/*

  Simple DirectMedia Layer

  Copyright (C) 1997-2012 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, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not

     claim that you wrote the original software. If you use this software

     in a product, an acknowledgment in the product documentation would be

     appreciated but is not required.

  2. Altered source versions must be plainly marked as such, and must not be

     misrepresented as being the original software.

  3. This notice may not be removed or altered from any source distribution.

*/

#include "SDL_config.h"

#if SDL_VIDEO_DRIVER_X11

#include <X11/cursorfont.h>

#include "SDL_assert.h"

#include "SDL_x11video.h"

#include "SDL_x11mouse.h"

#include "SDL_x11xinput2.h"

#include "../../events/SDL_mouse_c.h"

/* FIXME: Find a better place to put this... */

static Cursor x11_empty_cursor = None;

static Display *

GetDisplay(void)

{

    return ((SDL_VideoData *)SDL_GetVideoDevice()->driverdata)->display;

}

static Cursor

X11_CreateEmptyCursor()

{

    if (x11_empty_cursor == None) {

        Display *display = GetDisplay();

        char data[1];

        XColor color;

        Pixmap pixmap;

        SDL_zero(data);

        color.red = color.green = color.blue = 0;

        pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),

                                       data, 1, 1);

        if (pixmap) {

            x11_empty_cursor = XCreatePixmapCursor(display, pixmap, pixmap,

                                                   &color, &color, 0, 0);

            XFreePixmap(display, pixmap);

        }

    }

    return x11_empty_cursor;

}

static void

X11_DestroyEmptyCursor(void)

{

    if (x11_empty_cursor != None) {

        XFreeCursor(GetDisplay(), x11_empty_cursor);

        x11_empty_cursor = None;

    }

}

static SDL_Cursor *

X11_CreateDefaultCursor()

{

    SDL_Cursor *cursor;

    cursor = SDL_calloc(1, sizeof(*cursor));

    if (cursor) {

        /* None is used to indicate the default cursor */

        cursor->driverdata = (void*)None;

    } else {

        SDL_OutOfMemory();

    }

    return cursor;

}

#if SDL_VIDEO_DRIVER_X11_XCURSOR

static Cursor

X11_CreateXCursorCursor(SDL_Surface * surface, int hot_x, int hot_y)

{

    Display *display = GetDisplay();

    Cursor cursor = None;

    XcursorImage *image;

    image = XcursorImageCreate(surface->w, surface->h);

    if (!image) {

        SDL_OutOfMemory();

        return None;

    }

    image->xhot = hot_x;

    image->yhot = hot_y;

    image->delay = 0;

    SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);

    SDL_assert(surface->pitch == surface->w * 4);

    SDL_memcpy(image->pixels, surface->pixels, surface->h * surface->pitch);

    cursor = XcursorImageLoadCursor(display, image);

    XcursorImageDestroy(image);

    return cursor;

}

#endif /* SDL_VIDEO_DRIVER_X11_XCURSOR */

static Cursor

X11_CreatePixmapCursor(SDL_Surface * surface, int hot_x, int hot_y)

{

    Display *display = GetDisplay();

    XColor fg, bg;

    Cursor cursor = None;

    Uint32 *ptr;

    Uint8 *data_bits, *mask_bits;

    Pixmap data_pixmap, mask_pixmap;

    int x, y;

    unsigned int rfg, gfg, bfg, rbg, gbg, bbg, fgBits, bgBits;

    unsigned int width_bytes = ((surface->w + 7) & ~7) / 8;

    data_bits = SDL_calloc(1, surface->h * width_bytes);

    mask_bits = SDL_calloc(1, surface->h * width_bytes);

    if (!data_bits || !mask_bits) {

        SDL_OutOfMemory();

        return None;

    }

    /* Code below assumes ARGB pixel format */

    SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);

    rfg = gfg = bfg = rbg = gbg = bbg = fgBits = bgBits = 0;

    for (y = 0; y < surface->h; ++y) {

        ptr = (Uint32 *)((Uint8 *)surface->pixels + y * surface->pitch);

        for (x = 0; x < surface->w; ++x) {

            int alpha = (*ptr >> 24) & 0xff;

            int red   = (*ptr >> 16) & 0xff;

            int green = (*ptr >> 8) & 0xff;

            int blue  = (*ptr >> 0) & 0xff;

            if (alpha > 25) {

                mask_bits[y * width_bytes + x / 8] |= (0x01 << (x % 8));

                if ((red + green + blue) > 0x40) {

                    fgBits++;

                    rfg += red;

                    gfg += green;

                    bfg += blue;

                    data_bits[y * width_bytes + x / 8] |= (0x01 << (x % 8));

                } else {

                    bgBits++;

                    rbg += red;

                    gbg += green;

                    bbg += blue;

                }

            }

            ++ptr;

        }

    }

    if (fgBits) {

        fg.red   = rfg * 257 / fgBits;

        fg.green = gfg * 257 / fgBits;

        fg.blue  = bfg * 257 / fgBits;

    }

    else fg.red = fg.green = fg.blue = 0;

    if (bgBits) {

        bg.red   = rbg * 257 / bgBits;

        bg.green = gbg * 257 / bgBits;

        bg.blue  = bbg * 257 / bgBits;

    }

    else bg.red = bg.green = bg.blue = 0;

    data_pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),

                                        (char*)data_bits,

                                        surface->w, surface->h);

    mask_pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),

                                        (char*)mask_bits,

                                        surface->w, surface->h);

    cursor = XCreatePixmapCursor(display, data_pixmap, mask_pixmap,

                                 &fg, &bg, hot_x, hot_y);

	XFreePixmap(display, data_pixmap);

	XFreePixmap(display, mask_pixmap);

    return cursor;

}

static SDL_Cursor *

X11_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)

{

    SDL_Cursor *cursor;

    cursor = SDL_calloc(1, sizeof(*cursor));

    if (cursor) {

        Cursor x11_cursor = None;

#if SDL_VIDEO_DRIVER_X11_XCURSOR

        if (SDL_X11_HAVE_XCURSOR) {

            x11_cursor = X11_CreateXCursorCursor(surface, hot_x, hot_y);

        }

#endif

        if (x11_cursor == None) {

            x11_cursor = X11_CreatePixmapCursor(surface, hot_x, hot_y);

        }

        cursor->driverdata = (void*)x11_cursor;

    } else {

        SDL_OutOfMemory();

    }

    return cursor;

}

static SDL_Cursor *

X11_CreateSystemCursor(SDL_SystemCursor id)

{

    SDL_Cursor *cursor;

    unsigned int shape;

    switch(id)

    {

    default:

        SDL_assert(0);

        return NULL;

    case SDL_SYSTEM_CURSOR_IBEAM:     shape = XC_xterm; break;

    case SDL_SYSTEM_CURSOR_WAIT:      shape = XC_watch; break;

    case SDL_SYSTEM_CURSOR_CROSSHAIR: shape = XC_tcross; break;

    case SDL_SYSTEM_CURSOR_WAITARROW: shape = XC_watch; break;

    case SDL_SYSTEM_CURSOR_SIZENWSE:  shape = XC_fleur; break;

    case SDL_SYSTEM_CURSOR_SIZENESW:  shape = XC_fleur; break;

    case SDL_SYSTEM_CURSOR_SIZEWE:    shape = XC_sb_h_double_arrow; break;

    case SDL_SYSTEM_CURSOR_SIZENS:    shape = XC_sb_v_double_arrow; break;

    case SDL_SYSTEM_CURSOR_SIZEALL:   shape = XC_fleur; break;

    case SDL_SYSTEM_CURSOR_NO:        shape = XC_pirate; break;

    case SDL_SYSTEM_CURSOR_HAND:      shape = XC_hand2; break;

    }

    cursor = SDL_calloc(1, sizeof(*cursor));

    if (cursor) {

        Cursor x11_cursor;

        x11_cursor = XCreateFontCursor(GetDisplay(), shape);

        cursor->driverdata = (void*)x11_cursor;

    } else {

        SDL_OutOfMemory();

    }

    return cursor;

}

static void

X11_FreeCursor(SDL_Cursor * cursor)

{

    Cursor x11_cursor = (Cursor)cursor->driverdata;

    if (x11_cursor != None) {

        XFreeCursor(GetDisplay(), x11_cursor);

    }

    SDL_free(cursor);

}

static int

X11_ShowCursor(SDL_Cursor * cursor)

{

    Cursor x11_cursor = 0;

    if (cursor) {

        x11_cursor = (Cursor)cursor->driverdata;

    } else {

        x11_cursor = X11_CreateEmptyCursor();

    }

    /* FIXME: Is there a better way than this? */

    {

        SDL_VideoDevice *video = SDL_GetVideoDevice();

        Display *display = GetDisplay();

        SDL_Window *window;

        SDL_WindowData *data;

        for (window = video->windows; window; window = window->next) {

            data = (SDL_WindowData *)window->driverdata;

            if (x11_cursor != None) {

                XDefineCursor(display, data->xwindow, x11_cursor);

            } else {

                XUndefineCursor(display, data->xwindow);

            }

        }

        XFlush(display);

    }

    return 0;

}

static void

X11_WarpMouse(SDL_Window * window, int x, int y)

{

    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;

    Display *display = data->videodata->display;

    XWarpPointer(display, None, data->xwindow, 0, 0, 0, 0, x, y);

    XSync(display, False);

}

static int

X11_SetRelativeMouseMode(SDL_bool enabled)

{

#if SDL_VIDEO_DRIVER_X11_XINPUT2

    if(X11_Xinput2IsInitialized())

        return 0;

#else

    SDL_Unsupported();

#endif

    return -1;

}

void

X11_InitMouse(_THIS)

{

    SDL_Mouse *mouse = SDL_GetMouse();

    mouse->CreateCursor = X11_CreateCursor;

	mouse->CreateSystemCursor = X11_CreateSystemCursor;

    mouse->ShowCursor = X11_ShowCursor;

    mouse->FreeCursor = X11_FreeCursor;

    mouse->WarpMouse = X11_WarpMouse;

    mouse->SetRelativeMouseMode = X11_SetRelativeMouseMode;

    SDL_SetDefaultCursor(X11_CreateDefaultCursor());

}

void

X11_QuitMouse(_THIS)

{

    X11_DestroyEmptyCursor();

}

#endif /* SDL_VIDEO_DRIVER_X11 */

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