/*
  pygame - Python Game Library
  Copyright (C) 2000-2001  Pete Shinners
  Copyright (C) 2006 Rene Dudfield

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 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
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  Pete Shinners
  pete@shinners.org
*/

/*
 *  extended image module for pygame, note this only has
 *  the extended load and save functions, which are autmatically used
 *  by the normal pygame.image module if it is available.
 */
#include "pygame.h"

/* Keep a stray macro from conflicting with python.h */
#if defined(HAVE_PROTOTYPES)
#undef HAVE_PROTOTYPES
#endif
/* Remove GCC macro redefine warnings. */
#if defined(HAVE_STDDEF_H) /* also defined in pygame.h (python.h) */
#undef HAVE_STDDEF_H
#endif
#if defined(HAVE_STDLIB_H) /* also defined in pygame.h (SDL.h) */
#undef HAVE_STDLIB_H
#endif

#ifdef __SYMBIAN32__ /* until PNG support is done for Symbian */
#include <stdio.h>
#else
// PNG_SKIP_SETJMP_CHECK : non-regression on #662 (build error on old libpng)
#define PNG_SKIP_SETJMP_CHECK
#include <png.h>
#endif

#include <jerror.h>
#include <jpeglib.h>

#include "pgcompat.h"

#include "doc/image_doc.h"

#include "pgopengl.h"

#include <SDL_image.h>
#ifdef WIN32
#define strcasecmp _stricmp
#else
#include <strings.h>
#endif

#define JPEG_QUALITY 85

#ifdef WITH_THREAD
static SDL_mutex *_pg_img_mutex = 0;
#endif /* WITH_THREAD */

static const char *
find_extension(const char *fullname)
{
    const char *dot;

    if (fullname == NULL) {
        return NULL;
    }

    dot = strrchr(fullname, '.');
    if (dot == NULL) {
        return fullname;
    }
    return dot + 1;
}

static PyObject *
image_load_ext(PyObject *self, PyObject *arg)
{
    PyObject *obj;
    PyObject *final;
    PyObject *oencoded;
    PyObject *oname;
    size_t namelen;
    const char *name = NULL;
    const char *cext;
    char *ext = NULL;
    SDL_Surface *surf;
    SDL_RWops *rw;

    if (!PyArg_ParseTuple(arg, "O|s", &obj, &name)) {
        return NULL;
    }

    oencoded = pg_EncodeString(obj, "UTF-8", NULL, pgExc_SDLError);
    if (oencoded == NULL) {
        return NULL;
    }
    if (oencoded != Py_None) {
        name = Bytes_AS_STRING(oencoded);
#ifdef WITH_THREAD
        namelen = Bytes_GET_SIZE(oencoded);
        Py_BEGIN_ALLOW_THREADS;
        if (namelen > 4 && !strcasecmp(name + namelen - 4, ".gif")) {
            /* using multiple threads does not work for (at least) SDL_image <= 2.0.4 */
            SDL_LockMutex(_pg_img_mutex);
            surf = IMG_Load(name);
            SDL_UnlockMutex(_pg_img_mutex);
        }
        else {
            surf = IMG_Load(name);
        }
        Py_END_ALLOW_THREADS;
#else /* ~WITH_THREAD */
        surf = IMG_Load(name);
#endif /* WITH_THREAD */
        Py_DECREF(oencoded);
    }
    else {
#ifdef WITH_THREAD
        int lock_mutex = 0;
#endif /* WITH_THREAD */
        Py_DECREF(oencoded);
        oencoded = NULL;
#if PY2
        if (name == NULL && PyFile_Check(obj)) {
            oencoded = PyFile_Name(obj);
            if (oencoded == NULL) {
                /* This should never happen */
                return NULL;
            }
            Py_INCREF(oencoded);
            name = Bytes_AS_STRING(oencoded);
        }
#endif
        if (name == NULL) {
            oname = PyObject_GetAttrString(obj, "name");
            if (oname != NULL) {
                oencoded = pg_EncodeString(oname, "UTF-8", NULL, NULL);
                Py_DECREF(oname);
                if (oencoded == NULL) {
                    return NULL;
                }
                if (oencoded != Py_None) {
                    name = Bytes_AS_STRING(oencoded);
                }
            }
            else {
                PyErr_Clear();
            }
        }
        rw = pgRWops_FromFileObject(obj);
        if (rw == NULL) {
            Py_XDECREF(oencoded);
            return NULL;
        }

        cext = find_extension(name);
        if (cext != NULL) {
            ext = (char *)PyMem_Malloc(strlen(cext) + 1);
            if (ext == NULL) {
                Py_XDECREF(oencoded);
                return PyErr_NoMemory();
            }
            strcpy(ext, cext);
#ifdef WITH_THREAD
            lock_mutex = !strcasecmp(ext, "gif");
#endif /* WITH_THREAD */
        }
        Py_XDECREF(oencoded);
#ifdef WITH_THREAD
        Py_BEGIN_ALLOW_THREADS;
        if (lock_mutex) {
            /* using multiple threads does not work for (at least) SDL_image <= 2.0.4 */
            SDL_LockMutex(_pg_img_mutex);
            surf = IMG_LoadTyped_RW(rw, 1, ext);
            SDL_UnlockMutex(_pg_img_mutex);
        }
        else {
            surf = IMG_LoadTyped_RW(rw, 1, ext);
        }
        Py_END_ALLOW_THREADS;
#else /* ~WITH_THREAD */
        surf = IMG_LoadTyped_RW(rw, 1, ext);
#endif /* ~WITH_THREAD */
        PyMem_Free(ext);
    }

    if (surf == NULL) {
        return RAISE(pgExc_SDLError, IMG_GetError());
    }
    final = pgSurface_New(surf);
    if (final == NULL) {
        SDL_FreeSurface(surf);
    }
    return final;
}

#ifdef PNG_H

static void
png_write_fn(png_structp png_ptr, png_bytep data, png_size_t length)
{
    SDL_RWops *rwops = (SDL_RWops *)png_get_io_ptr(png_ptr);
    if (SDL_RWwrite(rwops, data, 1, length) != length) {
        SDL_RWclose(rwops);
        png_error(png_ptr, "Error while writing to the PNG file (SDL_RWwrite)");
    }
}

static void
png_flush_fn(png_structp png_ptr)
{
    /* TODO: add SDL_RWflush() when it exists */
}

static int
write_png(const char *file_name, png_bytep *rows, int w, int h, int colortype,
          int bitdepth)
{
    png_structp png_ptr = NULL;
    png_infop info_ptr = NULL;
    SDL_RWops *rwops;
    char *doing;

    if (!(rwops = SDL_RWFromFile(file_name, "wb"))) {
        return -1;
    }

    doing = "create png write struct";
    if (!(png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL,
                                            NULL)))
        goto fail;

    doing = "create png info struct";
    if (!(info_ptr = png_create_info_struct(png_ptr)))
        goto fail;
    if (setjmp(png_jmpbuf(png_ptr)))
        goto fail;

    doing = "init IO";
    png_set_write_fn(png_ptr, rwops, png_write_fn, png_flush_fn);

    doing = "write header";
    png_set_IHDR(png_ptr, info_ptr, w, h, bitdepth, colortype,
                 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
                 PNG_FILTER_TYPE_BASE);

    doing = "write info";
    png_write_info(png_ptr, info_ptr);

    doing = "write image";
    png_write_image(png_ptr, rows);

    doing = "write end";
    png_write_end(png_ptr, NULL);

    doing = "closing file";
    if (0 != SDL_RWclose(rwops))
        goto fail;
    png_destroy_write_struct(&png_ptr, &info_ptr);
    return 0;

fail:
    /*
     * I don't see how to handle the case where png_ptr
     * was allocated but info_ptr was not. However, those
     * calls should only fail if memory is out and you are
     * probably screwed regardless then. The resulting memory
     * leak is the least of your concerns.
     */
    if (png_ptr && info_ptr) {
        png_destroy_write_struct(&png_ptr, &info_ptr);
    }
    SDL_SetError("SavePNG: could not %s", doing);
    return -1;
}

static int
SavePNG(SDL_Surface *surface, const char *file)
{
    static unsigned char **ss_rows;
    static int ss_size;
    static int ss_w, ss_h;
    SDL_Surface *ss_surface;
    SDL_Rect ss_rect;
    int r, i;
    int alpha = 0;

#if IS_SDLv1
    unsigned surf_flags;
    unsigned surf_alpha;
    unsigned surf_colorkey;
#else  /* IS_SDLv2 */
    Uint8 surf_alpha = 255;
    Uint32 surf_colorkey;
    int has_colorkey = 0;
    SDL_BlendMode surf_mode;
#endif /* IS_SDLv2 */

    ss_rows = 0;
    ss_size = 0;
    ss_surface = NULL;

    ss_w = surface->w;
    ss_h = surface->h;

#if IS_SDLv1
    if (surface->format->Amask) {
        alpha = 1;
        ss_surface =
            SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_SRCALPHA, ss_w, ss_h, 32,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
                                 0xff000000, 0xff0000, 0xff00, 0xff
#else
                                 0xff, 0xff00, 0xff0000, 0xff000000
#endif
            );
    }
    else {
        ss_surface = SDL_CreateRGBSurface(SDL_SWSURFACE, ss_w, ss_h, 24,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
                                          0xff0000, 0xff00, 0xff, 0
#else
                                          0xff, 0xff00, 0xff0000, 0
#endif
        );
    }
#else /* IS_SDLv2 */
    if (surface->format->Amask) {
        alpha = 1;
        ss_surface = SDL_CreateRGBSurface(0, ss_w, ss_h, 32,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
                                          0xff000000, 0xff0000, 0xff00, 0xff
#else
                                          0xff, 0xff00, 0xff0000, 0xff000000
#endif
        );
    }
    else {
        ss_surface = SDL_CreateRGBSurface(0, ss_w, ss_h, 24,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
                                          0xff0000, 0xff00, 0xff, 0
#else
                                          0xff, 0xff00, 0xff0000, 0
#endif
        );
    }
#endif /* IS_SDLv2 */

    if (ss_surface == NULL)
        return -1;

#if IS_SDLv1
    surf_flags = surface->flags & (SDL_SRCALPHA | SDL_SRCCOLORKEY);
    surf_alpha = surface->format->alpha;
    surf_colorkey = surface->format->colorkey;

    if (surf_flags & SDL_SRCALPHA)
        SDL_SetAlpha(surface, 0, 255);
    if (surf_flags & SDL_SRCCOLORKEY)
        SDL_SetColorKey(surface, 0, surface->format->colorkey);
#else /* IS_SDLv2 */
    SDL_GetSurfaceAlphaMod(surface, &surf_alpha);
    SDL_SetSurfaceAlphaMod(surface, 255);
    SDL_GetSurfaceBlendMode(surface, &surf_mode);
    SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE);

    if (SDL_GetColorKey(surface, &surf_colorkey) == 0) {
        has_colorkey = 1;
        SDL_SetColorKey(surface, SDL_FALSE, surf_colorkey);
    }
#endif /* IS_SDLv2 */

    ss_rect.x = 0;
    ss_rect.y = 0;
    ss_rect.w = ss_w;
    ss_rect.h = ss_h;
    SDL_BlitSurface(surface, &ss_rect, ss_surface, NULL);

    if (ss_size == 0) {
        ss_size = ss_h;
        ss_rows = (unsigned char **)malloc(sizeof(unsigned char *) * ss_size);
        if (ss_rows == NULL)
            return -1;
    }
#if IS_SDLv1
    if (surf_flags & SDL_SRCALPHA)
        SDL_SetAlpha(surface, SDL_SRCALPHA, (Uint8)surf_alpha);
    if (surf_flags & SDL_SRCCOLORKEY)
        SDL_SetColorKey(surface, SDL_SRCCOLORKEY, surf_colorkey);
#else  /* IS_SDLv2 */
    if (has_colorkey)
        SDL_SetColorKey(surface, SDL_TRUE, surf_colorkey);
    SDL_SetSurfaceAlphaMod(surface, surf_alpha);
    SDL_SetSurfaceBlendMode(surface, surf_mode);
#endif /* IS_SDLv2 */

    for (i = 0; i < ss_h; i++) {
        ss_rows[i] =
            ((unsigned char *)ss_surface->pixels) + i * ss_surface->pitch;
    }

    if (alpha) {
        r = write_png(file, ss_rows, surface->w, surface->h,
                      PNG_COLOR_TYPE_RGB_ALPHA, 8);
    }
    else {
        r = write_png(file, ss_rows, surface->w, surface->h,
                      PNG_COLOR_TYPE_RGB, 8);
    }

    free(ss_rows);
    SDL_FreeSurface(ss_surface);
    ss_surface = NULL;
    return r;
}

#endif /* end if PNG_H */

#ifdef JPEGLIB_H

#define NUM_LINES_TO_WRITE 500

/* Avoid conflicts with the libjpeg libraries C runtime bindings.
 * Adapted from code in the libjpeg file jdatadst.c .
 */

#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */

/* Expanded data destination object for stdio output */
typedef struct {
    struct jpeg_destination_mgr pub; /* public fields */

    SDL_RWops *outfile;  /* target stream */
    JOCTET *buffer; /* start of buffer */
} j_outfile_mgr;

static void
j_init_destination(j_compress_ptr cinfo)
{
    j_outfile_mgr *dest = (j_outfile_mgr *)cinfo->dest;

    /* Allocate the output buffer --- it will be released when done with image
     */
    dest->buffer = (JOCTET *)(*cinfo->mem->alloc_small)(
        (j_common_ptr)cinfo, JPOOL_IMAGE, OUTPUT_BUF_SIZE * sizeof(JOCTET));

    dest->pub.next_output_byte = dest->buffer;
    dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
}

static boolean
j_empty_output_buffer(j_compress_ptr cinfo)
{
    j_outfile_mgr *dest = (j_outfile_mgr *)cinfo->dest;

    if (SDL_RWwrite(dest->outfile, dest->buffer, 1, OUTPUT_BUF_SIZE) !=
        (size_t)OUTPUT_BUF_SIZE) {
        ERREXIT(cinfo, JERR_FILE_WRITE);
    }
    dest->pub.next_output_byte = dest->buffer;
    dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;

    return 1;
}

static void
j_term_destination(j_compress_ptr cinfo)
{
    j_outfile_mgr *dest = (j_outfile_mgr *)cinfo->dest;
    size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;

    /* Write any data remaining in the buffer */
    if (datacount > 0) {
        if (SDL_RWwrite(dest->outfile, dest->buffer, 1, datacount) != datacount) {
            ERREXIT(cinfo, JERR_FILE_WRITE);
        }
    }
    /* TODO: add SDL_RWflush() when it exists */
}

static void
j_stdio_dest(j_compress_ptr cinfo, SDL_RWops *outfile)
{
    j_outfile_mgr *dest;

    /* The destination object is made permanent so that multiple JPEG images
     * can be written to the same file without re-executing jpeg_stdio_dest.
     * This makes it dangerous to use this manager and a different destination
     * manager serially with the same JPEG object, because their private object
     * sizes may be different.  Caveat programmer.
     */
    if (cinfo->dest == NULL) { /* first time for this JPEG object? */
        cinfo->dest =
            (struct jpeg_destination_mgr *)(*cinfo->mem->alloc_small)(
                (j_common_ptr)cinfo, JPOOL_PERMANENT, sizeof(j_outfile_mgr));
    }

    dest = (j_outfile_mgr *)cinfo->dest;
    dest->pub.init_destination = j_init_destination;
    dest->pub.empty_output_buffer = j_empty_output_buffer;
    dest->pub.term_destination = j_term_destination;
    dest->outfile = outfile;
}

/* End borrowed code
 */

int
write_jpeg(const char *file_name, unsigned char **image_buffer,
           int image_width, int image_height, int quality)
{
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr jerr;
    SDL_RWops *outfile;
    JSAMPROW row_pointer[NUM_LINES_TO_WRITE];
    int num_lines_to_write;
    int i;

    num_lines_to_write = NUM_LINES_TO_WRITE;

    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_compress(&cinfo);

    if (!(outfile = SDL_RWFromFile(file_name, "wb"))) {
        return -1;
    }
    j_stdio_dest(&cinfo, outfile);

    cinfo.image_width = image_width;
    cinfo.image_height = image_height;
    cinfo.input_components = 3;
    cinfo.in_color_space = JCS_RGB;
    /* cinfo.optimize_coding = FALSE;
     */
    /* cinfo.optimize_coding = FALSE;
     */

    jpeg_set_defaults(&cinfo);
    jpeg_set_quality(&cinfo, quality, 1);

    jpeg_start_compress(&cinfo, 1);

    /* try and write many scanlines at once.  */
    while (cinfo.next_scanline < cinfo.image_height) {
        if (num_lines_to_write >
            (cinfo.image_height - cinfo.next_scanline) - 1) {
            num_lines_to_write = (cinfo.image_height - cinfo.next_scanline);
        }
        /* copy the memory from the buffers */
        for (i = 0; i < num_lines_to_write; i++) {
            row_pointer[i] = image_buffer[cinfo.next_scanline + i];
        }

        jpeg_write_scanlines(&cinfo, row_pointer, num_lines_to_write);
    }

    jpeg_finish_compress(&cinfo);
    SDL_RWclose(outfile);
    jpeg_destroy_compress(&cinfo);
    return 0;
}

int
SaveJPEG(SDL_Surface *surface, const char *file)
{
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
#define RED_MASK 0xff0000
#define GREEN_MASK 0xff00
#define BLUE_MASK 0xff
#else
#define RED_MASK 0xff
#define GREEN_MASK 0xff00
#define BLUE_MASK 0xff0000
#endif

    static unsigned char **ss_rows;
    static int ss_size;
    static int ss_w, ss_h;
    SDL_Surface *ss_surface;
    SDL_Rect ss_rect;
    int r, i;
    int pixel_bits = 32;
    int free_ss_surface = 1;

    ss_rows = 0;
    ss_size = 0;
    ss_surface = NULL;

    ss_w = surface->w;
    ss_h = surface->h;

    pixel_bits = 24;

    if (!surface) {
        return -1;
    }

    /* See if the Surface is suitable for using directly.
       So no conversion is needed.  24bit, RGB
    */

#if IS_SDLv1
    if ((surface->format->BytesPerPixel == 3) &&
        !(surface->flags & SDL_SRCALPHA) &&
        (surface->format->Rmask == RED_MASK)) {
        /*
           printf("not creating...\n");
        */
        ss_surface = surface;

        free_ss_surface = 0;
    }
#else  /* IS_SDLv2 */
    if (surface->format->format == SDL_PIXELFORMAT_RGB24) {
        /*
           printf("not creating...\n");
        */
        ss_surface = surface;

        free_ss_surface = 0;
    }
#endif /* IS_SDLv2 */
    else {
        /*
        printf("creating...\n");
        */

        /* If it is not, then we need to make a new surface.
         */

#if IS_SDLv1
        ss_surface =
            SDL_CreateRGBSurface(SDL_SWSURFACE, ss_w, ss_h, pixel_bits,
                                 RED_MASK, GREEN_MASK, BLUE_MASK, 0);
#else  /* IS_SDLv2 */
        ss_surface = SDL_CreateRGBSurface(0, ss_w, ss_h, pixel_bits, RED_MASK,
                                          GREEN_MASK, BLUE_MASK, 0);
#endif /* IS_SDLv2 */
        if (ss_surface == NULL) {
            return -1;
        }

        ss_rect.x = 0;
        ss_rect.y = 0;
        ss_rect.w = ss_w;
        ss_rect.h = ss_h;
        SDL_BlitSurface(surface, &ss_rect, ss_surface, NULL);

        free_ss_surface = 1;
    }

    ss_size = ss_h;
    ss_rows = (unsigned char **)malloc(sizeof(unsigned char *) * ss_size);
    if (ss_rows == NULL) {
        /* clean up the allocated surface too */
        if (free_ss_surface) {
            SDL_FreeSurface(ss_surface);
        }
        return -1;
    }

    /* copy pointers to the scanlines... since they might not be packed.
     */
    for (i = 0; i < ss_h; i++) {
        ss_rows[i] =
            ((unsigned char *)ss_surface->pixels) + i * ss_surface->pitch;
    }
    r = write_jpeg(file, ss_rows, surface->w, surface->h, JPEG_QUALITY);

    free(ss_rows);

    if (free_ss_surface) {
        SDL_FreeSurface(ss_surface);
        ss_surface = NULL;
    }
    return r;
}

#endif /* end if JPEGLIB_H */

#if IS_SDLv1
/* NOTE XX HACK TODO FIXME: this opengltosdl is also in image.c
   need to share it between both.
*/

static SDL_Surface *
opengltosdl(void)
{
    /*we need to get ahold of the pyopengl glReadPixels function*/
    /*we use pyopengl's so we don't need to link with opengl at compiletime*/
    SDL_Surface *surf = NULL;
    Uint32 rmask, gmask, bmask;
    int i;
    unsigned char *pixels = NULL;

    GL_glReadPixels_Func p_glReadPixels = NULL;

    p_glReadPixels =
        (GL_glReadPixels_Func)SDL_GL_GetProcAddress("glReadPixels");

    surf = SDL_GetVideoSurface();

    if (!surf) {
        RAISE(PyExc_RuntimeError, "Cannot get video surface.");
        return NULL;
    }
    if (!p_glReadPixels) {
        RAISE(PyExc_RuntimeError, "Cannot find glReadPixels function.");
        return NULL;
    }

    pixels = (unsigned char *)malloc(surf->w * surf->h * 3);

    if (!pixels) {
        RAISE(PyExc_MemoryError, "Cannot allocate enough memory for pixels.");
        return NULL;
    }

    /* GL_RGB, GL_UNSIGNED_BYTE */
    p_glReadPixels(0, 0, surf->w, surf->h, 0x1907, 0x1401, pixels);

    if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {
        rmask = 0x000000FF;
        gmask = 0x0000FF00;
        bmask = 0x00FF0000;
    }
    else {
        rmask = 0x00FF0000;
        gmask = 0x0000FF00;
        bmask = 0x000000FF;
    }
    surf = SDL_CreateRGBSurface(SDL_SWSURFACE, surf->w, surf->h, 24, rmask,
                                gmask, bmask, 0);
    if (!surf) {
        free(pixels);
        RAISE(pgExc_SDLError, SDL_GetError());
        return NULL;
    }

    for (i = 0; i < surf->h; ++i) {
        memcpy(((char *)surf->pixels) + surf->pitch * i,
               pixels + 3 * surf->w * (surf->h - i - 1), surf->w * 3);
    }

    free(pixels);
    return surf;
}

#endif /* IS_SDLv1 */

static PyObject *
image_save_ext(PyObject *self, PyObject *arg)
{
    PyObject *surfobj;
    PyObject *obj;
    PyObject *oencoded = NULL;
    SDL_Surface *surf;
    SDL_Surface *temp = NULL;
    int result = 1;

    if (!PyArg_ParseTuple(arg, "O!O", &pgSurface_Type, &surfobj, &obj)) {
        return NULL;
    }

    surf = pgSurface_AsSurface(surfobj);
#if IS_SDLv1
    if (surf->flags & SDL_OPENGL) {
        temp = surf = opengltosdl();
        if (surf == NULL) {
            return NULL;
        }
    }
    else {
        pgSurface_Prep(surfobj);
    }
#else  /* IS_SDLv2 */
    pgSurface_Prep(surfobj);
#endif /* IS_SDLv2 */

    oencoded = pg_EncodeString(obj, "UTF-8", NULL, pgExc_SDLError);
    if (oencoded == Py_None) {
        PyErr_Format(PyExc_TypeError,
                     "Expected a string for the file argument: got %.1024s",
                     Py_TYPE(obj)->tp_name);
        result = -2;
    }
    else if (oencoded != NULL) {
        const char *name = Bytes_AS_STRING(oencoded);
        Py_ssize_t namelen = Bytes_GET_SIZE(oencoded);

        if ((namelen >= 4) &&
            (((name[namelen - 1] == 'g' || name[namelen - 1] == 'G') &&
              (name[namelen - 2] == 'e' || name[namelen - 2] == 'E') &&
              (name[namelen - 3] == 'p' || name[namelen - 3] == 'P') &&
              (name[namelen - 4] == 'j' || name[namelen - 4] == 'J')) ||
             ((name[namelen - 1] == 'g' || name[namelen - 1] == 'G') &&
              (name[namelen - 2] == 'p' || name[namelen - 2] == 'P') &&
              (name[namelen - 3] == 'j' || name[namelen - 3] == 'J')))) {
#ifdef JPEGLIB_H
            /* jpg save functions seem *NOT* thread safe at least on windows.
             */
            /*
            Py_BEGIN_ALLOW_THREADS;
            */
            result = SaveJPEG(surf, name);
            /*
            Py_END_ALLOW_THREADS;
            */
#else
            RAISE(pgExc_SDLError, "No support for jpg compiled in.");
            result = -2;
#endif /* ~JPEGLIB_H */
        }
        else if ((namelen >= 3) &&
                 ((name[namelen - 1] == 'g' || name[namelen - 1] == 'G') &&
                  (name[namelen - 2] == 'n' || name[namelen - 2] == 'N') &&
                  (name[namelen - 3] == 'p' || name[namelen - 3] == 'P'))) {
#ifdef PNG_H
            /*Py_BEGIN_ALLOW_THREADS; */
            result = SavePNG(surf, name);
            /*Py_END_ALLOW_THREADS; */
#else
            RAISE(pgExc_SDLError, "No support for png compiled in.");
            result = -2;
#endif /* ~PNG_H */
        }
    }
    else {
        result = -2;
    }

    if (temp != NULL) {
        SDL_FreeSurface(temp);
    }
    else {
        pgSurface_Unprep(surfobj);
    }

    Py_XDECREF(oencoded);
    if (result == -2) {
        /* Python error raised elsewhere */
        return NULL;
    }
    if (result == -1) {
        /* SDL error: translate to Python error */
        return RAISE(pgExc_SDLError, SDL_GetError());
    }
    if (result == 1) {
        return RAISE(pgExc_SDLError, "Unrecognized image type");
    }

    Py_RETURN_NONE;
}

#ifdef WITH_THREAD
#if PY3
static void
_imageext_free(void *ptr)
{
    if (_pg_img_mutex) {
        SDL_DestroyMutex(_pg_img_mutex);
        _pg_img_mutex = 0;
    }
}
#else /* PY2 */
static void
_imageext_free(void)
{
    if (_pg_img_mutex) {
        SDL_DestroyMutex(_pg_img_mutex);
        _pg_img_mutex = 0;
    }
}
#endif /* PY2 */
#endif /* WITH_THREAD */

static PyMethodDef _imageext_methods[] = {
    {"load_extended", image_load_ext, METH_VARARGS, DOC_PYGAMEIMAGE},
    {"save_extended", image_save_ext, METH_VARARGS, DOC_PYGAMEIMAGE},
    {NULL, NULL, 0, NULL}};

/*DOC*/ static char _imageext_doc[] =
    /*DOC*/ "additional image loaders";

MODINIT_DEFINE(imageext)
{
#if PY3
    static struct PyModuleDef _module = {PyModuleDef_HEAD_INIT,
                                         "imageext",
                                         _imageext_doc,
                                         -1,
                                         _imageext_methods,
                                         NULL,
                                         NULL,
                                         NULL,
#ifdef WITH_THREAD
                                         _imageext_free};
#else /* ~WITH_THREAD */
                                         0};
#endif /* ~WITH_THREAD */
#endif

    /* imported needed apis; Do this first so if there is an error
       the module is not loaded.
    */
    import_pygame_base();
    if (PyErr_Occurred()) {
        MODINIT_ERROR;
    }
    import_pygame_surface();
    if (PyErr_Occurred()) {
        MODINIT_ERROR;
    }
    import_pygame_rwobject();

    if (PyErr_Occurred()) {
        MODINIT_ERROR;
    }

#ifdef WITH_THREAD
#if PY2
    if (Py_AtExit(_imageext_free)) {
        MODINIT_ERROR;
    }
#endif /* PY2 */
    _pg_img_mutex = SDL_CreateMutex();
    if (!_pg_img_mutex) {
        PyErr_SetString(pgExc_SDLError, SDL_GetError());
        MODINIT_ERROR;
    }
#endif /* WITH_THREAD */

    /* create the module */
#if PY3
    return PyModule_Create(&_module);
#else
    Py_InitModule3(MODPREFIX "imageext", _imageext_methods, _imageext_doc);
#endif
}