628 lines
19 KiB
C
628 lines
19 KiB
C
/*
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perspective.c
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perspective, stretches the plane of the image.
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zoom, zooms in and out the image.
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Tux Paint - A simple drawing program for children.
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Credits: Andrew Corcoran <akanewbie@gmail.com>
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Copyright (c) 2002-2021 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: September 20, 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 <libintl.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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#include <math.h>
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#include <limits.h>
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#include <time.h>
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#ifndef gettext_noop
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#define gettext_noop(String) String
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#endif
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static void perspective_preview(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * last,
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int x, int y, SDL_Rect * update_rect, float step);
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Uint32 perspective_api_version(void);
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int perspective_init(magic_api * api);
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int perspective_get_tool_count(magic_api * api);
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SDL_Surface *perspective_get_icon(magic_api * api, int which);
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char *perspective_get_name(magic_api * api, int which);
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int perspective_get_group(magic_api * api, int which);
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char *perspective_get_description(magic_api * api, int which, int mode);
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void perspective_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 perspective_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 perspective_release(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
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void perspective_shutdown(magic_api * api);
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void perspective_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
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int perspective_requires_colors(magic_api * api, int which);
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void perspective_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
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void perspective_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
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int perspective_modes(magic_api * api, int which);
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int scan_fill(magic_api * api, SDL_Surface * canvas, SDL_Surface * srfc, int x, int y, int fill_edge, int fill_tile,
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int size, Uint32 color);
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void perspective_line(void *ptr_to_api, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
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/* Unused?
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static const int perspective_AMOUNT = 300;
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static const int perspective_RADIUS = 16;
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static const double perspective_SHARPEN = 1.0;
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*/
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Uint8 perspective_r, perspective_g, perspective_b;
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int corner;
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int dash;
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int click_x, click_y;
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int new_w, new_h, old_h, sound_h;
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int perspective_average_r, perspective_average_g, perspective_average_b, perspective_average_count;
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Uint32 pixel_average, black, white;
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int otop_left_x, otop_left_y, otop_right_x, otop_right_y;
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int obottom_right_x, obottom_right_y, obottom_left_x, obottom_left_y;
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int top_left_x, top_left_y, top_right_x, top_right_y;
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int bottom_right_x, bottom_right_y, bottom_left_x, bottom_left_y;
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float top_advc_x, right_advc_x, bottom_advc_x, left_advc_x;
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float top_advc_y, right_advc_y, bottom_advc_y, left_advc_y;
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enum
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{
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TOOL_PERSPECTIVE,
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TOOL_PANELS,
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TOOL_ZOOM,
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perspective_NUM_TOOLS
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};
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enum
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{
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TOP_LEFT,
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TOP_RIGHT,
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BOTTOM_RIGHT,
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BOTTOM_LEFT
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};
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/* A copy of canvas at switchin, will be used to draw from it as snapshot changes at each click */
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static SDL_Surface *canvas_back;
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static Mix_Chunk *perspective_snd_effect[perspective_NUM_TOOLS + 1];
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const char *perspective_snd_filenames[perspective_NUM_TOOLS + 1] = {
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"perspective.ogg",
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"zoom_down.ogg", /* TODO: Could use a different sound */
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"zoom_up.ogg",
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"zoom_down.ogg",
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};
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const char *perspective_icon_filenames[perspective_NUM_TOOLS] = {
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"perspective.png",
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"panels.png",
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"zoom.png",
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};
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const char *perspective_names[perspective_NUM_TOOLS] = {
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gettext_noop("Perspective"),
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gettext_noop("Panels"),
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gettext_noop("Zoom"),
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};
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const char *perspective_descs[perspective_NUM_TOOLS] = {
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gettext_noop("Click on the corners and drag where you want to stretch the picture."),
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gettext_noop("Click to turn your picture into 2-by-2 panels."),
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gettext_noop("Click and drag up to zoom in or drag down to zoom out the picture."),
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};
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Uint32 perspective_api_version(void)
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{
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return (TP_MAGIC_API_VERSION);
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}
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//Load sounds
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int perspective_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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for (i = 0; i <= perspective_NUM_TOOLS; i++)
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{
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snprintf(fname, sizeof(fname), "%s/sounds/magic/%s", api->data_directory, perspective_snd_filenames[i]);
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perspective_snd_effect[i] = Mix_LoadWAV(fname);
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}
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return (1);
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}
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int perspective_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
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{
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return (perspective_NUM_TOOLS);
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}
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// Load our icons:
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SDL_Surface *perspective_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), "%simages/magic/%s", api->data_directory, perspective_icon_filenames[which]);
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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 *perspective_get_name(magic_api * api ATTRIBUTE_UNUSED, int which)
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{
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return (strdup(gettext_noop(perspective_names[which])));
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}
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// Return our group (the same):
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int perspective_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return MAGIC_TYPE_PICTURE_WARPS;
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}
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// Return our descriptions, localized:
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char *perspective_get_description(magic_api * api ATTRIBUTE_UNUSED, int which, int mode ATTRIBUTE_UNUSED)
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{
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return (strdup(gettext_noop(perspective_descs[which])));
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}
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// Affect the canvas on drag:
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void perspective_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * last, int ox ATTRIBUTE_UNUSED, int oy ATTRIBUTE_UNUSED, int x, int y,
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SDL_Rect * update_rect)
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{
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switch (which)
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{
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case TOOL_PERSPECTIVE:
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{
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switch (corner)
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{
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case TOP_LEFT:
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{
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top_left_x = x;
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top_left_y = y;
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}
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break;
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case TOP_RIGHT:
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{
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top_right_x = x;
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top_right_y = y;
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}
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break;
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case BOTTOM_LEFT:
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{
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bottom_left_x = x;
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bottom_left_y = y;
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}
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break;
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case BOTTOM_RIGHT:
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{
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bottom_right_x = x;
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bottom_right_y = y;
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}
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break;
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}
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SDL_BlitSurface(canvas_back, NULL, canvas, NULL);
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perspective_preview(api, which, canvas, last, x, y, update_rect, 2.0);
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/* Draw a square and the current shape relative to it as a visual reference */
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/* square */
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api->line(api, which, canvas, last, otop_left_x, otop_left_y, otop_right_x, otop_right_y, 1, perspective_line);
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api->line(api, which, canvas, last, otop_left_x, otop_left_y, obottom_left_x, obottom_left_y, 1,
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perspective_line);
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api->line(api, which, canvas, last, obottom_left_x, obottom_left_y, obottom_right_x, obottom_right_y, 1,
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perspective_line);
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api->line(api, which, canvas, last, obottom_right_x, obottom_right_y, otop_right_x, otop_right_y, 1,
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perspective_line);
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/* shape */
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api->line(api, which, canvas, last, top_left_x, top_left_y, top_right_x, top_right_y, 1, perspective_line);
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api->line(api, which, canvas, last, top_left_x, top_left_y, bottom_left_x, bottom_left_y, 1, perspective_line);
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api->line(api, which, canvas, last, bottom_left_x, bottom_left_y, bottom_right_x, bottom_right_y, 1,
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perspective_line);
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api->line(api, which, canvas, last, bottom_right_x, bottom_right_y, top_right_x, top_right_y, 1,
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perspective_line);
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api->playsound(perspective_snd_effect[which], (x * 255) / canvas->w, 255);
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}
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break;
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case TOOL_ZOOM:
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{
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int x_distance, y_distance;
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update_rect->x = update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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SDL_FillRect(canvas, update_rect, SDL_MapRGB(canvas->format, perspective_r, perspective_g, perspective_b));
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new_h = max(1, old_h + click_y - y);
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new_w = canvas->w * new_h / canvas->h;
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if (new_h >= sound_h)
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api->playsound(perspective_snd_effect[which], 127, 255);
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else
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api->playsound(perspective_snd_effect[which + 1], 127, 255);
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sound_h = new_h;
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x_distance = (otop_right_x - otop_left_x) * new_w / canvas->w;
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top_left_x = bottom_left_x = canvas->w / 2 - x_distance / 2;
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top_right_x = bottom_right_x = canvas->w / 2 + x_distance / 2;
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y_distance = (obottom_left_y - otop_left_y) * new_w / canvas->w;
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top_left_y = top_right_y = canvas->h / 2 - y_distance / 2;
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bottom_left_y = bottom_right_y = canvas->h / 2 + y_distance / 2;
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perspective_preview(api, which, canvas, last, x, y, update_rect, 2.0);
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update_rect->x = update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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}
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break;
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}
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update_rect->x = 0;
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update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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}
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// Affect the canvas on click:
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void perspective_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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switch (which)
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{
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case TOOL_PERSPECTIVE:
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{
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if (x < canvas->w / 2)
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{
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if (y < canvas->h / 2)
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{
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corner = TOP_LEFT;
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}
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else
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{
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corner = BOTTOM_LEFT;
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}
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}
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else
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{
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if (y < canvas->h / 2)
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{
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corner = TOP_RIGHT;
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}
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else
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{
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corner = BOTTOM_RIGHT;
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}
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}
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}
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break;
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case TOOL_ZOOM:
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{
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click_x = x;
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click_y = y;
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old_h = new_h;
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}
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break;
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case TOOL_PANELS:
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{
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SDL_Surface *scaled_surf;
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scaled_surf = api->scale(canvas, canvas->w / 2, canvas->h / 2, 0);
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/* Top left */
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update_rect->x = 0;
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update_rect->y = 0;
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update_rect->w = scaled_surf->w;
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update_rect->h = scaled_surf->h;
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SDL_BlitSurface(scaled_surf, NULL, canvas, update_rect);
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/* Top right */
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update_rect->x = scaled_surf->w;
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update_rect->y = 0;
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update_rect->w = scaled_surf->w;
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update_rect->h = scaled_surf->h;
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SDL_BlitSurface(scaled_surf, NULL, canvas, update_rect);
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/* Bottom left */
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update_rect->x = 0;
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update_rect->y = scaled_surf->h;
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update_rect->w = scaled_surf->w;
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update_rect->h = scaled_surf->h;
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SDL_BlitSurface(scaled_surf, NULL, canvas, update_rect);
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/* Bottom right */
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update_rect->x = scaled_surf->w;
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update_rect->y = scaled_surf->h;
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update_rect->w = scaled_surf->w;
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update_rect->h = scaled_surf->h;
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SDL_BlitSurface(scaled_surf, NULL, canvas, update_rect);
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update_rect->x = 0;
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update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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SDL_FreeSurface(scaled_surf);
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api->playsound(perspective_snd_effect[which], 127, 255);
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}
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break;
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}
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if (which != TOOL_PANELS)
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{
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perspective_drag(api, which, canvas, last, x, y, x, y, update_rect);
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}
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}
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// Affect the canvas on release:
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void perspective_release(magic_api * api, int which,
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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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switch (which)
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{
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case TOOL_PERSPECTIVE:
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{
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perspective_preview(api, which, canvas, last, x, y, update_rect, 0.5);
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}
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break;
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case TOOL_ZOOM:
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{
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SDL_Surface *aux_surf;
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SDL_Surface *scaled_surf;
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update_rect->x = update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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SDL_FillRect(canvas, update_rect, SDL_MapRGB(canvas->format, perspective_r, perspective_g, perspective_b));
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if (new_h < canvas->h)
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{
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scaled_surf = api->scale(canvas_back, new_w, new_h, 0);
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update_rect->x = (canvas->w - new_w) / 2;
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update_rect->y = (canvas->h - new_h) / 2;
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update_rect->w = new_w;
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update_rect->h = new_h;
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SDL_BlitSurface(scaled_surf, NULL, canvas, update_rect);
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}
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else
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{
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int aux_h, aux_w;
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aux_h = canvas->h * canvas->h / new_h;
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aux_w = canvas->w * aux_h / canvas->h;
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update_rect->x = canvas->w / 2 - aux_w / 2;
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update_rect->y = canvas->h / 2 - aux_h / 2;
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update_rect->w = aux_w;
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update_rect->h = aux_h;
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aux_surf = SDL_CreateRGBSurface(SDL_SWSURFACE,
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aux_w,
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aux_h,
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canvas->format->BitsPerPixel,
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canvas->format->Rmask, canvas->format->Gmask, canvas->format->Bmask, 0);
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SDL_BlitSurface(canvas_back, update_rect, aux_surf, NULL);
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scaled_surf = api->scale(aux_surf, canvas->w, canvas->h, 0);
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SDL_BlitSurface(scaled_surf, NULL, canvas, NULL);
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SDL_FreeSurface(aux_surf);
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}
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SDL_FreeSurface(scaled_surf);
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update_rect->x = update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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}
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break;
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}
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}
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void perspective_preview(magic_api * api, int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas, SDL_Surface * last ATTRIBUTE_UNUSED,
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int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED, SDL_Rect * update_rect, float step)
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{
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float i, j;
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float ax, ay, bx, by, dx, dy;
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int ox_distance, oy_distance;
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int center_ofset_x, center_ofset_y;
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update_rect->x = update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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SDL_FillRect(canvas, update_rect, SDL_MapRGB(canvas->format, perspective_r, perspective_g, perspective_b));
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ox_distance = otop_right_x - otop_left_x;
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oy_distance = obottom_left_y - otop_left_y;
|
|
|
|
top_advc_x = (float)(top_right_x - top_left_x) / ox_distance;
|
|
top_advc_y = (float)(top_right_y - top_left_y) / ox_distance;
|
|
|
|
left_advc_x = (float)(bottom_left_x - top_left_x) / oy_distance;
|
|
left_advc_y = (float)(bottom_left_y - top_left_y) / oy_distance;
|
|
|
|
|
|
right_advc_x = (float)(bottom_right_x - top_right_x) / oy_distance;
|
|
right_advc_y = (float)(bottom_right_y - top_right_y) / oy_distance;
|
|
|
|
bottom_advc_x = (float)(bottom_right_x - bottom_left_x) / ox_distance;
|
|
bottom_advc_y = (float)(bottom_right_y - bottom_left_y) / ox_distance;
|
|
|
|
center_ofset_x = (otop_left_x - top_left_x) * 2;
|
|
center_ofset_y = (otop_left_y - top_left_y) * 2;
|
|
|
|
for (i = 0; i < canvas->w; i += step)
|
|
{
|
|
ax = (float)top_advc_x *i;
|
|
ay = (float)top_advc_y *i;
|
|
bx = (float)bottom_advc_x *i + (bottom_left_x - top_left_x) * 2;
|
|
by = (float)bottom_advc_y *i + (bottom_left_y - top_left_y) * 2;
|
|
|
|
for (j = 0; j < canvas->h; j += step)
|
|
{
|
|
dx = (float)(bx - ax) / canvas->h * j;
|
|
dy = (float)(by - ay) / canvas->h * j;
|
|
|
|
api->putpixel(canvas, ax + dx - center_ofset_x, ay + dy - center_ofset_y, api->getpixel(canvas_back, i, j));
|
|
}
|
|
}
|
|
}
|
|
|
|
void perspective_shutdown(magic_api * api ATTRIBUTE_UNUSED)
|
|
{
|
|
//Clean up sounds
|
|
int i;
|
|
|
|
for (i = 0; i < perspective_NUM_TOOLS + 1; i++)
|
|
{
|
|
if (perspective_snd_effect[i] != NULL)
|
|
{
|
|
Mix_FreeChunk(perspective_snd_effect[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Record the color from Tux Paint:
|
|
void perspective_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 r, Uint8 g, Uint8 b)
|
|
{
|
|
perspective_r = r;
|
|
perspective_g = g;
|
|
perspective_b = b;
|
|
}
|
|
|
|
// Use colors:
|
|
int perspective_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which)
|
|
{
|
|
if (which == TOOL_PANELS)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
void perspective_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
|
|
SDL_Surface * canvas)
|
|
{
|
|
Uint32 amask;
|
|
|
|
new_w = canvas->w;
|
|
new_h = canvas->h;
|
|
|
|
top_left_x = otop_left_x = bottom_left_x = obottom_left_x = canvas->w / 4;
|
|
top_left_y = otop_left_y = top_right_y = otop_right_y = canvas->h / 4;
|
|
|
|
top_right_x = otop_right_x = bottom_right_x = obottom_right_x = canvas->w - otop_left_x;
|
|
|
|
bottom_left_y = obottom_left_y = bottom_right_y = obottom_right_y = canvas->h - otop_left_y;
|
|
|
|
black = SDL_MapRGBA(canvas->format, 0, 0, 0, 0);
|
|
white = SDL_MapRGBA(canvas->format, 255, 255, 255, 0);
|
|
|
|
amask = ~(canvas->format->Rmask | canvas->format->Gmask | canvas->format->Bmask);
|
|
|
|
canvas_back = SDL_CreateRGBSurface(SDL_SWSURFACE,
|
|
canvas->w,
|
|
canvas->h,
|
|
canvas->format->BitsPerPixel,
|
|
canvas->format->Rmask, canvas->format->Gmask, canvas->format->Bmask, amask);
|
|
|
|
SDL_BlitSurface(canvas, NULL, canvas_back, NULL);
|
|
}
|
|
|
|
void perspective_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
|
|
SDL_Surface * canvas ATTRIBUTE_UNUSED)
|
|
{
|
|
SDL_FreeSurface(canvas_back);
|
|
}
|
|
|
|
int perspective_modes(magic_api * api ATTRIBUTE_UNUSED, int which)
|
|
{
|
|
if (which == TOOL_PANELS) {
|
|
return (MODE_FULLSCREEN);
|
|
} else {
|
|
return (MODE_PAINT_WITH_PREVIEW);
|
|
}
|
|
}
|
|
|
|
void perspective_line(void *ptr_to_api, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas,
|
|
SDL_Surface * snapshot ATTRIBUTE_UNUSED, int x, int y)
|
|
{
|
|
magic_api *api = (magic_api *) ptr_to_api;
|
|
|
|
dash += 1;
|
|
if (dash > 8)
|
|
dash = 0;
|
|
if (dash > 3)
|
|
api->putpixel(canvas, x, y, black);
|
|
else
|
|
api->putpixel(canvas, x, y, white);
|
|
}
|