202 lines
7.9 KiB
C
202 lines
7.9 KiB
C
/*
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* Copyright (c) 2019, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------------
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*
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* This file implements the LOLWUT command. The command should do something
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* fun and interesting, and should be replaced by a new implementation at
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* each new version of Redis.
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*
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* Thanks to Michele Hiki Falcone for the original image that ispired
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* the image, part of his game, Plaguemon.
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*
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* Thanks to the Shhh computer art collective for the help in tuning the
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* output to have a better artistic effect.
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*/
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#include "server.h"
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#include "lolwut.h"
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/* Render the canvas using the four gray levels of the standard color
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* terminal: they match very well to the grayscale display of the gameboy. */
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static sds renderCanvas(lwCanvas *canvas) {
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sds text = sdsempty();
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for (int y = 0; y < canvas->height; y++) {
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for (int x = 0; x < canvas->width; x++) {
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int color = lwGetPixel(canvas,x,y);
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char *ce; /* Color escape sequence. */
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/* Note that we set both the foreground and background color.
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* This way we are able to get a more consistent result among
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* different terminals implementations. */
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switch(color) {
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case 0: ce = "0;30;40m"; break; /* Black */
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case 1: ce = "0;90;100m"; break; /* Gray 1 */
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case 2: ce = "0;37;47m"; break; /* Gray 2 */
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case 3: ce = "0;97;107m"; break; /* White */
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default: ce = "0;30;40m"; break; /* Just for safety. */
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}
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text = sdscatprintf(text,"\033[%s \033[0m",ce);
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}
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if (y != canvas->height-1) text = sdscatlen(text,"\n",1);
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}
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return text;
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}
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/* Draw a skyscraper on the canvas, according to the parameters in the
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* 'skyscraper' structure. Window colors are random and are always one
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* of the two grays. */
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struct skyscraper {
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int xoff; /* X offset. */
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int width; /* Pixels width. */
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int height; /* Pixels height. */
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int windows; /* Draw windows if true. */
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int color; /* Color of the skyscraper. */
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};
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void generateSkyscraper(lwCanvas *canvas, struct skyscraper *si) {
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int starty = canvas->height-1;
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int endy = starty - si->height + 1;
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for (int y = starty; y >= endy; y--) {
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for (int x = si->xoff; x < si->xoff+si->width; x++) {
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/* The roof is four pixels less wide. */
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if (y == endy && (x <= si->xoff+1 || x >= si->xoff+si->width-2))
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continue;
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int color = si->color;
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/* Alter the color if this is a place where we want to
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* draw a window. We check that we are in the inner part of the
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* skyscraper, so that windows are far from the borders. */
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if (si->windows &&
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x > si->xoff+1 &&
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x < si->xoff+si->width-2 &&
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y > endy+1 &&
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y < starty-1)
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{
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/* Calculate the x,y position relative to the start of
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* the window area. */
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int relx = x - (si->xoff+1);
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int rely = y - (endy+1);
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/* Note that we want the windows to be two pixels wide
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* but just one pixel tall, because terminal "pixels"
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* (characters) are not square. */
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if (relx/2 % 2 && rely % 2) {
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do {
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color = 1 + rand() % 2;
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} while (color == si->color);
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/* Except we want adjacent pixels creating the same
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* window to be the same color. */
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if (relx % 2) color = lwGetPixel(canvas,x-1,y);
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}
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}
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lwDrawPixel(canvas,x,y,color);
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}
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}
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}
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/* Generate a skyline inspired by the parallax backgrounds of 8 bit games. */
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void generateSkyline(lwCanvas *canvas) {
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struct skyscraper si;
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/* First draw the background skyscraper without windows, using the
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* two different grays. We use two passes to make sure that the lighter
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* ones are always in the background. */
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for (int color = 2; color >= 1; color--) {
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si.color = color;
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for (int offset = -10; offset < canvas->width;) {
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offset += rand() % 8;
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si.xoff = offset;
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si.width = 10 + rand()%9;
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if (color == 2)
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si.height = canvas->height/2 + rand()%canvas->height/2;
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else
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si.height = canvas->height/2 + rand()%canvas->height/3;
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si.windows = 0;
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generateSkyscraper(canvas, &si);
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if (color == 2)
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offset += si.width/2;
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else
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offset += si.width+1;
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}
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}
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/* Now draw the foreground skyscraper with the windows. */
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si.color = 0;
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for (int offset = -10; offset < canvas->width;) {
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offset += rand() % 8;
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si.xoff = offset;
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si.width = 5 + rand()%14;
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if (si.width % 4) si.width += (si.width % 3);
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si.height = canvas->height/3 + rand()%canvas->height/2;
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si.windows = 1;
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generateSkyscraper(canvas, &si);
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offset += si.width+5;
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}
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}
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/* The LOLWUT 6 command:
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*
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* LOLWUT [columns] [rows]
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*
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* By default the command uses 80 columns, 40 squares per row
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* per column.
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*/
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void lolwut6Command(client *c) {
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long cols = 80;
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long rows = 20;
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/* Parse the optional arguments if any. */
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if (c->argc > 1 &&
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getLongFromObjectOrReply(c,c->argv[1],&cols,NULL) != C_OK)
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return;
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if (c->argc > 2 &&
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getLongFromObjectOrReply(c,c->argv[2],&rows,NULL) != C_OK)
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return;
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/* Limits. We want LOLWUT to be always reasonably fast and cheap to execute
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* so we have maximum number of columns, rows, and output resulution. */
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if (cols < 1) cols = 1;
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if (cols > 1000) cols = 1000;
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if (rows < 1) rows = 1;
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if (rows > 1000) rows = 1000;
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/* Generate the city skyline and reply. */
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lwCanvas *canvas = lwCreateCanvas(cols,rows,3);
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generateSkyline(canvas);
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sds rendered = renderCanvas(canvas);
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rendered = sdscat(rendered,
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"\nDedicated to the 8 bit game developers of past and present.\n"
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"Original 8 bit image from Plaguemon by hikikomori. Redis ver. ");
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rendered = sdscat(rendered,REDIS_VERSION);
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rendered = sdscatlen(rendered,"\n",1);
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addReplyVerbatim(c,rendered,sdslen(rendered),"txt");
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sdsfree(rendered);
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lwFreeCanvas(canvas);
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}
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