pygame / src / imageext.c

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/*
  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 <png.h>
#include <jpeglib.h>
/* 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
#include "pygame.h"
#include "pygamedocs.h"
#include "pgopengl.h"
#include <SDL_image.h>

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

    if (!fullname)
        return NULL;

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

static PyObject*
image_load_ext (PyObject* self, PyObject* arg)
{
    PyObject* file, *final;
    char* name = NULL;
    SDL_Surface* surf;
    SDL_RWops *rw;
    if (!PyArg_ParseTuple (arg, "O|s", &file, &name))
        return NULL;
    if (PyString_Check (file) || PyUnicode_Check (file))
    {
        if (!PyArg_ParseTuple (arg, "s|O", &name, &file))
            return NULL;
        Py_BEGIN_ALLOW_THREADS;
        surf = IMG_Load (name);
        Py_END_ALLOW_THREADS;
    }
    else
    {
        if (!name && PyFile_Check (file))
            name = PyString_AsString (PyFile_Name (file));
        if (!(rw = RWopsFromPython (file)))
            return NULL;
        if (RWopsCheckPython (rw))
        {
            surf = IMG_LoadTyped_RW (rw, 1, find_extension (name));
        }
        else
        {
            Py_BEGIN_ALLOW_THREADS;
            surf = IMG_LoadTyped_RW (rw, 1, find_extension (name));
            Py_END_ALLOW_THREADS;
        }
    }

    if (!surf)
        return RAISE (PyExc_SDLError, IMG_GetError ());
    final = PySurface_New (surf);
    if (!final)
        SDL_FreeSurface (surf);
    return final;
}

#ifdef PNG_H

static int
write_png (char *file_name, png_bytep *rows, int w, int h, int colortype,
           int bitdepth)
{
    png_structp png_ptr;
    png_infop info_ptr;
    FILE *fp = NULL;
    char *doing = "open for writing";

    if (!(fp = fopen (file_name, "wb")))
        goto fail;

    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_init_io (png_ptr, fp);

    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 != fclose (fp))
        goto fail;
    return 0;

fail:
    SDL_SetError ("SavePNG: could not %s", doing);
    return -1;
}

static int
SavePNG (SDL_Surface *surface, 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;
    int pixel_bits = 32;

    unsigned surf_flags;
    unsigned surf_alpha;

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

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

    if (surface->format->Amask)
    {
        alpha = 1;
        pixel_bits = 32;
    }
    else
        pixel_bits = 24;

    ss_surface = SDL_CreateRGBSurface (SDL_SWSURFACE|SDL_SRCALPHA,
                                       ss_w, ss_h, pixel_bits,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
                                       0xff0000, 0xff00, 0xff, 0x000000ff
#else
                                       0xff, 0xff00, 0xff0000, 0xff000000
#endif
        );

    if (ss_surface == NULL)
        return -1;

    surf_flags = surface->flags & (SDL_SRCALPHA | SDL_SRCCOLORKEY);
    surf_alpha = surface->format->alpha;
    if (surf_flags & SDL_SRCALPHA)
        SDL_SetAlpha (surface, 0, 255);
    if (surf_flags & SDL_SRCCOLORKEY)
        SDL_SetColorKey (surface, 0, surface->format->colorkey);

    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 (surf_flags & SDL_SRCALPHA)
        SDL_SetAlpha (surface, SDL_SRCALPHA, (Uint8)surf_alpha);
    if (surf_flags & SDL_SRCCOLORKEY)
        SDL_SetColorKey (surface, SDL_SRCCOLORKEY, surface->format->colorkey);

    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

static int
write_jpeg (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;
    FILE * outfile;
    JSAMPROW row_pointer[1];
    int row_stride;

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

    if ((outfile = fopen (file_name, "wb")) == NULL)
    {
        SDL_SetError ("SaveJPEG: could not open %s", file_name);
        return -1;
    }
    jpeg_stdio_dest (&cinfo, outfile);

    cinfo.image_width = image_width;
    cinfo.image_height = image_height;
    cinfo.input_components = 3;
    cinfo.in_color_space = JCS_RGB;

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

    jpeg_start_compress (&cinfo, TRUE);
    row_stride = image_width * 3;

    while (cinfo.next_scanline < cinfo.image_height)
    {
        row_pointer[0] = image_buffer[cinfo.next_scanline];
        (void) jpeg_write_scanlines (&cinfo, row_pointer, 1);
    }

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

static int
SaveJPEG (SDL_Surface *surface, 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;
    int pixel_bits = 32;

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

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

    alpha = 0;
    pixel_bits = 24;

    ss_surface = SDL_CreateRGBSurface (SDL_SWSURFACE|SDL_SRCALPHA,
                                       ss_w, ss_h, pixel_bits,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
                                       0xff0000, 0xff00, 0xff, 0x000000ff
#else
                                       0xff, 0xff00, 0xff0000, 0xff000000
#endif
        );

    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);


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


    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, 85);


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

#endif /* end if JPEGLIB_H */

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


static SDL_Surface*
opengltosdl ()
{
    /*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 (PyExc_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;
}


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

    if (!PyArg_ParseTuple (arg, "O!O", &PySurface_Type, &surfobj, &file))
        return NULL;
    surf = PySurface_AsSurface (surfobj);

    if (surf->flags & SDL_OPENGL)
    {
        temp = surf = opengltosdl ();
        if (!surf)
            return NULL;
    }
    else
        PySurface_Prep (surfobj);

    if (PyString_Check (file) || PyUnicode_Check (file))
    {
        int namelen;
        char* name;
        if (!PyArg_ParseTuple (arg, "O|s", &file, &name))
            return NULL;
        namelen = strlen (name);
        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
            /* Png, and jpg save functions are not thread safe. */
            /*Py_BEGIN_ALLOW_THREADS; */
            result = SaveJPEG (surf, name);
            /*Py_END_ALLOW_THREADS; */
#else
            return RAISE (PyExc_SDLError, "No support for jpg compiled in.");
#endif

        }
        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
            return RAISE (PyExc_SDLError, "No support for png compiled in.");
#endif
        }

        else
            result = -1;
    }
    else
        return NULL;

    if(temp)
        SDL_FreeSurface (temp);
    else
        PySurface_Unprep (surfobj);

    if (result == -1)
        return RAISE (PyExc_SDLError, SDL_GetError ());

    Py_RETURN_NONE;
}

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

PYGAME_EXPORT
void initimageext (void)
{
    /* create the module */
    Py_InitModule3 ("imageext", image_builtins, NULL);

    /*imported needed apis*/
    import_pygame_base ();
    import_pygame_surface ();
    import_pygame_rwobject ();
}
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