SDL/test/testcustomcursor.c

/*
  Copyright (C) 1997-2021 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 <stdlib.h>
#include <stdio.h>

#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif

#include "SDL_test_common.h"

/* Stolen from the mailing list */
/* Creates a new mouse cursor from an XPM */


/* 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*
init_color_cursor(const char *file)
{
    SDL_Cursor *cursor = NULL;
    SDL_Surface *surface = SDL_LoadBMP(file);
    if (surface) {
        if (surface->format->palette) {
            SDL_SetColorKey(surface, 1, *(Uint8 *) surface->pixels);
        } else {
            switch (surface->format->BitsPerPixel) {
            case 15:
                SDL_SetColorKey(surface, 1, (*(Uint16 *)surface->pixels) & 0x00007FFF);
                break;
            case 16:
                SDL_SetColorKey(surface, 1, *(Uint16 *)surface->pixels);
                break;
            case 24:
                SDL_SetColorKey(surface, 1, (*(Uint32 *)surface->pixels) & 0x00FFFFFF);
                break;
            case 32:
                SDL_SetColorKey(surface, 1, *(Uint32 *)surface->pixels);
                break;
            }
        }
        cursor = SDL_CreateColorCursor(surface, 0, 0);
        SDL_FreeSurface(surface);
    }
    return cursor;
}

static SDL_Cursor*
init_system_cursor(const char *image[])
{
  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 (image[4+row][col]) {
        case 'X':
          data[i] |= 0x01;
          mask[i] |= 0x01;
          break;
        case '.':
          mask[i] |= 0x01;
          break;
        case ' ':
          break;
      }
    }
  }
  sscanf(image[4+row], "%d,%d", &hot_x, &hot_y);
  return SDL_CreateCursor(data, mask, 32, 32, hot_x, hot_y);
}

static SDLTest_CommonState *state;
int done;
static SDL_Cursor *cursors[1+SDL_NUM_SYSTEM_CURSORS];
static int current_cursor;
static int show_cursor;

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
    SDLTest_CommonQuit(state);
    exit(rc);
}

void
loop()
{
    int i;
    SDL_Event event;
    /* Check for events */
    while (SDL_PollEvent(&event)) {
        SDLTest_CommonEvent(state, &event, &done);
        if (event.type == SDL_MOUSEBUTTONDOWN) {
            if (event.button.button == SDL_BUTTON_LEFT) {
                ++current_cursor;
                if (current_cursor == SDL_arraysize(cursors)) {
                    current_cursor = 0;
                }
                SDL_SetCursor(cursors[current_cursor]);
            } else {
                show_cursor = !show_cursor;
                SDL_ShowCursor(show_cursor);
            }
        }
    }
    
    for (i = 0; i < state->num_windows; ++i) {
        SDL_Renderer *renderer = state->renderers[i];
        SDL_RenderClear(renderer);
        SDL_RenderPresent(renderer);
    }
#ifdef __EMSCRIPTEN__
    if (done) {
        emscripten_cancel_main_loop();
    }
#endif
}

int
main(int argc, char *argv[])
{
    int i;
    const char *color_cursor = NULL;

    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    /* Initialize test framework */
    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
    if (!state) {
        return 1;
    }
    for (i = 1; i < argc;) {
        int consumed;

        consumed = SDLTest_CommonArg(state, i);
        if (consumed == 0) {
            color_cursor = argv[i];
            break;
        }
        if (consumed < 0) {
            SDLTest_CommonLogUsage(state, argv[0], NULL);
            quit(1);
        }
        i += consumed;
    }

    if (!SDLTest_CommonInit(state)) {
        quit(2);
    }

    for (i = 0; i < state->num_windows; ++i) {
        SDL_Renderer *renderer = state->renderers[i];
        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
        SDL_RenderClear(renderer);
    }

    if (color_cursor) {
        cursors[0] = init_color_cursor(color_cursor);
    } else {
        cursors[0] = init_system_cursor(arrow);
    }
    if (!cursors[0]) {
        SDL_Log("Error, couldn't create cursor\n");
        quit(2);
    }
    for (i = 0; i < SDL_NUM_SYSTEM_CURSORS; ++i) {
        cursors[1+i] = SDL_CreateSystemCursor((SDL_SystemCursor)i);
        if (!cursors[1+i]) {
            SDL_Log("Error, couldn't create system cursor %d\n", i);
            quit(2);
        }
    }
    SDL_SetCursor(cursors[0]);

    /* Main render loop */
    done = 0;
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (!done) {
        loop();
    }
#endif

    for (i = 0; i < SDL_arraysize(cursors); ++i) {
        SDL_FreeCursor(cursors[i]);
    }
    quit(0);

    /* keep the compiler happy ... */
    return(0);
}

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