/* Load a PNG file from disk, doing colour coversion if required.
*/
ALLEGRO_BITMAP *_al_load_png_f(ALLEGRO_FILE *fp, int flags)
{
jmp_buf jmpbuf;
ALLEGRO_BITMAP *bmp;
png_structp png_ptr;
png_infop info_ptr;
ALLEGRO_ASSERT(fp);
if (!check_if_png(fp)) {
ALLEGRO_ERROR("Not a png.\n");
return NULL;
}
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also supply the
* the compiler header file version, so that we know if the application
* was compiled with a compatible version of the library.
*/
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
(void *)NULL, NULL, NULL);
if (!png_ptr) {
ALLEGRO_ERROR("png_ptr == NULL\n");
return NULL;
}
/* Allocate/initialize the memory for image information. */
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, (png_infopp) NULL, (png_infopp) NULL);
ALLEGRO_ERROR("png_create_info_struct failed\n");
return NULL;
}
/* Set error handling. */
if (setjmp(jmpbuf)) {
/* Free all of the memory associated with the png_ptr and info_ptr */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
/* If we get here, we had a problem reading the file */
ALLEGRO_ERROR("Error reading PNG file\n");
return NULL;
}
png_set_error_fn(png_ptr, jmpbuf, user_error_fn, NULL);
/* Use Allegro packfile routines. */
png_set_read_fn(png_ptr, fp, (png_rw_ptr) read_data);
/* We have already read some of the signature. */
png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK);
/* Really load the image now. */
bmp = really_load_png(png_ptr, info_ptr, flags);
/* Clean up after the read, and free any memory allocated. */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
return bmp;
}
unicap_status_t ucil_load_png( char *filename, unicap_data_buffer_t *buffer )
{
FILE *f;
if( !check_if_png( filename, &f ) )
{
TRACE( "File '%s' is not a valid PNG image\n", filename );
return STATUS_FAILURE;
}
if( read_png( f, PNG_BYTES_TO_CHECK, buffer ) < 0 )
{
TRACE( "File '%s' could not be loaded\n", filename );
return STATUS_FAILURE;
}
return STATUS_SUCCESS;
}
