rgb2cmyk(Uint8 r, Uint8 g, Uint8 b, float cmyk[])
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{
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float mincmy, c, m, y, k;
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/* Simple RGB to CMYK math (not worrying about color profiles, etc.),
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based on math found at http://www.javascripter.net/faq/rgb2cmyk.htm
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by Alexei Kourbatov <alexei@kourbatov.com> */
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if (r == 0 && g == 0 && b == 0)
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{
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/* Black */
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c = 0.0;
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m = 0.0;
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y = 0.0;
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k = 1.0;
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}
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else
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{
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c = 1.0 - (((float) r) / 255.0);
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m = 1.0 - (((float) g) / 255.0);
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y = 1.0 - (((float) b) / 255.0);
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mincmy = min(c, min(m, y));
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c = (c - mincmy) / (1.0 - mincmy);
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m = (m - mincmy) / (1.0 - mincmy);
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y = (y - mincmy) / (1.0 - mincmy);
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k = mincmy;
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}
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cmyk[0] = c;
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cmyk[1] = m;
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cmyk[2] = y;
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cmyk[3] = k;
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}
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