/*
====================
PNG_OpenLibrary
Try to load the PNG DLL
====================
*/
qboolean PNG_OpenLibrary (void)
{
#ifndef LINK_TO_LIBPNG
const char* dllnames [] =
{
#if WIN32
"libpng16.dll",
"libpng16-16.dll",
"libpng15-15.dll",
"libpng15.dll",
"libpng14-14.dll",
"libpng14.dll",
"libpng12.dll",
#elif defined(MACOSX)
"libpng16.16.dylib",
"libpng15.15.dylib",
"libpng14.14.dylib",
"libpng12.0.dylib",
#else
"libpng16.so",
"libpng16.so.16",
"libpng15.so.15", // WTF libtool guidelines anyone?
"libpng14.so.14", // WTF libtool guidelines anyone?
"libpng12.so.0",
"libpng.so", // FreeBSD
#endif
NULL
};
// Already loaded?
if (png_dll)
return true;
// Load the DLL
if(!Sys_LoadLibrary (dllnames, &png_dll, pngfuncs))
return false;
if(qpng_access_version_number() / 100 >= 104)
if(!Sys_LoadLibrary (dllnames, &png14_dll, png14funcs))
{
Sys_UnloadLibrary (&png_dll);
return false;
}
#endif
return true;
}
unsigned char *PNG_LoadImage_BGRA (const unsigned char *raw, int filesize, int *miplevel)
{
unsigned int c;
unsigned int y;
void *png, *pnginfo;
unsigned char *imagedata = NULL;
unsigned char ioBuffer[8192];
// FIXME: register an error handler so that abort() won't be called on error
// No DLL = no PNGs
if (!png_dll)
return NULL;
if(qpng_sig_cmp(raw, 0, filesize))
return NULL;
png = (void *)qpng_create_read_struct(
(qpng_access_version_number() / 100 == 102) ? PNG_LIBPNG_VER_STRING_12 :
(qpng_access_version_number() / 100 == 104) ? PNG_LIBPNG_VER_STRING_14 :
PNG_LIBPNG_VER_STRING_15, // nasty hack... whatever
0, PNG_error_fn, PNG_warning_fn
);
if(!png)
return NULL;
// this must be memset before the setjmp error handler, because it relies
// on the fields in this struct for cleanup
memset(&my_png, 0, sizeof(my_png));
// NOTE: this relies on jmp_buf being the first thing in the png structure
// created by libpng! (this is correct for libpng 1.2.x)
if (setjmp(qpng_jmpbuf(png)))
{
if (my_png.Data)
Mem_Free(my_png.Data);
my_png.Data = NULL;
if (my_png.FRowPtrs)
Mem_Free(my_png.FRowPtrs);
my_png.FRowPtrs = NULL;
qpng_destroy_read_struct(&png, &pnginfo, 0);
return NULL;
}
//
pnginfo = qpng_create_info_struct(png);
if(!pnginfo)
{
qpng_destroy_read_struct(&png, &pnginfo, 0);
return NULL;
}
qpng_set_sig_bytes(png, 0);
my_png.tmpBuf = raw;
my_png.tmpBuflength = filesize;
my_png.tmpi = 0;
//my_png.Data = NULL;
//my_png.FRowPtrs = NULL;
//my_png.Height = 0;
//my_png.Width = 0;
my_png.ColorType = PNG_COLOR_TYPE_RGB;
//my_png.Interlace = 0;
//my_png.Compression = 0;
//my_png.Filter = 0;
qpng_set_read_fn(png, ioBuffer, PNG_fReadData);
qpng_read_info(png, pnginfo);
qpng_get_IHDR(png, pnginfo, &my_png.Width, &my_png.Height,&my_png.BitDepth, &my_png.ColorType, &my_png.Interlace, &my_png.Compression, &my_png.Filter);
// this check guards against pngconf.h with unsigned int *width/height parameters on big endian systems by detecting the strange values and shifting them down 32bits
// (if it's little endian the unwritten bytes are the most significant
// ones and we don't worry about that)
//
// this is only necessary because of retarded 64bit png_uint_32 types in libpng 1.2, which can (conceivably) vary by platform
#if LONG_MAX > 4000000000
if (my_png.Width > LONG_MAX || my_png.Height > LONG_MAX)
{
my_png.Width >>= 32;
my_png.Height >>= 32;
}