New magic tool: Pixels
Suitable for simple 'pixel art'. Draws 8x8 pixel rectangles on a grid across the canvas. Sound effect created via a small Atari BASIC program sampled in the open source 'Atari800' emulator (emulating the POKEY sound chip), and trimmed in Audacity.
This commit is contained in:
Bill Kendrick
parent
0bb663de04
commit
4049b6cbbc
8 changed files with 239 additions and 6 deletions
213
magic/src/pixels.c
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magic/src/pixels.c
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/*
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pixels.c
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Pixel art paintbrush Magic Tools Plugin
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Tux Paint - A simple drawing program for children.
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Copyright (c) 2021 by Bill Kendrick and others; see AUTHORS.txt
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bill@newbreedsoftware.com
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http://www.tuxpaint.org/
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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(See COPYING.txt)
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Last updated: January 6, 2021
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$Id$
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*/
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#include <stdio.h>
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#include <string.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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/* What tools we contain: */
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enum
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{
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TOOL_PIXELS,
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NUM_TOOLS
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};
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/* Our globals: */
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static Mix_Chunk *pixel_snd;
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static Uint8 pixels_r, pixels_g, pixels_b;
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/* Local function prototype: */
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int pixels_init(magic_api * api);
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Uint32 pixels_api_version(void);
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int pixels_get_tool_count(magic_api * api);
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SDL_Surface *pixels_get_icon(magic_api * api, int which);
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char *pixels_get_name(magic_api * api, int which);
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char *pixels_get_description(magic_api * api, int which, int mode);
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void pixels_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect);
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void pixels_click(magic_api * api, int which, int mode,
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SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
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void pixels_release(magic_api * api, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
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void pixels_shutdown(magic_api * api);
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void pixels_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
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int pixels_requires_colors(magic_api * api, int which);
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void pixels_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
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void pixels_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
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int pixels_modes(magic_api * api, int which);
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// No setup required:
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int pixels_init(magic_api * api)
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{
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char fname[1024];
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snprintf(fname, sizeof(fname), "%s/sounds/magic/pixels.ogg", api->data_directory);
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pixel_snd = Mix_LoadWAV(fname);
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return (1);
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}
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Uint32 pixels_api_version(void)
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{
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return (TP_MAGIC_API_VERSION);
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}
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// We have multiple tools:
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int pixels_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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// Load our icons:
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SDL_Surface *pixels_get_icon(magic_api * api, int which ATTRIBUTE_UNUSED)
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{
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char fname[1024];
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snprintf(fname, sizeof(fname), "%s/images/magic/pixels.png", api->data_directory);
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return (IMG_Load(fname));
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}
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// Return our names, localized:
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char *pixels_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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/* Both are named "Pixels", at the moment: */
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return (strdup(gettext_noop("Pixels")));
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}
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// Return our descriptions, localized:
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char *pixels_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
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{
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return (strdup(gettext_noop("Click and drag to draw large pixels.")));
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return (NULL);
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}
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// Do the effect:
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static void do_pixels(void *ptr ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas, SDL_Surface * last ATTRIBUTE_UNUSED, int x, int y)
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{
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SDL_Rect dest;
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int pixel_size;
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pixel_size = 8;
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dest.x = (x / pixel_size) * pixel_size;
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dest.y = (y / pixel_size) * pixel_size;
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dest.w = pixel_size;
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dest.h = pixel_size;
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SDL_FillRect(canvas, &dest, SDL_MapRGB(canvas->format, pixels_r, pixels_g, pixels_b));
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}
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// Affect the canvas on drag:
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void pixels_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect)
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{
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api->line((void *)api, which, canvas, last, ox, oy, x, y, 1, do_pixels);
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if (ox > x)
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{
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int tmp = ox;
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ox = x;
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x = tmp;
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}
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if (oy > y)
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{
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int tmp = oy;
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oy = y;
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y = tmp;
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}
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update_rect->x = x - 64;
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update_rect->y = y - 64;
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update_rect->w = (ox + 128) - update_rect->x;
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update_rect->h = (oy + 128) - update_rect->h;
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api->playsound(pixel_snd, (x * 255) / canvas->w, 255);
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}
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// Affect the canvas on click:
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void pixels_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
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SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
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{
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pixels_drag(api, which, canvas, last, x, y, x, y, update_rect);
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}
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void pixels_release(magic_api * api, int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * last ATTRIBUTE_UNUSED,
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int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
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{
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api->stopsound();
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}
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// No setup happened:
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void pixels_shutdown(magic_api * api ATTRIBUTE_UNUSED)
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{
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if (pixel_snd != NULL)
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Mix_FreeChunk(pixel_snd);
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}
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// Record the color from Tux Paint:
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void pixels_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 r, Uint8 g, Uint8 b)
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{
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pixels_r = r;
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pixels_g = g;
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pixels_b = b;
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}
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// Use colors:
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int pixels_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return 1;
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}
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void pixels_switchin(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 pixels_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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int pixels_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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