/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2011 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* This file contains functions for backwards compatibility with SDL 1.2 */

#include "SDL.h"

#include "SDL_syswm.h"

#include "video/SDL_sysvideo.h"

#include "video/SDL_pixels_c.h"

#include "render/SDL_yuv_sw_c.h"

static SDL_Window *SDL_VideoWindow = NULL;

static SDL_Surface *SDL_VideoSurface = NULL;

static SDL_Surface *SDL_ShadowSurface = NULL;

static SDL_Surface *SDL_PublicSurface = NULL;

static SDL_GLContext *SDL_VideoContext = NULL;

static Uint32 SDL_VideoFlags = 0;

static char *wm_title = NULL;

static SDL_Surface *SDL_VideoIcon;

static int SDL_enabled_UNICODE = 0;

const char *

SDL_AudioDriverName(char *namebuf, int maxlen)

{

    const char *name = SDL_GetCurrentAudioDriver();

    if (name) {

        if (namebuf) {

            SDL_strlcpy(namebuf, name, maxlen);

            return namebuf;

        } else {

            return name;

        }

    }

    return NULL;

}

const char *

SDL_VideoDriverName(char *namebuf, int maxlen)

{

    const char *name = SDL_GetCurrentVideoDriver();

    if (name) {

        if (namebuf) {

            SDL_strlcpy(namebuf, name, maxlen);

            return namebuf;

        } else {

            return name;

        }

    }

    return NULL;

}

static int

GetVideoDisplay()

{

    const char *variable = SDL_getenv("SDL_VIDEO_FULLSCREEN_DISPLAY");

    if ( !variable ) {

        variable = SDL_getenv("SDL_VIDEO_FULLSCREEN_HEAD");

    }

    if ( variable ) {

        return SDL_atoi(variable);

    } else {

        return 0;

    }

}

const SDL_VideoInfo *

SDL_GetVideoInfo(void)

{

    static SDL_VideoInfo info;

    SDL_DisplayMode mode;

    /* Memory leak, compatibility code, who cares? */

    if (!info.vfmt && SDL_GetDesktopDisplayMode(GetVideoDisplay(), &mode) == 0) {

        int bpp;

        Uint32 Rmask, Gmask, Bmask, Amask;

        SDL_PixelFormatEnumToMasks(mode.format, &bpp, &Rmask, &Gmask, &Bmask,

                                   &Amask);

        info.vfmt = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);

        info.current_w = mode.w;

        info.current_h = mode.h;

    }

    return &info;

}

int

SDL_VideoModeOK(int width, int height, int bpp, Uint32 flags)

{

    int i, actual_bpp = 0;

    if (!SDL_GetVideoDevice()) {

        return 0;

    }

    if (!(flags & SDL_FULLSCREEN)) {

        SDL_DisplayMode mode;

        SDL_GetDesktopDisplayMode(GetVideoDisplay(), &mode);

        return SDL_BITSPERPIXEL(mode.format);

    }

    for (i = 0; i < SDL_GetNumDisplayModes(GetVideoDisplay()); ++i) {

        SDL_DisplayMode mode;

        SDL_GetDisplayMode(GetVideoDisplay(), i, &mode);

        if (!mode.w || !mode.h || (width == mode.w && height == mode.h)) {

            if (!mode.format) {

                return bpp;

            }

            if (SDL_BITSPERPIXEL(mode.format) >= (Uint32) bpp) {

                actual_bpp = SDL_BITSPERPIXEL(mode.format);

            }

        }

    }

    return actual_bpp;

}

SDL_Rect **

SDL_ListModes(const SDL_PixelFormat * format, Uint32 flags)

{

    int i, nmodes;

    SDL_Rect **modes;

    if (!SDL_GetVideoDevice()) {

        return NULL;

    }

    if (!(flags & SDL_FULLSCREEN)) {

        return (SDL_Rect **) (-1);

    }

    if (!format) {

        format = SDL_GetVideoInfo()->vfmt;

    }

    /* Memory leak, but this is a compatibility function, who cares? */

    nmodes = 0;

    modes = NULL;

    for (i = 0; i < SDL_GetNumDisplayModes(GetVideoDisplay()); ++i) {

        SDL_DisplayMode mode;

        int bpp;

        SDL_GetDisplayMode(GetVideoDisplay(), i, &mode);

        if (!mode.w || !mode.h) {

            return (SDL_Rect **) (-1);

        }

        /* Copied from src/video/SDL_pixels.c:SDL_PixelFormatEnumToMasks */

        if (SDL_BYTESPERPIXEL(mode.format) <= 2) {

            bpp = SDL_BITSPERPIXEL(mode.format);

        } else {

            bpp = SDL_BYTESPERPIXEL(mode.format) * 8;

        }

        if (bpp != format->BitsPerPixel) {

            continue;

        }

        if (nmodes > 0 && modes[nmodes - 1]->w == mode.w

            && modes[nmodes - 1]->h == mode.h) {

            continue;

        }

        modes = SDL_realloc(modes, (nmodes + 2) * sizeof(*modes));

        if (!modes) {

            return NULL;

        }

        modes[nmodes] = (SDL_Rect *) SDL_malloc(sizeof(SDL_Rect));

        if (!modes[nmodes]) {

            return NULL;

        }

        modes[nmodes]->x = 0;

        modes[nmodes]->y = 0;

        modes[nmodes]->w = mode.w;

        modes[nmodes]->h = mode.h;

        ++nmodes;

    }

    if (modes) {

        modes[nmodes] = NULL;

    }

    return modes;

}

static int

SDL_CompatEventFilter(void *userdata, SDL_Event * event)

{

    SDL_Event fake;

    switch (event->type) {

    case SDL_WINDOWEVENT:

        switch (event->window.event) {

        case SDL_WINDOWEVENT_EXPOSED:

            if (!SDL_HasEvent(SDL_VIDEOEXPOSE)) {

                fake.type = SDL_VIDEOEXPOSE;

                SDL_PushEvent(&fake);

            }

            break;

        case SDL_WINDOWEVENT_RESIZED:

            SDL_FlushEvent(SDL_VIDEORESIZE);

            fake.type = SDL_VIDEORESIZE;

            fake.resize.w = event->window.data1;

            fake.resize.h = event->window.data2;

            SDL_PushEvent(&fake);

            break;

        case SDL_WINDOWEVENT_MINIMIZED:

            fake.type = SDL_ACTIVEEVENT;

            fake.active.gain = 0;

            fake.active.state = SDL_APPACTIVE;

            SDL_PushEvent(&fake);

            break;

        case SDL_WINDOWEVENT_RESTORED:

            fake.type = SDL_ACTIVEEVENT;

            fake.active.gain = 1;

            fake.active.state = SDL_APPACTIVE;

            SDL_PushEvent(&fake);

            break;

        case SDL_WINDOWEVENT_ENTER:

            fake.type = SDL_ACTIVEEVENT;

            fake.active.gain = 1;

            fake.active.state = SDL_APPMOUSEFOCUS;

            SDL_PushEvent(&fake);

            break;

        case SDL_WINDOWEVENT_LEAVE:

            fake.type = SDL_ACTIVEEVENT;

            fake.active.gain = 0;

            fake.active.state = SDL_APPMOUSEFOCUS;

            SDL_PushEvent(&fake);

            break;

        case SDL_WINDOWEVENT_FOCUS_GAINED:

            fake.type = SDL_ACTIVEEVENT;

            fake.active.gain = 1;

            fake.active.state = SDL_APPINPUTFOCUS;

            SDL_PushEvent(&fake);

            break;

        case SDL_WINDOWEVENT_FOCUS_LOST:

            fake.type = SDL_ACTIVEEVENT;

            fake.active.gain = 0;

            fake.active.state = SDL_APPINPUTFOCUS;

            SDL_PushEvent(&fake);

            break;

        case SDL_WINDOWEVENT_CLOSE:

            fake.type = SDL_QUIT;

            SDL_PushEvent(&fake);

            break;

        }

    case SDL_KEYDOWN:

    case SDL_KEYUP:

        {

            Uint32 unicode = 0;

            if (event->key.type == SDL_KEYDOWN && event->key.keysym.sym < 256) {

                unicode = event->key.keysym.sym;

                if (unicode >= 'a' && unicode <= 'z') {

                    int shifted = !!(event->key.keysym.mod & KMOD_SHIFT);

                    int capslock = !!(event->key.keysym.mod & KMOD_CAPS);

                    if ((shifted ^ capslock) != 0) {

                        unicode = SDL_toupper(unicode);

                    }

                }

            }

            if (unicode) {

                event->key.keysym.unicode = unicode;

            }

            break;

        }

    case SDL_TEXTINPUT:

        {

            /* FIXME: Generate an old style key repeat event if needed */

            //printf("TEXTINPUT: '%s'\n", event->text.text);

            break;

        }

    case SDL_MOUSEWHEEL:

        {

            Uint8 button;

            int x, y;

            if (event->wheel.y == 0) {

                break;

            }

            SDL_GetMouseState(&x, &y);

            if (event->wheel.y > 0) {

                button = SDL_BUTTON_WHEELUP;

            } else {

                button = SDL_BUTTON_WHEELDOWN;

            }

            fake.button.button = button;

            fake.button.x = x;

            fake.button.y = y;

            fake.button.windowID = event->wheel.windowID;

            fake.type = SDL_MOUSEBUTTONDOWN;

            fake.button.state = SDL_PRESSED;

            SDL_PushEvent(&fake);

            fake.type = SDL_MOUSEBUTTONUP;

            fake.button.state = SDL_RELEASED;

            SDL_PushEvent(&fake);

            break;

        }

    }

    return 1;

}

static void

GetEnvironmentWindowPosition(int w, int h, int *x, int *y)

{

    const char *window = SDL_getenv("SDL_VIDEO_WINDOW_POS");

    const char *center = SDL_getenv("SDL_VIDEO_CENTERED");

    if (window) {

        if (SDL_sscanf(window, "%d,%d", x, y) == 2) {

            return;

        }

        if (SDL_strcmp(window, "center") == 0) {

            center = window;

        }

    }

    if (center) {

        SDL_DisplayMode mode;

        SDL_GetDesktopDisplayMode(GetVideoDisplay(), &mode);

        *x = (mode.w - w) / 2;

        *y = (mode.h - h) / 2;

    }

}

static void

ClearVideoSurface()

{

    Uint32 black;

    /* Clear the surface for display */

    black = SDL_MapRGB(SDL_PublicSurface->format, 0, 0, 0);

    SDL_FillRect(SDL_PublicSurface, NULL, black);

    SDL_UpdateRect(SDL_PublicSurface, 0, 0, 0, 0);

}

static void

SetupScreenSaver(int flags)

{

    const char *env;

    SDL_bool allow_screensaver;

    /* Allow environment override of screensaver disable */

    env = SDL_getenv("SDL_VIDEO_ALLOW_SCREENSAVER");

    if (env) {

        allow_screensaver = SDL_atoi(env) ? SDL_TRUE : SDL_FALSE;

    } else if (flags & SDL_FULLSCREEN) {

        allow_screensaver = SDL_FALSE;

    } else {

        allow_screensaver = SDL_TRUE;

    }

    if (allow_screensaver) {

        SDL_EnableScreenSaver();

    } else {

        SDL_DisableScreenSaver();

    }

}

static int

SDL_ResizeVideoMode(int width, int height, int bpp, Uint32 flags)

{

    int w, h;

    /* We can't resize something we don't have... */

    if (!SDL_VideoWindow) {

        return -1;

    }

    /* We probably have to recreate the window in fullscreen mode */

    if (flags & SDL_FULLSCREEN) {

        return -1;

    }

    /* I don't think there's any change we can gracefully make in flags */

    if (flags != SDL_VideoFlags) {

        return -1;

    }

    /* Resize the window */

    SDL_GetWindowSize(SDL_VideoWindow, &w, &h);

    if (w != width || h != height) {

        SDL_SetWindowSize(SDL_VideoWindow, width, height);

    }

    /* If we're in OpenGL mode, just resize the stub surface and we're done! */

    if (flags & SDL_OPENGL) {

        SDL_VideoSurface->w = width;

        SDL_VideoSurface->h = height;

        return 0;

    }

    /* Destroy the screen texture and recreate it */

    SDL_VideoSurface = SDL_GetWindowSurface(SDL_VideoWindow);

    if (!SDL_VideoSurface) {

        return -1;

    }

    if (SDL_ShadowSurface) {

        SDL_ShadowSurface->w = width;

        SDL_ShadowSurface->h = height;

        SDL_ShadowSurface->pitch = SDL_CalculatePitch(SDL_ShadowSurface);

        SDL_ShadowSurface->pixels =

            SDL_realloc(SDL_ShadowSurface->pixels,

                        SDL_ShadowSurface->h * SDL_ShadowSurface->pitch);

        SDL_SetClipRect(SDL_ShadowSurface, NULL);

        SDL_InvalidateMap(SDL_ShadowSurface->map);

    } else {

        SDL_PublicSurface = SDL_VideoSurface;

    }

    ClearVideoSurface();

    return 0;

}

SDL_Surface *

SDL_SetVideoMode(int width, int height, int bpp, Uint32 flags)

{

    SDL_DisplayMode desktop_mode;

    int window_x = SDL_WINDOWPOS_UNDEFINED;

    int window_y = SDL_WINDOWPOS_UNDEFINED;

    Uint32 window_flags;

    Uint32 surface_flags;

    if (!SDL_GetVideoDevice()) {

        if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE) < 0) {

            return NULL;

        }

    }

    SDL_GetDesktopDisplayMode(GetVideoDisplay(), &desktop_mode);

    if (width == 0) {

        width = desktop_mode.w;

    }

    if (height == 0) {

        height = desktop_mode.h;

    }

    if (bpp == 0) {

        bpp = SDL_BITSPERPIXEL(desktop_mode.format);

    }

    /* See if we can simply resize the existing window and surface */

    if (SDL_ResizeVideoMode(width, height, bpp, flags) == 0) {

        return SDL_PublicSurface;

    }

    /* Destroy existing window */

    SDL_PublicSurface = NULL;

    if (SDL_ShadowSurface) {

        SDL_FreeSurface(SDL_ShadowSurface);

        SDL_ShadowSurface = NULL;

    }

    if (SDL_VideoSurface) {

        SDL_FreeSurface(SDL_VideoSurface);

        SDL_VideoSurface = NULL;

    }

    if (SDL_VideoContext) {

        /* SDL_GL_MakeCurrent(0, NULL); *//* Doesn't do anything */

        SDL_GL_DeleteContext(SDL_VideoContext);

        SDL_VideoContext = NULL;

    }

    if (SDL_VideoWindow) {

        SDL_GetWindowPosition(SDL_VideoWindow, &window_x, &window_y);

        SDL_DestroyWindow(SDL_VideoWindow);

    }

    /* Set up the event filter */

    if (!SDL_GetEventFilter(NULL, NULL)) {

        SDL_SetEventFilter(SDL_CompatEventFilter, NULL);

    }

    /* Create a new window */

    window_flags = SDL_WINDOW_SHOWN;

    if (flags & SDL_FULLSCREEN) {

        window_flags |= SDL_WINDOW_FULLSCREEN;

    }

    if (flags & SDL_OPENGL) {

        window_flags |= SDL_WINDOW_OPENGL;

    }

    if (flags & SDL_RESIZABLE) {

        window_flags |= SDL_WINDOW_RESIZABLE;

    }

    if (flags & SDL_NOFRAME) {

        window_flags |= SDL_WINDOW_BORDERLESS;