src/SDL_compat.c

/*
  Simple DirectMedia Layer
  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, 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"

/* 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_WindowSurface = 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 SDL_Rect SDL_VideoViewport;
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) {
        info.vfmt = SDL_AllocFormat(mode.format);
        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);
            /* We don't want to expose that the window width and height will
               be different if we don't get the desired fullscreen mode.
            */
            if (SDL_VideoWindow && !(SDL_GetWindowFlags(SDL_VideoWindow) & SDL_WINDOW_FULLSCREEN)) {
                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_MOUSEMOTION:
        {
            event->motion.x -= SDL_VideoViewport.x;
            event->motion.y -= SDL_VideoViewport.y;
            break;
        }
    case SDL_MOUSEBUTTONDOWN:
    case SDL_MOUSEBUTTONUP:
        {
            event->button.x -= SDL_VideoViewport.x;
            event->button.y -= SDL_VideoViewport.y;
            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)
{
    int display = GetVideoDisplay();
    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) {
        *x = SDL_WINDOWPOS_CENTERED_DISPLAY(display);
        *y = SDL_WINDOWPOS_CENTERED_DISPLAY(display);
    }
}

static void
ClearVideoSurface()
{
    if (SDL_ShadowSurface) {
        SDL_FillRect(SDL_ShadowSurface, NULL,
            SDL_MapRGB(SDL_ShadowSurface->format, 0, 0, 0));
    }
    SDL_FillRect(SDL_WindowSurface, NULL, 0);
    SDL_UpdateWindowSurface(SDL_VideoWindow);
}

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_VideoSurface) {
        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;
    }
    if (bpp != SDL_VideoSurface->format->BitsPerPixel) {
        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;
    }

    SDL_WindowSurface = SDL_GetWindowSurface(SDL_VideoWindow);
    if (!SDL_WindowSurface) {
        return -1;
    }
    if (SDL_VideoSurface->format != SDL_WindowSurface->format) {
        return -1;
    }
    SDL_VideoSurface->w = width;
    SDL_VideoSurface->h = height;
    SDL_VideoSurface->pixels = SDL_WindowSurface->pixels;
    SDL_VideoSurface->pitch = SDL_WindowSurface->pitch;
    SDL_SetClipRect(SDL_VideoSurface, NULL);

    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 display = GetVideoDisplay();
    int window_x = SDL_WINDOWPOS_UNDEFINED_DISPLAY(display);
    int window_y = SDL_WINDOWPOS_UNDEFINED_DISPLAY(display);
    int window_w;
    int window_h;
    Uint32 window_flags;
    Uint32 surface_flags;

    if (!SDL_GetVideoDevice()) {
        if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE) < 0) {
            return NULL;
        }
    }

    SDL_GetDesktopDisplayMode(display, &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_ShadowSurface->flags &= ~SDL_DONTFREE;
        SDL_FreeSurface(SDL_ShadowSurface);
        SDL_ShadowSurface = NULL;
    }
    if (SDL_VideoSurface) {
        SDL_VideoSurface->flags &= ~SDL_DONTFREE;
        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;
    }
    GetEnvironmentWindowPosition(width, height, &window_x, &window_y);
    SDL_VideoWindow =
        SDL_CreateWindow(wm_title, window_x, window_y, width, height,
                         window_flags);
    if (!SDL_VideoWindow) {
        return NULL;
    }
    SDL_SetWindowIcon(SDL_VideoWindow, SDL_VideoIcon);

    SetupScreenSaver(flags);

    window_flags = SDL_GetWindowFlags(SDL_VideoWindow);
    surface_flags = 0;
    if (window_flags & SDL_WINDOW_FULLSCREEN) {
        surface_flags |= SDL_FULLSCREEN;
    }
    if ((window_flags & SDL_WINDOW_OPENGL) && (flags & SDL_OPENGL)) {
        surface_flags |= SDL_OPENGL;
    }
    if (window_flags & SDL_WINDOW_RESIZABLE) {
        surface_flags |= SDL_RESIZABLE;
    }
    if (window_flags & SDL_WINDOW_BORDERLESS) {
        surface_flags |= SDL_NOFRAME;
    }

    SDL_VideoFlags = flags;

    /* If we're in OpenGL mode, just create a stub surface and we're done! */
    if (flags & SDL_OPENGL) {
        SDL_VideoContext = SDL_GL_CreateContext(SDL_VideoWindow);
        if (!SDL_VideoContext) {
            return NULL;
        }
        if (SDL_GL_MakeCurrent(SDL_VideoWindow, SDL_VideoContext) < 0) {
            return NULL;
        }
        SDL_VideoSurface =
            SDL_CreateRGBSurfaceFrom(NULL, width, height, bpp, 0, 0, 0, 0, 0);
        if (!SDL_VideoSurface) {
            return NULL;
        }
        SDL_VideoSurface->flags |= surface_flags;
        SDL_PublicSurface = SDL_VideoSurface;
        return SDL_PublicSurface;
    }

    /* Create the screen surface */
    SDL_WindowSurface = SDL_GetWindowSurface(SDL_VideoWindow);
    if (!SDL_WindowSurface) {
        return NULL;
    }

    /* Center the public surface in the window surface */
    SDL_GetWindowSize(SDL_VideoWindow, &window_w, &window_h);
    SDL_VideoViewport.x = (window_w - width)/2;
    SDL_VideoViewport.y = (window_h - height)/2;
    SDL_VideoViewport.w = width;
    SDL_VideoViewport.h = height;

    SDL_VideoSurface = SDL_CreateRGBSurfaceFrom(NULL, 0, 0, 32, 0, 0, 0, 0, 0);
    SDL_VideoSurface->flags |= surface_flags;
    SDL_VideoSurface->flags |= SDL_DONTFREE;
    SDL_FreeFormat(SDL_VideoSurface->format);
    SDL_VideoSurface->format = SDL_WindowSurface->format;
    SDL_VideoSurface->format->refcount++;
    SDL_VideoSurface->w = width;
    SDL_VideoSurface->h = height;
    SDL_VideoSurface->pitch = SDL_WindowSurface->pitch;
    SDL_VideoSurface->pixels = (void *)((Uint8 *)SDL_WindowSurface->pixels +
        SDL_VideoViewport.y * SDL_VideoSurface->pitch +
        SDL_VideoViewport.x  * SDL_VideoSurface->format->BytesPerPixel);
    SDL_SetClipRect(SDL_VideoSurface, NULL);

    /* Create a shadow surface if necessary */
    if ((bpp != SDL_VideoSurface->format->BitsPerPixel)
        && !(flags & SDL_ANYFORMAT)) {
        SDL_ShadowSurface =
            SDL_CreateRGBSurface(0, width, height, bpp, 0, 0, 0, 0);
        if (!SDL_ShadowSurface) {
            return NULL;
        }
        SDL_ShadowSurface->flags |= surface_flags;
        SDL_ShadowSurface->flags |= SDL_DONTFREE;

        /* 8-bit SDL_ShadowSurface surfaces report that they have exclusive palette */
        if (SDL_ShadowSurface->format->palette) {
            SDL_ShadowSurface->flags |= SDL_HWPALETTE;
            SDL_DitherColors(SDL_ShadowSurface->format->palette->colors,
                             SDL_ShadowSurface->format->BitsPerPixel);
        }
        SDL_FillRect(SDL_ShadowSurface, NULL,
            SDL_MapRGB(SDL_ShadowSurface->format, 0, 0, 0));
    }
    SDL_PublicSurface =
        (SDL_ShadowSurface ? SDL_ShadowSurface : SDL_VideoSurface);

    ClearVideoSurface();

    /* We're finally done! */
    return SDL_PublicSurface;
}

SDL_Surface *
SDL_GetVideoSurface(void)
{
    return SDL_PublicSurface;
}

int
SDL_SetAlpha(SDL_Surface * surface, Uint32 flag, Uint8 value)
{
    if (flag & SDL_SRCALPHA) {
        /* According to the docs, value is ignored for alpha surfaces */
        if (surface->format->Amask) {
            value = 0xFF;
        }
        SDL_SetSurfaceAlphaMod(surface, value);
        SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
    } else {
        SDL_SetSurfaceAlphaMod(surface, 0xFF);
        SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE);
    }
    SDL_SetSurfaceRLE(surface, (flag & SDL_RLEACCEL));

    return 0;
}

SDL_Surface *
SDL_DisplayFormat(SDL_Surface * surface)
{
    SDL_PixelFormat *format;

    if (!SDL_PublicSurface) {
        SDL_SetError("No video mode has been set");
        return NULL;
    }
    format = SDL_PublicSurface->format;

    /* Set the flags appropriate for copying to display surface */
    return SDL_ConvertSurface(surface, format, SDL_RLEACCEL);
}

SDL_Surface *
SDL_DisplayFormatAlpha(SDL_Surface * surface)
{
    SDL_PixelFormat *vf;
    SDL_PixelFormat *format;
    SDL_Surface *converted;
    /* default to ARGB8888 */
    Uint32 amask = 0xff000000;
    Uint32 rmask = 0x00ff0000;
    Uint32 gmask = 0x0000ff00;
    Uint32 bmask = 0x000000ff;

    if (!SDL_PublicSurface) {
        SDL_SetError("No video mode has been set");
        return NULL;
    }
    vf = SDL_PublicSurface->format;

    switch (vf->BytesPerPixel) {
    case 2:
        /* For XGY5[56]5, use, AXGY8888, where {X, Y} = {R, B}.
           For anything else (like ARGB4444) it doesn't matter
           since we have no special code for it anyway */
        if ((vf->Rmask == 0x1f) &&
            (vf->Bmask == 0xf800 || vf->Bmask == 0x7c00)) {
            rmask = 0xff;
            bmask = 0xff0000;
        }
        break;

    case 3:
    case 4:
        /* Keep the video format, as long as the high 8 bits are
           unused or alpha */
        if ((vf->Rmask == 0xff) && (vf->Bmask == 0xff0000)) {
            rmask = 0xff;
            bmask = 0xff0000;
        }
        break;

    default:
        /* We have no other optimised formats right now. When/if a new
           optimised alpha format is written, add the converter here */
        break;
    }
    format = SDL_AllocFormat(SDL_MasksToPixelFormatEnum(32, rmask,
                                                            gmask,
                                                            bmask,
                                                            amask));
    if (!format) {
        return NULL;
    }
    converted = SDL_ConvertSurface(surface, format, SDL_RLEACCEL);
    SDL_FreeFormat(format);
    return converted;
}

int
SDL_Flip(SDL_Surface * screen)
{
    SDL_UpdateRect(screen, 0, 0, 0, 0);
    return 0;
}

void
SDL_UpdateRect(SDL_Surface * screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h)
{
    if (screen) {
        SDL_Rect rect;

        /* Fill the rectangle */
        rect.x = (int) x;
        rect.y = (int) y;
        rect.w = (int) (w ? w : screen->w);
        rect.h = (int) (h ? h : screen->h);
        SDL_UpdateRects(screen, 1, &rect);
    }
}

void
SDL_UpdateRects(SDL_Surface * screen, int numrects, SDL_Rect * rects)
{
    int i;

    if (screen == SDL_ShadowSurface) {
        for (i = 0; i < numrects; ++i) {
            SDL_BlitSurface(SDL_ShadowSurface, &rects[i], SDL_VideoSurface,
                            &rects[i]);
        }

        /* Fall through to video surface update */
        screen = SDL_VideoSurface;
    }
    if (screen == SDL_VideoSurface) {
        if (SDL_VideoViewport.x || SDL_VideoViewport.y) {
            SDL_Rect *stackrects = SDL_stack_alloc(SDL_Rect, numrects);
            SDL_Rect *stackrect;
            const SDL_Rect *rect;
            
            /* Offset all the rectangles before updating */
            for (i = 0; i < numrects; ++i) {
                rect = &rects[i];
                stackrect = &stackrects[i];
                stackrect->x = SDL_VideoViewport.x + rect->x;
                stackrect->y = SDL_VideoViewport.y + rect->y;
                stackrect->w = rect->w;
                stackrect->h = rect->h;
            }
            SDL_UpdateWindowSurfaceRects(SDL_VideoWindow, stackrects, numrects);
            SDL_stack_free(stackrects);
        } else {
            SDL_UpdateWindowSurfaceRects(SDL_VideoWindow, rects, numrects);
        }
    }
}

void
SDL_WM_SetCaption(const char *title, const char *icon)
{
    if (wm_title) {
        SDL_free(wm_title);
    }
    if (title) {
        wm_title = SDL_strdup(title);
    } else {
        wm_title = NULL;
    }
    SDL_SetWindowTitle(SDL_VideoWindow, wm_title);
}

void
SDL_WM_GetCaption(const char **title, const char **icon)
{
    if (title) {
        *title = wm_title;
    }
    if (icon) {
        *icon = "";
    }
}

void
SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
{
    SDL_VideoIcon = icon;
}

int
SDL_WM_IconifyWindow(void)
{
    SDL_MinimizeWindow(SDL_VideoWindow);
    return 0;
}

int
SDL_WM_ToggleFullScreen(SDL_Surface * surface)
{
    int length;
    void *pixels;
    Uint8 *src, *dst;
    int row;
    int window_w;
    int window_h;

    if (!SDL_PublicSurface) {
        SDL_SetError("SDL_SetVideoMode() hasn't been called");
        return 0;
    }

    /* Copy the old bits out */
    length = SDL_PublicSurface->w * SDL_PublicSurface->format->BytesPerPixel;
    pixels = SDL_malloc(SDL_PublicSurface->h * length);
    if (pixels) {
        src = (Uint8*)SDL_PublicSurface->pixels;
        dst = (Uint8*)pixels;
        for (row = 0; row < SDL_PublicSurface->h; ++row) {
            SDL_memcpy(dst, src, length);
            src += SDL_PublicSurface->pitch;
            dst += length;
        }
    }

    /* Do the physical mode switch */
    if (SDL_GetWindowFlags(SDL_VideoWindow) & SDL_WINDOW_FULLSCREEN) {
        if (SDL_SetWindowFullscreen(SDL_VideoWindow, 0) < 0) {
            return 0;
        }
        SDL_PublicSurface->flags &= ~SDL_FULLSCREEN;
    } else {
        if (SDL_SetWindowFullscreen(SDL_VideoWindow, 1) < 0) {
            return 0;
        }
        SDL_PublicSurface->flags |= SDL_FULLSCREEN;
    }

    /* Recreate the screen surface */
    SDL_WindowSurface = SDL_GetWindowSurface(SDL_VideoWindow);
    if (!SDL_WindowSurface) {
        /* We're totally hosed... */
        return 0;
    }

    /* Center the public surface in the window surface */
    SDL_GetWindowSize(SDL_VideoWindow, &window_w, &window_h);
    SDL_VideoViewport.x = (window_w - SDL_VideoSurface->w)/2;
    SDL_VideoViewport.y = (window_h - SDL_VideoSurface->h)/2;
    SDL_VideoViewport.w = SDL_VideoSurface->w;
    SDL_VideoViewport.h = SDL_VideoSurface->h;

    /* Do some shuffling behind the application's back if format changes */
    if (SDL_VideoSurface->format->format != SDL_WindowSurface->format->format) {
        if (SDL_ShadowSurface) {
            if (SDL_ShadowSurface->format->format == SDL_WindowSurface->format->format) {
                /* Whee!  We don't need a shadow surface anymore! */
                SDL_VideoSurface->flags &= ~SDL_DONTFREE;
                SDL_FreeSurface(SDL_VideoSurface);
                SDL_free(SDL_ShadowSurface->pixels);
                SDL_VideoSurface = SDL_ShadowSurface;
                SDL_VideoSurface->flags |= SDL_PREALLOC;
                SDL_ShadowSurface = NULL;
            } else {
                /* No problem, just change the video surface format */
                SDL_FreeFormat(SDL_VideoSurface->format);
                SDL_VideoSurface->format = SDL_WindowSurface->format;
                SDL_VideoSurface->format->refcount++;
                SDL_InvalidateMap(SDL_ShadowSurface->map);
            }
        } else {
            /* We can make the video surface the shadow surface */
            SDL_ShadowSurface = SDL_VideoSurface;
            SDL_ShadowSurface->pitch = SDL_CalculatePitch(SDL_ShadowSurface);
            SDL_ShadowSurface->pixels = SDL_malloc(SDL_ShadowSurface->h * SDL_ShadowSurface->pitch);
            if (!SDL_ShadowSurface->pixels) {
                /* Uh oh, we're hosed */
                SDL_ShadowSurface = NULL;
                return 0;
            }
            SDL_ShadowSurface->flags &= ~SDL_PREALLOC;

            SDL_VideoSurface = SDL_CreateRGBSurfaceFrom(NULL, 0, 0, 32, 0, 0, 0, 0, 0);
            SDL_VideoSurface->flags = SDL_ShadowSurface->flags;
            SDL_VideoSurface->flags |= SDL_PREALLOC;
            SDL_FreeFormat(SDL_VideoSurface->format);
            SDL_VideoSurface->format = SDL_WindowSurface->format;
            SDL_VideoSurface->format->refcount++;
            SDL_VideoSurface->w = SDL_ShadowSurface->w;
            SDL_VideoSurface->h = SDL_ShadowSurface->h;
        }
    }

    /* Update the video surface */
    SDL_VideoSurface->pitch = SDL_WindowSurface->pitch;
    SDL_VideoSurface->pixels = (void *)((Uint8 *)SDL_WindowSurface->pixels +
        SDL_VideoViewport.y * SDL_VideoSurface->pitch +
        SDL_VideoViewport.x  * SDL_VideoSurface->format->BytesPerPixel);
    SDL_SetClipRect(SDL_VideoSurface, NULL);

    /* Copy the old bits back */
    if (pixels) {
        src = (Uint8*)pixels;
        dst = (Uint8*)SDL_PublicSurface->pixels;
        for (row = 0; row < SDL_PublicSurface->h; ++row) {
            SDL_memcpy(dst, src, length);
            src += length;
            dst += SDL_PublicSurface->pitch;
        }
        SDL_Flip(SDL_PublicSurface);
        SDL_free(pixels);
    }

    /* We're done! */
    return 1;
}

SDL_GrabMode
SDL_WM_GrabInput(SDL_GrabMode mode)
{
    if (mode != SDL_GRAB_QUERY) {
        SDL_SetWindowGrab(SDL_VideoWindow, mode);
    }
    return (SDL_GrabMode) SDL_GetWindowGrab(SDL_VideoWindow);
}

void
SDL_WarpMouse(Uint16 x, Uint16 y)
{
    SDL_WarpMouseInWindow(SDL_VideoWindow, x, y);
}

Uint8
SDL_GetAppState(void)
{
    Uint8 state = 0;
    Uint32 flags = 0;

    flags = SDL_GetWindowFlags(SDL_VideoWindow);
    if ((flags & SDL_WINDOW_SHOWN) && !(flags & SDL_WINDOW_MINIMIZED)) {
        state |= SDL_APPACTIVE;
    }
    if (flags & SDL_WINDOW_INPUT_FOCUS) {
        state |= SDL_APPINPUTFOCUS;
    }
    if (flags & SDL_WINDOW_MOUSE_FOCUS) {
        state |= SDL_APPMOUSEFOCUS;
    }
    return state;
}

const SDL_version *
SDL_Linked_Version(void)
{
    static SDL_version version;
    SDL_VERSION(&version);
    return &version;
}

int
SDL_SetPalette(SDL_Surface * surface, int flags, const SDL_Color * colors,
               int firstcolor, int ncolors)
{
    return SDL_SetColors(surface, colors, firstcolor, ncolors);
}

int
SDL_SetColors(SDL_Surface * surface, const SDL_Color * colors, int firstcolor,
              int ncolors)
{
    if (SDL_SetPaletteColors
        (surface->format->palette, colors, firstcolor, ncolors) == 0) {
        return 1;
    } else {
        return 0;
    }
}

int
SDL_GetWMInfo(SDL_SysWMinfo * info)
{
    return SDL_GetWindowWMInfo(SDL_VideoWindow, info);
}

#if 0
void
SDL_MoveCursor(int x, int y)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice();

    /* Erase and update the current mouse position */
    if (SHOULD_DRAWCURSOR(SDL_cursorstate)) {
        /* Erase and redraw mouse cursor in new position */
        SDL_LockCursor();
        SDL_EraseCursor(SDL_VideoSurface);
        SDL_cursor->area.x = (x - SDL_cursor->hot_x);
        SDL_cursor->area.y = (y - SDL_cursor->hot_y);
        SDL_DrawCursor(SDL_VideoSurface);
        SDL_UnlockCursor();
    } else if (_this->MoveWMCursor) {
        _this->MoveWMCursor(_this, x, y);
    }
}

/* Keep track of the current cursor colors */
static int palette_changed = 1;
static Uint8 pixels8[2];

void
SDL_CursorPaletteChanged(void)
{
    palette_changed = 1;
}

void
SDL_MouseRect(SDL_Rect * area)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice();
    int clip_diff;

    *area = SDL_cursor->area;
    if (area->x < 0) {
        area->w += area->x;
        area->x = 0;
    }
    if (area->y < 0) {
        area->h += area->y;
        area->y = 0;
    }
    clip_diff = (area->x + area->w) - SDL_VideoSurface->w;
    if (clip_diff > 0) {
        area->w = area->w < clip_diff ? 0 : area->w - clip_diff;
    }
    clip_diff = (area->y + area->h) - SDL_VideoSurface->h;
    if (clip_diff > 0) {
        area->h = area->h < clip_diff ? 0 : area->h - clip_diff;
    }
}

static void
SDL_DrawCursorFast(SDL_Surface * screen, SDL_Rect * area)
{
    const Uint32 pixels[2] = { 0xFFFFFFFF, 0x00000000 };
    int i, w, h;
    Uint8 *data, datab;
    Uint8 *mask, maskb;

    data = SDL_cursor->data + area->y * SDL_cursor->area.w / 8;
    mask = SDL_cursor->mask + area->y * SDL_cursor->area.w / 8;
    switch (screen->format->BytesPerPixel) {

    case 1:
        {
            Uint8 *dst;
            int dstskip;

            if (palette_changed) {
                pixels8[0] =
                    (Uint8) SDL_MapRGB(screen->format, 255, 255, 255);
                pixels8[1] = (Uint8) SDL_MapRGB(screen->format, 0, 0, 0);
                palette_changed = 0;
            }
            dst = (Uint8 *) screen->pixels +
                (SDL_cursor->area.y + area->y) * screen->pitch +
                SDL_cursor->area.x;
            dstskip = screen->pitch - area->w;

            for (h = area->h; h; h--) {
                for (w = area->w / 8; w; w--) {
                    maskb = *mask++;
                    datab = *data++;
                    for (i = 0; i < 8; ++i) {
                        if (maskb & 0x80) {
                            *dst = pixels8[datab >> 7];
                        }
                        maskb <<= 1;
                        datab <<= 1;
                        dst++;
                    }
                }
                dst += dstskip;
            }
        }
        break;

    case 2:
        {
            Uint16 *dst;
            int dstskip;

            dst = (Uint16 *) screen->pixels +
                (SDL_cursor->area.y + area->y) * screen->pitch / 2 +
                SDL_cursor->area.x;
            dstskip = (screen->pitch / 2) - area->w;

            for (h = area->h; h; h--) {
                for (w = area->w / 8; w; w--) {
                    maskb = *mask++;
                    datab = *data++;
                    for (i = 0; i < 8; ++i) {
                        if (maskb & 0x80) {
                            *dst = (Uint16) pixels[datab >> 7];
                        }
                        maskb <<= 1;
                        datab <<= 1;
                        dst++;
                    }
                }
                dst += dstskip;
            }
        }
        break;

    case 3:
        {
            Uint8 *dst;
            int dstskip;

            dst = (Uint8 *) screen->pixels +
                (SDL_cursor->area.y + area->y) * screen->pitch +
                SDL_cursor->area.x * 3;
            dstskip = screen->pitch - area->w * 3;

            for (h = area->h; h; h--) {
                for (w = area->w / 8; w; w--) {
                    maskb = *mask++;
                    datab = *data++;
                    for (i = 0; i < 8; ++i) {
                        if (maskb & 0x80) {
                            SDL_memset(dst, pixels[datab >> 7], 3);
                        }
                        maskb <<= 1;
                        datab <<= 1;
                        dst += 3;
                    }
                }
                dst += dstskip;
            }
        }
        break;

    case 4:
        {
            Uint32 *dst;
            int dstskip;

            dst = (Uint32 *) screen->pixels +
                (SDL_cursor->area.y + area->y) * screen->pitch / 4 +
                SDL_cursor->area.x;
            dstskip = (screen->pitch / 4) - area->w;

            for (h = area->h; h; h--) {
                for (w = area->w / 8; w; w--) {
                    maskb = *mask++;
                    datab = *data++;
                    for (i = 0; i < 8; ++i) {
                        if (maskb & 0x80) {
                            *dst = pixels[datab >> 7];
                        }
                        maskb <<= 1;
                        datab <<= 1;
                        dst++;
                    }
                }
                dst += dstskip;
            }
        }
        break;
    }
}

static void
SDL_DrawCursorSlow(SDL_Surface * screen, SDL_Rect * area)
{
    const Uint32 pixels[2] = { 0xFFFFFF, 0x000000 };
    int h;
    int x, minx, maxx;
    Uint8 *data, datab = 0;
    Uint8 *mask, maskb = 0;
    Uint8 *dst;
    int dstbpp, dstskip;

    data = SDL_cursor->data + area->y * SDL_cursor->area.w / 8;
    mask = SDL_cursor->mask + area->y * SDL_cursor->area.w / 8;
    dstbpp = screen->format->BytesPerPixel;
    dst = (Uint8 *) screen->pixels +
        (SDL_cursor->area.y + area->y) * screen->pitch +
        SDL_cursor->area.x * dstbpp;
    dstskip = screen->pitch - SDL_cursor->area.w * dstbpp;

    minx = area->x;
    maxx = area->x + area->w;
    if (screen->format->BytesPerPixel == 1) {
        if (palette_changed) {
            pixels8[0] = (Uint8) SDL_MapRGB(screen->format, 255, 255, 255);
            pixels8[1] = (Uint8) SDL_MapRGB(screen->format, 0, 0, 0);
            palette_changed = 0;
        }
        for (h = area->h; h; h--) {
            for (x = 0; x < SDL_cursor->area.w; ++x) {
                if ((x % 8) == 0) {
                    maskb = *mask++;
                    datab = *data++;
                }
                if ((x >= minx) && (x < maxx)) {
                    if (maskb & 0x80) {
                        SDL_memset(dst, pixels8[datab >> 7], dstbpp);
                    }
                }
                maskb <<= 1;
                datab <<= 1;
                dst += dstbpp;
            }
            dst += dstskip;
        }
    } else {
        for (h = area->h; h; h--) {
            for (x = 0; x < SDL_cursor->area.w; ++x) {
                if ((x % 8) == 0) {
                    maskb = *mask++;
                    datab = *data++;
                }
                if ((x >= minx) && (x < maxx)) {
                    if (maskb & 0x80) {
                        SDL_memset(dst, pixels[datab >> 7], dstbpp);
                    }
                }
                maskb <<= 1;
                datab <<= 1;
                dst += dstbpp;
            }
            dst += dstskip;
        }
    }
}

/* This handles the ugly work of converting the saved cursor background from
   the pixel format of the shadow surface to that of the video surface.
   This is only necessary when blitting from a shadow surface of a different
   pixel format than the video surface, and using a software rendered cursor.
*/
static void
SDL_ConvertCursorSave(SDL_Surface * screen, int w, int h)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice();
    SDL_BlitInfo info;
    SDL_loblit RunBlit;

    /* Make sure we can steal the blit mapping */
    if (screen->map->dst != SDL_VideoSurface) {
        return;
    }

    /* Set up the blit information */
    info.s_pixels = SDL_cursor->save[1];
    info.s_width = w;
    info.s_height = h;
    info.s_skip = 0;
    info.d_pixels = SDL_cursor->save[0];
    info.d_width = w;
    info.d_height = h;
    info.d_skip = 0;
    info.aux_data = screen->map->sw_data->aux_data;
    info.src = screen->format;
    info.table = screen->map->table;
    info.dst = SDL_VideoSurface->format;
    RunBlit = screen->map->sw_data->blit;

    /* Run the actual software blit */
    RunBlit(&info);
}

void
SDL_DrawCursorNoLock(SDL_Surface * screen)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice();
    SDL_Rect area;

    /* Get the mouse rectangle, clipped to the screen */
    SDL_MouseRect(&area);
    if ((area.w == 0) || (area.h == 0)) {
        return;
    }

    /* Copy mouse background */
    {
        int w, h, screenbpp;
        Uint8 *src, *dst;

        /* Set up the copy pointers */
        screenbpp = screen->format->BytesPerPixel;
        if ((screen == SDL_VideoSurface) ||
            FORMAT_EQUAL(screen->format, SDL_VideoSurface->format)) {
            dst = SDL_cursor->save[0];
        } else {
            dst = SDL_cursor->save[1];
        }
        src = (Uint8 *) screen->pixels + area.y * screen->pitch +
            area.x * screenbpp;

        /* Perform the copy */
        w = area.w * screenbpp;
        h = area.h;
        while (h--) {
            SDL_memcpy(dst, src, w);
            dst += w;
            src += screen->pitch;
        }
    }

    /* Draw the mouse cursor */
    area.x -= SDL_cursor->area.x;
    area.y -= SDL_cursor->area.y;
    if ((area.x == 0) && (area.w == SDL_cursor->area.w)) {
        SDL_DrawCursorFast(screen, &area);
    } else {
        SDL_DrawCursorSlow(screen, &area);
    }
}

void
SDL_DrawCursor(SDL_Surface * screen)
{
    /* Lock the screen if necessary */
    if (screen == NULL) {
        return;
    }
    if (SDL_MUSTLOCK(screen)) {
        if (SDL_LockSurface(screen) < 0) {
            return;
        }
    }

    SDL_DrawCursorNoLock(screen);

    /* Unlock the screen and update if necessary */
    if (SDL_MUSTLOCK(screen)) {
        SDL_UnlockSurface(screen);
    }
    if (screen->flags & SDL_SCREEN_SURFACE) {
        SDL_VideoDevice *_this = SDL_GetVideoDevice();
        SDL_Window *window;
        SDL_Rect area;

        window = SDL_GetWindowFromSurface(screen);
        if (!window) {
            return;
        }

        SDL_MouseRect(&area);

        if (_this->UpdateWindowSurface) {
            _this->UpdateWindowSurface(_this, window, 1, &area);
        }
    }
}

void
SDL_EraseCursorNoLock(SDL_Surface * screen)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice();
    SDL_Window *window;
    SDL_Rect area;

    /* Get the window associated with the surface */
    window = SDL_GetWindowFromSurface(screen);
    if (!window || !window->surface) {
        return;
    }

    /* Get the mouse rectangle, clipped to the screen */
    SDL_MouseRect(&area);
    if ((area.w == 0) || (area.h == 0)) {
        return;
    }

    /* Copy mouse background */
    {
        int w, h, screenbpp;
        Uint8 *src, *dst;

        /* Set up the copy pointers */
        screenbpp = screen->format->BytesPerPixel;
        if ((screen->flags & SDL_SCREEN_SURFACE) ||
            FORMAT_EQUAL(screen->format, window->surface->format)) {
            src = SDL_cursor->save[0];
        } else {
            src = SDL_cursor->save[1];
        }
        dst = (Uint8 *) screen->pixels + area.y * screen->pitch +
            area.x * screenbpp;

        /* Perform the copy */
        w = area.w * screenbpp;
        h = area.h;
        while (h--) {
            SDL_memcpy(dst, src, w);
            src += w;
            dst += screen->pitch;
        }

        /* Perform pixel conversion on cursor background */
        if (src > SDL_cursor->save[1]) {
            SDL_ConvertCursorSave(screen, area.w, area.h);
        }
    }
}

void
SDL_EraseCursor(SDL_Surface * screen)
{
    /* Lock the screen if necessary */
    if (screen == NULL) {
        return;
    }
    if (SDL_MUSTLOCK(screen)) {
        if (SDL_LockSurface(screen) < 0) {
            return;
        }
    }

    SDL_EraseCursorNoLock(screen);

    /* Unlock the screen and update if necessary */
    if (SDL_MUSTLOCK(screen)) {
        SDL_UnlockSurface(screen);
    }
    if (screen->flags & SDL_SCREEN_SURFACE) {
        SDL_VideoDevice *_this = SDL_GetVideoDevice();
        SDL_Window *window;
        SDL_Rect area;

        window = SDL_GetWindowFromSurface(screen);
        if (!window) {
            return;
        }

        SDL_MouseRect(&area);

        if (_this->UpdateWindowSurface) {
            _this->UpdateWindowSurface(_this, window, 1, &area);
        }
    }
}

/* Reset the cursor on video mode change
   FIXME:  Keep track of all cursors, and reset them all.
 */
void
SDL_ResetCursor(void)
{
    int savelen;

    if (SDL_cursor) {
        savelen = SDL_cursor->area.w * 4 * SDL_cursor->area.h;
        SDL_cursor->area.x = 0;
        SDL_cursor->area.y = 0;
        SDL_memset(SDL_cursor->save[0], 0, savelen);
    }
}
#endif

struct private_yuvhwdata
{
    SDL_SW_YUVTexture *texture;
    SDL_Surface *display;
    Uint32 display_format;
};

SDL_Overlay *
SDL_CreateYUVOverlay(int w, int h, Uint32 format, SDL_Surface * display)
{
    SDL_Overlay *overlay;
    Uint32 texture_format;
    SDL_SW_YUVTexture *texture;

    if ((display->flags & SDL_OPENGL) == SDL_OPENGL) {
        SDL_SetError("YUV overlays are not supported in OpenGL mode");
        return NULL;
    }

    if (display != SDL_PublicSurface) {
        SDL_SetError("YUV display is only supported on the screen surface");
        return NULL;
    }

    switch (format) {
    case SDL_YV12_OVERLAY:
        texture_format = SDL_PIXELFORMAT_YV12;
        break;
    case SDL_IYUV_OVERLAY:
        texture_format = SDL_PIXELFORMAT_IYUV;
        break;
    case SDL_YUY2_OVERLAY:
        texture_format = SDL_PIXELFORMAT_YUY2;
        break;
    case SDL_UYVY_OVERLAY:
        texture_format = SDL_PIXELFORMAT_UYVY;
        break;
    case SDL_YVYU_OVERLAY:
        texture_format = SDL_PIXELFORMAT_YVYU;
        break;
    default:
        SDL_SetError("Unknown YUV format");
        return NULL;
    }

    overlay = (SDL_Overlay *) SDL_malloc(sizeof(*overlay));
    if (!overlay) {
        SDL_OutOfMemory();
        return NULL;
    }
    SDL_zerop(overlay);

    overlay->hwdata =
        (struct private_yuvhwdata *) SDL_malloc(sizeof(*overlay->hwdata));
    if (!overlay->hwdata) {
        SDL_free(overlay);
        SDL_OutOfMemory();
        return NULL;
    }

    texture = SDL_SW_CreateYUVTexture(texture_format, w, h);
    if (!texture) {
        SDL_free(overlay->hwdata);
        SDL_free(overlay);
        return NULL;
    }
    overlay->hwdata->texture = texture;
    overlay->hwdata->display = NULL;
    overlay->hwdata->display_format = SDL_PIXELFORMAT_UNKNOWN;

    overlay->format = format;
    overlay->w = w;
    overlay->h = h;
    if (format == SDL_YV12_OVERLAY || format == SDL_IYUV_OVERLAY) {
        overlay->planes = 3;
    } else {
        overlay->planes = 1;
    }
    overlay->pitches = texture->pitches;
    overlay->pixels = texture->planes;

    return overlay;
}

int
SDL_LockYUVOverlay(SDL_Overlay * overlay)
{
    SDL_Rect rect;
    void *pixels;
    int pitch;

    if (!overlay) {
        SDL_SetError("Passed a NULL overlay");
        return -1;
    }

    rect.x = 0;
    rect.y = 0;
    rect.w = overlay->w;
    rect.h = overlay->h;

    if (SDL_SW_LockYUVTexture(overlay->hwdata->texture, &rect, &pixels, &pitch) < 0) {
        return -1;
    }

    overlay->pixels[0] = (Uint8 *) pixels;
    overlay->pitches[0] = pitch;
    switch (overlay->format) {
    case SDL_YV12_OVERLAY:
    case SDL_IYUV_OVERLAY:
        overlay->pitches[1] = pitch / 2;
        overlay->pitches[2] = pitch / 2;
        overlay->pixels[1] =
            overlay->pixels[0] + overlay->pitches[0] * overlay->h;
        overlay->pixels[2] =
            overlay->pixels[1] + overlay->pitches[1] * overlay->h / 2;
        break;
    case SDL_YUY2_OVERLAY:
    case SDL_UYVY_OVERLAY:
    case SDL_YVYU_OVERLAY:
        break;
    }
    return 0;
}

void
SDL_UnlockYUVOverlay(SDL_Overlay * overlay)
{
    if (!overlay) {
        return;
    }

    SDL_SW_UnlockYUVTexture(overlay->hwdata->texture);
}

int
SDL_DisplayYUVOverlay(SDL_Overlay * overlay, SDL_Rect * dstrect)
{
    SDL_Surface *display;
    SDL_Rect src_rect;
    SDL_Rect dst_rect;
    void *pixels;

    if (!overlay || !dstrect) {
        SDL_SetError("Passed a NULL overlay or dstrect");
        return -1;
    }

    display = overlay->hwdata->display;
    if (display != SDL_VideoSurface) {
        overlay->hwdata->display = display = SDL_VideoSurface;
        overlay->hwdata->display_format = SDL_MasksToPixelFormatEnum(
                                                display->format->BitsPerPixel,
                                                display->format->Rmask,
                                                display->format->Gmask,
                                                display->format->Bmask,
                                                display->format->Amask);
    }

    src_rect.x = 0;
    src_rect.y = 0;
    src_rect.w = overlay->w;
    src_rect.h = overlay->h;

    if (!SDL_IntersectRect(&display->clip_rect, dstrect, &dst_rect)) {
        return 0;
    }
     
    pixels = (void *)((Uint8 *)display->pixels +
                        dst_rect.y * display->pitch +
                        dst_rect.x * display->format->BytesPerPixel);

    if (SDL_SW_CopyYUVToRGB(overlay->hwdata->texture, &src_rect,
                            overlay->hwdata->display_format,
                            dst_rect.w, dst_rect.h,
                            pixels, display->pitch) < 0) {
        return -1;
    }
    SDL_UpdateWindowSurface(SDL_VideoWindow);
    return 0;
}

void
SDL_FreeYUVOverlay(SDL_Overlay * overlay)
{
    if (!overlay) {
        return;
    }
    if (overlay->hwdata) {
        if (overlay->hwdata->texture) {
            SDL_SW_DestroyYUVTexture(overlay->hwdata->texture);
        }
        SDL_free(overlay->hwdata);
    }
    SDL_free(overlay);
}

void
SDL_GL_SwapBuffers(void)
{
    SDL_GL_SwapWindow(SDL_VideoWindow);
}

int
SDL_SetGamma(float red, float green, float blue)
{
    Uint16 red_ramp[256];
    Uint16 green_ramp[256];
    Uint16 blue_ramp[256];

    SDL_CalculateGammaRamp(red, red_ramp);
    if (green == red) {
        SDL_memcpy(green_ramp, red_ramp, sizeof(red_ramp));
    } else {
        SDL_CalculateGammaRamp(green, green_ramp);
    }
    if (blue == red) {
        SDL_memcpy(blue_ramp, red_ramp, sizeof(red_ramp));
    } else {
        SDL_CalculateGammaRamp(blue, blue_ramp);
    }
    return SDL_SetWindowGammaRamp(SDL_VideoWindow, red_ramp, green_ramp, blue_ramp);
}

int
SDL_SetGammaRamp(const Uint16 * red, const Uint16 * green, const Uint16 * blue)
{
    return SDL_SetWindowGammaRamp(SDL_VideoWindow, red, green, blue);
}

int
SDL_GetGammaRamp(Uint16 * red, Uint16 * green, Uint16 * blue)
{
    return SDL_GetWindowGammaRamp(SDL_VideoWindow, red, green, blue);
}

int
SDL_EnableKeyRepeat(int delay, int interval)
{
    return 0;
}

void
SDL_GetKeyRepeat(int *delay, int *interval)
{
    if (delay) {
        *delay = SDL_DEFAULT_REPEAT_DELAY;
    }
    if (interval) {
        *interval = SDL_DEFAULT_REPEAT_INTERVAL;
    }
}

int
SDL_EnableUNICODE(int enable)
{
    int previous = SDL_enabled_UNICODE;

    switch (enable) {
    case 1:
        SDL_enabled_UNICODE = 1;
        SDL_StartTextInput();
        break;
    case 0:
        SDL_enabled_UNICODE = 0;
        SDL_StopTextInput();
        break;
    }
    return previous;
}

static Uint32
SDL_SetTimerCallback(Uint32 interval, void* param)
{
    return ((SDL_OldTimerCallback)param)(interval);
}

int
SDL_SetTimer(Uint32 interval, SDL_OldTimerCallback callback)
{
    static SDL_TimerID compat_timer;

    if (compat_timer) {
        SDL_RemoveTimer(compat_timer);
        compat_timer = 0;
    }

    if (interval && callback) {
        compat_timer = SDL_AddTimer(interval, SDL_SetTimerCallback, callback);
        if (!compat_timer) {
            return -1;
        }
    }
    return 0;
}

int
SDL_putenv(const char *_var)
{
    char *ptr = NULL;
    char *var = SDL_strdup(_var);
    if (var == NULL) {
        return -1;  /* we don't set errno. */
    }

    ptr = SDL_strchr(var, '=');
    if (ptr == NULL) {
        SDL_free(var);
        return -1;
    }

    *ptr = '\0';  /* split the string into name and value. */
    SDL_setenv(var, ptr + 1, 1);
    SDL_free(var);
    return 0;
}

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