test/testcursor.c

/*
  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/
#include <stdio.h>
#include <stdlib.h>

#include "SDL.h"

/* This is an example 16x16 cursor
	top left :	black
	top right : inverted color or black
	bottom left: white
	bottom right: transparent
	(swap left and right for different endianness)
*/

Uint16 cursor_data[16] = {
    0xffff,
    0xffff,
    0xffff,
    0xffff,

    0xffff,
    0xffff,
    0xffff,
    0xffff,

    0x0000,
    0x0000,
    0x0000,
    0x0000,

    0x0000,
    0x0000,
    0x0000,
    0x0000
};

Uint16 cursor_mask[16] = {
    0xff00,
    0xff00,
    0xff00,
    0xff00,

    0xff00,
    0xff00,
    0xff00,
    0xff00,

    0xff00,
    0xff00,
    0xff00,
    0xff00,

    0xff00,
    0xff00,
    0xff00,
    0xff00
};

/* another test cursor: smaller than 16x16, and with an odd height */

Uint8 small_cursor_data[11] =
    { 0x00, 0x18, 0x08, 0x38, 0x44, 0x54, 0x44, 0x38, 0x20, 0x20, 0x00 };
Uint8 small_cursor_mask[11] =
    { 0x3C, 0x3C, 0x3C, 0x7C, 0xC6, 0xC6, 0xC6, 0x7C, 0x78, 0x70, 0x70 };

/* XPM */
static const char *arrow[] = {
    /* width height num_colors chars_per_pixel */
    "    32    32        3            1",
    /* colors */
    "X c #000000",
    ". c #ffffff",
    "  c None",
    /* pixels */
    "X                               ",
    "XX                              ",
    "X.X                             ",
    "X..X                            ",
    "X...X                           ",
    "X....X                          ",
    "X.....X                         ",
    "X......X                        ",
    "X.......X                       ",
    "X........X                      ",
    "X.....XXXXX                     ",
    "X..X..X                         ",
    "X.X X..X                        ",
    "XX  X..X                        ",
    "X    X..X                       ",
    "     X..X                       ",
    "      X..X                      ",
    "      X..X                      ",
    "       XX                       ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "                                ",
    "0,0"
};

static SDL_Cursor *
create_arrow_cursor()
{
    int i, row, col;
    Uint8 data[4 * 32];
    Uint8 mask[4 * 32];
    int hot_x, hot_y;

    i = -1;
    for (row = 0; row < 32; ++row) {
        for (col = 0; col < 32; ++col) {
            if (col % 8) {
                data[i] <<= 1;
                mask[i] <<= 1;
            } else {
                ++i;
                data[i] = mask[i] = 0;
            }
            switch (arrow[4 + row][col]) {
            case 'X':
                data[i] |= 0x01;
                mask[i] |= 0x01;
                break;
            case '.':
                mask[i] |= 0x01;
                break;
            case ' ':
                break;
            }
        }
    }
    SDL_sscanf(arrow[4 + row], "%d,%d", &hot_x, &hot_y);
    return SDL_CreateCursor(data, mask, 32, 32, hot_x, hot_y);
}

SDL_Surface *
LoadSprite(char *file)
{
    SDL_Surface *sprite;

    /* Load the sprite image */
    sprite = SDL_LoadBMP(file);
    if (sprite == NULL) {
        fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
        return NULL;
    }

    /* Set transparent pixel as the pixel at (0,0) */
    if (sprite->format->palette) {
        SDL_SetColorKey(sprite, (SDL_SRCCOLORKEY | SDL_RLEACCEL),
                        *(Uint8 *) sprite->pixels);
    }

    /* We're ready to roll. :) */
    return sprite;
}

int
main(int argc, char *argv[])
{
    SDL_Surface *screen;
    SDL_bool quit = SDL_FALSE, first_time = SDL_TRUE;
    SDL_Cursor *cursor[5];
    int current;

    /* Load the SDL library */
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return (1);
    }

    screen = SDL_SetVideoMode(640, 480, 8, SDL_ANYFORMAT);
    if (screen == NULL) {
        fprintf(stderr, "Couldn't initialize video mode: %s\n",
                SDL_GetError());
        return (1);
    }

    SDL_FillRect(screen, NULL, 0x664422);

    cursor[0] = SDL_CreateCursor((Uint8 *) cursor_data, (Uint8 *) cursor_mask,
                                 16, 16, 8, 8);
    if (cursor[0] == NULL) {
        fprintf(stderr, "Couldn't initialize test cursor: %s\n",
                SDL_GetError());
        SDL_Quit();
        return (1);
    }
    cursor[1] = create_arrow_cursor();
    if (cursor[1] == NULL) {
        fprintf(stderr, "Couldn't initialize arrow cursor: %s\n",
                SDL_GetError());
        SDL_FreeCursor(cursor[0]);
        SDL_Quit();
        return (1);
    }
    cursor[2] = SDL_CreateCursor(small_cursor_data, small_cursor_mask,
                                 8, 11, 3, 5);
    if (cursor[2] == NULL) {
        fprintf(stderr, "Couldn't initialize test cursor: %s\n",
                SDL_GetError());
        SDL_Quit();
        return (1);
    }
    cursor[3] = SDL_CreateColorCursor(LoadSprite("icon.bmp"), 0, 0);
    cursor[4] = SDL_GetCursor();

    current = SDL_arraysize(cursor)-1;
    SDL_SetCursor(cursor[current]);

    while (!quit) {
        SDL_Event event;
        while (SDL_PollEvent(&event)) {
            switch (event.type) {
            case SDL_MOUSEBUTTONDOWN:
                current = (current + 1) % SDL_arraysize(cursor);
                SDL_SetCursor(cursor[current]);
                break;
            case SDL_KEYDOWN:
                if (event.key.keysym.sym == SDLK_ESCAPE) {
                    quit = SDL_TRUE;
                }
                break;
            case SDL_QUIT:
                quit = SDL_TRUE;
                break;
            }
        }
        SDL_Flip(screen);
        SDL_Delay(1);
    }

    for (current = 0; current < SDL_arraysize(cursor); ++current) {
        SDL_FreeCursor(cursor[current]);
    }

    SDL_Quit();
    return (0);
}

/* vi: set ts=4 sw=4 expandtab: */